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Protective and water-repellent properties of alkylcarboxylic and alkylphosphonic acid films on technically pure magnesium

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Journal of Magnesium and Alloys 2023年第9期11卷 3272-3286页

作者： Viktoriia A.luchkina Michael S.Min'kin andrei yu luchkin yurii I.Kuznetsov Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of SciencesLeninskii Pr.31Moscow 119071Russia

The formation of superhydrophobic coatings using low-toxicity corrosion inhibitors is a promising method for corrosion protection of metals and alloys. In this study, the effects of surface roughness and the of the adsorbed substance structure on wettability and corrosion resistance of commercially pure magnesium were investigated. Surface roughness was created by three different methods: paper grinding,etching in nitric acid solution and laser treatment. Oleic, stearic and octadecylphosphonic acids were investigated as potential surface modifiers for the formation of corrosion resistant superhydrophobic coatings. It has been shown that the protective and hydrophobic properties of acid films on magnesium, as well as their stability, are determined by both the initial surface morphology and the nature of the ***, the laser treatment was found to be preferable to mechanical and chemical surface preparation and the best hydrophobic agent among the studied acids is phosphonic acid. The most stable films with excellent superhydrophobic and protective properties in atmospheres of high humidity and salt spray clamber are formed in a solution of 0.001 M octadecylphosphonic acid on the surface of magnesium with high roughness. In addition, the effect of vinyltrimethoxysilane on the protective and hydrophobic properties of stearic acid and octadecylphosphonic acid films was investigated. The results of direct corrosion tests and wetting contact angle degradation kinetics studies showed that the protective and hydrophobic properties of stearic acid can be enhanced by its layer-by-layer adsorption with *** practically reach the parameters of octadecylphosphonic acid.

关键词： Magnesium Corrosion inhibitors Superhydrophobic coatings Alkylcarboxylic acids Alkylphosphonic acid

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Shell stand:Stable thin shell models for 3D fabrication

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Computational Visual Media 2024年第4期10卷 643-657页

作者： yu Xing Xiaoxuan Wang Lin Lu andrei Sharf Daniel Cohen-Or Changhe Tu School of Computer Science and Technology Shandong UniversityQingdao 266237China Department of Computer Science Ben-Gurion UniversityBeer-Sheva 84105Israel Department of Computer Science Tel-Aviv UniversityTel Aviv 6997801Israel

A thin shell model refers to a surface or structure,where the object’s thickness is considered *** the context of 3D printing,thin shell models are characterized by having lightweight,hollow structures,and reduced material *** versatility and visual appeal make them popular in various fields,such as cloth simulation,character skinning,and for thin-walled structures like leaves,paper,or metal ***,optimization of thin shell models without external support remains a challenge due to their minimal interior operational *** the same reasons,hollowing methods are also unsuitable for this *** fact,thin shell modulation methods are required to preserve the visual appearance of a two-sided surface which further constrain the problem *** this paper,we introduce a new visual disparity metric tailored for shell models,integrating local details and global shape attributes in terms of visual *** method modulates thin shell models using global deformations and local thickening while accounting for visual saliency,stability,and structural ***,thin shell models such as bas-reliefs,hollow shapes,and cloth can be stabilized to stand in arbitrary orientations,making them ideal for 3D printing.

关键词： surface models thin shell models optimization balance stability 3D fabrication

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Recyclingg plastic Waste into multifunctional superhydrophobic textiles

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Nano Research 2022年第11期15卷 9921-9925页

作者： Qinglang Ma Zhiying Wu Vlad andrei Neacșu Sai Zhao yu Chai Hua Zhang Frontiers Science Center for High Energy Material Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsKey Laboratory of Cluster ScienceMinistry of EducationAdvanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemistry City University of Hong KongHong Kong 999077China Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong Kong 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Department of Physics City University of Hong KongHong Kong 999077China

The plastic pollution has become one of the top environmental *** effort has been devoted into recycling waste plastic materials in a facile and economical *** this work,we have successfully recycled a common type of plastic waste,i.e.,polystyrene(PS),into value-added functional materials through a cost-effective and facile dip-coating *** resulted mixture of waste PS and SiO_(2),referred to as PS/SiO_(2),coated textile material is superhydrophobic and superoleophilic,showing an excellent resistance towards corrosive solutions(acid,alkaline,and saline),high temperature treatment,and mechanical *** a proof-of-concept application,the PS/SiO_(2)-coated textile is used to selectively separate oil/water mixtures through either absorption or filtration *** also exhibits a surface self-cleaning property,which may be used as fabrics for dust-preventing *** work offers a new strategy to treat the waste for preparation of novel low-cost superhydrophobic materials for various applications.

关键词： waste recycling superhydrophobic oil water separation self-cleaning

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Evidence for polarization-induced phase transformations and degradation in CH_(3)NH_(3)PbI_(3)

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Nano Research 2023年第7期16卷 9435-9442页

作者： Aleksei yu.Grishko Maria A.Komkova Ekaterina I.Marchenko Alexandra V.Chumakova Alexey B.Tarasov Eugene A.Goodilin andrei A.Eliseev Department of Materials Science MSU-BIT UniversityShenzhen 517182China Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia Department of Materials Science Lomonosov Moscow State UniversityMoscow 119991Russia European Synchrotron Radiation Facility F-38042 GrenobleFrance

In solar cells,hybrid halide perovskites operate under constant bias,thus their stability towards electric field-induced degradation is of key *** we report on evidence of previously unidentified electric field-induced transitions and degradation path of CH_(3)NH_(3)PbI_(3)(MAPbI_(3))using elemental and phase *** films of MAPbI_(3) were deposited onto 1-2μm-pitch interdigitated electrodes and subjected to direct current(DC)-*** MAPbI_(3) layer polarized with<0.8 V/μm DC electric field undergoes pronounced ion redistribution to methylammonium-rich MAPbI_(3)-y(y<0.6)and iodine-rich MA1-xPbI3(x<0.3)***-induced loss of both methylammonium and iodine provokes degradation of MAPbI_(3).Using nanofocus grazing-incidence wide-angle X-ray scattering(GIWAXS),we unambiguously showed that the bias voltage induces the transformation ofβ-MAPbI_(3) to metastableδ-MAPbI_(3) polymorph via alignment of polar organic cation with the electric *** transformation is partially reversible upon field ***,once formed,δ-MAPbI_(3) disrupts the morphology of pristine film and undergoes decomposition toβ-MAPbI_(3)(β-MAPI)and PbI_(2).With the aforementioned compositional and phase changes,only MA-rich part serves as the charge separation layer,while the I-rich excitation is blocked with the PbI_(2) barrier serving as holes trapping *** observations reveal the intermediate steps in electric-field-driven degradation of halide perovskites and show the role of polar cations in the process,which is instructive for further material design with higher stability metrics.

关键词： halide perovskites stability degradation electric field ionic conductivity stoichiometry

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氧化钴和氮掺杂碳纳米管纳米复合物的催化与容量性质(英文)

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催化学报 2014年第6期35卷 960-969页

作者： Olga yu.Podyacheva andrei I.Stadnichenko Svetlana A.Yashnik Olga A.Stonkus Elena M.Slavinskaya andrei I.Boronin andrei V.Puzynin Zinfer R.Ismagilov Boreskov Institute of Catalysis Pr.Akademika Lavrentieva 5 Novosibirsk 630090 Russia Novosibirsk State University Ul.Pirogova 2 Novosibirsk 630090 Russia Institute of Coal Chemistry and Material Science Pr.Sovetskiy 18 Kemerovo 650000 Russia

The nanocomposites based on cobalt oxide and nitrogen-doped carbon nanofibers (N-CNFs) with cobalt oxide contents of 10–90 wt% were examined as catalysts in the CO oxidation and supercapacity electrodes. Depending on Со3О4 content, such nanocomposites have different morphologies of cobalt oxide nanoparticles, distributions over the bulk, and ratios of Со3+/Co2+ cations. The 90%Со3О4-N-CNFs nanocomposite showed the best activity because of the increased concentration of defects in N-CNFs. The capacitance of electrodes containing 10%Со3О4-N-CNFs was 95 F/g, which is 1.7 times higher than electrodes made from N-CNFs.

关键词：纳米复合材料碳纳米纤维氧化催化剂氧化物钴含量氮掺杂特性容量

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Continuous wafer-scale graphene on cubic-SiC（O01）

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Nano Research 2013年第8期6卷 562-570页

作者： Alexander N. Chaika Olga V. Molodtsova Alexei A. Zakharov Dmitry Marchenko Jaime Sanchez-Barrig andrei Varykhalov Igor V. Shvets Victor yu. Aristov Institute of Solid State Physics RAS Chemogolovka Moscow District 142432 Russia Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) School of Physics Trinity College Dublin 2 Ireland HASYLAB at DESY D-22607 Hamburg Germany MAX-lab Lund University Box 118 22100 Lund Sweden Helmholtz-Zentrum Berlin für Materialien und Energie D- 12489 Berlin Germany

The atomic and electronic structure of graphene synthesized on commercially available cubic-SiC（001）/Si（001） wafers have been studied by low energy electron microscopy （LEEM）, scanning tunneling microscopy （STM）, low energy electron diffraction （LEED）, and angle resolved photoelectron spectroscopy （ARPES）. LEEM and STM data prove the wafer-scale continuity and uniform thickness of the graphene overlayer on SIC（001）. LEEM, STM and ARPES studies reveal that the graphene overlayer on SIC（001） consists of only a few monolayers with physical properties of quasi-freestanding graphene. Atomically resolved STM and micro-LEED data show that the top graphene layer consists of nanometer-sized domains with four different lattice orientations connected through the 〈110〉-directed boundaries. ARPES studies reveal the typical electron spectrum of graphene with the Dirac points close to the Fermi level. Thus, the use of technologically relevant SiC（001）/Si（001） wafers for graphene fabrication repre-sents a realistic way of bridging the gap between the outstanding properties of graphene and their applications.

关键词： graphene cubic-SiC(001) STM ARPES LEEM LEED

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Photoluminescence control by hyperbolic metamaterials and metasurfaces:a review

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Opto-Electronic Advances 2021年第8期4卷 30-56页

作者： Leonid yu.Beliaev Osamu Takayama Pavel N.Melentiev andrei V.Lavrinenko DTU Fotonik-Department of Photonics Engineering Technical University of Denmark0rsteds Plads 343DK-2800 Kgs.LyngbyDenmark Institute of Spectroscopy RAS Moscow 108840Russia Higher School of Economics National Research UniversityMoscow 101000Russia

Photolu min esce nee in clud ing fluoresce nee plays a great role in a wide variety of applicati ons from biomedical sensing and imag ing to optoelectr on ***,the enhan ceme nt and con trol of photolu min esce nee has imme nse impact on both fun dame ntal scie ntific research and aforeme nti oned applicati *** various nano phot tonic schemes and nanostructures to enhance the photoluminescence,we focus on a certain type of nanostructures,hyperbolic metamaterials(HMMs).HMMs are highly ani sotropic metamaterials,which produce intense localized electric ***,HMMs n aturally boost photolu min esce nee from dye molecules,qua ntum dots,n itroge n-vaca ncy cen ters in diam on ds,perovskites and tra nsiti on metal dichalcoge *** provide an overview of various con figuratio ns of HMMs,i nclud ing metal-dielectric multilayers,trenches,metallic nanowires,and cavity structures fabricated with the use of noble metals,transparent conductive oxides,and refractory metals as plasmonic *** also discuss lasing action realized with HMMs.

关键词： fluorescence metamaterials metasurfaces Purcell effect nanophotonics hyperbolic metamaterials

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A novel self-promoted Morita-Baylis-Hillman-like dimerization

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Chinese Science Bulletin 2010年第25期55卷 2794-2798页

作者： LI Qiang WongKhan Kittiya LUO XianCai Batsanov andrei S Howard Judith A K LAN yu WU yunDong Marder Todd B LEI AiWen College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China Department of Chemistry Durham University South Road Durham DH1 3LE UK College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

While stable in CH2Cl2, hexane or THF, in the presence of MeOH, self-promoted dimerization of the triarylphosphine-alkene 1, a ligand for Pd-catalyzed reactions, produced an unusual racemic bis(phosphine) 2 in high yield. The reaction of 2 with Pd(dba)2, followed by oxidative addition of p-IC6H4NO2, yielded a trans-chelated Pd(Ⅱ) aryl iodide complex.

关键词：二聚体催化反应二氯甲烷四氢呋喃氧化加成 DBA 芳基碘烯烃

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Comparison of growth mechanisms of undoped and nitrogen-doped carbon nanofibers on nickel-containing catalysts

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Chinese Journal of Catalysis 2016年第1期37卷 169-176页

作者： Vladimir V.Chesnokov Olga yu.Podyacheva Alexander N.Shmakov Lidiya S.Kibis andrei I.Boronin Zinfer R.Ismagilov 鲍列斯科夫催化研究所新西伯利亚国立大学煤炭化学和材料科学研究所

The growth mechanisms of carbon nanofibers on Ni catalysts and nitrogen-doped carbon nanofibers on Ni and Ni-Cu catalysts were *** growth of both types of nanofibers was found to occur by a mechanism that included the formation of surface non-stoichiometric nickel carbide followed by the dissolution and diffusion of carbon,or carbon and nitrogen into the bulk of the catalyst particles.

关键词： Carbon nanofibers Nitrogen doping Growth mechanism Nickel-based catalyst

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Artificial enhancement of sturgeon stock in freshwater reservoirs:A case study on sterlet Acipenser ruthenus of the Kama reservoir

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Aquaculture and Fisheries 2024年第2期9卷 287-294页

作者： Pavel B.Mikheev Semyon N.Kazarinov Alla G.Melnikova Stanislav V.Ponosov Nikolai G.Petrenko andrei I.Nikiforov Alexey yu Puzik Olga N.Elchenkova Perm State National Research University Perm614990Russia Khabarovsk Branch of the Federal State Budget Scientific Institution“Russian Federal Research Institute of Fisheries and Oceanography”“KhabarovskNIRO” Khabarovsk680038Russia Perm Branch of the Federal State Budget Scientific Institution“Russian Federal Research Institute of Fisheries and Oceanography”“PermNIRO” Perm614991Russia Federal State Budget Scientific Institution“Russian Federal Research Institute of Fisheries and Oceanography”“VNIRO” Moscow117454Russia Moscow State Institute of International Relations(University)of the Ministry for Foreign Affairs of Russia“MGIMO” Moscow117454Russia Department of State Control Supervision and Protection of Aquatic Biological Resources for Perm KraiMiddle-Volga Regional Office of the Federal Fishery AgencyPerm614990Russia

The paper presents the results of the sterlet sturgeon Acipenser ruthenus reintroduction into the Kama Reservoir(Perm Krai,Russia)by sterlet fry from hatcheries into the reservoir since *** effectiveness of hatchery releases was evaluated by monitoring gillnet sampling *** results showed that the species was reported throughout entire Kama Reservoir,which contrasts with 1988-1994 data,when the species was registered only at the upper part of the reservoir near the Kama River *** highest number and biomass values of catch per unit effort(CPUE)of the sterlet were found in submerged river channels-the deepest habitats with flow conditions which are close to the ecological requirements of the *** distribution of the sterlet within the channel biotopes of the reservoir is defined by reduced *** biggest individuals and the widest size range of the sterlet were typical for the upper area of the reservoir and Chusovskoy Bay,which have the greatest *** smallest sizes were typical for fish from catches near the dam of the reservoir,which is consistent with the published data on the distribution of sterlet in reservoir *** presented results may indicate the artificial formation of the sterlet stock in the Kama Reservoir maintained by hatchery *** revealed distribution of the sterlet in the reservoir determines the direction of further research on natural reproduction and thus formation of an artificially formed ***,future studies are required to assess the possibility of hybridization of the sterlet of artificial origin with natural populations of the species,since the low genetic diversity of the sterlet released into the Kama Reservoir which can lead to irreversible loss of genetic individuality of the natural stocks of the species in the catchment of upper course of the Kama River.

关键词： Sterlet Acipenser ruthenus Kama reservoir Hatchery releases CPUE Artificial stock formation

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