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Hou Z, Wu K, Wei H, Chi H, Xi Y, Ma L, Lin X. Strong metal-support interactions of TiO 2 interface-loaded Pt constructed under different atmospheres for adjusting the hydrogen storage reaction performance of N-ethylcarbazole. RSC Adv 2024; 14:27310-27322. [PMID: 39205933 PMCID: PMC11350403 DOI: 10.1039/d4ra03386h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 08/08/2024] [Indexed: 09/04/2024] Open
Abstract
In this study, two series of samples (rT-Pt/TiO2 prepared with a hydrogen pretreatment and Tr-Pt/TiO2 prepared with an oxygen pretreatment) were prepared by treating commercial TiO2 supports in different atmospheres to establish different TiO2 interfacial structures, followed by the addition of platinum nanoparticles (NPs) for the catalyzed hydrogenation/dehydrogenation cycle of N-ethylcarbazole (NEC). The kinetic analysis and reaction mechanism were investigated by combining XRD, Raman, CO-DRIFT, HRTEM, XPS, H2-TPD and DFT calculations. It was found that the performance of the samples for the NEC system's cyclic hydrogen storage could be modulated by treating the TiO2 interfacial structure with different atmospheres varying the extent of strong metal-support interaction (SMSI). In addition, a turnover frequency (TOF) of 191.52 min-1 for dehydrogenation was achieved at 170 °C, which is better than the previously reported catalysts. Experimental studies (characterization and kinetic studies) and DFT calculations confirmed that the SMSI of the Tr-Pt/TiO2 series samples promoted the escape of H2 and enhanced the catalytic activity for 4H-NEC in the 12H-NEC dehydrogenation reaction. In the NEC hydrogenation reaction, the rT-Pt/TiO2 series samples were pretreated with H2 before loading platinum metal, which led to the early activation of Ti4+ in their carriers, and thus suppressed the SMSI effect of the reduction process after loading platinum. This process caused the interface formed by rT-Pt/TiO2 to have a higher energy barrier to 6H-NEC, which is an intermediate product of the NEC hydrogenation process, and this interrupted the hydrogenation process of 6H-NEC.
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Affiliation(s)
- Zhengjian Hou
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
| | - Ke Wu
- Changqing Engineering Design Co. Ltd, PetroChina Changqing Oilfield Company Xi'an 710000 Shanxi China
| | - Huijie Wei
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
| | - Hua Chi
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
| | - Yanyan Xi
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
- Advanced Chemical Engineering and Energy Materials Research Center, China University of Petroleum (East China) Qingdao 266580 P. R. China
| | - Lishuang Ma
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China) Qingdao 266580 P. R. China
| | - Xufeng Lin
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China) Qingdao 266580 P. R. China +86-532-86984695
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China) Qingdao 266580 P. R. China
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Siwińska-Ciesielczyk K, Andrzejczak A, Jesionowski T, Gierz Ł, Marcinkowska A, Robakowska M. New Insights into the Application of Biocompatible (Un)Modified TiO 2 and TiO 2-ZrO 2 Oxide Fillers in Light-Curing Materials. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2908. [PMID: 38930277 PMCID: PMC11205033 DOI: 10.3390/ma17122908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 06/04/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024]
Abstract
A novel UV-light-curable poly(ethylene glycol) diacrylate matrix composite material with unmodified and methacryloxyl-grafted TiO2 and TiO2-ZrO2 systems was developed and tested as a potential coating material for medical components. The main goal of the research was to evaluate how the addition of (un)modified inorganic oxide fillers affects the properties of the composition (viscosity, UV/Vis spectra), the kinetics of photocuring (photo-DSC), and the morphological (SEM), physicochemical, and thermal properties (DSC, TGA) of the resulting composites. The applied filler functionalization process decreased their polarity and changed their size, BET surface area, and pore volume, which influenced the viscosity and kinetics of the photocurable system. In addition, the addition of synthesized fillers reduced the polymer's glass transition temperature and increased its thermal stability. It was also observed that additional UV irradiation of the tested composite changed its surface, resulting in hydrophobic properties (with the addition of 7 wt.% filler, an increase in the contact angle by more than 45% was observed).
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Affiliation(s)
- Katarzyna Siwińska-Ciesielczyk
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (K.S.-C.); (A.A.); (T.J.); (A.M.)
| | - Angelika Andrzejczak
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (K.S.-C.); (A.A.); (T.J.); (A.M.)
| | - Teofil Jesionowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (K.S.-C.); (A.A.); (T.J.); (A.M.)
| | - Łukasz Gierz
- Institute of Machine Design, Faculty of Mechanical Engineering, Poznan University of Technology, Piotrowo 3, PL-60965 Poznan, Poland
| | - Agnieszka Marcinkowska
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (K.S.-C.); (A.A.); (T.J.); (A.M.)
| | - Mariola Robakowska
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (K.S.-C.); (A.A.); (T.J.); (A.M.)
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3
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Wang D, Huang L, Fang H, Li S, Wang G, Zhou S, Zhao R, Sun X. Activated carbon fibers functionalized with superhydrophilic coated pDA/TiO 2/SiO 2 with photoluminescent self-cleaning properties for efficient oil-water separation. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133373. [PMID: 38159520 DOI: 10.1016/j.jhazmat.2023.133373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/14/2023] [Accepted: 12/23/2023] [Indexed: 01/03/2024]
Abstract
The adhesion of high-viscosity oil contamination poses limitations on three-dimensional (3D) materials' practical use in treating oilfield-produced water (OPW). In this study, we developed a hybrid pDA/TiO2/SiO2 coating (PTS) on the surface of hydrophilic activated carbon (ACF1) through a combination of dopamine (DA) polymerization, ethyl orthosilicate (TEOS) hydrolysis, and the condensation of TiO2 nanoparticles (NPs) with SiO2 NPs. This coating was designed for gravity-based oil-water separation. The inherent porosity and generous pore size of ACF1-PTS conferred it an ultra-high permeation flux (pure water flux of 3.72 × 105 L∙m-2∙h-1), allowing it to effectively separate simulated oil-water mixtures and oil-water emulsions while maintaining exceptional permeation flux and oil rejection efficiency. When compared to cleaning methods involving ethanol aqueous solutions and NaClO, ultraviolet (UV) illumination cleaning proved superior, enabling oil-contaminated ACF1-PTS to exhibit remarkable flux recovery efficiency and oil-removal capabilities during cyclic separation of actual OPW. Furthermore, the ACF1-PTS material demonstrated impressive stability and durability when exposed to acidic environments (acid, alkali, and salt), robust hydraulic washout conditions, and 25-cycle tests. This study offers valuable insights and research avenues for the development of highly efficient and environmentally friendly 3D oil-water separation materials for the actual treatment of OPW.
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Affiliation(s)
- Dongdong Wang
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Likun Huang
- School of Food Engineering, Harbin University of Commerce, Harbin 150076, China.
| | - Hanxiao Fang
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Shaofang Li
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Guangzhi Wang
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China.
| | - Simin Zhou
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Rui Zhao
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Xiyu Sun
- School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
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4
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Ashar A, Qayyum A, Bhatti IA, Aziz H, Bhutta ZA, Abdel-Maksoud MA, Saleem MH, Eletmany MR. Photo-Induced Super-Hydrophilicity of Nano-Calcite @ Polyester Fabric: Enhanced Solar Photocatalytic Activity against Imidacloprid. ACS OMEGA 2023; 8:35722-35737. [PMID: 37810732 PMCID: PMC10552504 DOI: 10.1021/acsomega.3c02987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 08/29/2023] [Indexed: 10/10/2023]
Abstract
The present study is pertinent to photo-induced, hydrophilic, nano-calcite grown onto the mercerized surface of polyester fabric (PF), treated with UV (10-50 min) and visible light (1-5 h) in addition to its photocatalytic application. The wicking method has been employed to select the most hydrophilic sample of fabric upon irradiation. The micrographs obtained by scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy indicated the erosions occurring at the surface of nano-calcite after UV light irradiation, maintaining the crystallinity of the photocatalyst. The surface charge has been measured for as-fabricated and irradiated nano-calcite @ PF for the development of high negative zeta potential after UV light irradiation (-24.6 mV). The irradiated nano-calcite @ PF exhibited a significant change in its contact angle, and the wetting property was enhanced to a considerable extent on UV (55.32°) and visible light irradiation (79.00°) in comparison to as-fabricated nano-calcite @ PF (137.54°). The irradiated samples of nano-calcite @ PF delineated the redshift in harvesting of solar spectrum, as revealed by diffuse reflectance spectroscopy comparative spectra. Additionally, the band gap of untreated nano-calcite was found to be 3.5 eV, while UV- and visible light-irradiated PF showed a reduction in band gap up to 2.95 and 3.15 eV upon UV and visible light irradiation. The photocatalytic efficiency of mesoporous nano-calcite was evaluated by photocatalytic degradation of imidacloprid as the probe pollutant. Higher solar photocatalytic degradation of imidacloprid (94.15%) was attained by UV light-irradiated nano-calcite @ PF. The time-resolved photoluminescence study has verified the high photocatalytic activity of UV light-irradiated nano-calcite @ PF for the generation of high concentration of hydroxyl radicals. The highly efficient reusability of a nano-calcite-based solar photocatalytic reactor has been observed for 10 cycles of treatment of imidacloprid bearing wastewater. The enhanced photocatalytic activity of UV light-exposed (20 min), superhydrophilic, nano-calcite @ PF for mineralization of pollutants suggests it to be an efficient solar photocatalyst for environmental applications.
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Affiliation(s)
- Ambreen Ashar
- TECS
Department, Wilson College of Textiles, NC State University, Raleigh, North Carolina 27606, United States
| | - Ayesha Qayyum
- Department
of Chemical Engineering (BK21 FOUR Graduate Program), Dong-A University, Busan 49315, Republic
of Korea
| | - Ijaz Ahmad Bhatti
- Department
of Chemistry, University of Agriculture
Faisalabad (UAF), Faisalabad 38040, Pakistan
| | - Humera Aziz
- Department
of Agricultural Sciences, College of Agriculture and Environmental
Sciences, Government College University, Faisalabad 38040, Pakistan
- Department
of Environmental Science, College of Agriculture and Environmental
Sciences, Government College University, Faisalabad 38040, Pakistan
| | - Zeeshan Ahmad Bhutta
- Laboratory
of Veterinary Immunology and Biochemistry, College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Mostafa A. Abdel-Maksoud
- Botany and
Microbiology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Muhammad Hamzah Saleem
- College
of Plant Science and Technology, Huazhong
Agricultural University, Wuhan 430070, China
| | - Mohamed R. Eletmany
- TECS
Department, Wilson College of Textiles, NC State University, Raleigh, North Carolina 27606, United States
- Chemistry
Department, Faculty of Science, South Valley
University, Qena 83523, Egypt
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5
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Chinnabathini VC, Dingenen F, Borah R, Abbas I, van der Tol J, Zarkua Z, D'Acapito F, Nguyen THT, Lievens P, Grandjean D, Verbruggen SW, Janssens E. Gas phase deposition of well-defined bimetallic gold-silver clusters for photocatalytic applications. NANOSCALE 2023; 15:6696-6708. [PMID: 36938628 DOI: 10.1039/d2nr07287d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Cluster beam deposition is employed for fabricating well-defined bimetallic plasmonic photocatalysts to enhance their activity while facilitating a more fundamental understanding of their properties. AuxAg1-x clusters with compositions (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spanning the metals' miscibility range were produced in the gas-phase and soft-landed on TiO2 P25-coated silicon wafers with an optimal coverage of 4 atomic monolayer equivalents. Electron microscopy images show that at this coverage most clusters remain well dispersed whereas EXAFS data are in agreement with the finding that the deposited clusters have an average size of ca. 5 nm and feature the same composition as the ablated alloy targets. A composition-dependant electron transfer from Au to Ag that is likely to impart chemical stability to the bimetallic clusters and protect Ag atoms against oxidation is additionally evidenced by XPS and XANES. Under simulated solar light, AuxAg1-x clusters show a remarkable composition-dependent volcano-type enhancement of their photocatalytic activity towards degradation of stearic acid, a model compound for organic fouling on surfaces. The Formal Quantum Efficiency (FQE) is peaking at the Au0.3Ag0.7 composition with a value that is twice as high as that of the pristine TiO2 P25 under solar simulator. Under UV the FQE of all compositions remains similar to that of pristine TiO2. A classical electromagnetic simulation study confirms that among all compositions Au0.3Ag0.7 features the largest near-field enhancement in the wavelength range of maximal solar light intensity, as well as sufficient individual photon energy resulting in a better photocatalytic self-cleaning activity. This allows ascribing the mechanism for photocatalysis mostly to the plasmonic effect of the bimetallic clusters through direct electron injection and near-field enhancement from the resonant cluster towards the conduction band of TiO2. These results not only demonstrate the added value of using well-defined bimetallic nanocatalysts to enhance their photocatalytic activity but also highlights the potential of the cluster beam deposition to design tailored noble metal modified photocatalytic surfaces with controlled compositions and sizes without involving potentially hazardous chemical agents.
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Affiliation(s)
- Vana Chinnappa Chinnabathini
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Fons Dingenen
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Rituraj Borah
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Imran Abbas
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Johan van der Tol
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Zviadi Zarkua
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | | | - Thi Hong Trang Nguyen
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Peter Lievens
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Didier Grandjean
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Sammy W Verbruggen
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Ewald Janssens
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
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6
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Smart Multiple Wetting Control on ZnO Coated Shape Memory Polymer Arrays. Chem Res Chin Univ 2022. [DOI: 10.1007/s40242-022-2265-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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7
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Dai X, Guo Z, Liu W. Ultraviolet-Driven Janus Foams with Wetting Gradients: Unidirectional Penetration Control for Underwater Bubbles. ACS APPLIED MATERIALS & INTERFACES 2022; 14:42734-42743. [PMID: 36070967 DOI: 10.1021/acsami.2c12766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the behavior of underwater bubbles and enabling their effective manipulation is important for bubble capture, collection, and transport. Here, to discuss the underwater permeation behavior of bubbles and critical influencing parameters in this process, the copper foams with tunable wettability were fabricated by utilizing the light-stimulated wettability response of TiO2. The Janus copper foams had different wettability gradients from superhydrophobic/hydrophobic to superhydrophobic/hydrophilic after UV irradiation at different times, and the bubbles on the surfaces showed distinctly diverse penetration behaviors. In particular, the constructed superhydrophobic/hydrophilic surfaces showed more difficult to achieve bubble penetration than the fully superhydrophobic, superhydrophobic/hydrophobic surface. It was found that the wetting states of the foams exposed to different irradiation times underwater plays a crucial role in the bubble penetration behavior. In other words, the difficulty of bubble penetration depends on the difficulty of bubble transition from gas-liquid contact to gas-solid contact. This facile and low-cost fabrication approach for Janus foams provided a valuable approach to understand the penetration behaviors of underwater bubbles, which is significant for expanding potential applications in bubble capture, bubble transport, and control of unstable gas reactions in underwater conditions.
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Affiliation(s)
- Xin Dai
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
| | - Zhiguang Guo
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, People's Republic of China
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Weimin Liu
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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8
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Preparation of PHEMA/TiO2 nanocomposites by combination of in-situ polymerization/hydrothermal method and determination of their thermal, swelling, biological and dielectric properties. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03146-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Transition metal co-doped TiO2 nanotubes decorated with Pt nanoparticles on optical fibers as an efficient photocatalyst for the decomposition of hazardous gaseous pollutants. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128786] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Superlyophilic Interfaces Assisted Thermal Management. Chem Res Chin Univ 2022. [DOI: 10.1007/s40242-022-2063-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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11
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Das R, Lindström T, Sharma PR, Chi K, Hsiao BS. Nanocellulose for Sustainable Water Purification. Chem Rev 2022; 122:8936-9031. [PMID: 35330990 DOI: 10.1021/acs.chemrev.1c00683] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanocelluloses (NC) are nature-based sustainable biomaterials, which not only possess cellulosic properties but also have the important hallmarks of nanomaterials, such as large surface area, versatile reactive sites or functionalities, and scaffolding stability to host inorganic nanoparticles. This class of nanomaterials offers new opportunities for a broad spectrum of applications for clean water production that were once thought impractical. This Review covers substantial discussions based on evaluative judgments of the recent literature and technical advancements in the fields of coagulation/flocculation, adsorption, photocatalysis, and membrane filtration for water decontamination through proper understanding of fundamental knowledge of NC, such as purity, crystallinity, surface chemistry and charge, suspension rheology, morphology, mechanical properties, and film stability. To supplement these, discussions on low-cost and scalable NC extraction, new characterizations including solution small-angle X-ray scattering evaluation, and structure-property relationships of NC are also reviewed. Identifying knowledge gaps and drawing perspectives could generate guidance to overcome uncertainties associated with the adaptation of NC-enabled water purification technologies. Furthermore, the topics of simultaneous removal of multipollutants disposal and proper handling of post/spent NC are discussed. We believe NC-enabled remediation nanomaterials can be integrated into a broad range of water treatments, greatly improving the cost-effectiveness and sustainability of water purification.
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Affiliation(s)
- Rasel Das
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Tom Lindström
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States.,KTH Royal Institute of Technology, Stockholm 100 44, Sweden
| | - Priyanka R Sharma
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Kai Chi
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Benjamin S Hsiao
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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12
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Yu X, Lai H, Kang H, Liu Y, Wang Y, Cheng Z. Underoil Directional Self-Transportation of Water Droplets on a TiO 2-Coated Conical Spine. ACS APPLIED MATERIALS & INTERFACES 2022; 14:6274-6282. [PMID: 35075896 DOI: 10.1021/acsami.1c24815] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Directional self-transportation of tiny droplets is significant in many fields. However, almost all existing studies focus on the phenomenon in air, and to realize similar performance in complex environments, such as oil, is still extremely rare. Here, we report a TiO2-coated conical spine (TCS) and demonstrate underoil directional self-transportation of water droplets on its surface. It is found that high surface hydrophilicity resulting from UV irradiation is necessary to achieve the self-transportation of water in oil. The critical water contact angle in oil is about 57°, and the maximal transport velocity can reach 1.4 mm/s. Mechanism analysis reveals that the excellent self-transportation property is ascribed to the combined effect between the Laplace force (FL) caused by the conical gradient structure and the hysteresis reduction resulting from the high hydrophilicity. Moreover, based on the special underoil self-transportation performance, a droplet-based microreaction and demulsification of water-in-oil emulsions were demonstrated using the TCS. This work reports the self-transportation of water in oil, which could provide some fresh ideas for designing new superwetting self-transportation materials.
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Affiliation(s)
- Xiaoyan Yu
- State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
| | - Hua Lai
- State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
| | - Hongjun Kang
- State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
| | - Yuyan Liu
- State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
| | - Youshan Wang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Zhongjun Cheng
- State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
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13
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Verma M, Rana A, Vidyasagar KEC, Kalyansundaram D, Saha S. Protein Patterning on Microtextured Polymeric Nano-brush Templates Obtained By Nanosecond Fibre Laser. Macromol Biosci 2022; 22:e2100454. [PMID: 35102705 DOI: 10.1002/mabi.202100454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/28/2022] [Indexed: 11/11/2022]
Abstract
Micropatterned polymer brushes have attracted attention in several biomedical areas, i.e., tissue engineering, protein microarray, biosensors etc., for precise arrangement of biomolecules. Herein, we report a facile and scalable approach to create microtextured polymer brushes with the ability to generate different type of protein patterns. Nanosecond fibre laser was exploited to generate micropatterns on polyPEGMA (poly(ethylene glycol) methacrylate) brush modified Ti alloy substrate. Surface initiated atom transfer radical polymerisation was employed to grow PolyPEGMA brush (11-87 nm thick) on Ti alloy surface immobilized with initiator having an initiator density (σ*) of 1.5 initiators/nm2 . Polymer brushes were then selectively laser ablated and their presence on non-textured area was confirmed by atomic force microscopy, fluorescence microscopy and X-ray photoelectron spectroscopy. Spatial orientation of biomolecules was first achieved by non-specific protein adsorption on areas ablated by the laser, via physisorption. Further, patterned brushes of polyPEGMA were modified to activated ester that gave rise to protein conjugation specifically on non-laser ablated brush areas. Moreover, the laser ablated brush modified patterned template was also successfully utilized for generating alternate patterns of bacteria. This promising technique can be further extended to create interesting patterns of several biomolecules which are of great interest to biomedical research community. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Meenakshi Verma
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Delhi, India
| | - Abhishek Rana
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, Delhi, India
| | - K E Ch Vidyasagar
- Centre for Biomedical Engineering, Indian Institute of Technology Delhi, Delhi, India
| | - Dinesh Kalyansundaram
- Centre for Biomedical Engineering, Indian Institute of Technology Delhi, Delhi, India
| | - Sampa Saha
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Delhi, India
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Prewetting Induced Hydrophilicity to Augment Photocatalytic Activity of Nanocalcite @ Polyester Fabric. Polymers (Basel) 2022; 14:polym14020295. [PMID: 35054700 PMCID: PMC8777986 DOI: 10.3390/polym14020295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 01/01/2022] [Accepted: 01/06/2022] [Indexed: 11/29/2022] Open
Abstract
To eliminate imidacloprid insecticide from wastewater, nanocalcite was grafted onto the surface of pretreated polyester fabric. The process of seeding was followed by the low temperature hydrothermal method for the growth of nanocalcite for the functionalization of fabric. The goal of this study was to improve the hydrophilicity of the nanocalcite photocatalyst that had been grafted onto the surface of polyester fabric (PF) using acidic and basic prewetting techniques. The morphological characteristics, crystalline nature, surface charge density, functional groups of surface-modified nanocalcite @ PF were determined via SEM, XRD, FTIR, and Zeta potential (ZP), respectively. Characterization results critically disclosed surface roughness due to excessive induction of hydroxyl groups, rhombohedral crystal structure, and high charge density (0.721 mS/cm). Moreover, contact angle of nanocalcite @ PF was calculated to be 137.54° while after acidic and basic prewetting, it was reduced to 87.17° and 48.19°. Similarly, bandgap of the as fabricated nanocalcite was found to be 3.5 eV, while basic prewetted PF showed a reduction in band gap (2.9 eV). The solar photocatalytic mineralization of imidacloprid as a probe pollutant was used to assess the improvement in photocatalytic activity of nanocalcite @ PF after prewetting. Response surface methodology was used to statistically optimize the solar exposure time, concentration of the oxidant, and initial pH of the reaction mixture. Maximum solar photocatalytic degradation of the imidacloprid was achieved by basic prewetted nanocalcite @ PF (up to 91.49%), which was superior to acidic prewetted fabric and as-fabricated nanocalcite @ PF. Furthermore, HPLC and FTIR findings further indicated that imidacloprid was decomposed vastly to harmless species by basic prewetted nanocalcite @ PF.
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15
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Gan Q, Liu H, Zhang S, Wang F, Cheng J, Wang X, Dong S, Tao Q, Chen Y, Zhu P. Robust Hydrophobic Materials by Surface Modification in Transition-Metal Diborides. ACS APPLIED MATERIALS & INTERFACES 2021; 13:58162-58169. [PMID: 34809421 DOI: 10.1021/acsami.1c17631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Exploring the hydrophobicity of robust conductors is significant for electronic devices to simultaneously be used in a wet environment and extreme conditions. However, a combination of conductivity, strong mechanical properties, and hydrophobicity in one material is hindered by the inherent features of the materials. A new kind of robust hydrophobic conductor is designed in transition-metal diborides (TMdBs: TiB2, ZrB2, and HfB2) to break through this challenge. The results calculated by density functional theory indicate that high hardness comes from high shear and bulk modulus, which is consistent with experimental results (TiB2, 25.0 GPa; ZrB2, 17.5 GPa; HfB2, 21.5 GPa). The theoretical calculated results reveal that edge sides have a lower surface energy than basal plane (001) in TMdBs. Hence, the edge sides are exposed with a needle-like morphology in TMdBs. Moreover, needle-like surfaces exhibiting hydrophobicity have water contact angles of 132.0° (TiB2), 116.8° (ZrB2), and 114.0° (HfB2). The hydrophobicity arises from a lower surface free energy of edge sides in TMdBs and a rough surface that reduces the contact area of water and a solid. This work develops a new kind of robust functional material in TMdBs.
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Affiliation(s)
- Quan Gan
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Hetian Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Shuai Zhang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Fei Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Jiaen Cheng
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Xin Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Shushan Dong
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Qiang Tao
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Yanli Chen
- Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China
| | - Pinwen Zhu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China
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16
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Etim UJ, Bai P, Gazit OM, Zhong Z. Low-Temperature Heterogeneous Oxidation Catalysis and Molecular Oxygen Activation. CATALYSIS REVIEWS 2021. [DOI: 10.1080/01614940.2021.1919044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ubong J. Etim
- Department of Chemical Engineering, Guangdong Technion-Israel Institute of Technology (GTIIT), Shantou, Guangdong, China
| | - Peng Bai
- College of Chemical Engineering, China University of Petroleum, Qingdao, China
| | - Oz M. Gazit
- Wolfson Faculty of Chemical Engineering, Technion – Israel Institute of Technology, Haifa, Israel
| | - Ziyi Zhong
- Department of Chemical Engineering, Guangdong Technion-Israel Institute of Technology (GTIIT), Shantou, Guangdong, China
- Technion Israel Institute of Technology (IIT), Haifa, Israel
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17
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Ping Z, Sun Q, Yi J, Li Q, Zhao L, Zhang H, Huang F, Li S, Cheng L. Formulating Multiphase Medium Anti-wetting States in an Air-Water-Oil System: Engineering Defects for Interface Chemical Evolutions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:49556-49566. [PMID: 34636235 DOI: 10.1021/acsami.1c15823] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Studies which regulate macroscopic wetting states on determined surfaces in multiphase media are of far-reaching significance but are still in the preliminary stage. Herein, inspired by the wettability subassembly of fish scales, Namib desert beetle shell, and lotus leaf upper side, interfaces in the air-water-oil system are programmed by defect engineering to tailor the anti-wetting evolution from double to triple liquid repellency states. By controlling the visible light irradiation and plasma treatment, surface oxygen vacancies on CuxO@TiO2 nanowires (NWs) can be healed or reconstructed. The original membrane or the membrane after plasma treatment possesses abundant surface oxygen vacancies, and the homogeneous hydrophilic membrane shows only double anti-wetting states in the water-oil system. By the unsaturated visible light irradiation time, the surface oxygen vacancy partially healed, the heterogeneous hydrophilic-hydrophobic components occupied the membrane surface, and the anti-wetting state finally changed from double to triple in the air-water-oil system. After the illumination time reaches saturation, it promotes the healing of all surface oxygen vacancies, and the membrane surface only contains uniform hydrophobic components and only maintains double anti-wetting state in the air-oil system. The mechanism of the triple anti-wetting state on a heterogeneous surface is expounded by establishing a wetting model. The wetting state and the adhesion state of the CuxO@TiO2 NW membrane show regional specificity by controlling the illumination time and region. The underwater oil droplets exhibit the "non-adhesive" and "adhesive" state in a region with unsaturated irradiation time or in an unirradiated region, respectively. Underwater oil droplet manipulation can be accomplished easily based on switchable wettability and adhesion. Current studies reveal that defect engineering can be extended to anti-wetting evolution in the air-water-oil system. Constructing an anti-wetting interface by heterogeneous components provides reference for designing the novel anti-wetting interface.
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Affiliation(s)
- Zhongxin Ping
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Qingyun Sun
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Jiuqi Yi
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Qianqian Li
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Lukang Zhao
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Hui Zhang
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Fangzhi Huang
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Shikuo Li
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Longjiu Cheng
- Laboratory of Clean Energy & Environmental Catalysis, AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
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18
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Balmuri SR, Keck NC, Niepa TH. Assessing the performance of wax-based microsorbents for oil remediation. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Deng Y, Wu Q, Li Z, Huang X, Rao S, Liang Y, Lu H. Crystal face dependent wettability of α-quartz: Elucidation by time-of-flight secondary ion mass spectrometry techniques combined with molecular dynamics. J Colloid Interface Sci 2021; 607:1699-1708. [PMID: 34592555 DOI: 10.1016/j.jcis.2021.09.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/26/2021] [Accepted: 09/08/2021] [Indexed: 11/30/2022]
Abstract
HYPOTHESIS Quartz is one of the most common but important minerals, and its wettability plays a significant role in affecting various natural and industrial processes. Studies have revealed that different crystal faces of quartz are with different wettabilities, but its mechanism is still vague. EXPERIMENTS AND SIMULATIONS For specifying the mechanism of crystal face dependent wettability, the contact angles of three different liquids on the crystal faces of α-quartz are measured; the time-of-flight secondary ion mass spectrometry (ToF-SIMS) is employed to establish the crystal surface models; molecular dynamics (MD) simulations with the surface models are performed to understand the wetting behavior at molecular scale. FINDINGS Based on the contact angle measurements, the wettabilities of different crystal faces of α-quartz are found different, which can be directly attributed to the concentration of hydroxyl group on crystal faces based on ToF-SIMS results. MD simulations yield consistent results with the contact angle order recognized from experiments, revealing that the surface hydroxyl group controls the wettability of α-quartz crystal faces. It is also recognized that the pristine surface atomic arrangement, especially the surface concentration of unsaturated bond (an intrinsic property of α-quartz), is the intrinsic cause of the difference in the concentration of hydroxyl group of the crystal surface.
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Affiliation(s)
- Yajun Deng
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; College of Engineering, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China.
| | - Qianhong Wu
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; School of Physics, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China.
| | - Zhenchao Li
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; School of Earth and Space Sciences, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China.
| | - Xin Huang
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; College of Engineering, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China.
| | - Shihang Rao
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; College of Engineering, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China.
| | - Yunfeng Liang
- Department of Systems Innovation, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Hailong Lu
- Beijing International Center for Gas Hydrate, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China; School of Earth and Space Sciences, Peking University, No.5 Yiheyuan Road Haidian District, Beijing 100871, China.
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20
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Li D, Li L, Zhao M, Yang J, Wang Y, Xu X, Ge S, Fa W, Zheng Z. Exploring the activation pathway of photo-induced electrons in facets-dependent I -doped BiOCl nanosheets for PCPNa degradation. NANOTECHNOLOGY 2021; 32:495707. [PMID: 34450603 DOI: 10.1088/1361-6528/ac21f3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 08/27/2021] [Indexed: 06/13/2023]
Abstract
Electrons can degrade pentachlorphenate sodium (PCPNa) directly or activate molecular oxygen to produce·O2-and ·OH for its degradation. However, less work has been performed to control such two kinds of reaction pathway by modifying BiOCl. Herein, we firstly regulated the reaction pathway between electrons and PCPNa by adjusting the amount of surface oxygen vacancies (OVs) and surface adsorbed hydroxyl groups in I-doped BiOCl exposed with different facets. OVs on (001) facets-exposed I-doped BiOCl enabled large amount of PCPNa to adsorb on its surface and facilitated the direct reaction between electrons and PCPNa. In contrary, more surface adsorbed hydroxyl groups and oxygen on (010) facets-exposed I-doped BiOCl can retard the direct reaction between electrons and PCPNa via lowering the adsorption of PCPNa and increasing the activation of molecular oxygen by electrons. Although more·O2-and ·OH generated in I-doped (010)-facets exposed BiOCl, I-doped (001)-facets exposed BiOCl exhibited better photocatalytic activity. We proposed that the direct reaction between electrons and PCPNa can enhance the utilization efficiency of photogenerated electrons and improve photocatalytic degradation efficiency of PCPNa.
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Affiliation(s)
- Dapeng Li
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Luqi Li
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Mingyue Zhao
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Jingming Yang
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Yafei Wang
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Xuefeng Xu
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Suxiang Ge
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Wenjun Fa
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
| | - Zhi Zheng
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan 461000, People's Republic of China
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21
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Bao SY, Li DZ, Gong XQ. Photo-induced hydrophilicity at the ZnO(112̄0) surface: an evolutionary algorithm-aided density functional theory study. Phys Chem Chem Phys 2021; 23:19790-19794. [PMID: 34525139 DOI: 10.1039/d1cp02542b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Evolutionary algorithm-aided density functional theory calculations were utilized to determine the stable adsorption structures of H2O at ZnO(112̄0) extensively under different coverages. By decomposing the adsorption energetics, we illustrate that H2O dissociation to a large extent is actually hampered by the barrier for induced distortion of the ZnO surface, and once the surface becomes less difficult to be distorted it will exhibit higher hydrophilicity or even superhydrophilicity. Specifically, photo-stimulation modelling suggests that the surface Zn-O bonds can be weakened by photo-excitation, and the layer of fully dissociated H2O can be then facilitated to form. Accordingly, a novel mechanism for photo-induced superhydrophilicity is proposed.
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Affiliation(s)
- Shen-Yuan Bao
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.
| | - Dong-Zhi Li
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.
| | - Xue-Qing Gong
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China.
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22
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Hegyi A, Grebenişan E, Lăzărescu AV, Stoian V, Szilagyi H. Influence of TiO 2 Nanoparticles on the Resistance of Cementitious Composite Materials to the Action of Fungal Species. MATERIALS 2021; 14:ma14164442. [PMID: 34442965 PMCID: PMC8398090 DOI: 10.3390/ma14164442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 07/27/2021] [Accepted: 08/05/2021] [Indexed: 11/27/2022]
Abstract
The development of mold films on the cement surfaces of buildings is a health and safety problem for the population, aesthetic but also in terms of their durability. The use of specific performance of cementitious composites containing TiO2 nanoparticles, photoactivated by UV radiation, can be a viable solution to mitigate to eliminate these problems. The experimental studies presented aim to analyze the capacity to inhibit the development of mold type Aspergillus and Penicillium on the surface of composite materials with nano-TiO2 content and the identification of the optimal range of nanomaterial addition. The identification and analysis of the inhibition halo (zone with a biological load of maximum 1–10 colonies of microorganisms) confirmed the biocidal capacity of the cementitious composites, but also indicated the possibility that an excess of TiO2 nanoparticles in the mixture could induce a development of cell resistance, which would be unfavorable both in terms of behavior and in terms of cost.
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Affiliation(s)
- Andreea Hegyi
- NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Floreşti, 400524 Cluj-Napoca, Romania;
- Correspondence: (A.H.); (A.-V.L.); (V.S.); (H.S.)
| | - Elvira Grebenişan
- NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Floreşti, 400524 Cluj-Napoca, Romania;
- IOSUD-UTCN Doctoral School, Technical University of Cluj-Napoca, 15 Daicoviciu Street, 400020 Cluj-Napoca, Romania
| | - Adrian-Victor Lăzărescu
- NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Floreşti, 400524 Cluj-Napoca, Romania;
- IOSUD-UTCN Doctoral School, Technical University of Cluj-Napoca, 15 Daicoviciu Street, 400020 Cluj-Napoca, Romania
- Correspondence: (A.H.); (A.-V.L.); (V.S.); (H.S.)
| | - Vlad Stoian
- Department of Microbiology, Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 3-5 Calea Mănăştur, 400372 Cluj-Napoca, Romania
- Correspondence: (A.H.); (A.-V.L.); (V.S.); (H.S.)
| | - Henriette Szilagyi
- NIRD URBAN-INCERC Cluj-Napoca Branch, 117 Calea Floreşti, 400524 Cluj-Napoca, Romania;
- Correspondence: (A.H.); (A.-V.L.); (V.S.); (H.S.)
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Peiris S, Silva HB, Ranasinghe KN, Bandara SV, Perera IR. Recent development and future prospects of
TiO
2
photocatalysis. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202000465] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sasanka Peiris
- Australian Institute for Bioengineering and Nanotechnology University of Queensland St Lucia Queensland Australia
| | - Haritha B. Silva
- Department of Chemistry, Faculty of Science University of Peradeniya Peradeniya Sri Lanka
| | - Kumudu N. Ranasinghe
- Department of Chemistry, Faculty of Science University of Peradeniya Peradeniya Sri Lanka
| | - Sanjaya V. Bandara
- Department of Chemistry, Faculty of Science University of Peradeniya Peradeniya Sri Lanka
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Abstract
Titanium dioxide (TiO2) is widely used in various fields both in daily life and industry owing to its excellent photoelectric properties and its induced superwettability. Over the past several decades, various methods have been reported to improve the wettability of TiO2 and plenty of practical applications have been developed. The TiO2-derived materials with different morphologies display a variety of functions including photocatalysis, self-cleaning, oil-water separation, etc. Herein, various functions and applications of TiO2 with superwettability are summarized and described in different sections. First, a brief introduction about the discovery of photoelectrodes made of TiO2 is revealed. The ultra-fast spreading behaviors on TiO2 are shown in the part of ultra-fast spreading with superwettability. The part of controllable wettability introduces the controllable wettability of TiO2-derived materials and their related applications. Recent developments of interfacial photocatalysis and photoelectrochemical reactions with TiO2 are presented in the part of interfacial photocatalysis and photoelectrochemical reactions. The part of nanochannels for ion rectification describes ion transportation in nanochannels based on TiO2-derived materials. In the final section, a brief conclusion and a future outlook based on the superwettability of TiO2 are shown.
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25
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Suitability of Different Titanium Dioxide Nanotube Morphologies for Photocatalytic Water Treatment. NANOMATERIALS 2021; 11:nano11030708. [PMID: 33799849 PMCID: PMC7998466 DOI: 10.3390/nano11030708] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 03/03/2021] [Accepted: 03/08/2021] [Indexed: 11/20/2022]
Abstract
Photocatalysis has long been touted as one of the most promising technologies for environmental remediation. The ability of photocatalysts to degrade a host of different pollutants, especially recalcitrant molecules, is certainly appealing. Titanium dioxide (TiO2) has been used extensively for this purpose. Anodic oxidation allows for the synthesis of a highly ordered nanotubular structure with a high degree of tunability. In this study, a series of TiO2 arrays were synthesised using different electrolytes and different potentials. Mixed anatase-rutile photocatalysts with excellent wettability were achieved with all the experimental iterations. Under UVA light, all the materials showed significant photoactivity towards different organic pollutants. The nanotubes synthesised in the ethylene glycol-based electrolyte exhibited the best performance, with near complete degradation of all the pollutants. The antibacterial activity of this same material was similarly high, with extremely low bacterial survival rates. Increasing the voltage resulted in wider and longer nanotubes, characteristics which increase the level of photocatalytic activity. The ease of synthesis coupled with the excellent activity makes this a viable material that can be used in flat-plate reactors and that is suitable for photocatalytic water treatment.
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26
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Rudakova AV, Emeline AV. Photoinduced Hydrophilicity of Surfaces of Thin Films. COLLOID JOURNAL 2021. [DOI: 10.1134/s1061933x21010105] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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27
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Yang Y, Sun T, Ma F, Huang LF, Zeng Z. Superhydrophilic Fe 3+ Doped TiO 2 Films with Long-Lasting Antifogging Performance. ACS APPLIED MATERIALS & INTERFACES 2021; 13:3377-3386. [PMID: 33400484 DOI: 10.1021/acsami.0c18444] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Based on the superhydrophilicity of titanium dioxide (TiO2) after ultraviolet irradiation, it has a high potential in the application of antifogging. However, a durable superhydrophilic state and a broader photoresponse range are necessary. Considering the enhancement of the photoresponse of TiO2, doping is an effective method to prolong the superhydrophilic state. In this paper, a Fe3+ doped TiO2 film with long-lasting superhydrophilicity and antifogging is prepared by sol-gel method. The experiment and density-functional theory (DFT) calculations are performed to investigate the antifogging performance and the underlying microscopic mechanism of Fe3+ doped TiO2. Antifogging tests demonstrate that 1.0 mol % Fe3+ doping leads to durable antifogging performance which lasts 60 days. The DFT calculations reveal that the Fe3+ doping can both increase the photolysis ability of TiO2 under sunlight exposure and enhance the stability of the hydroxyl adsorbate on TiO2 surface, which are the main reasons for a long-lasting superhydrophilicity of TiO2 after sunlight exposure.
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Affiliation(s)
- Yi Yang
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Tianyu Sun
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Fuliang Ma
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
| | - Liang-Feng Huang
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
| | - Zhixiang Zeng
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
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28
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Sun Y, Guo Z. Programming Multiphase Media Superwetting States in the Oil-Water-Air System: Evolutions in Hydrophobic-Hydrophilic Surface Heterogeneous Chemistry. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2004875. [PMID: 33463790 DOI: 10.1002/adma.202004875] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/26/2020] [Indexed: 06/12/2023]
Abstract
Studies toward tailoring macroscopic extreme wetting behaviors on a certain well-defined surface in multiphase media are significant but still at an infant stage. Herein, superantiwetting evolutions in the oil-water-air system can be programmed from single to quadruple superrepellence by controlling the surface hydrophobic-hydrophilic heterogeneous chemistry. Ammonia vapor exposure makes the realization of challenging superhydrophilicity-superoleophobicity possible in air medium, causing the transition from quadruple to triple superantiwetting states in the oil-water-air system. Upon UV illumination, only single superrepellence-underwater superoleophobicity is maintained on titanium dioxide (TiO2, P25)-based coatings. A reversible transition between underoil superhydrophilicity and superhydrophobicity via an alternating UV irradiation and heating process leads to a switching between "water-absorbing" and "size-sieving" effects in water-in-oil emulsion separation. A comparative study for investigating two such effects in emulsion separation is further investigated. The current conceptual insights not only extend superwetting states to multiphase media, but can also deepen the understanding of the relationship between macroscopic extreme wetting behaviors and surface chemistry.
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Affiliation(s)
- Yihan Sun
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhiguang Guo
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062, P. R. China
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29
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Fardo FM, Ribeiro RS, Strauss JA, Nardi J, Ferreira LC, Schmökel G, Costa TMH, Pereira MB, Horowitz F. Double layer SiO 2-TiO 2 sol-gel thin films on glass for antireflection, antifogging, and UV recoverable self-cleaning. APPLIED OPTICS 2020; 59:7720-7725. [PMID: 32902474 DOI: 10.1364/ao.397484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
Double layer thin films, mechanically stable and adhering to glass, were produced through the sol-gel process, using tetraethyl orthosilicate and titanium butoxide as precursors. The refractive index of the titania and silica-titania composite layers were typically 2.1 and 1.7, and their physical thicknesses were approximately 65 nm and 81 nm, respectively, as determined by ellipsometry. These optical constants allowed attainment of quarter-wave optical thicknesses at the center of the visible spectrum (550 nm) as designed, with an increase of 3.4% in transmittance. The nanometric surface roughness, measured by optical profilometry, was effective to decrease light scattering and water contact angles to below 10°. As novelty in dip-coated sol-gel films, superhydrophilicity for self-cleaning, antifogging, and antireflection in the mid-visible spectrum were simultaneously attained with durability of 9 weeks in the dark. Further application of UV light allowed regeneration of contact angles for self-cleaning.
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30
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Ambroziak R, Krajczewski J, Pisarek M, Kudelski A. Immobilization of Cubic Silver Plasmonic Nanoparticles on TiO 2 Nanotubes, Reducing the Coffee Ring Effect in Surface-Enhanced Raman Spectroscopy Applications. ACS OMEGA 2020; 5:13963-13972. [PMID: 32566863 PMCID: PMC7301603 DOI: 10.1021/acsomega.0c01356] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 05/14/2020] [Indexed: 06/11/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) substrates prepared by immobilizing silver cubic nanoparticles (Ag CNPs) on titanium dioxide nanotubes (TiO2 NTs) were used for investigations of the "coffee ring" (CR) effect and its impact on spatial reproducibility of measured Raman signals in comparison with flat surfaces (Ti and Si) where the CR effect is usually significant. The immobilization of nanoparticles from drops, which is a very simple technique, usually does not permit a homogeneous distribution of deposited NPs because there is significant accumulation of the material at the boundary of the drying area. Our proposed SERS substrates effectively reduced the CR effect through the use of well-ordered nanostructures where a smaller number of Ag CNPs were transferred to the boundary region. It was not only the surface morphology that was important but also the physicochemical properties of TiO2 NTs, such as wettability. The wettability of the prepared samples was determined by measuring the static water contact angle (WCA), and the chemical composition near the boundary of the drying area was studied using Auger electron spectroscopy. The morphology of the substrates obtained was characterized using scanning electron microscopy. Our studies showed that reducing the coffee ring effect increased the spatial reproducibility of the measured SERS signal in the area of the deposited CNPs. Therefore, the platforms obtained may be very useful in commercial SERS applications.
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Affiliation(s)
- Robert Ambroziak
- Faculty
of Chemistry, University of Warsaw, Pasteur Str. 1, 02-093 Warsaw, Poland
| | - Jan Krajczewski
- Faculty
of Chemistry, University of Warsaw, Pasteur Str. 1, 02-093 Warsaw, Poland
| | - Marcin Pisarek
- Institute
of Physical Chemistry, Polish Academy of Sciences, Laboratory of Surface
Analysis, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
| | - Andrzej Kudelski
- Faculty
of Chemistry, University of Warsaw, Pasteur Str. 1, 02-093 Warsaw, Poland
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31
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Importance of interfacial and rheological properties in the suppression of uniform deposition to coffee ring pattern of zinc oxide nanofluids in the presence of anionic surfactants. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04646-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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32
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Ge S, Li D, Cui Z, Zhang Y, Zhang S, Zhang T, Jia G, He W, Zheng Z. Regulating the relative content of O2− and OH for PCPNa degradation on BiOCl plates with controllable exposed crystal faces and surface oxygen vacancies. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.115743] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Zhang W, Zhang D, Yan W, Luo W, Zhao C, Liu D. Optically Induced Rapid Wetting Transition on Zn-Polar and O-Polar Zinc Oxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14791-14796. [PMID: 31663342 DOI: 10.1021/acs.langmuir.9b02629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The design and fabrication of surfaces that support rapid wetting transition remain technologically challenging. Here, we examine the effects of optical illumination on the wetting behaviors of zinc oxide (ZnO) single crystals. We find that ultraviolet irradiation above the band gap energy promotes a rapid wetting transition, characterized by sliding of the water droplet, within a few seconds. Notably, the transition for Zn-polar (0001) ZnO surfaces is even faster than that for O-polar (0001̅) ZnO surfaces. We confirmed that process is dependent on power, surface polarity, and solution pH and reversible through illumination by near-infrared light, which restores the water contact angle back to its initial value. Surface chemical analysis revealed that the instantaneous photocatalytic formation of surface-terminated hydroxyl (-OH) groups is responsible for the observed rapid wetting transition. Density functional theory calculations with the inclusion of onsite Coulomb interactions revealed that both the Zn-polar and O-polar surfaces can be easily covered with -OH groups through the adsorption of -OH groups or hydrogen atoms, respectively. This study develops a route to fabricate optically active and controllable microfluidic devices that support rapid wetting transitions for water droplet manipulation.
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Affiliation(s)
- Wangyang Zhang
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
| | - Dongdong Zhang
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
| | - Weishan Yan
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
| | - Wenyao Luo
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
| | - Chaopeng Zhao
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
| | - Duo Liu
- State Key Laboratory of Crystal Materials , Shandong University , 27 South Shanda Road , Jinan , Shandong 250100 , P. R. China
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34
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Glass D, Cortés E, Ben‐Jaber S, Brick T, Peveler WJ, Blackman CS, Howle CR, Quesada‐Cabrera R, Parkin IP, Maier SA. Dynamics of Photo-Induced Surface Oxygen Vacancies in Metal-Oxide Semiconductors Studied Under Ambient Conditions. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1901841. [PMID: 31763155 PMCID: PMC6864511 DOI: 10.1002/advs.201901841] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 09/05/2019] [Indexed: 05/23/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique commonly used in the detection of traces of organic molecules. The mechanism of SERS is of a dual nature, with Raman scattering enhancements due to a combination of electromagnetic (EM) and chemical contributions. In conventional SERS, the EM component is largely responsible for the enhancement, with the chemical contribution playing a less significant role. An alternative technique, called photo-induced enhanced Raman spectroscopy (PIERS) has been recently developed, using a photo-activated semiconductor substrate to give additional chemical enhancement of Raman bands over traditional SERS. This enhancement is assigned to surface oxygen vacancies (V o) formed upon pre-irradiation of the substrate. In this work, the exceptional chemical contribution in PIERS allows for the evaluation of atomic V o dynamics in metal oxide surfaces. This technique is applied to study the formation and healing rates of surface-active V o in archetypical metal-oxide semiconductors, namely, TiO2, WO3, and ZnO. Contrary to conventional analytical tools, PIERS provides intuitive and valuable information about surface stability of atomic defects at ambient pressure and under operando conditions, which has important implications in a wide range of applications including catalysis and energy storage materials.
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Affiliation(s)
- Daniel Glass
- The Blackett LaboratoryDepartment of PhysicsImperial College LondonLondonSW7 2AZUK
- Department of ChemistryUniversity College London20 Gordon StLondonWC1H 0AJUK
| | - Emiliano Cortés
- The Blackett LaboratoryDepartment of PhysicsImperial College LondonLondonSW7 2AZUK
- Chair in Hybrid NanosystemsNanoinsitute MunichFaculty of PhysicsLudwig Maximilians Universität München80539MünchenGermany
| | - Sultan Ben‐Jaber
- Department of ChemistryUniversity College London20 Gordon StLondonWC1H 0AJUK
- Department of Forensics ScienceKing Fahad Security CollageRiyadh11461Saudi Arabia
| | - Thomas Brick
- The Blackett LaboratoryDepartment of PhysicsImperial College LondonLondonSW7 2AZUK
| | - William J. Peveler
- Department of ChemistryUniversity College London20 Gordon StLondonWC1H 0AJUK
- School of ChemistryJoseph Black BuildingUniversity of GlasgowGlasgowG12 8QQUK
| | | | | | | | - Ivan P. Parkin
- Department of ChemistryUniversity College London20 Gordon StLondonWC1H 0AJUK
| | - Stefan A. Maier
- The Blackett LaboratoryDepartment of PhysicsImperial College LondonLondonSW7 2AZUK
- Chair in Hybrid NanosystemsNanoinsitute MunichFaculty of PhysicsLudwig Maximilians Universität München80539MünchenGermany
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35
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Hu L, Song X, Shan X, Zhao X, Guo F, Xiao P. Visible Light-Activated Self-Recovery Hydrophobic CeO 2/Black TiO 2 Coating Prepared Using Air Plasma Spraying. ACS APPLIED MATERIALS & INTERFACES 2019; 11:37209-37215. [PMID: 31535840 DOI: 10.1021/acsami.9b10675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hydrophobic coatings are widely used in many areas from home to industry. However, the hydrophobicity can be easily degraded by adsorption of the atmospheric contaminations. In this study, a novel CeO2/black TiO2 hydrophobic coating with self-recovery capability is prepared using air plasma spraying without any chemical modification. The water contact angles (WCAs) of the coatings decreased after oleic acid contamination. Because of the presence of black TiO2, the composite coating has the photodegradation property under irradiation of visible light, and the part of the black TiO2 transforms to be superhydrophilic after irradiation for the generation of the surface oxygen vacancies. The oleic acid was decomposed and the WCAs changed depending on the volume percentage of the CeO2. The coating exhibits hydrophilicity when the volume percentage of the CeO2 is less than 60%, and hydrophobic when higher. After storage in a dark and clean environment, all the coatings can recover their hydrophobicity for the black TiO2 that returned back to its origin state. It is believed that this hydrophobic self-cleaning ceramic coating should have potential in engineering applications.
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Affiliation(s)
- Lingyue Hu
- Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Xuefeng Song
- Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Xiao Shan
- Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Xiaofeng Zhao
- Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Fangwei Guo
- Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Ping Xiao
- School of Materials , University of Manchester , MSS Tower , Manchester M13 9PL , U.K
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36
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Real-time Observation of Interface Atomic Structures by an Energy-Dispersive Surface X-ray Diffraction. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2019. [DOI: 10.1380/ejssnt.2019.155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Wu Q, Cheng Y, Huang F, Li X, Cui X, Xu J, Wang Y. In-situ creating elastic lattice OO bonds over semicrystalline yellow TiO 2 nanoparticles for significantly enhanced photocatalytic H 2 production. JOURNAL OF HAZARDOUS MATERIALS 2019; 374:287-295. [PMID: 31009893 DOI: 10.1016/j.jhazmat.2019.04.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 04/08/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
Atomic defects (e.g., Ti3+, oxygen vacancies) have been intenstively investigated for modifying TiO2 in order to reach visible light active photocatalytic H2 production. However, the atomic defects within TiO2 could easily act as photo-generated charge-carrier recombination centers, resulting in relatively low H2 conversion efficiency. In this paper, semicrystalline yellow TiO2 nanoparticles rich of superoxide ions are new synthesized by a simple aqueous solution method. Instead of introducing atomic defects, we show for the first time that catalytic performance can also be significantly improved via in-situ creating lattice OO bonds within metastable semicrystalline TiO2. The synthesized semicrystalline yellow TiO2 exhibits significantly enhanced photocatalytic activity for H2 production after cycle tests. The formaldehyde in aqueous solution is used as target pollutant to simulate industrial wastewater. In-situ created elastic lattice OO bonds are proposed to improve catalytic performance through facilitating the breakage of CH bonds of HCHO. A series of internally consistent reaction equations is proposed that describes the role of in-situ created lattice OO bonds for improving the catalytic performance. This is strongly supported by that the H2 production rate at the end of the fourth cycle test is significantly more than that of the beginning of the first cycle test.
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Affiliation(s)
- Qingping Wu
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Yao Cheng
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
| | - Feng Huang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Xiao Li
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Xiangshui Cui
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Ju Xu
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China
| | - Yuansheng Wang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
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38
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Fu H, Yang L, Wang Y, Yang C, Tian W, Jiang W. Preparation of AgCl Particles with Different Superwettabilities by Particle Size Regulation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7944-7953. [PMID: 31120253 DOI: 10.1021/acs.langmuir.9b00809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, a simple ammonia evaporation process to obtain AgCl powder with arbitrary superwettability, without introducing any low-surface-free-energy modifier, was investigated. By controlling the recrystallization parameters of the ammonia evaporation process, AgCl crystals precipitated from AgCl-ammonia solution show different wettabilities ranging from superhydrophilicity, via hydrophilicity and hydrophobicity, to superhydrophobicity, with the same chemical composition and structure. Characterization of the obtained AgCl samples with different wettabilities confirms the decisive effect of particle size although light irradiation also causes their wettability transformation.
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Affiliation(s)
- Hongyan Fu
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
| | - Lilin Yang
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
| | - Yaoguang Wang
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
| | - Chao Yang
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
| | - Wen Tian
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
| | - Wei Jiang
- Low-carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering , Sichuan University , Chengdu 610065 , PR China
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39
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Syafiq A, Pandey A, Balakrishnan V, Rahim NA. Study on self-cleaning performance and hydrophobicity of TiO 2/silane coatings. PIGMENT & RESIN TECHNOLOGY 2018; ahead-of-print. [DOI: 10.1108/prt-02-2018-0010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
PurposeThe paper aims to investigate the effect of Degussa P-25 Titanium Dioxide (TiO2) nanoparticles on hydrophobicity and self-cleaning ability as a single organic coating on glass substrate.Design/methodology/approachTwo methods have been used to enhance the hydrophobicity on glass substrates, namely, surface modification by using low surface energy isooctyltrimethoxysilane (ITMS) solution and construction of rough surface morphology using Degussa P-25 TiO2nanoparticles with simple bottom-up approach. The prepared sol was applied onto glass substrate using dip-coating technique and stoved in the vacuum furnace 350°C.FindingsThe ITMS coating with nano TiO2pigment has modified the glass substrate surface by achieving the water contact angle as high as 169° ± 2° and low sliding angle of 0° with simple and low-cost operation. The solid and air phase interface has created excellent anti-dirt and self-cleaning properties against dilute ketchup solution, mud and silicon powder.Research limitations/implicationsFindings will be useful in the development of self-cleaning and anti-dirt coating for photovoltaic panels.Practical implicationsSol method provides the suitable medium for the combination of organic–inorganic network to achieve high superhydrophobicity and optimum self-cleaning ability.Originality/valueApplication of blended organic–inorganic sol as self-cleaning and anti-dirt coating film.
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40
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Zhan H, Peng N, Lei X, Huang Y, Li D, Tao R, Chang C. UV-induced self-cleanable TiO2/nanocellulose membrane for selective separation of oil/water emulsion. Carbohydr Polym 2018; 201:464-470. [DOI: 10.1016/j.carbpol.2018.08.093] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Revised: 08/20/2018] [Accepted: 08/23/2018] [Indexed: 11/28/2022]
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41
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Superhydrophobic Surface Preparation and Wettability Transition of Titanium Alloy with Micro/Nano Hierarchical Texture. MATERIALS 2018; 11:ma11112210. [PMID: 30405075 PMCID: PMC6267334 DOI: 10.3390/ma11112210] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 10/26/2018] [Accepted: 10/31/2018] [Indexed: 11/23/2022]
Abstract
Microstructures are applied to various hydrophobic/hydrophilic surfaces due to the role of adjusting the surface wettability. In this paper, a 1064 nm pulsed picosecond laser was applied to prepare a micro/nano hierarchical structure on the surface of the titanium alloy (Ti-6Al-4V). The microstructures consist of dimple arrays with various diameters, depths, and areal densities. They are obtained by controlling the pulse energy and the number of pulses. The nanostructures are periodic ripples, which are defined as laser-induced periodic surface structure (LIPSS), and the dimensional parameter of LIPSS can be adjusted by changing the laser energy density and scanning speed. The contact angles of various laser textured surfaces were measured. It is found that the contact angle increases with the density of micro-textured surface increases, and the wetting state of textured surfaces conforms to the Cassie model. Some laser processed samples were subjected to low-temperature annealing treatment. It is observed that the low-temperature annealing process can accelerate the surface wettability transition significantly, which is attributed to the change of the hydroxyl groups on the surface. Finally, a superhydrophobic surface with the maximum contact angle of 144.58° is obtained.
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42
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Li XP, Sun YL, Xu YY, Chao ZS. UV-Resistant and Thermally Stable Superhydrophobic CeO 2 Nanotubes with High Water Adhesion. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801040. [PMID: 29862636 DOI: 10.1002/smll.201801040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Indexed: 06/08/2023]
Abstract
A novel type of sticky superhydrophobic cerium dioxide (CeO2 ) nanotube material is prepared by hydrothermal treatment without any chemical modification. A water droplet on the material surface shows a static water contact angle of about 157° but the water droplet is pinned on the material surface even when the material surface is turned upside down. Interestingly, the as-prepared CeO2 nanotube material displays durable superhydrophobicity and enhanced adhesion to water under ultraviolet (UV) light irradiation. Importantly, this change in water adhesion can be reversed by heat treatment to restore the original adhesive value of 20 µL. Further, the maximum volume of the water droplet adhered on the material surface of CeO2 nanotubes can be regulated without loss of superhydrophobicity during the heating treatment/UV-irradiation cycling. Meanwhile, the superhydrophobic CeO2 nanotube material shows remarkable thermal stability even at temperatures as high as 450 °C, long-term durability in chemical environment, and air-storage and good resistance to oily contaminant. Finally, the potential application in no-loss water transportation of this sticky superhydrophobic CeO2 material is demonstrated.
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Affiliation(s)
- Xue-Ping Li
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Ya-Li Sun
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Yao-Yi Xu
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Zi-Sheng Chao
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, 410114, China
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43
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Ollis D. Connecting contact angle evolution to photocatalytic kinetics of self cleaning surfaces. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.09.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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44
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Affiliation(s)
- Jürgen Fleig
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
| | - Markus Kubicek
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
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45
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Kang H, Liu Y, Lai H, Yu X, Cheng Z, Jiang L. Under-Oil Switchable Superhydrophobicity to Superhydrophilicity Transition on TiO 2 Nanotube Arrays. ACS NANO 2018; 12:1074-1082. [PMID: 29338192 DOI: 10.1021/acsnano.7b05813] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Recently, smart interfacial materials that can reversibly transit between the superhydrophobicity and superhydrophilicity have aroused much attention. However, all present performances happen in air, and to realize such a smart transition in complex environments, such as oil, is still a challenge. Herein, TiO2 nanotube arrays with switchable transition between the superhydrophobicity and superhydrophilicity in oil are reported. The switching can be observed by alternation of UV irradiation and heating process, and the smart controllability can be ascribed to the cooperative effect between the surface nanostructures and the chemical composition variation. By using the controllable wetting performances, some applications such as under-oil droplet-based microreaction and water-removal from oil were demonstrated on our surface. This paper reports a surface with smart water wettability in oil, which could start some fresh ideas for wetting control on interfacial materials.
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Affiliation(s)
- Hongjun Kang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China
| | - Yuyan Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China
| | - Hua Lai
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China
| | - Xiaoyan Yu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China
| | - Zhongjun Cheng
- Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology , Harbin 150001, P. R. China
| | - Lei Jiang
- Institute of Chemistry, Chinese Academy of Sciences , Beijing 100080, P. R. China
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Mahmoud HA, Narasimharao K, Ali TT, Khalil KMS. Acidic Peptizing Agent Effect on Anatase-Rutile Ratio and Photocatalytic Performance of TiO2 Nanoparticles. NANOSCALE RESEARCH LETTERS 2018; 13:48. [PMID: 29427190 PMCID: PMC5807258 DOI: 10.1186/s11671-018-2465-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Accepted: 01/28/2018] [Indexed: 05/31/2023]
Abstract
TiO2 nanoparticles were synthesized from titanium isopropoxide by a simple peptization method using sulfuric, nitric, and acetic acids. The effect of peptizing acid on physicochemical and photocatalytic properties of TiO2 powders was studied. The structural properties of synthesized TiO2 powders were analyzed by using XRD, TEM, N2-physisorption, Raman, DR UV-vis, FTIR, and X-ray photoelectron spectroscopy techniques. The characterization results showed that acetic acid peptization facilitated the formation of pure anatase phase after thermal treatment at 500 °C; in contrast, nitric acid peptization led to a major rutile phase formation (67%). Interestingly, the sample peptized using sulfuric acid yielded 95% anatase and 5% rutile phases. The photocatalytic activity of synthesized TiO2 nanoparticles was evaluated for degradation of selected organic dyes (crystal violet, methylene blue, and p-nitrophenol) in aqueous solution. The results confirmed that the TiO2 sample peptized using nitric acid (with rutile and anatase phases in 3:1 ratio) offered the highest activity for degradation of organic dyes, although, TiO2 samples peptized using sulfuric acid and acetic acid possessed smaller particle size, higher band gap energy, and high surface area. Interestingly, TiO2 sample peptized with nitric acid possessed relatively high theoretical photocurrent density (0.545 mAcm-2) and pore diameter (150 Å), which are responsible for high electron-hole separation efficiency and diffusion and mass transportation of organic reactants during the photochemical degradation process. The superior activity of TiO2 sample peptized with nitric acid is due to the effective transfer of photogenerated electrons between rutile and anatase phases.
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Affiliation(s)
- Hatem A. Mahmoud
- Chemistry Department, Faculty of Science, Sohag University, P.O. Box 82524, Sohag, Egypt
- Chemistry Department, College of Science, University of Hail, Ha’il, 81451 Kingdom of Saudi Arabia
| | - Katabathini Narasimharao
- Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box, 80203, Jeddah, 21589 Kingdom of Saudi Arabia
| | - Tarek T. Ali
- Chemistry Department, Faculty of Science, Sohag University, P.O. Box 82524, Sohag, Egypt
- Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box, 80203, Jeddah, 21589 Kingdom of Saudi Arabia
| | - Kamal M. S. Khalil
- Chemistry Department, Faculty of Science, Sohag University, P.O. Box 82524, Sohag, Egypt
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47
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Direct measurement of the contact angle of water droplet on quartz in a reservoir rock with atomic force microscopy. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.12.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Tran MQ, Nakata K, Horikoshi S. Improvement of Wettability of Photocatalytic TiO 2–Coated Wafers by Microwave/UV Pre-treatment. J Oleo Sci 2018; 67:1171-1175. [DOI: 10.5650/jos.ess18133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Minh Quang Tran
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University
- Photocatalytic International Research Center, Research Institute of Science and Technology, Tokyo University of Science
| | - Kazuya Nakata
- Photocatalytic International Research Center, Research Institute of Science and Technology, Tokyo University of Science
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science
| | - Satoshi Horikoshi
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University
- Photocatalytic International Research Center, Research Institute of Science and Technology, Tokyo University of Science
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49
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Zhao W, Wu Y, Cai T, Zhang W, Chen X, Liu D. Density functional theory and reactive dynamics study of catalytic performance of TiO2 on CO2 desorption process with KHCO3/TiO2/Al2O3 sorbent. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.06.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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50
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Chang HP, Chu ED, Yeh YT, Wu YC, Lo FY, Wang WH, Chern MY, Chiu HC. Influence of Oxygen Vacancies on the Frictional Properties of Nanocrystalline Zinc Oxide Thin Films in Ambient Conditions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8362-8371. [PMID: 28812363 DOI: 10.1021/acs.langmuir.7b01242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Oxygen vacancy is the most studied point defect and has been found to significantly influence the physical properties of zinc oxide (ZnO). By using atomic force microscopy (AFM), we show that the frictional properties on the ZnO surface at the nanoscale greatly depend on the amount of oxygen vacancies present in the surface layer and the ambient humidity. The photocatalytic effect (PCE) is used to qualitatively control the amount of oxygen vacancies in the surface layer of ZnO and reversibly switch the surface wettability between hydrophobic and superhydrophilic states. Because oxygen vacancies in the ZnO surface can attract ambient water molecules, during the AFM friction measurement, water meniscus can form between the asperities at the AFM tip-ZnO contact due to the capillary condensation, leading to negative dependence of friction on the logarithm of tip sliding velocity. Such dependence is found to be a strong function of relative humidity and can be reversibly manipulated by the PCE. Our results indicate that it is possible to control the frictional properties of ZnO surface at the nanoscale using optical approaches.
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Affiliation(s)
- Huan-Pu Chang
- Department of Physics, National Taiwan Normal University , Taipei City 11677, Taiwan
| | - En-De Chu
- Department of Physics, National Taiwan Normal University , Taipei City 11677, Taiwan
| | - Yu-Ting Yeh
- Department of Physics, National Taiwan Normal University , Taipei City 11677, Taiwan
| | - Yueh-Chun Wu
- Institute of Atomic and Molecular Science, Academic Sinica , Taipei City 10617, Taiwan
| | - Fang-Yuh Lo
- Department of Physics, National Taiwan Normal University , Taipei City 11677, Taiwan
| | - Wei-Hua Wang
- Institute of Atomic and Molecular Science, Academic Sinica , Taipei City 10617, Taiwan
| | - Ming-Yau Chern
- Department of Physics, National Taiwan University , Taipei City 10617, Taiwan
| | - Hsiang-Chih Chiu
- Department of Physics, National Taiwan Normal University , Taipei City 11677, Taiwan
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