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surface characteristics of Mussel-inspired Polydopamine Coating on Titanium Substrates

Journal of Wuhan University of Technology(Materials Science) 2014年第1期29卷 197-200页

作者：姜玲 JIN Guangchun KANG Jiyeon YU Lingmin YOON Wookang LIM MyungJin PAR K Ilsong LEE Minho JIN Dongchun Yantai Affiliated Hospital of Binzhou Medical University Oral Medical College Beihua University Department of Oral and Maxillofacial Surgery Hallym University Dongtan Sacred Heart Hospital Department of Dental Biomaterials and Institute of Oral Bioscience School of Dentistry BK21 Project Chonbuk National University Department of Veterinary Yanbian University

Mussel adhesive proteins are non-toxic, biodegradable and have low immunogenic qualities that make them highly attractive for medical purposes compared with man-made materials. 3,4-DOPA, which is a dopamine precursor, is a critical element for achieving mussel-like adhesive properties. In present study, polydopamine was coated onto the titanium surfaces by dipping in a 2 mg/mL dopamine solution in 10 mM Tris- HCl buffer at pH 8.5. EDX element analysis and Raman spectroscopic analysis of the surface were conducted to verify the formation of polydopamine. The surface characteristics of polydopamine-coated titanium plates were observed by SEM and AFM. Hydrophilicity and corrosion-resistance were also evaluated by static contact angle measurements and potentiodynamic polarization corrosion tests. The absorption intensity for pH-induced polymerization rapidly increased for the initial four hours and thereafter smoothly increased. EDX element analyses revealed that the content of carbon and oxygen increased and the content of titanium decreased after the coating process. In the Raman spectra, polydopamine resulted in two new peaks at approximately 1 370 and 1 570 cm^-1 resulting from the stretching and deformation of catechol. Microstructural features revealed that nanometer-sized bright granules were randomly distributed after coating, and these nanoparticles grew with increased coating time. The Ra values of polydopamine-coated titanium plates were showed to increase with coating time. Compared to the pure titanium curve, the inflection point of polydopamine-coated titanium was located at a higher corrosion potential and lower corrosion current density. Findings from our research suggested that polydopamine coatings offer a versatile approach for titanium surface modification.

关键词： surface modification titanium polydopamine surface characteristics

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surface characteristics and wetting mechanism of respirable coal dust

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Mining Science and Technology 2010年第3期20卷 365-371页

作者： YANG Jing WU Xiukun GAO Jianguang LI Gaiping Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266510China

In this study,FTIR and XPS spectroscopy,specific surface area and pore size analyses,wetting and other experimental means have been applied to investigate respirable coal dust surface properties and wetting *** research shows that coal dust surface structures,chemical and element compositions are changed in the refining process of coal *** with large particle coal dust,respirable coal dust is a weak hydrophilic and strong hydrophobic *** reason:the smaller the particle size of coal dust,the more unsaturated its *** absorption of air is strong and it is easy to form an air film on coal dust surfaces. Coal dust contact with water is actually a compound contact of liquid in contact with a solid and gas in contact with a solid. The smaller the particle size,the larger the pore volume and the higher the degree of surface roughness,the larger the area of gas in contact with a solid and the worse the coal dust *** reason is that the changes in the composition of atoms on the dust surface and structures affect coal dust *** results of this study establish a theoretical basis for the invention of effective reduced-dust technology.

关键词： respirable coal dust wetting surface characteristics

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surface characteristics of microalgae and their effects on harvesting performance by air flotation

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 125-133页

作者： Wen Hao Li Yanpeng Shen Zhou Ren Xiangying Zhang Wenjun Liu Jun Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas Chang’an UniversityXi’an 710054China School of Environmental Science and Engineering Chang’an UniversityXi’an 710054China School of Materials Science and Engineering Chang’an UniversityXi’an 710054China

Flotation is considered as an effective and energy efficient method for harvesting ***,the interaction mechanism between bubble-algae cell and cell-cell interfacial boundaries in microalgae flotation is not completely *** better understand the effects of surface characteristics on microalgae flotation performance,the hydrophobicity and the zeta potential of two different microalgae species were quantified based on experimental measurements and the extended DLVO(Derjagin–Landau–Verwey–Overbeek)*** experiments were then carried out and the effects of surface characteristics on microalgae flotation performance were *** Chlorella vulgaris and Anabaena vasriabilis show naturally hydrophilic and hydrophobic properties,*** addition of a cationic surfactant(C16TAB)can modify hydrophilic microalgae cells into hydrophobic and further Chlorella hydrophobicity is enhanced with increased C16TAB *** zeta potentials of both algae strains are negative in the tested pH *** with Chlorella vulgaris,the magnitude of zeta potential of Anabaena vasriabilis is found larger at the same pH,resulting in a more dispersed distribution in the *** addition,flotation experiments demonstrated that microalgae hydrophobicity and zeta potential have significant impacts on the harvesting efficiency and concentration *** hydrophobic attraction is found to play a more important role in determining the harvesting performance than electrostatic repulsion between the interacting surfaces,especially for hydrophobicity algae in the present ***,the highest flotation efficiency and the highest concentration factor could not be concurrently obtained for both algae strains,suggesting that optimized flotation conditions should be selected as a compromise.

关键词： microalgae air flotation harvesting performance surface characteristics zeta potential hydrophobicity

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surface characteristics of rapidly solidified nickel-based superalloy pow-ders prepared by PREP

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Rare Metals 2003年第4期22卷 309-314页

作者： CHEN Huanming , HU Benfu , and LI Huiying1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China2) School of Physics and Electrical Information Engineering, Ningxia University, Yinchuan 750021, China School of Materials Science and Engineering University of Science and Technology Beijing 北京 100083

The surface microstructure and the surface segregation of FGH 95 nickel-basedsuperalloy powders prepared through plasma rotating electrode processing (PREP) have beeninvestigated by using SEM and AES. The results indicate that the surface microstructure of powderschanges from dendrite into cellular stricture as the particle size of powders decrease, and thepredominant precipitates solidified on the particle surfaces were identified as MC' type carbidesenriched with Nb and Ti. It was also indicated that along with the depth of particle surfaces, thesegregation layer of S, C and O elements are thick, and that of Ti, Cr elements are thin for largesire powders while they are in reverse for median size particles.

关键词： FGH 95 nickel-based superalloy powders surface characteristics microstructure plasma rotating electrode processing

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Research on surface characteristics of non-traditional finishing

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第10期6卷 1152-1157页

作者：李邦忠周锦进 College of Mechanical Engineering Dalian University of Technology Dalian 116023ChinaCollege of Mechanical Engineering Dalian University Dalian 116622China College of Mechanical Engineering Dalian University of Technology Dalian 116023China

This paper reports results of investigations of some surface characteristics, and resulting performance of parts proc-essed using non-traditional finishing methods. The friction factor, precision keeping and anti-conglutination performance of the finished surfaces are considered, and surface characteristics such as microtopography and machining texture were investigated. The overall performance of surfaces finished using non-traditional finishing methods was found to be significantly better than that of traditional finishing methods.

关键词： Non-traditional finishing surface characteristics Machining texture Microtopography

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Role of biochar surface characteristics in the adsorption of aromatic compounds:Pore structure and functional groups

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Chinese Chemical Letters 2021年第10期32卷 2939-2946页

作者： Xue-Fei Tan Shi-Shu Zhu Ru-Peng Wang Yi-Di Chen Pau-Loke Show Feng-Fa Zhang Shih-Hsin Ho College of Materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbinShenzhen 518055China Institute of Technology(Shenzhen) Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham Malaysia43500 SemenyihSelangorMalaysia

Biochar(BC)are widely used as highly efficient adsorbents to alleviate aromatics-based contaminants due to their ease of preparation,wide availability,and high *** surface properties of BCs usually vary greatly due to their complex chemical constituents and different preparation processes and are reflected in the values of parameters such as the specific surface area(SSA),pore volume/size,and surface functional groups(SFGs).The effects of SSA and pore volume/size on the adsorption of aromatics have been widely ***,the corresponding mechanisms of BC SFGs towards aromatics adsorption remains unclear as the compositions of the SFGs are usually complex and hard to *** address in this gap in the literature,this review introduces a new perspective on the adsorption mechanisms of *** collecting previously-reported results,the parameters log P(logarithm of the Kow),polar surface area,and the positive/negative charges were carefully calculated using Chem Draw3D,which allowed the hydrophobicity/hydrophilicity properties,electron donor-acceptor interactions,Hbonding,and electrostatic interactions between SFGs and aromatics-based contaminates to be inferred *** predictions were consistent with the reported results and showed that tailor-made BCs can be designed according to the molecular weights,chemical structures,and polarities of the target ***,this review provides new insight into predicting the physicochemical properties of BCs through revealing the relationship between SFGs and adsorbates,which may provide useful guidance for the preparing of highly-efficient,functional BCs for the adsorption of aromatics.

关键词： Biochar surface characteristics Aromatics Adsorption surface functional groups

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surface characteristics and mechanical behavior of retrieved orthodontic microimplants

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第5期19卷 372-382页

作者： Lu LU Hyo-Sang PARK Department of Orthodontics School of DentistryKyungpook National UniversityDalgubuldaero 2175(Samduk 2-Ga)Jung-GuDaegu 41940Korea

Objectives： To observe the surface characteristics and mechanical behavior of retrieved microimplants under clinically simulating experimental conditions and to investigate the feasibility of rouse of microimplants. Materials and methods： The microimplants, inserted at different angles, were retrieved from the patients （RMIP） and the artificial bone （RMIA）. surface characteristics, including morphologic changes of tips and thread edges, length reduction, and surface compositional variation, were evaluated using a field emission scanning electron microscope, a stereoscopic microscope, and energy-dispersive X-ray spectroscopy, respectively. Mechanical behavior comprising maximum insertion torque （MIT） and insertion time was tested with the artificial bone under clinically simulating conditions. Results： The tips and thread edges were worn out to various degrees in retrieved microimplants and thin deposits were observed on the surface in the RMIP group. Traces of foreign elements, such as iron, sulphur, and calcium, were detected on the surface of RMIP. Both MIT and insertion time of retrieved microimplants were increased compared to their initial use, and were much greater in RMIP. The increases of MIT were seen in all groups inserted at the insertion angle of 45~ compared with 90~, although the differences were not statistically significant. Conclusions： Retrieved microimplants exhibited different degrees of changes on surface characteristics and mechanical behavior, with more changes in RMIP. The reuse of microimplants for immediate relocation in the same patient may be acceptable; however, postponed relocation and allogeneic reuse of microimplants are not recommended in clinical practice.

关键词： Orthodontic microimplant surface characteristics Mechanical behavior Retrieval analysis

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CHANGE OF surface characteristics DURINGOXYGEN BLEACHING OF SULPHATE PULP

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Journal of Northeast Forestry University 1996年第2期7卷 60-62页

作者：钱学仁于钢王凤君

The change of surface characteristics during oxygen bleaching of sulphate pulp was analysed by using ESCA. The results show that oxygen to carbon ratios gradually increase andbinding staes of carbon markedly change du... 详细信息

关键词： Sulphate pulp surface characteristics ESCA

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Spatial interfacial heat transfer and surface characteristics during gravity casting of A356 alloy

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 43-50页

作者： Jia-hua LIN Hai-dong ZHAO Jia-min HUANG National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou 510641 China

As one of the key boundary conditions during casting solidification process, the interfacial heat transfer coefficient (IHTC) affects the temperature variation and distribution. Based on the improved nonlinear estimation method (NEM), thermal measurements near both bottom and lateral metal-mold interfaces throughout A356 gravity casting process were carried out and applied to solving the inverse heat conduction problem (IHCP). Finite element method (FEM) is employed for modeling transient thermal fields implementing a developed NEM interface program to quantify transient IHTCs. It is found that IHTCs at the lateral interface become stable after the volumetric shrinkage of casting while those of the bottom interface reach the steady period once a surface layer has solidified. The stable value of bottom IHTCs is 750 W/(m^2·℃), which is approximately 3 times that at the lateral interface. Further analysis of the interplay between spatial IHTCs and observed surface morphology reveals that spatial heat transfer across casting-mold interfaces is the direct result of different interface evolution during solidification process.

关键词： A356 alloy solidification interfacial heat transfer coefficient inverse heat conduction problem surface characteristics

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Comparison of surface characteristics of Mesoporous Titania Prepared in Matrix-Free Solutions and Using Triton X Reverse Micelles

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Materials Sciences and Applications 2020年第11期11卷 715-732页

作者： Polyxeni Paschalidou Charis R. Theocharis Porous Solids Group Department of Chemistry University of Cyprus Nicosia Cyprus

Titania nanoparticles have been prepared from the precursor compound Ti(OiPr)4 using Triton X reverse micelles with varying surfactant tail, in a matrix-free aqueous (pH 2) and in non-aqueous phase (benzyl alcohol and glacial acetic acid, solvothermal method). The importance of this work lies in the further elucidation in the synthetic methodology of preparing well-characterized nanoporous solids. Comparison of the texture characteristics and surface properties of the samples prepared from each technique, was carried out using physicochemical techniques: pXRD, ΒΕΤ/DFT/BJH, FTIR, DRUV-Vis and SEM. The results show that the use of Triton X reverse micelles with varying surfactant size results in TiO2 solids with adjustable surface characteristics in contrast to matrix-free. Specifically, samples of the latter methods present higher surface area values at lower calcination temperatures but present reduced thermal stability and control of their surface properties.

关键词： Titanium Dioxide surface characteristics Mesopores Inverse Micelles Synthesis

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