| 项目编号: | 1511826
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| 项目名称: | UNS: Role of dopant concentration and distribution in the environmental behavior of indium tin oxide nanoparticles |
| 作者: | Navid Saleh
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| 承担单位: | University of Texas at Austin
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| 批准年: | 2014
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| 开始日期: | 2015-06-15
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| 结束日期: | 2018-05-31
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| 资助金额: | USD299917
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | nito
; tin doping
; concentration
; distribution
; toxicity
; fate
; cutting-edge nanomaterial
; navid nano-scale metal oxide
; such doped metal oxide particle
; project
; nano-scale indium tin oxide
; dopant concentration
; nano-scale
; austin?s diversity mentoring fellowship
; organic light-emitting diode
|
| 英文摘要: | #1511826
Saleh, Navid
Nano-scale metal oxides are one of the most prepared and used engineered nanomaterials with applications in electronics, optical devices, and medical processes and devices. Nano-scale indium tin oxide (nITO) is one such doped metal oxide particle that is used heavily in electronic display modules such as touch screens, electronic inks, and organic light-emitting diodes. Manufacturing processes and end-of-life disposal events for these products might serve as exposure pathways of nITO to humans and the natural environment and thus raise concerns for eco- and nano-toxicity. This project systematically assesses the influence of crystal properties (at the atomic scale) on the environmental health and safety of nITO.
The purpose of this project is to determine key physicochemical properties and band gap energetics of nITO as a function of the concentration and distribution of tin doping and to elucidate mechanisms for fate, transport, transformation, and toxicity of these nano-scale bimetallics. This study will address the following aims: (1) synthesize nITO with tunable band structure via control over dopant concentration and distribution; (2) sample preparation and characterization of nITO for a range of tin doping to gain detailed understanding of crystal structure, bimetallic morphology, and colloidal properties; (3) examination of aggregation kinetics, fractal dimension, and porous media transport as a function of ionic strength and organic matter composition; (4) evaluation of microbial toxicity (to planktonic and biofilm cells) and toxicity mechanisms using band gap energetics and ROS measurements; (5) assessment of chemical transformation of nITO and evaluation of fate and toxicity of the transformed materials. This study will be the first of its kind, using changes in fundamental electronic and physicochemical properties of nITO caused by controlled variations in tin doping distribution and concentration at the atomistic level to elucidate mechanisms of fate, transport, and toxicity in aquatic environments.
The proposed work will generate critical and fundamental knowledge to better understand the environmental implications of a highly concerning and commercially important next- generation nanomaterial, nITO. nITO, that are utilized as transparent catalysts in touch-screen devices with higher recycling rate and relatively short lifetime, necessitate understanding their environmental safety. The results obtained from this project will result in direct societal benefit by providing better understanding of nTO environmental health and safety. In outreach and education aspects, the PIs will continue their strong track records of recruiting students from underrepresented groups. At least one graduate student from an underrepresented group will be attracted via the University of Texas at Austin?s Diversity Mentoring Fellowship, while undergraduate women and minority students will be brought into this cutting-edge nanomaterial and microbiology research utilizing the University's Graduates Linked with Undergraduates in Engineering (GLUE) and the Texas Research Experience (TREX) programs. Multi-pronged outreach activities at San Juan Diego High School (which has 85% Hispanic students) will have profound educational impact on the high school students through seminars and hands-on experiments. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94388
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Navid Saleh. UNS: Role of dopant concentration and distribution in the environmental behavior of indium tin oxide nanoparticles. 2014-01-01.
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