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Chao Y, Deng N, Zhou Z. A review of recent advances in metal-organic frameworks materials for zero-energy passive adsorption of chemical pollutants in indoor environments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 953:175926. [PMID: 39218109 DOI: 10.1016/j.scitotenv.2024.175926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2024] [Revised: 07/26/2024] [Accepted: 08/29/2024] [Indexed: 09/04/2024]
Abstract
Approximately 75-90 % of a person's lifetime is spent inside increasingly airtight buildings, where indoor pollutant levels typically exceed those outdoors. Poor indoor air quality can lead to allergies, respiratory diseases, and even cancer, and can also reduce the longevity of buildings. Passive adsorption materials play a crucial role in reducing indoor pollutants. This review highlights the latest advances in using Metal-organic Frameworks (MOFs) as passive adsorption materials for indoor pollutant capture and outlines the principles for developing high-performance adsorbents. It provides a comparative analysis of the development and performance of MOFs and composite adsorbent materials, highlighting their respective advantages and limitations in indoor pollutant adsorption technology. The article proposes strategies to address these challenges and offers a comprehensive review of current practical adsorption devices. Finally, aiming to advance commercialization of MOFs, the anticipated development of indoor pollutant adsorption technology is discussed in this paper.
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Affiliation(s)
- Yuechao Chao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Na Deng
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Zhihua Zhou
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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2
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Vasiljevic M, Chiabrera F, Alikin D, Motti F, Bergne A, Zamudio-García J, Qin X, Dagur D, Yun S, Marrero-López D, Vinai G, Castelli I, Kholkin A, Esposito V. Tunable Ferroionic Properties in CeO 2/BaTiO 3 Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2024; 16:50679-50689. [PMID: 39268861 DOI: 10.1021/acsami.4c09477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/15/2024]
Abstract
Ferroionic materials combine ferroelectric properties and spontaneous polarization with ionic phenomena of fast charge recombination and electrodic functionalities. In this paper, we propose the concept of tunable polarization in CeO2-δ (ceria) thin (5 nm) films induced by built-in remnant polarization of a BaTiO3 (BTO) ferroelectric thin film interface, which is buried under the ceria layer. Upward and downward fixed polarizations at the BTO thin film (10 nm) are achieved by the lattice termination engineering of the SrO or TiO2 terminated Nb:SrTiO3 (NSTO or STN) substrate. We find that the ceria layer punctually replicates the polarization of the BTO interface via a dynamic reconfiguration of its intrinsic defects, i.e., oxygen vacancies and small polarons. Tunable oxidative or reducing properties (redox) also arise at the surface from the built-in polarization. Opposite polarities at the ceria termination tune the chemo-physical dynamics toward water molecule adsorbates. The inversion of the surface potential leads to a modulation of the water adsorption-desorption equilibrium and water ionization (splitting) redox overpotentials within ±400 mV at room temperature, depending on the ceria termination's charges. Such tunability opens up the perspectives of using ferroionics for wireless electrochemically enhanced catalysis.
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Affiliation(s)
- Milica Vasiljevic
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | - Francesco Chiabrera
- Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 2a Pl., Sant Adrià del Besòs, Barcelona 08930, Spain
| | - Denis Alikin
- Department of Physics & CICECO - Aveiro Institute of Materials, Universty of Aveiro, Aveiro 3810-193, Portugal
| | - Federico Motti
- CNR - Istituto Officina dei Materiali (IOM), Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Achilles Bergne
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | - Javier Zamudio-García
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | - Xueping Qin
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | - Deepak Dagur
- CNR - Istituto Officina dei Materiali (IOM), Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Shinhee Yun
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | | | - Giovanni Vinai
- CNR - Istituto Officina dei Materiali (IOM), Area Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Ivano Castelli
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
| | - Andrei Kholkin
- Department of Physics & CICECO - Aveiro Institute of Materials, Universty of Aveiro, Aveiro 3810-193, Portugal
| | - Vincenzo Esposito
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark
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Kongjaroen A, Gamonpilas C, Methacanon P. Effects of dispersing media on the rheological and tribological properties of basil seed mucilage-based thickened liquids. J Texture Stud 2024; 55:e12852. [PMID: 38952166 DOI: 10.1111/jtxs.12852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Revised: 06/04/2024] [Accepted: 06/15/2024] [Indexed: 07/03/2024]
Abstract
The development of thickening powders for the management of dysphagia is imperative due to the rapid growth of aging population and prevalence of the dysphagia. One promising thickening agent that can be used to formulate dysphagia diets is basil seed mucilage (BSM). This work investigates the effects of dispersing media, including water, milk, skim milk, and apple juice, on the rheological and tribological properties of the BSM-thickened liquids. Shear rheology results revealed that the thickening ability of BSM in these media in ascending order is milk < skim milk ≈ apple juice < water. On the other hand, extensional rheology demonstrated that the longest filament breakup time was observed when BSM was dissolved in milk, followed by skim milk, water, and apple juice. Furthermore, tribological measurements showed varying lubrication behavior, depending on the BSM concentration and dispersing media. Dissolution of BSM in apple juice resulted in the most superior lubrication property compared with that in other dispersing media. Overall, this study provides insights on BSM's application as a novel gum-based thickening powder in a range of beverages and emphasizes how important it is for consumers to have clear guidance for the use of BSM in dysphagia management.
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Affiliation(s)
- Akapong Kongjaroen
- Advanced Polymer Technology Research Group, National Metal and Materials Technology Center (MTEC), NSTDA, Khlong Luang, Thailand
| | - Chaiwut Gamonpilas
- Advanced Polymer Technology Research Group, National Metal and Materials Technology Center (MTEC), NSTDA, Khlong Luang, Thailand
| | - Pawadee Methacanon
- Advanced Polymer Technology Research Group, National Metal and Materials Technology Center (MTEC), NSTDA, Khlong Luang, Thailand
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Ossola R, Farmer D. The Chemical Landscape of Leaf Surfaces and Its Interaction with the Atmosphere. Chem Rev 2024; 124:5764-5794. [PMID: 38652704 PMCID: PMC11082906 DOI: 10.1021/acs.chemrev.3c00763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 04/03/2024] [Accepted: 04/11/2024] [Indexed: 04/25/2024]
Abstract
Atmospheric chemists have historically treated leaves as inert surfaces that merely emit volatile hydrocarbons. However, a growing body of evidence suggests that leaves are ubiquitous substrates for multiphase reactions-implying the presence of chemicals on their surfaces. This Review provides an overview of the chemistry and reactivity of the leaf surface's "chemical landscape", the dynamic ensemble of compounds covering plant leaves. We classified chemicals as endogenous (originating from the plant and its biome) or exogenous (delivered from the environment), highlighting the biological, geographical, and meteorological factors driving their contributions. Based on available data, we predicted ≫2 μg cm-2 of organics on a typical leaf, leading to a global estimate of ≫3 Tg for multiphase reactions. Our work also highlighted three major knowledge gaps: (i) the overlooked role of ambient water in enabling the leaching of endogenous substances and mediating aqueous chemistry; (ii) the importance of phyllosphere biofilms in shaping leaf surface chemistry and reactivity; (iii) the paucity of studies on the multiphase reactivity of atmospheric oxidants with leaf-adsorbed chemicals. Although biased toward available data, we hope this Review will spark a renewed interest in the leaf surface's chemical landscape and encourage multidisciplinary collaborations to move the field forward.
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Affiliation(s)
- Rachele Ossola
- Department of Chemistry, Colorado
State University, 80523 Fort Collins, Colorado (United States)
| | - Delphine Farmer
- Department of Chemistry, Colorado
State University, 80523 Fort Collins, Colorado (United States)
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Almarzooqi N, Alwan RA, AlMarzooqi F, Ghaffour N, Hong S, Arafat HA. Solar-driven surface-heating membrane distillation using Ti 3C 2T x MXene-coated spacers. CHEMOSPHERE 2024; 351:141129. [PMID: 38199497 DOI: 10.1016/j.chemosphere.2024.141129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/19/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
The emergence of two-dimensional (2D) MXenes as efficient light-to-heat conversion materials offers significant potential for solar-based desalination, particularly in photothermal interfacial evaporation, enabling cost-effective solar-powered membrane distillation (MD). This study investigates solar-powered MD afforded by a photothermally functionalized spacer, which is built by spray-coating Ti3C2Tx MXene sheets on metallic spacers. 2D Ti3C2Tx MXene gives an ultrahigh photothermal conversion efficiency; thereby, by Ti3C2Tx MXene-coated metallic spacer, this rationally designed spacer allows for a localized photothermal conversion and interfacial feed heating effect on the membrane surface, especially for MD operation. As a feed spacer and a photothermal element, Ti3C2Tx MXene-coated metallic spacer exhibited stable enhanced water flux of up to 0.36 kg·m-2h-1 under one sun illumination for a feed salinity of 35 g·L-1, corresponding energy conversion efficiency of 28.3 %. Overall, the developed photothermal Ti3C2Tx MXene-coated spacers displayed great potential in enhancing the performance, scalability, and feasibility of solar-driven MD process, paving the way for further development of photothermal elements that can be implemented in solar MD applications.
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Affiliation(s)
- Noora Almarzooqi
- Department of Chemical & Petroleum Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Center for Membranes and Advanced Water Technology, Khalifa University, Abu Dhabi, 127788, United Arab Emirates
| | - Rawan Abu Alwan
- Department of Chemical & Petroleum Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Center for Membranes and Advanced Water Technology, Khalifa University, Abu Dhabi, 127788, United Arab Emirates
| | - Faisal AlMarzooqi
- Department of Chemical & Petroleum Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Center for Membranes and Advanced Water Technology, Khalifa University, Abu Dhabi, 127788, United Arab Emirates.
| | - Noreddine Ghaffour
- Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia; Environmental Science & Engineering Program, Biological & Environmental Science & Engineering Division, King Abdullah University of Science & Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Seunghyun Hong
- Department of Chemical & Petroleum Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Center for Membranes and Advanced Water Technology, Khalifa University, Abu Dhabi, 127788, United Arab Emirates.
| | - Hassan A Arafat
- Department of Chemical & Petroleum Engineering, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Center for Membranes and Advanced Water Technology, Khalifa University, Abu Dhabi, 127788, United Arab Emirates; Research and Innovation Center for Graphene and 2D Materials (RIC2D), Khalifa University, Abu Dhabi, 127788, United Arab Emirates.
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Miyauchi M. Water Adsorption on Hydrophilic Fibers and Porous and Deliquescent Materials: Cellulose, Polysaccharide, Silica, Inorganic Salt, Sugar Alcohol, and Amino Acid. ACS OMEGA 2023; 8:44212-44220. [PMID: 38027329 PMCID: PMC10666253 DOI: 10.1021/acsomega.3c06642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 10/24/2023] [Accepted: 10/26/2023] [Indexed: 12/01/2023]
Abstract
Water adsorption isotherms are systematically summarized by using celluloses and polysaccharides as hydrophilic crystal/amorphous materials with functional groups, silicas as hydrophilic porous materials, and inorganic salts, sugar alcohols, and amino acids as hygroscopic deliquescent materials. For hydrophilic fibers such as celluloses and polysaccharides, water was adsorbed on amorphous solids, and water clusters were formed around functional groups. For porous materials such as silicas, capillary condensation occurred in the micropores of silicas. For deliquescent materials such as inorganic salts, sugar alcohols, and amino acids, water adsorption rapidly increased stepwise at a specific threshold relative humidity, accompanied with a structure transformation to a liquid state. In addition, the water activity (Aw) of materials used in packed products was able to be estimated from the water adsorption isotherms of the pure component. This indicated that the deliquescent materials have a great effect on the depression of Aw for the suppression of microbial growth at an extremely high water content. The deliquescent materials could be useful to develop new environmentally and sustainable products and technologies with the mediation of water vapor and/or hydration.
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Affiliation(s)
- Masato Miyauchi
- Tobacco Science Research
Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama, Kanagawa 227-8512, Japan
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7
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He S, Jin X, Wang D, Hao D, Li Y, Zhu Z, Tian Y, Jiang L. Interfacial Water-Dictated Oil Adhesion Based on Ion Modulation. J Am Chem Soc 2023; 145:24145-24152. [PMID: 37874995 DOI: 10.1021/jacs.3c07975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
Oil adhesion on ionic surfaces is ubiquitous in organisms and natural environments and is generally determined by surface chemical component and texture. However, when adhesion occurs, water molecules at the solid-liquid interface, acting as a bridge not only influenced by the structure and composition of the solid surface but also interacting with the neighboring oil molecules, play a crucial role but are always overlooked. Herein, we investigate the oil adhesion process on a carboxyl-terminated self-assembled monolayer surface (COOH-SAM) in ionic solutions and observe the interfacial water structure via surface-enhanced Raman scattering (SERS) in this system. It is found that the lower the tetracoordinated water content, the stronger the oil adhesion. Compared to monovalent ions, the strengthened binding of multivalent ions to the COOH-SAM surface makes the interfacial water more disordered, which eventually leads to a stronger oil adhesion. Notably, the amount of oil adhesion decreases with an increase in the thickness of the interfacial water region. The interfacial water-dictated oil adhesion has been demonstrated in capillary to simulate the water-driven oil recovery, providing a molecular-level explanation for enhanced oil recovery from low salinity water flooding and also indicating potential applications in intelligent microfluidic and seawater desalination.
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Affiliation(s)
- Shaofan He
- Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xu Jin
- Research Institute of Petroleum Exploration and Development PetroChina, Beijing 100083, China
| | - Dianyu Wang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Dezhao Hao
- Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yulong Li
- Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhongpeng Zhu
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu 215123, China
| | - Ye Tian
- Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu 215123, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Jiang
- Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
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8
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Tran TLC, Guirguis A, Jeyachandran T, Wang Y, Cahill DM. Mesoporous silica nanoparticle-induced drought tolerance in Arabidopsis thaliana grown under in vitro conditions. FUNCTIONAL PLANT BIOLOGY : FPB 2023; 50:889-900. [PMID: 37055916 DOI: 10.1071/fp22274] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Nanoparticles of varying formats and functionalities have been shown to modify and enhance plant growth and development. Nanoparticles may also be used to improve crop production and performance, particularly under adverse environmental conditions such as drought. Nanoparticles composed of silicon dioxide, especially those that are mesoporous (mesoporous silica nanoparticles; MSNs), have been shown to be taken up by plants; yet their potential to improve tolerance to abiotic stress has not been thoroughly examined. In this study, a range of concentrations of MSNs (0-5000mgL-1 ) were used to determine their effects, in vitro , on Arabidopsis plants grown under polyethylene glycol (PEG)-simulated drought conditions. Treatment of seeds with MSNs during PEG-simulated drought resulted in higher seed germination and then greater primary root length. However, at the highest tested concentration of 5000mgL-1 , reduced germination was found when seeds were subjected to drought stress. At the optimal concentration of 1500mgL-1 , plants treated with MSNs under non-stressed conditions showed significant increases in root length, number of lateral roots, leaf area and shoot biomass. These findings suggest that MSNs can be used to stimulate plant growth and drought stress tolerance.
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Affiliation(s)
- Thi Linh Chi Tran
- Deakin University, School of Life and Environmental Sciences, Waurn Ponds, Vic. 3216, Australia
| | - Albert Guirguis
- Deakin University, School of Life and Environmental Sciences, Waurn Ponds, Vic. 3216, Australia
| | - Thanojan Jeyachandran
- Deakin University, Institute for Frontier Materials, Waurn Ponds, Vic. 3216, Australia
| | - Yichao Wang
- Deakin University, School of Life and Environmental Sciences, Waurn Ponds, Vic. 3216, Australia
| | - David M Cahill
- Deakin University, School of Life and Environmental Sciences, Waurn Ponds, Vic. 3216, Australia
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Jiang Y, Liu Z, Zhou H, Sharma A, Deng J, Ke C. Physical adsorption and oxidation of ultra-thin MoS 2crystals: insights into surface engineering for 2D electronics and beyond. NANOTECHNOLOGY 2023; 34:405701. [PMID: 37462320 DOI: 10.1088/1361-6528/ace1f7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/26/2023] [Indexed: 01/25/2024]
Abstract
The oxidation mechanism of atomically thin molybdenum disulfide (MoS2) plays a critical role in its nanoelectronics, optoelectronics, and catalytic applications, where devices often operate in an elevated thermal environment. In this study, we systematically investigate the oxidation of mono- and few-layer MoS2flakes in the air at temperatures ranging from 23 °C to 525 °C and relative humidities of 10%-60% by using atomic force microscopy (AFM), Raman spectroscopy and x-ray photoelectron spectroscopy. Our study reveals the formation of a uniform nanometer-thick physical adsorption layer on the surface of MoS2, which is attributed to the adsorption of ambient moisture. This physical adsorption layer acts as a thermal shield of the underlying MoS2lattice to enhance its thermal stability and can be effectively removed by an AFM tip scanning in contact mode or annealing at 400 °C. Our study shows that high-temperature thermal annealing and AFM tip-based cleaning result in chemical adsorption on sulfur vacancies in MoS2, leading to p-type doping. Our study highlights the importance of humidity control in ensuring reliable and optimal performance for MoS2-based electronic and electrochemical devices and provides crucial insights into the surface engineering of MoS2, which are relevant to the study of other two-dimensional transition metal dichalcogenide materials and their applications.
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Affiliation(s)
- Yingchun Jiang
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Zihan Liu
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Huimin Zhou
- Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Anju Sharma
- Small Scale Systems Integration and Packaging Center, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Jia Deng
- Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
| | - Changhong Ke
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
- Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, NY 13902, United States of America
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Davis S, Sivan U. Effective Stiffness of Hydrated Atomic Force Microscopy Tips. NANO LETTERS 2022; 22:6732-6736. [PMID: 35917222 DOI: 10.1021/acs.nanolett.2c02203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
When generating force curves with atomic force microscopy (AFM), the conventional assumption is that the silicon tip's apex is infinitely stiffer than the force gradient acting between the apex and test object. Although true for measurements in vacuum or at long distances, we show this assumption fails badly at short distances in aqueous environments. In this case, the effective apex is an adsorbed water molecule, bound by a weak O-H···O-H H-bond. At short distances, the magnitude of the force gradient exceeds the stiffness of this bond. This causes conventional AFM measurements to be dominated by the mechanical H-bond stiffness, instead of the force gradient. Here, we introduce a new multifrequency technique that is able to measure the surface force gradient independently from the H-bond. We compare our results to conventional FM-AFM and show that due to the H-bond, FM-AFM can give extremely erroneous measurements and even the wrong force polarity.
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Affiliation(s)
- Solomon Davis
- Department of Physics, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
| | - Uri Sivan
- Department of Physics, Technion - Israel Institute of Technology, Haifa, 3200003, Israel
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11
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A Pragmatic Perspective of the Initial Stages of the Contact Killing of Bacteria on Copper-Containing Surfaces. Appl Microbiol 2022. [DOI: 10.3390/applmicrobiol2030033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A consideration of the outer structures of Gram-positive and Gram-negative bacteria, and of the surface contaminants present on Cu-containing substrates, has led to the identification of Cu2O as a potent antimicrobial. In the presence of adsorbed water, the hydrated form ionizes to CuI-O−, which is capable of degrading the protective polysaccharide layer of the outer lipopolysaccharide membranes of Gram-negative bacteria; it is equally capable of attacking the peptidoglycan lattices present in both Gram-positive and Gram-negative bacteria. This Perspective underlines the importance of CuI-O− in the early stages of contact killing, and points to information, still lacking, that would optimize contact killing and lead to broader applications in the therapeutic management of bacterial infections.
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Кudelko К, Rozhdestvenskaya L, Ogenko V, Chmilenko V. Formation and characterisation of porous anodized aluminum oxide, synthesized electrochemically in the presence of graphene oxide. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02457-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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13
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Nakamura S, Tsuji Y, Yoshizawa K. Molecular Dynamics Study on the Thermal Aspects of the Effect of Water Molecules at the Adhesive Interface on an Adhesive Structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14724-14732. [PMID: 34870994 DOI: 10.1021/acs.langmuir.1c02653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The presence of adsorbed water on hydrophilic solid surfaces should be taken into account, especially in humid environments. It significantly reduces the adhesive strength between the epoxy resin and the adherend surface. Here, the adhesion structure of interfacial water sandwiched between bisphenol A epoxy resin and a hydroxylated silica (001) surface is investigated with microsecond molecular dynamics simulations. Specifically, interfacial water layers with initial thicknesses of 7.5, 10, and 20 Å are modeled. The density curves of water and the diglycidyl ether of bisphenol A show that at room temperature, the surface of the silica with hydroxyl groups is completely covered with a thick layer of water. For water layers thinner than 10 Å, the density of epoxy resin on the silica surface increases when the system is heated and does not return to the original density when the system is cooled. Furthermore, calculation of the interaction energy revealed that the exclusion of water from the hydroxylated surface by epoxy resin during heating can contribute to the increase in the adhesive interaction between the epoxy resin and the silica surface with hydroxyl groups.
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Affiliation(s)
- Shin Nakamura
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yuta Tsuji
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
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14
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O’Callahan B, Qafoku O, Balema V, Negrete OA, Passian A, Engelhard MH, Waters KM. Atomic Force Microscopy and Infrared Nanospectroscopy of COVID-19 Spike Protein for the Quantification of Adhesion to Common Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:12089-12097. [PMID: 34609882 PMCID: PMC8507151 DOI: 10.1021/acs.langmuir.1c01910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 09/13/2021] [Indexed: 06/13/2023]
Abstract
The COVID-19 pandemic has claimed millions of lives worldwide, sickened many more, and has resulted in severe socioeconomic consequences. As society returns to normal, understanding the spread and persistence of SARS CoV-2 on commonplace surfaces can help to mitigate future outbreaks of coronaviruses and other pathogens. We hypothesize that such an understanding can be aided by studying the binding and interaction of viral proteins with nonbiological surfaces. Here, we propose a methodology for investigating the adhesion of the SARS CoV-2 spike glycoprotein on common inorganic surfaces such as aluminum, copper, iron, silica, and ceria oxides as well as metallic gold. Quantitative adhesion was obtained from the analysis of measured forces at the nanoscale using an atomic force microscope operated under ambient conditions. Without imposing further constraints on the measurement conditions, our preliminary findings suggest that spike glycoproteins interact with similar adhesion forces across the majority of the metal oxides tested with the exception to gold, for which attraction forces ∼10 times stronger than all other materials studied were observed. Ferritin, which was used as a reference protein, was found to exhibit similar adhesion forces as SARS CoV-2 spike protein. This study results show that glycoprotein adhesion forces for similar ambient humidity, tip shape, and contact surface are nonspecific to the properties of metal oxide surfaces, which are expected to be covered by a thin water film. The findings suggest that under ambient conditions, glycoprotein adhesion to metal oxides is primarily controlled by the water capillary forces, and they depend on the surface tension of the liquid water. We discuss further strategies warranted to decipher the intricate nanoscale forces for improved quantification of the adhesion.
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Affiliation(s)
- Brian O’Callahan
- Earth
and Biological Sciences Division, Pacific
Northwest National Laboratory, Richland, Washington 99352, United States
| | - Odeta Qafoku
- Earth
and Biological Sciences Division, Pacific
Northwest National Laboratory, Richland, Washington 99352, United States
| | - Viktor Balema
- Ames
Laboratory, U.S. Department of Energy, Iowa
State University, Ames, Iowa 50011, United States
| | - Oscar A. Negrete
- Biotechnology
and Bioengineering Department, Sandia National
Laboratories, Livermore, California 94550, United States
| | - Ali Passian
- Quantum
Information Science Group, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Mark H. Engelhard
- Earth
and Biological Sciences Division, Pacific
Northwest National Laboratory, Richland, Washington 99352, United States
| | - Katrina M. Waters
- Earth
and Biological Sciences Division, Pacific
Northwest National Laboratory, Richland, Washington 99352, United States
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15
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Turov VV, Gun’ko VM, Krupska TV, Borysenko MV, Tsapko MD, Guzenko NV, Kartel MT. Temperature (200–283 K) dependence of methane adsorption onto hydrophobic nanosilica/arginine composite at various hydration. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Ura D, Knapczyk-Korczak J, Szewczyk PK, Sroczyk EA, Busolo T, Marzec MM, Bernasik A, Kar-Narayan S, Stachewicz U. Surface Potential Driven Water Harvesting from Fog. ACS NANO 2021; 15:8848-8859. [PMID: 33900735 PMCID: PMC8158858 DOI: 10.1021/acsnano.1c01437] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 04/02/2021] [Indexed: 05/08/2023]
Abstract
Access to clean water is a global challenge, and fog collectors are a promising solution. Polycarbonate (PC) fibers have been used in fog collectors but with limited efficiency. In this study, we show that controlling voltage polarity and humidity during the electrospinning of PC fibers improves their surface properties for water collection capability. We experimentally measured the effect of both the surface morphology and the chemistry of PC fiber on their surface potential and mechanical properties in relation to the water collection efficiency from fog. PC fibers produced at high humidity and with negative voltage polarity show a superior water collection rate combined with the highest tensile strength. We proved that electric potential on surface and morphology are crucial, as often designed by nature, for enhancing the water collection capabilities via the single-step production of fibers without any postprocessing needs.
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Affiliation(s)
- Daniel
P. Ura
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Joanna Knapczyk-Korczak
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Piotr K. Szewczyk
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Ewa A. Sroczyk
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Tommaso Busolo
- Department
of Materials Science and Metallurgy, University
of Cambridge, CB3 0FS Cambridge, United Kingdom
| | - Mateusz M. Marzec
- Academic
Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Andrzej Bernasik
- Academic
Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Kraków, Poland
- Faculty
of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
| | - Sohini Kar-Narayan
- Department
of Materials Science and Metallurgy, University
of Cambridge, CB3 0FS Cambridge, United Kingdom
| | - Urszula Stachewicz
- Faculty
of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland
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17
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Yang K, Pan T, Lei Q, Dong X, Cheng Q, Han Y. A Roadmap to Sorption-Based Atmospheric Water Harvesting: From Molecular Sorption Mechanism to Sorbent Design and System Optimization. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:6542-6560. [PMID: 33914502 DOI: 10.1021/acs.est.1c00257] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Sorption-based atmospheric water harvesting (SAWH), which uses sorbents to capture water vapor from the air and low-grade energy to produce fresh liquid water, has been recognized as a promising strategy for decentralized water supply in arid areas. This review aims to summarize the latest progress in this field and provide perspectives for the further development of SAWH, focusing on the design of sorbent materials and the optimization of the entire system. We first introduce the water sorption mechanisms on different sorbent materials. Next, we discuss the properties and performances of various sorbents developed for SAWH by categorizing them into specific groups: nanoporous solids, hygroscopic polymers, salt-based composites, and liquid sorbents; for each type of sorbent materials, we have analyzed its advantages and limitations, as well as design strategies. In addition, we discuss the influences of the mass and heat transport of the SAWH system on its overall performance in actual operations, and introduce different types of water harvesters developed for SAWH. In the last section, we outline the challenges in this field from fundamental research and practical application aspects, and describe roadmaps for the future development of this technology.
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Affiliation(s)
- Kaijie Yang
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Tingting Pan
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Qiong Lei
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Xinglong Dong
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Qingpeng Cheng
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Yu Han
- Advanced Membranes and Porous Materials (AMPM) Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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18
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Chirinos-Flores D, Sánchez R, Díaz-Leyva P, Kozina A. Gelation of amphiphilic janus particles in an apolar medium. J Colloid Interface Sci 2021; 590:12-18. [PMID: 33524712 DOI: 10.1016/j.jcis.2021.01.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS The anisotropic nature of colloidal particles results in orientation-dependent interactions that organize the particles into peculiar structures different from those formed by isotropic colloids. Particles with a hydrophilic hemisphere are expected to assemble in hydrophobic solvents due to the contribution of hydrophobic interactions as observed for molecular amphiphiles. EXPERIMENTS Asymmetrically decorated silica-based Janus particles are dispersed in an apolar solvent, chloroform, and their structure and dynamics are studied by light scattering and compared with computer simulations. FINDINGS Gelation of amphiphilic Janus particles with asymmetric surface decoration is observed in a hydrophobic medium. The influence of particle asymmetry on gel structure and dynamics is discussed. Unlike particles with long-range repulsive interactions in water, these systems rapidly form rather compact structures that are nevertheless more ramified than those made of isotropic hydrophobic particles. Comparison with computer simulations allows visualization of the gel and reveals a contribution of asymmetric short-range attractions and cross-term repulsions to the net effective interaction potential.
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Affiliation(s)
- Denise Chirinos-Flores
- Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Mexico City, Mexico
| | - Rodrigo Sánchez
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Pedro Díaz-Leyva
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Anna Kozina
- Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Mexico City, Mexico.
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19
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Ovchinnikov IS, Vishnevskiy AS, Seregin DS, Rezvanov AA, Schneider D, Sigov AS, Vorotilov KA, Baklanov MR. Evaluation of Mechanical Properties of Porous OSG Films by PFQNM AFM and Benchmarking with Traditional Instrumentation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9377-9387. [PMID: 32709205 DOI: 10.1021/acs.langmuir.0c01054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Characterization of mechanical properties of thin porous films with nanoscale resolution remains a challenge for instrumentation science. In this work, atomic force microscopy (AFM) in the PeakForce quantitative nanomechanical mapping (PFQNM) mode is used for Young's modulus measurements of porous organosilicate glass films. The test samples were prepared by sol-gel techniques using silicon alkoxide and methyl-modified silicon alkoxide to prepare films with different CH3/Si ratios. The film porosity was engineered by using a Brij 30 template and the evaporation-induced self-assembly technique. The chemical composition, pore structure, and modification during air storage and thermal annealing were studied using FTIR spectroscopy and ellipsometric porosimetry (EP). Since PFQNM AFM was first used for evaluation of Young's modulus of thin porous films, the obtained results are benchmarked using nanoindentation (NI), surface acoustic wave (SAW) spectroscopy, and EP. The results have good agreement with each other, but PFQNM and NI give slightly larger values than SAW and EP. The difference is in agreement with previously reported data and reflects the different physical meaning of the obtained values. It is shown that the presence of physically adsorbed water strongly influences the results generated by PFQNM AFM, and therefore, reliable water removal from the studied materials is necessary.
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Affiliation(s)
- I S Ovchinnikov
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
| | - A S Vishnevskiy
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
| | - D S Seregin
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
| | - A A Rezvanov
- Moscow Institute of Physics and Technology (MIPT), 9 Institutskiy per., Dolgoprudny, Moscow Region 141700, Russian Federation
- Molecular Electronics Research Institute (MERI), 1st Zapadny Proezd 12/1, Zelenograd, Moscow 124460, Russian Federation
| | - D Schneider
- Fraunhofer-Institute for Material and Beam Technology, Winterbergstrasse 28, Dresden D-01277, Germany
| | - A S Sigov
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
| | - K A Vorotilov
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
| | - M R Baklanov
- MIREA-Russian Technological University (RTU MIREA), Vernadsky Avenue 78, Moscow 119454, Russian Federation
- North China University of Technology (NCUT), No. 5 Jinyuanzhuang Road, Shijingshan, Beijing 100144, China
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20
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Synthesis of In Situ Photoinduced Halloysite-Polypyrrole@Silver Nanocomposite for the Potential Application in Humidity Sensors. NANOMATERIALS 2020; 10:nano10071426. [PMID: 32708297 PMCID: PMC7407375 DOI: 10.3390/nano10071426] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 07/10/2020] [Accepted: 07/13/2020] [Indexed: 11/17/2022]
Abstract
Halloysite-polypyrrole-silver nanocomposite has been prepared via in situ photopolymerizations of pyrrole in the presence of silanized halloysite and silver nitrate as a photoinitiator. The halloysite nanoclay (HNT) was modified using the hydrogen donor silane coupling agent (DMA) in order to provide anchoring sites for the polypyrrole/silver composite (PPy@Ag). The mass loadings for both PPy and Ag have been estimated to be 21 and 26 wt%, respectively. The anchored Ag particles were found in the metallic state. The resulting PPy@Ag-modified silanized HNT has been evaluated for the potential application for impedance humidity sensors. HNT-DMA-PPy@Ag nanocomposite with different weight % of PPy@Ag (0.25 wt%, 0.5 wt%, and 1 wt%) was deposited on the pre-patterned interdigital Indium Tin Oxide (ITO) electrodes by spin coating technique. The addition of Ag nanoparticles within the nanocomposite enhances the hydrophilicity of the sensing film, which improves the sensitivity of the humidity sensors. The HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors showed good sensitivity and lowered hysteresis as compared to the other ratios of the composite. The maximum calculated hysteresis loss of the HNT-DMA-PPy@Ag (0.5 wt%)-based humidity sensor is around 4.5% at 80% RH (relative humidity), and the minimum hysteresis loss estimated to be 0.05% at 20% RH levels. The response and recovery time of HNT-DMA-PPy@Ag (0.5 wt%) nanocomposite-based impedance sensors were found to be 30 and 35 s, respectively. The interesting humidity-dependent impedance properties of this novel composite make it promising in humidity sensing.
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21
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Xiao C, Chen C, Yao Y, Liu H, Chen L, Qian L, Kim SH. Nanoasperity Adhesion of the Silicon Surface in Humid Air: The Roles of Surface Chemistry and Oxidized Layer Structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5483-5491. [PMID: 32357012 DOI: 10.1021/acs.langmuir.0c00205] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The interfacial adhesion between silicon oxide surfaces is normally believed to be governed by the surface chemistry of the topmost surface affecting the water contact angle and hydrogen bonding interactions. In the case of a silicon wafer, the physical structure of the native oxide at the surface can vary drastically depending on the aging process; thus, not only the surface chemistry but also the history of surface treatment can also have a profound impact on nanoasperity adhesion. This study reports the effect of aging conditions (ambient air, liquid water, and liquid ethanol) on the nanoasperity adhesion behaviors of a silicon surface. When the silicon surface is kept in liquid alcohol, the surface remains hydrophobic, and adhesion in ambient air can be explained with the capillary effect of the liquid meniscus condensed around the annulus of the nanoasperity contact. When the silicon surface is oxidized in ambient air, the surface gradually becomes hydrophilic, and the strongly hydrogen-bonded water network of adsorbed water plays a dominant role in the nanoasperity interfacial adhesion force. When the silicon surface is aged in liquid water, the interfacial adhesion force measured in ambient air is significantly larger than the value predicted from the theoretical model based on the water contact angle and the hydrogen bonding interaction at the topmost surface. This is because the surface layer oxidized in liquid water is gel-like and thus can swell upon uptake of water from the humid air. To fully encompass all these behaviors, a solid-adsorbate-solid model predicting the adhesion force is developed by introducing a fitting parameter β, which can be adjusted depending on the adsorbed water structure and the swelling capacity of the oxidized surface layer.
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Affiliation(s)
- Chen Xiao
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Chao Chen
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Yangyang Yao
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Hongshen Liu
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Lei Chen
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Linmao Qian
- Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
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22
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Erratum: Thickness and Structure of Adsorbed Water Layer and Effects on Adhesion and Friction at Nanoasperity Contact. Colloids Interfaces 2019, 3, 55. COLLOIDS AND INTERFACES 2020. [DOI: 10.3390/colloids4020021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Editorial Office of Colloids and Interfaces would like to make the following correction to the paper by Xiao, C [...]
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23
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Krause F, Renner B, Coppens F, Dewanckele J, Schwotzer M. Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms. MATERIALS 2020; 13:ma13061427. [PMID: 32245074 PMCID: PMC7142976 DOI: 10.3390/ma13061427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 03/15/2020] [Accepted: 03/17/2020] [Indexed: 12/25/2022]
Abstract
The thermal stability of gypsum-based materials, and in this context, especially their long-term behavior, is the background of our current research activities. A comprehensive investigation program was compiled in which detailed examinations of various model materials exposed to thermal loads were carried out. The understanding of the partly not entirely consistent state of knowledge shall be sharpened especially by in situ observations of the thermally induced conversion reaction of gypsum into hemihydrate. The temporal course of the reaction was investigated non-destructively by in situ investigations in a high-resolution X-ray computed tomography setup, and the experiment was accompanied by detailed characterizations of the microstructure and composition. In this contribution, selected results of experiments with a high-purity natural gypsum rock as the model substance are presented. Studying the influence of temperature on the reaction showed that, even under supposedly dry conditions, the reaction could take place at much lower temperatures than usually reported in the literature. It was demonstrated that the transformation of gypsum into hemihydrate could take place at a temperature of already 50 °C. The results indicated that even under “classical” heating conditions in a conventional oven, the dissolution and crystallization processes in water films on the mineral surfaces could be suggested to be a driving force for the reaction. A corresponding reaction model, which took these aspects into account, was proposed in this work.
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Affiliation(s)
- Felix Krause
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), 76344 Eggenstein-Leopoldshafen, Germany;
| | | | | | | | - Matthias Schwotzer
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG), 76344 Eggenstein-Leopoldshafen, Germany;
- Correspondence: ; Tel.: +49-721-608-24627
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24
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Chen L, Ngo D, Luo J, Gong Y, Xiao C, He X, Yu B, Qian L, Kim SH. Dependence of water adsorption on the surface structure of silicon wafers aged under different environmental conditions. Phys Chem Chem Phys 2019; 21:26041-26048. [PMID: 31746864 DOI: 10.1039/c9cp04776j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Most materials exposed to ambient air can adsorb water molecules and the adsorption capability strongly depends on the surface property. The water contact angle has been widely used as a measure for surface wettability; however, a question can still be asked whether the water contact angle can be used as an adequate sole predictor for water adsorption on the surface in humid air. In this paper, HF-etched silicon wafers were aged (oxidized) under different environmental conditions at room temperature to grow surface layers with varying water contact angles from ∼0° (fully hydrophilic) to ∼83° (highly hydrophobic), and water adsorption as a function of relative humidity (RH) was studied on such surfaces. The thickness and structure of the adsorbed water layer were found to depend on not only the surface wettability on each surface, but also the history of surface oxidation conditions. In particular, the silicon wafer surface oxidized in liquid water uptakes significantly more water from humid air than the fully-hydroxylated native oxide surface (SiOx/OH), even though its water contact angle is higher than that on the SiOx/OH surface. This could be attributed to the formation of a gel-like structure during oxidation in liquid water.
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Affiliation(s)
- Lei Chen
- Tribology Research Institute, Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
| | - Dien Ngo
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
| | - Jiawei Luo
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
| | - Yunfei Gong
- Tribology Research Institute, Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
| | - Chen Xiao
- Tribology Research Institute, Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
| | - Xin He
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
| | - Bingjun Yu
- Tribology Research Institute, Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
| | - Linmao Qian
- Tribology Research Institute, Key Laboratory of Advanced Technology of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
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