関連する実験動画
Updated: Jan 20, 2026
10:55
Digital Microfluidics for Automated Proteomic Processing
Published on: November 6, 2009
13.0K
電子微流体のためのイオン表面活性剤媒介の電解湿
Jia Li1, Noel S Ha2,3, Tingyi 'Leo' Liu1,4,5
1Mechanical and Aerospace Engineering Department, University of California, Los Angeles (UCLA), Los Angeles, CA, USA.
Nature
|August 23, 2019
まとめ
この研究では,従来の電気浸潤とは異なり,低電圧で液体の滴を移動させ,表面から濡らすことによって,デジタルマイクロ流体の新しい方法である電気浸潤を導入しています. これはよりシンプルで信頼性の高いマイクロ流体プラットフォームを提供します.
科学分野:
- マイクロ流体
- 表面科学
- 材料科学
背景:
- デジタルマイクロフリウジックは,様々な用途の電気信号によるドロップレット操作を可能にします.
- エレクトロウェッティング・オン・ダイエレクトリック (EWOD) は,高電圧 (約. 100V) と特殊なコーティング.
- EWODは 介電障害,電気充電,生物汚染などの 信頼性の問題に直面しています
研究 の 目的:
- 電気信号を用いた新しいドロップレット操作メカニズムを実証する.
- 液滴制御を実現するには,電気浸湿装置 (EWOD) に頼らない必要があります.
- よりシンプルで信頼性の高いマイクロ流体プラットフォームを確立する.
主な方法:
- 補足層のない水性伝導基板を用いた電解メカニズムを開発した.
- 電気信号を用いて液体を濡らします
- 基板にイオン表面活性物質の結合と分離を研究した.
主要な成果:
- 空気中のドープされたシリコンウエーフェルの電流浸潤を用いたドロップレット操作が成功しました.
- 低駆動電圧 (±2.5V) と最小電流 (マイクロアンペア) ですべての基本的なデジタルマイクロ流体操作を達成した.
- 低離子表面活性剤濃度で水,一般的なバッファ,有機溶媒を処理するシステムの能力を示した.
結論:
- 電気滴の操作に根本的に異なる,そして潜在的により堅牢なアプローチを提供します.
- 低電圧とシンプルな設定は,多機能で信頼性の高いマイクロ流体プラットフォームを約束します.
- この方法は,診断,光学,電子学の応用を大幅に進める可能性があります.
関連する概念動画
03:10Ionic Radii
33.3K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.3K
00:42Ionic Bonds
129.1K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
129.1K
02:54Molecular and Ionic Solids
19.9K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
19.9K
02:55Solubility of Ionic Compounds
68.0K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.0K
02:42Ionic Crystal Structures
16.9K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.9K
03:34Ionic Compounds: Formulas and Nomenclature
86.1K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
86.1K