Optical Diffusion Diagnostics of Evolving Polymer Foams

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, APPLIED
M. V. Alonova, S. S. Volchkov, D. A. Zimnyakov, A. A. Isaeva, E. A. Isaeva, E. V. Ushakova, O. V. Ushakova
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Abstract

Various approaches to the optical diagnostics of evolving polymer foams formed as a result of a decrease in the external pressure according to a given scenario in the “polymer-supercritical fluid” systems are considered. Formed polymer foams are considered as a material platform for the creation of scaffolds for biomedical applications. Diagnostics of the current state of the foam was carried out by statistical analysis of the spatiotemporal fluctuations of the probe laser radiation, multiple scattered in the volume of the evolving foam, or by analyzing the fluorescent response during foaming of the “polymer-fluorophore” mixture, pumped by laser radiation in the absorption band of the fluorophore. A relationship has been established between the average lifetime of dynamic speckles in scattered laser light and a generalized parameter characterizing the foam expansion dynamics. It was also found that the waveguide effect in the walls of the formed pores has a significant influence on the fluorescent response of the evolving foam, leading to an increase in the characteristic dwell time of fluorescence radiation in the walls and, accordingly, to an increase in the contribution of the induced component to the fluorescent response.

Abstract Image

不断演变的聚合物泡沫的光学扩散诊断技术
本研究考虑了在 "聚合物-超临界流体 "系统中,根据给定情景降低外部压力而形成的不断演化的聚合物泡沫的各种光学诊断方法。形成的聚合物泡沫被视为创建生物医学应用支架的材料平台。通过统计分析探针激光辐射的时空波动(在不断变化的泡沫体积中多次散射),或通过分析 "聚合物-荧光团 "混合物发泡过程中的荧光反应(由荧光团吸收带的激光辐射泵浦),对泡沫的当前状态进行诊断。在散射激光中动态斑点的平均寿命与表征泡沫膨胀动态的通用参数之间建立了关系。研究还发现,已形成的孔壁中的波导效应对不断演变的泡沫的荧光响应有重大影响,导致荧光辐射在孔壁中的特征停留时间增加,从而增加了荧光响应中的诱导成分。
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来源期刊
Technical Physics
Technical Physics 物理-物理:应用
CiteScore
1.30
自引率
14.30%
发文量
139
审稿时长
3-6 weeks
期刊介绍: Technical Physics is a journal that contains practical information on all aspects of applied physics, especially instrumentation and measurement techniques. Particular emphasis is put on plasma physics and related fields such as studies of charged particles in electromagnetic fields, synchrotron radiation, electron and ion beams, gas lasers and discharges. Other journal topics are the properties of condensed matter, including semiconductors, superconductors, gases, liquids, and different materials.
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