Flexible
gel-based strain sensors have made remarkable progress,
emerging as promising candidates for wearable electronic devices.
Too much attention was paid to the sensing sensitivity of the conventional
gel sensors, and their environmental tolerance and green recyclability
were ignored. This work designs a high ion conductive, multienvironmentally
adaptable, and recyclable eutectogel, with gelatin-strengthened poly(vinyl
alcohol) (PVA) and deep eutectic solvent (DES) as the gelator and
disperser, respectively. Interestingly, the cross-linked network composed
of PVA and gelatin polymer molecules endows the eutectogel with an
ultimate tensile strength of 6.8 MPa. Moreover, the ionic liquid-like
characteristic of DES at room temperature and abundant hydrogen bonds
in DES can simultaneously improve the ionic conductivity (0.12 S/m)
and environmental tolerance of the eutectogel. A reliable strain sensor
based on this eutectogel exhibits high stability over a wide temperature
range (−20∼100 °C) and harsh chemical environments
(acid and base). Furthermore, this recyclable eutectogel can be easily
disintegrated and regelatinized via a simple solvation–evaporation
procedure, while retaining its initial mechanical and sensing performances.
This study creates a candidate for applications in wearable electronic
devices and sheds light on minimizing the environmental impact of
other electronic wastes.
Oral medical wastewater with heavy metal ions (such as plumbum, Pb2+) is regarded as the main pollutant produced in the oral cavity diagnosis, and the treatment process can pose a serious threat to human health. The removal of Pb2+ from oral medical wastewater facing major difficulties and challenges. Therefore, it is of great significance to take effective measures to remove Pb2+ by using effective methods. A new activated three-dimensional framework carbon (3D AFC), regarded as the main material to remove Pb2+ in the oral medical wastewater, has been fabricated successfully. In this experiment, the effects of 3D AFC absorbing Pb2+ under different conditions (including solid-to-liquid ratio, pH, ionic strength, contact time, and initial concentration, etc.) were discussed. And the result revealed that the adsorption kinetics process of Pb2+ on 3D AFC conformed to the pseudo-second-order model and the adsorption isotherm conformed to the Freundlich model. Under the condition that pH = 5.5 and T = 298 k, the calculated maximum adsorption capacity of 3D AFC for Pb2+ was 270.88 mg/g. In practical application, it has strong adsorption ability for Pb2+ in oral medical wastewater. Thus, 3D AFC shows promise for Pb2+ remove and recovery applications because of high adsorption capacity for Pb2+ in oral medical wastewater due to its high specific surface area, outstanding three-dimensional network structure.
Repairs of bone defects caused by osteoporosis have always relied on bone tissue engineering. However, the preparation of composite tissue engineering scaffolds with a three-dimensional (3D) macroporous structure poses huge challenges in achieving osteoconduction and osteoinduction for repairing bone defects caused by osteoporosis. In the current study, a three-dimensional macroporous (150–300 μm) reduced graphene oxide/polypyrrole composite scaffold modified by strontium (Sr) (3D rGO/PPY/Sr) was successfully prepared using the oxygen plasma technology-assisted method, which is simple, safe, and inexpensive. The findings of the MTT assay and AO/EB fluorescence double staining showed that 3D rGO/PPY/Sr has a good biocompatibility and effectively promoted MC3T3-E1 cell proliferation. Furthermore, the ALP assay and alizarin red staining showed that 3D rGO/PPY/Sr increased the expression levels of ALP activity and the formation of calcified nodules. The desirable biocompatibility, osteoconduction, and osteoinduction abilities, assure that the 3D macroporous rGO/PPY/Sr composite scaffold offers promising potential for use in the repair of bone defects caused by osteoporosis in bone tissue engineering.
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