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Related Experiment Video

Updated: Jun 14, 2025

A Freeze-Thawing Method to Prepare Chitosan-Polyvinyl alcohol Hydrogels Without Crosslinking Agents and Diflunisal Release Studies

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Published on: January 14, 2020

Multifunctional Chitosan Nanofiber-Based Sponge Materials Using Freeze-Thaw and Post-Cross-Linking Method.

Madhurangika Panchabashini Horathal Pedige¹, Akihide Sugawara¹, Hiroshi Uyama¹

¹Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

|September 2, 2024

Summary

Researchers created a novel, eco-friendly porous sponge using chitosan nanofibers and dialdehyde carboxymethyl cellulose. This bio-based material offers excellent shape recovery, fire retardancy, and adsorption capabilities for diverse applications.

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Last Updated: Jun 14, 2025

A Freeze-Thawing Method to Prepare Chitosan-Polyvinyl alcohol Hydrogels Without Crosslinking Agents and Diflunisal Release Studies

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Published on: January 14, 2020

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Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions

Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions

Published on: May 24, 2018

Area of Science:

Materials Science
Polymer Chemistry
Biomaterials Engineering

Background:

Fabricating stable porous sponge materials via polymer cross-linking faces challenges in simultaneous phase separation and cross-linking.
Existing methods struggle with pore formation due to rapid polyionic complex precipitation.

Purpose of the Study:

To develop a straightforward, eco-friendly technique for creating stable porous sponge materials from natural-based polymers.
To overcome the limitations of conventional pore-forming methods in polymer composite fabrication.

Main Methods:

Utilized a facile freeze-thaw method combined with subsequent cross-linking of chitosan nanofibers (CSNFs) and dialdehyde carboxymethyl cellulose (DACMC).
Employed ice crystals as a rigid template to control pore formation, avoiding rapid polyionic complex precipitation.

Main Results:

Developed a bio-based porous sponge material with remarkable shape recoverability in the wet state and stable porosity in the dry state.
The composite material exhibited superior fire retardancy and thermal insulation compared to commercial foams.
Demonstrated effective adsorption capacities for both cationic and anionic dyes and metal ions.

Conclusions:

The integrated freeze-thaw and cross-linking technique offers a promising approach for fabricating multifunctional porous materials from bio-based polymers.
This method addresses key challenges in porous material fabrication, paving the way for diverse industrial applications.