RESUMO
High-gauge-factor stretchable strain sensors are developed by utilizing a new strategy of thickness-gradient films with high durability, and high uniaxial/isotropic stretchability based on the self-pinning effect of SWCNTs. The monitoring of detailed damping vibration modes driven by weak sound based on such sensors is demonstrated, making a solid step toward real applications.
Assuntos
Elasticidade , Equipamentos e Provisões Elétricas , Simulação por Computador , Dimetilpolisiloxanos , Impedância Elétrica , Desenho de Equipamento , Análise de Elementos Finitos , Ouro , Resistência à TraçãoRESUMO
Porous microspheres of regenerated cellulose with size in range of 1-2 µm and composite microspheres of chitosan coated cellulose with size of 1-3 µm were obtained through a two-step spray-assisted approach. The spray coagulating process must combine with a spray drying step to guarantee the formation of stable microspheres of cellulose. This approach exhibits the following two main virtues. First, the preparation was performed using aqueous solution of cellulose as precursor in the absence of organic solvent and surfactant; Second, neither crosslinking agent nor separated crosslinking process was required for formation of stable microspheres. Moreover, the spray drying step also provided us with the chance to encapsulate guests into the resultant cellulose microspheres. The potential application of the cellulose microspheres acting as drug delivery vector has been studied in two PBS (phosphate-buffered saline) solution with pH values at 4.0 and 7.4 to mimic the environments of stomach and intestine, respectively.