毛細な有機塩における巨大な負の線形圧縮性
Yu Zhao1, Changzeng Fan2, Cuiying Pei3
1Department of Chemistry , Jilin University , Changchun 130012 , China.
Journal of the American Chemical Society
|January 23, 2020
まとめ
研究者らは,巨大な負の線形圧縮性 (NLC) を有する新しい結晶性多孔有機塩 (CPOS-1) を発見しました. この材料は独特の水素結合により圧力下で膨張し,高度なNLCアプリケーションの可能性を秘めています.
科学分野:
- 材料科学
- 固体化学
- クリスタルグラフィー
背景:
- 負の線形圧縮性 (NLC) は,一般的な直感に反して,液体圧縮下で特定の方向に膨張する材料を記述します.
- 結晶材料のNLC特性は,その構造的幾何学と根本的に関連しています.
- NLCの行動に関する新しい有機物質の探索は,NLCアプリケーションの範囲を拡大するために不可欠です.
研究 の 目的:
- 重要なNLC特性を有する新しい結晶の多孔な有機塩 (CPOS-1) を発見し,特徴づけること.
- CPOS-1における観測された巨大なNLCの構造的起源を解明する.
- 圧力下でのこの材料のNLCの行動と陽子の伝導性の関係を調査する.
主な方法:
- 高圧X線分光実験は,圧縮下でCPOS-1の構造的反応を研究するために使用されました.
- 高圧電気化学阻力スペクトロスコーピー (EIS) を用いて,陽子の伝導性を探査した.
- 水素結合の相互作用の計算モデルと分析が行われました.
主要な成果:
- CPOS-1は, -90.7 TPa-1の圧縮性値 (Kc) を有する,巨大な負の線形圧縮性を表している.
- NLCの行動は,電荷強化されたN-H+··−S水素結合によって駆動される柔軟な"超分子スプリング"メカニズムに起因する.
- 高圧下では,NLCの行動と単結晶の陽子伝導性との相関が確立された.
結論:
- 発見されたCPOS-1は,例外的なNLC性能を持つ新しい有機物質を表しています.
- CPOS-1のユニークな水素結合ネットワークは,その"超分子スプリング"効果と巨大なNLCの鍵です.
- この研究は,特に有機システムにおけるNLCの研究と応用のための,安価で容易に入手可能な多孔な有機材料の可能性を強調しています.
関連する概念動画
Entropy and Solvation
8.1K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.1K
Osmosis and Osmotic Pressure of Solutions
45.5K
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
45.5K
Porosity and Absorption of Aggregate
670
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...
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...
670
Solubility
20.6K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
20.6K
Electrolytes: van't Hoff Factor
36.1K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
36.1K
Ionic Strength: Effects on Chemical Equilibria
2.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
2.4K


