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Phase field modeling of ferroelastic variant switching in yttria-stabilized t'zirconia with strain gradient elasticity and interface tension

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Science China(Technological Sciences) 2024年第5期67卷 1443-1457页

作者： ZHOU QianQian WEI YueGuang ZHOU YiChun YANG Li College of Engineering BIC-ESATPeking UniversityBeijing100871China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an710126China

The 6–8 wt%yttria-stabilized zirconia with a tetragonal structure(t’-YSZ)is extensively employed in thermal barrier *** exceptional fracture toughness of t’-YSZ can be attributed to its distinctive ferroelastic toughening *** and interface tension play a critical role in ferroelastic variant switching at the micro-and *** paper presents an original thermodynamically consistent phase field(PF)theory for analyzing ferroelastic variant switching at the micro-and nano-scale of t’-*** theory incorporates strain gradient elasticity using higher-order elastic energy and interface tension tensor via geometric nonlinearity to represent biaxial tension resulting from interface ***,a mixed-type formulation is employed to implement the higher-order theory through the finite element *** an interface in equilibrium,the effects of strain gradient elasticity result in a more uniform distribution of stresses,whereas the presence of interface tension tensor significantly amplifies the stress magnitude at the *** introduction of an interface tension tensor increases the maximum value of stress at the interface by a factor of 4 to *** nucleation and evolution of variants at a pre-existing crack tip in a mono-phase t’-YSZ have also been *** strain gradient elasticity is capable of capturing the size effect of ferroelastic variant switching associated with microstructures in ***,when the grain size approaches that of the specimen,the critical load required for variant switching at the crack tip increases,resulting in greater dissipation of elastic energy during ferroelastic variant ***,the interface tension accelerates the evolution of *** presented framework exhibits significant potential in modeling ferroelastic variant switching at the micro-and nano-scale.

关键词： thermodynamics strain gradient elasticity interface tension phase field method ferroelastic variant switching

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In vitro Blood Compatibility of Polyethylene Terephthalate with Covalently Bounded Hirudin on Surface

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 950-954页

作者：李方 School of Petroleum Engineering Southwest Petroleum University Lab of Surface Modification of Artificial Organs of Sichuan Key Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong University

Polyethylene terephthalate （PET,Dacron） was modified by surface immobilization of hirudin with glutaraldehyde（GA） as coupling reagent to improve the blood ***-immobilized PETs were characterized by X-ray photoelectron spectroscopy （XPS） and contact angle *** blood compatibility of the PETs was evaluated by platelet adhesion evaluation and fibrinogen conformational change measurements in *** results showed the decrease of platelet adhesion and activation on hirudin-immobilized PET with increasing of glutaraldehyde *** experiment showed that fibrinogen adherence and conformational changes of PET-HRD were less than those of untreated PET,which made the materials difficult to form *** proper reason of blood compatibility improvement was low interface tension between hirudin-immobilized PETs and blood,as well as blood proteins,and low ratio of dispersive/polar component of the surface energy（γsd/γsp） and high hydrophilicity.

关键词： hirudin blood compatibility poly(ethylene terephthalate) (PET) interface tension surface energy

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Synthesis and Physic-chemical Properties of an Zwitterionic Gemini Surfactant

Synthesis and Physic-chemical Properties of an Zwitterionic ...

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中国化学会第九届全国无机化学学术会议

作者： Zhe Liu Fei Yang Ruiqiong Wang Siwen Li Ronglan Zhang Jianshe Zhao Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education Shaanxi Key Laboratory of Physico-Inorganic Chemistry College of Chemistry & Material Science Northwest University

Zwitterionic gemini surfactant with different hydrophobic tails(C-8, C-12 and CA-12) were synthesized by using ethylene glycol, phosohorus trichloride, oxygen, et al. as reactants. They were structurally characterized by IR,EA, 1H NMR, and 31 P NMR. Surface tension and oil/water interface tension were fully studied. The cmc of the synthesized surfactants evaluated by surface tension measurements ranges from 2.17×10-4 mol L-1 to 5.36×10-4 mol L-1 and the cmc surface tension values(γcmc) ranges from 26.49 m N m-1 to 29.06 m N m-1, which show excellent efficiency at reducing the water surface tension among the comparison surfactants. And on the other hand, all the surfactants can efficiently reduce the oil/water interface tension.

关键词： gemini surfactant zwitterionic surfactant synthesis interface tension

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