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相关概念视频

Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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能实现高效机械发电的亚交联双网水凝

Zhi Jian Wang1, Julong Jiang2, Qifeng Mu1

  • 1Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan.

Journal of the American Chemical Society
|February 11, 2022
PubMed
概括

研究人员通过结合阿佐交联剂来增强双网络水凝. 这大大促进了机械制造,使得柔软机器人等领域对应力材料的应用更广泛.

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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科学领域:

  • 材料科学
  • 聚合物化学
  • 机械化学

背景情况:

  • 双网络 (DN) 水凝通过强力分裂产生机械基.
  • 这些机械基可以触发现场聚合,改善材料特性.
  • 增加DN凝中的机械基度扩大了它们的潜在应用.

研究的目的:

  • 在DN水凝中增强机械基生成.
  • 调查阿佐交联剂对机械度和特性的影响.
  • 探索应力DN凝的新应用.

主要方法:

  • 将阿佐交联剂纳入第一个DN水凝网络.
  • 机械测试以评估产量应力和强力诱导的基质生成.
  • 与传统的N,N'-甲基二胺交叉连接剂进行比较.

主要成果:

  • 亚索交联剂降低了产量压力,但显著增加了机械度 (高达5倍).
  • 最大机械度达到了约220μM.
  • 具有阿佐交联剂的DN凝在激素生成方面表现出更高的能量效率.
  • 混合交叉连接系统也显示出极好的基因生成.

结论:

  • 在DN水凝中,阿佐交叉连接剂有效地促进机械基生成.
  • 增强的基质生成加速了聚合并扩大了应用.
  • 对于生物医疗设备和软机器人来说,