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
·
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
·
高分子科学
·
水处理技术
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化学工程
·
材料科学
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DOI
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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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 19
·6488-6495
·
IF 7.059
Hui Peng,Bingsuo Zou,Yongchang Guo,Yonghao Xiao,Ruonan Zhi,Xiaoyue Fan,Min Zou,Jianping Wang
Due to the effects of electron correlation and spin–spin coupling, pure transition metal compounds rarely produce luminescence and ferromagnetism. In this work, the Pb-free perovskite materials, C8H20N2MnBr4 and C4H10NMnBr3 with high luminescence yields, were obtained via a simple mechanochemical process. In C8H20N2MnBr4 powders, MnBr42− coordinated with two pyrrolidine molecules to form an independent mononuclear structure in a crystal, with paramagnetic properties and a strong emission band at 520 nm due to the lowest d–d crystal field radiation transition for individual Mn(II) ions. In C4H10NMnBr3 powders, MnX64− octahedra, coordinated with a much smaller amount of pyrrolidine molecules than that in C8H20N2MnBr4, formed edge-sharing linear chains of Mn-ion octahedra with a much smaller Mn–Mn distance, which produced emission bands at 628 nm due to the ferromagnetic coupling of Mn pairs or clusters. Influenced by the modification in the local crystal structure by incorporated pyrrolidine molecules, the microcrystals in these two powders exhibited different phase transition temperatures and varied lifetimes in their photoluminescence besides their emission colors. By controlling the processing time of mechanochemical reactions and pyrrolidine amount, the pyrrolidine insertion into the lattice of this transition metal halide can be adjusted to be completely realized, which provides a very simple way to change the ligand from a halide ion to an organic molecule, which regulates the Mn–Mn distance in the lattice, modifying the electronic correlation and spin coupling, thereby obtaining new manganese perovskite compounds with both strong luminescence and clear ferromagnetic properties.
研究领域:
材料科学
·
化学
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DOI
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
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
JOURNAL OF ORGANIC CHEMISTRY
·
2018
·
IF 4.805
Xue-Juan Wang,Yan Su,Rui Li,Peiming Gu
A designed Tf2O-promoted intramolecular Schmidt reaction of 2-substituted ω-azido carboxylic acids was demonstrated. Tf2O was used as an activation reagent for the carboxylic acid, and ω-azido anhydride was in situ generated, releasing a molecular TfOH, which acted as an acid promoter for the Schmidt process. A series of 2-substituted pyrrolidines was produced and acetylated for better purification. The strategy was also efficient for conversion of a 4-substituted ω-azido carboxylic acid to the tricyclic lactam.
研究领域:
有机化学
·
合成化学
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DOI
PubMed
高影响因子
Defence Technology
·
2021
·
IF 3.172
Ling Liao,Bo Jin,Zhi-cheng Guo,Fei Xian,Chen-jie Hou,Ru-fang Peng
To explore the effect of different positions and number of pyrrolidine bound to the carbon cage on the stabilization effect of fulleropyrrolidine derivatives to nitrocellulose (NC)/nitroglycerine (NG), we synthesized N -(4-methoxy) phenylpyrrolidine-C 60 and four different of bis( N -(4-methoxy) phenylpyrrolidine)-C 60 compounds through Prato reaction. Their structures were characterized by UV–vis, 1 H NMR, 13 C NMR, high-resolution mass spectroscopy, and single-crystal X-ray diffraction. Their stabilization effect to NC/NG were investigated using differential scanning calorimetry, methyl violet, vacuum stabilization effect, weight loss, and accelerating rate calorimeter tests. The results indicated these compounds had excellent stabilization effect to NC/NG. The stabilization effect of the fulleropyrrolidine bisadducts to NC/NG is significantly better than that of fulleropyrrolidine monoadduct and C 60 . Moreover, the position where pyrrolidine binds to fullerene in fulleropyrrolidine bisadducts is different, and its stabilization effect to NC is also different. The stabilization effect order of different bisadduct isomers to nitrocellulose is as follows: e-edge > trans-2> cis-2> trans-3. Electron paramagnetic resonance (EPR) and FT-IR were used to study the stabilization mechanism of fulleropyrrolidine derivatives to NC/NG. The EPR results also show that fulleropyrrolidine bisadducts with different addition sites have different abilities to absorb nitroxide, and their ability is better than that of the monoadduct and C 60 , which is consistent with the results of stabilization effect performance test.
研究领域:
材料科学
·
化学工程
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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
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
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xiaoxia Liu,Yangyang Wang,Ronghao Liu,Ping Lv,Wenfeng Xue,Jinxin Guo,Huiying Wei,Yanzhao Yang
With environmental problems and a shortage of resources, it is urgent to recover gold from electronic waste (e-waste). Meanwhile, it is necessary to explore the relationships between the structures and extraction performances of ionic liquids (ILs) to further improve the extraction capacities of ILs for gold. Herein, three pyrrolidinium-based ILs with various N-substituents were synthesized for solvent-free extraction of Au(III). The three pyrrolidinium-based ILs exhibited ultrahigh extraction capacities for Au(III) with the order of [Pyr-EA][NTf2] (524.6 mg·g–1) > [Pyr-Bu][NTf2] (457.3 mg·g–1) > [Pyr-C2OC2][NTf2] (403.5 mg·g–1). The effects of N-substituents on extraction performances were quantitatively investigated by electrostatic potential (ESP) and quantitative NMR. Among them, the ester group (−COOR) is the most beneficial to the extraction process, which is associated with an increased ESP value and boosted hydrophobicity. Notably, [Pyr-EA][NTf2] displayed outstanding selectivity in multimetal solutions; especially, it could selectively and efficiently extract Au(III) from the actual CPU. Furthermore, [Pyr-EA][NTf2] possesses significant reuseability and can maintain superior extraction efficiency of 84.3% after five cycles. These excellent performances together with low cost ($0.44·g–1 [Pyr-EA][NTf2]) and considerable profit ($29.72·g–1 [Pyr-EA][NTf2]) confirmed that [Pyr-EA][NTf2] is a promising prospect for sustainable recovery of gold from e-waste.
研究领域:
环境科学
·
材料化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）