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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Rise of Liquid in a Capillary Tube01:18

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
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High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
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High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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Distillation: Vapor–Liquid Equilibria01:01

Distillation: Vapor–Liquid Equilibria

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Updated: Feb 2, 2026

Fluorescence detection methods for microfluidic droplet platforms
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Fluorescence detection methods for microfluidic droplet platforms

Published on: December 10, 2011

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Microstructure-Enhanced Liquid⁻Liquid Extraction in a Real-Time Fluorescence Detection Microfluidic Chip.

Penghui Xiong1, Xiangyu Chen2, Ying Xiong3

  • 1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China. xph@mail.ustc.edu.cn.

Micromachines
|November 9, 2018
PubMed
Summary

This study introduces a microfluidic chip with enhanced liquid-liquid extraction for detecting trace compounds. Microstructures significantly boosted extraction efficiency, improving detection limits for environmental and biological specimens.

Keywords:
fluorescence detectionliquid–liquid extractionlithographymicrofluidic chip

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Biotechnology

Background:

  • Microfluidic systems are crucial for detecting environmental contaminants and biological specimens.
  • Limited detection capabilities of trace specimens hinder microfluidic chip applications.
  • Liquid-liquid extraction is vital for microfluidic preprocessing.

Purpose of the Study:

  • To develop a real-time fluorescence detection microfluidic chip.
  • To enhance liquid-liquid extraction efficiency using integrated microstructures.
  • To improve the detection limits for trace compounds in microfluidic devices.

Main Methods:

  • Development of a microfluidic chip integrating real-time fluorescence detection.
  • Implementation of microstructure-enhanced liquid-liquid laminar extraction.
  • Finite Element Method (FEM) simulation to validate microstructure effectiveness.
  • Experimental validation using Rhodamine 6G (Rh6g) fluorescence probe.

Main Results:

  • The developed microfluidic system achieved real-time monitoring and concentration of trace compounds.
  • Auxiliary microstructures significantly increased liquid-liquid extraction efficiency.
  • FEM simulations confirmed the efficiency enhancement provided by microstructures.
  • Microstructure-enhanced extraction efficiency was 350% higher than traditional laminar flow extraction.

Conclusions:

  • The combination of microfluidic chip and microstructure-enhanced liquid-liquid extraction is effective for trace compound enrichment.
  • This technique offers improved sensitivity for detecting environmental and biological specimens.
  • The developed system demonstrates a significant advancement in microfluidic analytical capabilities.