COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 9
·1459-1468
·
IF 1.931
Guan Peiwen,Ren Cong,Shan Houchao,Cai Di,Zhao Peimian,Ma Dongze,Qin Peiyong,Li Shufeng,Si Zhihao
To meet the increasing requirements toward biobutanol, pervaporation membrane with high separation performance needs to be developed. In this work, a hydrophobic MAF-6 (RHO-[Zn(eim) 2 ]) was synthesized and its adsorption properties for 1-butanol was systematically studied, which are supposed to benefit the separation performance of polydimethylsiloxane (PDMS) membrane. The hydrophobic MAF-6 particles were therefore doped into PDMS to fabricate mixed matrix membrane. The morphology, chemical structure, and other properties of particles and hybrid membrane were fully studied by SEM, PXRD, FT-IR, TGA, and BET. Results demonstrate that the hydrophobicity of PDMS membrane is improved with the water contact angle increasing from 112.7° to 118.1° after being doped with MAF-6, as well as enhanced adsorption ability toward 1-butanol. More importantly, when doping MAF-6 into PDMS layer, the enhancements of 23.30% and 41.93% are separately observed in the separation factor and total flux to separate 1.5 wt% 1-butanol solution, compared with the PDMS membrane. In addition, the heat energy consumption of pervaporation process is decreased from 4.27 to 3.71 kJ g −1 via the doping of MAF-6. Overall, this work confirms that the hydrophobic particle such as MAF-6 is not only conductive to enhance the separation performance of PDMS membrane but also helpful to decrease the energy consumption.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zhuohan Chen,Xiaojing Su,Wenjian Wu,Siting Chen,Xiaofan Zhang,Yunhui Wu,Huali Xie,Kunquan Li
Natural wood, with its unique porous structure, has been widely modified for separating oil-water mixtures. However, the separation efficiency is often unsatisfactory, and little attention is focused on mitigating secondary pollution after its usable lifespan. Here, a superhydrophobic material consisting of delignified wood coated with titanium dioxide (TiO 2 ) and polydimethylsiloxane (PDMS) was prepared. The resulting PDMS@TiO 2 wood possessed outstanding superhydrophobicity, with a water contact angle of 160 o . Owing to its longitudinal channels and excellent water repellency, the wood was successfully used to separate oil-water mixtures, with a high permeation flux of up to 6111 L·m −2 ·h −1 and separation efficiency of up to 93.4%. Importantly, PDMS and other oil pollutants were capable of being largely degraded after use via photocatalysis of the TiO 2 layer, and the degradation reached 8.56 wt% within 30 days. The results from this study provide a method for fabricating functional superhydrophobic wood with photocatalytic degradation ability for efficient oily wastewater treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 5
·1133-1141
·
IF 1.385
Xu Feigao,Liu Heng,Li Dan
Xerogels’ formation in the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) was studied by varying pH through adopting three different type basic catalysts (n-octylamine, dodecylamine and tetradecylamine), respectively. The effect of different templates to the formation of xerogels was investigated and characterized by FTIR, N 2 physisorption, TG-DSC and SEM analysis. The results showed that the morphology and textural characteristics of the xerogels prepared in three kinds of organic amine solutions were quite different. The texture of xerogels became more compact after addition of hydroxyl-terminated polydimethylsiloxane (PDMS-OH). Comparing with dodecylamine and tetradecylamine, n-octylamine is more suitable as catalyst to TEOS/PDMS for stone consolidation.
研究领域:
材料科学
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文物保护
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Linlin Yu,Ruoyu Chen,Qian Jia
Oily wastewater, especially oil-water emulsions, has caused severe environmental damage. It is urgent to develop a simple, efficient superhydrophobic and superoleophilic material to address this issue. In this work, a multifunctional sponge based on MOF was proposed. The hydroxy-assisted method was employed to prepare MOF-5 with metal coordination centers. Subsequently, octadecylphosphonic acid (OPA) was used to hydrophobically modify MOF-5 to prepare stable and hydrophobic OPA-MOF-5. Polydimethylsiloxane (PDMS) with low surface energy was employed as the adhesive, and the hydrophobic OPA-MOF-5 was loaded onto the polyurethane (PU) sponge to obtain the stable superhydrophobic OPA-MOF-5@PDMS@PU with a WCA of 155.9°. The produced modified sponge exhibited high sorption capacity and oil-water separation efficiency, with a sorption capacity of 26.7 (petroleum ether)-85.6 (chloroform) g/g and a separation efficiency of over 99 %. It has also shown satisfactory emulsion purification and flame retardancy capacities.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Canyu Cui,Shihui Jiao,Wenwen Wang,Guangsheng Pang
It is essential to synthesize a versatile organic solvent/water separation material with excellent stability and durability. Superwetting materials, known for their multiple practical functionalities in everyday life and industrial production, have been receiving special concern for years. In this paper, the multifunctional superhydrophobic surface has been successfully prepared by coating polydimethylsiloxane (PDMS) onto three-dimensional nest-like Co-Ni layered double hydroxides (LDHs) using fabrics as a substrate (N Co-Ni LDHs/PDMS). The hierarchical nest-like structure of Co-Ni LDHs promotes the formation of abundant air cushions and enhances self-cleaning ability under liquid, which is beneficial to the efficient separation of organic solvent/water mixture. The results fabrics (superhydrophilic N Co-Ni LDHs and superhydrophobic N Co-Ni LDHs/PDMS) exhibit a high separation efficiency of 99.1 % and a flux of 11400 L m −2 h −1 for n-hexane, kerosene, cyclohexane, tetrachloroethylene and tetrachloromethane. The separation efficiency is above 99.0 % and flux is above 10200 L m −2 h −1 after 10 cycles of separation. The superhydrophobic N Co-Ni LDHs/PDMS can load 21 times its own weight and sail on water at a velocity of 60 cm s −1 . Additionally, the superhydrophobic fabrics display excellent chemical stability and mechanical durability. The as-fabricated fabrics are suitable for application in organic solvent/water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Sheng Xu,Hao Zhang,Fen Yu,Xiaoxu Zhao,Yan Wang
In this study, dodecylamine-modified zeolitic imidazolate framework-90 (DLA-ZIF-90) particles with enhanced surface hydrophobicity are synthesized and incorporated into the polydimethylsiloxane (PDMS) matrix to fabricate novel PDMS/DLA-ZIF-90 mixed matrix membranes (MMMs) for ethanol recovery via pervaporation. The successful modification of ZIF-90 particles is investigated via various characterization techniques. The morphology and physicochemical properties of the PDMS/DLA-ZIF-90 MMMs are studied and characterized. Compared to the PDMS MMM with unmodified ZIF-90, PDMS/DLA-ZIF-90 MMM exhibits enhanced morphology homogeneity and separation performance, contributed by the flexible inner channels of ZIF-90-DLA particles with enhanced adsorption selectivity, as well as the improved affinity between ZIF-90-DLA particles and PDMS matrix. The MMM with 2.5 wt% DLA-ZIF-90 loading shows the best performance with the optimal flux of 99.5 g m −2 h −1 and corresponding separation factor of 15.1 at 60 °C. The effect of operation temperature is also studied. The performance benchmarking shows that PDMS/DLA-ZIF-90 MMM exhibits superior pervaporation performance to most other PDMS-based membranes, and may therefore shed valuable insights to the development of high-performance ZIF-based MMMs for organic recovery.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Weitao Song,Huiping Song,Shirui Zhang,Zhenlian Fan,Fangqin Cheng
Superhydrophobic coatings have garnered immense attention in recent years. Nevertheless, the creation of superhydrophobic coatings is often associated with high production costs and comparatively intricate fabrication processes. In this paper, we utilize cheap and easily available ultrafine fly ash(FA) as the main raw material to replace the expensive filler substances traditionally used for constructing rough structures, and Polydimethylsiloxane(PDMS) as a low surface energy modification to construct FA-based superhydrophobic coatings by a simple spraying method. The PDMS/FA coating surface exhibits a water contact angle(WCA) of 157.65°and a water sliding angle(WSA) of 2.00° The irregular morphology of the FA is conducive to forming a rough texture on the coating surface, which captures more air, leading to the formation of a stable air layer. Molecular dynamics (MD) simulations provide an insight into the anti-wetting mechanism of the superhydrophobic surface through an analysis of energetic and dynamic properties. PDMS/FA coatings remain superhydrophobic at 150 °C, in UV, and in varying pH environments. In addition, PDMS/FA coatings offer excellent mechanical, self-cleaning and anti-icing properties. This innovative approach to superhydrophobic coating, utilizing solid waste material as a basic material, demonstrates potential applicative value in fields such as self-cleaning and anti-icing.
研究领域:
材料科学
·
表面工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiaolu Wang,Jinxun Chen,Manquan Fang,Tao Wang,Lixin Yu,Jiding Li
In this contribution, zeolitic imidazolate framework (ZIF-7)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) with uniformly dispersed ZIF-7 were fabricated. The homogeneous dispersion of ZIF-7 nanoparticles in PDMS matrix and better interface compatibility were characterized by SEM and EDS. PV performance reveals that the MMMs display increased total flux and the highest separation factor occurs at 20 wt% ZIF-7 loading, which were 1689 g m −2 h −1 and 66 respectively as compared to 1080 g m −2 h −1 and 51 for pure PDMS membrane when separating 1 wt% butanol aqueous solution at 60 °C. The total flux reaches 3496 g m −2 h −1 with 80 wt% butanol in permeate for the enrichment of 5 wt% butanol solution at 60 °C. The enhanced flux may result from enlarged free volume in the polymer matrix caused by the incorporation of ZIF-7 nanoparticles. Moreover, the super-hydrophobic ZIF-7 pore channels and butanol preferential permeation may contribute to the improvement of separation factor. The result also shows that there is a 21.1% reduction of energy barrier for penetrant transportation for 20 wt% ZIF-7 filled PDMS membrane as compared to pristine PDMS membrane. A long period of pervaporation experiment was also carried out to investigate the structure stability of the ZIF-7/PDMS membrane, and the MMM remains intact during the 240 h continuous operation, which is the key to industrial application for membrane-based separation process. All above indicated that ZIF-7 is a good filler to fabricate butanol permselective pervaporation membranes for butanol separation and enrichment.
研究领域:
材料科学
·
化工分离技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Guanzhong Zhai,Junwei Wu,Zhuorui Yuan,Hongmei Li,Daohua Sun
A major challenge in oil/water separation is the processing of surfactant-stabilized emulsions from the water medium. One of the feasible schemes of emulsion separation is the porous melamine sponge coupled with functional particles. Here, we proposed a novel superhydrophobic metal–organic framework (MOF)-based sponge for water-in-oil emulsion separation. The porous melamine sponge was combined with poly(dimethylsiloxane) (PDMS)-coated hydrophobic SiO2 and UiO66-OSiR particles were prepared for demulsification via the one-step dipping method for the first time. The PDMS@SiO2@UiO66-OSiR sponge revealed excellent superhydrophobicity at a water contact angle of 160.7° and superlipophilicity at an oil contact angle of 0°. Compared with the pristine melamine sponge, the size-controllable PDMS@SiO2@UiO66-OSiR sponge could separate stabilized water-in-oil emulsions with ultrahigh separation efficiency (>98.64%) and high flux (e.g., 970 L·m–2·h–1). Meanwhile, the PDMS@SiO2@UiO66-OSiR sponge exhibited superior durability and mechanical reusability. Under harsh conditions such as strong acid and alkali, organic solvent corrosion, etc., all water contact angles of the PDMS@SiO2@UiO66-OSiR sponge were over 152°. Furthermore, the stress decreased by 5% when the sponge was subjected to 10 loading/unloading compression cycles at a constant strain of 60%. These results demonstrate that the PDMS@SiO2@UiO66-OSiR sponge can efficiently separate water-in-oil emulsions through its adjustable porous structure coupled with demulsification and hydrophobic particles. This study provides a step forward in developing a feasible strategy for the MOF-based sponge for emulsion separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Heritage Science
·
2013
·Vol. 1
·期 1
·1-10
·
IF 0
Zhao Jing,Luo Hongjie,Wang Liqin,Li Weidong,Zhou Tie,Rong Bo
The use of organic–inorganic hybrid compounds containing tetraethoxysilane (TEOS) and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) is one of the most promising approaches for using alkoxysilane-based formulations to improve the effectiveness of the consolidation of traditional silicate artifacts, such as ancient stone. Based on analysis of existing damaged potteries influenced by the crystallization of NaCl salt, the hybrid we prepared in this study provided a crack-free and homogeneous gel on the premise of appropriate PDMS-OH content. The consolidants were applied to samples prepared following procedures that simulate old pottery and the effect of the protective products was evaluated by characterizing the surface morphology, the determination of the consolidant uptake, color changes, water vapour permeability and several wet-dry cycles with salt. The best formulation found for the hybrid in the present work was made up of 10% PDMS-OH with TEOS, which showed a significant increase in compressive strength, with a value of 3.50 MPa at 3 mm depth of consolidation, similar to the sample treated with Primal SF(the commercial protective agents used for comparison purposes), which had 3.20 MPa in compressive strength at 2 mm depth of consolidation. Except for small color changes and excellent water vapor permeability, there was still no significant change, and the destructive effects from NaCl crystallization for the hydrophobic surface of the sample treated with hybrid material was different to what happened for the hydrophilic case in the original. Thus, this study has revealed, for the first time, the addition of an appropriate amount of PDMS-OH to TEOS helps to improve the mechanical properties, hydrophobic behavior and salt resistance of damaged pottery effloresced by the NaCl crystals; in addition small color changes and excellent water vapor permeability should also be taken into consideration.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
Biomimetics
·
2022
·Vol. 7
·期 4
·248
·
IF 3.743
Pan Cao,Huming Wang,Mingyi Zhu,Yifeng Fu,Chengqing Yuan
Any surface immersed in sea water will suffer from marine fouling, including underwater sound absorption coatings. Traditional underwater sound absorption coatings rely heavily on the use of toxic, biocide-containing paints to combat biofouling. In this paper, an environmentally-friendly nanocomposite with integrated antifouling and underwater sound absorption properties was fabricated by adopting MWCNTs-COOH and SiO2into PDMS at different ratios. SEM, FTIR and XPS results demonstrated MWCNTs were mixed into PDMS, and the changes in elements were also analyzed. SiO2nanoparticles in PDMS decreased the tensile properties of the coating, while erosion resistance was enhanced. Antibacterial properties of the coatings containing MWCNTs-COOH and SiO2at a ratio of 1:1, 1:3, and 1:5 reached 62.02%, 72.36%, and 74.69%, respectively. In the frequency range of 1500–5000 Hz, the average sound absorption coefficient of PDMS increased from 0.5 to greater than 0.8 after adding MWCNTs-COOH and SiO2, which illustrated that the addition of nanoparticles enhanced the underwater sound absorption performance of the coating. Incorporating MWCNTs-COOH and SiO2nanoparticles into the PDMS matrix to improve its sound absorption and surface antifouling properties provides a promising idea for marine applications.
研究领域:
材料科学
·
海洋工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Tao Zhu,Yuan Yuan,Linbo Song,Xingde Wei,Huiying Xiang,Xu Dai,Xujiang Hua,Ruijin Liao
The icing of wind turbine blades leads to a decrease in output power, seriously jeopardizing the economic benefits and operational reliability of wind farms. Conventional deicing techniques require expensive equipment and consume a large amount of energy. Low-interfacial toughness coatings without energy dissipation are believed to be a highly potential passive deicing technology. However, the durability in service is facing challenges. Herein, low-interfacial toughness PDMS coatings were prepared by physical blending. Through the optimization of added plasticizers and SiO 2 , PDMS coatings with excellent large-scale deicing performance were obtained. The constant deicing force and ice adhesion strength were reduced to 14.69 N/cm and 12.63 kPa, respectively. Moreover, a systematic durability assessment of the PDMS coating was carried out to address the actual operating conditions of wind turbines. Fortunately, the results showed that the PDMS coating could withstand 200 icing/deicing cycles while maintaining constant deicing force and ice adhesion strength of less than 50 N/cm and 30 kPa, respectively. After long-term thermal aging (21 days), UV irradiation (42 days) and salt spray corrosion (20 days), the PDMS coating still retained superior icephobicity and outstanding large-scale deicing performance. This work contributes to the research and development of low-interfacial toughness materials for large-scale deicing applications on wind turbine blades.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）