Good day to all our readers,

I’m happy to announce that I’ve launched a free eBook that introduces hydrogels. I wrote it for the pre-university level in hopes that more people can get to know the practical uses of hydrogels.

I’ve shared it on Twitter as a lead magnet to attract more readers to our newsletter. Of course, not forgetting our early readers, I’m sharing the download link directly in your email.

In Brief

• Today we launched our first free eBook that introduces hydrogels to a pre-university audience.

• Two new research papers in the field of double network hydrogels and its applications.

Research Updates

Study of double network hydrogels based on sodium methacrylate alginate and carboxymethyl chitosan

• Double network hydrogels based on sodium methacrylate alginate and carboxymethyl chitosan were formed by covalent crosslinking and physical crosslinking in succession.

• Covalent crosslinking was achieved by using poly(ethylene glycol) diacrylate (PEGDA) as the crosslinker, while physical crosslinking was realized by the electrostatic interactions between the carboxyl group of MASA and the amino group of CMCS induced by acetic acid.

• The hydrogel has enhanced mechanical properties, high transparency, excellent water absorption rate, and pH sensitivity.

• Combination of covalent and physical crosslinking in the double network structure allows for improved mechanical strength while maintaining high water absorption.

• The hydrogel shows promising applications as a visual transdermal drug delivery system.

The preparation of double network hydrogel with high mechanical properties by photopolymerization under the green LED irradiation and enhancement of wet adhesion by tannic acid

• In this article, poly(acrylamide-co-acrylic acid)/sodium alginate (P(AAM-co-AAC)/SA) hydrogels were rapidly prepared by photopolymerization under green LED irradiation. Subsequently, poly(acrylamide-co-acrylic acid)/sodium alginate/tannic acid (P(AAM-co-AAC)/SA/TA) hydrogels were prepared by immersion method.

• The hydrogel has excellent mechanical properties, with an elongation at break of 862% and a tensile strength of 0.77 MPa.

• The hydrogel with tannic acid showed excellent adhesion, wet adhesion, and anti-swelling capability.

• Tannic acid is a natural substance that has a large amount of pyrogallol structure, which can generate strong adhesion.

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