Near-Infrared Light-Induced Sequential Shape Recovery and Separation of Assembled Temperature Memory Polymer Microparticles.,Macromolecular Rapid Communications

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Near-Infrared Light-Induced Sequential Shape Recovery and Separation of Assembled Temperature Memory Polymer Microparticles.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-03-17 , DOI: 10.1002/marc.202000043
Cihui Zhou _{1,

2,

3} , Yaru Ni _{1,

2,

3} , Wenting Liu _{1,

2,

3} , Bin Tan ₄ , Mengchen Yao _{1,

2,

3} , Liang Fang _{1,

2,

3} , Chunhua Lu _{1,

3} , Zhongzi Xu _{1,

2,

3}

Affiliation

Light-induced, shape-changing polymeric microparticles have many applications. Here, the near-infrared (NIR)-light-triggered sequential recovery and separation of assembled large and small polymer microparticles using cross-linked blends of poly(ethylene-vinyl acetate) and trans-polyisoprene as temperature memory polymers as well as two NaYF4 based up-conversion nanoparticles (UCPs) to provide luminescent and photothermal effects are reported. Under irradiation of NIR light with a low light power density, small particles assembled onto the compressed large one recover first due to the low switching temperature (Tsw ) arising from the temperature-memory effect. The small particles can separate from the underlying large particle in flowing aqueous media. The recovery of the large particle occurs at a high power density. Two UCPs of NaYF4 : 20Yb, 0.2Tm, 5Gd and NaYF4 : 18Yb, 2Er, 5Gd facilitate the detection of small and large microparticles via providing blue and green light emissions, respectively. This work can expand the applications of light-induced shape-changing polymer microparticles in the biomedical field, controlled catalysis, microfluidic devices, and so on.

中文翻译：

近红外光诱导的顺序形状恢复和组装的温度记忆聚合物微粒的分离。

光诱导的，可变形的聚合物微粒具有许多应用。在这里，使用聚（乙烯-醋酸乙烯酯）和反式聚异戊二烯作为温度记忆聚合物以及两种NaYF4的交联共混物，对近红外（NIR）光触发的顺序回收和分离组装的大和小聚合物微粒据报道，基于纳米级的上转换纳米粒子（UCP）可提供发光和光热效应。在具有低光功率密度的近红外光照射下，由于温度记忆效应产生的低开关温度（Tsw），组装在压缩大颗粒上的小颗粒首先恢复。在流动的水性介质中，小颗粒可以与下面的大颗粒分离。大颗粒的回收以高功率密度发生。NaYF4的两个UCP：20Yb，0。2Tm，5Gd和NaYF4：18Yb，2Er，5Gd分别通过提供蓝光和绿光发射来促进检测小微粒和大微粒。这项工作可以扩大光诱导形变聚合物微粒在生物医学领域，可控催化，微流体装置等方面的应用。

更新日期：2020-04-22

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