RSC Advances
·
2013
·Vol. 3
·期 43
·20922-20929
·
IF 2.562
Jingjing Huang,Dong Wang,Ying Lu,Mufang Li,Weilin Xu
Antifouling nanofibers with zwitterionic materials on surfaces that can prevent the nonspecific adhesion of biomolecules and microorganism are in demand for high efficiency biosensors and affinity membranes. The functionalization of zwitterionic sulfobetaine on surfaces of PVA-co-PE nanofiber membrane via click chemistry is performed employing two synthesis routes and reported in this paper. PVA-co-PE nanofiber membranes were activated with cyanuric chloride, and then surface functionalized with sodium azide or 2-propynylamine to prepare “clickable” nanofibers with azide or alkynyl groups, respectively. The zwitterionic sulfobetaine was finally “clicked” onto PVA-co-PE nanofiber membranes. The successful surface functionalizations of PVA-co-PE nanofiber membrane were confirmed with FTIR-ATR, Raman spectroscopy, XPS and EDS. The analysis of element composition using XPS indicated that alkynylation of activated PVA-co-PE nanofiber membranes can “click” more sulfobetaines on nanofiber surfaces than surface azidation. SEM results showed that functionalized PVA-co-PE nanofiber membranes maintained well-defined nanofibrous morphology. PVA-co-PE nanofiber membranes with zwitterionic sulfobetaine demonstrated excellent antifouling performance by effectively resisting bovine serum albumin (BSA) protein adsorption.
研究领域:
材料科学
·
生物医学工程
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 12
·5825-5831
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IF 3.3
Cheng Zhou,Shengping Dai,Xiaoshuang Zhou,Hao Zhu,Guanggui Cheng,Jianning Ding
Inspired by the stimuli-responsive ability of biological, a variety of hydrogel have been prepared by stimulus, showing great application value in actuators, soft robots, etc. However, it is still challenging to prepare a toughness hydrogel by the way of stimuli-responsive. Herein, we constructed a novel dual-network structure PNIPAM/PVA hydrogel using reversible molecular configuration conversion of PNIPAM chains. Under the stimulus of ethanol, the elastic modulus of PNIPAM/PVA hydrogel can be increased by 47 times (5 times the change of the modulus of sea cucumbers’ tissue) and the stress can be six times of the original. The dynamic borate ester bond formed by the cross-linking of PVA and borax in the hydrogel enables rapid self-healing (η > 99%) within three minutes without external stimulus in the natural environment. In addition, PNIPAM/PVA hydrogels also showed outstanding underwater reversible thermokinetic properties (>25°) based on the hydrophilic/hydrophobic conversion of PNIPAM under thermal stimulation. The successful preparation of ethanol stimulus-enhancing self-healing PNIPAM/PVA hydrogel actuators, provides a new idea for the development of the soft underwater robots.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Liu Yang,Lixuan Ren,Yanzhen Zhao,Siqun Liu,Huifang Wang,Xianghua Gao,Baolong Niu,Wenfeng Li
In this study, arginineated chitosan (ACS) was used as a soft brain membrane and chelating agent to synthesize ACS-ZnO NPs, and then ACS and ACS-ZnO NPs were added to a polyvinyl alcohol (PVA) matrix as an antimicrobial agent to form films by casting. The formation and structural morphology of ACS and ACS-ZnO NPs were investigated by applying FTIR, 1 H NMR, XRD, EDS, SEM, and TEM techniques, and ACS has shown better water solubility. The cytotoxicity experiments of ACS and ACS-ZnO NPs on A549 cells showed that both had good cytocompatibility. The incorporation of ACS and ACS-ZnO NPs improves the composite film's mechanical properties, water barrier, and oxygen barrier and exhibits excellent antibacterial activities against S. aureus and E. coli . More importantly, in addition to extending the shelf life of cherry tomatoes, the composite film is also biodegradable to some degree. Therefore, polyvinyl alcohol films based on ACS and ACS-ZnO NPs added as antimicrobial agents have great potential for food packaging applications.
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chichi Ruan,Guanyu Chen,Yuanshneg Ma,Chunhua Du,Chunxiang He,Xinyu Liu,Xin Jin,Qilin Chen,Song He,Yajun Huang
Efforts to develop a green, inexpensive and effective adsorbent are crucial for eliminating antibiotics in polluted water. The sorption capacity of the as-prepared polyvinyl alcohol (PVA)-assisted cellulose nanocrystals/SiO 2 (CNCs/SiO 2 ) composite aerogel to ciprofloxacin (CIP) rises with the increase of temperature and initial concentration. Reverse trend of sorption capacity can be found when increasing the adsorbent dosage of adsorbent. The optimal pH value for the sorption is proved to be 4. It’s found in the uniaxial compression test that the maximum load that PVA-assisted aerogels can withstand is nearly 100 times than that of non-PVA aerogels. Sorption results confirm that the Pseudo-second order (R 2 = 0.9885) and Langmuir models (R 2 = 0.9959) fit well to sorption kinetics and equilibrium data, respectively. The rate constant differs from the initial concentration of CIP according to the Pseudo-second order model. The composite aerogel sorption capacity of Langmuir (q max ) for CIP was 163.34 mg·g −1 . The thermodynamic studies showed that the sorption process is endothermic with the value of enthalpy change of 41.032 kJ/mol. Hydrogen bonding , π–π interaction, hydrophobic and electrostatic interactions are the dominant mechanisms of CIP sorption by the PVA-assisted CNCs/SiO 2 composite aerogel.
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PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 5
·797
·
IF 5.719
Feipeng Wang,Zheng Zhang,Yuyang Yan,Zijia Shen,Qiang Wang,Reimund Gerhard
Tailoring the secondary surface morphology of electro-spun nanofibers has been highly desired, as such delicate structures equip nanofibers with distinct functions. Here, we report a simple strategy to directly reconstruct the surface of polyvinyl alcohol/polyvinylpyrrolidone (PVA/PVP) nanofibers by water evaporation. The roughness and diameter of the nanofibers depend on the temperature during vacuum drying. Surface changes of the nanofibers from smooth to rough were observed at 55 °C, with a significant drop in nanofiber diameter. We attribute the formation of the secondary surface morphology to the intermolecular forces in the water vapor, including capillary and the compression forces, on the basis of the results from the Fourier-transform infrared (FTIR) and X-ray photoelectron (XPS) spectroscopy. The strategy is universally effective for various electro-spun polymer nanofibers, thus opening up avenues toward more detailed and sophisticated structure design and implementation for nanofibers.Keywords:surface reconstruction;intermolecular force;surface-roughened nanofiber
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PubMed
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3723-3733
·
IF 7.704
Abdul Ghaffar,Cheng Chen,Xiaoying Zhu,Baoliang Chen
Accidental oil spills during oil exploration, production and transportation constitute a significant environmental threat, and thus remain a major challenge. Given that, common polymeric membranes often exhibit surface fouling, which limits their long term practical applications and makes it hard to recycle them with efficient flux stability and separation efficiency. Herein, we report a versatile porous structured polyvinyl alcohol (PVA) based nanofibrous membrane (NFM) with graphene oxide (GO), prepared by simple and straightforward electrospinning, to remediate oily water. The PVA–GO NFM was prepared keeping in view an effective pore geometry and selective wettability to facilitate oily water emulsion separation entirely under gravitational force, with a controlled GO ratio and compatibility to avoid aggregation, allowing easy spin ability. The morphology of the PVA NFM was completely changed in the presence of GO due to homogenous distribution with robust mechanical strength and outstanding thermal stability. As a result, the as-prepared PVA–GO NFM achieves a separation efficiency of above 99% for surfactant-free and surfactant-stabilized oily water emulsions with a water flux of approximately 45 and 30 L m−2 h−1, entirely under gravitational force due to the presence of GO. Furthermore, the PVA–GO NFM maintains its actual selectivity and surface wettability even after recycling, thereby allowing long term applications with almost the same separation efficiency and water flux. The present methodology for membrane fabrication is believed to be an effective energy saving filtration approach, with anti-oil property and reusability, and thus is promising for practical use in water purification and treatment processes, specifically for oily water remediation.
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ACS Omega
·
2021
·
IF 3.512
Zhen Shi,Yazhen Wang,Tianyuan Xiao,Shaobo Dong,Tianyu Lan
We have designed a new magnetic targeting drug carrier Fe3O4-PVA with a core of triiron tetroxide (Fe3O4) and a shell made of polyvinyl alcohol (PVA) to improve the hydrophilicity of Fe3O4. With adriamycin hydrochloride as a model drug, this study goes on to measure the drug carrier performance of Fe3O4-PVA. In addition, the thermal stability and enthalpy of thermal decomposition of Fe3O4-PVA were measured using a differential scanning calorimeter with a non-isothermal decomposition method. The kinetics of thermal decomposition of Fe3O4-PVA were also investigated. Over the course of this study, it was determined that the resulting drug carrier Fe3O4-PVA exhibited high drug loading levels and excellent release levels.
研究领域:
材料科学
·
药剂学
·
生物医学工程
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高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Hongjing Cheng,Zhaohua Yang,Feipeng Du,Hui Liu,Qiao Zhang,Yunfei Zhang
Recently, developing facile, cheap, and efficient nano‑silver catalysts for the reduction of waste 4-nitrophenol (4-NP) to useful 4-aminophenol (4-AP) has attracted more and more attention. In this study, a facile mechanical foaming method was used to fabricate Ag/halloysite nanotubes/polyvinyl alcohol sponges (Ag/Hal/PVA) for enhanced degradation of 4-NP. It included the preparation, morphology and composition characterization, and catalytic performance test of Ag/Hal/PVA. The morphology and composition of Ag/Hal/PVA were characterized by field emission scanning electron microscopy , Fourier transform infrared spectra , Raman spectra , X-ray photoelectron spectroscopy, thermo-gravimetric analysis, and XRD, respectively. BET and UV–vis spectrum measurements were used to test the adsorption and catalytic performance of Ag/Hal/PVA for 4-NP. The results showed that silver nanoparticles (AgNPs) were evenly distributed in the Hal/PVA sponge. Moreover, halloysite nanotubes (Hal) greatly improved the specific surface area and the loading capacity for AgNPs of the sponge due to the hollow tubular structure of Hal. The specific surface area of the Ag/Hal/PVA was about 1.62 m 2 /g. The obtained Ag/Hal/PVA exhibited a good catalytic activity and the apparent rate constant was 0.297 min −1 , and a good stability up to 5 cycles without a significant loss of its catalytic activity. This study provided a facile strategy for the development of cheap Ag/Hal/PVA sponges for high efficient reduction of 4-NP, which has potential application in the filed water treatment
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Membranes
·
2016
·Vol. 6
·期 4
·47
·
IF 0
Ningen Hu,Tonghu Xiao,Xinhai Cai,Lining Ding,Yuhua Fu,Xing Yang
In this study, a nonsolvent thermally-induced phase separation (NTIPS) method was first proposed to fabricate hydrophilically-modified poly(vinylidene fluoride) (PVDF) membranes to overcome the drawbacks of conventional thermally-induced phase separation (TIPS) and nonsolvent-induced phase separation (NIPS) methods. Hydrophilically-modified PVDF membranes were successfully prepared by blending in hydrophilic polymer polyvinyl alcohol (PVA) at 140 °C. A series of PVDF/PVA blend membranes was prepared at different total polymer concentrations and blend ratios. The morphological analysis via SEM indicated that the formation mechanism of these hydrophilically-modified membranes was a combined NIPS and TIPS process. As the total polymer concentration increased, the tensile strength of the membranes increased; meanwhile, the membrane pore size, porosity and water flux decreased. With the PVDF/PVA blend ratio increased from 10:0 to 8:2, the membrane pore size and water flux increased. The dynamic water contact angle of these membranes showed that the hydrophilic properties of PVDF/PVA blend membranes were prominently improved. The higher hydrophilicity of the membranes resulted in reduced membrane resistance and, hence, higher permeability. The total resistanceRtof the modified PVDF membranes decreased significantly as the hydrophilicity increased. The irreversible fouling related to pore blocking and adsorption fouling onto the membrane surface was minimal, indicating good antifouling properties.Keywords:nonsolvent thermally-induced phase separation (NTIPS);PVDF/PVA blend membrane;hydrophilic modification;membrane resistance;antifouling property
研究领域:
材料科学
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环境工程
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DOI
PubMed
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jingwen Lan,Yiming Gong,Baining Lin,Airong Xu,Rukuan Liu
Achieving high performance conductive hydrogel sensor which is capable of combining as many advantages as possible in one is highly desired to satisfy real-world tasks. To this end, novel hydrogel sensors PVA/NaDa (polyvinyl alcohol/D-Gluconic acid sodium salt) and PVA/NaLa (polyvinyl alcohol/L-Glutamic acid monosodium salt) have been successfully constructed via a facile and effective strategy. The hydrogels realize the combination of robust mechanical properties (stress, strain, elastic modulus, toughness, fatigue resistance, anti-breakage ability and recovery performance), excellent conductivity, sensitive sensitivity, rapid response capacity and high cytocompatibility. The increasing hydrogen bond cross-linking density and hydrogen bond interactions of NaDa (NaLa) with PVA are mainly responsible for significantly intensified mechanical properties of PVA/NaDa and PVA/NaLa hydrogels. Benefiting from the prominent performances, the hydrogels can be processed into flexible membrane sensors to not only effectively detect the human joint motions but also sensitively simulate manual control of the mobile phone screen for writing text, demonstrating a promising application in multifunctional intelligent robots, electronic skins, artificial intelligence and among others.
研究领域:
材料科学
·
传感器
·
生物医学工程
·
纳米技术
·
机器人
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人工智能
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Li Wang,Jie Hu,Yunxiao Liu,Jie Shu,Hao Wu,Zhaozhao Wang,Xiaolong Pan,Ning Zhang,Lijuan Zhou,Jianming Zhang
The surface functionalization of cellulose nanocrystals (CNCs) is of significant importance for promoting its diverse applications. However, the efficient strategy reported so far for cation functionalization of CNCs remains limited owing to the electrostatic attraction between cationic modifiers and electronegative CNCs. Herein, a cationized CNC (CNC-LA-IL) has been successfully prepared in aqueous media by grafting the [VBIm][BF4], a kind of ionic liquid (IL), on the surface of a sulfated CNC using lactic acid (LA) as a linker molecule. This surface functionalization not only converts the negative charge of CNC suspensions to a positive charge (zeta potential reversed from −35 to +40 mV) but also leads to enhanced thermal stability and redispersibility of the dried CNC. To examine the reinforcing effect of IL-modified CNCs, poly(vinyl alcohol) (PVA)/CNC-LA-IL nanocomposite films were further prepared by the solution casting method. To one’s surprise, the as-prepared PVA/CNC-LA-IL films exhibit extraordinary improvement in both the tensile strength (92%) and the toughness (166%) with only a 0.3 wt % CNC loading. This study provides a green and facile method to achieve ionic liquids grafted CNCs for high-performance nanocomposites.
研究领域:
材料科学
·
化学工程
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Man-Ke Zhang,Xiao-Hui Zhang,Guo-Zhi Han
Through reverse emulsion method and ion crosslinking along with coprecipitation, we develop a novel kind of magnetic composite alginate/PVA hydrogel microspheres with interpenetrating network (IPN) under mild conditions. Compared with traditional magnetic alginate hydrogels, coupling of polyvinyl alcohol endow the magnetic alginate hydrogels with IPN structure and corresponding excellent stability. Furthermore, the magnetic alginate/PVA hydrogel microspheres show good selective adsorption for hydrophilic aromatic compounds in aqueous solution. Especially, based on the pH sensitivity of alginate, the as-synthesized magnetic alginate/PVA hydrogel microspheres display different selective adsorption properties for aromatic compounds with change of pH over a wide range, which is conducive to application under different environmental conditions for the hydrogel material. This research provides a simple strategy for large-scale preparation of stable magnetic hydrogel microspheres, and has long-term application potential in water environmental treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
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DOI
高影响因子
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