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Flow Alters the Interfacial Reactions of Upconversion Nanocrystals Probed by In Situ Sum Frequency Generation
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2020-02-26 , DOI: 10.1002/admi.201902046 Yonglan Xi 1 , Qingbo Xiao 1, 2 , Jing Du 1 , Xiaomei Ye 1 , Xiangping Kong 1 , Zhizhou Chang 1 , Tie Li 2 , Hongmei Jin 1 , Jian Wang 2 , Hongzhen Lin 2
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2020-02-26 , DOI: 10.1002/admi.201902046 Yonglan Xi 1 , Qingbo Xiao 1, 2 , Jing Du 1 , Xiaomei Ye 1 , Xiangping Kong 1 , Zhizhou Chang 1 , Tie Li 2 , Hongmei Jin 1 , Jian Wang 2 , Hongzhen Lin 2
Affiliation
Particle moving is a fundamental phenomenon of colloidal nanoparticles (NPs), but its influence on the interfacial interaction is far from been clarified. Herein, by mimicking the particle moving of upconverting fluoride NPs in a flowing cell, highly dependence of interfacial reactions on the particle moving of the colloidal NPs is clearly revealed by adopting combined in situ sum frequency generation and photoluminescence spectroscopies. It is found that particle moving can induce the rearrangement of the adsorbed interfacial water due to generating a more positively charged surface. More importantly, besides more prone to adsorb negatively charged carboxyl group of Rhodamine B via enhanced electrostatical interaction, particle moving at pH of 6.8 could reorient the xanthene ring of the dye parallel to the NP surface, via repelling the positively charged diethylamino groups. As a consequence, fluorescence resonance energy transfer efficiency from the upconverting NPs to Rhodamine B can be reversibly modulated by only tuning the flow. This work provides new insight into the interfacial interactions of the colloidal NPs, which are expected to guide their surface modification and practical applications.
中文翻译:
流动改变原位总和频率产生探测的上转换纳米晶体的界面反应
颗粒移动是胶体纳米颗粒(NPs)的基本现象,但其对界面相互作用的影响尚不清楚。在本文中,通过模拟流动池中上转换的氟化物NPs的粒子运动,通过采用原位总和频率产生和光致发光光谱学,可以清楚地揭示界面反应对胶体NPs粒子运动的高度依赖性。已经发现,由于产生更带正电的表面,粒子移动可引起吸附的界面水的重排。更重要的是,除了更易于通过增强的静电相互作用吸附罗丹明B的带负电的羧基外,在pH值为6.8的情况下移动的颗粒还可以使染料的x吨环平行于NP表面取向,通过排斥带正电荷的二乙氨基。结果,仅通过调节流量就可以可逆地调节从上转换NP向若丹明B的荧光共振能量转移效率。这项工作提供了胶体NP的界面相互作用的新见解,有望指导其表面改性和实际应用。
更新日期:2020-02-26
中文翻译:
流动改变原位总和频率产生探测的上转换纳米晶体的界面反应
颗粒移动是胶体纳米颗粒(NPs)的基本现象,但其对界面相互作用的影响尚不清楚。在本文中,通过模拟流动池中上转换的氟化物NPs的粒子运动,通过采用原位总和频率产生和光致发光光谱学,可以清楚地揭示界面反应对胶体NPs粒子运动的高度依赖性。已经发现,由于产生更带正电的表面,粒子移动可引起吸附的界面水的重排。更重要的是,除了更易于通过增强的静电相互作用吸附罗丹明B的带负电的羧基外,在pH值为6.8的情况下移动的颗粒还可以使染料的x吨环平行于NP表面取向,通过排斥带正电荷的二乙氨基。结果,仅通过调节流量就可以可逆地调节从上转换NP向若丹明B的荧光共振能量转移效率。这项工作提供了胶体NP的界面相互作用的新见解,有望指导其表面改性和实际应用。