超分子网络具有高剪切硬化,由金属离子介导的键增强策略使之成为可能
Zhuo Chen1, Heng Chen1,2, Yuxi Li1,3
1Materials Artificial Intelligence Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China.
Nature communications
|October 8, 2025
概括
这项研究引入了一种新的无剪切硬化凝 (SSG),使用聚二氧化. 这种先进的SSG提供了优越的冲击保护,降低了毒性和腐蚀.
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:
- 传统的基剪切硬化凝 (SSG) 显示出有前途的冲击保护特性,但受到酸诱导的毒性和腐蚀的限制.
- 需要先进的SSG,具有增强的安全配置和可比或优越的机械性能.
研究的目的:
- 设计和合成一种基于超分子动态可逆网络的新型无剪切硬化凝 (SSG).
- 通过金属离子介导的联结合来研究剪切硬化增强的机制.
- 评估新的SSG在冲击保护和传感器应用中的性能.
主要方法:
- 通过金属离子介导的结合策略合成了一个聚乙氧化 (PTS) 网络.
- 分析了不同氧化状态 (Ti4+和Ti3+) 对键强度的影响.
- 机械性质,包括剪切硬行为,腐蚀和细胞毒性,是特征.
主要成果:
- 开发的聚乙氧SSG表现出异常的剪切硬化能力,在0.1-100赫兹的频率范围内增加约2800倍.
- 无的SSG呈现微不足道的腐蚀和低细胞毒性,符合1级标准.
- 该材料显示出在冲击保护和灵活的机械传感器方面具有实际应用的潜力.
结论:
- 通过金属离子介导的结增强策略,有效地产生了强大的,无的SSG,具有出色的剪切加厚特性.
- 开发的PTS SSG提供了一个比传统的基SSG更安全,更环保的替代方案,用于冲击保护.
- 这种方法为为先进的智能材料设计下一代动态可逆网络提供了一条途径.
相关概念视频
02:51Metal-Ligand Bonds
24.0K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.0K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
797
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
797
01:19Complexation Equilibria: The Chelate Effect
1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.2K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.8K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.8K