Design of asymmetric-adhesion lignin reinforced hydrogels with anti-interference for strain sensing and moist air induced electricity generator

Rapid preparation of a self-adhesive PAA ionic hydrogel using lignin sulfonate–Al3+ composite systems for flexible moisture-electric generators

“…For instance, Fu and co-workers developed a PAA hydrogel-based MEG that could induce an output voltage of 306 mV. 36 However, the authors did not clearly explain the mechanism of electricity generation. In addition, there are still some problems that limit the development and application of conventional PAA hydrogels, such as the need for prolonged heating for preparation (>60 °C, >3 h), the use of toxic cross-linkers ( N , N ′-methylenebisacrylamide), and poor mechanical properties.…”

Janus-type ionic conductive gels with single-sided adhesiveness prepared by a “one-step” method for strain/pressure sensors

“…The adhesion strength of Janus-type ionic conductive gels to the skin is referred to in the previously reported literature. 19 The nonadhesive side of the ionic conductive gel is fixed at the bottom of the column by double-sided tape, and a uniaxial tensile test with a speed of 6 mm min À1 is performed. Each group of samples was tested three times in parallel and averaged.…”

“…At present, there are also a few reports on the preparation of Janus gels. 18,19 For example, Wang et al 20 proposed using the cycle freezing thawing method to prepare Janus strain sensors assembled by two layers of adhesive polyvinyl alcohol/phytic acid (PVA/PA) and nonadhesive polyvinyl alcohol/polyaniline (PVA/PANI). The prepared strain sensor has the characteristics of low response time, reversible response and high sensitivity.…”

Bioinspired Hydrogels as Platforms for Life-Science Applications: Challenges and Opportunities

“…The reversible break/reformation of micelle-like aggregates upon stretching and the presence of high entangled system containing PEG and poly(acrylamide), and hydrophobic domains involving the alkyl terminal groups of PEG generate a dynamic network with super-stretchable properties and high toughness, suitable for flexible sensors, artificial skins, and drug delivery systems [152]. Wearable sensors were recently reported using PAA with cellulose whiskers, in presence of tannic acid and Fe 3+ in glycerol/water mixture [153] or PAA with lignin in CaCl 2 solution [154] for health detection, electronic skin, or human-machine interface.…”