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Related Concept Videos

Osmosis00:47

Osmosis

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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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What are Membranes?01:54

What are Membranes?

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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...
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What are Membranes?01:24

What are Membranes?

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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...
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Author Spotlight: Exploring Plasma Membrane Repair Mechanisms with Innovative Thermoplasmonic Puncturing
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Fast polydopamine coating on reverse osmosis membrane: Process investigation and membrane performance study.

Jianqiang Wang1, Hao Guo2, Xiaonan Shi2

  • 1Polymer and Composite Division, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo, PR China; Department of Civil Engineering, The University of Hong Kong, Hong Kong, China.

Journal of Colloid and Interface Science
|October 13, 2018
PubMed
Summary

A new fast polydopamine coating (fPDAc) method significantly reduces membrane coating time by 97%. This rapid coating enhances reverse osmosis membrane performance, offering a quicker alternative to traditional methods.

Keywords:
CoatingPolydopamineReverse osmosis

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Membrane surface modification is crucial for enhancing separation performance.
  • Conventional polydopamine coating is time-consuming.
  • Developing rapid and effective coating strategies is essential for industrial applications.

Purpose of the Study:

  • To introduce a novel fast polydopamine coating (fPDAc) strategy.
  • To accelerate the polydopamine deposition rate using sodium periodate (NaIO4).
  • To evaluate the impact of fPDAc on reverse osmosis membrane properties and performance.

Main Methods:

  • Utilized quartz crystal microbalance to measure deposition rates.
  • Compared fPDAc with conventional slow polydopamine coating (sPDAc).
  • Characterized surface properties (hydrophilicity, charge) and separation performance (NaCl rejection, water flux).

Main Results:

  • fPDAc reduced coating time by 97% for a target mass of 2000 ng/cm².
  • Both fPDAc and sPDAc increased surface hydrophilicity and reduced surface charge.
  • Low fPDAc deposition (<1000 ng/cm²) improved NaCl rejection with minimal flux loss.
  • Extensive fPDAc coating led to diminished rejection enhancement and severe permeability loss.

Conclusions:

  • The fPDAc method offers a significantly faster alternative to sPDAc for membrane coating.
  • Optimal performance is achieved with shorter fPDAc coating times (e.g., 4 minutes).
  • This rapid coating strategy presents a more efficient approach for membrane surface modification.