Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-12
·
IF 36.3
Hu Zhen-Yu,Liu Tian,Yang Yu-Ru,An Alicia Kyoungjin,Liew Kim Meow,Li Wen-Wei
Polyvinylidene fluoride nanofibers were treated by dimethylformamide to create micropores on membrane surface.
Photocatalysts were firmly bounded by nanofibers during stretching and shrinking.
Particulate catalysts were fixed yet high exposed on the membrane surface.
Surface self-bounded photocatalytic membrane exhibited tenfold higher decontamination activity than embedded catalyst.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Shaobin Wen,Yao Xu,Liyuan Fan,Bin Peng,Jingyu Zhang,Qiang Zhang,Yulian Pang,Yufei Deng,Yingquan Zou
Hydrophilic coating is frequently used to enhance the anti-fouling performance of membrane. However, traditional strategies often suffer from defects of cumbersome steps, high energy consumption, and unstable coating. Herein, radical and cationic photopolymerization are used for hydrophilic coating of membranes. Two photosensitive resins were first synthesized either by direct radical copolymerization of 3-ethyl-3-(methacryloyloxy) methyloxetane and 2-hydroxyethyl acrylate (Poly(HEA-EMO)) or through post-polymerization modification of poly(2-hydroxyethyl acrylate) with vinyl groups (Poly(HEA-MA)). Subsequently, hydrophilic coating was conducted on the membrane surface by UV-induced curing of different photosensitive resins, either through radical photopolymerization of vinyl-functional Poly(HEA-MA) or cationic photopolymerization of Poly(EMO-HEA) with pendent oxetane groups. The modified membranes showed enhanced hydrophilicity and underwater oleophobicity than the original membrane. Moreover, the coating (PAN / HEA(C5)) by cationic photopolymerization exhibited lower shrinkage, smoother surface, and more excellent antifouling performance than that by radical photopolymerization . After bovine albumin fouling-cleaning cycles, the flux recovery rate (FRR) of the original membrane was only 68.6 %, while the FRR of PAN / HEA(C5) was as high as 98.0 %. Furthermore, it showed superior long-term operational stability, proving the stability of the coating formed by cationic photopolymerization .
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wenguang Wang,Yanqiu Zhang,Feiran Li,Yuhao Chen,Seyed Majid Mojallali Rostami,Seyed Saeid Hosseini,Lu Shao
Mono/multivalent cation separation techniques have shown increasing importance in diverse environmental and energy applications. The separation performance of emerging monovalent cation exchange membranes (MCEMs) is greatly determined by the architecture and charge property of MCEMs, which should be finely tuned for the energy efficiency applications. Herein, a series of mussel-inspired polyphenol/polyethyleneimine assembled membranes (PPAMs) with highly positively-charged surfaces were elegantly constructed through a facile layer-by-layer assembly method. Based on the synergetic reactions between polyphenols with multiple reactive groups and PEI with abundant amino groups, the denser membrane surfaces with a higher crosslinking degree and more positive charges were readily formed. As a result, the Na + /Mg 2+ and Li + /Mg 2+ perm-selectivities of PPAMs with such surface architecture and charge property followed the same order as gallic acid/polyethyleneimine membrane (M-GA/PEI) > pyrogallic/polyethyleneimine membrane (M-Pyrogallic/PEI) > protocatechuic acid/polyethyleneimine membrane (M-PA/PEI) > caffeic acid/polyethyleneimine membrane (M-CA/PEI). Most interestingly, the M-GA/PEI fabricated exhibited the unprecedented perm-selectivity (Na + /Mg 2+ ) up to 180.4 with Na + flux of 6.01 × 10 −8 mol cm −2 s −1 , which exceeded the current “Upper Bound” plot of MCEMs. The low membrane resistance and excellent separation performance of PPAMs brought great potential for resource recovery and environmental remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Jindan Wu,Wei Wei,Shihong Li,Qi Zhong,Fu Liu,Jinhuan Zheng,Jiping Wang
The effect of membrane surface charge on demulsification and fouling resistance during emulsion separation is investigated. By grafting poly(2-dimethylaminoethyl methacrylate) (pDMAEMA) and poly(oligo(ethylene glycol) methacrylate) (pOEGMA) onto polypropylene (PP) membrane via ultraviolet (UV)-initiated polymerization, the obtained membranes PP- g -pDMAEMA and PP- g -pOEGMA present positive and negative surface charges in water, respectively. During the emulsion separation, PP- g -pOEGMA and PP- g -pDMAEMA membranes exhibit different separation efficiencies and pollutant resistant behaviors to the emulsions prepared from anionic surfactant (sodium dodecyl sulfate, SDS) and cationic surfactant (cetyltrimethylammonium bromide, CTAB). Comparing to PP- g -pOEGMA, the separation efficiency of PP- g -pDMAEMA was 15% (SDS emulsion) and 300% (CTAB emulsion) higher. But the flux recovery ratio of PP- g -pOEGMA was raised 30% (SDS emulsion) and 16% (CTAB emulsion). Hence, the membrane surface positive charges assist demulsification, but aggravate the membrane fouling . The mechanism obtained is beneficial to construct membranes with high separation efficiency and long-term durability.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Wen-Ze Qiu,Zi-Shu Zhao,Yong Du,Meng-Xin Hu,Zhi-Kang Xu
Biofouling control is a major task in membrane separation processes for water treatment and biomedical applications. In this work, N -alkylated polyethylenimine (PEI) is facilely and efficiently introduced onto the membrane surfaces via the co-deposition of catechol (CCh) and PEI, followed by further grafting of PEIs (600 Da, 70 kDa and 750 kDa) and cationization with methyl iodide (CH 3 I). The physical and chemical properties of the constructed membrane surfaces are characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential and water contact angle measurements. Antibacterial assay reveals that the optimized membrane surfaces possess around 95% antibacterial efficiency against Gram-positive Staphylococcus aureus ( S. aureus ) with weak adhesion of bacteria cells after 24 h of bacterial contact. Additionally, the membrane surfaces also exhibit much enhanced antifouling property during the filtration of opposite charged bovine serum albumin (BSA). These results demonstrate a useful strategy for the surface modification of separation membranes by a kind of antimicrobial and antifouling coating.
研究领域:
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Li-Jing Zhu,Hai-Ming Song,Chen Li,Gang Wang,Zhi-Xiang Zeng,Qun-Ji Xue
The preparation of thermo-responsive polymeric porous membranes with well-defined morphology and high mechanical strength is still a great challenge. In our work, high strength and self-supporting polysulfone/poly(N-isopropylacrylamide) (PSf/PNIPAm) membranes with tuning wormlike network morphology and thermo-responsibility were successfully prepared via the approach combining in situ cross-linking polymerization with vapor-liquid nonsolvent induced phase separation (V-LIPS). With increasing the NIPAm concentration and the exposure time during the VIPS process, the wormlike networks self-assembled on the membrane surfaces, and their diameter rapidly increased to ~ 63 nm in 60 s. As a result, the pore size/porosity of the membranes increased and the membrane hydrophilicity improved, leading to high water flux with a maximum value of ~ 222 L m −2 h −1 at 23 °C. Furthermore, the permselectivity of the fabricated membranes exhibited strong and fully reversible thermo-responsive character as feed temperature ranged from 23 to 50 °C, in which the thermo-responsive coefficient was as high as ~ 3.7 after viscosity correction and the size distribution of silver nanoparticles in the filtrates narrowed down sharply. In addition, the fabricated membranes with wormlike network morphology exhibited the maximum tensile strength of ~ 6 MPa and elongation at break of ~ 33%, which are much higher than the block copolymers based membranes with the similar morphology. The approach provided here opens a new and simple way to prepare high strength PSf membranes with tuning network morphology and thermo-responsive permselectivity in large scale, and which is expected to be expanded to fabricate other polymeric microporous membranes.
研究领域:
材料科学
·
膜技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhishang Wan,Lihong Gan,Wei-Ning Wang,Yi Jiang
Electrospray is an effective, fast, and potentially scalable approach for membrane surface functionalization using various engineered nanomaterials (ENMs). However, the lack of fundamental understandings of the deposition process hinders the controlled deposition, efficient utilization, and long-term stabilization of the ENMs, and thus the practical applications of the nanocomposite membranes. To bridge this critical knowledge gap, advanced online characterization techniques (laser diffraction size measurement and laser doppler velocimetry) coupled with mathematical aerosol modeling are utilized to understand the three key process parameters: droplet size, deposition velocity , and evaporation rate. After deposition, polymeric solvent bonding (i.e., interdiffusion and subsequent entanglement of polymers) was found to substantially stabilize the deposited Ag NPs. We further provide a comprehensive description of such interfacial reaction mechanisms. Our results show a consistency between theoretical predication and measurement of the droplet size or deposition velocity, whereas realistic droplet evaporation rate is lower than the theoretical value due to the addition of the polymer. Successful stabilization of Ag NPs via interfacial polymeric bonding occurs under the conditions of large material contact area, high material compatibility, proper temperature (e.g., 22 °C), and polymer-to-solvent ratio (e.g., 3–5%). Our coupled approach achieves superior Ag NP coverage with high stability within minutes. Despite some reduction in water permeance, the resultant membrane shows markedly improved catalytic and antimicrobial (antibiofouling) performance (>90% enhancement) and maintained rejection. Taken together, our findings provide fundamental insights into the coupled process of electrospray deposition and polymeric solvent bonding to enable additive manufacturing of novel nanocomposite membranes with diverse structures and multiple functions.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
·
2015
·Vol. 56
·期 5
·3314-3319
·
IF 3.404
Yau Kei Chan,Kwun Hei Samuel Sy,Chun Yu Wong,Ping Kwan Man,David Wong,Ho Cheung Shum
Purpose.:There is a lack of a standardized methodology or a physiologically realistic in vitro model to investigate silicone oil (SO) emulsification. In this study, we replicated the SO–aqueous interface within a microfluidic chip to study the formation of SO emulsion droplets in the eye cavity.Methods.:A chip made of poly(methylmethacrylate) was used to represent a cross-section of the posterior eye chamber. A retinal ganglion cell line was coated on the inner surface of the chamber to mimic the surface property of the retina. Silicone oil of different viscosities were tested. The SO–aqueous interface was created inside the chip, which, in turn, was affixed to a stepper-motor-driven platform and subjected to simulated saccadic eye movement for four days. Optical microscopy was used to quantify the count and size of SO emulsified droplets.Results.:Among SO of different viscosities, SO 5 centistokes (cSt) emulsifies readily, and a high number of droplets formed inside the chip. Silicone oil 100 cSt led to fewer droplets than 5 cSt, but the droplet count was still significantly higher than other SO of higher viscosities. There were no significant differences in the number of droplets among SO with viscosities of 500, 1000, and 5000 cSt. In all SOs tested, the number of droplets increased, whereas their size decreased with longer duration of simulated saccades.Conclusions.:The study platform allows quantification of the number and size of emulsified SO droplets in situ. More importantly, this platform demonstrates the potential of microtechnology for constructing a more physiologically realistic in vitro eye model. Eye-on-a-chip technology presents exciting opportunities to study emulsification and potentially other phenomena in the human eye.
研究领域:
眼科
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Jia Xu,Lili Zhang,Xueli Gao,Haiyan Bie,Yunpeng Fu,Congjie Gao
In this study, a facile and novel strategy for constructing tunable antimicrobial NF membrane surface was developed by a simple electrostatic assembly of polycation–copper(II) complex on the polyacrylonitrile substrate surface followed by cross-linking. Polycation–copper(II) complex with high stability and charge density, using polyethyleneimine (PEI) as a capping ligand, was formed by exquisitely manipulating the pH and Cu 2+ concentration for strong assembly on the surface. We confirmed that PEI–copper(II) complex assembly was a good way to significantly improve the Cu 2+ loading efficiency in terms of loading time and loading amount with AAS and EDS measurements. We also demonstrated that cross-linking had a significant influence not only on the strong assembly of PEI–Cu(II) complex to the substrate surface but also on the controllable Cu 2+ release, which was confirmed by SEM, EDS and AAS measurements after exposing the NF membrane to bath sonication and real seawater. The NF membrane exhibited significant antimicrobial activity with antibacterial efficiency of more than 95% and prevented effectively the formation of biofilms for up to 6-month test. For real seawater softening, the NF membrane achieved approximately 32.3 L/m 2 h flux and 43.5%, 68.3%, 98.1%, 19.1% and 18.7% rejection of salt, SO 4 2− , Mg 2+ , Na + and Cl − , respectively, with a high softening efficiency (low S value) compared to other commercial NF membranes. We hope that the present method can be developed as a competitive technology for the fabrication of robust and versatile antimicrobial membrane, leading to the high efficiency of seawater softening.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Xuan Zhao,Qingzhi Han,Na Na,Jin Ouyang
Cell membrane surface receptor proteins play an important role in cellular biological processes. There are numerous methods to detect receptors, yet developing an artificially controlled and specific detection and treatment strategy remains a challenge. Herein, we develop such a strategy based on upconversion nanoparticles (UCNPs) loaded DNA probes that enable two-color ratiometric imaging excitated by a 980 nm laser. The light response controllable signal opening strategy avoids waste during probe transportation and improves sensitivity. Thereby the number of receptors on individual DU145 cell membranes is counted by single-molecule detection. Due to the different expression of specific receptor proteins, the number of single fluorescent dots counted can be used as a basis for distinguishing DU145 from other cells. This work is highly controllable to increase sensitivity, providing a platform for cancer diagnosis and treatment.
研究领域:
生物化学
·
分子生物学
·
纳米医学
·
癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2017
·
IF 0
Jiayu Wu,Haiming Song,Dan Li,Weifeng Zhao,Weijie Zhang,Long Kang,Fen Ran,Changsheng Zhao
In this study, an environmentally friendly approach for surface modification of polymer membrane was reported, which named surface-initiated electrochemically mediated atom transfer radical polymerization (SI-eATRP). It was triggered after diffusion of a CuI/L activator generated at a working electrode. The introduction of electrochemically mediation can control the polymerization of monomers by a one-electron reduction of an initially added air-stable CuII salt. The reaction was carried out in an electrochemical cell with a three-electrode system at low temperature. Using this technique, hydrophilic polymer brushes of poly(N-vinylpyrrolidone) were grafted onto PES membrane surface. The effects of reaction conditions like polymerization time, monomer concentration, initiator amount, and different monomer on the polymerizations of monomer were investigated in detail. Based on these data, we concluded that the polymerization on polymer membrane surface could be controlled by mediating the reaction condition. Moreover, the precisely controlled polymerization may allow it to serve as excellent model systems for polymer membrane modification, in general, to illustrate the role of electrochemically mediating on the polymerization approach. And the water contact angle of the modified membrane decreased from 89° to 72°. The APTT of the modified membrane increased from 46 s to 81 s. Those results indicated that the surface modification by grafting PVP brushes provided practical application for the PES membranes with high surface properties.
研究领域:
材料科学
·
表面化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Tianheng Wang,Xiaoling Xu,Haisheng Zhang,Shaobin Wen,Liyuan Fan,Yanqiu Wang,Xinzhao Luo,Qiang Zhang,Yingquan Zou
Polyethylene is among the most widely-used coating materials due to the excellent physical and mechanical properties . However, the chemical inertness and poor solubility limit the application of polyethylene in coating. In this study, hyperbranched polyethylene-based graft copolymers containing functional oxetane groups (HBPE- g -POXMA) were synthesized via chain walking polymerization (CWP) and atom transfer radical polymerization (ATRP) in tandem. Macroinitiators were first synthesized via CWP of ethylene and trimethyl(undec-10-en-1-yloxy) silane following deprotection and esterification reaction. Subsequent ATRP of 3-ethyl-3-(methacryloyloxy) methyloxetane was performed to yield functional polyethylene with controlled molecular weight (MW), relatively narrow MW distribution, good solubility in organic solvents as well as pendant oxetane groups for photopolymerization . Finally, cationic photo-curing of HBPE- g -POXMA was conducted to build crosslinked polyethylene layers on polypropylene membrane surface. The composite membrane showed a narrow pore size distribution (0.03–0.63 μm) and an average pore size of merely 0.31 μm, which exhibited a retention ratio of over 90 % for different dyes. The strategy developed in this study could provide a synthetic route to hyperbranched polyethylene for functional coating via cationic photo-curing.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）