Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 26
·10225-10230
·
IF 0
Hao-Cheng Yang,Kun-Jian Liao,He Huang,Qing-Yun Wu,Ling-Shu Wan,Zhi-Kang Xu
The surface structures and properties of a membrane largely determine its in-service performance during a filtration process. Here we report a facile hydrophilization method via co-deposition of mussel-inspired polydopamine (PDA) and polyethyleneimine (PEI) on a polypropylene microfiltration membrane. The deposition time is greatly shortened and the surface hydrophilicity is significantly improved compared to those membranes decorated only by PDA. The dopamine/PEI deposition solution can be reused several times with negligible effect on the surface hydrophilicity of membranes. Moreover, the PDA/PEI coating endows the membranes with ultra-high water permeability, allowing microfiltration separation of oil-in-water emulsions under atmospheric pressure.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
Polymers
·
2024
·Vol. 16
·期 23
·3392
·
IF 4.7
Yuansong Ye,Huiping Shi,Yuchi Zhang,Jianrong Xia,Bing-Chiuan Shiu,Run Fang
Urushiol is recognized as a sustainable coating material with superior properties; however, it faces significant challenges in applications such as petrochemicals and marine engineering due to surface oil contamination. This study aimed to enhance the cleanability of urushiol-based coatings through hydrophilic modification. Polyethylene glycol monooleate (PEGMO) was identified as an appropriate hydrophilic macromonomer and utilized as a modifier to develop a novel urushiol-based coating, termed P(U-PEGMO), via thermal curing. The results indicated that copolymerization occurred between urushiol and PEGMO during the curing process, forming a stable urushiol copolymer with favorable compatibility. The incorporation of PEGMO greatly improved the surface hydrophilicity of the coatings, as evidenced by a reduction in the water contact angle to below 30° when the modifier content reached 30% or higher, demonstrating a high degree of surface hydrophilicity. This enhanced property imparted the modified coating with underwater superoleophobicity and reduced oil adhesion, thereby facilitating the removal of oil. The cleaning performance was evaluated using a simple water rinsing method, after which, less than 2.5 wt% of oil residues remained on the surface of the modified coating. The high hydrophilicity is considered responsible for the coating’s easy-cleaning capability. In addition, the modified coatings exhibited improved flexibility and impact resistance, albeit with a slight decrease in hardness.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2019
·Vol. 20
·期 2
·280-292
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IF 1.439
Shi Wenying,Li Hongbin,Du Qiyun,Wang Shuo,Zhang Haixia,Qin Xiaohong
Carboxylated multi-walled carbon nanotubes (cMWCNTs) were incorporated in membrane matrix during the drywet spinning process to improve membrane performance. Membrane surface composition and morphology were examined by means of FTIR and SEM. The effects of cMWCNTs content on membrane surface hydrophilicity, separation performance and dye adsorption properties were well investigated and characterized through WCA examination, the cross-flow filtration measurement and the adsorption experiment. The surface hydrophilicity, the water permeability, solute rejection and dye adsorption properties of the cMWNTs-incorporated hollow fiber membranes have been all improved. When cMWNTs content was 0.3 wt%, the cMWNTs-incorporated hollow fiber membrane obtained the obvious enhanced pure water flux (137.2 L·m -2 ·h -1 , at 0.1 MPa) which was 1.5 times as high as that of the original PSF hollow fiber membrane. The prepared cMWCNTs-incorporated membranes are expected to be used in the treatment of textile dyeing wastewater or employed as the supports of the composite membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Bei-Bei Jiang,Xue-Fei Sun,Lin Wang,Si-Yu Wang,Ru-Dong Liu,Shu-Guang Wang
Biofouling is a critical issue in membrane separations . Development of novel approaches for biofouling mitigation is of crucial importance for membrane-based technologies . In this research, D-tyrosine was immobilized on a polyethersulfone (PES) ultrafiltration membrane (UF) to mitigate biofouling with the synergistic effects of surface hydrophilicity and anti-microbial properties. Results showed that the grafting of D-tyrosine increased the surface hydrophilicity and imparted a smoother surface to the membrane without altering its transport properties. During bovine serum albumen (BSA) filtration tests, the unified membrane fouling index (UMFI) of D-tyrosine-polydopamine (PDA)/PES membrane was only 0.00162, probably half of the PDA/PES membrane’s UMFI without D-tyrosine. The flux recovery ratio (FRR) of the D-tyrosine-PDA/PES membrane was up to 79%, higher than the virgin PES membrane. Moreover, the D-tyrosine-PDA/PES membrane showed better anti-biofouling performance when inoculated with E. coli culture. The proposed membrane surface modification technique paves the way toward realization of biological control for mitigating biofouling by simultaneously enhancing the anti-adhesive and antimicrobial properties of the membrane.
研究领域:
环境科学
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材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 4
·1192-1197
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IF 1.637
Zhao YingRui,Yang Chao,Zhang HongYan,Qiang Gen,Fan HuiLing
Two kinds of ZnO/SiO 2 composite (labled as SZ-1 and SZ-2) were synthesized by sol–gel method and characterized by X-ray diffraction (XRD) patterns, XPS (X-ray photoelectron spectroscopy) spectra and Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectra. Water adsorption on the prepared sample was studied by in situ DRIFT. The as-synthesized SZ-1 and SZ-2 sample have different surface property due to the various aging methods in the sample preparation processes, thus showing different results of water adsorption. The adsorption sites (Si atom in Si–O–Si bond) on the surface of SZ-2 for water molecule are occupied by the –OCH 3 group and the hydrophilicity of SZ-2 is weaker, in comparison to SZ-1, which inhibits the formation of water film and ultimately decreases desulfurization performance of SZ-2. So, the desulfurization performance can be changed by altering the hydrophilicity of sorbent.
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 MEMBRANE SCIENCE
·
2009
·
IF 3.247
Yun-Feng Yang,Ling-Shu Wan,Zhi-Kang Xu
To endow microporous polypropylene membrane (MPPM) with durable surface hydrophilicity, a facile interfacial crosslinking approach was developed, combined with a pretreatment by dielectric barrier discharge (DBD) plasma at atmospheric pressure. The commercially available polyethylenimine (PEI) was coated on MPPM firstly and was sequentially crosslinked with p -xylylene dichloride and quaternized with iodomethane to form a permanently positively charged layer. The physical and chemical changes of the membrane surface were characterized by tensile test, FT-IR/ATR, XPS , and FESEM . The surface hydrophilicity of the modified MPPMs was evaluated by water contact angle and pure water flux measurements. Besides, the influence of surface charge on protein filtration involving flux decline and protein transmission was also investigated in detail. It is found that the optimal time of DBD plasma treatment is ∼30 s. Mass gain for the MPPMs during the interfacial crosslinking can be controlled conveniently by adjusting the PEI concentration from 1.0 to 15 g/L. The surface hydrophilicity can be significantly enhanced and is durable, characterized by the sharp decrease of water contact angle, the double increase of pure water flux and the stability test. The results of protein filtration suggest that the obtained highly hydrophilic and charged membrane surface is resistant to protein fouling. Furthermore, almost 100% of protein transmission indicates that the microfiltration characteristic of MPPMs is unchanged.
研究领域:
材料科学
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膜技术
·
表面改性
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Yunli Zhai,Baoquan Zhang,Xiufeng Liu,Ziqiang Tong
Spherical polyelectrolyte complexes (PECs) sized at 10–20 nm were synthesized to fabricate homogeneous polyelectrolyte complex membranes (HPECMs). The PEC dispersions at various concentrations were employed to manipulate the thickness of HPECMs. Zeta potentials were measured to quantify the charge density of PECs. Scanning electron microscopy was utilized to examine membrane morphology and thickness. The surface hydrophilicity of HPECMs was evaluated by using static water contact angles. Being subjected to isopropanol dehydration, the synthesized HPECMs with nano-sized spherical PECs exhibited excellent separation performance, good stability and durability. The HPECM with the thickness of 1.1 μm displayed a significantly high permeation flux (6.12 kg m –2 h −1 ) with an ideal water concentration in permeate (99.85 wt%). The use of nano-sized spherical PECs ensured the homogeneous nature of synthesized polyelectrolyte complex membranes, leading to the enhancement of pervaporation performances in isopropanol dehydration. The extension of this work would trigger a large-scale application of HPECMs for dehydration of organic solvents.
研究领域:
材料科学
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分离技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2014
·
IF 3.96
Wan-Zhong Lang,Xuan Zhang,Jian-Ping Shen,Hai-Peng Xu,Zhen-Liang Xu,Ya-Jun Guo
The impact of chemical treatment on the poly(vinylidene fluoride)/perfluorosulfonic acid (PVDF/PFSA) hollow fiber ultrafiltration membranes in acid, alkali and hypochlorite solutions was contrastively studied with PVDF/polyvinylpyrrolidone(PVP) ultrafiltration membranes. The morphologies, surface properties, permeation performances, antifouling ability and mechanical properties of the membranes were characterized by numerous state-of-the-art analytical techniques. The results reveal that the chemical treatment has less effect on the PVDF/PFSA membranes than on the PVDF/PVP membranes. After treating with alkali and hypochlorite solutions, the surface hydrophilicity of PVDF/PFSA membranes increases, while the surface hydrophilicity of PVDF/PVP membranes decreases. In comparison with the original membranes, the antifouling ability of the PVDF/PFSA membranes is improved, while the antifouling ability of the PVDF/PVP membranes declines. Compared with the chemically treated PVDF/PVP membranes, the treated PVDF/PFSA membranes are more easily regenerated after fouling. The chemical treatments lead to the decline of the mechanical strength in different degrees for both PVDF/PFSA and PVDF/PVP membranes. Nevertheless, this influence on PVDF/PFSA membranes is evidently less severe than on PVDF/PVP membranes.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Junjun Tan,Tao Pan,Ruojiao Su,Miaomiao Wang,Yuwei Jiang
Precise control of the size, morphology and surface hydrophilicity of HA nanocrystals is an important prerequisite for the realization of relevant applications, especially biologically relevant ones. Although sodium oleate-assisted hydrothermal methods have received considerable attention due to their impressive synthesis quality and extremely wide aspect ratio tunability. However, the synthesized nanocrystals are usually hydrophobic due to oleic acid encapsulation, which greatly limits their wide application in biomedical fields. In view of this, we have established a robust ligand exchange strategy with sodium citrate as the exchange ligand and a mixture of water and ethanol as the exchange environment. The ligand exchange reaction requires only 5 min of stirring at 25 °C. DLS and zeta potential results show that the ligand-exchanged HA nanocrystals are highly negatively charged in water and dispersed as individual particles in water. TG and IR results showed that the oleic acid ligands on the surface of the nanocrystals were completely replaced by citric acid ligands. TEM images showed no change in the size and morphology of the nanocrystals before and after ligand exchange. Moreover, the colloidal stability of the ligand-exchanged HA nanocrystals in water could be quickly recovered in a few seconds even after freeze-drying into powder. The success of ligand exchange is mainly attributed to the fact that sodium citrate complexes calcium ions more strongly than sodium oleate , as well as the addition of ethanol eliminates the oil-water interface providing the basis for the approach of sodium citrate molecules to HA nanocrystals. This strategy undoubtedly bridges the gap that oleic acid-coated HA nanocrystals can be quickly and efficiently transferred to water, allowing HA nanocrystals to be used in bio-related applications without any obstacles.
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 33
·e55835
·
IF 2.7
Jia Xu,Haitao Zou,Yanqiao Jin,Qixi Zheng,Fanghui Lei,Yuxin Wu
To improve the comprehensive properties of polybutylene furandicarboxylate (PBF), 2,5-furandicarboxylic acid (2,5-FDCA), and aliphatic chain diol 1,8-octanediol and 1,4-butanediol were used as monomers to synthesize a series of bio-based polybutylene glycol-octanediol 2,5-furandicarboxylate (PBOF). The results showed that the chemical composition of PBOF could be controlled through the molar ratio of monomers. Compared with PBF, as the proportion of octanediol segments gradually increased, PBOF could gradually transform from semi-crystalline thermoplastic to amorphous form, and the glass transition temperature ( T g ) gradually decreased. The crystallization ability reduced but a part of the crystal area was still retained. The copolyesters still has a decomposition temperature above 370°C, indicating excellent thermal stability. The introduction of the octanediol segment significantly improved the tensile mechanical properties and flexibility of the POBF copolyester. These meet the requirements for the preparation of bio-based engineering plastics. The water absorption rate of PBOF showed that it may have certain degradable potential. PBOF copolyesters have potential application prospects in bio-based medical plastics and biodegradable packaging polymer materials after copolymerization modification.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yuansong Ye,Jian Huang,Xiaolin Wang
Surface hydrophilicity and the inherent washing force are two crucial factors for constructing an underwater self-cleaning surface. Following this self-cleaning mechanism, we fabricated thermosensitive copolymer brushes of N-isopropylacrylamide (NIPAAm) and poly(ethylene glycol) methacrylate (PEGMA) on the polypropylene (PP) surface. Benefiting from the hydrophilic poly(ethylene glycol) (PEG) side chains, the copolymer brushes with the PEGMA content exceeding 5 mol % exhibited good surface hydrophilicity, whenever at temperatures below or above the lower critical solution temperatures (LCST). Hence their underwater oleophobicity was greatly improved with oil contact angles higher than 141° and oil adhesive forces lower than 20 μN. In addition, the sharp volume-phase transition feature was reserved in their copolymer backbones, as proved by the AFM result. Self-cleaning evaluation of the modified surfaces was performed by a simple temperature-change water cleaning method, after which only 0.2 wt % of oil residues remained on the brush surface of P(NIPAAm-5PEGMA) (with 5 mol % of PEGMA contents). The excellent self-cleaning capability is believed to be ascribed to its balanced surface features in hydrophilicity and the sharper volume-phase transition, when a hydrophilic surface can facilitate oil desorption and an intense conformation change of chain stretching and shrinking can offer the strong washing force to assist oil detachment. This study contributes to development of the underwater self-cleaning surface based on a hydrophilic surface with the chain motion.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Wenluan Zhang,Zijun Wang,Xiaobo Liu
In this work, poly(arylene ether nitrile) (PEN) was utilized to fabricate a separation membrane to remove dye molecules and oil/water emulsions for the very first time. Specifically, 15 wt% polyethylene glycol (Mw = 800 Da) was added to the casting solution as a pore-forming agent to enhance the flux. In situ-generated SiO2 nanoparticles (NPs) were utilized to improve the membrane surface hydrophilicity by the hydrolyzation of tetraethyl orthosilicate under weak acid conditions. However, the surface hydrophilicity improvement was not significant. It may be because the strong mechanical strength of PEN caused most of the SiO2 NPs to be buried within the polymer matrix or SiO2 NPs were lost by dissolution in the acidic water bath. Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy were performed to study the membrane surface chemical features. Scanning electron microscopy images were obtained to observe the membrane cross-section morphology.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 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）