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Chen L.,Sun Yat Sen University | Zuo W.,Sun Yat Sen University | Li L.,Sun Yat Sen University | Yang Y.,Sun Yat Sen University | And 4 more authors.
Journal of Physical Chemistry C | Year: 2014

We discuss theoretically the effect of complex surface tension on the dispersion relation of a capillary wave, and we deduce an analytical expression for the attenuation of a capillary wave due to the imaginary part of the complex surface tension. We make use of our recently developed apparent energy dissipation spectroscopy to measure the attenuation of a propagating capillary wave at an air-water interface via a microrheometer based on an atomic force microscope. We show that the revised theoretical expression for the attenuation of a capillary wave can satisfactorily explain the abnormal attenuation of such a wave, which stems from both the apparent energy dissipation spectrum and optical scattering, and we obtain the same value for the imaginary part of the surface tension of water. (Figure Presented). © 2014 American Chemical Society. Source


Xiang H.-T.,Sun Yat Sen University | Liang S.-D.,Sun Yat Sen University | Liang S.-D.,State Key Laboratory of Optoelectronic Materials and Technologies | Liang S.-D.,Provincial Key Laboratory of display Materials and Technologies
Wuli Xuebao/Acta Physica Sinica | Year: 2015

The dynamic complex network is an important model of social structure and stability. Based on the single dynamic complex network, we propose a growing double-network evolutionary gambling model. When the two networks are separated, we find that the average of cooperation strategy has a jump as the payoff increases, which can be regarded as a phase transition. This result is a generalized result of static gambling network. When the two networks are connected, their averages of cooperation strategy are synchronized. When the intra-linkages are increased, the natural selection does not favor cooperation, while the fair selection does. When the inter-linkages are increased, the average of cooperation strategy decreases for both networks. As the ratio of inter- and intra- linkage is constant, the more the average degree, the less the cooperation. We find the existence of defection leader, and uncover its influence on the average of cooperation strategy and how it interacts with cooperation leader. These results provide some hints to understand the social structure, stability and evolution. © 2015 Chinese Physical Society. Source


Xiong X.-M.,Sun Yat Sen University | Xiong X.-M.,State Key Laboratory of Optoelectronic Materials and Technologies | Xiong X.-M.,Guangdong Provincial Key Laboratory of Photovoltaics Technologies | Chen L.,Sun Yat Sen University | And 5 more authors.
Chinese Physics Letters | Year: 2014

We report a direct measurement of the imaginary part of the surface tension of water through a dynamic scheme using a thin vertical glass fiber of diameter of 3 μm with one end glued onto a cantilever beam and the other end touching a water-air interface. The frequency dependence of the dissipation factor experienced by the glass fiber is exactly calculated through measuring the phase delay with various frequencies when the glass fiber is forced to oscillate vertically. We find the same intercept at the dissipation factor axis for different frequency dependences of the dissipation factor for different depths by which the glass fiber is dipped into water. This nonzero dissipation factor at zero frequency presents direct evidence of the existence of the imaginary part of surface tension of water and yields a complex surface tension of water σ* = 0.073 + i(0.017 ± 0.002) N/m at room temperature. © 2014 Chinese Physical Society and IOP Publishing Ltd. Source


Ke X.,State Key Laboratory of Optoelectronic Materials and Technologies | Deng L.-L.,State Key Laboratory of Optoelectronic Materials and Technologies | Shen P.-K.,State Key Laboratory of Optoelectronic Materials and Technologies | Cui G.-F.,Sun Yat Sen University
Chemical Research in Chinese Universities | Year: 2010

Pd was electrochemically deposited on gold-coated quartz crystals at nanogram-level. The coulombic efficiency and initial nucleation and growth mechanism of potentiostatic Pd deposition were investigated via in situ electrochemical quartz crystal microbalance(EQCM). The coulombic efficiencies are 84%, 93% and 95% for Pd deposition at 0.3, 0.2 and 0.1 V(vs. SCE), respectively. The results of chronoamperometric measurements show that the Pd deposition proceeded by an instantaneous nucleation(at 0.3 V) or progressive nucleation(at 0.2 and 0.1 V) in a three-dimensional(3D) growth mode. The catalytic activity of Pd-based electrocatalyst for ethanol oxidation was characterized in an alkaline solution. It was found that the highest mass activity for ethanol oxidation on Pd-based electrocatalyst is 1.8×10 4 A/(g Pd) deposited at 0.3 V for 5 s. Source


He C.,State Key Laboratory of Optoelectronic Materials and Technologies | He C.,Sun Yat Sen University | Shen P.K.,State Key Laboratory of Optoelectronic Materials and Technologies | Shen P.K.,Sun Yat Sen University
Nano Energy | Year: 2014

We report a microwave-assisted method to synthesize truncated hexagonal pyramid (THP) tungsten carbide with 5nm in size on graphene sheets (WCTHP/G) for the first time. The high-resolution transmission electron microscope (HRTEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) analysis confirm that the WCTHP nanoparticles are dominated by (011-0), (101-0) and (11-00) facets with a preferred orientation of [0001]. The Pt loaded WCTHP/G materials show high activity and extremely high stability in electrocatalysis. This method can be developed as a general strategy for synthesizing high surface area, nanostructured transition metal carbides (TMCs) and utilizing them as active and low-cost catalysts or catalyst supports in a broad range of sustainable energy technologies. © 2014 Elsevier Ltd. Source

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