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Adhesion

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...

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Updated: Nov 2, 2025

Insertion of Flexible Neural Probes Using Rigid Stiffeners Attached with Biodissolvable Adhesive

Insertion of Flexible Neural Probes Using Rigid Stiffeners Attached with Biodissolvable Adhesive

Published on: September 27, 2013

A Smart Patch with On-Demand Detachable Adhesion for Bioelectronics.

Xiaofang Shi¹, Peiyi Wu^1,2

¹State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

|June 9, 2021

Summary

This summary is machine-generated.

A novel biomimetic hydrogel skin patch offers advanced physiological monitoring. This smart wearable device precisely detects and differentiates multiple signals like temperature and pressure simultaneously, ensuring biosafe, on-demand adhesion.

Keywords:

multiple response physiological diagnose signal distinguishing tunable adhesivity

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Last Updated: Nov 2, 2025

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Published on: September 27, 2013

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Bridging the Bio-Electronic Interface with Biofabrication

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Published on: June 6, 2012

Area of Science:

Materials Science
Biomedical Engineering
Wearable Technology

Background:

Existing ionic skin patches struggle with simultaneous signal differentiation and can cause secondary tissue damage upon removal.
Need for advanced wearable biosensors with improved safety and multi-signal detection capabilities.

Purpose of the Study:

To develop a multifunctional, biomimetic hydrogel with tunable adhesion for enhanced physiological signal monitoring.
To create a biosafe skin patch capable of simultaneously distinguishing diverse physical and chemical signals.

Main Methods:

In situ polymerization of hydrophilic anion monomers within a natural cationic polysaccharide to form ionic channels.
Utilized a reversible physical cross-linked network and thermosensitivity for tunable hydrogel properties.
Fabricated a smart skin patch for monitoring pressure, temperature, pH, and electrocardiograph signals.

Main Results:

The developed hydrogel exhibits tunable mechanical properties, adhesion, and visual effects via phase transition.
The ionic skin patch accurately recognizes temperature changes across broad and narrow ranges.
Simultaneous real-time recognition and differentiation of pressure and temperature signals were achieved.

Conclusions:

A novel, multifunctional biomimetic hydrogel serves as a biosafe, smart skin patch for advanced human-machine interfaces.
The hydrogel's responsive properties enable precise, simultaneous monitoring of multiple physiological signals, overcoming limitations of current technologies.