2 research outputs found

    Superelastic Graphene Aerogels Constructed by Structural Modulation for Piezoresistive Sensing

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    The microstructure is a critical factor in determining the macroscopic properties of aerogel materials and has a significant impact on their performance in various application scenarios. Here, drawing inspiration from the microstructure regulation of the bubble template, polyvinylpyrrolidone (PVP) was used to microscopically regulate graphene oxide nanosheets in the fabrication of the graphene aerogel (GA). Simultaneously, sodium dodecyl sulfate (SDS) foaming was employed as the bubble template to aid in the construction of PVP/SDS-GA (PSGA) with a hierarchical porous structure. Such an innovative structural blueprint inherently promotes a more even distribution of stress, thereby enhancing the compressive strength of the aerogel. The advanced architecture of PSGA enables rapid desiccation by using ambient pressure and elevated thermal methods, simplifying the fabrication process. PSGA possesses several remarkable characteristics: an ultralow density of 2.84 mg/cm3, a high electrical conductivity of 10 S/m, a superelasticity with an extreme strain of 99%, an outstanding fatigue resistance with the ability to withstand 10,000 cycles at 70% strain, and a high compressive strength of 0.66 MPa. In light of these characteristics, the piezoresistive sensor conceptualized using PSGA as a foundational substrate exhibited superior signal discernment capabilities

    Biodegradable and biocompatible alginate/gelatin/MXene composite membrane with efficient osteogenic activity and its application in guided bone regeneration

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    Guided bone regeneration (GBR) utilizes a barrier membrane to maintain the osteogenic space and promote osseointegration of the implants. Developing a novel biomaterial to meet the mechanical and biological performance requirements of GBR membrane (GBRM) remains a huge challenge. Here, the sodium alginate (SA, S)/gelatin (G)/MXene (M) composite membrane (SGM) was prepared by combining sol-gel and freeze-drying processes. The incorporation of MXene improved the mechanical properties and hydrophilicity of the SA/G (SG) membrane, and also enhanced its cell proliferation and osteogenic differentiation. More importantly, when the concentration of MXene is 0.25%W/V, the SGM composite membrane exhibited the best tensile strength (40 MPa), high swelling rate (1012%), and appropriate degradation rate (40%). Meanwhile, the biological improvements were more significant. Therefore, the appropriate amount addition of MXene has a positive and obvious effect on the improvements of the mechanical properties, biocompatibility, and osteogenic induction of the SG composite membranes. This work provides a more extendable development idea for the application of SGM composite membrane as GBRM.</p
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