APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jian Wang,Yunchuan Xie,Jingjing Liu,Zhicheng Zhang,Yanfeng Zhang
Poly(vinylidene fluoride) (PVDF) based polymer/ceramic nanocomposites for high energy density dielectrics have long been plagued by their low discharging efficiency (40–60%), which originates from the matrix with high bulk ferroelectric relaxation and the high-k ceramics with large conduction loss. In this work, a linear-like PVDF-based polymer dielectric is synthesized through grafting poly(methyl methacrylate) (PMMA) onto main chains of poly(vinyl fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) terpolymer via an atom transfer radical polymerization (ATRP) process. PMMA grafted terpolymer (P(VDF-TrFE-CTFE)-g-PMMA) shows linear-like dielectric characteristics accompanied with greatly enhanced discharging efficiency of ∼80% under 250 MV/m, which is over 100% higher than that of pristine terpolymer. To further improve its breakdown strength and discharging efficiency, the grafted terpolymer are then compounded with ultrasonic-exfoliated mica nanosheets ( e Mica) by solution-cast method. Thanks to the low hysteresis loss of linear-like dielectric matrix and the high insulating 2D mica nanosheets, the composite with the highest discharging efficiency of ∼78% under 250 MV/m is achieved. The maximum energy density of the optimized composite reaches 9.6 J/cm 3 , which is nearly 290% that of the pristine terpolymer. Besides, its discharging efficiency is about 74% under 450 MV/m, which is much more advantageous than the other PVDF-based polymer/ceramics composite dielectrics. This work suggests that utilizing polymer matrix with linear dielectric property and fillers with high insulating 2D structure might be a facile strategy to achieve composite dielectrics with simultaneously high energy density and high discharging efficiency.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yujiu Zhou,Qingxia Liu,Fujia Chen,Xiali Li,Song Sun,Jimin Guo,Yuetao Zhao,Yajie Yang,Jianhua Xu
High energy storage density with low-energy loss polymer films are essential for high-performance electric devices. To avoid the high-energy loss of utilizing nonlinear polymer materials, a sandwich nanostructure comprising a linear polymer poly(methyl methacrylate) (PMMA) matrix embedded with a high dielectric constant BaTiO 3 (BT) interlayer and poly(vinylidene fluoride) (PVDF) binder was constructed using a solution casting strategy. This structural design takes advantage of each component in the composite. The good dispersion of BT particles in the binder, which was incorporated between PMMA, enabled a high dielectric constant and fewer defects. Additionally, the excellent film formation ability of the PVDF binder guarantees the uniform thickness and stable structure of the BT mid-layer, and good miscibility between PVDF and PMMA enhanced the interaction between each layer. Interestingly, since the dielectric constant of PVDF was between BT fillers and PMMA, a dielectric gradient distribution mitigated the local electric field concentration, as proven by the simulation results. Consequently, a low-loss linear PMMA composite film exhibited satisfying breakdown strength and excellent discharged energy density , which were 25% and 460% higher than those of pristine PMMA, respectively.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
复合材料
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 22
·225602
·
IF 3.551
Changsong Chen,Dan Li,Yihua Wu,Cheng Chen,Zhi-Gang Zhu,Wan Y Shih,Wei-Heng Shih
Perovskite nanocrystals are a new type of fluorescent material with the advantages of facile preparation process, bright tunable color with high quantum yield. They are ideal candidates for optoelectronic devices such as light-emitting diode (LED) and display. However, for practical applications of iodine-based perovskite nanocrystals, the photostability remains a great challenge because of their sensitivity to environmental factors such as oxygen, humidity etc. In this paper, we improve the photostability of CsPbI3 by introducing the polymethyl methacrylate (PMMA) as a matrix to form flexible perovskite/PMMA composite films. The composite films maintain good photoluminescence quantum yield for 25 d in air and 4 d in water. Furthermore, these films are flexible and can sustain multiple bending and folding while maintaining their photoluminescence properties. This photostability against mechanical deformation allows for the development of flexible devices. As an example, flexible white light-emitting diodes (WLED) were produced with chromaticity coordination (0.31, 0.32), color temperature 6735 K and good stability over time.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Zhonglong Wang,Aibi Yang,Xinyu Tan,Yiteng Tu,Sydney Sabin,Peng Xiang,Man Wang,Runhua Guo,Xiaobo Chen
Superhydrophobic (SHP) coatings have been reported with many promising applications using various nano-micro structures with surfactants of low surface energies. However, many SHP coatings have poor durability, largely limiting their practical importance. In this study, a durable SHP coating is demonstrated with a novel veil-over-sprout micro-nano structure of silica nano particles (SNP) and poly(methyl methacrylate) (PMMA). This coating displays a large water contact angle (WCA) of 168.0° and a small sliding angle (SA) of less than 1.0°. Excellent abrasion resistance is demonstrated with excellent superhydrophobicity (WCA = 159.0°) after consecutive tests with sandpaper, high-density water flow and fine sand impact. An excellent self-healing function has been achieved with this SHP coating after stored at room temperature , recovering its remarkable superhydrophobicity. Outstanding resistance against ice formation is exhibited with the starting-freezing time at −20 ℃ three times longer than uncoated surface. Strong resistance to acid and base attacks is observed even after a week of immersion in highly acidic and alkaline environments (pH 1.0–14.0), without much degradation of SHP performance. Efficiency of up to 99.9% is demonstrated in corrosion protection in a solution with pH = 10.0 to extend the life of the metal. In addition, remarkable SHP durability is demonstrated after long-term outdoor exposure. Therefore, this work has shown off a promising methods for SHP coatings towards future practical applications.
研究领域:
材料科学
·
表面工程
·
纳米技术
·
涂层与薄膜
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Xiuting Li,Hongmei Liu,Ying Chen,Chenjie Gu,Guodong Wei,Jun Zhou,Tao Jiang
Pesticides and additives, extensively used in the raw agriculture samples and processed food, have attracted tremendous interests owing to their latent menace to the surroundings and human health. Herein, a rationally designed multifunctional polymethyl methacrylate-silver/graphite-like carbon nitride/silver (PMMA–Ag/g-C3N4/Ag) hybrid substrate with plasmonic-enhanced intrinsic Raman signals was exploited and served as a recyclable and quantitative surface-enhanced Raman scattering (SERS) sensor. Especially, the as-prepared flexible substrate with an electromagnetic enhancement factor of 1.64 × 106 could realize the sensitive monitoring and in-situ degradation of thiabendazole (TBZ) and carmine acid (CA) on apple or in applesauce with limits of detection as low as 2.29 × 10–6 and 6.76 × 10–5 mg/mL. Furthermore, heightened linear correlations with coefficients of 0.996 and 0.997 were accurately acquired using the film peak of PMMA as an internal standard. It was proved that the proposed sophisticated substrate may present attractive superior-in-practice multiplexed quantitative monitoring and facile decomposing of harmful molecules. The resulting recovery values distributed from 60.9 to 126% for the deeply processed foods that were decorated by 10–4 to 1 mg/mL CA together with TBZ.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 41
·33966-33975
·
IF 4.6
Yin-Yu Qi,Lu-Yang Han,Long-Xu Han,Wen-Han Bu,Yang Xu,Jian-Jun Chu
A sortase A inhibitor (SrtA I)-loaded bone cement (SLBC) containing 1-(3,4-dichlorophenyl)-3-(dimethylamino)propyl-1-one hydrochloride (AEEK1) was reported. Compared with gentamicin-loaded bone cement (GS cement), which is a widely used antibiotic-loaded bone cement in cemented total joint replacement (TJR), SLBC demonstrated a significantly prolonged effective antibacterial duration against both Staphylococcus aureus (S. aureus) and methicillin-resistant S. aureus (MRSA). The quasi-static compressive strength, maximum polymerization temperature, and setting time of SLBC were within the limits stated in the ISO 5833 standard and comparable to the corresponding values of GS cement. In vitro and in vivo experimental results confirmed the biocompatibility of SLBC and showed its easy injectability into porcine T12 vertebrae. Taken together, these findings suggest that SLBC may have potential for managing/treating prosthetic joint infections, which is a common complication in cemented TJR.
研究领域:
生物材料
·
骨科手术
·
感染性疾病
·
药物制剂
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Hai Jiang,Yingli Ding,Juyang Liu,Arun Alagarsamy,Li Pan,Dongpo Song,Kunyu Zhang,Yuesheng Li
A series of poly(L-lactic acid) (PLLA)-b-poly(methyl methacrylate) (PMMA) block copolymers with well-defined chemical structures were synthesized by ring-opening polymerization followed by atom-transfer radical polymerization. These copolymers were investigated as effective A-b-C-type compatibilizers for poly(lactic acid) (PLA) and renewable poly(epichlorohydrin-co-ethylene oxide) (ECO) elastomer blends. Compared to the neat binary PLA/ECO blend, the PLLA-b-PMMA copolymers significantly improved the compatibility of the PLA and ECO phases, leading to enhanced interfacial adhesion and mechanical performance. Interestingly, by tuning the chain structure and adding different amounts of the copolymer, two different phase structures were achieved in the blends: a typical sea-island morphology of the blends with a low content of PLLA-b-PMMA block copolymers (<15%) and a unique tricontinuous phase morphology with a percolated PLLA-b-PMMA copolymer zone of the blend with the addition of 20 wt % asymmetric A181M868 block copolymer. Both the morphological structures endowed the blends with excellent toughness, including a high elongation at break (>260%) and non-broken behavior with an optimum impact strength above 63 kJ/m2. Accordingly, two different toughening mechanisms were proposed for the blends with different phase structures. The PLLA-b-PMMA block copolymers provide highly efficient and versatile A-b-C-type compatibilizers to fabricate high-performance sustainable PLA-based materials for wide application prospects.
研究领域:
材料科学
·
高分子科学
·
可持续材料
·
复合材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Ziyue Wang,Huan Liu,Yicheng Peng,Jiyang Xie,Chengding Gu,Wanbiao Hu
Enhancing the breakdown strength (Eb) and polarization of the polymer-based composites through improving the effective interface bonding between the inorganic fillers and polymer matrix is always pursued to achieve high electrostatic energy storage performances. Along with this, paraelectric–ferroelectric (P–F) structured bipolymer PMMA-P(VDF-HFP) was copolymerized and blended to maintain the high Eb but reduce the residual polarization, and meanwhile, potassium triniobate (KNb3O8) rods synthesized by a molten salt (KCl and K2SO4) method were surface-modified using a polydopamine (PDA) shell to form fillers for the fabrication of the composite films that were prepared by a solution casting process. The fabricated PDA@KNb3O8/PMMA-P(VDF-HFP) composite film by filling only a tiny amount of PDA@KNb3O8 (1.0 wt %) exhibits a much enhanced dielectric constant (ε ∼ 9) and polarization (Pmax ∼ 6.9) and large Eb (∼600 MV m–1), therefore giving rise to a high energy density of 15.30 J cm–3 combined with a discharge energy efficiency of 65%. The results herein can be comparative and superior to those of many high-energy storage inorganic–polymer systems that may render this system much potential for dielectric energy storage capacitors.
研究领域:
材料科学
·
电气工程
·
复合材料
·
能量存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhaoming Wang,Zixian Wei,Yuting Cai,Lei Wang,Mutong Li,Ping Liu,Rongjun Xie,Lai Wang,Guodan Wei,H. Y. Fu
Cesium lead halide perovskite nanocrystals have recently become emerging materials for color conversion in visible light communication (VLC) and solid-state lighting (SSL), due to their fast response and desirable optical properties. Herein, perovskite nanocrystal-polymethyl methacrylate (PNC-PMMA) films with red and yellow emission are prepared. The PNC-PMMA films, with optical properties such as a short lifetime and air stability, are used to make broadband color converters based on a high-bandwidth 75 μm blue micro-LED (μLED) for VLC. The yellow-emitting CsPb(Br/I)3 PNC-PMMA has a high bandwidth of 347 MHz, while the red-emitting CsPbI3 PNC-PMMA exhibits a higher modulation bandwidth of 822 MHz, which is ∼65 times larger than that of conventional phosphors. After fixing the two PNC-PMMA films in front of the μLED, a qualified warm white light is generated with a correlated color temperature of 5670 K, a color rendering index of 75.7, and a de L’Eclairage (CIE) coordinate at (0.33, 0.35). Although the color conversion of the blue light sacrifices some received power and slightly reduces the overall bandwidth from 1.130 to 1.005 GHz, a maximum real-time data rate of 1.7 Gbps is still achievable using the non-return-to-zero on–off keying modulation scheme, which is ∼6 times higher than that of the previous record. This study provides a practical approach to develop a considerably high-bandwidth white-light system for both high-speed VLC and high-quality SSL.
研究领域:
材料科学
·
光电
·
通信工程
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 32
·25885
·
IF 4.6
Qiuping Li,Hongxia Ouyang,Xinghui Yang,Qi Wang,Yonghong Ding,Haichao Yu,Zhi Rao
Lanthanide organic–inorganic hybrid fluorescent materials are considered as promising candidates for next-generation lighting materials due to their unique optical properties and potential applications. In this work, commercialized silica materials (fumed silica) were selected as the carrier. By means of the bridging function of silane coupling agents, Eu(TTA) 3 (Phen) was covalently grafted onto the surface of fumed silica to synthesize lanthanide hybrid phosphors. Subsequently, the phosphor was dispersed into the MMA polymerization system, and a monolithic fluorescent organic glass was fabricated via in situ polymerization. Both the obtained europium hybrid phosphor and the europium complex-doped organic glass exhibited intense red fluorescence under UV light and possessed the characteristics of broad absorption, narrow emission, and long fluorescence lifetime. The design and synthesis process is straightforward and cost-effective, making this approach highly valuable for the development and advancement of novel rare earth hybrid luminescent materials. A novel Europium organic–inorganic hybrid fluorescent materials with excellent luminescent properties were successfully synthesized using commercialized silica materials as the carrier and PMMA as the matrix.
研究领域:
材料科学
·
无机化学
·
物理化学
·
高分子科学
·
光学材料
·
纳米技术
·
杂化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 105
·103843-103850
·
IF 3.289
Aitang Zhang,Aihua Li,Yao Wang,Mengli Liu,Hongjing Ma,Zhongqian Song,Jingquan Liu
Mesoporous carbon nanoparticles (MCNs) were prepared through a series of annealing procedures using well-controlled diblock copolymer micelles as precursors. The micelles were prepared from poly(acrylonitrile)-block-poly(methylmethacrylate) (PAN-b-PMMA), and synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization. The RAFT-controlled synthesis of block copolymer, PAN-b-PMMA was conducted either in solution or emulsion conditions. It was found that micelles with well-defined morphology could be directly formed from the emulsion polymerization. The as-synthesized micelles containing hydrophilic PAN corona as the carbon source and hydrophobic PMMA core as the sacrificing template underwent a microphase-separation process to form a nanostructure at 250 °C, followed by carbonization at 800 °C to afford MCNs. What's more, the MCNs based supercapacitor exhibited a good capacitance value of 220 F g−1 and an excellent cycling performance of 91% capacitance retention after 10 000 cycles. The as-prepared MCNs are envisioned to provide broad practical applications in the fields of energy storage and nanotechnology.
研究领域:
材料科学
·
纳米科技
·
能源存储
·
高分子化学
·
电化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2024
·
IF 4.4
Siyuan Yu,Xian Shao,Tong Wu,Zheng Liu,Pei Yu,Jinfeng Xing
In order to achieve long-term and controllable release of anti-tumor drugs at specific sites, temperature/pH responsive nanoparticles encapsulating 5-fluorouracil and methotrexate in situ are prepared through dispersion photopolymerization under green LED irradiation. The physicochemical properties of nanoparticles are characterized by scanning electron microscopy, Fourier transform infrared, dynamic light scattering, thermogravimetric/differential scanning calorimetry, and X-ray diffraction. In vitro drug release at different temperatures and pH values is examined to ascertain the release pattern of two drugs, which can be well described by Korsmeyer–Peppas kinetic model. The cytotoxicity evaluation illustrates that the tumor cells could be more effectively killed by the drug-loaded nanoparticles, and the improved therapeutic effect is attributed to the controllable and sustainable drug release as well as the enhanced cellular uptake. The blood safety and good biocompatibility of nanoparticles are further confirmed by hemolysis assay, indicating the prepared nanoparticles are potential candidates for effective tumor treatment.
研究领域:
纳米技术
·
药学
·
材料科学
·
生物医学工程
·
癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）