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関連する概念動画

Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

18.4K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

944
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
944
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
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...
3.6K
Precipitation Processes01:12

Precipitation Processes

584
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
584
Colloidal precipitates01:09

Colloidal precipitates

747
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
747
Types of Coprecipitation01:10

Types of Coprecipitation

864
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
864

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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マルチコンポーネントコンデンサート形態の制御 添加物調節相互作用

Jiahui Wang1, Arash Nikoubashman2,3,4, Young C Kim5

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States.

JACS Au
|August 29, 2025
PubMed
まとめ

細胞組織に不可欠な 生物分子凝縮物の形状を制御できます この研究は,分子相互作用と比率を調節することで,凝縮物の構造と機能に対する予測可能な制御が可能であることを明らかにしています.

キーワード:
添加物異型相互作用同型相互作用形態学的移行多成分コンデンサ小さな分子

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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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科学分野:

  • バイオ物理学
  • 細胞生物学
  • コンピュータ生物学

背景:

  • 生物分子凝縮物は細胞内組織と生化学的プロセスを調節する.
  • 小粒子は凝縮相分離と形態学に影響することが知られている.
  • 小分子媒介による凝縮物構造調節のメカニズム的な理解は限られている.

研究 の 目的:

  • 小分子コソルトが2つの成分からなる生物分子凝縮物の形態を調節する方法を研究する.
  • これらの形態学的変化を理解するための分子レベルの枠組みを確立する.
  • コンデンサートの構造を合理的に調整するための洞察を提供します.

主な方法:

  • 粗い粒子の分子動力学シミュレーション
  • 小分子とマクロ分子の相互作用強度の体系的な変化
  • 効果的な相互作用を分析するために,第2のバイリアル係数の計算.

主要な成果:

  • 観察された形態学的移行 (例えば,コア・シェル,脱水) は,小分子相互作用を変化させることによる.
  • ステキオメトリーと相互作用強度がコンデンサート形態を共同で決定することを示した.
  • 完全に混合されたコンデンサートは,小分子添加で微相分離構造に移行できることを示した.

結論:

  • コンデンサート形態は,相互作用とステキオメトリーに依存するメカニズムを通じて合理的に調節することができます.
  • 小分子コソルトは,分子レベルで凝縮物の構造を制御する手段を提供します.
  • 小分子による凝縮物調節に関する分子規模の洞察が得られる.