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Guo Q.,Fujian University of Technology | Guo Q.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application | Dai E.,Washington University in St. Louis | Han X.,Dartmouth College | And 3 more authors.
Journal of the Royal Society Interface | Year: 2015

The capability to sense and respond to external mechanical stimuli at various timescales is essential to many physiological aspects in plants, including self protection, intake of nutrients and reproduction. Remarkably, some plants have evolved the ability to react to mechanical stimuli within a few seconds despite a lack of muscles and nerves. The fast movements of plants in response to mechanical stimuli have long captured the curiosity of scientists and engineers, but the mechanisms behind these rapid thigmonastic movements are still not understood completely. In this article, we provide an overview of such thigmonastic movements in several representative plants, including Dionaea, Utricularia, Aldrovanda, Drosera and Mimosa. In addition, we review a series of studies that present biomimetic structures inspired by fast-moving plants. We hope that this article will shed light on the current status of research on the fast movements of plants and bioinspired structures and also promote interdisciplinary studies on both the fundamental mechanisms of plants' fast movements and biomimetic structures for engineering applications, such as artificial muscles, multi-stable structures and bioinspired robots. © 2015 The Author(s) Published by the Royal Society. All rights reserved. Source


Yang C.,Fujian University of Technology | Yang C.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application | Fang C.,Fujian University of Technology | Fang C.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application
Materials Research | Year: 2015

Scaffolds featuring spatiotemporal control of drug release is highly desirable for bone tissue regeneration. The objective of this study was to construct a scaffold with gradient porosity and drug distribution and evaluate the effect of scaffold structure on drug release kinetics and cell bioactivity. Nano-hydroxyapatite/collagen/phosphatidylserine scaffolds embedded with steroidal saponin loaded collagen microparticles were prepared using a porogen leaching protocol. Morphological characterization showed that the scaffolds consisted of dense layer and loose layer, and pores were interconnective. The microparticles were entrapped at the center of the scaffolds follow a gradient distribution. Release kinetics correlated with the structure. The loose layer showed greater drug release amount as compared to the dense layer. Such differences in release kinetics have distinct effects on cell bioactivity. Cell proliferated much more in loose layer than that in the dense layer. Such spatial and temporal control over drug deposition and delivery within the scaffolds could provide opportunities for tissue regeneration associated with optimum drug doses at wound site, and lessen undesirable drug release and side-effects at uninjured site. © 2015. Source


Hua N.,Fujian University of Technology | Hua N.,Fuzhou University | Hua N.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application | Zheng Z.,Fujian University of Technology | And 15 more authors.
Journal of Non-Crystalline Solids | Year: 2015

Abstract In this study, tribological behavior of a Zr53Al16Co23.25Ag7.75 bulk metallic glass (BMG) in air and phosphate buffer saline (PBS) solution was investigated and compared with biomedical alloy Ti-6Al-4V. It is found that wear resistance of the Zr-Al-Co-Ag BMG sliding in air is superior to that of Ti-6Al-4V alloy. Under dry friction condition, wear deterioration of Zr-based BMG is controlled by oxidation and adhesive wear whereas Ti-6Al-4V alloy is jointly dominated by abrasive and adhesive wear. However, Zr-based BMG presents decreased wear resistance under lubricated friction condition in comparison with dry friction condition. In contrast, Ti-6Al-4V alloy shows improved wear resistance sliding in PBS. This is probably associated with the inferior pitting corrosion resistance of Zr-Al-Co-Ag BMG in the medium containing chloride ions, which may cause tribocorrosion controlled by synergistic effects of abrasive and corrosive wear. The possible mechanism for corrosion accelerating wear is discussed based on the tribological behavior of this Zr-based BMG. © 2015 Elsevier B.V. Source


Zheng C.,Fujian University of Technology | Zheng C.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application | Li Y.,Fujian University of Technology | Huang L.,Fujian University of Technology | And 4 more authors.
Optical Materials | Year: 2015

A facile method to assemble tetragonal Pt clusters on the surface of graphene oxide (Pt-cluster/GO) using anatase TiO2 as a template is proposed. The morphology and structure of Pt-cluster/GO were investigated, revealing that tetragonal Pt clusters with a diameter of 20-50 nm composed of 2-3 nm Pt nanoparticles (NPs) were homogenously decorated on the surface of GO. The nonlinear optical properties were characterized by the open-aperture Z-scan technique in the nanosecond regime using a laser with wavelength of 532 nm. The as-prepared Pt-cluster/GO hybrid was found to show strong optical limiting (OL) effects for nanosecond laser pulses at 532 nm, and the OL performance is superior to that of carbon nanotubes, a benchmark optical limiter. Furthermore, the Z-scan results showed that the OL performance of the Pt-cluster/GO hybrid is superior to that of GO and the Pt-NP/GO hybrid. The OL behavior of the metal/GO composite nanostructure can be effectively tailored by altering the aggregation means of metal NPs. Scattering measurements suggested that nonlinear scattering (NLS) played an important role in the observed OL behavior in the Pt-cluster/GO hybrid. The OL properties of the Pt-cluster/GO hybrid are attributed to the reverse saturable absorption in the GO sheet and NLS in the metal NPs. © 2015 Elsevier B.V. All rights reserved. Source


Zheng C.,Fujian University of Technology | Zheng C.,Fujian Provincial Key Laboratory of Advanced Materials Processing and Application | Dai C.,Fujian University of Technology | Huang L.,Fujian University of Technology | And 4 more authors.
Optical Materials | Year: 2016

Cadmium metasilicate nanowires (CdSiO3 NWs) have been synthesized through a facile, eco-friendly, low-cost water-ethanol mixed-solution hydrothermal route. The transmission electron microscopy measurements of as-prepared samples indicate that the CdSiO3 NWs with diameters in the range of 10-60 nm and lengths of more than 1 μm were constructed by self-assembly of 5-10-nm CdSiO3 nanoparticles with good crystallinity. The monoclinic phase formation of the sample is studied in detail by X-ray diffraction, Fourier-transform infrared spectroscopy, and thermo gravimetric analysis. The results indicate that a pure monoclinic phase of CdSiO3 can be obtained by a hydrothermal route without further calcinations and SiO4 tetrahedra were the main constituents of the CdSiO3 NWs. The nanosecond optical limiting (OL) effects were characterized by using an open-aperture (OA) Z-scan technique with 4-ns laser pulses at both 532 and 1064 nm. Theses CdSiO3 NWs displayed an excellent OL performance at 532 and 1064 nm, which was better than carbon nanotubes, a benchmark optical limiter. Input-fluence dependent scattering measurements suggested than nonlinear scattering played an important role in the observed optical limiting behavior in CdSiO3 NWs at 532 and 1064 nm. More significantly, the NLO performance in CdSiO3 NWs incorporated solid silica gel glass has been improved in comparison to those dispersed in water. The unique structure and excellent OL property render these CdSiO3 NWs competitors in the realms of optical limiting applications. © 2016 Elsevier B.V. All rights reserved. Source

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