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Optical parameters, antibacterial characteristics and structure correlation of copper ions in cadmium borate glasses
Journal of Materials Research and Technology ( IF 6.2 ) Pub Date : 2020-08-02 , DOI: 10.1016/j.jmrt.2020.07.057
A.M. Abdelghany , Amal Behairy

Binary base borate glass of nominal composition (45CdO.55B2O3 mol%) and other samples containing up to 1.6 mol% CuO were successfully prepared using melt annealing route. Fourier transforms infrared (FTIR) spectra of the prepared glasses were studied to identify the structural building groups within the glasses and the role of Cu ions in the matrix arrangement.

UV spectra of studied glasses reveal two intense narrow bands originally located at about 235 and 310 nm attributed for the presence of trace iron impurities present on the chemical used for preparation even in the ppm level. Additional analyzed broad visible band centered at about 780 nm appears in the spectra of CuO doped glasses and exhibit splitting at high CuO content. Optical energy gap and other physical parameters including refractive index, density, molar volume, molar refraction, electronic polarizability, and optical basicity reveal strong correlation with copper ion speciation.

Both experimental and deconvoluted FTIR spectra of the studied glasses reveal characteristic absorption bands indicating the presence of both triangular and tetrahedral borate groups in their separate vibrational sites. The presence of Cu ions within the doping level is observed to cause no changes in the main characteristic IR bands but limited changes in the intensity of some bands and loosing of the splitting are observed.

Antibacterial studies disclose diverse inhibition zone associated with an increase of CuO content and type of bacteria under examination connected with their activity index percent.



中文翻译:

硼酸镉玻璃中铜离子的光学参数,抗菌特性和结构相关性

使用熔融退火路线成功地制备了标称成分为(45CdO.55B 2 O 3 mol%)的二元基硼酸盐玻璃和其他含1.6mol %CuO的样品。研究了制备的玻璃的傅立叶变换红外(FTIR)光谱,以确定玻璃内部的结构构造基团以及Cu离子在基质排列中的作用。

被研究的玻璃的紫外光谱显示出两个强烈的窄带,它们最初位于大约235和310 nm处,这归因于痕量铁杂质的存在,即使在ppm含量的情况下,该杂质仍存在于用于制备的化学品中。在CuO掺杂的玻璃的光谱中出现了另外分析的中心在780 nm处的宽可见带,并在高CuO含量下出现了分裂。光学能隙和其他物理参数(包括折射率,密度,摩尔体积,摩尔折射,电子极化率和光学碱度)与铜离子的形成密切相关。

被研究眼镜的实验和去卷积FTIR光谱均显示出特征吸收带,表明在其独立的振动部位同时存在三角形和四面体硼酸根。观察到掺杂水平内Cu离子的存在不会引起主要特征IR谱带的变化,但是观察到某些谱带的强度的变化有限,并且观察到分裂的松散。

抗菌素研究揭示了与CuO含量和受检细菌类型增加有关的多种抑制区,以及它们的活性指数百分比。

更新日期:2020-08-02
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