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Non-enzymatic colorimetric sensor for cardiac Troponin I (cTnI) based on self-assembly of gold nanorods on heparin Gold Bull. (IF 1.706) Pub Date : 2021-01-12 Vidya Raj, Saji Alex
The paper reports a simple enzyme-free colorimetric sensor for the detection of cardiac marker, Troponin I (cTnI) based on the self-assembly of gold nanorods (AuNRs) on heparin. The sensing system consists of a purple colour solution of Hexadecyltrimethylammonium bromide (CTAB) stabilised AuNRs self-assembled in presence of heparin due to the electrostatic interaction resulting in the reduction of
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Conjugated anisotropic gold nanoparticles through pterin derivatives for a selective plasmonic photothermal therapy: in vitro studies in HeLa and normal human endocervical cells Gold Bull. (IF 1.706) Pub Date : 2021-01-06 Diana Blach, Carlos E. Alves De Souza, Stelia C. Méndez, Fernando O. Martínez
This article reports a simple one-step method for anisotropic gold nanoparticle synthesis for plasmonic photothermal therapy medical purposes, using 1,4-bis[(2-ethylhexyl) oxy]-1,4-dioxo-2-butanesulfonic acid-sodium (AOT) reverse micelles as nanoreactor, where under specific condition, AOT acts as both a reducing and stabilizing agent. Obtained AuNPs were functionalized by attaching compounds derived
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Gold’s red shift: colorimetry of multiple reflections in grooves Gold Bull. (IF 1.706) Pub Date : 2020-11-18 Arnaud Manas
The color of fine gold shows paradoxical variations that have tentatively been explained by metallurgic factors. Measurements and digital photographs show a significantly redder color than predicted by theory. A novel purely optical explanation based on the multiple reflection in grooves is suggested. The analysis in the colorimetric space RGB of the photographs of several fine gold samples and coins
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Gold nanorods as colorimetric probes for naked-eye recognition of carnitine enantiomers Gold Bull. (IF 1.706) Pub Date : 2020-11-10 Yanwei Wang, Xiaojuan Zhou, Qiang Liu, Yan Jin, Chunli Xu, Baoxin Li
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Photocurrent enhancement estimation of P3HT:PCBM:Au films as a function of gold nanoparticles concentration Gold Bull. (IF 1.706) Pub Date : 2020-10-13 D. Canto-Reyes, R. A. Soberanis-Ortiz, I. Riech, J. A. Mendez-Gamboa, M. Acosta
This report provides a method to estimate how much the photocurrents can be increased by adding gold nanoparticles in P3HT:PCBM films, without having to carry out the complex process of fabricate a whole cell. The tuning effect of varying the gold nanoparticle concentration on optical properties of these films was analyzed by measuring optical absorption. To estimate the contribution of the optical
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Novel synthesis of polycationic gold nanoparticles and their potential for microbial optical sensing Gold Bull. (IF 1.706) Pub Date : 2020-10-12 Ravichandran Manisekaran, Edgar Jiménez-Cervantes Amieva, Carlos M. Valdemar-Aguilar, Luz M. López-Marín
The aim of this research was to describe a facile protocol to obtain biocompatible gold nanoparticles (AuNPs) suitable for microbial optical sensing. For this purpose, polycationic poly-L-lysine (PLL) was employed as both reducing and stabilizing agent in order to obtain an optically active microbial nanotag based on the electrostatic interaction with negatively charged cell envelopes. A one-pot procedure
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Correction to: The effect of ultrasound hyperthermia with gold nanoparticles on retinoblastoma Y79 cells Gold Bull. (IF 1.706) Pub Date : 2020-06-04 Somayeh Moradi, Manijhe Mokhtari-Dizaji, Fariba Ghassemi, Shahab Sheibani, Fahimeh Asadi Amoli
The publication of this article unfortunately contained a mistake.
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Laser-assisted generation of elongated Au nanoparticles in aqueous solutions of divalent ions Gold Bull. (IF 1.706) Pub Date : 2020-06-04 M. I. Zhilnikova, E. V. Barmina, G. A. Shafeev, S. M. Pridvorova, O. V. Uvarov
One-step laser-assisted fabrication of elongated Au nanoparticles (NPs) and their subsequent fragmentation and agglomeration are experimentally studied. The generation of elongated Au NPs is carried out via laser ablation of a solid Au target in water using an ytterbium-doped fiber laser source with pulse duration of 200 ns and pulse energy of 1 mJ. Extinction spectrum of the resulting particles exhibits
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A causal study on gold, SENSEX, and gold exchange traded funds Gold Bull. (IF 1.706) Pub Date : 2020-05-16 Rajit Verma; Dinky Dhiman
Gold exchange traded funds help investors to generate the returns based on the movements of underlying commodity. In current scenario, gold ETFs are emerging as one of the best ETFs for the investments. The present study intended to determine the causal relationship between spot prices of gold, SENSEX, and ten selected BSE listed Gold ETFs. The closing prices gold ETFs, SENSEX and spot prices of gold
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The effect of ultrasound hyperthermia with gold nanoparticles on retinoblastoma Y79 cells Gold Bull. (IF 1.706) Pub Date : 2020-05-09 Somayeh Moradi; Manijeh Mokhtari-Dizaji; Fariba Ghassemi; Shahab Sheibani; Fahimeh Asadi Amoli
The purpose of this study was to evaluate the possible synergistic effect of gold nano-therapy (Au-NPs) on Y79 cells treated with ultrasonic hyperthermia. The cells in the presence and absence of gold nanoparticles were subjected to ultrasonic irradiation (3 MHz, 1 W/cm2, 40% pulse mode). Gold nanoparticles with an average diameter of 60 nm were synthesized. The cell viability of the Y79 cells was
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Agglomerates of Au-Pt bimetallic nanoparticles: synthesis and antibacterial activity Gold Bull. (IF 1.706) Pub Date : 2020-05-08 R. Britto Hurtado; M. Cortez-Valadez; N. S. Flores-Lopez; M. Flores-Acosta
The extraction of bimetallic Au-Pt nanoparticles is interesting due to their multiple applications in catalytic processes, electronic devices, photothermal therapies, among others. On the other hand, the tendency of nanoparticles forming agglomerates may modify the behavior of the material, and thus their applications. This study shows a highly reproducible novel synthesis method, which only uses two
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Brazing of CoCrFeNi and CoCrFeMnNi equiatomic alloys using 70Au-8Pd-22Ni filler foil Gold Bull. (IF 1.706) Pub Date : 2020-05-04 Chieh Lin; Ren-Kae Shiue; Shyi-Kaan Wu; Jian-Yuan Huang; Yung-Chien Huang
Brazing of CoCrFeNi and CoCrFeMnNi equiatomic alloys using 70Au-8Pd-22Ni (AuPdNi) filler foil by infrared and traditional furnaces was investigated. The wettability of AuPdNi filler on both CoCrFeNi and CoCrFeMnNi substrates is excellent at 1050 °C. CoCrFeNi/AuPdNi/CoCrFeNi joints brazed using infrared and traditional furnaces are composed of Au/Ni-rich solid solutions of different sizes. CoCrFeMn
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Gold-decorated sulfur-doped carbon nanotubes as electrocatalyst in hydrogen evolution reaction Gold Bull. (IF 1.706) Pub Date : 2020-05-02 Hossein Tavakol; Mohammad Zhiani; Fereshteh Shareifyan-ghahfarokhi
In the present work, sulfur-doped carbon nanotubes (SCNTs) have been prepared using chemical vapor deposition method and various cobalt-containing catalysts. In this line, simple and silica-supported cobalt nanoparticles (Co and Co/SiO2) and 5 cobalt spinels (MCo2O4, M = Ni, Cu, Mn, Fe, Cr, and Mg) were used as the growth catalysts and four different temperatures (600, 650, 700, and 750 °C) were used
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Characterization and preservation of gold oxides prepared by an oxygen-dc glow discharge from gold films and studied by X-ray photoelectron spectroscopy Gold Bull. (IF 1.706) Pub Date : 2020-04-15 Morihide Higo; Masaru Mitsushio; Toshifumi Yoshidome; Sadafumi Nakatake
Gold oxides with thicknesses of less than 1 nm that were prepared by an oxygen-dc glow discharge over various periods (0.5–10 min) from gold films at room temperature were characterized by X-ray photoelectron spectroscopy (XPS), and a preservation method was developed for these oxides. The O 1s spectra show three oxygen species comprising components I, II, and III in the gold oxides. Components I and
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Synthesis of amphiphilic Janus gold nanoparticles stabilized with triphenylphosphine and D-penicillamine by ligand exchange at toluene/water emulsion interface Gold Bull. (IF 1.706) Pub Date : 2020-03-14 Degui Li; Yujia Luo; Jiaxin Lan; Zhihong Luo; Fujie Li; Kun Luo
Ligand exchange was triggered at toluene/water emulsion interface between homogeneous gold nanoparticles (Au NPs) with triphenylphosphine (PPh3) and D-penicillamine (D-PA), resulted in amphiphilic Janus Au NPs with both phosphine and thiolate ligands. TEM and XRD analyses indicate that the product is composed of Au nanocrystals in an average diameter of about 3.7 nm. XPS, FTIR, Raman, and 1H NMR analyses
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A new route for developing highly efficient nano biochemical sensors for detecting ultra-low concentrations of tetracycline antibiotic residue in water Gold Bull. (IF 1.706) Pub Date : 2020-03-10 Alwan M. Alwan; Layla A. Wali; Khulood K. Hasan
This study reports a new detection process for sensing ultra-low concentrations of tetracycline (TC), using a hot spot surface-enhanced Raman scattering (SERS) sensor. A gold nanoparticles/ macroporous silicon (Au NPs/macroPSi) hot spot SERS sensor was fabricated using a very simple and low cost method. The SERS signal was investigated using Au NPs/macroPSi hot spot SERS sensor for efficient detection
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Probable daily return on investments in gold Gold Bull. (IF 1.706) Pub Date : 2020-03-10 Muhammad Shujaat Nawaz; Muhammad Azam; Muhammad Aslam
Gold, used for jewelry and ornaments at times, is now considered a safe metal for investment. In addition to buying and selling gold physically, some markets offer electronic trade in gold. Trade volume is on surge in these bullion markets with each passing day. Daily opening and closing gold prices are used for analysis for 7740 days. Data series of daily return on investment in gold is split into
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Characterization of gold nanoparticle thin film prepared by electrophoretic deposition method Gold Bull. (IF 1.706) Pub Date : 2020-01-25 Samira Hosseingholilou; Davoud Dorranian; Mahmood Ghoranneviss
Gold nanoparticle thin films were deposited on copper substrate using electrophoretic deposition (EPD) method. At first, gold nanoparticles were synthesized, using pulsed laser ablation method of a high-purity gold target in distilled water. Ablation was carried out, employing the fundamental wavelength of a Q-switched Nd:YAG laser at 1064 nm and pulse width of 7 ns. Suspension of gold nanoparticle
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Grain refinement of 24 karat gold (99.99 wt.% pure) and 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) by Au-6wt.%Ti grain refiner Gold Bull. (IF 1.706) Pub Date : 2020-01-23 K. M. Saradesh; G. S. Vinodkumar
In this paper, the 24 karat (99.99 wt.% pure) and 22 karat gold (Au-5.8wt.%Cu-2.5wt.%Ag) were grain refined with Au-6wt.%Ti master alloy and the mechanism of grain refinement was studied. The Au-6wt.%Ti master alloy containing Au2Ti and Au4Ti intermetallic particles was added into 24 karat and 22 karat gold at various addition levels of Ti (0.1, 0.2 and 0.3 wt.%) for grain refinement. The intermetallic
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Novel approach for selective recovery of gold, copper, and iron as marketable product from industrial effluent Gold Bull. (IF 1.706) Pub Date : 2020-01-22 Rekha Panda; Om Shankar Dinkar; Manis Kumar Jha; Devendra Deo Pathak
Globally, continuous R & D efforts are being made to recuperate precious metals from wastes in order to conserve the natural resources as well as minimize environmental pollution. Keeping in view of the above, a process has been developed to recover gold from industrial effluent using hydrometallurgical route. Initially, the effluent was pre-treated using precipitation and solvent extraction techniques
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Preparation and plasmon resonance properties of Au nanorods and Au nanorods @SiO 2 Gold Bull. (IF 1.706) Pub Date : 2020-01-22 Li-qing Meng; Hui-qin Li; Wei-wei Zhao; Zong-xiao Li; Chong Lin
Au nanorods were prepared through seed growth method. Their lengths and diameters were controlled by adjusting Ag+ content in the growth solution. Ethyl orthosilicate were hydrolyzed in alkali solutions to obtain SiO2-coated Au nanostructures. Au nanorods with ideal morphologies and sizes could only be obtained under the presence of a certain Ag+ concentration in the growth solution. Without Ag+, only
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Nitrate Reductase mediated synthesis of surface passivated nanogold as broad-spectrum antibacterial agent Gold Bull. (IF 1.706) Pub Date : 2019-11-21 Sneha Singh; Abhimanyu Dev; Archita Gupta; Vinod Kumar Nigam; Krishna Mohan Poluri
The green synthesis of gold nanoparticles has attracted tremendous interest owing to their unique physicochemical properties and widespread applications which are primarily size-dependent. The stability, less reaction time, and use of biological resources as novel nanofactories as an alternative to conventional synthesis strategies are the main objectives of green synthesis approaches. However, to
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Facile construction of calix[4]pyrrole-templated gold nanoparticles: computational insights and application for efficient reduction of 4-nitrophenol Gold Bull. (IF 1.706) Pub Date : 2019-11-15 Anita Kongor; Manthan Panchal; Mohd Athar; Keyur Bhatt; P. C. Jha; Vinod Jain
Herein, we report a simple one-pot synthesis of water-dispersible gold nanoparticles (AuNPs) by using meso-tetra(methyl) meso-tetra hydrazide-functionalized calix[4]pyrrole (ECPTH) as both reducing and stabilizing template. The characterization of ECPTH-AuNPs has been carried out by UV-Vis spectroscopy, transmission electron microscope, X-ray diffraction (XRD), dynamic light scattering (DLS), and zeta
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Study on the electrochemical behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti) Gold Bull. (IF 1.706) Pub Date : 2019-11-15 K. M. Saradesh; Indrajit Patil; D. Sivaprahasam; Bhalchandra Kakade; G. S. Vinodkumar
The electrochemical corrosion behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k (Ti-22k) gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti) was studied. Elemental Ti was added as the quaternary element to 22k gold by replacing Ag, resulting in the formation of secondary phase precipitates during age hardening treatment, thereby improving the hardness of the alloy. Anodic polarization tests
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A new nanocomposite optical sensor based on polyurethane foam and gold nanorods for solid-phase spectroscopic determination of catecholamines Gold Bull. (IF 1.706) Pub Date : 2019-11-14 Maria V. Gorbunova; Vladimir V. Apyari; Ivan I. Zolotov; Stanislava G. Dmitrienko; Alexey V. Garshev; Pavel A. Volkov; Vladimir E. Bochenkov
A new nanocomposite material based on gold nanorods and polyurethane foam was obtained, and a method for the determination of catecholamines with the use of this nanocomposite modified with silver nitrate was developed. The determination is based on the measuring hypsochromic shift of a short-wave surface plasmon resonance band in a diffuse reflection spectrum of the nanocomposite. This shift is caused
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Study of gold nanoparticle transport by M13 phages towards disease tissues as targeting procedure for radiotherapy applications Gold Bull. (IF 1.706) Pub Date : 2019-11-14 L. Torrisi; S. Guglielmino; L. Silipigni; L. M. De Plano; L. Kovacik; V. Lavrentiev; A. Torrisi; M. Fazio; B. Fazio; G. Di Marco
This work introduces an innovative new method to transport gold nanoparticles (Au-NPs) toward specific organs using as transporter the M13 filamentous phage. The aim is to improve the radiotherapy efficiency by injecting gold nanoparticles in the tumor tissues in order to increase the effective atomic number and, consequently, to produce higher locally deposited doses. The biocompatible Au-NPs can
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Mechanistic investigation of facilitated transport of gold(III) from HCl media using ionic liquid Cyphos IL102 as carrier across a supported liquid membrane Gold Bull. (IF 1.706) Pub Date : 2019-11-12 F. J. Alguacil
The transport of gold(III) across a supported liquid membrane containing the ionic liquid Cyphos IL102 (trihexyl(tetradecyl)phosphonium bromide) in Solvesso 100 has been investigated. The investigation was carried out under various experimental variables affecting to the transport process: stirring speed in the aqueous feed solution, HCl and gold(III) concentrations in this same phase, and carrier
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Enhancing the radiotherapeutic index of gamma radiation on cervical cancer cells by gold nanoparticles Gold Bull. (IF 1.706) Pub Date : 2019-06-08 Priya Yadav; Arghya Bandyopadhyay; Anindita Chakraborty; Sk. Manirul Islam; Keka Sarkar
Nanotechnology has the impending ability to improve the therapeutic potential of drugs and radiation-based treatment approaches for reducing cancerous cell death while curtailing collateral toxicity to non-cancerous cells. Among all metal nanomaterials, gold nanoparticles (AuNPs) are establishing themselves as an excellent radiosensitizer and serve as a multimodal modality due to their unique physicochemical
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Synthesis of gold nanoparticles supported at graphene derivatives using green reductants and evaluation of their catalytic activity in 4-nitrophenol reduction Gold Bull. (IF 1.706) Pub Date : 2019-06-01 Dong Hoon Choi; Jee Eun Hong; Yeonghun Jung; Hye In Park; Seung Tae Baek; Su Jeong Kim; Chan Gook Lee; Youmie Park; Seok Ju Park; Yohan Park
In this study, gold nanoparticles were supported at graphene derivatives (AuNPs@GDs) from chloroauric acid and graphene oxide (GO) by using sodium citrate, L-ascorbic acid, and 4-(2-hydroxyethyl)-1-piperazineethane-sulfonic acid (HEPES) as green reductants to evaluate the catalytic activity in the 4-nitrophenol (4-NP) reduction system. Among the three reductants, HEPES which derived AuNP@GD (3) exhibited
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Thermal stability of oxide-supported gold nanoparticles Gold Bull. (IF 1.706) Pub Date : 2019-05-16 Nazila Masoud; Tomas Partsch; Krijn P. de Jong; Petra E. de Jongh
In this study, we report on the influence of support and gas atmosphere on the thermal stability of Au nanoparticles on oxidic supports. All samples were prepared with a modified impregnation method and have initial Au particle sizes in the range of 3–4 nm. We observed that in air, Au nanoparticles on SiO2 and Al2O3 are thermally much more stable than Au nanoparticles on TiO2. For instance, upon treatment
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Horseradish peroxidase-AuNP/LDH heterostructures: influence on nanogold release and enzyme activity Gold Bull. (IF 1.706) Pub Date : 2019-05-08 Elena-Florentina Grosu; Renato Froidevaux; Gabriela Carja
Gold nanostructures (AuNP) are important as strong platforms for targeted therapeutic and diagnostic applications. Tireless effort has been devoted nowadays to explore the multifunctionality of AuNP in multicomponent biostructures. Herein, we report the fabrication of horseradish peroxidase enzyme (HRP)-AuNP/ZnAlLDH heterostructure by the facile synthesis of AuNP on the biocompatible matrices of layered
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Detoxification of gold surfaces by OH • treatment Gold Bull. (IF 1.706) Pub Date : 2019-05-07 Katja Vahl; Tyll Utesch; Ulrich Hasse; Heike Kahlert; Robert S. Jack; Andreas Bollmann; Klaus Lücke; Fritz Scholz
Metallic gold is not completely inert towards biological tissues and cells. Cytotoxicity and immunotoxicity are concerns in various gold applications. This study shows that treating the surface of gold with OH• radicals renders the gold surface non-cytotoxic, as well as prevents any biocorrosion of gold implants by an immune reaction. The detoxification is discussed as resulting from the selective
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Improvement of amperometric laccase biosensor using enzyme-immobilized gold nanoparticles coupling with ureasil polymer as a host matrix Gold Bull. (IF 1.706) Pub Date : 2019-05-07 T. Kavetskyy; N. Stasyuk; O. Smutok; O. Demkiv; Y. Kukhazh; N. Hoivanovych; V. Boev; V. Ilcheva; T. Petkova; M. Gonchar
Synthesis of gold nanoparticles (Au-NPs) was performed using method of an inorganic chemical reduction. The synthesized Au-NPs showed an intensive surface plasmon resonance band at 525 nm that is typical for corresponding Au-NPs reported in literature. The structural and morphology characterizations of the obtained Au-NPs were carried out using SEM, AFM, TEM, and X-ray spectral analysis. The possibility
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Development of a hydrometallurgical process for the recovery of gold and silver powders from anode slime containing copper, nickel, tin, and zinc Gold Bull. (IF 1.706) Pub Date : 2019-03-20 Wei Dong Xing; Man Seung Lee
In order to recover gold and silver from anode slimes containing Cu, Ni, Sn, and Zn, an integrated hydrometallurgical process consisting of leaching, solvent extraction, and cementation was developed. All the metals together with 10% of Ag(I) were dissolved by the mixture of HCl and H2O2 at the optimum conditions. Separation of Au (III) together with Sn (II) was performed by Cyanex 272 from the leaching
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Electric field–prevented adsorption of hydrogen on supported gold nanoparticles Gold Bull. (IF 1.706) Pub Date : 2019-02-12 Sergey Yu. Sarvadiy; Andrey K. Gatin; Maxim V. Grishin; Vasiliy A. Kharitonov; Nickolay N. Kolchenko; Nadezhda V. Dokhlikova; Boris R. Shub
The adsorption of hydrogen on the surface of gold nanoparticles deposited on a graphite support was studied in the presence of an external electric field by means of scanning tunneling microscopy (STM) and spectroscopy (STS). Hydrogen was adsorbed from the gas phase onto the surface of gold nanoparticles synthesized by impregnation-precipitation method. During the adsorption process, the STM tip was
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Surface plasmon resonance of naked gold nanoparticles for photodynamic inactivation of Escherichia coli Gold Bull. (IF 1.706) Pub Date : 2019-02-06 Sahar Mohammadpour Lashkari; Hasan Kariminezhad; Nazanin Safarnezhad; Hossein Amani
Although antimicrobial photothermal inactivation of naked gold nanostructures using powerful pulsed lasers has been previously studied, there are little reports about their photodynamic antimicrobial properties under the irradiation of low-power density continuous wave lasers. Therefore, this paper attempts to fill this gap. In this paper, we studied the effects of a 40-mW/cm2 continuous Nd:Yag laser
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Three new dicyanidoaurate(I)-based complexes exhibiting significant antiproliferative property: synthesis and characterization Gold Bull. (IF 1.706) Pub Date : 2019-01-03 Ali Aydın; Ahmet Karadağ; Şaban Tekin; Hüseyin Akbaş
The Au(CN)2− ion and its metal-ligand compounds have recently gained considerable interest in industrial applications such as optical diagnostics systems as well as pharmacology with antirheumatic and antitumor activity. Here, [Ni2(N-bishydeten)2][Au(μ-CN)2]3[Au(CN)2]·H2O (C1), [Cu2(N-bishydeten)2][Au(μ-CN)2]3[Au(CN)2]·H2O (C2), and [Zn2(μ-N-bishydetenH)(N-bishydeten)(NC)2Au][Au(CN)2] (C3) were synthesized
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One-pot synthesized porphyrin-based polymer supported gold nanoparticles as efficient catalysts for alkyne hydration and alcohol oxidation in water Gold Bull. (IF 1.706) Pub Date : 2018-12-14 Jian Chen; Ju Zhang; Dajian Zhu; Tao Li
The construction of porous organic polymer from 5,10,15,20-tetraphenylporphyrin (TPP) was described using one-pot Friedel-Crafts alkylation reaction. Au was simultaneously loaded on the porphyrin-based polymer denoted as Au/KAPs(DCM-TPP). This polymer-supported Au was fully characterized by many physicochemical methods. It was found to possess BET surface area of 796 m2 g−1, good thermal stability
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Development of a novel thermo-responsive hydrogel-coated gold nanorods as a drug delivery system Gold Bull. (IF 1.706) Pub Date : 2018-12-08 Mehran Kurdtabar; Gazal Baghestani; Ghasem Rezanejade Bardajee
In this study, at first, gold nanorods (GNRs) were synthesized and then they were coated with a layer of hydrogel composed of poly(N-isopropylacrylamide) (PNIPAM) grafted onto carboxymethyl cellulose (CMC) as a backbone. The chemical structure of GNRs/PNIPAM-g-CMC hydrogel was characterized by Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), atomic-force microscopy (AFM), transmission
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Launching low-energy surface plasmons in purple gold (AuAl 2 ) Gold Bull. (IF 1.706) Pub Date : 2018-11-20 Panupon Samaimongkol; Hans D. Robinson
We confirm that the unusual purple color of the intermetallic compound AuAl2 is of a plasmonic origin by launching surface plasmons (SPs) in thin AuAl2 films. We measure the SP dispersion relation and also use the films to measure the index of refraction of sucrose solutions using standard SP resonance sensing. We find that the SP energy in planar AuAl2 is approximately 2.1 eV, about 0.4 eV lower than
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Au/CdSe hybrid nanoflowers: a high photocurrent generating photoelectrochemical cells Gold Bull. (IF 1.706) Pub Date : 2018-11-20 Krishna Kanta Haldar; Rathindranath Biswas; Amitava Patra; Krishna Kamal Halder; Tapasi Sen
Photoelectrochemical cell composed of solution-processed nanoflower heterostructure of Au core and eight CdSe petals was investigated for enhanced photocurrent generation. The electrode of CdSe nanorods displayed photocurrent density of 2.1 mA/cm2 whereas the Au core CdSe nanoflower exhibited 4.6 mA/cm2 corresponding to a 119% increase during photoelectrochemical cell performance. Both electrodes showed
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Fifty shades of yellow Gold Bull. (IF 1.706) Pub Date : 2018-08-29 Arnaud Manas
The color of ternary Au-Ag-Cu alloys is investigated; a simple and efficient model relying only on the reflectance of gold, silver, and copper is suggested. The alloy color diagram (a⋆,b⋆) based on the alloy proportion (u, v) has the shape of a “wizard’s hat” with special properties. Leuser’s classical triangle can be improved upon these results.
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Effect of M2e peptide–gold nanoparticle conjugates on development of anti-influenza antibodies Gold Bull. (IF 1.706) Pub Date : 2018-08-15 Lev A. Dykman; Sergey A. Staroverov; Alexander S. Fomin
Gold nanoparticles (AuNPs) are successfully used as an adjuvant in the design of effective vaccines and in the preparation of high-affinity antibodies to haptens and complete antigens. Here, we assessed the adjuvant properties of AuNPs conjugated to a synthetic M2e peptide of the influenza A virus capsid. The resulting conjugate, a commercial influenza vaccine, and M2e in combination with different
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Synthesis of gold particles at ionic liquid–ethylene glycol interfaces Gold Bull. (IF 1.706) Pub Date : 2018-08-07 Chunli Lu; Peter Majewski
The paper presents an investigation of the synthesis of gold particles on liquid–liquid interfaces using room temperature ionic liquids (RTIL) and ethylene glycol at temperatures up to 180 °C. The results show that depending on the RTIL used, the resulting gold particles are of different shape like trigonal and hexagonal plates, single fibers as well as bundles of fibers, and polyhedral and globular
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Optimizing of porous silicon alloying process with bimetallic nanoparticles Gold Bull. (IF 1.706) Pub Date : 2018-07-28 Alwan M. Alwan; Duaa A. Hashim; Muslim F. Jawad
Bimetallic Ag–Au alloy nanoparticles with a tunable size and composition were synthesized by laser beam power density. A set of Psi substrates with different morphologies fabricated by laser-assisted etching process with laser power density from 10 to 40 mW/cm2 was explored as a substrate for materialization bimetallic Ag–Au alloy nanoparticles by a simple immersion plating process of Psi in a mixture
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Gold nanoparticle trophic transfer from natural biofilm to grazer fish Gold Bull. (IF 1.706) Pub Date : 2018-07-11 Fanny Perrier; Magalie Baudrimont; Stéphane Mornet; Nathalie Mesmer-Dudons; Sabrina Lacomme; Bruno Etcheverria; Olivier Simon; Agnès Feurtet-Mazel
Nanoparticle (NP) trophic transfer is reported as an important exposure route for organisms in aquatic ecosystems. This study focused on gold nanoparticle (AuNP, PEG-coated, 10 nm diameter) transfer using an experimental benthic food chain which included two trophic levels: natural river biofilm and grazer fish Hypostomus plecostomus. AuNP biofilm accumulation was assessed via water AuNP concentrations
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Reduction of sulphur dioxide using carbon monoxide over gold supported catalysts Gold Bull. (IF 1.706) Pub Date : 2018-06-29 Thelma Ngwenya; Isaac Nongwe; Linda L. Jewell
One percent gold supported on three different metal oxides (TiO2, ZnO and Al2O3) has been evaluated as a catalyst, to reduce sulphur dioxide with carbon monoxide at different reaction temperatures. During the reaction, no carbonyl sulphide was formed and the only sulphur-containing product that was detected was elemental sulphur which condensed as S8 at the reactor exit. High-resolution transmission
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Fluorescent resonance energy transfer of organic fluorescent dyes with gold nanoparticles and their analytical application Gold Bull. (IF 1.706) Pub Date : 2018-06-22 Bin Zhou; Ya-Ting Chen; Xiao-Li Zhen; Liang Lou; Yong-Sheng Wang; Qing-Li Suo
We report five effective fluorescence resonance energy transfer (FRET) systems based on gold nanoparticles (AuNPs) and organic fluorescent dyes, including ionic [fluorescein sodium (FS) and Eosin B (EB)] and cationic [rhodamine 6G (Rh6G), acridine orange (AO), and safranine T (ST)] fluorescent dyes. The fluorescence intensity of the five FRET systems demonstrates that efficient quenching is possible
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Dating geologic gold deposits and authenticating a Greek gold tiara, an ancient gold chalice, and swimming dragon artifacts of the Chinese Han dynasty Gold Bull. (IF 1.706) Pub Date : 2018-06-21 Otto Eugster
In this work, we present the application of the uranium, thorium–helium (U,Th–He) dating method to two different types of gold objects: geologic gold deposits and archeological gold objects. Direct dating of geologic gold deposits is difficult without assuming contemporaneity between gold and datable hydrothermal minerals. We show that our results indicate that the applied dating method opens a new
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Synthesis of gold nanoparticles using Euphorbia tirucalli latex and the microwave method Gold Bull. (IF 1.706) Pub Date : 2018-06-16 Claure N. Lunardi; Mirella P. F. Barros; Marina L. Rodrigues; Anderson J. Gomes
Uniformly sized and shaped gold nanoparticles (AuNP) were produced by microwave irradiation using Euphorbia tirucalli latex. The AuNPs were characterized by ultraviolet visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering, zeta potential, and transmission electron microscopy (TEM). UV–Vis analysis was employed to detect the characteristic surface plasmon
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Wetting ability of human blood in the presence of gold nanoparticles Gold Bull. (IF 1.706) Pub Date : 2018-06-12 L. Torrisi; C. Scolaro; N. Restuccia
Gold nanoparticles are more and more used in bio-medical field for their advantages to be employed as contrast medium for diagnostic images and as targets of disease cells in which thermal-therapy or radiotherapy must be applied. In this contest, a suitable concentration of nanoparticles was added to human blood to study in vitro some physical properties of the treated liquid which is prepared to transport
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The effects of three types of alfalfa plants ( Medicago sativa ) on the biosynthesis of gold nanoparticles: an insight into phytomining Gold Bull. (IF 1.706) Pub Date : 2018-06-12 Marzieh Keshavarzi; Daryoush Davoodi; Shahram Pourseyedi; Saeed Taghizadeh
Phytomining involves bioharvesting of metals from high biomass crops grown in soil substrates. This process has the potential for economic exploitation of low-grade mineralized soils (e.g., gold), which are too poor for conventional mining of metals. There is a lot of evidence that supports the synthesis of gold nanoparticles in living plants. In this study, the bioreduction of Au ions to Au nanoparticles
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Au nanoparticles controlled by lattice Zn 2+ of supports Gold Bull. (IF 1.706) Pub Date : 2018-06-07 Dan Liu; Wensheng Dong; Chunling Liu; Chunli Xu
Supported Au nanoparticles (NPs) have attracted much attention in catalytic field because of their high activity and selectivity. However, its activity was affected by its dispersion. In this work, a controlled impregnation method was used to prepare Au/Zn-hydrotalcites (Au/Zn-HTs). The role of lattice Zn2+ in controlling Au NPs was studied. The size, structure, and composition of Au NPs were characterized
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A multi-size study of gold nanoparticle degradation and reformation in ceramic glazes Gold Bull. (IF 1.706) Pub Date : 2018-06-06 Nathan NL. Dinh; Luke T. DiPasquale; Michael C. Leopold; Ryan H. Coppage
Most traditional ceramic glazes employ high amounts of transition metal colorants that are toxic to the environment and can cause health issues in humans through surface leaching. Gold nanoparticles (Au-NPs) have been found to be environmentally friendly and non-toxic alternative metal colorant in ceramic glazes. The plasmon band observed with Au-NPs can result in vibrant solutions by manipulating
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Surface-induced formation of stereogenic centers on gold nanoparticles through diastereoselective interfacial Henry reaction: an NMR investigation Gold Bull. (IF 1.706) Pub Date : 2018-06-06 Gisya Abdi; Abdolhamid Alizadeh
This study aims at the synthesis of gold nanoparticles (2–3 nm) functionalized with different nitroalkane-terminated thiols and investigates the chemical reactivity of these confined nitroalkanes towards aldehydes to yield β-nitroalcohols. Interfacial Henry reaction between fixed nitroalkane-terminated thiols with various aromatic and heteroaromatic aldehydes resulted in stereogenic centers on the
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Au-Au composites with inverse opal structure for surface-enhanced Raman spectroscopy Gold Bull. (IF 1.706) Pub Date : 2018-06-03 N.A. Martynova; A.E. Goldt; A.V. Grigorieva
Golden inverse opals additionally decorated with 15.5 ± 1.5 nm gold nanoparticles are proposed as reusable substrates for surface-enhanced Raman spectroscopy (SERS). Gold nanoparticles are found to be uniformly distributed making an input of enhancement ability of spectral characteristics with the colloidal system by ten times. This technique is demonstrated to be efficient in spectral features tuning
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Correction to: Synthesis and characterization of gold-containing oxides of K 2NiF 4 or Nd 2CuO 4 structure type Gold Bull. (IF 1.706) Pub Date : 2018-05-02 Jerffersson Rodríguez Delgado,Verónica García Rojas,Gilles H. Gauthier
The original version of this article unfortunately contained mistakes. The presentation of Tables 2, 3, 4, 5, and 6 was incorrect. The corrected tables are given below.
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Synthesis and characterization of gold-containing oxides of K 2 NiF 4 or Nd 2 CuO 4 structure type Gold Bull. (IF 1.706) Pub Date : 2018-04-17 Jerffersson Rodríguez Delgado; Verónica García Rojas; Gilles H. Gauthier
In this work, different materials of Nd2CuO4 and K2NiF4 Ruddlesden-Popper structure have been prepared by solid-state reaction in air and high temperatures. The powders of mixed oxides, of general formula La2Li0.5M0.5 − xAu x O4 (M = Cu, Ni), were prepared from [Au(NH3)4](NO3)3 as gold source. The stoichiometric proportions of the all reagents (including La2O3, NiCO3, CuO) were grounded with a LiOH
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Au monolayer film coating with graphene oxide for surface enhanced Raman effect Gold Bull. (IF 1.706) Pub Date : 2018-04-09 Qiang Ma; Xianpei Ren; Liuqing Pang; Min Zhu; Yuzhen Zhao; Siyi Ding; Shaopeng Tian; Huaping Ren; Zongcheng Miao
A self-terminated electrochemical atomic layer deposition process is developed to fabricate Au monolayer (ML) film layer-by-layer. It is found that the under potential deposited hydrogen (Hupd) provides perfect termination after each ML deposition and the further ML growth can be replicated after a surface activation using a positive potential to remove the Hupd layer. Voltammetric measurements, deposition
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Polyion complex micelles to stabilize gold nanoparticles for catalytic reduction of 4-nitrophenol Gold Bull. (IF 1.706) Pub Date : 2017-12-19 Yu Dai; Tao Ren; Ying Wang; Xiaojin Zhang
For the reduction of 4-nitrophenol to 4-aminophenol, gold nanoparticles (AuNPs) below 10 nm have high catalytic activity. However, AuNPs in aqueous solution or organic solvents are not stable in the absence of stabilizers. Here, we describe polyion complex (PIC) micelles as the stabilizer to prepare highly dispersed AuNPs for the first time. The preparation route is very gentle, easy, and reproducible
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