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Hörmann JL, Liu C, Meng Y, Pastewka L. Molecular simulations of sliding on SDS surfactant films. J Chem Phys 2023; 158:244703. [PMID: 37377159 DOI: 10.1063/5.0153397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023] Open
Abstract
We use molecular dynamics simulations to study the frictional response of monolayers of the anionic surfactant sodium dodecyl sulfate and hemicylindrical aggregates physisorbed on gold. Our simulations of a sliding spherical asperity reveal the following two friction regimes: at low loads, the films show Amonton's friction with a friction force that rises linearly with normal load, and at high loads, the friction force is independent of the load as long as no direct solid-solid contact occurs. The transition between these two regimes happens when a single molecular layer is confined in the gap between the sliding bodies. The friction force at high loads on a monolayer rises monotonically with film density and drops slightly with the transition to hemicylindrical aggregates. This monotonous increase of friction force is compatible with a traditional plowing model of sliding friction. At low loads, the friction coefficient reaches a minimum at the intermediate surface concentrations. We attribute this behavior to a competition between adhesive forces, repulsion of the compressed film, and the onset of plowing.
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Affiliation(s)
- Johannes L Hörmann
- Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
- Cluster of Excellence livMatS, Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany
| | - Chenxu Liu
- State Key Laboratory of Tribology in Advanced Equipment, Lee Shau Kee Science and Technology Building, Tsinghua University, Haidian District, Beijing 100084, China
| | - Yonggang Meng
- State Key Laboratory of Tribology in Advanced Equipment, Lee Shau Kee Science and Technology Building, Tsinghua University, Haidian District, Beijing 100084, China
| | - Lars Pastewka
- Department of Microsystems Engineering, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
- Cluster of Excellence livMatS, Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany
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2
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Yesufu-Rufai S, Georgiadis A, van Wunnik J, Luckham P. Influence of divalent ion concentration on the adhesion behaviour of sulfonate self-assembled monolayers (SAM). Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Scerbacova A, Ivanova A, Grishin P, Cheremisin A, Tokareva E, Tkachev I, Sansiev G, Fedorchenko G, Afanasiev I. Application of alkalis, polyelectrolytes, and nanoparticles for reducing adsorption loss of novel anionic surfactant in carbonate rocks at high salinity and temperature conditions. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129996] [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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4
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Regulation Mechanism for Friction Coefficient of Poly(vinylphosphoric acid) (PVPA) Superlubricity System Based on Ionic Properties. NANOMATERIALS 2022; 12:nano12132308. [PMID: 35808147 PMCID: PMC9268071 DOI: 10.3390/nano12132308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/29/2022] [Accepted: 07/02/2022] [Indexed: 02/05/2023]
Abstract
Adjustable lubrication aims to achieve active control of the relative motion of the friction interface, providing a new idea for intelligent operation. A new phenomenon of sudden changes of friction coefficient (COF) in the poly(vinylphosphoric acid) (PVPA) superlubricity system by mixing different lubricants, was found in this study. It was found that anions were the critical factor for the COF change. The change degrees of the COF were investigated by a universal micro tribometer (UMT). A quartz crystal microbalance (QCM)-D was used to analyze the adsorption quantity of anions on the PVPA surface. The hydratability of the PVPA interface was controlled by changing the anionic properties (the amount of charge and structure), thus regulating the COF. The adsorption difference of anions is an important reasoning of how anionic properties can regulate the hydratability. It was analyzed by molecular dynamics simulation. For anions carrying different numbers of charges or double bonds, the adsorption quantity of anions was mainly affected by the adsorption degree on the PVPA surface, while the adsorption quantity of anions with different molecular configuration was synergistically regulated by the adsorption degree and adsorption area of anions on the PVPA surface. This work can be used to develop smart surfaces for applications.
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Liu M, Zhang C, Chen J, Liu Z, Cheng Y, Wu X. Mechanisms of cation-induced superlubricity transition of poly(vinylphosphonic acid) coatings. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119117] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Cao L, Chen X, Peng Y. The interaction of frothers with hydrophobic and hydrophilic sites of coal particles in NaCl solution. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.11.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Zhao J, Wang D, Zhang F, Liu Y, Chen B, Wang ZL, Pan J, Larsson R, Shi Y. Real-Time and Online Lubricating Oil Condition Monitoring Enabled by Triboelectric Nanogenerator. ACS NANO 2021; 15:11869-11879. [PMID: 34170109 PMCID: PMC8320232 DOI: 10.1021/acsnano.1c02980] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 06/14/2021] [Indexed: 05/21/2023]
Abstract
An intelligent monitoring lubricant is essential for the development of smart machines because unexpected and fatal failures of critical dynamic components in the machines happen every day, threatening the life and health of humans. Inspired by the triboelectric nanogenerators (TENGs) work on water, we present a feasible way to prepare a self-powered triboelectric sensor for real-time monitoring of lubricating oils via the contact electrification process of oil-solid contact (O-S TENG). Typical intruding contaminants in pure base oils can be successfully monitored. The O-S TENG has very good sensitivity, which even can respectively detect at least 1 mg mL-1 debris and 0.01 wt % water contaminants. Furthermore, the real-time monitoring of formulated engine lubricating oil in a real engine oil tank is achieved. Our results show that electron transfer is possible from an oil to solid surface during contact electrification. The electrical output characteristic depends on the screen effect from such as wear debris, deposited carbons, and age-induced organic molecules in oils. Previous work only qualitatively identified that the output ability of liquid can be improved by leaving less liquid adsorbed on the TENG surface, but the adsorption mass and adsorption speed of liquid and its consequences for the output performance were not studied. We quantitatively study the internal relationship between output ability and adsorbing behavior of lubricating oils by quartz crystal microbalance with dissipation (QCM-D) for liquid-solid contact interfaces. This study provides a real-time, online, self-powered strategy for intelligent diagnosis of lubricating oils.
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Affiliation(s)
- Jun Zhao
- Division
of Machine Elements, Luleå University
of Technology, Luleå, SE-971 87 Sweden
- College
of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Di Wang
- Division
of Machine Elements, Luleå University
of Technology, Luleå, SE-971 87 Sweden
| | - Fan Zhang
- Department
of Engineering and Design, School of Engineering and Information, University of Sussex, Brighton, BN1 9RH, United Kingdom
| | - Yuan Liu
- CAS
Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano
Energy and Sensor, Beijing Institute of
Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
| | - Baodong Chen
- CAS
Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano
Energy and Sensor, Beijing Institute of
Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
| | - Zhong Lin Wang
- CAS
Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano
Energy and Sensor, Beijing Institute of
Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
| | - Jinshan Pan
- Division
of Surface and Corrosion Science, Department of Chemistry, KTH Royal Institute of Technology, Stockholm, SE-100 44, Sweden
| | - Roland Larsson
- Division
of Machine Elements, Luleå University
of Technology, Luleå, SE-971 87 Sweden
| | - Yijun Shi
- Division
of Machine Elements, Luleå University
of Technology, Luleå, SE-971 87 Sweden
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Chen P, Lang J, Franklin T, Yu Z, Yang R. Reduced Biofilm Formation at the Air-Liquid-Solid Interface via Introduction of Surfactants. ACS Biomater Sci Eng 2021. [PMID: 33821617 DOI: 10.1021/acsbiomaterials.0c01691] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Reduced biofilm formation is highly desirable in applications ranging from transportation to separations and healthcare. Biofilms often form at the three-phase interface where air, liquid, and solid coexist due to the close proximity to nutrients and oxygen. Reducing biofilm formation at the triple interface presents challenges because of the conflicting requirements for hydrophobicity at the air-solid interface (for self-cleaning properties) and for hydrophilicity at the liquid-solid interface (for reduced foulant adhesion). Meeting those needs simultaneously likely entails a dynamic surface, capable of shifting the surface energy landscape in response to wetting conditions and thus enabling hydrophobicity in air and hydrophilicity in water. Here, we designed a facile approach to render existing surfaces resistant to biofilm formation at the triple interface. By adding trace amounts (∼0.1 mM) of surfactants, biofilm formation of Pseudomonas aeruginosa (known to form biofilm at the triple interface) was reduced on all surfaces tested, ranging from hydrophilic to hydrophobic, polar to nonpolar. That reduced fouling was not a result of the known antimicrobial effects. Instead, it was attributed to the surface-adsorbed surfactants that dynamically control surface energy at the triple interface. To further understand the effect of surfactant-surface interactions on biofilm reduction, we systematically varied the surfactant charge type and surface properties (surface energy and charge). Electrostatic interactions between surfactants and surfaces were identified as an influential factor when predicting the relative fouling reduction upon introduction of surfactants. Nevertheless, biofilm formation was reduced even on the charge-neutral, fluorinated surface made of poly(1H, 1H, 2H, 2H-perfluorodecyl acrylate) by more than 2-fold simply via adding 0.2 mM dodecyl trimethylammonium chloride or 0.3 mM sodium dodecyl sulfate. Given its robustness, this strategy is broadly applicable for reducing fouling on existing surfaces, which in turn improves the cost-effectiveness of membrane separations and mitigates contaminations and nosocomial infections in healthcare.
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Affiliation(s)
- Pengyu Chen
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jiayan Lang
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Trevor Franklin
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Zichen Yu
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Rong Yang
- Smith School of Chemical & Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
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Yen Doan TH, Minh Chu TP, Dinh TD, Nguyen TH, Tu Vo TC, Nguyen NM, Nguyen BH, Nguyen TA, Pham TD. Adsorptive Removal of Rhodamine B Using Novel Adsorbent-Based Surfactant-Modified Alpha Alumina Nanoparticles. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2020; 2020:6676320. [PMID: 33489415 PMCID: PMC7803175 DOI: 10.1155/2020/6676320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/25/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
The objective of the present study is to investigate removal of cationic dye, rhodamine B (RhB), in water environment using a high-performance absorbent based on metal oxide nanomaterials toward green chemistry. The adsorption of sodium dodecyl sulfate (SDS) onto synthesized alpha alumina (α-Al2O3) material (M0) at different ionic strengths under low pH was studied to fabricate a new adsorbent as SDS-modified α-Al2O3 material (M1). The RhB removal using M1 was much higher than M0 under the same experimental conditions. The optimal conditions for RhB removal using M1 were found to be contact time 30 min, pH 4, and adsorbent dosage 5 mg/mL. The maximum RhB removal using M1 achieved 100%, and adsorption amount reached 52.0 mg/g. Adsorption isotherms of RhB onto M1 were well fitted by the two-step adsorption model. The electrostatic attraction between positive RhB molecules and negatively charged M1 surface controlled the adsorption that was evaluated by the surface charge change with zeta potential and adsorption isotherms. Very high RhB removal of greater than 98% after four regenerations of M1 and the maximum removal for all actual textile wastewater samples demonstrate that SDS-modified nano α-Al2O3 is a high-performance and reusable material for RhB removal from wastewater.
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Affiliation(s)
- Thi Hai Yen Doan
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi – 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam
| | - Thi Phuong Minh Chu
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi – 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam
| | - Thi Diu Dinh
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi – 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam
| | - Thi Hang Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi – 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam
- Department of Infrastructure and Urban Environmental Engineering, Hanoi Architectural University, Nguyen Trai, Thanh Xuan, Hanoi 100000, Vietnam
| | - Thi Cam Tu Vo
- HUS High School for Gifted Students, University of Science, Vietnam National University, Hanoi, 182 Luong the Vinh, Thanh Xuan, Hanoi 100000, Vietnam
| | - Nhat Minh Nguyen
- HUS High School for Gifted Students, University of Science, Vietnam National University, Hanoi, 182 Luong the Vinh, Thanh Xuan, Hanoi 100000, Vietnam
| | - Bao Huy Nguyen
- Marie Curie School, Tran van Lai, My Dinh 1, Nam Tu Liem, Hanoi 100000, Vietnam
| | - The An Nguyen
- 499 Tran Khat Chan, Hai Ba Trung, Hanoi 100000, Vietnam
| | - Tien Duc Pham
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi – 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam
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10
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Ketola A, Xiang W, Hjelt T, Pajari H, Tammelin T, Rojas OJ, Ketoja JA. Bubble Attachment to Cellulose and Silica Surfaces of Varied Surface Energies: Wetting Transition and Implications in Foam Forming. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7296-7308. [PMID: 32510965 PMCID: PMC7660937 DOI: 10.1021/acs.langmuir.0c00682] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 06/06/2020] [Indexed: 05/25/2023]
Abstract
To better understand the complex system of wet foams in the presence of cellulosic fibers, we investigate bubble-surface interactions by following the effects of surface hydrophobicity and surface tension on the contact angle of captive bubbles. Bubbles are brought into contact with model silica and cellulose surfaces immersed in solutions of a foaming surfactant (sodium dodecyl sulfate) of different concentrations. It is observed that bubble attachment is controlled by surface wetting, but a significant scatter in the behavior occurs near the transition from partial to complete wetting. For chemically homogeneous silica surfaces, this transition during bubble attachment is described by the balance between the energy changes of the immersed surface and the frictional surface tension of the moving three-phase contact line. The situation is more complex with chemically heterogeneous, hydrophobic trimethylsilyl cellulose (TMSC). TMSC regeneration, which yields hydrophilic cellulose, causes a dramatic drop in the bubble contact angle. Moreover, a high interfacial tension is required to overcome the friction caused by microscopic (hydrophilic) pinning sites of the three-phase contact line during bubble attachment. A simple theoretical framework is introduced to explain our experimental observations.
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Affiliation(s)
- Annika
E. Ketola
- VTT
Technical Research Centre of Finland Ltd., P. O. Box 1603, FI-02150 Espoo, Finland
| | - Wenchao Xiang
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland
| | - Tuomo Hjelt
- VTT
Technical Research Centre of Finland Ltd., P. O. Box 1603, FI-02150 Espoo, Finland
| | - Heikki Pajari
- VTT
Technical Research Centre of Finland Ltd., P. O. Box 1603, FI-02150 Espoo, Finland
| | - Tekla Tammelin
- VTT
Technical Research Centre of Finland Ltd., P. O. Box 1603, FI-02150 Espoo, Finland
| | - Orlando J. Rojas
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Espoo, Finland
- Departments
of Chemical & Biological Engineering, Chemistry, and Wood Science, The University of British Columbia, 2360 East Mall, 2036 Main Mall,
and 2424 Main Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Jukka A. Ketoja
- VTT
Technical Research Centre of Finland Ltd., P. O. Box 1603, FI-02150 Espoo, Finland
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