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.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 1
·e70079
·
IF 3.4
Danni Yang,Tao Luo,Tao Zhang,Li Lv,Zongpeng Zou,Shengwei Tang
Ion exchange membranes of new chemistry based on polymer blends are proposed through a convenient solution-blending process using the hydrophobic commodity polymer polyvinyl chloride (PVC) and the hydrophilic polyvinylpyrrolidone (PVP), which are completely miscible. The pyrrolidone groups can be protonated to form oxonium ions, functioning as transient fixed positive charges for fractioning sulfuric acid and sulfates via diffusion. The influence of PVC molecular weight and the membrane composition on the physical, chemical properties, and mass transfer performance of PVC-PVP blend membranes was systematically investigated. After equilibrium in 2.68 mol/L sulfuric acid, the sulfuric acid, and water contents in the blend membranes increase with the increase of the membrane PVP contents (20–75 wt%). The permeability coefficients of sulfuric acid and ferrous sulfate for the blend membranes also exhibit a gradual increase. Membranes of mass transfer properties comparable to commercial ones can be easily obtained by tuning the membrane PVP contents. It is proved that the larger sulfuric acid permeability over sulfates (FeSO 4 as an example) is due to both larger solubility and diffusion coefficient of sulfuric acid in the membrane phase. The optimal PVC-PVP blend membranes have shown nice performance in fractioning sulfuric acid from sulfates, when treating titania waste acid. This study provides valuable guidance for the design of high-performance yet low-cost ion exchange membranes with pyrrolidone chemistry from commodity polymers for resource recovery.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhijiang Sun,Yumeng Wang,MeiMei Yu,Yuan Li,Dahui Wang,Zehua Yin,Fen Ran
Wastewater contaminants can be effectively removed using membrane separation technology, and polyacrylonitrile, a polymer with strong thermal and chemical durability, has been employed extensively in developing water treatment membranes. Typically, bare polymer membranes face numerous challenges, including low permeate flux and poor separation capacity, so researchers have used modification maneuvers such as adding polymers and inorganic and other modified materials as additives to overcome these challenges. However, the cost issues of membrane development, reproducibility, and whether they have the potential for large-scale industrial production are often overlooked. This study uses polyacrylonitrile as the polymer matrix, polyvinylpyrrolidone as the modifier, and 1-methyl-2-pyrrolidone as the solvent to prepare hybrid ultrafiltration membranes utilizing the impregnation-submerged phase transition method. A polymeric membrane with high permeate flux (pure water permeate flux up to 693.7 L m −2 h −1 ) and good separation ability (BSA retention up to 89.6%) can be made by altering the casting solution's polymer matrix and modifier ratio. The membrane made by scraping and coating it with this cast membrane solution using an automatic coating machine also maintains good reproducibility (pure water permeate flux up to 683.5 L m −2 h −1 and BSA retention up to 86.6%). These results suggest that changing the blending ratio of the cast membrane solution provides a relevant idea for developing polyacrylonitrile ultrafiltration membranes with industrialization prospects.
研究领域:
膜科学
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高分子科学
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水处理技术
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化学工程
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材料科学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2017
·
IF 4.529
Hua Zhou,Hai-Mei Li,Yang-Min Du,Ri-An Yan,Shi-Yi Ou,Tian-Feng Chen,Yong Wang,Li-Xin Zhou,Liang Fu
YingDe black tea is produced from crude tea prepared from leaves of Camellia sinensis var. assamica . In this work, we isolated and identified five novel flavanones, namely, amelliaone A – E ( 1 – 5 ), along with seven known compounds 6 – 12 from the ethanol extract of YingDe black tea. The structures of these five novel phenolic compounds were determined using extensive 1D and 2D nuclear magnetic resonance spectroscopy experiments. The compounds were further evaluated for antioxidant, α -glucosidase inhibitory, and cytotoxic activities. Compound 1 exhibited higher α -glucosidase inhibitory activity with a half-maximum inhibitory concentration value (IC 50 ) of 10.2 µM compared with acarbose (18.2 µM).
研究领域:
药理学
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生物化学
·
植物化学
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产品关联
DOI
PubMed
高影响因子
GIANT
·
2023
·
IF 7
Caihong Zhang,Weijie Wang,Pengfei Zhang,Shuguang Yang
Complexation between polymers of different species in a common solvent is a fundamental process in various applications such as functional polymeric membrane and drug delivery, yet the understanding of energetics, phase behaviors, and kinetics of polymer complexation is rather challenging partially due to the multi-component nature of the system. In this work, we investigate the hydrogen-bonding complexation of poly(acrylic acid) (PAA) and poly(vinylpyrrolidone) (PVPON) in different solvents, and identify a variety of phase states, including homogenous solution, solid precipitate, liquid–liquid separation, gelation, and kinetically trapped structures. Among different solvents, N -methyl-2-pyrrolidone (NMP) has a similar structure to the repeating unit of PVPON and the complexation in NMP almost has no heat, suggesting the process is driven by entropy. The PAA/PVPON-NMP system exhibits an upper critical solution temperature; specifically, as the temperature decreases, a homogeneous solution first becomes opalescent, then undergoes a liquid–liquid separation, and finally undergoes a liquid–gel separation. On the other hand, when the polymer concentration is above a threshold, a homogenous solution turns into a gel directly without involving liquid–liquid separation with decreasing temperature. Accordingly, we construct a temperature–concentration phase diagram that shows how the gelation interplays with coacervation. This work provides a broad vision on phase behaviors of polymer complexation.
研究领域:
高分子科学
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材料科学
·
物理化学
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产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 14
·3298
·
IF 3.267
Na Li,Liyan Liu,Huiqing Luo,Huaqiao Wang,Depo Yang,Feng He
Fluorophores with aggregation-induced emission enhancement (AIEE) characteristics applied in bioimaging have attracted more and more attention in recent years. In this work, a series of flavanone compounds with AIEE characteristics was developed and applied to fluorescence imaging of mitochondria and zebrafish. The compounds were readily prepared by the thermal dehydration of chalcone that was obtained by the reaction ofo-hydroxyacetophenone and benzaldehyde. Two of these compounds showed significant AIEE characteristics by fluorescence performance experiments, including optical spectra, fluorescence spectra, fluorescence quantum yield (φF), fluorescence lifetime, and scanning electron microscopy (SEM). Compared with traditional organic fluorescent dyes, these compounds have high fluorescence emission and high fluorescence quantum yield in solid or aggregated state, which overcomes the shortcoming of aggregation-caused quenching (ACQ). More importantly, the two compounds exhibited low cytotoxicity and good cytocompatibility in A549 lung cells at the experimental concentration range and they specifically targeted mitochondria, which make it of great potential use in mitochondria labeling. In addition, they were embryonic membrane permeable and had different affinities for different tissues and organs of zebrafish, but mainly distributed in the digestive system, providing a basis for the application of such compounds in bioimaging. These AIEE compounds with superior properties could be of great potential use in mitochondria imaging and other in vivo studies.Keywords:AIEE;flavanone;mitochondria;zebrafish
研究领域:
化学
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材料科学
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生物技术
·
生物学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Yanjing Li,Shilong Dong,Lili Wang,Xiaoyan Sun,Wenying Zhao,Shuguang Xiang
LLE data of cyclooctane/3-methylpentane + benzene/toluene + N -methylpyrrolidone (NMP) at 298.15 K and 313.15 K under a pressure of 101.3 kPa were measured in this work. The Othmer-Tobias and Hand equations were adopted to validate the reliability of LLE data, where the correlation coefficients ( R 2 ) were close to unity, indicating the high reliability of the experimental data. The experimental data were analyzed using the distribution coefficient ( D ) and separation factor ( S ), and the effect of NMP extracting benzene and toluene from aromatics was explored. Meanwhile, the reason for the different extraction efficiencies of benzene and toluene using NMP was analyzed by quantum chemical calculations. The NRTL and UNIQUAC thermodynamic models were used to correlate the liquid–liquid equilibrium data, and the relevant binary interaction parameters were obtained. The calculated root mean square deviation (RMSD) were all less than 0.0063, indicating that the obtained binary interaction parameters can be used to simulate and calculate the extraction of aromatics using NMP.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2013
·Vol. 2013
·期 32
·7411-7420
·
IF 3.344
Zhengkai Chen,Weijun Yang,Lijun Xu,Lili Zhang,Maozhong Miao,Hongjun Ren
Graphical Highly substituted 2-hydroxyflavanones can be obtained through a tandem O -arylation/hydroxylation process from triazenylaryl-substituted diketones in the presence of a Lewis acid. A transition-metal-free tandem O -arylation/hydroxylation approach has been developed for the efficient synthesis of highly substituted 2-hydroxyflavanones from triazenylaryl-substituted diketones. The intermediate benzopyrylium cation may be involved in these reactions.
研究领域:
有机化学
·
药物化学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 55
·33112-33118
·
IF 3.119
Su Ding,Qingfeng Cai,Jintao Mao,Fei Chen,Li Fu,Yanfei Lv,Shichao Zhao
Transient electronics have been widely researched to solve the electronic waste (E-waste) issue. Although various transient materials and devices have been reported, the fabrication technique for transient conductors always uses expensive sputtering or evaporation processes. In this study, a silver flake (AgF) and polyvinyl pyrrolidone (PVP) composite is prepared for conductive and transient tracks. The AgF/PVP composite tracks are highly conductive with a resistivity of 8.9 mOhm cm after sintering at 80 °C for only 3 minutes. Impressively, the AgF/PVP tracks disintegrate in water in 3 minutes due to the fast dissolution of the water-soluble PVP. The transient behavior of the AgF/PVP tracks has potential in transient electronics as demonstrated in a light emitting diode (LED) circuit and antenna.
研究领域:
材料科学
·
电子工程
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Yuyue Guo,Yangfei Hu,Xiaojiong Luo,Shudong Lin,Jiwen Hu,Yuan Liu
The modified polyol method for the production of high aspect ratio silver nanowires (AgNWs) has received significant attention from many researchers due to its convenience and simplicity. Poly(vinylpyrrolidone) (PVP) is generally used as a template and capping agent in this method to stabilize the nanowires. However, the influence of different PVP molecules on the growth mechanism of AgNWs is not well understood. Given this, we designed a series of orthogonal experiments to obtain nanowires with an aspect ratio of 2500 and investigated the influence of PVP on the growing process leading to AgNWs. According to the results and previous studies, we proposed that relatively long PVP chains are apt to bond strongly with Ag atoms through their numerous carbonyl groups and thus promote the formation of long AgNWs. While promoting the growth in the AgNW's length, this mechanism of action restricts the growth of the diameter, thus leading to the formation of thin AgNWs with high aspect ratios as the final products.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2015
·
IF 3.088
Ping Li,Longlong Wu,Binjie Li,Yanbao Zhao,Peng Qu
Highly water-dispersible silver sulfadiazine (SSD) was prepared by liquid phase method with polyvinyl pyrrolidone (PVP) as a surface modification agent. The structure and morphology of the PVP-modified silver sulfadiazine (P-SSD) were investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Fourier-transform infrared (FT-IR) spectrometry. The produced particles are ginkgo leaf-like architecture with the sizes of micron-nanometer. Due to hydrophilic PVP decorated on the surface, the P-SSD has excellent dispersion in water over a period of 24 h, which is obviously stable by comparison to that of the commercial silver sulfadiazine (C-SSD). In addition, the P-SSD exhibits good antibacterial activities against Escherichia coli ( E. coli ), Pseudomonas aeruginosa ( P. aeruginosa ) and Staphylococcus aureus ( S. aureus ).
研究领域:
材料科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Qiang Zhang,Jinxing Chen,Yunyun Xie,Mozhen Wang,Xuewu Ge
Bi 2 WO 6 has great potential applications in the field of photocatalyst due to its excellent visible-light photocatalytic performance. This work studied the detailed morphological evolution of Bi 2 WO 6 particles synthesized in a simple hydrothermal system induced by the stabilizer poly(vinyl pyrrolidone) (PVP). The XRD and HRTEM results show PVP would not change the crystal structure of Bi 2 WO 6 , but the distribution of PVP on the initially formed Bi 2 WO 6 nanosheets will induce the crystal growth, resulting in a distinct morphology evolution of Bi 2 WO 6 with the increase of the concentration of PVP. At the same time, with the increase of the molecular weight of PVP, the morphology of Bi 2 WO 6 varied from simple sheet-like (S-BWO) to some complicated morphology, such as flower-like (F-BWO), red blood cell-like (B-BWO), and square-pillar-like (SP-BWO). The photocatalytic performances of Bi 2 WO 6 with various morphologies on the decomposition of RhB under visible light irradiation reveal that S-BWO has the best photocatalytic performance, while SP-BWO has the worst. This work not only gives the explanation of the inductive effect of PVP molecular chains on the morphological formation of Bi 2 WO 6 particles, but also provides the controllable way to the preparation of Bi 2 WO 6 with various morphologies taking advantage of the stabilizer PVP.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）