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相关概念视频

Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Gas Chromatography: Introduction01:13

Gas Chromatography: Introduction

Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
In GC,  a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a column.
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...

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相关实验视频

Updated: Jul 12, 2026

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
07:32

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates

Published on: January 17, 2018

结合聚合物薄膜用于气体分离.

M R Anderson, B R Mattes, H Reiss

    Science (New York, N.Y.)
    |June 7, 1991
    PubMed
    概括

    聚氨酸膜具有异常的气体选择性,在/和二氧化碳/甲等关键气体对中显著优于现有的材料. 这一突破为先进的气体分离技术提供了潜力.

    科学领域:

    • 材料科学 材料科学 材料科学
    • 聚合物科学 聚合物科学
    • 化学工程是化学工程的重要组成部分.

    背景情况:

    • 气体分离膜对于各种工业过程至关重要.
    • 现有的聚合物膜往往难以同时实现高选择性和透性.
    • 像聚氨这样的合聚合物为膜应用提供了独特的电子和结构性质.

    研究的目的:

    • 为了研究聚亚尼林薄膜的气体透性质.
    • 为了评估聚亚尼林膜对重要气体对的气体选择性.
    • 通过聚合物修饰来探索调整膜性能的方法.

    主要方法:

    • 制造独立的聚尼林薄膜.
    • 使用各种气体对 (H2/N2,O2/N2,CO2/CH4) 测量气体透性和选择性.
    • 通过对不同大小的对抗体进行兴奋剂和脱兴奋剂来改变聚氨膜特性.

    主要成果:

    • 聚亚尼林膜对H2/N2 (3590),O2/N2 (30),和CO2/CH4 (336) 具有显著的选择性.
    • 这些选择性值明显超过了非合聚合物所报告的选择性值.
    • 定制透性包括通过受控的兴奋剂增强小气体的运输和减少较大的气体的运输.

    更多相关视频

    Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
    07:45

    Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

    Published on: August 16, 2018

    相关实验视频

    Last Updated: Jul 12, 2026

    Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
    07:32

    Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates

    Published on: January 17, 2018

    Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
    07:45

    Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

    Published on: August 16, 2018

    结论:

    • 聚氨酸是高性能气体分离膜的一个有前途的材料.
    • 兴奋剂/无兴奋剂过程通过改变聚合物形态来有效调整膜选择性.
    • 这些发现表明,有可能开发基于合聚合物的通用膜用于气体分离.