International Postdoctoral Fellows Program: Interactions of Macropolymers with Microcolloids in Aqueous Systems

该奖项隶属于国际博士后研究员计划，该计划使美国科学家和工程师能够在国外公认的卓越中心进行三到十二个月的研究。该计划的奖励为联合研究提供了机会，并利用独特或互补的设施、专业知识和国外的实验条件。该奖项将支持加州大学伯克利分校的Jon D. Chorover博士与瑞士日内瓦大学的Jacques Buffle教授进行为期12个月的博士后研究访问。天然水生系统中化学物质的运输是由溶质在固相和水相之间的分配所调节的。胶体是固体颗粒中最小的，可以很容易地被流动流体夹带和运输，从而为吸附的无机和有机吸附剂提供运输。虽然胶体介导的运输被认为是污染物运输的重要机制，但影响胶体行为的基本过程尚不清楚。有机-聚合物/无机胶体组合在天然水生和土壤系统中普遍存在，这些聚集体与单独的无机颗粒具有截然不同的胶体性质。在过去的十年中，胶体系统的原位研究技术有了显著的进步，但实验人工制品的影响还不为人所知。因此，对胶体结构和稳定性的仔细研究包含了一些互补的分析。在拟议的项目中，Chorover博士和Buffle教授将研究阴离子高分子聚合物和无机微胶体之间的相互作用。该奖励建议提供资金用于支付国际旅行、12个月的津贴、参加会议的旅费和Chorover博士家人的受抚养津贴。

This award is under the International Postdoctoral Fellows Program, which enables U.S. scientists and engineers to conduct three to twelve months of research at foreign centers of proven excellence. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad. This award will support a twelve-month postdoctoral research visit by Dr. Jon D. Chorover of the University of California, Berkeley, to work with Professor Jacques Buffle of the University of Geneva in Switzerland. The transport of chemicals in natural aquatic systems is regulated by the partitioning of solutes between the solid and aqueous phases. Colloids, the smallest of the solid particles, may be readily entrained and transported by the mobile fluid, thereby providing transport for sorbed inorganic and organic adsorptives. Although colloid mediated transport is considered an important mechanism for contaminant transport, the basic processes affecting colloidal behavior are poorly understood. Organic-polymer/inoranic colloid associations are ubiquitous in natural aquatic and soil systems and these aggregates have profoundly different colloidal properties than the inorganic particles alone. The technology for in situ study of colloidal systems has improved dramatically over the last decade, yet the effects of experimental artifacts are not well known. Careful investigations of colloidal structure and stability therefore incorporate several complimentary analyses. In the proposed project, Dr. Chorover and Professor Buffle will study interactions between anionic macropolymers and inorganic microcolloids. The award recommendation provides funds to cover international travel, a stipend for twelve months, travel to meetings, and a dependent allowance for Dr. Chorover's family.