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Uşurelu CD, Frone AN, Oprică GM, Raduly MF, Ghiurea M, Neblea EI, Nicolae CA, Filip X, Teodorescu M, Panaitescu DM. Preparation and functionalization of cellulose nanofibers using a naturally occurring acid and their application in stabilizing linseed oil/water Pickering emulsions. Int J Biol Macromol 2024; 262:129884. [PMID: 38336328 DOI: 10.1016/j.ijbiomac.2024.129884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 01/25/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024]
Abstract
Finding efficient and environmental-friendly methods to produce and chemically modify cellulose nanofibers (CNFs) remains a challenge. In this study, lactic acid (LA) treatment followed by microfluidization was employed for the isolation and functionalization of CNFs. Small amounts of HCl (0.01, 0.1, and 0.2 M) were used alongside LA to intensify cellulose hydrolysis. FTIR spectroscopy and solid-state 13C NMR confirmed the successful functionalization of CNFs with lactyl groups during isolation, while SEM, AFM, and rheological tests revealed that the addition of HCl governed the fibers' sizes and morphology. Notably, the treatment with LA and 0.2 M HCl resulted in a more efficient defibrillation, yielding smaller nanofibers sizes (62 nm) as compared to the treatment with LA or HCl alone (90 and 108 nm, respectively). The aqueous suspension of CNFs treated with LA and 0.2 M HCl showed the highest viscosity and storage modulus. LA-modified CNFs were tested as stabilizers for linseed oil/water (50/50 v/v) emulsions. Owing to the lactyl groups grafted on their surface and higher aspect ratio, CNFs produced with 0.1 and 0.2 M HCl led to emulsions with increased stability (a creaming index increase of only 3 % and 1 %, respectively, in 30 days) and smaller droplets sizes of 23.4 ± 1.2 and 35.5 ± 0.5 μm, respectively. The results showed that LA-modified CNFs are promising stabilizers for Pickering emulsions.
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Affiliation(s)
- Cătălina-Diana Uşurelu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Adriana Nicoleta Frone
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania.
| | - Gabriela-Mădălina Oprică
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania; Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Monica Florentina Raduly
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Marius Ghiurea
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Elena Iulia Neblea
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Cristian-Andi Nicolae
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Xenia Filip
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donath Street, 400293 Cluj-Napoca, Romania
| | - Mircea Teodorescu
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Denis Mihaela Panaitescu
- National Institute for Research and Development in Chemistry and Petrochemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania.
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Je M, Son HB, Han YJ, Jang H, Kim S, Kim D, Kang J, Jeong JH, Hwang C, Song G, Song HK, Ha TS, Park S. Formulating Electron Beam-Induced Covalent Linkages for Stable and High-Energy-Density Silicon Microparticle Anode. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305298. [PMID: 38233196 DOI: 10.1002/advs.202305298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/12/2023] [Indexed: 01/19/2024]
Abstract
High-capacity silicon (Si) materials hold a position at the forefront of advanced lithium-ion batteries. The inherent potential offers considerable advantages for substantially increasing the energy density in batteries, capable of maximizing the benefit by changing the paradigm from nano- to micron-sized Si particles. Nevertheless, intrinsic structural instability remains a significant barrier to its practical application, especially for larger Si particles. Here, a covalently interconnected system is reported employing Si microparticles (5 µm) and a highly elastic gel polymer electrolyte (GPE) through electron beam irradiation. The integrated system mitigates the substantial volumetric expansion of pure Si, enhancing overall stability, while accelerating charge carrier kinetics due to the high ionic conductivity. Through the cost-effective but practical approach of electron beam technology, the resulting 500 mAh-pouch cell showed exceptional stability and high gravimetric/volumetric energy densities of 413 Wh kg-1, 1022 Wh L-1, highlighting the feasibility even in current battery production lines.
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Affiliation(s)
- Minjun Je
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hye Bin Son
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Yu-Jin Han
- Ulsan Advanced Energy Technology R&D Center, Korea Institute of Energy Research (KIER), Ulsan, 44776, Republic of Korea
| | - Hangeol Jang
- Ulsan Advanced Energy Technology R&D Center, Korea Institute of Energy Research (KIER), Ulsan, 44776, Republic of Korea
- School of Materials Science and Engineering, Pusan National University, Busan, 46241, Republic of Korea
| | - Sungho Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Dongjoo Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Jieun Kang
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | | | - Chihyun Hwang
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea
- Advanced Batteries Research Center, Korea Electronics Technology Institute (KETI), Gyeonggi-do, 13509, Republic of Korea
| | - Gyujin Song
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
- Ulsan Advanced Energy Technology R&D Center, Korea Institute of Energy Research (KIER), Ulsan, 44776, Republic of Korea
| | - Hyun-Kon Song
- School of Energy and Chemical Engineering, Ulsan National Institute of Science & Technology (UNIST), Ulsan, 44919, Republic of Korea
| | | | - Soojin Park
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
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He Q, Xu Y, Zhang F, Jia Y, Du Z, Li G, Shi B, Li P, Ning M, Li A. Preparation methods and research progress of super-hydrophobic anti-icing surface. Adv Colloid Interface Sci 2024; 323:103069. [PMID: 38128377 DOI: 10.1016/j.cis.2023.103069] [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: 07/10/2023] [Revised: 09/11/2023] [Accepted: 12/04/2023] [Indexed: 12/23/2023]
Abstract
The problem of surface icing poses a serious threat to people's economy and safety, especially in the fields of aerospace, wind power generation and circuit transmission. Super-hydrophobic has excellent anti-icing performance, so it has been widely studied. As the most promising anti-icing technology, superhydrophobic anti-icing surface should not only be simple to prepare, but also have excellent comprehensive performance, which can meet the anti-icing task under harsh working conditions and long-term durability. This paper summarizes the basic performance requirements of superhydrophobic surface for anti-icing operation, and then summarizes the preparation methods and existing problems of superhydrophobic surface in recent years. Finally, the future development trend of superhydrophobic anti-icing surface is prospected and discussed, hoping to provide certain technical guidance for the subsequent research of high-performance superhydrophobic anti-icing surface.
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Affiliation(s)
- Qiang He
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China; Henan Joint International Research Laboratory of man machine environment and emergency management, Henan, Anyang 455000, China.
| | - Yuan Xu
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Fangyuan Zhang
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Yangyang Jia
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China
| | - Zhicai Du
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Guotao Li
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China
| | - Binghong Shi
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Peiwen Li
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Mengyao Ning
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China; College of Mechanical and Electrical Engineering, Gansu Agricultural University, Gansu, Lanzhou 730070, China
| | - Anling Li
- College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan 618307, China.
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Fliri L, Heise K, Koso T, Todorov AR, Del Cerro DR, Hietala S, Fiskari J, Kilpeläinen I, Hummel M, King AWT. Solution-state nuclear magnetic resonance spectroscopy of crystalline cellulosic materials using a direct dissolution ionic liquid electrolyte. Nat Protoc 2023:10.1038/s41596-023-00832-9. [PMID: 37237027 DOI: 10.1038/s41596-023-00832-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 03/17/2023] [Indexed: 05/28/2023]
Abstract
Owing to its high sustainable production capacity, cellulose represents a valuable feedstock for the development of more sustainable alternatives to currently used fossil fuel-based materials. Chemical analysis of cellulose remains challenging, and analytical techniques have not advanced as fast as the development of the proposed materials science applications. Crystalline cellulosic materials are insoluble in most solvents, which restricts direct analytical techniques to lower-resolution solid-state spectroscopy, destructive indirect procedures or to 'old-school' derivatization protocols. While investigating their use for biomass valorization, tetralkylphosphonium ionic liquids (ILs) exhibited advantageous properties for direct solution-state nuclear magnetic resonance (NMR) analysis of crystalline cellulose. After screening and optimization, the IL tetra-n-butylphosphonium acetate [P4444][OAc], diluted with dimethyl sulfoxide-d6, was found to be the most promising partly deuterated solvent system for high-resolution solution-state NMR. The solvent system has been used for the measurement of both 1D and 2D experiments for a wide substrate scope, with excellent spectral quality and signal-to-noise, all with modest collection times. The procedure initially describes the scalable syntheses of an IL, in 24-72 h, of sufficient purity, yielding a stock electrolyte solution. The dissolution of cellulosic materials and preparation of NMR samples is presented, with pretreatment, concentration and dissolution time recommendations for different sample types. Also included is a set of recommended 1D and 2D NMR experiments with parameters optimized for an in-depth structural characterization of cellulosic materials. The time required for full characterization varies between a few hours and several days.
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Affiliation(s)
- Lukas Fliri
- Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland
| | - Katja Heise
- Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland
| | - Tetyana Koso
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Aleksandar R Todorov
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Daniel Rico Del Cerro
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Sami Hietala
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Juha Fiskari
- Fibre Science and Communication Network (FSCN), Mid Sweden University, Sundsvall, Sweden
| | - Ilkka Kilpeläinen
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Michael Hummel
- Department of Bioproducts and Biosystems, Aalto University, Espoo, Finland.
| | - Alistair W T King
- Materials Chemistry Division, Department of Chemistry, University of Helsinki, Helsinki, Finland.
- VTT Technical Research Centre of Finland Ltd, Espoo, Finland.
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5
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Preparation of superhydrophobic conductive CNT/PDMS film on paper by foam spraying method. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129327] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Liu S, Chen K, Salim A, Li J, Bottone D, Seeger S. Printable and Versatile Superhydrophobic Paper via Scalable Nonsolvent Armor Strategy. ACS NANO 2022; 16:9442-9451. [PMID: 35611949 PMCID: PMC9245351 DOI: 10.1021/acsnano.2c02382] [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: 03/09/2022] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
Despite great scientific and industrial interest in waterproof cellulosic paper, its real world application is hindered by complicated and costly fabrication processes, limitations in scale-up production, and use of organic solvents. Furthermore, simultaneously achieving nonwetting properties and printability on paper surfaces still remains a technical and chemical challenge. Herein, we demonstrate a nonsolvent strategy for scalable and fast fabrication of waterproofing paper through in situ surface engineering with polysilsesquioxane nanorods (PSNRs). Excellent superhydrophobicity is attained on the functionalized paper surface with a water contact angle greater than 160°. Notably, the engineered paper features outstanding printability and writability, as well as greatly enhanced strength and integrity upon prolonged exposure to water (tensile strength ≈ 9.0 MPa). Additionally, the PSNRs concurrently armor paper-based printed items and artwork with waterproofing, self-cleaning, and antimicrobial functionalities without compromising their appearance, readability, and mechanical properties. We also demonstrate that the engineered paper holds the additional advantages of easy processing, low cost, and mechanochemical robustness, which makes it particularly promising for real world applications.
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8
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Li X, Liu J, Guo Q, Zhang X, Tian M. Polymerizable Deep Eutectic Solvent-Based Skin-Like Elastomers with Dynamic Schemochrome and Self-Healing Ability. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2201012. [PMID: 35403800 DOI: 10.1002/smll.202201012] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/14/2022] [Indexed: 06/14/2023]
Abstract
Animal skin is a huge source of inspiration when it comes to multifunctional sensing materials. Bioinspired sensors integrated with the intriguing performance of skin-like steady wide-range strain detection, real-time dynamic visual cues, and self-healing ability hold great promise for next-generation electronic skin materials. Here, inspired by the skins of a chameleon, cellulose nanocrystals (CNCs) liquid crystal skeleton is embedded into polymerizable deep eutectic solvent (PDES) via in situ polymerization to develop a skin-like elastomer. Benefiting from the elastic ionic conductive PDES matrix and dynamic interfacial hydrogen bonding, this strategy has broken through the limitations that CNCs-based cholesteric structure is fragile and its helical pitch is non-adjustable, endowing the resulting elastomer with strain-induced wide-range (0-500%) dynamic structural colors and excellent self-healing ability (78.9-90.7%). Furthermore, the resulting materials exhibit high stretch-ability (1163.7%), strain-sensing and self-adhesive abilities, which make them well-suitable for developing widely applicable and highly reliable flexible sensors. The proposed approach of constructing biomimetic skin-like materials with wide-range dynamic schemochrome is expected to extend new possibilities in diverse applications including anti-counterfeit labels, soft foldable displays, and wearable optical devices.
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Affiliation(s)
- Xinkai Li
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Jize Liu
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Quanquan Guo
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01069, Dresden, Germany
| | - Xinxing Zhang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China
| | - Ming Tian
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China
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He Z, Wu H, Shi Z, Kong Z, Ma S, Sun Y, Liu X. Facile Preparation of Robust Superhydrophobic/Superoleophilic TiO 2-Decorated Polyvinyl Alcohol Sponge for Efficient Oil/Water Separation. ACS OMEGA 2022; 7:7084-7095. [PMID: 35252699 PMCID: PMC8892669 DOI: 10.1021/acsomega.1c06775] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/04/2022] [Indexed: 06/14/2023]
Abstract
Oily wastewater and oil spills pose a threat to the environment and human health, and porous sponge materials are highly desired for oil/water separation. Herein, we design a new superhydrophobic/superoleophilic TiO2-decorated polyvinyl alcohol (PVA) sponge material for efficient oil/water separation. The TiO2-PVA sponge is obtained by firmly anchoring TiO2 nanoparticles onto the skeleton surface of pristine PVA sponge via the cross-linking reactions between TiO2 nanoparticles and H3BO3 and KH550, followed by the chemical modification of 1H,1H,2H,2H-perfluorodecyltrichlorosilane. The as-prepared TiO2-PVA sponge shows a high water contact angle of 157° (a sliding angle of 5.5°) and an oil contact angle of ∼0°, showing excellent superhydrophobicity and superoleophilicity. The TiO2-PVA sponge exhibits excellent chemical stability, thermal stability, and mechanical durability in terms of immersing it in the corrosive solutions and solvents, boiling it in water, and the sandpaper abrasion test. Moreover, the as-prepared TiO2-PVA sponge possesses excellent absorption capacity of oils or organic solvents ranging from 4.3 to 13.6 times its own weight. More importantly, the as-prepared TiO2-PVA sponge can separate carbon tetrachloride from the oil-water mixture with a separation efficiency of 97.8% with the aid of gravity and maintains a separation efficiency of 96.5% even after 15 cyclic oil/water separation processes. Therefore, the rationally designed superhydrophobic/superoleophilic TiO2-PVA sponge shows great potential in practical applications of dealing with oily wastewater and oil spills.
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Affiliation(s)
- Zhiwei He
- Center
for Advanced Optoelectronic Materials, Anti-Icing Materials (AIM)
Laboratory, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Hanqing Wu
- School
of Mechanical Engineering, Hangzhou Dianzi
University, Hangzhou 310018, China
| | - Zhen Shi
- Institute
of Advanced Magnetic Materials, College of Materials and Environmental
Engineering, Hangzhou Dianzi University, Hangzhou 310012, China
| | - Zhe Kong
- Center
for Advanced Optoelectronic Materials, Anti-Icing Materials (AIM)
Laboratory, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Shiyu Ma
- Center
for Advanced Optoelectronic Materials, Anti-Icing Materials (AIM)
Laboratory, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Yuping Sun
- Center
for Advanced Optoelectronic Materials, Anti-Icing Materials (AIM)
Laboratory, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Xianguo Liu
- Institute
of Advanced Magnetic Materials, College of Materials and Environmental
Engineering, Hangzhou Dianzi University, Hangzhou 310012, China
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Partl GJ, Naier BFE, Bakry R, Schlapp-Hackl I, Kopacka H, Wurst K, Gelbrich T, Fliri L, Schottenberger H. Can't touch this: Highly omniphobic coatings based on self-textured C6-fluoroponytailed polyvinylimidazolium monoliths. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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12
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Waterproof-breathable films from multi-branched fluorinated cellulose esters. Carbohydr Polym 2021; 271:118031. [PMID: 34364545 DOI: 10.1016/j.carbpol.2021.118031] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 03/11/2021] [Accepted: 03/30/2021] [Indexed: 11/20/2022]
Abstract
Cellulose ester films were prepared by esterification of cellulose with a multibranched fluorinated carboxylic acid, "BRFA" (BRanched Fluorinated Acid), at different anhydroglucose unit:BRFA molar ratios (i.e., 1:0, 10:1, 5:1, and 1:1). Morphological and optical analyses showed that cellulose-BRFA materials at molar ratios 10:1 and 5:1 formed flat and transparent films, while the one at 1:1 M ratio formed rough and translucent films. Degrees of substitution (DS) of 0.06, 0.09, and 0.23 were calculated by NMR for the samples at molar ratios 10:1, 5:1, and 1:1, respectively. ATR-FTIR spectroscopy confirmed the esterification. DSC thermograms showed a single glass transition, typical of amorphous polymers, at -11 °C. The presence of BRFA groups shifted the mechanical behavior from rigid to ductile and soft with increasing DS. Wettability was similar to standard fluoropolymers such as PTFE and PVDF. Finally, breathability and water uptake were characterized and found comparable to materials typically used in textiles.
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Surface engineering of cellulose film with myristic acid for high strength, self-cleaning and biodegradable packaging materials. Carbohydr Polym 2021; 269:118315. [PMID: 34294329 DOI: 10.1016/j.carbpol.2021.118315] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/03/2021] [Accepted: 06/04/2021] [Indexed: 11/24/2022]
Abstract
Developing sustainable, renewable, hydrophobic, and biodegradable packaging material to replace petroleum-based plastic products remains a challenge. Herein, original cellulose/myristic acid composite films were fabricated by solvent-vaporized controllable crystallization of natural myristic acid on anisotropic cellulose films. The myristic acid crystals that evenly distributed on the surface of cellulose film generated micronano binary structure and the interstitial space between microplates, resulting in high hydrophobicity (water contact angle = 132°) and excellent self-cleaning property of the composite film. The resultant film exhibited good tensile strength and toughness under both dry (188.7 MPa, 34.4 MJ m-3) and humid conditions (119.9 MPa, 28.7 MJ m-3). Moreover, these composite films could be degraded completely after approximately 102 days in soil with an average environment temperature of 32 °C. This work provided a low-cost and sustainable pathway for the fabrication of high-strength, self-cleaning, and waterproof packaging materials instead of plastics.
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Sun C, Zhu D, Jia H, Yang C, Zheng Z, Wang X. Bio-based visual optical pressure-responsive sensor. Carbohydr Polym 2021; 260:117823. [PMID: 33712164 DOI: 10.1016/j.carbpol.2021.117823] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 01/26/2021] [Accepted: 02/12/2021] [Indexed: 11/25/2022]
Abstract
A bio-based pressure-responsive sensor with adjustable structural color is prepared by combining aerogel skeleton of cellulose nanocrystals (CNCs)/poly(ethylene glycol) (PEG) obtained via the ice-templating method with flexible polyacrylamide (PAAM) elastomer. The white aerogel is composed of consecutive ribbons, demonstrating chiral nematic structure. These ribbons are rearranged to be vertical to the force direction, leading to immediate appearance of the structural color when the 3D aerogel transforms to a 2D plane. Helical pitches are regulated by the PEG content that the wavelength of structural color covers up to 178 nm. There is an excellent linear correlation between pressure and transmittance of reflectance peak, and the sensitivity to pressure can be regulated by changing solid content of PAAM. Furthermore, the pressure-responsive color is still vivid after 16 cycles of compression. This flexible material with pressure-responsive structural color is promising in sensing, intelligent display, information transmission, and etc.
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Affiliation(s)
- Chengyuan Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Dandan Zhu
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Haiyan Jia
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Chongchong Yang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Zhen Zheng
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Xinling Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
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Zhu Z, Fu S, Lavoine N, Lucia LA. Structural reconstruction strategies for the design of cellulose nanomaterials and aligned wood cellulose-based functional materials – A review. Carbohydr Polym 2020; 247:116722. [DOI: 10.1016/j.carbpol.2020.116722] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/30/2020] [Accepted: 06/30/2020] [Indexed: 11/29/2022]
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16
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Ma X, He L, Huang S, Wu Y, Pan A, Liang J. Effect of different molecular architectured POSS-fluoropolymers on their self-assembled hydrophobic coatings. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04739-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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17
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Teng Y, Wang Y, Shi B, Fan W, Li Z, Chen Y. Facile fabrication of superhydrophobic paper with durability, chemical stability and self-cleaning by roll coating with modified nano-TiO2. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01518-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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18
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Sun C, Zhu D, Jia H, Yang C, Zheng Z, Wang X. Bioinspired Hydrophobic Cellulose Nanocrystal Composite Films as Organic-Solvent-Responsive Structural-Color Rewritable Papers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26455-26463. [PMID: 32419444 DOI: 10.1021/acsami.0c04785] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lots of beetles, moths, and birds in the natural world present stunning unique structural colors as well as excellent hydrophobic performances. Herein, a novel bioinspired variable structural-color film with organic-solvent responsiveness and surface hydrophobicity was fabricated. Cellulose nanocrystals (CNCs) provided structural color with left-handed helicity. PEG-PPG-PEG triblock copolymers (PPPTCs) were blended with CNCs, giving rise to the organic-solvent-responsive structural color and wider red-shift window of the reflectance peak. The color of the film could be regulated repeatedly under the stimulus of cyclohexanone with an obvious red shift up to 107 nm, corresponding to a macroscopic color change from blue to yellow. Low-surface-energy compound hexadecyltrimethoxysilane (HDTMS) was covalently grafted on the surface in a one-step method to introduce hydrophobicity, successfully preventing the effect of water on the ordered nanostructure. Based on the bionics principle, the as-prepared CNC/PPPTC nanocomposite films with variable structural colors and hydrophobicity are beneficial to their prospective applications in display screens, rewritable hydrophobic structural-color-changing paper, biomimetic sensors, and so forth.
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Affiliation(s)
- Chengyuan Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Dandan Zhu
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Haiyan Jia
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Chongchong Yang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Zhen Zheng
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Xinling Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
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19
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Mesko MF, Balbinot FP, Scaglioni PT, Nascimento MS, Picoloto RS, da Costa VC. Determination of halogens and sulfur in honey: a green analytical method using a single analysis. Anal Bioanal Chem 2020; 412:6475-6484. [PMID: 32394040 DOI: 10.1007/s00216-020-02636-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/24/2020] [Accepted: 04/01/2020] [Indexed: 12/26/2022]
Abstract
The halogen determination is important in view of their biological and environmental roles, but their determination has still been considered a challenge, especially at low concentrations. Therefore, a method for honey decomposition using microwave-induced combustion (MIC) combined with ion chromatography and conductimetric detection (for Cl, F, and S determination) or mass detection (for Br and I determination) (IC-CD-MS) is proposed. Trueness was evaluated by adding reference materials (RMs) or a standard solution in the sample. By using 50 mmol L-1 NH4OH as the absorbing solution, recoveries for all analytes were between 94 and 103%, in both tests. Moreover, no statistical difference (t test, confidence level of 95%) was observed for the results obtained by IC in comparison with those obtained by inductively coupled plasma optical emission spectroscopy (Cl and S) and by inductively coupled plasma mass spectrometry (Br and I). Finally, the proposed method was applied to 19 honey samples from different origins. The concentrations ranged from < 0.45 to 2.39 mg kg-1 (Br), 21.8 to 671 mg kg-1 (Cl), and 11 to 154 mg kg-1 (S), while the F and I concentrations were below that their quantification limits (LOQs) in all analyzed samples. The LOQs for Br, Cl, F, I, and S were 0.45, 21, 3.7, 0.077, and 8.7 mg kg-1, respectively. The MIC method provided a compatible solution to IC for the halogen and S determination in honey by a single analysis. Graphical abstract.
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Affiliation(s)
- Marcia F Mesko
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil.
| | - Fernanda P Balbinot
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
| | - Priscila T Scaglioni
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
| | - Mariele S Nascimento
- Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Rochele S Picoloto
- Departamento de Química, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil
| | - Vanize C da Costa
- Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Capão do Leão, RS, 96160-000, Brazil
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20
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Jiao Z, Chu W, Liu L, Mu Z, Li B, Wang Z, Liao Z, Wang Y, Xue H, Niu S, Jiang S, Han Z, Ren L. Underwater writable and heat-insulated paper with robust fluorine-free superhydrophobic coatings. NANOSCALE 2020; 12:8536-8545. [PMID: 32242573 DOI: 10.1039/c9nr10612j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Since its invention invented in China, paper has been widely used in the world for quite a long time. However, some intrinsic defects servely hinder its application in some extreme conditions, such as underwater or in fire. Herein, a bio-inspired durable paper with robust fluorine-free coatings was fabricated via a two-step spray-deposition technique. It not only consisted of modified SiO2 microspheres and nanoparticles, but also contained an epoxy resin, endowing the paper with multifunctional properties. First, this bio-inspired functional paper showed excellent superhydrophobic and self-cleaning properties with a high static water contact angle (WCA) of 162.7 ± 0.5° and a low sliding angle (SA) of 5.7 ± 0.6°. Moreover, it possessed unusual repellent properties toward multiple aqueous-based liquids and heat-insulated properties. Second, this paper could be used for writing underwater and maintained satisfactory superhydrophobic performance for a long time with a WCA of 153.3 ± 1.8°. Besides, its high mechanical robustness was also experimentally confirmed in harsh working conditions, such as strong acid/alkali, boiling water, abrasion, bending, and folding. Compared with conventional paper, it is anticipated that this bio-inspired functional paper would be really competitive and demonstrate great potential in the field of underwater and fire-proof applications.
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Affiliation(s)
- Zhibin Jiao
- Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China.
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21
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Liu G, Wang J, Wang W, Yu D. A novel PET fabric with durable anti-fouling performance for reusable and efficient oil-water separation. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123941] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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22
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Enhanced colour, hydrophobicity, UV radiation absorption and antistatic properties of wool fabric multi-functionalised with silver nanoparticles. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123819] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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23
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Ren F, Guo H, Guo ZZ, Jin YL, Duan HJ, Ren PG, Yan DX. Highly Bendable and Durable Waterproof Paper for Ultra-High Electromagnetic Interference Shielding. Polymers (Basel) 2019; 11:E1486. [PMID: 31547358 PMCID: PMC6780577 DOI: 10.3390/polym11091486] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/02/2019] [Accepted: 09/09/2019] [Indexed: 11/16/2022] Open
Abstract
An efficient electromagnetic interference (EMI) shielding paper with excellent water repellency and mechanical flexibility has been developed, by assembling silver nanowires (AgNWs) and hydrophobic inorganic ceramic on the cellulose paper, via a facile dip-coating preparation. Scanning electron microscope (SEM) observations confirmed that AgNWs were interconnected and densely coated on both sides of the cellulose fiber, which endows the as-prepared paper with high conductivity (33.69 S/cm in-plane direction) at a low AgNW area density of 0.13 mg/cm2. Owing to multiple reflections and scattering between the two outer highly conductive surfaces, the obtained composite presented a high EMI shielding effectiveness (EMI SE) of up to 46 dB against the X band, and ultrahigh specific EMI SE of 271.2 dB mm-1. Moreover, the prepared hydrophobic AgNW/cellulose (H-AgNW/cellulose) composite paper could also maintain high EMI SE and extraordinary waterproofness (water contact angle > 140°) by suffering dozens of bending tests or one thousand peeling tests. Overall, such a multifunctional paper might have practical applications in packaging conductive components and can be used as EMI shielding elements in advanced application areas, even under harsh conditions.
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Affiliation(s)
- Fang Ren
- The Faculty of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Han Guo
- The Faculty of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Zheng-Zheng Guo
- The Faculty of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Yan-Ling Jin
- The Faculty of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an 710048, China
| | - Hong-Ji Duan
- Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China
| | - Peng-Gang Ren
- The Faculty of Printing and Packaging Engineering, Xi'an University of Technology, Xi'an 710048, China.
- Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China.
| | - Ding-Xiang Yan
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
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24
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Wang Q, Xiong J, Chen G, Xinping O, Yu Z, Chen Q, Yu M. Facile Approach to Develop Hierarchical Roughness fiber@SiO 2 Blocks for Superhydrophobic Paper. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E1393. [PMID: 31035671 PMCID: PMC6539994 DOI: 10.3390/ma12091393] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 11/16/2022]
Abstract
Papers with nanoscaled surface roughness and hydrophobically modification have been widely used in daily life. However, the relatively complex preparation process, high costs and harmful compounds have largely limited their applications. This research aims to fabricate superhydrophobic papers with low cost and nontoxic materials. The surface of cellulose fibers was initially coated with a film of SiO2 nanoparticles via sol-gel process. After papermaking and subsequent modification with hexadecyltrimethoxysilane through a simple solution-immersion process, the paper showed excellent superhydrophobic properties, with water contact angles (WCA) larger than 150°. Moreover, the prepared paper also showed superior mechanical durability against 10 times of deformation. The whole preparation process was carried out in a mild environment, with no intricate instruments or toxic chemicals, which has the potential of large-scale industrial production and application.
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Affiliation(s)
- Qing Wang
- YUTO Research Institute, Shenzhen YUTO Packaging Technology Co., Ltd., Shenzhen 518000, China.
| | - Jieyi Xiong
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Guangxue Chen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Ouyang Xinping
- School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Zhaohui Yu
- YUTO Research Institute, Shenzhen YUTO Packaging Technology Co., Ltd., Shenzhen 518000, China.
| | - Qifeng Chen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Mingguang Yu
- School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China.
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25
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Torun I, Celik N, Hancer M, Es F, Emir C, Turan R, Onses MS. Water Impact Resistant and Antireflective Superhydrophobic Surfaces Fabricated by Spray Coating of Nanoparticles: Interface Engineering via End-Grafted Polymers. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01808] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Ilker Torun
- Department of Materials Science and Engineering, Nanotechnology Research Center (ERNAM) Erciyes University, Kayseri 38039, Turkey
| | - Nusret Celik
- Department of Materials Science and Engineering, Nanotechnology Research Center (ERNAM) Erciyes University, Kayseri 38039, Turkey
| | - Mehmet Hancer
- Department of Metallurgical and Materials Engineering, Muğla Sıtkı Koçman University, Muğla 48000, Turkey
| | - Fırat Es
- Center for Solar Cell Research and Applications (GUNAM), Department of Physics, Middle East Technical University, 06800 Ankara, Turkey
| | - Cansu Emir
- iTechSolar, Middle East Technical University Technopark, 06800 Ankara, Turkey
| | - Raşit Turan
- Center for Solar Cell Research and Applications (GUNAM), Department of Physics, Middle East Technical University, 06800 Ankara, Turkey
| | - M. Serdar Onses
- Department of Materials Science and Engineering, Nanotechnology Research Center (ERNAM) Erciyes University, Kayseri 38039, Turkey
- UNAM − Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey
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26
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Hosseinpourpia R, Adamopoulos S, Parsland C. Utilization of different tall oils for improving the water resistance of cellulosic fibers. J Appl Polym Sci 2018. [DOI: 10.1002/app.47303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Reza Hosseinpourpia
- Department of Forestry and Wood Technology; Linnaeus University; Lückligs Plats 1, 35195, Växjö Sweden
| | - Stergios Adamopoulos
- Department of Forestry and Wood Technology; Linnaeus University; Lückligs Plats 1, 35195, Växjö Sweden
| | - Charlotte Parsland
- Department of Built Environment and Energy Technology; Linnaeus University; Lückligs Plats 1, 35195, Växjö Sweden
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27
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Rosu C, Jang Y, Jiang L, Champion J. Nature-Inspired and "Water-Skating" Paper and Polyester Substrates Enabled by the Molecular Structure of Poly(γ-stearyl-α,l-glutamate) Homopolypeptide. Biomacromolecules 2018; 19:4617-4628. [PMID: 30444119 DOI: 10.1021/acs.biomac.8b01312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We demonstrate that the molecular structure of a synthetic homopolypeptide that resembles the leg architecture of water strider insects is effective to impart flexible polymeric surfaces with superhydrophobic behavior. Filter paper (FP) and polyester (PET) were modified with a coating consisting of low-molecular weight α-helical poly(γ-stearyl-α,l-glutamate) (PSLG, Mw = 4500 Da) homopolypeptide. PSLG-coated substrates displayed near to and superhydrophobic behavior (≥150°) as reflected by the contact angle values. Despite being physically adsorbed, the PSLG coating uniformly covered and was strongly adhered to the substrate surfaces. The thin coating layer displayed remarkable mechanical abrasion resistance and was insensitive to long-time exposure to ambient conditions. PLSG-coated textile fibers exhibited useful and interesting properties. Under an iron-containing load, PSLG-coated PET was able to float and "walk" on water when exposed to a magnet. The PSLG coating was able to reduce the adhesion of Escherichia coli, model Gram-negative bacteria. The results indicated that the molecular geometry of PSLG homopolypeptide, which possesses a α-helical backbone sprouting out of highly hydrophobic stearyl side chains, was the key feature responsible for the observed behaviors. This study is relevant for a broad range of potential applications: from crop and drinking water management in arid geographic areas to biomedical devices and implants.
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Affiliation(s)
- Cornelia Rosu
- School of Chemical and Biomolecular Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.,Georgia Tech Polymer Network, GTPN , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Yeongseon Jang
- School of Chemical and Biomolecular Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Lu Jiang
- School of Chemical and Biomolecular Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.,Renewable Bioproducts Institute , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Julie Champion
- School of Chemical and Biomolecular Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
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