Materials
·
2020
·Vol. 13
·期 23
·5528
·
IF 3.057
Bolong Hong,Xiangming He,Huihua Yi,Chenglin Hu
LiMnBO3is a potential cathode for Li-ion batteries, but it suffers from a low electrochemical activity. To improve the electrochemical performance of LiMnBO3, the effect of polyvinyl pyrrolidone (PVP) as carbon additive was studied. Monoclinic LiMnBO3/C and LiMnBO3-MnO/C materials were obtained by a solid-state method at 500 °C. The structure, morphology and electrochemical behavior of these materials are characterized and compared. The results show that carbon additives and ball-milling dispersants affect the formation of impurities in the final products, but MnO is beneficial for the performance of LiMnBO3. The sample of LiMnBO3-MnO/C delivered a high capacity of 162.1 mAh g−1because the synergistic effect of the MnO/C composite and the suppression of the PVP coating on particle growth facilitates charge transfer and lithium–ion diffusion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 70
·期 1
·72-80
·
IF 1.547
Zhao Zhihua,Shen Xiaoqing,Yao Hongchang,Wang Jianshe,Chen Jinzhou,Li Zhongjun
Alumina nanofibers were fabricated by calcination of the polyvinylpyrrolidone (PVP)/pseudo-boehmite nanocomposite precursor fibers formed by electrospinning PVP/ethanol solution of dispersed pseudo-boehmite nanoparticles with and without additive of silica. The evolution of the phase, mechanical property and morphological features of the calcined fibers were studied and the effect of adding SiO 2 on the phase transformation of alumina was discussed. Adding SiO 2 can retard the phase transformation of γ-Al 2 O 3 to α-Al 2 O 3 and therefore inhibit the growth of alumina grains during calcination. Upon calcining the precursor fibers with 4 wt% SiO 2 additive at 1,300 °C, continuous alumina nanofibers with diameter ranging from 300 to 800 nm were obtained. These continuous nanofibers exhibited good flexibility and could be very promising for applications in filtration and catalyst support.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 45
·5819-5825
·
IF 2.378
Shunzhen He,Xi Lin,Hao Liang,Fubing Xiao,Feifei Li,Can Liu,Pengfei Fan,Shengyuan Yang,Yong Liu
As a priority pollutant in the environment, hexavalent chromium (Cr(VI)) has received increasing attention. In this work, a safe, simple, low-cost, effective and sensitive colorimetric strategy for the determination of Cr(VI) was introduced based on polyvinylpyrrolidone (PVP) functionalized silver nanoparticles (PVP–AgNPs). The prepared PVP–AgNPs had good dispersibility, and exhibited a state change from dispersed to aggregated when Cr(VI) was present in pH 5.5 PBS buffer due to the special and strong coordination between PVP and Cr(VI), accompanied by a color change from bright yellow to orange. Under the optimized conditions, the concentration of Cr(VI) in the range of 1.0 × 10−7 M to 2.4 × 10−6 M showed a good linear relationship with the ratio of the absorbance at 530 nm to that at 390 nm (A530 nm/A390 nm), and the limit of detection (LOD) was 34 nM. The method also showed good precision and high repeatability in determining Cr(VI) in real water samples such as pond water, tap water and river water. The recoveries ranged from 93.5% to 104.3%, indicating the method can be used for an extensive range of practical applications.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2024
·
IF 2.9
Yan Luo,Tengxiang Wang,Ke Yang,Taixiang Liu,Xue Bai
Keratoprosthesis (K-Pro) implantation and postoperative recovery often lead to severe ocular infections called keratoprosthesis-associated infections (KPAI). Antibiotics are commonly used; however, prolonged antibiotic use can lead to bacterial resistance and disrupt microbial balance in the eye. Borneol provides possibilities for developing antibiotic-independent antimicrobial K-Pro. Therefore, the development of an antibiotic-independent self-antimicrobial K-Pro is crucial for postoperative management. Herein, electrospinning technology was employed to fabricate a soluble borneol-based antibacterial coating on K-Pro surfaces for postoperative management of keratoprosthesis implantation. The modified K-Pro exhibited a distinctive nanofibrous morphology (100% borneol release ratio within 125 min), surface antibacterial properties (Escherichia coli: 2%, Staphylococcus aureus: 6%), biocompatibility, and negligible cytotoxicity towards epithelial cells. This study aimed to explore the potential application of camphor-based electrospun coatings in the field of K-Pro infection resistance, thereby providing novel strategies and material foundations for the effective postoperative management of KPAI.
研究领域:
生物医学工程
·
眼科医学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2011
·
IF 2.146
Yannan Xue,Xiaolei Ren,Xuefeng Zhai,Min Yu
Well-crystallized flower-like SrCO 3 :Tb 3+ phosphors have been synthesized by an inexpensive and friendly solvothermal process using polyvinylpyrrolidone (PVP, K30) as an additive without further annealing treatment. X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), and field emission scanning electron microscopy (FESEM) as well as photoluminescence spectroscopy (PL) were used to characterize the resulting samples. The amount of PVP and the reaction time have strong effect on the morphology of the SrCO 3 :Tb 3+ particles. The results of XRD confirm the formation of a well-crystallized SrCO 3 phase with an orthorhombic structure. The possible formation mechanism for flower-like SrCO 3 :Tb 3+ phosphor is proposed. The SrCO 3 :Tb 3+ phosphors show the characteristic 5 D 4 – 7 F J ( J = 6, 5, 4, 3) emission lines with green emission 5 D 4 – 7 F 5 (544 nm) as the most prominent group under ultraviolet excitation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
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
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yongwei Cai,Hong Yang,Jianxiang Li,Ronghua Gu,Yuhang Dong,Qi Zhao,Yao Chen,Yuanju Li,Ruru Wang
Catheter-associated urinary tract infections (CAUTI) account for 40% of all hospital-acquired infections and more than 1 million CAUTIs occur annually in the United States and Europe with increased morbidity and mortality. Although anti-bacterial coating is an effective way to solve this problem, so far only limitted progress has been made. In this paper we prepared a novel antibacterial silver nanoparticles poly(acrylamide)-chitosan-polyvinylpyrrolidone (AgNPs-PAAm-CS-PVP) composite hydrogel coating on latex urinary catheters by a simple dipping method. The average particle size, the size distribution as well as the polydispersity index (PDI) value of the AgNPs were examined by using TEM analysis. The surface morphology and roughness, the element contents, the functional groups, the static contact angles, and the surface energy of the coatings were characterized by using SEM, EDS, AFM, FTIR, XPS, and a video optical contact angle instrument, respectively. The amount of the total Ag released from the hydrogel was tested by ICP-MS. The antibacterial and antiadhesion efficacies against Gram-negative E. coli of the coated urinary catheters were evaluated with an inhibition zone test and fluorescence microscopy. A synergistic antibacterial mechanism of AgNPs and CS was also presented. The results showed that the synthesized AgNPs in the hydrogel had a spherical shape with an average diameter of 25.9 nm. The AgNPs-PAAm-CS-PVP hydrogel had a more durable release of the antibacterial agents of AgNPs and Ag + , which explains why the coated urinary catheters had long-term antibacterial activity. The mathematical modelling of Ag release kinetics supported Case I or Fickian diffusion mechanism for the AgNPs-PAAm-CS-PVP hydrogel. The hydrogel-coated urinary catheters became smoother and more hydrophilic which further explains why the coated urinary catheter decreased bacterial adhesion. More importantly, bacterial activity and bacterial adhesion assays showed that both the outer and inner surfaces of the AgNPs-PAAm-CS-PVP hydrogel-coated urinary catheters had strong antibacterial property against E. coli . Furthermore, the hydrogel-coated urinary catheters showed high hemocompatibility and cytocompatibility for promising biomedical applications. The AgNPs-PAAm-CS-PVP hydrogel-coated urinary catheters have great potential for decreasing CAUTIs.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
传染病学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 20
·6616-6626
·
IF 6.4
Xiangfei Xiao,Haidong Zhao,Penji Yan,Hengfei Zhang,Xinghuan Liu,Xin Jia,Shuping Jin
By exploring liquid-phase exfoliation in an imidazolium ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6), with the help of a two-step ultrasonic process, the high-yield few-layered black phosphorus (BP) flake with a thickness of 1.3–1.75 nm and a lateral size of 300–900 nm has been obtained. Afterwards, a transparent BP@PVP ionogel has been prepared through the photoinitiated polymerization of N-vinylpyrrolidone (NVP) in [BMIM]PF6 including BP flakes (0.2 mg g−1). The imidazole-containing polyvinylpyrrolidone (PVP) network structure endowed the BP@PVP ionogel with the ability to adhere to diverse surfaces and superior mechanical performance, including high tensile strength (≈1.43 MPa), large elongation (≈19 times), and high toughness (≈1868 MJ m−3). The BP@PVP ionogel can be assembled into a flexible and tough epidermal sensor to precisely monitor the diverse human body motions in real time; importantly, the sensor can tolerate a high temperature (100 °C) over 72 hours without any protection. The sensitive performance, robust interfacial adhesion, and thermal tolerance provide the BP@PVP Ionogel with potential for application in healthcare monitoring or human-computer user interfaces.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Wenyan He,Ruiqing Lu,Kuo Fang,Erfu San,Hui Gong,Kaijun Wang
To achieve ammonium recovery and organic matter enrichment simultaneously, a novel zeolite NaX-doped electrospun porous fiber membrane (Z-EPFM) was fabricated by using the electrospinning technique with the addition of polyvinylidene fluoride (PVDF), zeolite NaX and polyvinylpyrrolidone (PVP) as porogen. The strategy of using PVP as a pore-forming agent to obtain porous Z-EPMFs is more efficient to achieve ammonium adsorption than improving the hydrophilicity of the zeolite NaX-doped electrospun fiber membrane (Z-EFM) by simply adding PVP. As the molecular weight and content of PVP increase, the ammonium adsorption efficiency, hydrophilicity and membrane pore size of Z-EPFMs increase, while their mechanical strength decreases, which is due to the formation of pore structures . The most efficient Z-EPFM (zeolite NaX load density of 0.78 mg/cm 2 ) achieved 96.91% ± 0.50% ammonium adsorption efficiency and 95.48% ± 4.52% organic carbon enrichment efficiency, which were maintained steadily over five regeneration cycles. Therefore, the Z-EPFM offered a novel approach for simultaneous ammonium recovery and organic matter enrichment, which could be proposed as an efficient method to regulate energy flow and control nitrogen nutrient in municipal wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2016
·Vol. 87
·期 1
·67-74
·
IF 1.253
Wang Zhipeng,Li Mingrui,Huang Xiaoling
We reported the preparation of the poly( N -vinyl pyrrolidone)-b-polyethylene glycol (PVP-b-PEG) double-hydrophilic block copolymer by atom transfer radical polymerization (ATRP). The PVP-b-PEG samples were characterized by nuclear magnetic resonance spectroscopy and Fourier translation infrared spectrum. By taking advantage of its exceptional binding affinity, the perhydroxycucurbit[6]uril ((HO) 12 CB[6]) was used to interact with PVP-b-PEG by hydrogen bond and constructed micelle-like core–shell aggregates with the physical cross-link PVP segments as the core and the extending PEG chains as the outer palisade. The size of aggregates was about 50–300 nm. The particle size of this type of assemblies could be controlled by the weight content of (HO) 12 CB[6]. The size distribution was broad at high concentrations. The broad size distribution at high (HO) 12 CB[6] concentration was due to the coexistence of isolated particles and clusters. These novel micelle-like core–shell aggregates could be controlled by pH value. At pH lower than 6 or pH larger than 13, hydrogen bond interactions were destroyed and the formed (HO) 12 CB[6]-induced PVP-b-PEG assemblies could be destructed.
研究领域:
高分子化学
·
纳米材料科学
·
超分子化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Chen Dong,Xuehua Ma,Nianxiang Qiu,Yujie Zhang,Aiguo Wu
Monitoring pyrophosphate (PPi) in food is still a challenge due to lack of ultrasensitive, rapid, and selective analysis techniques. Herein, a smartphone-based colorimetric sensor based on anti-aggregation of polyvinylpyrrolidone (PVP) modified silver nanoparticles caused by Pb 2+ is reported, which lead to a color change from blue to yellow for accurate and reliable detection of PPi in water and canned meat. The smartphone-based colorimetric sensor exhibits high sensitivity with detection limits of 1.0 μM by naked-eyes and 0.2 μM by smartphone analysis. Confirmatory analysis indicates that the proposed smartphone-based colorimetric sensor exhibits feasibility and real time performance for PPi detection in real food samples. The first-principles calculations at the PBE/DNP + level indicate that the Gibbs free energy (ΔG) of the interaction between PPi and Pb 2+ is much higher than that between PVP and Pb 2+ , which effectively verified the anti-aggregation detection mechanism. This study provides a meaningful design strategy for the development of novel colorimetric sensors in the future.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2017
·Vol. 24
·期 1
·16-24
·
IF 0
Sun Jinsheng,Wei Dongmei,Lv Hao
This study focuses on shape-controlled synthesis of gold nanoparticles, using the green reducing agent l -Tryptophan ( l -Trp), which is non-toxic and eco-friendly. This specific agent was investigated to realize certain morphology controlling effects by changing the relative growth rates among various crystal planes. Experimental samples were characterized by transmission electron microscope, UV–Vis spectrophotometer and X-ray diffraction (XRD) for size and morphological information. The effects of the specific additives of PVP ((C 6 H 9 NO)
n
), CTAB (C 16 H 33 (CH 3 ) 3 NBr), and KBr were examined for their morphological control individually and synergistically in this system. Hexagonal gold nanoparticles were successfully obtained via the PVP/CTAB and PVP/KBr systems. Particular amounts of PVP/KBr produced various polyhedron structures, such as cubes, and others with triangular and rhombic straight-side cross sections.
研究领域:
材料科学
·
纳米生物学
·
环境科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）