Supramolecular networks with high shear stiffening enabled by metal ion-mediated hydrogen bonding enhancement strategy.

IF 15.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2025-10-08 DOI:10.1038/s41467-025-64000-1

Zhuo Chen,Heng Chen,Yuxi Li,Binli Wang,Shuhan Chen,Zhi-Yan Chen,Qianhua Huang,Xue-Feng Yu,Rui He

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引用次数: 0

Abstract

Shear stiffening gel (SSG) with prominent rate-dependent mechanical properties is promising for impact protection, but conventional boron-based SSG suffers from toxicity and corrosion arising from boric acid. Here, we design a boron-free supramolecular dynamic reversible network of polytitanosiloxane (PTS) based on the metal-ion-mediated hydrogen bonding enhancement strategy. Different oxidation states of Ti atoms in the network influence the charge distribution of the adjacent hydroxyl groups (Ti-OH). The electrostatic potential of the H-bond donor and acceptor could be effectively modulated by the Ti4+ and Ti3+ cations, thereby enhancing the H-bond strength. The resulting PTS SSG exhibits exceptional shear stiffening (~2800 times, 0.1-100 Hz), negligible corrosion, and low cytotoxicity (Grade 1). The PTS SSG is further explored for impact protection materials and flexible mechanical sensors in practice. The hydrogen bonding enhancement strategy also paves the way for developing dynamic reversible networks to fabricate next-generation smart materials.

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金属离子介导的氢键增强策略使具有高剪切刚度的超分子网络成为可能。

剪切硬化凝胶（SSG）具有显著的速率相关力学性能，有望用于冲击防护，但传统的硼基SSG存在硼酸引起的毒性和腐蚀。本文设计了一种基于金属离子介导氢键增强策略的无硼聚钛硅氧烷（PTS）超分子动态可逆网络。网络中Ti原子的不同氧化态影响相邻羟基（Ti- oh）的电荷分布。Ti4+和Ti3+阳离子可以有效地调节氢键供体和受体的静电电位，从而提高氢键强度。由此产生的PTS SSG具有优异的剪切硬化（~2800次，0.1-100 Hz），可忽略的腐蚀和低细胞毒性（1级）。在实践中进一步探索了PTS SSG的冲击防护材料和柔性机械传感器。氢键增强策略也为开发动态可逆网络以制造下一代智能材料铺平了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.