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首页> 外文学位 >Interactions and collective behavior of attractive colloidal rods and microspheres grafted with filamentous bacteriophage.
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Interactions and collective behavior of attractive colloidal rods and microspheres grafted with filamentous bacteriophage.

机译：有吸引力的胶体棒和微球与丝状噬菌体嫁接的相互作用和集体行为。

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摘要

Interactions and collective behavior are investigated for two systems of attractive colloidal rods and colloidal stars. Attractive colloidal rods are constructed by grafting the temperature-sensitive polymer poly(N-isopropylacrylamide) (PNIPAM) to the surface of the semi-flexible filamentous fd virus. The phase diagram of fd-PNIPAM system becomes independent of ionic strength at high salt concentration and low temperature, i.e., the rods are sterically stabilized by the polymer. However, the network of rods undergoes a sol-gel transition as the temperature is raised. The viscoelastic moduli of fd and fd-PNIPAM suspensions are compared as a function of temperature, and the effect of ionic strength on the gelling behavior of fd-PNIPAM solution is measured. For all fluidlike and solidlike samples, the frequency-dependant linear viscoelastic moduli can be scaled onto universal master curves.;Colloidal stars are constructed by grafting to 1 mum polystyrene beads a dense brush of 1 mum long and 10 nm wide semi-flexible filamentous viruses. The pair interaction potentials of colloidal stars are measured using an experimental implementation of umbrella sampling, a technique originally developed in computer simulations in order to probe rare events. The influence of ionic strength and grafting density on the interaction is measured. Good agreements are found between the measured interactions and theoretical predictions based upon the osmotic pressure of counterions.
机译：研究了两个有吸引力的胶体棒和胶体星的相互作用和集体行为。通过将温度敏感的聚合物聚（N-异丙基丙烯酰胺）（PNIPAM）接枝到半柔性丝状fd病毒的表面来构造有吸引力的胶体棒。 fd-PNIPAM体系的相图在高盐浓度和低温下变得不受离子强度的影响，即，棒在空间上被聚合物稳定。然而，随着温度的升高，棒的网络经历溶胶-凝胶转变。比较了fd和fd-PNIPAM悬浮液的粘弹性模量随温度的变化，并测量了离子强度对fd-PNIPAM溶液胶凝行为的影响。对于所有流体样和固体样，可以将频率相关的线性粘弹性模量按比例缩放到通用主曲线上。胶体星是通过将1 mm长，10 nm宽的半柔性丝状病毒嫁接到1 m的聚苯乙烯珠上而构建的。胶体星对的相互作用势是使用伞式采样的实验实现方法进行测量的，该方法最初是在计算机模拟中开发的，旨在探测稀有事件。测量离子强度和接枝密度对相互作用的影响。基于抗衡离子的渗透压，在测得的相互作用与理论预测之间找到了良好的一致性。

著录项

  • 作者

    Huang, Fei.;

  • 作者单位

    Brandeis University.;

  • 授予单位 Brandeis University.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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