Colloidal interactions and micromechanics in 2D and 3D gels

摘要项目编号：0553656项目负责人：第一，研究员单位：特拉华大学项目名称：二维和三维凝胶中的胶体相互作用和微观力学。这项工作将研究胶体聚集体性质的界面现象和相互作用。这将通过基于光学捕获的新实验来实现，该实验可以直接从单个胶体中组装模型聚集体，并通过同时测量微观应力来控制变形。迄今为止尚未认识到的有待研究的力学对颗粒凝胶的加工和性能有相当大的影响，因为它们影响这些材料的屈服应力、老化性能和模量。二维胶体系统的相互作用和力学将被研究。由于颗粒凝胶存在于各种各样的制造过程中，包括涂料、药物配方、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引起了相当大的兴趣。二维系统是重要的，因为使用胶体来控制分散的流体相（即皮克林乳液）中的相互作用。尽管近年来取得了显著的进展，但基于颗粒间相互作用、微观结构和微观力学的颗粒凝胶力学和流变特性的基本机制尚未完全了解。通过对纳米和微观尺度物理的研究，将建立合成新材料所需的基础，并改善对现有材料的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从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。通过国际和工业合作，将大大提高培训经验。这项研究的结果将通过在期刊上的出版物和在国家和国际科学会议上的演讲，包括PI和他的研究生在欧盟SOFTCOMP卓越网络的非正式参与，向广泛的科学家和工程师群体发表。将通过短期课程指导、在鲁汶大学提供讲座以及组织一次关于激光镊子在复杂流体和胶体流体中的应用的专题讨论会来加强教育影响。

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.