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相关概念视频

Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
Cohesion01:07

Cohesion

Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a surface,...
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Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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基于凝的颗粒状水凝支架中的多层结构-属性关系

Arian Jaberi1, Yuanhui Xiang1, Amir Sheikhi1,2,3,4,5

  • 1Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

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基于凝的颗粒型水凝支架 (GHS) 通过分层设计提供可调节的特性,从分子化学到微凝组装. 这使得用于先进的生物医学应用的脚手架架构能够得到精确的控制.

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科学领域:

  • 生物材料科学 生物材料科学
  • 组织工程是组织工程.
  • 聚合物化学 聚合物化学

背景情况:

  • 颗粒状水凝支架 (GHS) 是由相互连接的水凝颗粒 (微凝) 构成的宏生物材料.
  • 凝及其衍生物是GHS中常见的宏分子,因为它们已建立的生物和物理化学特性.
  • GHS具有层次结构,从微凝中的纳米级聚合物网络到宏观级间隙孔.

研究的目的:

  • 要突出凝化学,微凝设计和脚手架组装如何调节基于凝的GHS的行为.
  • 在分子,微型和宏观尺度上绘制结构-属性关系.
  • 确定用于生物医学应用的GHS合理设计的机会.

主要方法:

  • 分子级别的凝化学影响交叉连接,降解和生物活性的分析.
  • 评估影响GHS属性的微型粒子设计因素 (大小,稳定性,形状,刚性).
  • 评估宏观架构组装及其对孔隙结构和细胞透的影响.

主要成果:

  • 凝的分子组成决定了微凝的稳定性和机械性能.
  • 微凝特性 (大小,刚度,孔隙性) 控制GHS孔隙结构和机械完整性.
  • 层次设计允许对GHS结构和功能属性的模块化控制.

结论:

  • 基于凝的GHS通过层次设计提供可调节的特性,跨越分子到宏观尺度.
  • 优化的GHS设计可促进细胞透和组织集成,用于诸如血管化和再生等应用.
  • 了解结构-属性关系使GHS的合理设计能够用于各种生物医学用途.