AUSTRALIAN JOURNAL OF CHEMISTRY
·
2022
·Vol. 75
·期 10
·820-834
·
IF 1.224
Haikuan Yuan,Cun Bao,Ruiran Hao,Jie Lu
A polyvinyl alcohol (PVA)/SiO2 organic-inorganic hybrid membrane was fabricated, using PVA as the basic material, SiO2 nanoparticles as the inorganic material, γ-(2,3)-glycidoxy propyl trimethoxysilane (GPTMS) and 3-aminopropyl triethoxysilane (APTEOS) as the second modified agents. The dehydration performance of PVA-SiO2/polyacrylonitrile (PAN) composite membrane to ethyl acetate (EA)/H2O, EA/ethanol (EtOH)/H2O and EA/EtOH/acetic acid (HAc)/H2O solutions was investigated. After modification of the second coupling agent of APTEOS or GPTMS, PVA-SiO2/PAN composite membrane had the better dehydration performance to these aqueous solutions. When dehydrating PVA-SiO2/PAN composite membrane modified by GPTMS (M5 membrane) in EA/H2O binary solution (98/2, wt%) at 40°C, the separation factor and the total permeation flux were 5245 and 293.9 g m−2 h−1, respectively. The preparation method of PVA/SiO2 membrane through adding the second coupling agent was simple, it had good dehydration performance and has excellent application prospects. The sorption behavior of PVA/SiO2 hybrid membrane was systematically studied, providing sufficient data for studying the separation mechanism of pervaporative membrane. The degree of swelling (DS) and the sorption selectivity of the membrane in different feed compositions and temperatures were measured to determine the static sorption of membrane. Dynamic sorption more clearly reflects the sorption and swelling processes of the membrane, and the dynamic sorption curves of the membrane in EA aqueous solutions were obtained. The sorption behavior of membrane to permeate components was studied by ATR-FTIR. Changes in the characteristic peaks for the permeate components and membrane indicated the sorption behavior of the membrane.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 13
·4177
·
IF 4.927
Yujian Zhang,Kuanjun Fang,Wei Wang,Haitao Niu
With the ever-growing concern about environmental conservation, green production and water-based nanofibers have attracted more and more interest from both academic and industrial fields; nevertheless, the stabilization process of water-based nanofibers is primarily relying on the application of organic solvent-based crosslinking agents. In this work, we develop a green approach to fabricate water-resistant polyvinyl alcohol (PVA) nanofibers by using a water-based epoxy compound, N1, N6-bis(oxiran-2-ylmethyl) hexane-1,6-diamine (EH), as the crosslinker. This EH/sodium carbonate/sodium bicarbonate (CBS) solution system can break down large aggregates of PVA molecules into small ones and promote the uniform distribution of EH in the solution, resulting in the improved stability of crosslinked PVA nanofibers. We firstly report that the uniform dispersion of crosslinking agents in the electrospinning solution plays a vital role in improving the stability of spinning solutions and the water resistance of crosslinked PVA nanofibers by comparing crosslinking performances between water-based epoxy and conventional water-based blocked isocyanate (BI). This work could open up a novel strategy and green approach for the stabilization of water-based nanofibers.Keywords:crosslinking;electrospinning;epoxy;polyvinyl alcohol;water resistance
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52049
·
IF 3.125
Xiangqian Jiang,Chuncheng Ban,Ling Li,Jiandong Hao,Ningqiang Shi,Weiping Chen,Peng Gao
In recent years, the thermoelectric properties of one-dimensional boron nitride nanomaterials have gradually attracted widespread attention of researchers in the world. In this paper, boron carbon nitrogen based composite nanofiber films were prepared by electrospinning. It is found that the diameter of nanofibers decreases in BCNNTs/PVA/PEDOT composite films when electrospinning voltage rises, while diameter increases as PVA and BCNNTs concentration increase of electrospinning precursor solution. Finally, thermoelectric power factor is investigated of the composite nanofiber films. It is verified that thermoelectric properties of the films closely related to electrospinning quality. However, fiber density of single-layer BCNNTs/PVA/PEDOT nanofiber film is too low, folding increase the density and thickness of multilayer BCNNTs/PVA/PEDOT nanocomposite fiber films, and the thermoelectric characteristics are significantly improved. The Seebeck coefficient can reach 3.62 mV/K and the power factor is 29.09 nW/mK 2 .
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高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Yun-Fei Zhang,Ming-Ming Guo,Ya Zhang,Chak Yin Tang,Can Jiang,Yuqing Dong,Wing-Cheung Law,Fei-Peng Du
Stretchable conductive hydrogels have received significant attention due to their possibility of being utilized in wearable electronics and healthcare devices. In this work, a semi-interpenetrating polymer network (SIPN) strategy was employed to fabricate a set of flexible, stretchable and conductive composite hydrogels composed of polyvinyl alcohol (PVA) in the presence of glutaraldehyde as the crosslinker, HCl as the catalyst and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) as the conductive medium. The results from FTIR, Raman, SEM and TGA indicate that a chemical crosslinking network and interactions of PVA and PEDOT:PSS exist in the SIPN hydrogels. The swelling ratio of hydrogels decreased with increasing content of PEDOT:PSS. Due to the chemical crosslinking network and interactions of PVA and PEDOT:PSS, PVA networks semi-interpenetrated with PEDOT:PSS exhibited excellent tensile and compression properties. The tensile strength and elongation at breakage of the composite hydrogels with 0.14 wt% PEDOT:PSS were 70 KPa and 239%, respectively. The compression stress of the composite hydrogels with 0.14 wt% PEDOT:PSS at a strain of 50% was about 216 KPa. The electrical conductivity of the hydrogels increased with increasing PEDOT:PSS content. The flexible, stretchable and conductive properties endow the composite hydrogel sensor with a superior gauge factor of up to 4.4 (strain: 100%). Coupling the strain sensing capability to the flexibility, good mechanical properties and high electrical conductivity, we consider that the designed PVA/PEDOT:PSS composite hydrogels have promising applications in wearable devices , such as flexible electronic skin and sensitive strain sensors.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Lian Yin,Dengdeng Xie,Kaili Gong,Congling Shi,Xiaodong Qian,Keqing Zhou
Phase change materials (PCMs) are considered ideal candidates for improving the efficiency of solar energy utilization because of their outstanding heat storage capacity. However, the further application of PCMs is limited by the issues of inferior shape stability, high fire hazard, and low thermal conductivity. Enlightened by the porous structure of coral in nature, a coral-like organic–inorganic graphene-modified PVA aerogel (GP) was designed as a host for PEG, resulting in a PCMs (P-GP) which has superior flame retardancy, shape stability, and solar-responsive thermal storage capacity. The thermal conductivity of P-G2.0P2.0 was significantly up, reaching 0.7545 W/(m·K), about 1.6 times that of PEG. As expected, the obtained P-G2.0P2.0 nanocomposites showed an ultrahigh thermal storage density (141.8 J) and an excellent shape stability. Additionally, the peak heat release rate and total heat release of the P-G2.0P2.0 were decreased by 37.5% and 25%, respectively, compared to those of PEG, showing superior fire safety. Due to the inorganic graphene acted as an effective light captor and molecular heated under solar light, the P-GP nanocomposites reached 50 °C within 80 s, indicating an efficient solar energy conversion, which have great potentials in solar energy storage and waste heat recovery.
研究领域:
材料科学
·
能源工程
·
仿生学
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yuhuan Xu,Meng Pei,Xiao Zhan,Jingyu Du,Daohai Zhang
MXene-based materials that effectively deal with harmful electromagnetic waves are attracting more and more attention. In this paper, MXene hydrogels with good properties were prepared using polyvinyl alcohol (PVA) and polyacrylic acid (PAA) to construct a three-dimensional framework for hydrogels, and then adding homemade MXene materials to take advantage of their excellent properties, which resulted in the formation of an electrically conductive framework. The study shows that MXene-10 has a tensile strength of 0.29 MPa and an electrical conductivity of 156.24 S/mm. In addition, electromagnetic shielding (EMI) of 33.6 dB can be achieved when the MXene hydrogel is only 2 mm.
研究领域:
材料科学
·
电磁学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zipan Jiao,Xinglan Zhou,Xiaoyan Lan,Haoran Zong,Yan Jing,Bingxin Liu,Peng Zhang,Benhua Xu
Graphite-phase carbon nitride quantum dots (g-C 3 N 4 QDs) have garnered widespread attention and considerable research interest as active media for resistive random-access memory (RRAM) devices owing to their exceptional physical properties. In this study, g-C 3 N 4 QDs were synthesized via ultrasonic-assisted liquid-phase exfoliation. Subsequently, the obtained g-C 3 N 4 QDs with uniform size were embedded into polyvinyl alcohol (PVA) for preparing PVA/g-C 3 N 4 QDs hybrid, and the RRAM devices with Al/g-C 3 N 4 QDs-PVA/ITO/PET structure were fabricated. The obtained memory devices exhibit bipolar resistive switching (BRS) behavior and are primarily influenced by the space charge limited conduction (SCLC) mechanism. The data retention time exceeds 10 4 s at a read voltage of 0.1 V, accompanied by an impressively low set voltage. In addition, the device exhibits a surprising temperature dependence of the resistive switching performance at different temperatures. The aforementioned properties demonstrate the significant potential of g-C 3 N 4 QDs in RRAM for data storage applications.
研究领域:
材料科学
·
电子工程
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高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Gui Juan Li,Hai Xi Luo,Wei Xia,Xue Feng Xu,Yu Zhang
Nano coir cellulose whiskersare materials abstracted from mesocarp of coconut shell which was modified by using KH570 as a coupling agent and modified nano coir cellulose whiskers need to be dispersed in chitosan/polyvinyl alcohol (CS/PVA) mixture solution. Because of regular structure and high crystallinity, nano coir cellulose whiskers could be applied in medical materials.In this paper, the results obtained with solution casting method by characterizing and analyzing structure, thermal properties, crystallization behavior and morphology of nano coir cellulose whiskers enhanced CS/PVA composite filmby FTIR, DSC, TG, XRD and SEM test. Different content of modified nano coir whiskers and CS/PVA composite film were preparedand themechanical properties of the composite film were also conducted. The results show that the tensile strength and Young's modulus of the CS/PVA composite film with modified nano coir whiskers are significantly improved, and Elongation break increases at first and then decreases, which indicates nano coir cellulose whiskers are good materials for medical purpose.
研究领域:
材料科学
·
生物医学工程
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2015
·
IF 4.152
Ruixia Hou,Lei Nie,Gaolai Du,Xiaopeng Xiong,Jun Fu
This paper aims to investigate the synergistic effects of natural polysaccharides and inorganic nanoparticles on cell adhesion and growth on intrinsically cell non-adhesive polyvinyl alcohol (PVA) hydrogels. Previously, we have demonstrated that Fe 2 O 3 and hydroxyapatite (nHAP) nanoparticles are effective in increasing osteoblast growth on PVA hydrogels. Herein, we blended hyaluronic acid (HA) and chondroitin sulfate (CS), two important components of cartilage extracellular matrix (ECM), with Fe 2 O 3 /nHAP/PVA hydrogels. The presence of these natural polyelectrolytes dramatically increased the pore size and the equilibrium swelling ratio (ESR) while maintaining excellent compressive strength of hydrogels. Chondrocytes were seeded and cultured on composite PVA hydrogels containing Fe 2 O 3 , nHAP and Fe 2 O 3 /nHAP hybrids and Fe 2 O 3 /nHAP with HA or CS. Confocal laser scanning microscopy (CLSM) and cell counting kit-8 (CCK-8) assay consistently confirmed that the addition of HA or CS promotes chondrocyte adhesion and growth on PVA and composite hydrogels. Particularly, the combination of HA and CS exhibited further promotion to cell adhesion and proliferation compared with any single polysaccharide. The results demonstrated that the magnetic composite nanoparticles and polysaccharides provided synergistic promotion to cell adhesion and growth. Such polysaccharide-augmented composite hydrogels may have potentials in biomedical applications.
研究领域:
生物材料学
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组织工程学
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细胞生物学
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PubMed
高影响因子
CARBON
·
2016
·
IF 6.198
Jiongrun Chen,Xuetao Shi,Li Ren,Yingjun Wang
In this article, graphene oxide (GO)/poly(vinyl alcohol) (PVA) inorganic/organic interpenetrating network (IPN) hydrogels with excellent mechanical properties and biocompatibility were reported. The hydrogels were synthesized using a freeze-thaw method with a modified GO network, which was crosslinked by β-cyclodextrin aldehyde (β-CD-DA) to form an inorganic GO network (β-GO). The structure of the hydrogels was characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X–ray photoelectron spectroscopy, transmission electron microscopy and scanning electron microscopy. The results from compression tests show that the compression modulus of β-GO/PVA hydrogels increased by 5.3-fold compared with pure PVA hydrogels at 3 mg ml −1 β-GO. The results of the tensile test showed a 2.5-fold increase in breaking elongation when the β-GO concentration reached 3 mg ml −1 . In biological tests, the β-GO/PVA hydrogels showed cytotoxicity levels as low as those of pure PVA hydrogels and controls. These results demonstrated that β-GO/PVA hydrogels could be promising substitutes for artificial articular cartilage.
研究领域:
材料科学
·
生物医学工程
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高影响因子
Frontiers of Materials Science
·
2021
·Vol. 15
·期 4
·632-642
·
IF 2.765
Li Chengxin,Gao Zhuwei,Liu Zhongxin
Solar thermal desalination (STD) is a promising and sustainable technology for extracting clean water resources. Whereas recent studies to improve STD performance primarily focus on interfacial solar evaporation, a non-traditional bottom heating method was designed in this study. Herein, we prepared the polyvinyl alcohol/graphene oxide (PVA-GO) composite membrane and adhered to the bottom of a beaker using crystallized PVA. The GO was loaded on a non-woven fabric and different concentrations of PVA were compared for their effect on the evaporation efficiency. The results showed that the addition of PVA increased the evaporation rate. The surface characteristic of GO membrane without PVA was a fibrous filamentous structure as observed by SEM, whereby the fibers were clearly visible. When the PVA concentration reached 6%, the non-woven fiber was completely wrapped by PVA. Under the action of a fixed light intensity, the photothermal conversion rates of GO, 2% PVA-GO, 4% PVA-GO and 6% PVA-GO membrane device could reach 39.93%, 42.61%, 45.10% and 47.00%, respectively, and the evaporation rates were 0.83, 0.88, 0.94 and 0.98 kg·m −2 h −1 , respectively. In addition, the PVA-GO composite membrane showed an excellent stability, which has significance for industrial application.
研究领域:
材料科学
·
环境科学
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Muhammad Irfan Jahanger,Sumair Ahmed Soomro,Maaz Ullah Khan,Yiwang Bao,Man Jiang,Longsheng Chu,Qingguo Feng,Chunfeng Hu
In this work, ultrathin, strong, and highly flexible Ti 3 C 2 T x MXene-PVA (Polyvinyl alcohol) composite films with varying Ti 3 C 2 T x MXene contents of 20, 40, 60, and 80 wt% were prepared via a solution casting method to evaluate their mechanical and electromagnetic interference shielding properties. The Ti 3 C 2 T x MXene-PVA composite films showed optimal mechanical properties with a Ti 3 C 2 T x MXene content of 60 wt%. At this composition, it achieved high tensile strength of 56.0 MPa, high fracture strain of 2.2%, and high Young’s modulus of 6.7 GPa. Additionally, the electromagnetic interference shielding efficiency was improved with increasing Ti 3 C 2 T x MXene content. At the loading of 80 wt% Ti 3 C 2 T x MXene, the electromagnetic interference shielding effectiveness reached the highest value of 34.80 dB.
研究领域:
材料科学
·
电磁学
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高影响因子
危险品化学品经营许可证（带存储）