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相关概念视频

Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
Control of Power Flow01:30

Control of Power Flow

There are several methods to control power flow in power systems:
Control Volume and System Representations01:16

Control Volume and System Representations

Two key frameworks are employed to analyze mass, energy, and momentum transfer: the control volume approach and the system approach. These frameworks offer different perspectives, depending on whether the focus is on a specific region in space (control volume approach) or a defined mass of fluid (system approach).
The control volume approach considers a stationary region in space through which fluid flows. This region is bounded by a control surface.  For instance, in the case of water flowing...
Conservation of Mass in Finite Cotrol Volume01:16

Conservation of Mass in Finite Cotrol Volume

The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.

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相关实验视频

Updated: Jun 29, 2026

Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
18:11

Microfluidic Chips Controlled with Elastomeric Microvalve Arrays

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微流体度操纵通过可控制的交流电流的电流.

Jingliang Lv1, Yulong Pei2, Jianqi Sun2

  • 1College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150042, China.

Micromachines
|November 27, 2025
PubMed
概括

这项研究介绍了一种高效的微流体方法,使用交流电化 (ACEO) 以在所需度下连续制备流体. 该技术为诸如药物疗效测试等应用提供了精确的控制.

科学领域:

  • 微流体学 微流体学
  • 电动运动学 电动运动学
  • 流体动力学 流体动力学

背景情况:

  • 精确的微流体制备对于蛋白质结晶和药物疗效研究至关重要.
  • 现有的方法可能缺乏效率或精确控制流体度.

研究的目的:

  • 提出一种高效的微流体方法,用于在目标度下连续制备流体.
  • 通过交流电化 (ACEO) 来研究度控制的基本机制.

主要方法:

  • 利用交流电化 (ACEO) 进行流体混合和度控制.
  • 开发了一个3D数值模型,将电,流和度场合起来,以分析ACEO.
  • 实验控制的流体特性和电气参数.

主要成果:

  • 通过ACEO驱动的混合,在出口处证明了精确的度调整.
  • 确定了关键影响参数:流体粘度,导电性,轴速度,电压和频率.
  • 通过调整ACEO强度来展示可调的混合性能和输出度.

结论:

  • 基于ACEO的微流体方法提供了高效和精确的连续液体制备.
  • 设备的简单性和精确的度操纵对于各种应用具有优势.
关键词:
交流电气天体的电气天体.度操纵 度操纵 操纵微流体学 在微流体学方面

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  • 了解参数的影响使得针对特定的微流体需求进行优化.