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相关概念视频

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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薄膜在弱相互作用的基质上生长的非单调粗性演变.

Dmitry Lapkin1, Ismael S S Carrasco2,3, Catherine Cruz Luukkonen1

  • 1Eberhard Karls Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany.

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概括

薄膜沉积在弱相互作用的基板上显示出独特的粗至平滑的生长模式. 这种现象,观察到不同的分子几何学,可以控制,以管理纳米级的薄膜粗度.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 表面科学是一门学科.
  • 纳米技术 纳米技术

背景情况:

  • 薄膜沉积在弱相互作用的基板上往往导致复杂的生长模式.
  • 最初的岛屿形成和越来越粗是这些系统的特征.
  • 随后的粗度下降,导致光滑的薄膜,是一个不太了解的现象.

研究的目的:

  • 在薄膜沉积中实验证明粗至平滑的生长模式.
  • 用几何模型解释这种生长模式的基本机制.
  • 通过动力蒙特卡洛模拟来验证这一现象的通用性.

主要方法:

  • 实验性薄膜沉积的巴克明斯特富勒伦 (C60) 和1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile. 这是一个非常简单的方法.
  • 开发一个多层岛屿生长和凝聚的几何模型.
  • 动力蒙特卡洛模拟包括吸附剂-吸附剂和吸附剂-基质相互作用.

主要成果:

  • 对于球状 (C60) 和圆盘状分子,试验证实了粗至平滑的生长模式.
  • 几何模型准确地描述了岛屿的生长,凝聚和连续膜的形成.
  • 动力蒙特卡洛模拟显示,这种模式一般适用于弱相互作用的基板.

结论:

  • 粗至平滑的生长模式是薄膜沉积在弱相互作用的基板上的通用现象.
  • 这项研究为控制纳米级薄膜粗度提供了一个框架.
  • 了解这些机制,可以根据特定的分子细节独立地定制膜特性.