JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 3
·2264-2270
·
IF 1.556
Chen Lian-Xi,Li Jie,Li Xi,Zhang Zhong-Min,Jiao Cai-Bin
In this work, a novel and facile strategy for making a new type of polymer/silica nanocomposte particle was proposed. Colloidally stable polyvinypyrrolidone (PVP)/silica core–shell nanocomposite particles have been successfully synthesized using an azo initiator via seed polymerization
of N-vinyl-2-pyrrolidone (NVP) and VFSs (VFSs) that were derived from vinyl triethoxysilane (VTES). It was suggested from the FTIR and TGA analysis that the copolymerization reaction of NVP with VFSs has been thoroughly carried out. In addition, SEM images showed that PVP/silica nanocomposite
particles have relatively rough surface due to surface polymerization in comparison with VFSs. Furthermore, TEM results proved that the size of VFSs had considerable effects on the appearance of PVP/silica nanocomposite particles. Generally, it presented that several silica nanoparticle cores
with an average size of 78 nm mainly pack together within each nanocomposite particle after seed polymerization. Interestingly, the average shell thickness was 59 nm for most PVP/silica nanocomposite particles with cores about 242 nm. However, when the core size was large enough to about 504
nm, a series of PVP/silica nanocomposite particles with a relative thin shell were observed.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Li Cuicui,Zhang Zhengyue,Wang Sibo
Iodine (I 2 ) is an attractive cathode for aqueous Zn batteries (AZBs) because of its high capacity, low cost, and environmental benignity. Nevertheless, the I 2 dissolution and the shuttling effect of polyiodide during charge–discharge processes seriously hinder the cycle stability and practical application of Zn-I 2 batteries. Herein, a water-soluble polyvinylpyrrolidone (PVP) polymer is proposed as a functional binder to address the above issues. The abundant polar groups in the PVP molecular chain serve as active sites, which can form a strong affinity with polyiodide ions, thereby effectively confining polyiodide species within the cathode. As a result, the PVP-based cathode achieves a capacity of 201 mAh g –1 at 0.1 A g –1 and retains 122 mAh g –1 at 5 A g –1 , which significantly outperforms the conventional polytetrafluoroethylene (PTFE) binder-based cathode that only delivers 176 and 100 mAh g –1 under the same current densities, respectively. Moreover, a long cycling stability of 20,000 cycles at 5 A g –1 with 97 mAh g –1 capacity was achieved. This work not only provides an efficient and low-cost strategy to mitigate the iodine shuttle problem but also sheds insights into the design of multifunctional polymer binders for high-performance Zn-I 2 batteries.
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MACROMOLECULAR BIOSCIENCE
·
2023
·Vol. 23
·期 11
·2300233
·
IF 4.6
Bing-Chiuan Shiu,Shihan Wulin,Qian-Yu Yuan,Ying Zhang,Zhicai Yu
In this study, lacquer is gathered from a lacquer tree and rotary evaporation is used to remove impurities to obtain urushiol. Next, 10 mL of anhydrous ethanol serves as the solvent for blending polyvinylpyrrolidone (PVP) at a specified content (0.7 g and 0.2–0.7 g urushiol) to form an electrospinning solution. Electrospinning is carried out with a voltage of 18 kV to prepare PVP/urushiol nanofibrous membranes. At a ratio of 7/4, the PVP/urushiol nanofibrous membranes are not eroded in 98% sulfuric acid and these membranes also demonstrate a 50–60% antibacterial effect against Staphylococcus aureus and Escherichia coli . Moreover, the antibacterial effect can be boosted to 98% with the incorporation of zinc ions. The results indicate that anhydrous ethanol can remove the sensitization of urushiol from PVP/urushiol membranes. Furthermore, animal test results indicate that when rats are in contact with PVP/urushiol anhydrous ethanol for 48 h, their skins are free from dark brown skin allergy. The presence of PVP eliminates the sensitization of urushiol, and the nanofibrous membranes demonstrate low toxicity. Hence, urushiol is the only natural material that enables PVP to withstand 98% sulfuric acid as well as acquire hydrolyzability, thereby qualify PVP as a medical material.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2022
·Vol. 20
·期 1
·1-18
·
IF 9.429
Xie Pei,Zhang Liying,Shen Hui,Wu Hang,Zhao Jiulong,Wang Shige,Hu Lianghao
Exogenous antioxidant materials mimicking endogenous antioxidant systems are commonly used for the treatment of oxidative stress-induced injuries. Thus, artificial enzymes have emerged as promising candidates for balancing and treating the dysregulation of redox homeostasis in vivo. Herein, a one-pot hydrothermal strategy for the facile preparation of MoSe 2 -polyvinylpyrrolidone (PVP) nanoparticles (NPs) is reported. The synthesized NPs were biodegradable due to their exposure to oxygen and exhibited high stability. Moreover, they effectively mimicked various naturally occurring enzymes (including catalase, superoxide dismutase, peroxidase, and glutathione peroxidase) and scavenged free radicals, such as 3-ethylbenzothiazoline-6-sulfonic acid, ·OH, ·O 2− , and 1,1-diphenyl-2-picrylhydrazyl radical. Further apoptosis detection studies revealed that MoSe 2 -PVP NPs significantly increased the cell survival probability in H 2 O 2 in a concentration-dependent manner. The cytoprotective effect of MoSe 2 -PVP NPs was explored for an animal model of acute pancreatitis, which confirmed its remarkable therapeutic efficacy. Owing to the biodegradable and biocompatible nature of MoSe 2 -PVP NPs, the findings of this work can stimulate the development of other artificial nanoenzymes for antioxidant therapies. Graphical Abstract
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 14
·2609-2615
·
IF 4.543
Shan Zhang,Jing Li,Erkang Wang
A facile, green and versatile method has been developed to prepare MoSe2 nanodots through polyvinylpyrrolidone (PVP)-assisted liquid phase exfoliation. The obtained nanodots showed a narrow size and thickness distribution. Moreover, these ultrasmall MoSe2–PVP nanocomposites could serve as efficient light-absorbing agent for photothermal therapy with negligible cell toxicity and appreciable photothermal effect.
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ORGANIC ELECTRONICS
·
2017
·
IF 3.399
Jiarong He,Jing Su,Jinglun Wang,Lingzhi Zhang
Poly (3, 4-ethylenedioxythiophene): tosylate (PEDOT: Tos) is synthesized by chemical oxidative polymerization with polyvinylpyrrolidone (PVP) as stabilizer in organic solvent . The effects of different molecular weight and additive amount of PVP stabilizer, various volume ratios of propylene carbonate (PC) to ethanol in organic system, different oxidative agents and various polymerization temperature/time on as-prepared PEDOT dispersion are taken into consideration and investigated systematically. Fourier transform infrared spectroscopy (FT-IR), film-forming property and electrical conductivity are studied and compared among different reaction conditions. The optimal polymerization scenario is to prepare PEDOT particles with 2 wt.% PVP (M.w. = 58,000) stabilizer and Fe 2 (SO 4 ) 3 oxidant at 80 °C for 24 h in organic system of PC and ethanol (volume ratio = 1: 3). Optimal PEDOT with PVP possesses more homogeneous particle size, better particle-particle connectivity in film and higher electrical conductivity (1.67*10 −2 s cm −1 ) than that of PEDOT without PVP (5.2*10 −4 s cm −1 ) and commercial organic PEDOT (4.7*10 −4 s cm −1 ). The morphology and elemental composition of PEDOT particles with PVP are also investigated and compared with that of commercial organic PEDOT and aqueous PEDOT/PSS dispersion.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Mengying Long,Luhui Yang,Tao Wu,Miaomiao Zhang,Shiyu Zhang,Dongmin An,Yu Zheng,Runnan Zhang,Zhongyi Jiang
In conventional interfacial polymerization (IP) for thin-film composite nanofiltration membranes , the separation layer is typically thick (∼100 nm), which limits its water permeance. In this study, we successfully synthesized an ultrathin polyamide layer (∼8.6 nm) from polyvinylpyrrolidone (PVP)-mediated IP. With the surfactant concentration over its critical micelle concentration , PVP not only formed a monolayer at the water-heptane interface, but also stayed in the aqueous solution. The C O groups of PVP formed the N–H⋯O hydrogen bond interactions with N–H bonds of piperazine (PIP) monomers in the aqueous phase to slow down the diffusion of PIP monomers. Besides, PVP with amphiphilic groups minimized the interfacial tension at the water-heptane interface to regulate IP processes. By adjusting the concentration of PVP, we obtained a sub-10 nm polyamide nanofiltration membrane. Moreover, hydrophilic PVP macromolecules improved the membrane surface hydrophilicity. Due to the ultrathin thickness and improved hydrophilicity, the optimized polyamide membrane demonstrated a threefold increase in permeance compared to that of the pristine polyamide membrane without PVP addition, and maintained 98.4% rejection for 1000 ppm Na 2 SO 4 solution. This study provides a new insight into fabricating sub-10 nm polyamide membranes for nanofiltration processes.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Xu Dejun,He Liu,Zeng Fudong,Liu Bo,Ma Jinli,Han Dongmei,Yang Qingbiao,Du Jianshi
Polyvinylpyrrolidone-iodine (PVP-I) complexes are widely used in the medical and health field due to its strong antimicrobial properties and good biocompatibility, but their water solubility negates the possibility to be used as a wound dressing. In this work, the problem of PVP dissolving in water was solved by the method of thermally crosslinking, and it was found that the thermally crosslinked PVP nanofiber heated at 170 °C for 6 h had good liquid absorption capacity, stability and good fiber morphology. In addition, the thermally crosslinked PVP nanofiber is complexed with I 2 to endow it with excellent antibacterial properties. It has been demonstrated to have good biocompatibility through cytotoxicity and hemolysis experiments, which provides the possibility for it to be a dressing for the treatment of infectious wounds.
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Advanced Sensor Research
·
2023
·Vol. 2
·期 6
·2200086
·
IF 0
Si Wang,Bohao Liu,Xingdong Feng,Rui Pan,Yuanlingyun Cai,Renyan Zhang,Mingbo Pu,Xiaoliang Ma,Xiong Li,Huiling Tai,Xiangang Luo
High flexibility, porosity, and antibacterial activity are extremely desired for wearable health monitoring, which is beneficial to simultaneously promote wearing comfort and safety. In this study, an antibacterial nanofibers-based triboelectric generator (AN-TENG) composed of the flexible chitosan/polyvinylpyrrolidone modified with halloysite nanotubes (CTS/PVP/HNTs) nanofibers and cube-arrays structured Ecoflex film is proposed for simultaneously energy harvesting and self-powered human motion monitoring. The open-circuit voltage (280 V), short-circuit current (3.98 μA), and transferred charge (51 nC) of the CTS/PVP/HNTs nanofibers TENG at the optimal compound concentration are increased by 90.8%, 86.92%, and 96.2%, respectively, compared to the CTS/PVP nanofibers one (size: 3 cm × 3 cm, mechanical force: 10 N @1 Hz), revealing good real-time monitoring ability for human wrist, elbow, and finger motion. An antibacterial test is carried out to evaluate the antibacterial activity and the antibacterial rate of the nanofibers against Escherichia coli (ATCC 8739) and Staphylococcus aureus (ATCC 6538) based on the current national standard GB/T 31402–2015, indicating good antibacterial properties of the nanofibers. This research offers an ingenious strategy to establish an antibacterial nanofibers-based TENG for self-powered motion monitoring and energy harvesting and offers a new insight to improve the practical security of wearable electronic devices.
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Nanomaterials
·
2020
·Vol. 10
·期 1
·125
·
IF 4.324
Quanguo He,Jun Liu,Jinxia Feng,Yiyong Wu,Yaling Tian,Guangli Li,Dongchu Chen
In this paper, an electrochemical method for the measurement of tryptophan (Trp) was developed based on a glassy carbon electrode modified with polyvinylpyrrolidonefunctionalized graphene (PVP-GR)/glassy carbon electrode (GCE). In 0.1 M phosphate buffer solution (PBS, pH = 2.2), compared with bare GCE, PVP/GCE, and GR/GCE, the oxidation peak current of Trp increased dramatically at PVP-GR/GCE. The oxidation mechanism of Trp on the PVP-GR/GCE was discussed and the experimental conditions were optimized. Under the best experimental conditions, the oxidation peak current of Trp was proportional to its concentration in the range of 0.06 µM–10.0 µM and 10.0–100.0 µM, and the limit of detection (LOD) was 0.01 µM (S/N = 3). The target modified electrode with excellent repeatability, stability and selectivity, was successfully applied to detectTrp in drugs and biological samples.
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JOURNAL OF PROSTHETIC DENTISTRY
·
2024
·
IF 4.3
Yaoxin Wang,Ning Ding,Zutai Zhang
Statement of problem Phosphoric acid is commonly used in dentistry as an etchant but can result in excessive demineralization of dentin, a major contributor to the instability of dentin-bonded restorations. Nevertheless, research on the development of etchants that can reduce acid damage is sparse. Purpose The purpose of this in vitro study was to investigate the effects of polyvinylpyrrolidone-modified phosphoric acid on the dentin bonding of an etch-and-rinse adhesive. Material and methods Protective etchants were prepared by adding polyvinylpyrrolidone to 35% phosphoric acid aqueous solutions: the 3 concentrations were 0.5% (P0.5% group), 1% (P1% group), and 2% (P2% group) w/v. The treatment agent of the control group (C) was 35% phosphoric acid gel. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), microhardness, microtensile bonding strength (µTBS), nanoleakage, and in situ zymography were used to evaluate the appearance of the protective etchant on dentin bonding. The results were analyzed with a 1-way ANOVA test (α=.05). Results SEM showed no obviously exposed collagen fiber in the P1% and P2% groups. FTIR showed less demineralization of the dentin surface, and microhardness was higher after treatment with the protective etchant ( P <.05). The µTBS of P1% (70 ±9.2 MPa) was the highest, and group C (44 ±5.8 MPa) was the lowest in all groups ( P <.05). Moreover, there was weaker MMP activity in the P1% and P2% groups ( P <.05). Conclusions This study demonstrated that the protective etchant effectively reduced demineralization, enhanced bond strength, and reduced nanoleakage and enzyme activity within the hybrid layer.
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Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 12
·3448-3454
·
IF 4.912
Jin Yan,Nan Li,Yuqian Ai,Zenggui Wang,Weichuang Yang,Min Zhao,Chunhui Shou,Baojie Yan,Jiang Sheng,Jichun Ye
Recently, perovskite solar cells (PSCs) have drawn a lot of attention due to their booming power conversion efficiency (PCE). However, the photovoltaic performance of PSCs is usually limited by the quality of the perovskite film. Here, trace polyvinylpyrrolidone (PVP) is introduced into the perovskite precursor solution as an additive for the crystalline defect passivation. The PVP with carbonyl delays the transition of the perovskite from the δ-phase to α-phase, which slows down the crystallization process. Thus, the crystallization rate of the α-phase perovskite can be controlled by forming coordination and a better film quality is achieved. As a result, we achieve a champion PCE of 19.63%, which is much higher than the 17.47% of the reference PSC. This study shows the mechanism of the material quality improvement by the additive during the perovskite film formation, where three processes are proposed to describe the film crystallization. We prove that the addition of PVP is an effective approach to improve the quality of the perovskite film, providing a valuable guidance for the development of high efficiency PSCs.
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