Direct Measurements of Fundamental Sintering Parameters in Nanoparticles
纳米粒子基本烧结参数的直接测量
基本信息
- 批准号:1006894
- 负责人:
- 金额:$ 45万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-07-15 至 2015-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
TECHNICAL SUMMARY: The intellectual merit of this proposal focuses on the fundamental mechanisms that influence the low temperature (300˚C) sintering of metallic nanoparticles (NPs). Existing models cannot accurately predict the sintering response of NPs at low temperatures. A synergistic combination of state-of-the art processing and in-situ and ex-situ transmission electron microscopy will be employed to investigate sintering of NPs. Pairs of NPs that are free of dispersants will be produced to meet the stringent requirements necessary for this study. This is crucial as the presence of organic dispersants that are typically present on the surfaces of NPs interfere with the intrinsic sintering behavior of the NPs at low temperatures. Second, a state-of-the-art, aberration-corrected TEM/STEM equipped with a novel heating stage for in-situ sintering experiments will be utilized to perform real-time measurements on NPs of neck growth, interparticle distance and boundary mobility. Third, correlations will be made between the studies performed on pairs of NPs with studies using realistic, three-dimensional particle morphologies in thick films. These experiments will increase fundamental understanding of sintering in metallic nanoparticles by 1) Determining how particle size, temperature, and particle geometry influence sintering mechanisms in NPs, 2) Measuring the influence of particle size, temperature, and particle geometry on surface or grain boundary diffusivity and grain boundary mobility in NPs, 3) Identifying the role of defects, particularly twins on the sintering behavior of NPs, and 4) Determining the extent to which the electron beam, influences the measured mass transport rates during in situ TEM/STEM experiments.NON-TECHNICAL SUMMARY: Thick film materials are currently used in a large number of diverse applications including many electronic devices. The market for these devices is growing rapidly and improvements in technologies are critical for these advancements. For example, according to III-Vs Review (Vol. 17, no 2. March 2004, pg 7.), the market for thick films was estimated at $16.8 billion in 2008 with significant growth likely in the future due to the increases in portable telecommunication devices. Current technologies require processing temperatures of up to 800˚C, which severely restricts the materials that can be utilized and drives up costs significantly. In addition, there are a number of new technologies that would benefit from reduced processing temperatures for thick films including biosensors and thick film solar cells. The proposed research focuses on understanding the fundamental mechanisms that would allow the processing of thick films of metallic nanoparticles at temperatures less than 300˚C. The proposed activities encompass outreach activities offering deaf students, who are highly underrepresented in science and engineering, research opportunities related to the proposed work. A recently established partnership between UT Austin and the Texas School for the Deaf is in need of additional research projects in which students can be placed and the proposed activities will provide a critical mass of projects and students that will significantly benefit this program.
技术概述:该提案的知识价值集中在影响金属纳米颗粒(NP)低温(300 ℃)烧结的基本机制上。现有的模型不能准确地预测纳米粒子在低温下的烧结响应。将采用最先进的加工技术与原位和非原位透射电子显微镜的协同组合来研究纳米颗粒的烧结。将生产不含分散剂的NP对,以满足本研究所需的严格要求。这一点至关重要,因为通常存在于纳米颗粒表面的有机分散剂的存在会干扰纳米颗粒在低温下的固有烧结行为。其次,一个国家的最先进的,像差校正TEM/STEM配备了一个新的加热阶段,原位烧结实验将被用来执行实时测量的颈部生长,颗粒间距离和边界流动性的纳米粒子。第三,将在对纳米粒子进行的研究与使用现实的厚膜中的三维粒子形态的研究之间进行相关性。这些实验将通过以下方式增加对金属纳米颗粒中烧结的基本理解:1)确定颗粒尺寸、温度和颗粒几何形状如何影响纳米颗粒中的烧结机制,2)测量颗粒尺寸、温度和颗粒几何形状对纳米颗粒中的表面或晶界扩散率和晶界迁移率的影响,3)识别缺陷的作用,特别是孪晶对纳米颗粒烧结行为的影响,以及4)确定电子束在原位TEM/STEM实验期间影响测量的质量传输速率的程度。这些设备的市场正在迅速增长,技术的改进对于这些进步至关重要。例如,根据III-Vs Review(Vol. 17,no 2. 2004年3月,第7页),2008年厚膜市场估计为168亿美元,由于便携式电信设备的增加,未来可能会有显著增长。 目前的技术需要高达800 ℃的加工温度,这严重限制了可利用的材料,并显著提高了成本。此外,还有许多新技术将受益于降低厚膜处理温度,包括生物传感器和厚膜太阳能电池。拟议的研究重点是了解允许在低于300 ℃的温度下处理金属纳米颗粒厚膜的基本机制。 拟议的活动包括开展外联活动,为在科学和工程专业人数严重不足的聋人学生提供与拟议工作有关的研究机会。最近建立的合作关系UT奥斯汀和得克萨斯州聋人学校之间需要额外的研究项目,学生可以被放置和拟议的活动将提供一个项目和学生,将显着受益于这个程序的临界质量。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Desiderio Kovar其他文献
ADDITIVE MANUFACTURING OF SI-SIC CERMETS FOR COMBUSTION DEVICE APPLICATIONS
用于燃烧装置应用的 SI-SIC 金属陶瓷的增材制造
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
P. Radyjowski;D. Bourell;Desiderio Kovar;J. Ellzey - 通讯作者:
J. Ellzey
Laser ablation of nanoparticles and nanoparticulate, thick Fe_1.92Tb_0.3Dy_0.7 films
纳米颗粒和纳米颗粒厚 Fe_1.92Tb_0.3Dy_0.7 薄膜的激光烧蚀
- DOI:
- 发表时间:
2010 - 期刊:
- 影响因子:0
- 作者:
James Ma;M. Becker;J. Keto;Desiderio Kovar - 通讯作者:
Desiderio Kovar
A molecular dynamics study of the effects of velocity and diameter on the impact behavior of zinc oxide nanoparticles
速度和直径对氧化锌纳米颗粒撞击行为影响的分子动力学研究
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:1.8
- 作者:
Scott Burlison;M. Becker;Desiderio Kovar - 通讯作者:
Desiderio Kovar
High-temperature deformation of Al2O3/Y-TZP particulate composites
Al2O3/Y-TZP颗粒复合材料的高温变形
- DOI:
10.1016/s1359-6454(03)00175-7 - 发表时间:
2003 - 期刊:
- 影响因子:9.4
- 作者:
Jue Wang;E. Taleff;Desiderio Kovar - 通讯作者:
Desiderio Kovar
Scale Effects on the Melting Behavior of Silver Nanoparticles
尺度对银纳米颗粒熔化行为的影响
- DOI:
- 发表时间:
2010 - 期刊:
- 影响因子:0
- 作者:
M. Asoro;Desiderio Kovar;J. Damiano;P. Ferreira - 通讯作者:
P. Ferreira
Desiderio Kovar的其他文献
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{{ truncateString('Desiderio Kovar', 18)}}的其他基金
Mechanisms for Film Formation During Room Temperature Micro Cold Spray of Ceramics
陶瓷室温微冷喷涂成膜机理
- 批准号:
2102818 - 财政年份:2021
- 资助金额:
$ 45万 - 项目类别:
Standard Grant
A Manufacturing Process for Producing Thick Films with Controlled Microstructures
生产具有受控微结构的厚膜的制造工艺
- 批准号:
1435949 - 财政年份:2014
- 资助金额:
$ 45万 - 项目类别:
Standard Grant
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