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Videos de Conceptos Relacionados

Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
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Two Components: Liquid–Liquid Systems

A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Published on: March 13, 2013

Análisis espectroscópico de las interfaces líquido/líquido en microflujos multifásicos.

Akihide Hibara1, Masaki Nonaka, Manabu Tokeshi

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.

Journal of the American Chemical Society
|December 5, 2003
PubMed
Resumen

La espectroscopia microscópica de dispersión láser cuasi elástica (muQELS) permite el análisis de interfaces en microfluidos. Esta técnica midió el transporte y la adsorción en las interfaces de líquidos, determinando la energía libre interfacial para sistemas miscibles.

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Área de la Ciencia:

  • Química Física es la química física.
  • Ingeniería Química Ingeniería Química.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • El análisis de los fenómenos interfaciales en los sistemas microfluídicos es crucial para comprender los procesos de transporte y reacción.
  • Los métodos existentes pueden tener limitaciones en la caracterización del comportamiento interfacial dinámico a escala microscópica.

Objetivo del estudio:

  • Desarrollar y validar la espectroscopia microscópica de dispersión láser cuasi elástica (muQELS) para el análisis de interfaces en microcanales.
  • Para investigar los fenómenos de transporte y la cinética de adsorción de un quelato metálico en una interfaz agua/tolueno.
  • Para determinar la energía libre interfacial de una interfaz miscible agua/metanol.

Principales métodos:

  • Se empleó la espectroscopia de dispersión láser cuasi elástica microscópica (muQELS).
  • Las mediciones se llevaron a cabo en el microflujo multifase laminar dentro de un microcanal.
  • Los experimentos específicos se centraron en el transporte y la adsorción de quelatos metálicos, y la caracterización de la interfaz agua/metanol.

Principales resultados:

  • muQELS midió con éxito los fenómenos de transporte de un quelato metálico a través de una interfaz agua/tolueno.
  • Se cuantificó la adsorción transitoria del quelato metálico durante la fase inicial de transporte.
  • La energía libre interfacial de una interfaz miscible agua/metanol se determinó por primera vez utilizando muQELS.

Conclusiones:

  • La espectroscopia muQELS es una herramienta poderosa para analizar los fenómenos interfaciales en sistemas microfluídicos.
  • La técnica proporciona información sobre el transporte, la adsorción y la energía libre interfacial tanto de las interfaces inmiscibles como de las miscibles.
  • muQELS es altamente eficaz para investigaciones fisicoquímicas, estudios de mezcla y análisis de procesos elementales de reacciones heterogéneas.