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Dialysis01:15

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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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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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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Related Experiment Video

Updated: Aug 22, 2025

Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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Separating water isotopologues using diffusion-regulatory porous materials.

Yan Su1, Ken-Ichi Otake2, Jia-Jia Zheng3

  • 1State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, P. R. China.

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|November 9, 2022
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Summary

Researchers developed porous coordination polymers (PCPs) to efficiently separate water isotopologues like H2O and D2O at room temperature. Dynamic gates within the PCPs regulate guest traffic, enabling high separation factors for crucial applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Separating isotopologues, molecules with different isotopes, is crucial but challenging due to similar properties.
  • Water isotopologues (H2O, D2O, HDO) are vital in biology, industry, and medicine, yet difficult to separate.
  • Existing separation methods for water isotopologues are often inefficient or require extreme conditions.

Purpose of the Study:

  • To develop an efficient method for separating water isotopologues at room temperature.
  • To utilize porous coordination polymers (PCPs) with dynamic gate functionalities for isotope separation.
  • To achieve high separation factors for ternary mixtures of water isotopologues.

Main Methods:

  • Construction of two novel porous coordination polymers (PCPs) with dynamic gate mechanisms.
  • Investigating the adsorption and diffusion properties of water isotopologues within the PCPs.
  • Employing a kinetics-based vapor separation approach leveraging temperature-responsive adsorption.

Main Results:

  • The designed PCPs demonstrated efficient separation of water isotopologues at room temperature.
  • Dynamic gates within the PCPs amplified subtle differences in isotopologue diffusion rates.
  • Preferential adsorption of H2O vapor over D2O vapor was observed, leading to high H2O separation factors (~210).

Conclusions:

  • Porous coordination polymers with dynamic gates offer a promising strategy for efficient water isotopologue separation.
  • This method facilitates high-performance, temperature-responsive vapor separation of H2O/HDO/D2O mixtures.
  • The findings have significant implications for applications requiring pure water isotopologues.