Colloidal interactions and micromechanics in 2D and 3D gels

2D 和 3D 凝胶中的胶体相互作用和微观力学

• 批准号: 0553656
• 负责人: Eric Furst
• 金额: $ 10.5万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0553656&HistoricalAwards=false
• 关键词: Colloidal; interactions; micromechanics; 2D; 3D

ABSTRACTProposal Number: 0553656Principal Investigator: Furst, EricAffiliation: University of DelawareProposal Title: Colloidal interactions and micromechanics in 2D and 3D gelsIntellectual Merit.This work will investigate interfacial phenomena and interactions that underlie the properties of colloidal aggregates. This will be accomplished using novel experiments based on optical trapping, which enable directly assembly of model aggregates from individual colloids and controlled deformation with simultaneous measurement of microscopic stresses. The mechanics to be studied, unrecognized until now, have considerable consequences for the processing and properties of particulate gels, because of their influence on the yield stress, aging properties and moduli of these materials. The interactions and mechanics of two-dimensional colloidal systems will be investigated. Because particulate gels occur in a wide variety of manufacturing processes, including coatings, pharmaceutical formulations, ceramic parts manufacturing, mineral recovery and lubricant degradation, there is considerable interest in the ability to predict and control their properties. Two-dimensional systems are important due to the use of colloids for controlling the interactions in dispersed fluid phases (i.e. Pickering emulsions.) Although there have been notable advances in recent years, the fundamental mechanisms of the mechanical and rheological properties of particulate gels based on interparticle interactions, microstructure and micromechanics have yet to be fully understood. By studying the nano- and micro-scale physics, the fundamentals needed to synthesize new materials, and improve the prediction and control of product and processing properties in existing materials will be established. Furthermore, the understanding and control of colloidal interactions extends beyond gel rheology to novel and emerging applications, such as photonic crystals, chembiosensors and nanotechnology. Broader Impacts. This work will provide education and research training for one graduate student and one undergraduate research assistant in the technologically-critical fields of colloid science and interfacial phenomena. The training experience will be significantly enhanced through international and industrial collaborations. Results of this research will reach a broad community of scientists and engineers through publications in journals and presentations at national and international scientific meetings, including informal participation of the PI and his graduate students in the European Union SOFTCOMP Network of Excellence. The educational impact will be enhanced through short course instruction, lectures provided at KU-Leuven, and the organization of a symposium on the applications of laser tweezers in complex and colloidal fluids.

摘要提案编号：0553656主要研究者：Furst，EricAffiliation：University of DelawaraProposal Title：Colloidal Interactions and Micromechanics in 2D and 3D gelsIntellectual Merit.这项工作将研究界面现象和相互作用，这些现象和相互作用是胶体聚集体性质的基础。这将使用新的实验的基础上完成的光学捕获，这使得直接组装的模型聚集体从个别胶体和控制变形的同时测量微观应力。要研究的力学，尚未认识到，到现在为止，有相当大的后果颗粒凝胶的加工和性能，因为它们的屈服应力，老化性能和这些材料的模量的影响。将研究二维胶体系统的相互作用和力学。由于颗粒凝胶出现在各种各样的制造过程中，包括涂料，药物制剂，陶瓷部件制造，矿物回收和润滑剂降解，因此预测和控制其性能的能力受到相当大的关注。由于使用胶体来控制分散流体相（即皮克林乳液）中的相互作用，二维系统是重要的。虽然近年来已经有了显着的进展，颗粒凝胶的机械和流变性能的基础上，颗粒间的相互作用，微观结构和微观力学的基本机制还没有得到充分的理解。通过研究纳米和微米尺度的物理学，将建立合成新材料所需的基本原理，并改善现有材料中产品和加工性能的预测和控制。此外，对胶体相互作用的理解和控制超出了凝胶流变学，扩展到新的和新兴的应用，如光子晶体，化学生物传感器和纳米技术。更广泛的影响。这项工作将为一名研究生和一名本科生研究助理提供胶体科学和界面现象技术关键领域的教育和研究培训。培训经验将通过国际和行业合作得到显著增强。这项研究的结果将通过在期刊上发表文章和在国家和国际科学会议上发表演讲，包括PI和他的研究生非正式参与欧盟ECOCOMP卓越网络，接触到广泛的科学家和工程师社区。教育的影响将通过短期课程教学，在KU-Leuven提供讲座，并组织一个关于激光镊子在复杂和胶体流体中的应用的研讨会来加强。