JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 32
·
IF 1.866
Hao-Cheng Yang,Ming-Bang Wu,Yong-Jiu Li,Yi-Fu Chen,Ling-Shu Wan,Zhi-Kang Xu
Mussel-inspired chemistry has attracted widespread interest in the surface modification of polymer membranes. We have previously demonstrated a dopamine (DA) assisted codeposition process of polyethyleneimine onto polypropylene microfiltration membranes (PPMMs) for surface hydrophilization. In this work, we further investigate the effects of PEI molecular weight and DA/PEI mass ratio on the codeposition process and membrane performance. The results indicate that only low-molecular-weight PEI bring a distinct promotion in both surface wettability and water permeation flux for PPMMs. On the other hand, either excess DA or PEI is detrimental to the surface hydrophilicity of the studied membranes. The optimized PEI molecular weight is 600 Da and the corresponding mass ratio is 1:1 for the surface hydrophilization of PPMMs. These results are beneficial to understand those codeposition processes of dopamine with other polymers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43792.
研究领域:
材料科学
·
化学工程
·
生物仿生学
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DOI
高影响因子
FOOD MICROBIOLOGY
·
2025
·
IF 4.6
Ping Lu,Juan Xue,Aiying Shi,Xuemeng Ji
Cronobacter sakazakii is a notorious foodborne pathogen linked to severe infections in neonates, with powdered infant formula serving as a common transmission route due to its ability to survive under desiccated conditions. Understanding the molecular mechanisms underlying its desiccation resistance is crucial for developing effective control strategies. In this study, we employed comparative proteomics and hydropathy profiling to investigate putative core proteins potentially involved in desiccation resilience. Proteomic analysis of wild-type and 22 knockout strains identified 1,354 proteins, of which 156 were defined as putative core proteins due to stable abundance profiles. Among these, two uncharacterized proteins, ESA_03998 and ESA_01764 , exhibited strong hydrophilic properties and were predicted to be surface-associated based on signal peptide analysis. Gene knockout of ESA_03998 or ESA_01764 significantly reduced surface hydrophilicity and survival under prolonged desiccation in both PBS and milk powder matrices. Additionally, Laurdan-based membrane fluidity assays revealed increased membrane rigidification (ΔGP) in mutant strains, indicating that these proteins help preserve membrane hydration and dynamics under low-moisture conditions. These findings establish a novel link between hydrophilic putative core proteins and membrane-associated desiccation resistance in C. sakazakii , offering insights into its persistence in dry food environments and highlighting potential targets for mitigating contamination in powdered infant formula.
研究领域:
微生物学
·
分子生物学
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食品科学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 6
·686
·
IF 2.935
Li-Fen Liu,Xing-Ling Gu,Xin Xie,Rui-Han Li,Chun-Yang Yu,Xiao-Xiao Song,Cong-Jie Gao
In this study, modification of polysulfone (PSf)/sulfonated polysulfone (SPSf) blended porous ultrafiltration (UF) support membranes was proposed to improve the reverse osmosis (RO) performance of aromatic polyamide thin film composite (TFC) membranes. The synergistic effects of solvent, polymer concentration, and SPSf doping content in the casting solution were investigated systematically on the properties of both porous supports and RO membranes. SEM and AFM were combined to characterize the physical properties of the membranes, including surface pore natures (porosity, mean pore radius), surface morphology, and section structure. A contact angle meter was used to analyze the membrane surface hydrophilicity. Permeate experiments were carried out to evaluate the separation performances of the membranes. The results showed that the PSf/SPSf blended porous support modified with 6 wt % SPSf in the presence of DMF and 14 wt % PSf had higher porosity, bigger pore diameter, and a rougher and more hydrophilic surface, which was more beneficial for fabrication of a polyamide TFC membrane with favorable reverse osmosis performance. This modified PSf/SPSf support endowed the RO membrane with a more hydrophilic surface, higher water flux (about 1.2 times), as well as a slight increase in salt rejection than the nascent PSf support. In a word, this work provides a new facile method to improve the separation performance of polyamide TFC RO membranes via the modification of conventional PSf porous support with SPSf.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 20
·
IF 1.866
Caihong Wang,Hao Wu,Fangshu Qu,Heng Liang,Xiaojun Niu,Guibai Li
To investigate the influence of magnetic materials combined with carbon nanotubes (CNTs) as fillers on the membrane properties, multi-walled carbon nanotubes (MWCNTs) functionalized by mixed acids (V H2SO4 :V HNO3 =3:1) were loaded by Fe 3 O 4 through a hydrothermal method. The obtained MWCNTs/Fe 3 O 4 hybrids were characterized by X-ray diffraction (XRD), Infrared spectroscopy (IR) spectrum, and scanning electron microscope (SEM) and then blended with polyvinyl chloride (PVC) to prepare ultrafiltration (UF) membranes through a phase inversion process. Simultaneously, two other UF membranes, PVC blended with acid-treated MWCNTs and PVC blended with nothing, were also prepared. The results showed that the membrane porosity and mean pore size increased slightly with the addition of fillers. Static contact angle showed that MWCNTs/Fe 3 O 4 hybrids improved the hydrophilicity of membrane surface better than the acid-treated MWCNTs. Pure water flux increased consistently with the hydrophilicity of the membrane surface. SEM and atomic force microscope (AFM) images showed that the MWCNTs/Fe 3 O 4 blended membrane formed a relatively complete pore structure throughout the cross-section and had a rougher top surface. However, the mechanical properties of membranes with fillers were reduced compared with the pristine PVC membrane. The rejections of membranes for Bovine serum albumin (BSA), Bisphenol A (BPA), and Norfloxacin (NOR) showed that MWCNTs/Fe 3 O 4 played an important role in trapping pollutants in membrane filtration. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43417.
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
Materials
·
2023
·Vol. 16
·期 14
·5149
·
IF 3.4
Wei Fan,Shaoxiong Zhu,Jingjing Nie,Binyang Du
Thermo-sensitive microgels known as PMO-MGs were synthesized via surfactant free emulsion polymerization, with poly(ethylene glycol) methacrylate (OEGMA475) and 2-(2-methoxyethoxy) ethyl methacrylate (MEO2MA) used as the monomers and N, N-methylene-bis-acrylamide used as the crosslinker. PMO-MGs are spherical in shape and have an average diameter of 323 ± 12 nm, as determined via transmission electron microscopy. PMO-MGs/poly (ether sulfone) (PES) composited ultrafiltration membranes were then successfully prepared via the non-solvent-induced phase separation (NIPS) method using a PMO-MG and PES mixed solution as the casting solution. The obtained membranes were systematically characterized via combined X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy and contact angle goniometer techniques. It was found that the presence of PMO-MGs significantly improved the surface hydrophilicity and antifouling performance of the obtained membranes and the PMO-MGs mainly located on the channel surface of the membranes. At 20 °C, the pure water flux increased from 217.6 L·m−2·h−1for pure PES membrane (M00) to 369.7 L·m−2·h−1for PMO-MGs/PES composited membrane (M20) fabricated using the casting solution with 20-weight by percentage microgels. The incorporation of PMO-MGs also gave the composited membranes a thermo-sensitive character. When the temperature increased from 20 to 45 °C, the pure water flux of M20 membrane was enhanced from 369.7 to 618.7 L·m−2·h−1.Keywords:microgels;ultrafiltration;membrane;thermo-sensitivity
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
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Ruixue Yin,Nan Zhang,Wentao Wu,Kemin Wang
Cyclic acetals based biomaterial without acidic products during hydrolytic degradation is a promising candidate for tissue engineering applications; however, low hydrophilicity is still one limitation for its biomedical application. In this work, we aim to achieve non-water-swellable cyclic acetal networks with improved hydrophilicity and surface wettability by copolymerization of cyclic acetal units based monomer, 5-ethyl-5-(hydroxymethyl)-β,β-dimethyl-1, 3-dioxane-2-ethanol diacrylate (EHD) and methoxy poly(ethylene glycol) monoacrylate (mPEGA) under UV irradiation, to avoid swelling of conventional hydrogels which could limit their applicability in particular of the mechanical properties and geometry integrity. Various EHD/mPEGA networks were fabricated with different concentrations of mPEGA from 0 to 30%, and the results showed photopolymerization behavior, mechanical property and thermal stability could not be significantly affected by addition of mPEGA, while the surface hydrophilicity was dramatically improved with the increase of mPEGA and could achieve a water contact angle of 37° with 30% mPEGA concentration. The obtained EHD/mPEGA network had comparative degradation rate to the PECA hydrogels reported previously, and MTT assay indicated it was biocompatible to L929 cells.
研究领域:
生物材料
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiangzhi Xue,Zheng Liang,Jian Zhou,Huiqin Zhang,Qilin Gu,Zhaoxiang Zhong,Weihong Xing
Brine purification process using ceramic membrane has the advantages of short process, high filtration precision, low cost and long life. Silicon carbide (SiC) ceramic membranes are featured by excellent hydrophilicity and unique negatively charged surface. This work focused on the application of low-temperature reaction bonded SiC membranes in brine purification, and commercial SiC membranes prepared by the recrystallisation method were also adopted for comparison. Under low-energy conditions (transmembrane pressure ≤0.1 MPa, crossflow velocity ≤2 m·s -1 ), the low-temperature reaction bonded SiC membranes exhibited higher stable flux and superior antifouling performance (i.e., lower flux decline), attributed to the formation of a cake layer on the membrane surface. However, at high pressures (>0.1 MPa) and velocities (>2 m·s -1 ), some precipitated particles entered the pores of reaction bonded SiC membranes, resulting minor pore blockage, reducing permeability. Interestingly, the gradually increased initial permeate flux observed in cycling filtration was attributed to the increased surface hydrophilicity of SiC membranes. Therefore, low-temperature reaction bonded SiC membranes can provide a high-efficient and energy-saving brine purification process in the chlor-alkali industry.
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
·
2025
·
IF 5.4
Jialong Bai,Jieyu Yi,Weiwang Chen,Long Kang,Zhiqiang Zhang
Frothers not only modify gas–liquid interfacial properties, but also alter coal particle surface properties, thereby influencing bubble–coal particle interactions in froth flotation processes. While previous studies have focused on frothers’ effects on gas-liquid interfaces, their impact on coal surface hydrophilicity and coal-bubble interactions remains underexplored. In this study, we measured the bubble–coal interactions using an anthracite coal sample under varying concentrations of MIBC and DF250 frothers during attachment and detachment processes of coal, in combination with surface tension measurement, XPS, FTIR, contact angle measurements, and quantum chemistry calculations. The results demonstrate that both MIBC and DF250 will adsorb on the coal surface and impart hydrophilicity onto it. Increasing frother concentration will render the coal surface more hydrophilic, which will prolong liquid drainage time (t drain ) and enhance the attachment repulsive force (F adr ) during bubble–coal particle attachment. At the same time, this also will decrease the detachment attraction force (F det ) of coal particle. In the examined concentration range, DF250 exhibits more pronounced effects than MIBC, meaning that it is less suitable for coal flotation. For both frothers and in the studied concentration range, F adr consistently exceeds F det , meaning that immediately removal of coal-bubble aggregates from the mixing zone of flotation cell seems to be desirable. In addition, regardless of the presence or absence of frother in water and the structure difference in MIBC and DF250, the contact angle of coal surface should be a good indicator of the strength of coal-bubble interactions.
研究领域:
矿物加工工程
·
界面化学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qingwen Tang,Xiaoqiang An,Huachun Lan,Huijuan Liu,Jiuhui Qu
Nanomaterial modification provides an effective way to enhance the separation performance of nanofiltration membranes, but the limited hydrophilicity of conventional nanostructures causes their poor solubility in solvents, affecting the quality of polyamide membranes for performance enhancement. Herein, we explored quasi-water soluble carbon nitride as a homogeneous modifier to improve the nanofiltration performance of polyamide membranes. With sufficient hydroxyl, amino, and cyano groups, the introduced quasi-water soluble carbon nitride significantly enhanced the surface hydrophilicity of the support membrane, resulting in the formation of an ultrathin functional layer for high-efficiency desalination. The high permeation flux of 108.64 L m -2 h −1 (4 bar) was even twice and three times higher than those of the pristine polyamide membrane and commercial nanofiltration membranes, with a high Na 2 SO 4 barrier rate of 98.84 % and a Cl - /SO 4 2- selectivity of 76. This work provides an effective way to precisely regulate the structure of nanofiltration membranes for high-performance water purification.
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
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 37
·24201-24209
·
IF 4.493
Zhiwei Lv,Jiahui Hu,Xuan Zhang,Lianjun Wang
In the current study, thin-film composite (TFC) nanofiltration membranes desirable for water softening were successfully developed through interfacial polymerization using N-(2-hydroxyethyl)ethylenediamine (HEDA) as the amine monomer in the aqueous phase. The hydrophilicity of the membrane surface was greatly enhanced with the introduction of the residual hydroxyl groups during the fabrication process. The TFC membranes possessed a permeate flux of 15.8 L m−2 h−1 under 0.6 MPa, with a rejection of 85.9%, 73.8%, and 99.8% for Na2SO4, MgSO4 and Congo red, respectively. The interplays of the solvent, solute and polymer matrix on the separation performance were investigated by means of the solubility parameter study. Moreover, density functional theory was employed to calculate the Fukui function by the Hirshfeld charge, which gave the global and local softness values to predict the reactivity of the atomic sites in the HEDA molecule. The findings of this study support the possible forming mechanism of the barrier layer for the first time. The TFC membrane was found to be stable and displayed good separation ability over a week-long filtration process. The combined results of this work suggest that these HEDA/TMC TFC nanofiltration membranes are promising candidates for various applications, such as desalination and dye removal from wastewater.
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
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 24
·20015-20023
·
IF 3.201
Shi-Xian Zhang,Xiao-Li Wu,Tong-Hui Hao,Guo-Hua Hu,Tao Jiang,Qun-Chao Zhang,Hui Zhao
Environmentally friendly waterborne polyesters (WPEs) were obtained by copolymerization of diethylene glycol (DEG), isophthalic acid (IPA) and 5-sulfoisophthalic acid monosodium salt (5-SSIPA). The effects of the 5-SSIPA content on the properties of the resultant copolymers, including dispersity, crystallinity, dynamic thermo-mechanical properties, thermal stability and surface properties, were investigated. The 5-SSIPA contents in the intended polymers were determined by the peak areas of proton nuclear magnetic resonance (1H-NMR) spectra. Transmission electron microscopy (TEM), electrophoretic light scattering (ELS) and dynamic light scattering (DLS) were used to characterize the dispersion and stability performance of waterborne polyester solutions. The crystallinity of the WPEs was determined using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). As the 5-SSIPA content increased, the glass-transition temperature (Tg) of the WPEs increased significantly according to dynamic mechanical analysis (DMA), the thermal stability of the WPEs was deteriorated according to thermogravimetric analysis (TGA), surface roughness did not change according to atomic force microscopy (AFM), and their solid surface tension was increased from 28.47 to 32.90 mJ m−2 based on static contact angle measurements. Water contact angle (WCA) measurements proved that WPE dispersions could be used for enhancing the hydrophilicity of the PET surface.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingsheng Hu,Qizhao Wang,Yan Li,Yan Meng,Lei Wang,Houde She,Jingwei Huang
In this work, Molybdenum (Mo) doped bismuth vanadate (BiVO 4 ) is carried out by traditional calcination method, while carbon-based cobalt (Co-Ci) is prepared by photoelectric deposition (PED) and used as co-catalyst to decorate the surface, its photocurrent density reached 3.15 mA/cm 2 at 1.23 V vs RHE. More importantly, the H-Co-Ci/Mo: BiVO 4 photoanode obtained by plasma etching of Co-Ci/Mo: BiVO 4 has greatly improved surface hydrophilicity. The photocurrent density of H-Co-Ci/Mo: BiVO 4 photoanode is 4.8 times that of BiVO 4 photoanode, reaching 3.95 mA/cm 2 . In addition, the incident photon-current conversion efficiency (IPCE) value of the H-Co-Ci/Mo: BiVO 4 photoanode is as high as 60%, and both the injection and separation efficiency have also been enhanced. The enhanced photoelectrochemical (PEC) performance is attributed to the good wettability of the material surface and improvement of water oxidation kinetics. These findings provide a mild and efficient modification method for improving BiVO 4 used for water splitting, and are expected to provide new ideas for other photoanodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）