2 research outputs found
Superelastic Graphene Aerogels Constructed by Structural Modulation for Piezoresistive Sensing
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
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