新型多孔凝胶遇目标分子变色收缩变硬 | Novel Porous Gel Changes Color, Shrinks and Hardens When Detecting Target Molecules

Source: Phys.org — May 25, 2026
Published in: Journal of the American Chemical Society DOI: 10.1021/jacs.6c06620

🔬 English Summary

Kyoto University and Tohoku University researchers developed a novel porous polymer gel called MOPEG gel that can detect specific target molecules and respond with visible, macroscale changes.

Key Innovations

Aspect	Detail
Structure	Metal–organic polyhedra (MOPs) + flexible PEG polymer chains
Recognition mechanism	Coordination chemistry (metal centers ↔ electron-rich guest molecules) — not typical hydrogen bonding
Visual response	Color change: green → red upon detecting target molecules
Physical response	Gel shrinks in volume and hardens (stiffness increases dramatically)
Selectivity	Only molecules with multiple coordinating nitrogen atoms trigger the response

How It Works

MOPs act as both structural junctions in the polymer network and molecular recognition sites. When target molecules (with multiple coordinating nitrogen atoms) enter the gel, they bridge neighboring MOP units through coordination "handshakes," reinforcing the internal network — translating invisible molecular interactions into visible color change, shrinkage, and hardening.

Why It Matters

This establishes a synthetic platform that bridges molecular selectivity and macroscale deformation, opening possibilities for next-generation smart materials that can sense, adapt, and mechanically respond to chemical environments — potentially useful for chemical sensors, drug delivery, and programmable soft matter.

🔬 中文摘要

京都大学和东北大学的研究人员开发了一种名为 MOPEG 凝胶的新型多孔聚合物凝胶，能够在检测到特定目标分子后产生可见的宏观响应。

核心创新

方面	详情
结构	金属有机多面体 (MOPs) + 柔性聚乙二醇 (PEG) 链
识别机制	配位化学（金属中心 ↔ 富电子客体分子）——而非传统的氢键作用
视觉响应	检测到目标分子后颜色从绿色变为红色
物理响应	凝胶体积收缩且硬度显著增加（变硬）
选择性	只有含多个配位氮原子的分子才会触发响应

工作原理

MOP 同时充当聚合物网络的结构节点和分子识别位点。当目标分子（含多个配位氮原子）进入凝胶后，它们通过配位"握手"桥接相邻 MOP 单元，加固内部网络——将不可见的分子间作用转化为可见的变色、收缩和硬化。

意义

该研究建立了一个连接分子选择性与宏观形变的合成平台，为下一代智能材料开辟了方向——能够感知、适应并对化学环境做出机械响应，有望应用于化学传感器、药物递送和可编程软物质等领域。

Posted: 2026-05-25