RESUMO
The interfacial adhesion behaviour of a ZnO nanowire-Si substrate system is investigated using an in situ scanning electron microscope (SEM) mechanical peeling technique. The peel front of a nanowire advances via stick-slip events, and an equilibrium between the driving and resistant force to separation occurs immediately prior to a slip event. The interfacial adhesion energy is one order higher than that predicted theoretically by van der Waals interactions. The enhanced adhesion is primarily attributed to chemical and electrostatic interfacial interactions induced by electron irradiation. This work demonstrates that the operating environment of a nanoscale system could dramatically influence its adhesion behaviour. These findings are expected to have significant implications for interpreting the adhesion behaviour exhibited by a 1D nanostructure-substrate system when applying different testing methodologies, and for the fabrication of future NEMS devices.
Assuntos
Reembolso de Seguro de Saúde , Admissão do Paciente/economia , Instituições de Cuidados Especializados de Enfermagem/legislação & jurisprudência , Financiamento Pessoal , Humanos , Renda , Seguro , Medicaid , Medicare , Instituições de Cuidados Especializados de Enfermagem/normas , Estados UnidosRESUMO
The effect of finger tremor of the administration of 150 mg of caffeine three times daily for two days was measured using an accelerometer in 7 healthy subjects taking their normal diet (excluding caffeine-containing beverages). The effect on finger tremor of a short period of fasting with and without the 450 mg daily dose of caffeine was also studied in the same 7 subjects. Fasting increased finger tremor significantly when caffeine was administered. In doses comparable to the likely adult daily intake in this country, caffeine did not increase finger tremor whilst subjects were taking their normal diet.
