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関連する概念動画

Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Colloidal precipitates01:09

Colloidal precipitates

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...

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関連する実験動画

Updated: Jul 8, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

反応性のあるコアシェルのヒドロゲルナノ粒子におけるインターフェイス非放射性エネルギー転送.

D Gan1, L A Lyon

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA.

Journal of the American Chemical Society
|August 23, 2001
PubMed
まとめ

非放射性エネルギー伝達 (NRET) は,光子相関スペクトロスコーピー (PCS) と異なり,熱反応性ポリ-N-イソプロピラクリラミド (p-NIPAm) マイクロゲル粒子の第一次元の相移行を明らかにします. NRETは,ナノ構造の材料を検出するための分子規模の探査機を提供しています.

科学分野:

  • ポリマーサイエンスの科学
  • マテリアルサイエンス 材料科学
  • 物理化学 物理化学

背景:

  • ポリ-N-イソプロピラクリラミド (p-NIPAm) のような熱反応性ポリマーには,温度変化に伴い体積相変異が表れます.
  • コアシェルのマイクロゲル粒子は,高度なアプリケーションのために調整可能な性質を提供します.
  • フォトン相関スペクトロスコーピー (PCS) と非放射性エネルギー伝送 (NRET) は,ポリマーの振る舞いを研究する技術です.

研究 の 目的:

  • 光で標識されたp-NIPAmコアシェルのマイクロゲル粒子を合成し,特徴づけるために.
  • PCSとNRETを用いてこれらの粒子の相変化行動を比較する.
  • 殻の厚さの影響が相変化の特徴に及ぼす影響を調査する.

主な方法:

  • コア・シェルラテックス粒子の合成で,コヴァラント的に局所化されたフェナントレン (ドナー) とアントラセーン (受容体) を用いる.
  • 光子相関スペクトロスコーピー (PCS) を使用して,粒子の脱水をモニターします.
  • 非放射性エネルギー伝送 (NRET) の効率を用い,粒子崩壊を検出する.

主要な成果:

  • PCSは,p-NIPAm粒子の連続的な (第1位ではない) 段階移行を示した.

さらに関連する動画

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

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Tethered Bilayer Lipid Membranes to Monitor Heat Transfer between Gold Nanoparticles and Lipid Membranes
07:33

Tethered Bilayer Lipid Membranes to Monitor Heat Transfer between Gold Nanoparticles and Lipid Membranes

Published on: December 8, 2020

関連する実験動画

Last Updated: Jul 8, 2026

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

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07:33

Tethered Bilayer Lipid Membranes to Monitor Heat Transfer between Gold Nanoparticles and Lipid Membranes

Published on: December 8, 2020

  • NRETの測定は,より狭い温度範囲で不連続 (第一位) の相変遷を明らかにした.
  • NRETは,殻の厚さが増加するにつれて,崩壊温度が上昇することを示したが,PCSはそうしなかった.

    • 結論:

    • PCSとNRETの間の明らかな矛盾は,交叉リンク器の不均一性による放射線相共存によって説明される.
    • NRETは,ナノ構造のマイクロゲルのための感受性の高い分子スケールプローブとして機能します.
    • この発見は,マイクロゲルシステムの詳細な特徴づけのためのNRETの可能性を強調しています.