Journal of Functional Biomaterials
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2022
·Vol. 13
·期 4
·195
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IF 4.901
Yikai Wang,Wangsiyuan Teng,Zengjie Zhang,Siyuan Ma,Zhihui Jin,Xingzhi Zhou,Yuxiao Ye,Chongda Zhang,Zhongru Gou,Xiaohua Yu,Zhaoming Ye,Yijun Ren
Bacteria-associated late infection of the orthopedic devices would further lead to the failure of the implantation. However, present ordinary antimicrobial strategies usually deal with early infection but fail to combat the late infection of the implants due to the burst release of the antibiotics. Thus, to fabricate long-term antimicrobial (early antibacterial, late antibacterial) orthopedic implants is essential to address this issue. Herein, we developed a sophisticated MAO-I2-PCLx coating system incorporating an underlying iodine layer and an upper layer of polycaprolactone (PCL)-controlled coating, which could effectively eradicate the late bacterial infection throughout the implantation. Firstly, micro-arc oxidation was used to form a microarray tubular structure on the surface of the implants, laying the foundation for iodine loading and PCL bonding. Secondly, electrophoresis was applied to load iodine in the tubular structure as an efficient bactericidal agent. Finally, the surface-bonded PCL coating acts as a controller to regulate the release of iodine. The hybrid coatings displayed great stability and control release capacity. Excellent antibacterial ability was validated at 30 days post-implantation via in vitro experiments and in vivo rat osteomyelitis model. Expectedly, it can become a promising bench-to-bedside strategy for current infection challenges in the orthopedic field.Keywords:antibacterial coating;micro-arc oxidation;orthopedic implants;polycaprolactone;povidone-iodine
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Membranes
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2022
·Vol. 12
·期 2
·189
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IF 4.562
Peng Qi,Hongge Jia,Shuangping Xu,Qingji Wang,Guiming Su,Guoxing Yang,Mingyu Zhang,Yanqing Qu,Fuying Pei
In this paper, superhydrophilic polyimide (PI) membranes were prepared using the electrostatic spinning method, capped with a hydrophilic ionic liquid (IL), and blended with polyvinylpyrrolidone (PVP). Using this preparation, the surface of the fiber membranes was coated in polydopamine (PDA) by means of an in-growth method. Scanning electron micrographs showed prepared blend films can form continuous fibers, for whom the distributions of diameter and pore were uniform. Post-modification (carried out by adding hydrophilic substances), the ability of the membrane surface to adhere to water was also significantly improved. The water contact angle was reduced from 128.97 ± 3.86° in unmodified PI to 30.26 ± 2.16°. In addition, they displayed a good separation effect on emulsified oil/water mixtures. The membrane flux reached a maximum value of 290 L·m−2·h−1, with a maximum separation efficiency reached of more than 99%. After being recycled 10 times, the separation efficiency maintained a level exceeding 95%. The purpose of this study is to demonstrate the simplicity and efficiency of this experiment, thereby providing new ideas for the future application of membrane separation technology in wastewater treatment.Keywords:polyimide;membrane;electrospinning;ionic liquid;oil-water separation fiber;polydopamine;polyvinylpyrrolidone
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ACS Omega
·
2023
·
IF 4.1
Zhijiang Sun,Zehua Yin,Mingyu Zhang,Dongli Guo,Fen Ran
At present, the design and fabrication of polymer membranes with high permeability and good retention ability are still huge challenges. In this study, the commercial Poloxamer 407 (Pluronic F127) is selected as a multifunctional additive, and polyvinylpyrrolidone is used as a pore-forming agent to modify the poly(ether sulfone) membrane by liquid–liquid phase conversion technology to prepare an ultrafiltration membrane with excellent performance. The hydrophobic poly(propylene oxide) segment in Poloxamer 407 guarantees that this copolymer can be firmly anchored to the poly(ether sulfone) matrix, and the hydrophilic poly(ethylene oxide) segments in Poloxamer 407 impart a stronger hydrophilic nature to the modified membrane surface. Therefore, the permeability and hydrophilicity of the modified membrane are significantly improved and the modified membrane also has good stability. When the amount of Poloxamer 407 added to the casting solution reached 0.6 g, the water flux of the modified membrane was as high as 368 L m–2 h–1, and the rejection rate of bovine serum albumin was close to 98%. In the test to isolate organic small molecule dyes, the retention rate of the modified membrane to Congo red is 94.27%. In addition, the modified membrane shows an excellent water flux recovery rate and antifouling ability. It performs well in subsequent cycle tests and long-term membrane life tests and can be used repeatedly. Our work has resulted in poly(ether sulfone) membranes with good performance, which show great potential in the treatment of biomedical wastewater and the removal of industrial organic dye wastewater, it provides ideas for the development and application of amphiphilic polymer materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Shuchun Yu,Xiaojin Li,Jinkai Hao,Sa Liu,Zhigang Shao,Baolian Yi
A new method of preparing microporous layer (MPL) for proton exchange membrane fuel cell (PEMFC) was presented in this paper. Considering the bad dispersion of PTFE aqueous suspension in the carbon slurry based on ethanol, polyvinylpyrrolidone (PVP) aqueous solution was used to prepare carbon slurry for microporous layer. The prepared gas diffusion layers (GDLs) were characterized by scanning electron microscopy, contact angle system and pore size distribution analyzer. It was found that the GDL prepared with PVP aqueous solution had higher gas permeability , as well as more homogeneous hydrophobicity . Moreover, the prepared GDLs were used in the cathode of fuel cell and evaluated with fuel cell performance and EIS analysis, and the GDL prepared with PVP aqueous solution indicated better fuel cell performance and lower ohmic resistance and mass transfer resistance.
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ELECTROCHIMICA ACTA
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2024
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IF 5.5
Shao-Kang Deng,Jin-Tao Jiang,Tsung-Lin Tsai,Xin-Hua Xu,Li-Hua Cheng
The crystal facet of PbO 2 has been proved to be a key factor affecting its electrochemical ozone production (EOP) performance. However, PbO 2 with smooth and uniform crystal surface and single-crystal nature, which is the basis and prerequisite for PbO 2 crystal facet engineering, has not yet been reported. In this study, by adding polyvinylpyrrolidone (PVP) as a facet modifier during the hydrothermal synthesis, a quasi-single-crystal PbO 2 (PVP:Pb(CH 3 COO) 2 ·3H 2 O=48:100, PVP-48) with (110) and (101) exposed facets was successfully synthesized. Compared with commercial PbO 2 prepared by electrochemical deposition, PVP-48 exhibits excellent electrochemical catalytic activity due to its special crystal structure, and achieves the highest current efficiency of 11.9 % at a current density of 0.83 A/cm 2 . Further calculations show that PVP prefers to adsorb onto the (110) facet of the lead dioxide and reduces its surface energy, thereby exposing the (110) facet more readily. This work demonstrates the importance of PbO 2 facets composition and provides new ideas for further controllable synthesis of PbO 2 with specific facet structure and higher EOP efficiency.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yue Cao,Yanchen Wang,Xin Zhang,Bo Ren,Bo Wang,Xiaodong Yang
Due to the heterogeneity of the tumor, it is difficult to achieve complete ablation of the tumor by single photothermal treatment. Moreover, their broader use is constrained by the intrinsic high uptake in the reticuloendothelial system (RES) organs, resulting in slow elimination from the body and potential toxicity. In this study, we report a single-step synthetic approach to fabricate versatile FeCP-NPs, leveraging the coordination bonds formed between bioactive polyphenolic compounds (curcumin), Fe III ions, and polyvinyl pyrrolidone (PVP). The FeCP-NPs possess the following favorable characteristics: (1) The components of FeCP-NPs originate from natural products, an endogenous element, and an FDA-approved polymer, guaranteeing good biosafety. (2) FeCP-NPs exhibit excellent photothermal properties. (3) After the photothermal treatment is completed, the dynamic disassembly strategy triggered by deferoxamine mesylate (DFO) can induce the dissociation of nanoparticles and achieve rapid clearance in vivo. (4) Curcumin released during the disassembly of FeCP-NPs can be combined with photothermal therapy to achieve complete tumor ablation. A comprehensive analysis of the safety, biodistribution, and clearance patterns of FeCP-NPs is conducted in vitro or in vivo. This work provides a nanoparticle with great clinical translational potential and provides a new solution for inhibiting tumor growth.
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JOURNAL OF HAZARDOUS MATERIALS
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2011
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IF 3.723
Hua Chen,Hanjin Luo,Yuecun Lan,Tingting Dong,Bingjie Hu,Yiping Wang
The interactions of tetracycline (TC) with nanoscale zerovalent iron (NZVI) modified by polyvinylpyrrolidone (PVP-K30) were investigated using batch experiments as a function of reactant concentration, pH, temperature, and competitive anions. Transmission electron micrographs (TEM), BET surface area and Zeta (ζ)-potential analyses indicated that the mean particle size was 10–40 nm with a surface area of 36.90 m 2 /g, and a iso-electric point of PVP-NZVI was 7.2. The results of X-ray diffraction (XRD) and high-resolution X-ray photoelectron spectroscopy (HR-XPS) of modified nanoscale zerovalent iron (PVP-NZVI) revealed that the iron nanoparticles likely have a core of zero-valent iron (Fe 0 ), while a shell is largely made of iron oxides . Degradation of TC was strongly dependent on pH and temperature. The presence of silicate and phosphate strongly inhibited the removal of TC, whereas acetate and sulfate only caused slight inhibition. LC–MS analysis of the treated solution showed that the degradation products from TC resulted from the removal of functional groups from the TC ring. The degradation products were detected both in the treated solution (initial pH of 3.0 and 6.5) and on the surface of PVP-NZVI after 4-h interaction, indicating that PVP-NZVI can adsorb both TC and its degradation products.
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IONICS
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2025
·
IF 2.6
Dong Shiyu,Fan Yutong,Wang Fuhai,Shen Chunhui,Gao Shanjun
While ether-free anion exchange membranes (AEMs) have demonstrated enhanced alkaline stability, the simultaneous enhancement of hydroxide conductivity and dimensional stability remains a challenging aspect to address. This study proposes a reductive amination strategy for synthesizing cross-linked polyvinylpyrrolidone (PVP)-based AEMs. The strategy involves controlled molecular weight variation (K16, K30, and K60) and alkylamine functionalization. The employment of n-propylamine, 3-(Dimethylamino)propylamine (DMAPA), and hexadecylamine in conjunction with a 1,6-dibromohexane cross-linker has enabled the systematic tailoring of membrane architectures. The K16-PVP grafted with DMAPA demonstrated the highest grafting degree, as confirmed by FT-IR and 1 H NMR analyses, and exhibited enhanced cross-linking density. This synergy resulted in a significant improvement in ion transportation and mechanical stability. The optimized membrane performed exceptionally, with 94.15 mS·cm −1 of hydroxide conductivity at 80 °C, surpassing PVP-based AEM reports, while still maintaining 85.3% conductivity after 240 h in 2 M NaOH at 80 °C. These results establish molecular weight-controlled reductive amination as an effective approach to resolve the critical conductivity-stability trade-off in anion exchange membranes. Graphical
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Journal of Energy Storage
·
2021
·
IF 6.583
Xue-Feng Shao,Sheng Yang,Jia-Cheng Lin,Hao-Ran Teng,Li-Wu Fan,Justin NingWei Chiu,Yan-Ping Yuan,Viktoria Martin
The supercooling effect is deemed to be a crucial issue for thermal energy storage using phase change materials (PCMs). The exploration of promising additives plays a decisive role in effective suppression efforts for suppressing the supercooling effect of a PCM. The present work proposed a potential additive, polyvinylpyrrolidone (PVP), to reduce the supercooling of erythritol, which is the most promising polyol PCM candidate for medium temperature range. PVP with various loadings was dispersed in erythritol to make composites for the proof-of-concept tests. It was shown that the degree of supercooling of erythritol can be reduced significantly from over 64 °C to about 21 °C in the presence of only 1.0 wt.% PVP. Along with the mitigated supercooling effect, the addition of PVP also leads to an increase of the retrievable latent heat during crystallization, from ∼187 J/g to ∼224 J/g at the same minute PVP loading of 1.0 wt.%, by increasing the crystallinity of erythritol. The PVP-loaded erythritol composites exhibit little sacrifice in latent heat of fusion, i.e., only ∼15% loss when the PVP loading reaches 6.0 wt.%. In addition, multiple tests confirmed that PVP can be dissolved in erythritol, thus desirable compatibility was obtained and the composites would have long-term reliability. This proposed additive enables an efficient and cost-effective way for improving the crystallization behaviors of erythritol (and other polyol PCMs) towards real-world applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Muzammal Hussain,Mulenga Kalulu,Zaheer Ahmad,Onome Ejeromedoghene,Guodong Fu
Ethyl cellulose (EC), polyvinylpyrrolidone (PVP), and phosphomolybdic acid (PMoA) were the components of a new photochromic hybrid film composed of heteropoly acids (abbreviated EC-PVP/PMoA), created by solvent evaporation. The EC-PVP/PMoA mechanism, visible light photochromic behaviors, and microstructure were closely studied by transmission electron microscopy (TEM), atomic force microscopy (AFM), ultraviolet-visible (UV–visible) spectroscopy, X-ray photo electronics (XPS), and Fourier transmission infrared spectroscopy (FTIR). FTIR spectra show that neither the core structures of EC, PVP, nor the Keggin structure of PMoA in the EC-PVP/PMoA composite hybrid film were damaged during fabrication. In the presence of oxygen, the yellowish transparent hybrid film exhibited reversible photochromism and significant photochromic reactivity, becoming blue in the presence of visible light. Upon heating the film at 90 °C for 1 h its photoresponsive properties were enhanced, making the blue color more vibrant and stable due to polyethylene glycol (PEG). The XPS spectra demonstrated a proton transfer procedure during the photochromic process, and the presence of Mo +5 species indicated a photoreduction interaction between the PMoA particles and the EC-PVP matrix. To the best of our knowledge, this is the first EC-PVP combined hybrid film with POMs with promising prospects for solar UV detection and smart glass windows applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
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IF 2.7
Yi-Kun Wang,Ya-Jun Chen,Yao Pan,Yu Hai-Yin
Traditional biosensors have drawbacks such as temperature sensitivity and cross-reactivity. An innovative UA biosensor was developed. It combined Prussian Blue, carbon nanotubes, PVP with uricase oxidase in a polysulfone hollow fiber gradient membrane, forming a multilayer 3D structure. The optimal pH and temperature for the biosensor were determined to be 8.0 and 37°C, respectively. Electrochemical impedance spectroscopy (EIS) showed that the nanoparticles significantly reduced the working electrode's impedance, enhancing electron transfer. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study the electrochemical behavior of UA oxidation. A distinct oxidation peak for UA was observed at 0.7 V. The sensor exhibited a sensitivity of 0.33 × 10 −6 A/mM, a linear working range from 1.2 to 12 mM, and a detection limit of 0.424 mM. The porous structure of the membrane and the nanoparticles' synergistic effect contributed to high sensor stability. After continuous use for a week, the sensor maintained approximately 90% of its initial performance. This research demonstrates the effectiveness of our method in developing highly sensitive and stable biosensors for UA detection, providing a promising solution for accurate and reliable uric acid level monitoring.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Lina Chen,Xuelong Chen,Baozheng Cui,Jingbo Zhu,Ningjing Bai,Wei Wang,Huixin Wang,Zewen Li,Haijun Niu,Zhe Wang
In recent years, solar energy interfacial evaporation technology has been extensively explored for seawater desalination and wastewater treatment. However, salt accumulation and complex fabrication of evaporator largely constrains the applications of this technology in practice. Here, one type of interpenetrating polymer network hydrogel composing of agarose (AG) and polyvinylpyrrolidone (PVP) using polypyrrole (PPy) as the light absorbent was fabricated via “hot-ice” template method, which was featured with pitted-surface and microchannels structure. The evenly arranged pits on the surface of the hydrogel can absorb the sunlight as much as possible and convert it into heat energy, improving the efficiency of photothermal absorption. The water channels generated by the formation of CaCl 2 ·6H 2 O crystals can transport water from the bottom to the evaporation interface elevating the transmission rate and accelerating the exchange of gradient salt concentration. As consequences, excellent salt resistance of the hydrogel can be obtained, achieving seawater evaporation rate as high as 3.2 kg m −2 h −1 . In addition, the outstanding ion rejection performance, strong acid/alkali purification capability, and good treatment capacity for heavy metal ions and dye wastewater were also demonstrated.
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