通过光学共振观察到有孔的交联聚合物的蒸汽诱导的负扩张
Kun Li1, Hiroshi Yamagishi1,2, Osamu Oki1,2
1Department of Materials Science, Institute of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
Journal of the American Chemical Society
|March 2, 2026
概括
半孔聚合物微球表现出负膨胀,在有机蒸汽吸收时收缩. 这种通过光学共振转移观察到的新型材料特性为响应式传感器应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术纳米技术
背景情况:
- 半孔材料为各种应用提供了很大的表面积.
- 聚合物微球是材料科学中的多功能构建块.
- 随着环境刺激改变尺寸的响应性材料具有显著的兴趣.
研究的目的:
- 合成和描述表现出负膨胀的半孔交叉链聚合物微球 (PMS).
- 研究在有机蒸汽吸收时观察到的收缩背后的机制.
- 探索这些微球在传感应用中的潜力.
主要方法:
- 使用乙烯基甘二甲酸盐 (EGDMA) 和 (+) - 烯作为模板进行乳液聚合.
- 使用2,2-dimethoxy-2-phenylacetophenone (DMPA) 作为启动剂进行光固化.
- 使用Brunauer-Emmett-Teller (BET) 表面积分析,扫描电子显微镜 (SEM),N2吸附异热体和用光发光谱学进行共聚焦显微镜的特征.
主要成果:
- 合成的PMS,BET表面积为193 m2/g.
- 在暴露于n-hexane蒸气后观察到PMS中可逆直径收缩 -2.2%.
- 证明蒸汽凝结诱导拉普拉斯压力,克服聚合物弹性并导致收缩.
- 利用尼罗河红色发光和低语画廊模式 (WGM) 光学共振用于现场监测收缩.
结论:
- 半孔交叉连接的聚合物微球可以在对有机蒸气的反应中经历显著的负扩张.
- 收缩机制归因于从中位孔内蒸汽凝结形成的内拉普拉斯压力.
- 嵌入的尼罗河红色的发光和WGM特性允许对这种维度变化的敏感检测,为新型蒸汽传感器铺平了道路.
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