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Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

Membrane Fluidity

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...

What are Membranes?

What are Membranes?

A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and Golgi...

What are Membranes?

What are Membranes?

A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...

Potentiometry: Membrane Electrodes

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Related Experiment Video

Updated: May 30, 2026

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

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

Published on: August 16, 2018

Zeolite membranes: microstructure characterization and permeation mechanisms.

Miao Yu¹, Richard D Noble, John L Falconer

¹Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424, USA. Miao.Yu@colorado.edu

Accounts of Chemical Research

|August 4, 2011

Summary

Zeolite membranes show flexible structures and adaptable defect sizes, crucial for molecular separations. Understanding these properties enhances their application in industrial separation processes.

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Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane

Published on: February 22, 2020

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Last Updated: May 30, 2026

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

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

Published on: August 16, 2018

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane

Published on: February 22, 2020

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Zeolites, synthesized since the 1940s, are known for catalysis, ion-exchange, and adsorption.
Zeolite membranes, developed in the 1990s, offer potential for molecular separations due to their uniform pores and stability.
Previous research faced challenges in understanding zeolite membrane microstructures and permeation mechanisms, hindering process design.

Purpose of the Study:

To characterize the microstructures of zeolite membranes.
To understand the fundamental adsorption and diffusion behavior of permeating solutes, especially for mixtures.
To correlate microstructure features with membrane performance for improved separation processes.

Main Methods:

In situ hydrothermal synthesis for zeolite membrane preparation.
Permeation experiments to study molecular transport.
X-ray diffraction and optical measurements to analyze membrane structure and flexibility.
Development of methods for measuring mixture adsorption and pure component adsorption in zeolite membranes.

Main Results:

Zeolite membrane structures exhibit flexibility, with defect sizes influenced by adsorption and temperature.
Changes in defect size significantly impact membrane permeation properties.
New methods were developed to quantify adsorption and diffusion behaviors in zeolite membranes and crystals.

Conclusions:

Understanding zeolite membrane microstructure and flexibility is key to optimizing separation performance.
The identified structure-property relationships can guide the design of advanced zeolite membranes.
This research facilitates the large-scale industrial application of zeolite membranes for efficient separations.