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相关概念视频

Ion Exchange01:17

Ion Exchange

1.1K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.1K
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.8K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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基于尿素的印制聚合物主体具有可切换的阳离子偏好

Sudhirkumar Shinde1,2, Anil Incel1, Mona Mansour1

  • 1Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden.

Journal of the American Chemical Society
|May 20, 2020
PubMed
概括
此摘要是机器生成的。

本研究引入具有可切换酸盐或酸盐离子的分子印记聚合物 (MIP),使用小分子修饰剂实现. 这些先进的受体在宿主-客体化学中提供可调节的选择性.

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科学领域:

  • 主机与客人的化学关系
  • 超分子化学
  • 聚合物科学

背景情况:

  • 设计具有可切换离子偏好的人工受体是一个重大挑战.
  • 分子印记聚合物 (MIP) 为分子识别提供了多功能平台.

研究的目的:

  • 为氧离子开发具有外部可切换偏好的MIP.
  • 研究这些新型聚合物的印记机制和结合特性.

主要方法:

  • 使用功能性宿主单体的键介导印记.
  • H 核磁共振定位和 H-H 核磁共振噪声 (NOESY) 进行相互作用阐明.
  • 分子动态模拟和染色学研究以获得机械洞察力.

主要成果:

  • 这些MIP显示了酸 (PPA) 和酸 (PSA) 的选择性结合.
  • 通过改变修饰剂的酸度来实现酸与酸的可切换色谱保留率.
  • 在聚合物骨干中观察到高阶复合物形成和模板诱导的滴滴重复.

结论:

  • 开发的MIP通过外部开关显示可调节的氧离子选择性.
  • 这项研究提供了对聚合物配置和构造印记的机械见解.
  • 这项工作推动了智能主机-客户系统的设计,