Gum Arabic-based three-dimensional printed hydrogel for customizable sensors.

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• 3D printed hydrogels face challenges in writability and curing due to non-ideal rheological properties.
• Developing hydrogels with precise control over shape stability and mechanical integrity is crucial for advanced applications.

Purpose of the Study:

• To develop a 3D printable hydrogel with enhanced rheological properties for direct ink writing (DIW) at human body temperature.
• To create customizable hydrogel sensors with high sensitivity for strain and temperature monitoring.

Main Methods:

• Utilized silicon dioxide (SiO2) and Gum Arabic (GA) to create Bingham fluid properties for shape stability.
• Employed a rapid initiation system (potassium persulfate (KPS) and N,N,N',N'-tetramethylethylenediamine (TMEDA)) for transient cross-linking.
• Formulated hydrogel precursor with acrylamide (AAM) and lauryl methacrylate (LMA) for improved mechanical properties.

Main Results:

• Achieved DIW at temperatures similar to human body (30°C) with transient cross-linking in 10 seconds.
• Developed 3D printed hydrogel sensors demonstrating high sensitivity for strain detection (0-20%) and temperature sensing (0-80°C).
• The hydrogel precursor exhibited favorable rheological properties characteristic of Bingham fluids.

Conclusions:

• The developed 3D printed hydrogel overcomes limitations in writability and curing for DIW applications.
• The resulting hydrogel sensors possess excellent strain and temperature sensitivity, suitable for flexible wearable devices.
• This technology holds significant promise for advancements in medical monitoring and wearable electronics.