Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption...Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption of water and methanol by means of low energy electron diffraction, thermal desorption spectra and X-ray photoelectron spectroscopy. The relative adsorption strengths of chemisorbed methanol and water vary with the TiO2 surface structures and the ad- sorption sites. This leads to TiO2 surface structure-dependent competitive adsorption of water and methanol. The chemisorption of CH3OH on TiO2 anatase （001）-（1 × 4） surface is seldom affected by pre-covered water at low cov- erages but is affected by pre-covered water at high coverages; the chemisorption of CH3OH on TiO2 rutile （110） surface is seldom affected by pre-covered water; and the chemisorption of CH3OH on TiO2 rutile （011）-（2 × 1） sur- face is affected by pre-covered water even at low coverages. These results deepen the fundamental understandings of surface chemistry on TiO2 surfaces.展开更多
A transmission electron microscopy （TEM） investigation has been performed on the dislocation pinning in Lie-ordered Ni3（Al, Ti） containing disordered γ precipitates.The morphology of deformation induced dislocati...A transmission electron microscopy （TEM） investigation has been performed on the dislocation pinning in Lie-ordered Ni3（Al, Ti） containing disordered γ precipitates.The morphology of deformation induced dislocations in the γ base alloys containing fine dispersion of disordered γ was investigated by means of weak-beam electron microscopy. The superdislocations are strongly attracted to the disordered particles and dissociate on the （111） plane in the γ particles, while they dissociate on the （010） plane in the γ＇ matrix. The disordered γ precipitates play an important role as a pinning point during the cross-slip of superdislocations from （111） to （010） planes in the γ matrix and restrain the cross-slip of superdislocations. The interaction of superdislocations with disordered particles causes the formation of superkinks, jogs and closed loops.展开更多
Recent numerical simulations have indicated that integrin clustering during cell- substrate adhesion can be driven by the presence of a repulsive layer between the cell membrane and the substrate （Paszek et al., PLoS...Recent numerical simulations have indicated that integrin clustering during cell- substrate adhesion can be driven by the presence of a repulsive layer between the cell membrane and the substrate （Paszek et al., PLoS Comput Biol 5：12, 2009）. Here we present a simple me- chanics model of this phenomenon in which the attraction between integrins is mediated by the long-range elastic deformation of the membrane and the repulsive layer. We obtain analytical solutions to the problem by employing the small deformation theory of an infinitely extended plate resting on an elastic foundation.展开更多
AΛ^(*) resonance model for the η-Λ interaction near threshold is proposed.By assuming the Λ^(*)(1670)excitation dominates in the K^(-)p→ηΛ reaction near threshold,the corresponding η production cross section a...AΛ^(*) resonance model for the η-Λ interaction near threshold is proposed.By assuming the Λ^(*)(1670)excitation dominates in the K^(-)p→ηΛ reaction near threshold,the corresponding η production cross section and the s-wave η-Λ scattering length are calculated.The obtained production cross section is consistent with the available experimental data,which indicates that the Λ^(*)(1670)excitation is dominant in the production reaction near threshold.The η-Λ interaction is found to be attractive.展开更多
Lipid rafts are a dynamic microdomain structure found in recent years, enriched in sphin- golipids, cholesterol and particular proteins. The change of structure and function of lipid rafts could result in many disease...Lipid rafts are a dynamic microdomain structure found in recent years, enriched in sphin- golipids, cholesterol and particular proteins. The change of structure and function of lipid rafts could result in many diseases. In this work, the monolayer miscibility behavior of mixed systems of Egg-Sphingomyelin （ESM） with 1, 2-dioleoyl-sn-glycero-3-phosphocholine was in- vestigated in terms of mean surface area per molecule and excess molecular area AAex at certain surface pressure, surface pressure and excess surface pressure Arcex at certain mean molecular area. The stability and compressibility of the mixed monolayers was assessed by the parameters of surface excess Gibbs free energy AGex, excess Helmholtz energy AHex and elasticity. Thermodynamic analysis indicates AAex and ATrex in the binary systems with positive deviations from the ideal behavior, suggesting repulsive interaction. The max- imum of AGex and AHex was at the molar fraction of ESM of 0.6, demonstrating the mixed monolayer was more unstable. The repulsive interaction induced phase separation in the monolayer.展开更多
基金This work was financially supported by National Basic Research Program of China （2013CB933104）, National Natural Science Foundation of China （21525313, U 1332113）, Chinese Academy of Sciences （KJZD-EW-M03）, MOE Fundamental Research Funds for the Central Universities （WK2060030017） and Collaborative Innovation Center of Suzhou Nano Science and Technology.
文摘Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption of water and methanol by means of low energy electron diffraction, thermal desorption spectra and X-ray photoelectron spectroscopy. The relative adsorption strengths of chemisorbed methanol and water vary with the TiO2 surface structures and the ad- sorption sites. This leads to TiO2 surface structure-dependent competitive adsorption of water and methanol. The chemisorption of CH3OH on TiO2 anatase （001）-（1 × 4） surface is seldom affected by pre-covered water at low cov- erages but is affected by pre-covered water at high coverages; the chemisorption of CH3OH on TiO2 rutile （110） surface is seldom affected by pre-covered water; and the chemisorption of CH3OH on TiO2 rutile （011）-（2 × 1） sur- face is affected by pre-covered water even at low coverages. These results deepen the fundamental understandings of surface chemistry on TiO2 surfaces.
基金the Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan the National Natural Science Foundation of China （No. 59971008）.
文摘A transmission electron microscopy （TEM） investigation has been performed on the dislocation pinning in Lie-ordered Ni3（Al, Ti） containing disordered γ precipitates.The morphology of deformation induced dislocations in the γ base alloys containing fine dispersion of disordered γ was investigated by means of weak-beam electron microscopy. The superdislocations are strongly attracted to the disordered particles and dissociate on the （111） plane in the γ particles, while they dissociate on the （010） plane in the γ＇ matrix. The disordered γ precipitates play an important role as a pinning point during the cross-slip of superdislocations from （111） to （010） planes in the γ matrix and restrain the cross-slip of superdislocations. The interaction of superdislocations with disordered particles causes the formation of superkinks, jogs and closed loops.
基金supported by the Rhode Island Consortium for Nanoscience and Nanotechnologyby the National Science Foundation (Grant No. CMMI-1028530)
文摘Recent numerical simulations have indicated that integrin clustering during cell- substrate adhesion can be driven by the presence of a repulsive layer between the cell membrane and the substrate （Paszek et al., PLoS Comput Biol 5：12, 2009）. Here we present a simple me- chanics model of this phenomenon in which the attraction between integrins is mediated by the long-range elastic deformation of the membrane and the repulsive layer. We obtain analytical solutions to the problem by employing the small deformation theory of an infinitely extended plate resting on an elastic foundation.
基金Supported by the National Natural Science Foundation of China under Grant No.19675044.
文摘AΛ^(*) resonance model for the η-Λ interaction near threshold is proposed.By assuming the Λ^(*)(1670)excitation dominates in the K^(-)p→ηΛ reaction near threshold,the corresponding η production cross section and the s-wave η-Λ scattering length are calculated.The obtained production cross section is consistent with the available experimental data,which indicates that the Λ^(*)(1670)excitation is dominant in the production reaction near threshold.The η-Λ interaction is found to be attractive.
文摘Lipid rafts are a dynamic microdomain structure found in recent years, enriched in sphin- golipids, cholesterol and particular proteins. The change of structure and function of lipid rafts could result in many diseases. In this work, the monolayer miscibility behavior of mixed systems of Egg-Sphingomyelin （ESM） with 1, 2-dioleoyl-sn-glycero-3-phosphocholine was in- vestigated in terms of mean surface area per molecule and excess molecular area AAex at certain surface pressure, surface pressure and excess surface pressure Arcex at certain mean molecular area. The stability and compressibility of the mixed monolayers was assessed by the parameters of surface excess Gibbs free energy AGex, excess Helmholtz energy AHex and elasticity. Thermodynamic analysis indicates AAex and ATrex in the binary systems with positive deviations from the ideal behavior, suggesting repulsive interaction. The max- imum of AGex and AHex was at the molar fraction of ESM of 0.6, demonstrating the mixed monolayer was more unstable. The repulsive interaction induced phase separation in the monolayer.
