Search

Organohydrogel‐based strain sensors have gained increasing attention in the fields of real‐time healthcare and motion detection due to their excellent flexibility, stretchability, and skin‐like compliance. However, the fundamental attributes, such as mechanical elasticity, self‐adhesiveness, and biocompatibility, are challenging to be simultaneously obtained in organohydrogels, limiting their applications in wearable electronics. Additionally, traditional organohydrogels need to be fixed to the surface of the human skin and suffer from inferior breathability, resulting in complicated operations and severe uncomfortableness, respectively. Herein, a multifunctional organohydrogel is designed for wearable strain sensor by a facile digital light processing (DLP) 3D printing technology. By rationally tailoring the chemical (poly(N‐acryloylmorpholine)/poly(ethylene glycol) diacrylate) and physical (poly(N‐acryloylmorpholine)/poly(ethylene glycol) diacrylate and glycerin/water) cross‐linking networks, the organohydrogel exhibits promising water absorption/retention, high stretchability, impressive elasticity, and promising fatigue resistance. Additionally, good ionic conductivity, inherent self‐adhesiveness, and biocompatibility are simultaneously achieved. On the basis of the multifunctionalities, 3D multihole organohydrogels are designated as wearable and breathable strain sensors, facilitating the manipulation without any fixation and increasing the wear comfortableness. It is believed that 3D printed multihole organohydrogels show great potential in wearable flexible electronics. [ABSTRACT FROM AUTHOR]

Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering. [ABSTRACT FROM AUTHOR]