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Network Covalent Solids02:18

Network Covalent Solids

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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...
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Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.1K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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レコード孔口を持つ共性有機フレームワーク

Zhenjie Mu1, Yuhao Zhu1, Bixiao Li1

  • 1Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, Advanced Technology Research Institute (Jinan), Frontiers Science Center for High Energy Material, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

Journal of the American Chemical Society
|March 8, 2022
PubMed
まとめ
この要約は機械生成です。

研究者は10.0nmまでの記録的な大きさの均一なメソポールを持つ新しい共性有機フレームワーク (COF) を開発しました. これらの安定した結晶物質は ペプシンのような大きな生物分子の分離を可能にし 酵素を保護します

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科学分野:

  • 材料科学
  • ポリマー化学
  • ナノテクノロジー

背景:

  • 分子分離と保護には 調整可能な孔を持つ有孔物質が不可欠です
  • 既存の金属有機フレームワーク (MOF) と共性有機フレームワーク (COF) は,孔口のサイズに制限があり,大きな分子へのアクセスを妨げています.
  • 結晶性多孔ポリマーの均一で大きなメソポールを達成することは依然として大きな課題です.

研究 の 目的:

  • 記録的なメソポールの開口を備えた新しい共性有機フレームワーク (COF) を構築する.
  • 大きな孔を持つCOFの形成における相互浸透性と構造的脆弱性の限界を克服する.
  • 大量のバイオ分子を含む実用的な応用において,これらの新しいCOFの有用性を実証する.

主な方法:

  • 強化された形状の硬さ,平行性,制御された局所的極性を持つ新しい構成要素の設計と合成.
  • 結晶性,多孔性,安定性,および毛穴サイズ分布について,結果として得られた共性有機フレームワーク (COF) の特徴づけ.
  • 合成されたCOFを生物分子の分離と酵素保護に使用する.

主要な成果:

  • 7. 7から10. 0 nmまでの孔口値で,一連の共性有機フレームワーク (COF) が成功裏に合成され,以前の記録を上回りました.
  • 採取されたCOFは高結晶性,恒久的多孔性,構造的安定性,そして重なりやすい堆積を示した.
  • 粗混合物からペプシン (約7nm) を分離し,熱による変性からチロシナーゼを保護することが実証された.

結論:

  • 開発された戦略は,前例のない大規模で均一なメソポールの共性有機フレームワーク (COF) の構築を可能にします.
  • これらの新しいCOFは,高度な分離技術と生物分子の安定化に重要な可能性を秘めています.
  • この発見は 複雑な分子相互作用のための 次世代の多孔性の材料を 設計するための道を開きます