SGER: Colloid Aggregation Self-Organization and Dynamics at the Air/Water Interface

SGER：空气/水界面的胶体聚集自组织和动力学

• 批准号: 9806321
• 负责人: Estela Blaisten-Barojas
• 金额: $ 10万
• 依托单位: George Mason University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-15 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806321&HistoricalAwards=false
• 关键词: SGER; Colloid; Aggregation; Self; Organization

Abstract CTS-9806321 Estella Blaisten-Barojas, George Mason University It was observed that an inorganic precipitate (Dogtooth Spar) absorbed at the air-water interface bifurcates into two aggregation structures. One structure develops into a two-dimensional fractal gel previously identified in literature, and another self-organizes into a two-dimensional colloidal periodic structure (lattice) of crystals that was observed for the first time by the P.I. The new crystals have a distorted tetrahedral shape, do not aggregate, and spontaneously may arrange into the periodic structure. The main focus of the project is the clarification of the conditions under which self-organization occurs, characterize the crystals formed at the air-water interface, and understanding the role of crystallites in the respective fractal growth at the air-water interface. The P.I. proposed an initial model that includes the repulsive electrostatic forces and attractive capillary forces. If this model is true, then the observed self-organization could be achieved in other systems. Video microscopy and crystal interaction models will be used in the investigation. If successful, the project will clarify a self-organizing mechanism with relevance to colloidal science and materials synthesis. ***

本文观察到在空气-水界面吸收的一种无机沉淀物(狗牙石)分成两种聚集结构。一种结构发展成以前文献中确定的二维分形凝胶，另一种结构自组织成二维胶体周期结构(晶格)，这是P.I.首次观察到的。新晶体具有扭曲的四面体形状，不聚集，并可能自发排列成周期结构。该项目的主要重点是澄清自组织发生的条件，表征在空气-水界面形成的晶体，并了解微晶在空气-水界面各自的分形生长中的作用。P.I.提出了一个包含排斥力和吸引毛细作用力的初始模型。如果这个模型是正确的，那么观察到的自组织可以在其他系统中实现。研究中将使用视频显微镜和晶体相互作用模型。如果成功，该项目将阐明与胶体科学和材料合成相关的自组织机制。***