We report the synthesis of carbon nanotubes (CNTs)/mesostructured silica core-shell nanowires via an interfacial surfactant templating approach. The nanowires possess perpendicularly aligned and uniform accessible mesopores, high surface area and large pore volume. When dimethyl sulfoxide reductase (DMSOR) enzyme is immobilized on the core-shell nanowires, the complex can enhance the electrical communication between the active sites of the enzyme and the electrode surface in the presence of a mediator. The unique properties of the CNTs and the uniform accessible mesopores of the nanowires have made this material promising in the applications as carbon nanotubes field-effect transistors, electrochemical detection, and biosensors.
In order to study the humidity sensing property and sensing mechanism of Al-doped mesoporous silica SBA-15 (Al-SBA-15), Al-SBA-15 was prepared by a simple grind method following a heat-treatment process. Its structure and morphology was characterized by X-ray diffraction (XRD), Infrared (IR), scanning electron microscope (SEM). Humidity sensing response was studied and the results indicated that Al-SBA-15 displayed better sensing property when the frequency was 100 Hz. The impedance of Al-SBA-15 changes three orders of magnitude when relative humidity changes from 11% to 95%. Complex impedance spectra, the corresponding equivalent circuit under different relative humidity are carefully analyzed to explore the humidity sensing mechanism of this material. This material can be used as a promising humidity sensing material.
Internationalization of higher education has become an irreversible trend of modern world, where international course is the key link. For Chinese universities, during the transition from traditional ‘Foreign students class’ (for foreign students only) to ‘International class’, in which Chinese students and foreign students will be trained under one roof, they have to face great challenges of teaching transition, including teaching contents, methods, examinations transformations. In this paper, taking materials physics courses for example, we put forward some suggestions on teaching transformation of international education from ‘Foreign students class’ to ‘International class’, basing on the experience of one-year visiting in University of Victoria (UVic), Canada and the differences of teaching between our Northwestern Polytechnical University (NPU) and UVic.
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