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Multi-stimuli-triggered and self-repairable fluorocarbon organic coatings with urea-formaldehyde microcapsules filled with fluorosilane

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Journal of Materials Science & Technology 2020年第10期42卷 70-83页

作者： Paul CUzoma Fuchun Liu en-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and engineering University of Science and Technology of ChinaHefei230026China Shenyang Zhongke engineering Technology Center for Corrosion Control Shenyang110016China Department of Polymer and Textile engineering Federal University of TechnologyP.M.B.1526OwerriNigeria

For the purpose of overcoming the lack of durability problems associated with superhydrophobic surfaces which hitherto has limited their use;we prepared multi-stimuli wettability response coatings using a mixture of fluorocarbon resin and urea-formaldehyde microcapsules filled with fluorosilane via interfacial polymerization *** microcapsules are of good thermal stability and can be triggered to release their core content on exposure to atmospheric conditions resulting in the increase in the water contact angle from 97°to 151°.The prepared coatings gave good adhesion strength,and also showed an increase in the hydrophobic property after undergoing scratch,solvent and UV accelerated aging *** addition,they offered good self-healing of the hydrophobic property after an initial loss due to alkaline immersion and oxygen plasma *** electrochemical measurements revealed a remarkable impedance recovery and suppression of corrosion activities,suggesting them to be a potential candidate material for corrosion protection.

关键词： Multi-stimuli Microcapsules Superhydrophobic Self-healing Coatings Anti-corrosion

Modeling and identification of magnetostrictive hysteresis with a modified rate-independent Prandtl-Ishlinskii model

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Chinese Physics B 2018年第9期27卷 626-634页

作者： Wei Wang Jun-en Yao School of Instrumentation Science and Opto-electronics engineering Beihang UniversityBeijing 100083China School of Physics and Nuclear energy engineering Beihang UniversityBeijing 100083China Laboratory of Micro-nano Measurement Manipulation and PhysicsBeihang UniversityBeijing 100083China

This paper presents a modified rate-independent Prandtl-Ishlinskii （MRIPI） model based on the Fermi-Dirac distri- bution for the asymmetric hysteresis description of magnetostrictive actuators. Generally, the classical Prandtl-Ishlinskii （CPI） model can hardly describe the asymmetric hysteresis. To overcome this limitation, various complex operators have been developed to replace the classical operator. In this study, the proposed MRIPI model maintains the classical operator while a modified input function based on the Fermi-Dirac distribution is presented to replace the classical input function. With this method, the MRIPI model can describe the asymmetric hysteresis of magnetostrictive actuators in a relatively simple mathematic format and has fewer parameters to be identified. A velocity-based sine cosine algorithm （VSCA） is also proposed for the parameter identification of the MRIPI model. To verify the validity of the MRIPI model, experiments are performed and the results are compared with those of the existing modeling methods.

关键词： Prandtl-Ishlinskii model velocity-based sine cosine algorithm asymmetric hysteresis nonlinear-ity magnetostrictive actuator

Acoustoelastic effects on mode waves in a fluid-filled pressurized borehole in triaxially stressed formations

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Acta Mechanica Sinica 2006年第6期22卷 569-580页

作者： Ping'en Li Youquan Yin Xianyue Su LTCS Department of Mechanics and Aerospace Engineering College of Engineering Peking University Beijing 100871 China

Based on the nonlinear theory of acoustoelasticity, considering the triaxial terrestrial stress, the fluid static pressure in the borehole and the fluid nonlinear effect jointly, the dispersion curves of the monopole Stoneley wave and dipole flexural wave prop- agating along the borehole axis in a homogeneous isotropic formation are investigated by using the perturbation method. The relation of the sensitivity coefficient and the velocity-stress coefficient to frequency are also analyzed. The results show that variations of the phase velocity dispersion curve are mainly affected by three sensitivity coefficients related to third-order elastic constant. The borehole stress concentration causes a split of the flexural waves and an intersection of the dispersion curves of the flexural waves polarized in directions parallel and normal to the uniaxial horizontal stress direction. The stress-induced formation anisotropy is only dependent on the horizontal deviatoric terrestrial stress and independent of the horizontal mean terrestrial stress, the superimposed stress and the fluid static pressure. The horizontal terrestrial stress ratio ranging from 0 to 1 reduces the stress-induced formation anisotropy. This makes the intersection of flexural wave dispersion curves not distinguishable. The effect of the fluid nonlinearity on the dispersion curve of the mode wave is small and can be ignored.

关键词： Triaxial terrestrial stress Borehole fluid pressure Fluid nonlinear effect Acoustoelasticity Dispersion curve crossover

Characteristics of Oxidation and Oxygen Penetration of Alloy 690 in 600°C Aerated Supercritical Water

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Journal of Materials Science & Technology 2018年第3期34卷 561-569页

作者： Xiangyu Zhong Xinqiang Wu en-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The oxide films formed on Alloy 690 exposed to 600 ℃ supercritical water were characterized using mass measurement, X-ray diffraction. Raman spectroscopy, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. It was found that the mass gain of the alloy in supercritical water decreased with increasing exposure time. The oxide films have a double-layer structure, with an inner layer rich in Cr and outer layer rich in Ni and Fe after short time and long time exposure. The penetration of the oxide along the grain boundaries was observed, and the penetration depth increased with increasing exposure time. The grain boundaries and voids are the short-path of oxygen diffusion into the metal.

关键词： Ni-based alloy XPS Supercritical water High temperature corrosion High temperature oxidation Oxide film

Influence of Conductivity on Corrosion Behavior of 304 Stainless Steel in High Temperature Aqueous environment

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Journal of Materials Science & Technology 2016年第4期32卷 333-340页

作者： Jiazhen Wang Jianqiu Wang en-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences

The influence of conductivity on corrosion behavior of 304 stainless steel （SS） in high temperature water was investigated by using in-situ potentiodynamic polarization curves, electrochemical impedance spectra （EIS） at 300 ℃, and ex-situ scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and X-ray pho- toelectron spectroscopy （XPS）. The structures of oxide films formed on 304 SS change with different conductivities at 300 ℃. With the increase in conductivity, the passive current density increases while the resistances of oxide films decrease. But the resistances do not decrease lineally with the increase in conductivity. A modified double-layer model for oxide structure was proposed to explain the influence mechanism of conductivity on the oxide films on 304 SS in high temperature water. Improving the 10B enrichment level can reduce the conductivity of primary water and increase the corrosion resistance of 304 SS.

关键词： Stainless steelPolarizationElectrochemical impedance spectraHigh temperature corrosion

Mechanical and Barrier Properties of Epoxy/ultra-short Glass Fibers Composite Coatings

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Journal of Materials Science & Technology 2012年第12期28卷 1077-1084页

作者： Yongsheng Hao Fuchun Liu en-Hou Han State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China

Epoxy coatings containing different volume fractions of ultra-short glass fibers were prepared successfully. Ultra-short glass fiber not only can improve the hardness, adhesion of the coating, and glass transition tem-perature （Tg）, but also can decrease the coefficient of thermal expansion （CTE） of the coating. Electrochemical impedance spectroscopy （EIS） was used to evaluate the barrier properties of the coatings containing different volume fractions of ultra-short glass fibers. The EIS results showed that the coating had the best barrier property when it contained 20% （volume fraction） ultra-short glass fibers. The functions of the ultra-short glass fibers in epoxy coating are two fold： first, they can improve the coating mechanical properties as reinforcement materials; second, they parallel to the substrate and inhibit the corrosive medium to pass through the coating.

关键词： Glass fiber Barrier Electrochemical impedance spectroscopy Thermal expansion

ANALYSIS OF NONLINEAR DYNAMIC RESPONSE FOR VISCOELASTIC COMPOSITE PLATE WITH TRANSVERSE MATRIX CRACKS

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Acta Mechanica Solida Sinica 2004年第3期17卷 230-238页

作者： FuYiming LiPing＇en ZhengYufang DepartmentofengineeringMechanics HunanUniversityChangsha410082China

Based on the Schapery three-dimensional viscoelastic constitutive relationship with growing damage, a damage model with transverse matrix cracks for the unidirectional ?bre rein- forced viscoelastic composite plates is developed. By using Karman theory, the nonlinear dynamic governing equations of the viscoelastic composite plates under transverse periodic loading are es- tablished. By applying the ?nite di?erence method in spatial domain and the Newton-Newmark method in time domain, and using the iterative procedure, the integral-partial di?erential gov- erning equations are solved. Some examples are given and the results are compared with available data.

关键词： viscoelastic composite plate transverse matrix cracks damage evolution equation nonlinear dynamic response

Bioorthogonal chemistry based on-demand drug delivery system in cancer therapy

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Frontiers of Chemical Science and engineering 2023年第4期17卷 483-489页

作者： Lan Lin Lai Jiang en Ren Gang Liu State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics&Center for Molecular Imaging and Translational Medicine School of Public HealthXiamen UniversityXiamen 361102China

Benefiting from the advantage of taking place in biological environments without interfering with an innate biochemical process,the bioorthogonal reaction that commonly contains the“bond formation”and“bond cleavage”system has been widely used in targeted therapy for a variety of ***,several prominent cases based on the bioorthogonal reaction that tailoring the metabolic glycoengineering tactics to modified cells for cancer immunotherapy,and the innovative tactics for reducing the metal ions’toxic and side effects with microneedle patches will be *** on these applications,the complexities,potential pitfalls,and opportunities of bioorthogonal chemistry in future cancer therapy will be evaluated.

关键词： bioorthogonal reaction cancer therapy metabolic glycoengineering bioorthogonal catalytic patch

Fabrication of taxifolin loaded zein-caseinate nanoparticles and its bioavailability in rats

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Food Science and Human Wellness 2023年第6期12卷 2306-2313页

作者： Ying Li Hang Su Wenjun Wang Zhongping Yin Jing’en Li en Yuan Qingfeng Zhang Jiangxi Key Laboratory of Natural Product and Functional Food College of Food Science and EngineeringJiangxi Agricultural UniversityNanchang 330045China College of Pharmacy Jiangxi University of Traditional Chinese MedicineNanchang 330006China

Taxifolin loaded zein-caseinate nanoparticles(TZP)were fabricated by the anti-solvent method and were used as an oral delivery vehicle to improve their bioavailability in the *** formulations of TZP were *** mass ratio of 1:1:2 between taxifolin,zein and sodium caseinate,the particle size andζpotential of TZP were(168.74±0.35)nm and−(57.67±0.25)mV,while the encapsulation and loading efficiency of taxifolin were(85.83±0.89)%and(17.11±0.88)%,*** freeze-drying,TZP exhibited excellent redispersibility in water without *** characterization showed that taxifolin existed in amorphous form in TZP and its interaction with the protein was *** encapsulating in TZP,the excellent dispersion of taxifolin in water signifi cantly improve its diffusion velocity through a semipermeable *** oral administration,taxifolin and its 5 metabolites were identifi ed in rat plasma by ultra high performance liquid chromatography(UPLC)with quadrupole time-of-flight mass spectrometry(UPLC-QTOF-MS).The dynamic variation of taxifolin and its metabolites in plasma were then quantifi ed by UPLC with a triple-quadrupole typemass spectroscopy(UPLC-QqQ-MS/MS).A pharmacokinetic study showed that the bioavailability of taxifolin increased from 0.35%to 0.52%through TZP *** plasma concentration of taxifolin glucuronide and methylated taxifolin glucuronide was much higher than *** was the dominating metabolism pathway of taxifolin in vivo.

关键词： Taxifolin Zein nanoparticles Characterization Bioavailability