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Xiaokong Liu - One of the best experts on this subject based on the ideXlab platform.
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substrate independent transparent Oil repellent coatings with self healing and persistent easy sliding Oil Repellency
ACS Nano, 2016Co-Authors: George Y. Chen, Xiaokong LiuAbstract:Herein we report a simple and substrate-independent approach to fabricate transparent Oil-repellent coatings, which involves alternate deposition of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto substrates, followed by incubation of the coated objects into perfluorooctanoate (PFO) aqueous solutions for 2 min. Various low-surface-tension liquids can easily slide down the coating surfaces on flat substrates at a sliding angle lower than 12° for 10 μL droplets. The coatings are applicable to different substrates including Si, glass, plastic, steel, and wood, and those with complex shapes and large surface areas. They are also applicable to rough substrates with roughness at both micro/nanoscale and macroscopic scales to realize the easy-sliding Oil Repellency. Incubation of the PDDA/PSS polyelectrolyte multilayers (PEMs) into PFO solutions induces an effective but nondestructive substitution of PFO anions for PSS in the PEMs, which results in a composite coating with PFO anions h...
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Substrate-Independent, Transparent Oil-Repellent Coatings with Self-Healing and Persistent Easy-Sliding Oil Repellency
2016Co-Authors: George Y. Chen, Xiaokong LiuAbstract:Herein we report a simple and substrate-independent approach to fabricate transparent Oil-repellent coatings, which involves alternate deposition of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto substrates, followed by incubation of the coated objects into perfluorooctanoate (PFO) aqueous solutions for 2 min. Various low-surface-tension liquids can easily slide down the coating surfaces on flat substrates at a sliding angle lower than 12° for 10 μL droplets. The coatings are applicable to different substrates including Si, glass, plastic, steel, and wood, and those with complex shapes and large surface areas. They are also applicable to rough substrates with roughness at both micro/nanoscale and macroscopic scales to realize the easy-sliding Oil Repellency. Incubation of the PDDA/PSS polyelectrolyte multilayers (PEMs) into PFO solutions induces an effective but nondestructive substitution of PFO anions for PSS in the PEMs, which results in a composite coating with PFO anions homogeneously interspersed in both the coating surface and the bulk. Thanks to the as-described “repeating-layer” composition/structure of the coatings, their easy-sliding Oil Repellency can be self-healed after surface decomposition or well maintained after physical damages, due to the replenishing surface. Therefore, the advantageous characteristics of the as-developed Oil-repellent coatings and the simplicity of the preparation protocol make the coatings highly practical for real-world applications. It is believed that the coatings can perform as antismudge coatings that shield against Oil-borne contaminants, chemical-shield coatings that protect coated plastics from dissolution by organic solvents, and nonstick coatings (of Oil tankers or pipelines) that enable loss-free Oil transportation
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cleaning of Oil fouling with water enabled by zwitterionic polyelectrolyte coatings overcoming the imperative challenge of Oil water separation membranes
ACS Nano, 2015Co-Authors: Haoran Duan, Xiaokong Liu, George Y. Chen, Wensheng Yang, Dayang WangAbstract:Herein we report a self-cleaning coating derived from zwitterionic poly(2-methacryloyloxylethyl phosphorylcholine) (PMPC) brushes grafted on a solid substrate. The PMPC surface not only exhibits complete Oil Repellency in a water-wetted state (i.e., underwater superoleophobicity), but also allows effective cleaning of Oil fouled on dry surfaces by water alone. The PMPC surface was compared with typical underwater superoleophobic surfaces realized with the aid of surface roughening by applying hydrophilic nanostructures and those realized by applying smooth hydrophilic polyelectrolyte multilayers. We show that underwater superoleophobicity of a surface is not sufficient to enable water to clean up Oil fouling on a dry surface, because the latter circumstance demands the surface to be able to strongly bond water not only in its pristine state but also in an Oil-wetted state. The PMPC surface is unique with its described self-cleaning performance because the zwitterionic phosphorylcholine groups exhibit exce...
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ion specific Oil Repellency of polyelectrolyte multilayers in water molecular insights into the hydrophilicity of charged surfaces
Angewandte Chemie, 2015Co-Authors: Xiaokong Liu, Chuan Leng, Lauren Joan Brown, Zhan Chen, Jinhan Cho, Dayang WangAbstract:Surface wetting on polyelectrolyte multilayers (PEMs), prepared by alternating deposition of polydiallyldimethylammonium chloride (PDDA) and poly(styrene sulfonate) (PSS), was investigated mainly in water-solid-Oil systems. The surface-wetting behavior of as-prepared PEMs was well correlated to the molecular structures of the uncompensated ionic groups on the PEMs as revealed by sum frequency generation vibrational and X-ray photoelectron spectroscopies. The orientation change of the benzenesulfonate groups on the PSS-capped surfaces causes poor water wetting in Oil or air and negligible Oil wetting in water, while the orientation change of the quaternized pyrrolidine rings on the PDDA-capped surfaces hardly affects their wetting behavior. The underwater Oil Repellency of PSS-capped PEMs was successfully harnessed to manufacture highly efficient filters for Oil-water separation at high flux.
George Y. Chen - One of the best experts on this subject based on the ideXlab platform.
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substrate independent transparent Oil repellent coatings with self healing and persistent easy sliding Oil Repellency
ACS Nano, 2016Co-Authors: George Y. Chen, Xiaokong LiuAbstract:Herein we report a simple and substrate-independent approach to fabricate transparent Oil-repellent coatings, which involves alternate deposition of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto substrates, followed by incubation of the coated objects into perfluorooctanoate (PFO) aqueous solutions for 2 min. Various low-surface-tension liquids can easily slide down the coating surfaces on flat substrates at a sliding angle lower than 12° for 10 μL droplets. The coatings are applicable to different substrates including Si, glass, plastic, steel, and wood, and those with complex shapes and large surface areas. They are also applicable to rough substrates with roughness at both micro/nanoscale and macroscopic scales to realize the easy-sliding Oil Repellency. Incubation of the PDDA/PSS polyelectrolyte multilayers (PEMs) into PFO solutions induces an effective but nondestructive substitution of PFO anions for PSS in the PEMs, which results in a composite coating with PFO anions h...
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Substrate-Independent, Transparent Oil-Repellent Coatings with Self-Healing and Persistent Easy-Sliding Oil Repellency
2016Co-Authors: George Y. Chen, Xiaokong LiuAbstract:Herein we report a simple and substrate-independent approach to fabricate transparent Oil-repellent coatings, which involves alternate deposition of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto substrates, followed by incubation of the coated objects into perfluorooctanoate (PFO) aqueous solutions for 2 min. Various low-surface-tension liquids can easily slide down the coating surfaces on flat substrates at a sliding angle lower than 12° for 10 μL droplets. The coatings are applicable to different substrates including Si, glass, plastic, steel, and wood, and those with complex shapes and large surface areas. They are also applicable to rough substrates with roughness at both micro/nanoscale and macroscopic scales to realize the easy-sliding Oil Repellency. Incubation of the PDDA/PSS polyelectrolyte multilayers (PEMs) into PFO solutions induces an effective but nondestructive substitution of PFO anions for PSS in the PEMs, which results in a composite coating with PFO anions homogeneously interspersed in both the coating surface and the bulk. Thanks to the as-described “repeating-layer” composition/structure of the coatings, their easy-sliding Oil Repellency can be self-healed after surface decomposition or well maintained after physical damages, due to the replenishing surface. Therefore, the advantageous characteristics of the as-developed Oil-repellent coatings and the simplicity of the preparation protocol make the coatings highly practical for real-world applications. It is believed that the coatings can perform as antismudge coatings that shield against Oil-borne contaminants, chemical-shield coatings that protect coated plastics from dissolution by organic solvents, and nonstick coatings (of Oil tankers or pipelines) that enable loss-free Oil transportation
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cleaning of Oil fouling with water enabled by zwitterionic polyelectrolyte coatings overcoming the imperative challenge of Oil water separation membranes
ACS Nano, 2015Co-Authors: Haoran Duan, Xiaokong Liu, George Y. Chen, Wensheng Yang, Dayang WangAbstract:Herein we report a self-cleaning coating derived from zwitterionic poly(2-methacryloyloxylethyl phosphorylcholine) (PMPC) brushes grafted on a solid substrate. The PMPC surface not only exhibits complete Oil Repellency in a water-wetted state (i.e., underwater superoleophobicity), but also allows effective cleaning of Oil fouled on dry surfaces by water alone. The PMPC surface was compared with typical underwater superoleophobic surfaces realized with the aid of surface roughening by applying hydrophilic nanostructures and those realized by applying smooth hydrophilic polyelectrolyte multilayers. We show that underwater superoleophobicity of a surface is not sufficient to enable water to clean up Oil fouling on a dry surface, because the latter circumstance demands the surface to be able to strongly bond water not only in its pristine state but also in an Oil-wetted state. The PMPC surface is unique with its described self-cleaning performance because the zwitterionic phosphorylcholine groups exhibit exce...
Fengling Qing - One of the best experts on this subject based on the ideXlab platform.
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polyhedral oligomeric silsesquioxane based fluoroether containing terpolymers synthesis characterization and their water and Oil Repellency evaluation for cotton fabric
Journal of Polymer Science Part A, 2011Co-Authors: Yu Gao, Fengling QingAbstract:A series of polyhedral oligomeric silsesquioxane (POSS) based hybrid copolymers poly(POSS-co-methyl methacrylate −co- 4-vinylbenzyl fluoroether carboxylate) (P(POSS-MMA-VBFC)) were prepared via radical polymerization and characterized by nuclear magnetic resonance, fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, gel permeation chromatography, X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. The thermal properties of these polymers (Td > 250 °C) were improved by the introduction of POSS cage. The cotton fabrics coated with the polymers possessed excellent water and Oil Repellency. The water and salad Oil contact angle could be achieved from 133° to 159° and from 127° to 141° respectively as the content of POSS in the polymer increased from 0 to 7.1 wt %. Moreover, the cotton fabric coated with the terpolymer was less flammable than the uncoated one. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
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novel water and Oil repellent poss based organic inorganic nanomaterial preparation characterization and application to cotton fabrics
Polymer, 2010Co-Authors: Yu Gao, Fengling Qing, Chuanglong He, Yangen HuangAbstract:Abstract A series of polyhedral oligomeric silsesquioxane (POSS) based hybrid terpolymers P(POSS-MMA-(HFPO)3MA) were synthesized and characterized by NMR, FT-IR, GPC, DSC and TG. The thermal properties of these terpolymers were improved by the introduction of POSS cage. The cotton fabrics coated with these terpolymers possessed excellent water and Oil Repellency. The water and salad Oil contact angle could be achieved from ∼140° to 152° and from ∼127° to 144° respectively as the content of POSS in the terpolymer increased from 6.4 wt% to 13.4 wt%. Compared with P(MMA-(HFPO)3MA) copolymer-coated cotton fabrics, POSS-based terpolymer coated cotton fabrics showed better Oil Repellency with a tendency of first increasing and then decreasing with an increase of the POSS content. The n-hexadecane (surface tension: 27.4 mN/m, 20 °C) contact angle reached ∼117° for coated cotton fabrics with terpolymer containing 9.5 wt% of POSS.
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synthesis and repellent properties of vinylidene fluoride containing polyacrylates
Journal of Fluorine Chemistry, 2007Co-Authors: Jiqing Huang, Weidong Meng, Fengling QingAbstract:Abstract Fluorinated polyacrylats with side group containing vinylidene fluoride (VDF) units (CF 3 (CF 2 ) n (CH 2 CF 2 ) m , n = 3, 5; m = 1, 2) were successfully synthesized. The water and Oil Repellency properties of these polymers are similar to those of fluorinated polyacrylate with side group containing long perfluorooctyl group (CF 3 (CF 2 ) 7 ). The thermal telomerization of CF 3 (CF 2 ) 5 I and CF 3 (CF 2 ) 3 I with vinylidene fluoride (VDF) provided CF 3 (CF 2 ) 5 CH 2 CF 2 I ( 1b ) and CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 I ( 1c ), respectively. The addition of 1b with ethylene followed by hydrolysis gave CF 3 (CF 2 ) 5 CH 2 CF 2 CH 2 CH 2 OH ( 2b ). Treatment of 1c with ethyl vinyl ether in the presence of Na 2 S 2 O 4 followed by reduction produced CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 CH 2 CH 2 OH ( 2c ). Fluoroacrylates 3b – d were prepared by acrylation of the corresponding fluoroalcohols 2b – d . The semi-continuous process emulsion co-polymerization of 3a – d with octadecyl acrylate and 2-hydroxylethyl acrylate initiated by (NH 4 ) 2 S 2 O 8 in the presence of a mixture emulsifiers of polyoxyethylene(10)nonyl phenyl ether (TX-10) and sodium lauryl sulfate provided stable latexes 4a – d , respectively. The water and Oil Repellency properties of 4b (R f : CF 3 (CF 2 ) 5 CH 2 CF 2 ) and 4c (R f : CF 3 (CF 2 ) 3 CH 2 CF 2 CH 2 CF 2 ) containing vinylidene fluoride (VDF) units were similar to those of 4a (R f : CF 3 (CF 2 ) 7 ) containing long perfluoroalkyl group and much better than those of polymer 4d (R f : CF 3 (CF 2 ) 3 ) with short perfluoroalkyl chain. Thus, polyacrylates containing vinylidene fluoride units showed promising aspects as the alternatives to the currently used water and Oil repellent agents with long perfluoroalkyl chains.
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superhydrophobic cotton fabric coating based on a complex layer of silica nanoparticles and perfluorooctylated quaternary ammonium silane coupling agent
Applied Surface Science, 2007Co-Authors: Minghua Yu, Guotuan Gu, Weidong Meng, Fengling QingAbstract:A superhydrophobic complex coating for cotton fabrics based on silica nanoparticles and perfluorooctylated quaternary ammonium silane coupling agent (PFSC) was reported in this article. The complex thin film was prepared through a sol-gel process using cotton fabrics as a substrate. Silica nanoparticles in the coating made the textile surface much rougher, and perfluorooctylated quaternary ammonium silane coupling agent on the top layer of the surface lowered the surface free energy. Textiles coated with this coating showed excellent water repellent property, and water contact angle (CA) increased from 133 degrees on cotton fabrics treated with pure PFSC without silica sol pretreatment up to 145 degrees. The Oil Repellency was also improved and the contact angle of CH2I2, droplet on the fabric surface reached to 131 degrees. In contrast, the contact angle of CH2I2, on the fabric surface treated with pure PFSC was only 125 degrees. (c) 2006 Elsevier B.V. All rights reserved.
Lei Jiang - One of the best experts on this subject based on the ideXlab platform.
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Development of “Liquid-like” Copolymer Nanocoatings for Reactive Oil-Repellent Surface
ACS nano, 2017Co-Authors: Peng Liu, Hengdi Zhang, Jieke Jiang, Meijin Liu, Hongyan Sun, Jiaxi Cui, Lei JiangAbstract:Here, we describe a simple method to prepare Oil-repellent surfaces with inherent reactivity. Liquid-like copolymers with pendant reactive groups are covalently immobilized onto substrates via a sequential layer-by-layer method. The stable and transparent nanocoatings showed Oil Repellency to a broad range of organic liquids even in the presence of reactive sites. Functional molecules could be covalently immobilized onto the Oil-repellent surfaces. Moreover, the liquid Repellency can be maintained or finely tailored after post-chemical modification via synergically tailoring the film thickness, selection of capping molecules, and labeling degree of the capping molecules. Oil-repellent surfaces that are capable of post-functionalization would have technical implications in surface coatings, membrane separation, and biomedical and analytical technologies.
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fish gill inspired crossflow for efficient and continuous collection of spilled Oil
ACS Nano, 2017Co-Authors: Dongliang Tian, Na Zhang, Lei JiangAbstract:Developing an effective system to clean up large-scale Oil spills is of great significance due to their contribution to severe environmental pollution and destruction. Superwetting membranes have been widely studied for Oil/water separation. The separation, however, adopts a gravity-driven approach that is inefficient and discontinuous due to quick fouling of the membrane by Oil. Herein, inspired by the crossflow filtration behavior in fish gills, we propose a crossflow approach via a hydrophilic, tilted gradient membrane for spilled Oil collection. In crossflow collection, as the Oil/water flows parallel to the hydrophilic membrane surface, water is gradually filtered through the pores, while Oil is repelled, transported, and finally collected for storage. Owing to the selective gating behavior of the water-sealed gradient membrane, the large pores at the bottom with high water flux favor fast water filtration, while the small pores at the top with strong Oil Repellency allow easy Oil transportation. In ...
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fish gill inspired crossflow for efficient and continuous collection of spilled Oil
Science & Engineering Faculty, 2017Co-Authors: Dongliang Tian, Na Zhang, Lei JiangAbstract:Developing an effective system to clean up large-scale Oil spills is of great significance due to their contribution to severe environmental pollution and destruction. Superwetting membranes have been widely studied for Oil/water separation. The separation, however, adopts a gravity-driven approach that is inefficient and discontinuous due to quick fouling of the membrane by Oil. Herein, inspired by the crossflow filtration behavior in fish gills, we propose a crossflow approach via a hydrophilic, tilted gradient membrane for spilled Oil collection. In crossflow collection, as the Oil/water flows parallel to the hydrophilic membrane surface, water is gradually filtered through the pores, while Oil is repelled, transported, and finally collected for storage. Owing to the selective gating behavior of the water-sealed gradient membrane, the large pores at the bottom with high water flux favor fast water filtration, while the small pores at the top with strong Oil Repellency allow easy Oil transportation. In addition, the gradient membrane exhibits excellent antifouling properties due to the protection of the water layer. Therefore, this bioinspired crossflow approach enables highly efficient and continuous spilled Oil collection, which is very promising for the cleanup of large-scale Oil spills.
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Fish Gill Inspired Crossflow for Efficient and Continuous Collection of Spilled Oil
2017Co-Authors: Yuhai Dou, Dongliang Tia, Qianna Liu, Na Zhang, Lei Jiang, Jung Ho Kim, Shi Xue DouAbstract:Developing an effective system to clean up large-scale Oil spills is of great significance due to their contribution to severe environmental pollution and destruction. Superwetting membranes have been widely studied for Oil/water separation. The separation, however, adopts a gravity-driven approach that is inefficient and discontinuous due to quick fouling of the membrane by Oil. Herein, inspired by the crossflow filtration behavior in fish gills, we propose a crossflow approach via a hydrophilic, tilted gradient membrane for spilled Oil collection. In crossflow collection, as the Oil/water flows parallel to the hydrophilic membrane surface, water is gradually filtered through the pores, while Oil is repelled, transported, and finally collected for storage. Owing to the selective gating behavior of the water-sealed gradient membrane, the large pores at the bottom with high water flux favor fast water filtration, while the small pores at the top with strong Oil Repellency allow easy Oil transportation. In addition, the gradient membrane exhibits excellent antifouling properties due to the protection of the water layer. Therefore, this bioinspired crossflow approach enables highly efficient and continuous spilled Oil collection, which is very promising for the cleanup of large-scale Oil spills
Hartanti Dwi - One of the best experts on this subject based on the ideXlab platform.
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DAYA REPELAN GEL MINYAK ATSIRI BUNGA KENANGA (Cananga odorata (Lmk) Hook.f & Thoms) DALAM BASIS CARBOPOL, TERHADAP NYAMUK Aedes aegypti
'Lembaga Publikasi Ilmiah dan Penerbitan Universitas Muhammadiyah Purwokerto', 2010Co-Authors: Kurniawati Linda, Hapsari Indri, Hartanti DwiAbstract:ABSTRAK Tujuan penelitian ini adalah untuk mengetahui pengaruh konsentrasi carbopol terhadap sifat fisik gel dan daya repelan gel minyak atsiri bunga kenanga. Minyak atsiri bunga kenanga diperoleh dengan cara penyulingan uap air. Dibuat tiga formula gel minyak atsiri bunga kenanga dengan konsentrasi carbopol yang berbeda (0,5 g, 1,0 g dan 1,5 g). Gel yang dihasilkan dievaluasi sifat fisiknya meliputi uji pH, viskositas, homogenitas, daya sebar, daya lekat dan identifikasi minyak atsiri bunga kenanga. Uji daya repelan dilakukan dengan memasukkan tangan naracoba ke dalam sangkar dengan interval waktu diluar sangkar nyamuk selama 5 menit. Ada lima kelompok yang diujikan, meliputi tangan tanpa intervensi, kontrol negatif berupa tiga formula gel tanpa minyak atsiri bunga kenanga, minyak atsiri bunga kenanga, tiga formula gel minyak atsiri bunga kenanga dan kontrol positif berupa lotion merk “X”. Hasil penelitian menunjukkan bahwa konsentrasi carbopol berbanding terbalik dengan nilai pH dan daya sebar tetapi berbanding lurus dengan daya lekat dan viskositas gel minyak atsiri bunga kenanga. Daya repelan gel minyak atsiri bunga kenanga berbanding lurus dengan konsentrasi carbopol. Kata kunci: daya repelan gel, minyak atsiri bunga kenanga (Cananga odorata (Lmk) Hook.f & Thoms), carbopol, Aedes aegypti ABSTRACT The aim of this research is to know the influence of carbopol concentration to physical characteristic and Repellency of cananga flowers volatile Oil in carbopol gel base. Cananga flowers volatile Oil was extracted by steam water destilation. Three formulas of gel were made by various carbopol concentration (0,5 g, 1,0 g and 1,5 g). The gels produced were tested physical characteristic (organoleptic, pH, viscosity, homogeneity, spread ability, adhesive ability and identification of cananga flowers volatile Oil). Repellency was done by entering hand of person into the cage contain mosquitoes with interval five minute. This research used five groups. They were untreated hand, negative control with three formulas of gel did not used cananga flowers volatile Oil, cananga flowers volatile Oil, three formulas of gel contain cananga flowers volatile Oil and lotion merk “X” as positive control. The result showed that the greater carbopol consentration, the smaller in pH and spread ability but the greater in adhesive ability, viscosity and Repellency of gel from cananga flowers volatile Oil. Key words: Repellency of gel, cananga (Cananga odorata (Lmk) Hook.f & Thoms) flowers volatile Oil, carbopol, Aedes aegypt
