Aerogels
have attracted great interest for their unique properties,
but their mechanical brittleness and poor functionality highly limit
their practical applications. Herein, we report unprecedented superelastic
multifunctional aminosilane-crosslinked reduced graphene oxide (AC–rGO) aerogels that are prepared via a facile and scalable
strategy involving simultaneous crosslinking and reducing of graphene
oxide nanosheets with different kinds of aminosilanes via C–N
coupling and hydrolytic polycondensation reactions. It is found that
3-aminopropyl(diethoxy)methylsilane (APDEMS) is the better choice
to enhance hydrophobicity, elasticity, and other properties of the
resulting aerogels compared with (3-aminopropyl)triethoxysilane. One
APDEMS molecule plays three roles as a crosslinker, a reductant, and
a hydrophobizing agent. An outstanding combination of high surface
area, ultralow density, superhydrophobicity, supercompressibility,
superelasticity, low thermal conductivity, ultrahigh absorption capacity
for organic liquids, efficient three-component separation, and strain/pressure
sensing has been achieved in a single APDEMS-crosslinked rGO aerogel
for the first time. In addition, a flexible, highly sensitive, and
moisture-resistant AC–rGO aerogel-based strain/pressure-sensing
array for the effective detection of strain (0–80%)/pressure
(10 Pa to 10 kPa) distributions and object shapes has been demonstrated.
Under the background of macro environment, on the basis of PEST analysis framework, the paper summaries 11 factors which influence the application of users of Chinese online education platform. Through DEMATEL-ISM methods, this study combs the logical relationship between factors, draws the causal relationship diagram, and sorts the influencing factors into structural levels. The result indicates that the influencing factors of Chinese online education platform can form a multi-level hierarchical structure model of three-level and sixlayer, in which users' needs and values are the direct influencing factors, and legal supervision and change of policy are the fundamental factors. The two methods have a high degree of consistency in the centrality of conclusion, reason analysis and level division which proves the scientificity and rationalization of the construction of DEMATEL-ISM model. The paper then proposes countermeasures and suggestions to promote the sustainable and healthy development of online education platforms from the perspective of the government and platforms.
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