Optical Probe Studies of Polymer Solutions

9423702 Phillies聚合物溶液正在使用光散射光谱法（这是一种用于确定进行布朗运动的溶解大分子的运动的非侵入性技术），光学探针扩散（其中光散射用于监测探针颗粒通过聚合物溶液的扩散）和流变仪器进行研究。 不同尺寸的探针，在多个角度的散射实验，被用来研究聚合物传输的长度尺度效应的重要性。 仔细测定光散射谱线的形状，将允许在粘性聚合物溶液中看到的现象与在玻璃化转变附近的简单溶液中看到的现象进行比较。 实验，辅以分析理论，计算机模拟和系统的文献综述，将应用于努力完善或反驳流体动力学标度模型和聚合物动力学的其他治疗。 本研究的目的是提高对聚合物动力学的科学理解（例如，粘度、粘弹性行为、自扩散、旋转扩散）。 聚合物溶液的动力学在各种科学、技术和实际应用中都很重要，从纯科学（活细胞内蛋白质和mRNA的扩散）到普通（奶昔的厚度）。 ***

9423702 Phillies Polymer solutions are being studied with light-scattering spectroscopy (which is a non-invasive technique for determining the movements of dissolved macromolecules performing Brownian motion), optical probe diffusion (in which light scattering is used to monitor the diffusion of probe particles through a polymer solution), and rheological instrumentation. Probes of different sizes, and scattering experiments at multiple angles, are used to examine the importance of length scale effects in polymer transport. Careful determinations of light scattering spectral lineshapes will allow comparison of phenomena seen in viscous polymer solutions with phenomena seen in simple solutions near glass transitions. Experiment, supplemented with analytic theory, computer simulations, and systematic literature review, will be applied in efforts to refine or refute the hydrodynamic scaling model and other treatments of polymer dynamics. %%% The objective of this research is to improve scientific understanding of polymer dynamics (e.g., viscosity, viscoelastic behavior, self-diffusion, rotational diffusion) in dilute and non-dilute solutions. The dynamics of polymer solutions are important in a wide variety of scientific, technical, and practical applications, from the purely scientific (diffusion of proteins and mRNAs within living cells) to the mundane (thickness of milkshakes). ***