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Crystal face dependent intrinsic wettability of metal oxide surfaces

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National Science Review 2021年第1期8卷 109-116页

作者： Zhongpeng Zhu Zhenwei Yu Frank F.Yun Deng Pan Ye Tian Lei Jiang Xiaolin Wang Key Laboratory of Bio-inspired materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of Sciences Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang University Institute for Superconducting and Electronic materials Australian Institute for Innovative MaterialsUniversity of Wollongong

Knowledge of intrinsic wettability at solid/liquid interfaces at the molecular level perspective is significant in understanding crucial progress in some fields, such as electrochemistry, molecular biology and earth science. It is generally believed that surface wettability is determined by the surface chemical component and surface topography. However, when taking molecular structures and interactions into consideration,many intriguing phenomena would enrich or even redress our understanding of surface wettability. From the perspective of interfacial water molecule structures, here, we discovered that the intrinsic wettability of crystal metal oxide is not only dependent on the chemical components but also critically dependent on the crystal faces. For example, the （1■02） crystal face of α-Al;O;is intrinsically hydrophobic with a water contact angle near 90°, while another three crystal faces are intrinsically hydrophilic with water contact angles <65°. Based on surface energy analysis, it is found that the total surface energy, polar component and Lewis base portion of the hydrophobic crystal face are all smaller than the other three hydrophilic crystal faces indicating that they have different surface states. DFT simulation further revealed that the adsorbed interfacial water molecules on each crystal face hold various orientations. Herein, the third crucial factor for surface wettability from the perspective of the molecular level is presented, that is the orientations of adsorbed interfacial water molecules apart from the macro-level chemical component and surface topography. This study may serve as a source of inspiration for improving wetting theoretical models and designing controllable wettability at the molecular/atomic level.

关键词： anisotropic wettability α-Al2O3 interfacial water layer surface energy DFT simulation

Analysis of Magnetic Resistive Flow of Generalized Brinkman Type Nanofluid Containing Carbon Nanotubes with Ramped Heating

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Computers, materials & Continua 2021年第4期67卷 1069-1084页

作者： Muhammad Saqib Ilyas Khan Sharidan Shafie Ahmad Qushairi Mohamad El-Sayed M.Sherif Department of Mathematical Sciences Faculty of ScienceUniversiti Teknologi MalaysiaJohor Bahru81310Malaysia Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam Center of Excellence for Research in engineering materials(CEREM) King Saud UniversityAl-Riyadh11421Saudi Arabia Department of Physical Chemistry Electrochemistry and Corrosion LaboratoryNational Research CentreCairo12622Egypt

In recent times,scientists and engineers have been most attracted to electrically conducted nanofluids due to their numerous applications in various fields of science and *** example,they are used in cancer treatment(hyperthermia),magnetic resonance imaging(MRI),drugdelivery,and magnetic refrigeration(MR).Bearing in mind the significance and importance of electrically conducted nanofluids,this article aims to study an electrically conducted water-based nanofluid containing carbon nanotubes(CNTs).CNTs are of two types,single-wall carbon nanotubes(SWCNTs)and multiple-wall carbon nanotubes(MWCNTs).The CNTs(SWCNTs and MWCNTs)have been dispersed in regular water as base fluid to form waterCNTs *** Brinkman Type nanofluid model is developed in terms of time-fractional *** ramped heating and sinusoidal oscillations conditions have been taken at the *** model has been solved for exact analytical solutions via the fractional Laplace transform *** exact solutions have been graphically studied to explore the physics of various pertinent flow parameters on velocity and temperature *** empirical results reveal that the temperature and velocity fields decreased with increasing values of fractional parameters due to variation in thermal and momentum boundary *** is also indicated that the isothermal velocity and temperature are higher than ramped velocity and temperature.

关键词： Nanofluid fractional derivatives Brinkman type fluid exact solutions

Recent Advances in Pure-Organic Host-Guest Room-Temperature Phosphorescence Systems Toward Bioimaging

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Transactions of Tianjin University 2023年第6期29卷 432-443页

作者： Zhiqin Wu Yang Li Xiang Ma Key Laboratory for Advanced materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Organic room-temperature phosphorescence(RTP)materials have garnered considerable attention in the fields of biosensing,optoelectronic devices,and anticounterfeiting because of their substantial Stokes shifts,tunable emission wavelengths,and prolonged *** materials offer remarkable advantages for biological imaging applications by effectively reducing environmental autofluorescence and enhancing imaging ***,host-guest systems have been employed as efficient approaches to fabricate pure-organic RTP materials for bioimaging,providing benefits such as controllable preparation and flexible ***,an increasing number of corresponding studies are being reported;however,a comprehensive systematic review is still ***,we summarize recent advances in the development of pureorganic RTP materials using host-guest systems with regard to bioimaging,including rigid matrices and *** challenge and potential of RTP for biological imaging are also proposed to promote the biomedical applications of organic RTP materials with excellent optical properties.

关键词： Room-temperature phosphorescence Host-guest system Rigid matrix Biological imaging

Surface treatment of 3D printed porous Ti6Al4V implants by ultraviolet photofunctionalization for improved osseointegration

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Bioactive materials 2022年第1期7卷 26-38页

作者： Chuan Yin Teng Zhang Qingguang Wei Hong Cai Yan Cheng Yun Tian Huijie Leng Caimei Wang Shiqing Feng Zhongjun Liu Department of Orthopedics Peking University Third HospitalBeijing100191People’s Republic of China Department of Orthopedics Qilu Hospital of Shandong UniversityJinan250012People’s Republic of China Center for biomedical materials and Tissue engineering Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijing100871People’s Republic of China Beijing AKEC Medical Company Ltd. Beijing102200People’s Republic of China

Three-dimensional(3D)-printed porous Ti6Al4V implants play an important role in the reconstruction of bone ***,its osseointegration capacity needs to be further improved,and related methods are inadequate,especially lacking customized surface treatment ***,we aimed to design an omnidirectional radiator based on ultraviolet(UV)photofunctionalization for the surface treatment of 3D-printed porous Ti6Al4V implants,and studied its osseointegration promotion effects in vitro and in vivo,while elucidating related *** UV treatment,the porous Ti6Al4V scaffolds exhibited significantly improved hydrophilicity,cytocompatibility,and alkaline phosphatase activity,while preserving their original mechanical *** increased osteointegration strength was further proven using a rabbit condyle defect model in vivo,in which UV treatment exhibited a high efficiency in the osteointegration enhancement of porous Ti6Al4V scaffolds by increasing bone ingrowth(BI),the bone-implant contact ratio(BICR),and the mineralized/osteoid bone *** advantages of UV treatment for 3D-printed porous Ti6Al4V implants using the omnidirectional radiator in the study were as follows:1)it can significantly improve the osseointegration capacity of porous titanium implants despite the blocking out of UV rays by the porous structure;2)it can evenly treat the surface of porous implants while preserving their original topography or other morphological features;and 3)it is an easy-to-operate low-cost process,making it worthy of wide clinical application.

关键词： Three-dimensional-printed porous implants UV photofunctionalization Omnidirectional UV radiator Osseointegration

The Role of Frontal and Occipital Cortices in Processing Sustained Visual Attention in Young Adults with Attention-Deficit/Hyperactivity Disorder:A Functional Near-Infrared Spectroscopy Study

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Neuroscience Bulletin 2020年第6期36卷 659-663页

作者： Ziyan Wu Yuyang Luo Yu Gao Ying Han Kai Wu Xiaobo Li Department of Electrical and Computer engineering New Jersey Institute of TechnologyNewarkNJ 07102USA Department of biomedical engineering New Jersey Institute of TechnologyNewarkNJ 07102USA Department of Psychology Brooklyn College and the Graduate Center of the City University of New YorkBrooklynNY 10004USA Department of Neurology XuanWu Hospital of Capital Medical UniversityBeijing 100053China Beijing Institute of Geriatrics XuanWu Hospital of Capital Medical UniversityBeijing 100053China National Clinical Research Center for Geriatric Disorders Beijing 100053China Center of Alzheimer’s Disease Beijing Institute for Brain DisordersBeijing 100069China Department of biomedical engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510003China Guangzhou Huiai Hospital The Affiliated Brain Hospital of Guangzhou Medical UniversityGuangzhou 510370China Guangdong engineering Technology Research Center for Diagnosis and Rehabilitation of Dementia Guangzhou 510500China

Dear Editor,Attention deficit/hyperactivity disorder(ADHD),characterized by age-inappropriate symptoms of inattention,hyperactivity,and impulsivity,is a highly prevalent and heritable childhood-onset neurodevelopmental disorder,with impairing symptoms that persist into adulthood in up to 65%of patients[1].Adults with persistent ADHD symptoms since childhood have been found to have neurocognitive impairments in multiple domains,especially in attention and cognitive control,which significantly contribute to an increased risk of social disability,educational and occupational failure,and other comorbid psychiatric disorders,resulting in significant economic burdens to the affected individuals, their families, andsociety [2, 3].

关键词： Corti impairment Infrared

Cross-Scale Synthesis of Organic High-k Semiconductors Based on Spiro-Gridized Nanopolymers

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Research 2022年第2期2022卷 111-122页

作者： Dongqing Lin Wenhua Zhang Hang Yin Haixia Hu Yang Li He Zhang Le Wang Xinmiao Xie Hongkai Hu Yongxia Yan Haifeng Ling Jin'an Liu Yue Qian Lei Tang Yongxia Wang Chaoyang Dong Linghai Xie Hao Zhang Shasha Wang Ying Wei Xuefeng Guo Dan Lu Wei Huang centre for Molecular Systems and Organic Devices(CMSOD) State Key Laboratory of Organic Electronis and Information Displays&Institute of Advanced Materials(AM)Nanjing University of Posts.Telecommunications9 Wenyuan RoadNarnjing 210023China National Symnchrotron Radiationr Laboratory Anhui Provincial Engincering Laboratory of Advanced Functional Polymer FilmCAS Key Laboratory of Soft Matter ChemistryUniversity of Science and Technology of ChinaHgfei 230026China School of Plysics State Key Laboratory of Crystal MaterialsShandong UniversityJinanShardong 250100China Beijing National Laboratony for Molecular Scences National Biomedical Imaging CenterCollege of Chemistry and Molecular EngineeringPeking UniversityBejing 100871China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UntiversityXian 710072China State Key Laboratory of Supramolecular Structure and Materias College of Chemistyjilin University2699 Qianjin AvenueChangchun 130012China

High dielectric constants in organic semiconductors have been identified as a central challenge for the improvement in not only piexoelectric,preolecric,and freeltric efcts but also photoclecric conversion eficiency in OPVs,carrier mobility in OFETS,and charge density in charge-trapping ***,we report an ultralong persistence length(≈41 nm)efet of spiro-fused organic nanopolymers on dielectric properties,together with excitonic and charge carrier *** state-of-the-art nanopolymers,namely,nanopolyspirogrids(NPSGs),are synthesized via the simple crossscale Friedel-Crafts polygridlization of AjB-type *** high dielectric constant(k=8.43)of NPSG is firstly achieved by locking spiro-polygridization efect that results in the enhancement of dipole *** doping into a polystyrene-based dielectric layer,such a high-k feature of NPSG increases the feld-ffct carrier mobility from 0.20 to 0.90cm^(2)Vl s'in pentacene OFET ***,amorphous NPSG film exhibits an ultralow energy disorder(<50 meV)for an exellent zero-field hole mobility of 3.94×10^(-1)cm^(2)V^(-1)s^(-1).surpassing most of the amorphousπconjugated polymers Onganic nanopolymers with high dielectric constants open a new way to break through the bottleneck of eficiency and multifunctionality in the blueprint of the fourth generation semiconductors.

关键词： dielectric charge amorphous

Construction of versatile multilayered composite nanoparticles from a customized nanogel template

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Bioactive materials 2018年第1期3卷 87-96页

作者： Jian Zhang Jinpeng Jia Jimin P.Kim Fei Yang Xing Wang Hong Shen Sijia Xu Jian Yang Decheng Wu Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics&ChemistryInstitute of ChemistryChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Orthopaedics General Hospital of Chinese People's Liberation ArmyBeijingChina Department of biomedical engineering Materials Research InstituteThe Huck Institutes of the Life SciencesThe Pennsylvania State UniversityUniversity ParkPAUSA

We present a highly adaptable design platform for multi-responsive,multilayered composite nanoparticles(MC-NPs)with fine-tunable functional layers.A flexible disulfide-linked nanogel template is obtained by a controlled in-situ gelation method,enabling a high degree of control over each successive *** this template,we optimize“smart”biomaterials with biofunctional surfaces,tunable drug release kinetics,and magnetic or pH-responsive functionality,fabricated into MC-NPs for targeted drug release and periosteum-mimetic structures for controlled rhBMP-2 release towards bone tissue formation *** a versatile platform for the design of MC-NPs is a powerful tool that shows considerable therapeutic potential in clinical fields such as oncology and orthopedics.

关键词： Multilayer Multifunctional Nanoparticles Controlled Nanogel template

Unveiling the Effects of Interchain Hydrogen Bonds on Solution Gelation and Mechanical Properties of Diarylfluorene-Based Semiconductor Polymers

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Research 2020年第1期2020卷 547-561页

作者： Lubing Bai Yamin Han Chen Sun Xiang An Chuanxin Wei Wei Liu Man Xu Lili Sun Ning Sun Mengna Yu He Zhang Qi Wei Chunxiang Xu Yingguo Yang Tianshi Qin Linghai Xie Jinyi Lin Wei Huang Center for Supramolecular Optoelectronics(CSO) Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China State Key Laboratory of Bioelectronics School of Electronic Science and Medical EngineeringSoutheast UniversityNanjing 210096China Center for Molecular Systems and Organic Devices(CMSOD) Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials(IAM)Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)Shaanxi Institute of Biomedical Materials and Engineering(SIBME)Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of Sciences239 Zhangheng RoadShanghai 201204China

The intrinsically rigid and limited strain of most conjugated polymers has encouraged us to optimize the extensible properties of conjugated ***,learning from the hydrogen bonds in glucose,which were facilitated to the toughness enhancement of cellulose,we introduced interchain hydrogen bonds to polydiarylfluorene by amide-containing side *** tuning the copolymerization ratio,we systematically investigated their influence on the hierarchical condensed structures,rheology behavior,tensile performances,and optoelectronic properties of conjugated *** to the reference copolymers with a low ratio of amide units,copolymers with 30%and 40%amide units present a feature of the shearthinning process that resembled the non-Newtonian fluid,which was enabled by the interchain dynamic hydrogen ***,we developed a practical and universal method for measuring the intrinsic mechanical properties of conjugated *** demonstrated the significant impact of hydrogen bonds in solution gelation,material crystallization,and thin film ***,the breaking elongation for P4 was even up to~30%,which confirmed the partially enhanced film ductility and toughness due to the increased amide ***,polymer light-emitting devices(PLEDs)based on these copolymers presented comparable performances and stable electroluminescence(EL).Thin films of these copolymers also exhibited random laser emission with the threshold as low as 0.52μJ/cm^(2),suggesting the wide prospective application in the field of flexible optoelectronic devices.

关键词： bonds conjugated film

Enhancement of oxygen evolution reaction activity and durability of Ba0.5Sr0.5Co0.8Fe0.2O3-δ by CO2 thermal treatment

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Journal of materials Science & Technology 2019年第6期35卷 1184-1191页

作者： Fengli Liang Ziqiong Yang Haipeng Deng Jaka Sunarso Lili Yang Junkui Mao College of Energy and Power engineering.Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Research centre for Sustainable Technologies Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga93350 Kuching Sarawak Malaysia

This work demonstrates that in situ formation of carbonate layer on the surface of Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)obtained by exposure to CO2 during heating between 500℃ and 700℃ can provide enhanced oxygen evolution reaction(OER)performance and durability in an alkaline solution relative to the original *** temperatures,i.e., 500℃,600℃,and 700℃ were chosen to perform the CO2 thermal treatment,resulting into BSCF-500,BSCF-600,and BSCF-700 *** OER was enhanced in the order of BSCF-500< BSCF-700 < BSCF-600. BSCF-600 showed the best OER performance, i.e., a low overpotential of 0.36 V required to attain 10 mA cm^-2 current density as well as a mass activity of 74.14 Agcmcat-1 and a specific activity of 5.04 mA cmcat-2 at an overpotential of 0.4 V. The OER performance durability of BSCF-600 was highlighted by its ability to maintain a stable potential of around 1.61 V vs. RHE (RHE: reversible hydrogen electrode) when charged at a constant current density of 10 mA cm^-2 throughout the 800 min continuous chronopotentiometry test. The enhanced OER performance for BSCF-600 relative to the original BSCF is attributed to three factors:(i) higher electrochemically active surface area;(ii) faster charge transfer rate and higher electrical conductivity;and (iii) modified oxidation state of cobalt ions. The formation of thin carbonate layer in BSCF-600 appears to suppress the durability issue observed in BSCF.

关键词： Carbonate Electrocatalysis Oxygen evolution reaction Perovskite Water splitting