COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Dan Xue,Wen Wang,Longhai Piao,Mufang Li,Shuang Wang,Chenxue Xiang,Dong Wang
With the rapid development of electronic information technology, flexible transparent materials have been widely concerned and studied by researchers. Traditional transparent films have some problems in flexibility, transparency, or preparation method, which restrict their further development in scale production and application. Herein, we have developed a simple method by embedding the mass produced PVA- co -PE nanofibers into the PVP polymer matrix through photopolymerization method to produce a Polyvinyl Pyrrolidone/PVA- co -PE (PVP/NFs) composite film with high flexibility and transparency. Due to the nanoscale size and small refractive index contrast between nanofiber and PVP, the PVP/NFs composite film showed high light transmittance of 85.87%. In addition, the filling of PVA- co -PE nanofibers had a synergistic enhancement effect on the mechanical properties and thermal stability of PVP/NFs composite film. The tensile stress was as high as 16.6 MPa with a nanofiber content of 37.67 wt%, which was 4.05 times higher than that of the pure PVA- co -PE nanofiber film, and 2.81 times higher than that of the pure PVP film. Furthermore, the excellent flexibility of the PVP/NFs composite film enabled it to withstand a large-scale bending deformation under the action of external forces. The high flexibility, optical transparency and fast preparation made the PVP/NFs composite film a great application prospect in the intelligent electronic equipment and smart buildings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shumao Qi,Lu Xu,Haiyang Shao,Chen Huang,Lin Ma,Jiaguang Han,Xiaogang Xue,Mingjin Zhang,Hongjuan Ma
With the rapid expansion of the new energy industry and electronics market, the demand for lithium is growing rapidly, leading to a significant increase in the price of the metal. There has been great interest in lithium extraction from salt lakes. The powdered lithium ion-sieve (LIS) suffers from poor dispersion and difficult recovery. Composite polyvinyl alcohol (PVA) nanofiber mats with H 1.6 Mn 1.6 O 4 (HMO) were prepared by electrostatic spinning and radiation induced cross-linking. HMO was immobilized in the nanofiber mats by covalent attachment, cross-linking and entrapment. Hydrophilicity of PVA, high porosity of nanofiber and cross-linked 3D network endow the HMO/PVA nanofiber mats good mechanical strength, excellent Li + adsorption performance and long service life. 1/1-HMO/PVA nanofiber mats exhibit Li + adsorption capacity of 30.1 mg/g in salt-lake brine, which was superior to most LIS-containing adsorbents. Even in real salt-lake water with very low Li concentration of 15.45 mg/L and high Mg/Li ratio of 1260/1, the nanofiber mats have an excellent adsorption capacity of 24.2 mg/g and high distribution coefficient of 9713.34 mL/g, which was close to that of HMO powder. After ten adsorption and elution repetitions Li + adsorption capacity decreased less than 10%, which indicates the long-term stability of the HMO/PVA nanofiber mats. The loss rate of Mn is less than 5% and gradually decreases with the increase of the number of cycles. The present study demonstrates the potential application of HMO/PVA nanofiber mats for direct recovery of Li + from salt-lake especially in low-grade high Mg/Li ratio liquid lithium ore where holds a large proportion of the typical salt-lakes in China.
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
Food Chemistry-X
·
2024
·
IF 6.5
Qian Han,Min Yang,Zexin Zhang,Xinwen Bai,Xiuying Liu,Zhenhua Qin,Wei Zhang,Pingping Wang,Lijie Zhu,Zaixi Shu,Xuepeng Li
In this study, amine vapor-sensitive films with ratiometric fluorescence attributes were developed. The pH-sensitive fluorescein 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS) and its tetraphenylethylene derivative (TPB) were selected as ratiometric indicators and incorporated into a polyvinyl alcohol (PVA) matrix to produce HPTS/TPB-PVA films. The films responded well to amine vapors, and the interference of aromatic vapors did not substantially affect the fluorescence signals of the films. Under UV light at a wavelength of 365 nm, the fluorescence of the films changed from dark pink to light pink and finally to yellow when the freshness of the fish was visually checked during storage. In addition, the color difference values of the films showed a positive correlation with the total volatile basic nitrogen (TVB-N), ranging from 12.7 to 24.8 mg/100 g at 25 °C and 8.4 to 25.6 mg/100 g at 4 °C, respectively. This indicates that fluorescent films have good potential for quantifying fish freshness in the near future when connected to an automatic data processing system based on color differences.
研究领域:
食品科学
·
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 8
·1-20
·
IF 2.253
Khanam Zeba,Liu Jianghe,Song Shenhua
Herein, an efficient, facile, scalable production of graphene dispersions via exfoliation of graphite in an environment-friendly PVA/H 2 O solvent system is reported. To warrant the impact of processing parameters on exfoliation efficiency, a systematic investigation is carried out using UV–visible spectroscopy. Under the optimal shearing parameters (1 h, 10 k rpm) with the PVA-to-fed graphite mass ratio of 10, a high concentration graphene dispersion (3.36 mg mL −1 ) is achieved. The estimated graphene yield is found to be 33% that further increases to 90% after sediment recycling. With the aim of detailed quality analysis, centrifugal cascading is adopted to predominately sort the graphene flakes from the upper end of the distribution. Through various characterization techniques, it is confirmed that the resulting dispersion comprises high-quality graphene flakes (1–5 layers) having thickness up to 1.48 nm, lateral dimension ranging from 0.3 to 4 µm, and quite a low level of defects ( I D / I G = 0.1). The statistical distribution histogram reveals that most flakes are single-layer (41%), including some bi-layer (21%) and tri-layer (28%), while the remaining can be said five or multi-layer graphene. Meanwhile, the efficacy of the PVA/H 2 O solvent system is also demonstrated using ultrasonic exfoliation, providing a high concentration of graphene (1.1 mg mL −1 ) in a relatively short time (8 h). Furthermore, the applicability of the PVA-stabilized graphene dispersion is addressed by fabricating various graphene products such as graphene paper electrodes, graphene composites, and graphene thin films. Impressively, the graphene paper electrode imparts an exceptionally high specific capacitance of 199.63 F g −1 in a potential window range of 0 to 2 V, and hence could be a promising alternative to traditional electrodes in supercapacitors. Conclusively, the exfoliation of graphite in a green polymer–solvent system offers to produce highly concentrated graphene dispersions at a minimal cost that could be widely applicable in different research areas, thus holding the potential for commercial viability.
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
Food Bioscience
·
2024
·
IF 4.8
Xueyan Yun,Shuai Yuan,Shuo Shi,Yangyang Wang,Linze Liu,Lijun Song,Tungalag Dong
Amine-responsive fluorescent indicator films for meat freshness were constructed by incorporating β-glucan grafted with fluorescein isothiocyanate (FITC) in polyvinyl alcohol (PVA). The structural, thermal, and responsive properties of grafted copolymers (βGlu-FITC) were investigated. The results of 1 H NMR spectra showed that βGlu-FITC exhibited proton signals between 6.5 and 6.7 ppm, suggesting the successful grafting of FITC onto β-glucan. The fluorescence quantum yield of βGlu-FITC was 18.72%, which was higher than that of β-glucan of 12.94% at the optimum excitation wavelength of ultraviolet light of 365 nm. With the incorporation of PVA as a film-forming matrix, βGlu-FITC/PVA films showed high yellow-green fluorescent responsiveness under volatile ammonia and pH solution. When the film was used for meat freshness, the 0.06βGlu-FITC/PVA film provided a noticeable fluorescent indication of pork freshness that corresponded to increases in total volatile basic nitrogen, total colony counts, and drip loss, suggesting its potential for meat packaging and as a freshness indicator.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Jinmei Liu,Saixuan Li,Shuyi Zhou,Zijun Chen,Jiongyao Xu,Nuanyang Cui,Miaomiao Yuan,Bo Li,Long Gu
The emergence of biodegradable nanogenerators (BD-NGs) has provided a promising and safe approach for the development of biotransient medical electronics. However, the rapid advancement of these devices faces a major challenge due to the low output performance of BD-NGs. To address this issue, we develop a high-performance and fully biodegradable piezo-triboelectric hybrid nanogenerator (FB-HNG) for the first time. The FB-HNG is based on a sandwich-like heterostructured piezoelectric film composed of PVA/Gy/PVA. By utilizing an electric field-assisted water evaporation method to modulate the crystal process, a PVA/Gy/PVA film with enhanced piezoelectric properties (maximum d 33 of 9 pC/N) is prepared. The surface of PVA layer is designed to rub against a PLGA film, forming the triboelectric part, while the inner Gy bulk layer provides impressive piezoelectric output. Through the coupled effects of triboelectric and piezoelectric mechanisms, a maximum output voltage and current of 94 V and 2.3 μA are achieved, respectively. Notably, the current density of 1.53 μA/cm 2 and charge density of 6.53 nC/cm 2 of the FB-HNG are the highest among reported BD-NGs. Furthermore, the FB-HNG also presents excellent biocompatibility and biodegradability both in vitro and in vivo, which highlights its potential and prospects as a power source for transient medical devices .
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
能量收集
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·91-103
·
IF 5.693
Zhu Tengyang,Zhao Xiaoxu,Yi Ming,Xu Sheng,Wang Yan
To eliminate the interfacial defects between polymeric matrix and inorganic fillers in hybrid membranes, various strategies have been proposed by modifying membrane materials or optimizing membrane formation process. In this work, a ternary cross-linked PVA-APTES-ZIF-90 (PVA, poly(vinyl alcohol); APTES, 3-aminopropyltriethoxysilane; ZIF-90, zeolitic imidazolate framework-90) membrane was developed to eliminate interfacial defects between PVA and ZIF-90 for enhanced ethanol dehydration performance, where APTES served as a covalently linked bridge to cross-link PVA and ZIF-90 simultaneously. The morphologies and physicochemical properties of the resultant membranes were characterized by various characterization techniques. Moreover, we also explored the effects of [ZIF-90]/[APTES] mole ratio and [ZIF-90]/[APTES] loading on the separation performance of the trinity membranes. The results indicated that ZIF-90 particles showed better dispersion and compatibility in PVA-APTES-ZIF-90 trinity membranes than in PVA/ZIF-90 hybrid membrane, attributed to the ternary cross-linking among PVA, APTES, and ZIF-90. Compared with pristine PVA membrane, PVA-APTES-ZIF-90 trinity membranes showed stronger anti-swelling and mechanical properties, as well as more excellent separation performance, which resulted from the incorporation of cross-linker APTES and ZIF-90 particles. The separation factor of the optimal PVA-APTES-ZIF-90 trinity membrane was improved by 215.4%, up to 552, accompanied by a total flux of 82 g/m 2 h. Ternary cross-linking among cross-linker, inorganic filler, and polymeric chain is therefore believed to be a feasible strategy in preparing polymeric-based hybrid membranes with high separation performance. Graphical abstract Summary: A novel ternary cross-linked hybrid membrane with APTES as co-cross-linkers of ZIF-90 and PVA for efficient ethanol dehydration
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
Chinese Physics B
·
2018
·Vol. 27
·期 2
·027805
·
IF 1.321
Meng Du,Xing-Zhong Cao,Rui Xia,Zhong-Po Zhou,Shuo-Xue Jin,Bao-Yi Wang
The CS/PVA/Fe3O4 nanocomposite membranes with chainlike arrangement of Fe3O4 nanoparticles are prepared by a magnetic-field-assisted solution casting method. The aim of this work is to investigate the relationship between the microstructure of the magnetic anisotropic CS/PVA/Fe3O4 membrane and the evolved macroscopic physicochemical property. With the same doping content, the relative crystallinity of CS/PVA/Fe3O4-M is lower than that of CS/PVA/Fe3O4. The Fourier transform infrared spectroscopy (FT-TR) measurements indicate that there is no chemical bonding between polymer molecule and Fe3O4 nanoparticle. The Fe3O4 nanoparticles in CS/PVA/Fe3O4 and CS/PVA/Fe3O4-M are wrapped by the chains of CS/PVA, which is also confirmed by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis. The saturation magnetization value of CS/PVA/Fe3O4-M obviously increases compared with that of non-magnetic aligned membrane, meanwhile the transmittance decreases in the UV-visible region. The o-Ps lifetime distribution provides information about the free-volume nanoholes present in the amorphous region. It is suggested that the microstructure of CS/PVA/Fe3O4 membrane can be modified in its curing process under a magnetic field, which could affect the magnetic properties and the transmittance of nanocomposite membrane. In brief, a full understanding of the relationship between the microstructure and the macroscopic property of CS/PVA/Fe3O4 nanocomposite plays a vital role in exploring and designing the novel multifunctional materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhihui Chen,Jin Zhao,Wenjie Lv,Zhizhen Lv,Guoxin Li,Congshan Guo,Tingting Liu,Zeyi Meng,Jigui Tang,Jingshu Hui
Aqueous zinc-ion batteries have attracted widespread attention due to their low cost and high safety. Unfortunately, their commercial applications are greatly inhibited by the negative effects of zinc dendrites and side reactions. A solution that utilizes a 3D host can help mitigate these issues. In this paper, we present a 3D host that is composed of an aerogel scaffold with a poly(vinyl alcohol) and MXene structure. The embedded Zn can be densely packed inside the host due to its zincophilic properties. During cycling, the fluorine-based functional groups on the surface of MXene were able to react with the electrolyte to form the ZnF2 solid electrolyte interphase, which can effectively protect the composite anode. As a result, the symmetrical battery was capable of stable cycling for >300 h at a high current density of 10 mA cm–2. More impressively, the assembled full cell retained 93.86% after 800 cycles at a current density of 5 A g–1. This work provides an effective idea for improving the cycling performance of aqueous zinc-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 67
·54182-54187
·
IF 3.84
Zhiqiang Cheng,Fanli Zhang,Wei Liu,Liying Cui,Lijuan Kang
In this paper, we have prepared an antibacterial material of PVA/L-histidine (L-H)/Ag fibers by electrospinning in a double nozzle for the first time. The composite fibers were crosslinked by the mixture of glutaraldehyde and hydrogen chloride gas. After that, the fibers were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and FT-IR spectra. The results indicated the size of silver particles distributed on the fiber was in the nanoscale below 10 nm, and OH groups have significantly decreased but the CO groups increased after crosslinking treatment by the gas phase. Simultaneously, the mechanical property for the membrane also greatly improved and the maximum strain and toughness reached 225.01% and 11.31 J g−1 respectively. Lastly, in order to investigate the antibacterial property of the membrane, we chose E. coli and Staphylococcus as inhibition targets, which showed the excellent antibacterial property for blocking the growth and destroying the structure of the bacteria.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 21
·3778
·
IF 4.329
Siqi Chen,Hao Yang,Kui Huang,Xiaolong Ge,Hanpeng Yao,Junxiang Tang,Junxue Ren,Shixue Ren,Yanli Ma
In recent years, inverse gas chromatography (IGC) and molecular dynamics simulation methods have been used to characterize the solubility parameters and surface parameters of polymers, which can provide quantitative reference for the further study of the surface and interface compatibility of polymer components in the future. In this paper, the solubility parameters and surface parameters of two kinds of common alcoholysis, PVA88and PVA99, are studied by using the IGC method. The accuracy of the solubility parameters obtained by the IGC experiment is verified by molecular dynamics simulation. On the basis of this, the influence of repeated units of polyvinyl alcohol (PVA) on solubility parameters is studied, so as to determine the appropriate chain length of the PVA for simulation verification calculation. The results show that the solubility parameters are not much different when the PVA chain length is 30 and above; the numerical trends of the solubility parameters of PVA88and PVA99at room temperature are the same as the results of molecular dynamics simulation; the dispersive surface energyγsdand the specific surface energyγsspare scattered with the temperature distribution and have a small dependence on temperature. On the whole, the surface energy of PVA99with a higher alcoholysis degree is higher than that of PVA88with a lower alcoholysis degree. The surface specific adsorption free energy (ΔGsp) indicates that both PVA88and PVA99are amphoteric meta-acid materials, and the acidity of PVA99is stronger.Keywords:PVA;solubility parameter;IGC;alcoholicity;molecular dynamics simulation;surface properties
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Haoyuan Zhang,Jingxiao Liu,Fei Shi,Tianci Li,Haojie Zhang,Dayi Yang,Yi Li,Ziwei Tian,Ning Zhou
The photo-thermochromic materials with self-regulation of solar light transmittance have attracted a increasing attention because of its potential in smart windows and energy-saving field. Here, a novel bidirectional fast self-responsive PVA-PNIPAM/Li m Cs n WO 3 composite hydrogel has been fabricated by coupling the high near-infrared (NIR) shielding/photothermal effect of Li m Cs n WO 3 particles and thermally light-adjusting properties of polyvinyl alcohol-poly(N-isopropylacrylamide) (PVA-PNIPAM) hydrogels. Under solar irradiation, the photothermal effect of Li m Cs n WO 3 particles can drive the phase transition of PVA-PNIPAM hydrogel, thus the composite hydrogel exhibits bidirectional fast self-responsive spectral transmission/shielding switching function. When the Li m Cs n WO 3 (LCWO) particles doping amount is 1.67 × 10 −3 g/mL, the maximum NIR shielding rate of the sandwich structured smart window filled with the composite hydrogel can reach up to 99.77%, meanwhile the smart window can allow part of the visible light to enter the room for day lighting, with the visible light transmittance before and after its optical switching being 67.48% and 16.76%, respectively, and the simulated thermal insulation test results indicate that the thermal insulation temperature difference between external surface of the smart window and indoor air is 30 °C higher than that of ordinary hollow glass windows. Moreover, due to the high photothermal effect/NIR shielding of Li m Cs n WO 3 and specific heat capacity of PVA-PNIPAM hydrogel, the obtained smart window exhibits strong thermal insulation and heat storage capabilities. The photothermal solar transmittance self-regulation mechanism of the PVA-PNIPAM/Li m Cs n WO 3 composite hydrogel has been discussed. This research has a great significance for the development of high energy efficient smart windows.
研究领域:
材料科学
·
能源与环境科学
✓ 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）