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Pan D.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Ma B.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Dai F.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment
Smart Materials and Structures | Year: 2017

In this work, a bi-stable vibration energy harvester is presented to scavenge energy from ambient vibrations over a wide frequency range. This bi-stable harvester consists of a bi-stable hybrid composite plate as host structure and several pieces of piezoelectric ceramics. Three linear harvesters with the same geometry were employed as the control samples to illustrate the advantages of this bi-stable harvester. The voltage-frequency responses were measured with different g-level excitations, and the output powers across various resistances were measured at different frequencies and accelerations. Unlike the linear harvesters which are effective only near their natural frequencies, the obvious nonlinearities of this bi-stable harvester broaden its working bandwidth. Additionally, the characteristics of this bi-stable host structure contribute to the output power. Under the same condition, when this bi-stable harvester is under cross-well oscillation pattern the maximum output powers are several times higher than those of the linear harvesters. The measured highest output power of this bi-stable harvester is 36.2 mW with 38 Hz frequency and 5g acceleration (g = 9.8 m s-2). © 2017 IOP Publishing Ltd.


Zhang Y.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Zhang Y.,Harbin Institute of Technology | Hu L.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Hu L.,Harbin Institute of Technology | And 5 more authors.
Microporous and Mesoporous Materials | Year: 2010

Hierarchically porous silica ceramics with unidirectionally aligned channel morphology have been synthesized by in situ mineralization of soluble starch monolith. The procedure followed two steps. First, soluble starch monoliths with well-defined uniaxial macroporous structure were prepared by unidirectional solidification process of starch hydrosol or starch hydrogel. Second, such an as-prepared artificial monolith, used as template, was soaked into a surfactant-templated sol-gel solution to mineralize the existing channel structure. It was shown that the macropore size, wall thickness, and macropore morphology in obtained soluble starch materials may be tuned in a certain range, through adjusting the concentration of starch slurry. When initial concentration changed from 10 wt.% to 15 wt.%, the macropore size of soluble starch materials decreased, while the wall thickness increased. Through the second step, porous silica ceramics were obtained after drying and calcining of organic-inorganic hybrid silicate compounds from solution. These resulting products preserved template microstructure in great detail and exhibited narrow macropore size distributions. It was observed that when the soaking time increased from 36 h to 84 h, the average pore size of the silica ceramics was decreased from 4.1 μm to 3.6 μm. In addition, in nanopore regime, all the silica monoliths obtained presented a coexistence of uniform worm-like nanopore and lamellar phase feature, and large BET and microporous surface area. Crown Copyright © 2009.


Han J.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Han J.,Harbin Institute of Technology | Hu L.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Hu L.,Harbin Institute of Technology | And 5 more authors.
Scripta Materialia | Year: 2010

Two hierarchically porous silica ceramics with unidirectionally aligned channel morphology have been in situ synthesized by using soluble starch monoliths with well-defined uniaxial macroporous structure as template. Both these ceramics faithfully inherit the structure of soluble starch templates and show a large BET surface as well as a microstructure of uniform worm-like nanopores and a lamellar phase. These materials may be suitable for use in various separation and reaction processes. Crown Copyright © 2009.


Hu L.,Anhui University of Science and Technology | Wei H.,Anhui University of Science and Technology | Zhang Y.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Zhang S.,Anhui University of Science and Technology | Li B.,Anhui University of Science and Technology
Materials Letters | Year: 2014

TiO2/carbon paper composite materials with a hierarchically porous structure were synthesized by employing a filter paper as the support material and carbon source. The resorcinol-formaldehyde-block copolymer nanocomposite formed by the self-assembly of phenolic resin and F127 under acidic condition was selected as modifier of the microstructure of carbon paper. Results show that the as-adjusted carbon paper preserved the nanostructure of a pure carbonized filter paper. An ordered mesostructure was also formed. This micromorphology resulted in the increased specific surface area, as well as micropore and mesopore volumes, compared with the pure carbonized filter paper. When mesoporous TiO2 was deposited on the carbon paper with ordered mesopore by the evaporation-induced self-assembly route, the TiO 2/carbon paper composite materials displayed excellent adsorption property and enhanced photocatalytic activity of methylene blue. © 2014 Elsevier B.V.


Hu L.,Anhui University of Science and Technology | Zhang Y.,National Key Laboratory of Science and Technology on Advanced Composites in Special Environment | Zhang S.,Anhui University of Science and Technology | Li B.,Anhui University of Science and Technology
RSC Advances | Year: 2016

A transparent TiO2-C@TiO2-graphene free-standing film has been synthesized by electrostatical self-assembling GO nanosheets on a cellulose-TiO2@TiO2 film prepared by a one-step hydrothermal method followed by thermal annealing at 500°C. Scanning and transmission electron microscope observations have shown graphene wrapped flower-like micro/nanostructure TiO2 particles uniformly distribute on TiO2-C fibers that are interconnected with each other to form a 3D reticulate microstructure. X-ray photoelectron spectra have demonstrated that interaction between the TiO2 and graphene facilitates the generation of O-Ti3+ species and Ti-O-C bonds. As a result, the TiO2-C@TiO2-graphene film exhibits a significant enhancement of light absorption within the visible region as compared to the TiO2-C@TiO2 film. Meanwhile, the introduction of a graphene layer slows the recombination of photogenerated electron-hole pairs, increasing the charge transfer rate of electrons. Thus, in the photocatalytic degradation reaction of methylene blue, the photodegradation rate constant for the TiO2-C@TiO2-graphene film is 2.2 times higher than that of the TiO2-C@TiO2 film obtained from thermal treatment of the cellulose-TiO2@TiO2 film. The enhanced photocatalytic property is well consistent with the photoelectrical responses, electrochemical impedance spectroscopy analyses and photoluminescence spectra results. This work may provide a rational and convenient strategy to construct transparent free-standing films with visible light photocatalysis toward environmental purification. © The Royal Society of Chemistry 2016.


PubMed | Anhui University of Science and Technology and National Key Laboratory of Science and Technology on Advanced Composites in Special Environment
Type: | Journal: Journal of colloid and interface science | Year: 2016

A nanofiber-based TiO2(B)/carbon nanofiber membrane has been synthesized by a facile and effective route that incorporates electrospinning approach with hydrothermal method. The prepared membrane shows high flexibility and hydrophilicity. After treatment with a low surface energy fluorosilane, the obtained superhydrophobic surface endows the membrane a high adhesive force due to the hybrid microstructure of TiO2(B) nanotubes and nanoplates on fibers. A water droplet on the surface of the membrane appears spherical in shape, which cannot roll off even when the membrane is bent and turned upside down. When a water droplet dropped from a certain height above the tilt membrane, the rolled water droplet can be stopped after a small displacement. In addition, a 12 l water droplet can be quickly captured from a hydrophobic surface by curvature change of the superhydrophobic TiO2(B)/carbon nanofiber membrane. The membrane with excellent static and dynamic pinning performance to water may be expected to apply to biomedical and microfluidic devices.

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