関連する実験動画
Updated: Jun 17, 2026

06:45
Determining Surface Areas and Pore Volumes of Metal-Organic Frameworks
Published on: March 8, 2024
柔軟な多孔質固体における機能化: 毛穴の開口と宿主-ゲストの相互作用への影響
Thomas Devic1, Patricia Horcajada, Christian Serre
1Institut Lavoisier, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles cedex, France. devic@chimie.uvsq.fr
Journal of the American Chemical Society
|December 30, 2009
まとめ
研究者らは,変形した孔面を持つ機能化されたMIL-53 (((Fe) 金属-有機フレームワークを合成した. 毛穴開口の幾何学は,置換体サイズではなく,フレームワークの相互作用に関連しており,その1つの変数は,アクセス可能な毛穴性を示しています.
科学分野:
- マテリアルサイエンス 材料科学
- 化学 化学は化学です.
- ナノテクノロジー ナノテクノロジー
背景:
- メタル・オーガニック・フレームワーク (MOF) は,様々な用途に合わせて調整可能な特性を提供しています.
- MIL-53 ((Fe) は,ガスの貯蔵と分離の可能性のある柔軟なMOFです.
- MOFリンクヤーの機能化は,孔環境の体系的な修正を可能にします.
研究 の 目的:
- グラムスケールの柔軟な機能化された鉄テレフタラートMIL-53 (Fe) 固体を合成し,特徴づけること.
- MIL-53 (Fe) フレームワークと毛孔特性に対する様々な化学基体の影響を調査する.
- 毛孔開口の幾何学を,枠内相互作用と置換因子効果と相関させる.
主な方法:
- 機能化されたMIL-53 (Fe) 材料のグラムスケール合成.
- 構造分析のためのX線粉末 difraktion (XRPD) について.
- 分子シミュレーションとインシットIRと (57) Feのモッズバウアースペクトロメトリーによる特徴付け.
- 熱安定性評価のための熱重力測定分析 (TGA)
主要な成果:
- すべての合成された固体は,水分化状態と乾燥状態の両方で,原始のMIL-53 ((Fe)) に似た狭い孔状の形態を採用しました.
- 毛穴開口の幾何学は,主に置換物のステリック障害ではなく,枠内相互作用によって決定されます.
- MIL-53 (((Fe) - (((CF ((3)))) は,BETの表面積が約100m ((2) g ((-1)) のアクセス可能な多孔性を実証しました.
- 液体吸収は,ゲスト-フレームワークの相互作用によって影響された特定の毛孔開き行動を誘発しました.
結論:
- MIL-53 ((Fe) の体系的な機能化は,孔面の特性に対する制御を提供します.
- フレームワーク内の相互作用は,これらの柔軟なMOFにおける孔状の幾何学を決定する支配的な要因です.
- 分子シミュレーションで評価された狭い孔と大きな孔の間のエネルギー差は,観察された吸収行動を説明します.
関連する概念動画
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Pore Transport and Ion-Pair Transport
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
Pore Size Distribution
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...
Adequate...
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
Factors Affecting Dissolution: Particle Size and Effective Surface Area
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...

