CERAMICS INTERNATIONAL
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2026
·
IF 6
Jiahui Ma,Jinchi Chen,Jie Cheng,Zhimin Chai,Yating Huang,Shirong Ge
Achieving a simultaneous enhancement of material removal efficiency and surface quality remains a central challenge in chemical mechanical polishing (CMP) of silicon dioxide. Conventional CeO 2 abrasives, despite their high chemical activity, are prone to agglomeration and cause detrimental scratches. To address this, a core-shell structured poly(methyl methacrylate)@CeO 2 (PMMA@CeO 2 ) composite abrasive was rationally designed and synthesized, in which flexible PMMA microspheres serve as the core and epitaxially grown CeO 2 nanocrystals form the active shell. By precisely controlling the Ce precursor concentration from 2 to 20 mmol, the CeO 2 loading can be systematically tuned from approximately 15 wt% to a saturation level of ∼31.5 wt%, demonstrating a well-bounded and highly controllable synthesis. Comprehensive characterizations confirm the uniform core-shell morphology, high crystallinity, and a consistent high relative Ce 3+ whose absolute number increases with the tunable CeO 2 loading. The optimized abrasive achieves a material removal rate of 102 nm/min and an ultra-low surface roughness of 0.112 nm on SiO 2 film, approaching atomic-level smoothness. Density functional theory calculations suggest that the work function difference between CeO 2 (111) and SiO 2 (001) drives directional electron transfer from CeO 2 to SiO 2 . This electron redistribution strengthens the topmost Si-O bond via chemisorption while imposing tensile stress that elongates and weakens the sub-surface Si-O bonds, potentially promoting preferential cleavage under mechanical shear. This atomic-scale insight, combined with the mechanical buffering effect of the PMMA core, establishes a unique synergy in which the CeO 2 shell provides high chemical activity for efficient material removal and the PMMA core suppresses scratching to ensure atomically smooth, low-damage finishing. This work provides a rational design paradigm for core-shell abrasives and a fundamental theoretical basis for next-generation high-performance CMP materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yiping Chen,Zihao Chen,Jie Wei
In this study, we fabricated a kind of tri-band responsive photonic crystals (TRPCs) for real-time information writing and coding. First, core-interlayer-shell nanoparticles (CISNPs) were synthesized via semi-continuous emulsion polymerization, with photobase generators grafted onto the shell of the CISNPs. The photonic crystals were obtained by a rapid method, spraying the CISNPs solution onto the substrate. Fluorescamine (FA) and diacetylene (DA) solutions were further sprayed onto the photonic crystal surface to obtain TRPCs, respectively. The TRPCs can produce color changes under the light of UVC, NIR, and UVA. According to the tri-band responsive behaviors, the TRPCs were used for real-time information writing and coding. By covering different masks, DA and FA solutions were sprayed on the assembled photonic crystal to write information. Then the written information was displayed after being exposed to the UVC, NIR, and UVA light. Furthermore, photonic crystals with different structural colors assembled by CISNPs with different particle sizes were coded according to various structural colors and fluorescence colors. In this paper, two methods of fabricating photo-responsive photonic crystals were combined, that is, modifying the nanoparticle assembled to form photonic crystals and adding photo-responsive substances into the photonic band gap, to increase the response density of the photonic crystals, which can be applied in more complex anti-counterfeiting and coding.
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高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025010
·
IF 1.929
Hong-Wei He,Xin-Yuan Li,Zhao-Jun Zhao,Xu Yan
Polymer template method is a general and facile to fabricate nano-structural matters. Some amphiphilic polymers or co-polymers were used as templates to synthesize nano-silica. In this contribution, polymethacrylate (PMMA) employed was a commercial hydrophobic acrylate polymer and grafted with a strong hydrophilic polyethyleneimine (PEI, a densely amino-groups polymer) via aminolysis reaction, which was monitored and identified by means of FT-IR. The aminolysis reaction was optimized and the suitable reaction time was 12 h at 110 °C. The obtained copolymer, PMMA-co-PEI was applied as a template to prepare nano-silica spheres that was characterized by a scanning electron microscope (SEM). When the dosage was 1 wt% of purified PMMA-co-PEI, the resultant nano-silica had uniform particle size, and average diameter of 311 nm. When the dosage of PMMA-co-PEI was increased to 2 wt% or 4 wt%, the resultant particles became bigger and inclined to aggregate. Nano-silica afforded by this template method will be a promising material in application of catalysis, energy, biology and chromatographic analysis and the copolymer of PMMA-co-PEI will be a template for producing metal oxide nano-spheres.
研究领域:
材料科学
·
化学工程
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Yuqing Liang,Yan Liu,Xuelong Cao,Qi Yan,Qiuning Hu,Jiahe Zhuang,Defu He
Emerging anthropogenic pollutants such as artificial sweeteners and microplastics (MPs) widely co-occur in natural environments, yet their combined toxicity, particularly obesogenic effects, is completely unknown. This study investigated the effects of sucralose (SUC) and UV-aged poly(methyl methacrylate) (PMMA) MPs using an in vivo model of Caenorhabditis elegans. Exposure to SUC and/or MPs (1–100 μg/L) induced significant obesity phenotypes, including increased body width and volume alongside elevated lipid accumulation and lipid droplet levels in a concentration-dependent manner. Critically, coexposure produced stronger obesogenic effects than predicted additive values from single exposures, demonstrating a synergistic interaction. Behavioral analyses revealed that coexposure concurrently increased pharyngeal pumping rates but decreased crawling locomotion, with obesogenic parameters positively correlating with feeding activity and negatively with locomotor capacity. Molecular analysis confirmed the corresponding dysregulation of genes governing feeding behavior (mgl-1), energy sensing (aak-2), and lipid metabolism (daf-16, sbp-1), supporting the hyperphagia-hypolocomotion phenotype. Metabolomics analysis demonstrated exposure-specific disruption of nicotinate/nicotinamide metabolism and glutamate-mediated biosynthesis pathways, which collectively accelerated lipid accumulation. These results suggest that MPs can act not merely as obesogens but also synergistically amplify SUC’s obesogenic toxicity associated with altered locomotion and metabolism. Our findings highlight the necessity to incorporate cocontaminant interaction assessments into microplastic risk frameworks for addressing underestimated environmental health threats.
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PubMed
高影响因子
Journal of Applied Biomaterials & Functional Materials
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2020
·
IF 2
Xue Xia,Rui Shi,Jinhui Huang,Yubao Li,Yi Zuo,Jidong Li
The aim of the current study is to alleviate the adverse effect of the strongly exothermic polymerization of polymethyl methacrylate (PMMA) bone cement in clinical applications. In this study, paraffin/poly(methyl methacrylate–methylene bisacrylamide) (paraffin/P(MMA-MBA)) phase change microcapsules (MPn; n = 1, 2) were developed via the emulsion polymerization method. The reduction of the maximum temperature of polymerization (Tmax) and physicochemical properties were evaluated after doping commercial PMMA cement with MPn in specific proportions (10%, 20%, and 30%). The results reveal that the MPn-doped PMMA exhibited an effective reduction in Tmax, which can help alleviate the adverse effect of the strong exothermic reactions during PMMA setting. After doping with the MPn, the mechanical properties of the PMMA cement decrease and the values are close to that of body cancellous bone. The Tmax of the cement doped with 20 wt% MP1 is 37.6°C, which is close to body temperature. Significantly, the setting and compressive properties of the optimized group can still adhere to clinical requirements. The MPn doping PMMA technique holds much promise in clinical practice.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
Particuology
·
2013
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IF 1.419
Shouji Qiu,Lei Yang,Ya Zhang,Yongshen Xu
Polymethyl methacrylate (PMMA) encapsulated silica nanocomposite particles were prepared by ultrasonically induced in situ polymerization of methyl methacrylate (MMA) on the surface of silica sol. The nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetry (TG), scanning electron microscopy (SEM). The results showed that core–shell structure nanocomposite particles with an average size of 36 nm were obtained, and the thickness of polymer encapsulating layer was about 8 nm. The pretreatment of silica sol with tert-butyl hydroperoxide (TBHP) and the addition of γ-methacryloxypropyl trimethoxysilane (MAPTS) significantly enhanced the encapsulation effect. Modified by the polymer layer, the silica particles could be well dispersed in matrices and utilized to improve the mechanical performance of polyacrylates.
研究领域:
材料科学
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高分子化学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 35
·16675-16683
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IF 3.925
Rongxing Tang,Yanan Xiao,Hao Luo,Xiaolan Qiao,Jiazi Hou
The development of a smart window and its accessories based on the notion of adaptability to provide somatoform and visual comfort plays a critical role in enhancing indoor quality. In particular, multi-functional intelligent-response window systems have inestimable prospects. In this work, a parallel grille window was selected as a collector on which to deposit electrospun PMMA-SPO fibers. Through regulating the PMMA concentration, we attained a hierarchical architecture composed of oriented fibers associated with microspheres by one-step electrospinning. The formation of microspheres was attributed to the surface layer of turbulent flow being separated under the action of a tangential force in the case of low viscosity, while the main jet-flow was stretched to form continuous fibers. With increasing PMMA concentration, the surface turbulence tended to be stable, so the microspheres disappeared and only nanofibers were obtained. Additionally, the achieved transparent PMMA-SPO screen window showed excellent photochromic properties where ΔE reached 15.56 after 100 s of ultraviolet radiation and high air filtration efficiency with a QF of 0.0274 Pa−1. Most importantly, under the simulated condition of moderate rain, the screen window provided excellent waterproof performance with a superior water-transportation capacity of 93.33%. Therefore, we anticipate that this fascinating multifunctional screen window as a temperature indicator, air filter and rainproof barrier would facilitate the implementation of controlling indoor comfort quality and environment cleanup.
研究领域:
材料科学
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环境科学
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建筑技术
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高影响因子
Coatings
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2022
·Vol. 12
·期 12
·1947
·
IF 3.236
Qin Luo,Xuzhao He,Xiyue Duan,Haoqing Liu,Zhiyuan Zhou,Kui Cheng
Bone repair and regeneration have aroused widespread interest due to their potential usefulness in cases when bone self-healing is insufficient. In this work, a Poly(vinylidene fluoride-trifluoroethylene)-coated-Poly methyl methacrylate Janus membrane was prepared, where a P(VDF-TrFE) coating on a PMMA film serves as Janus-A to mediate cell growth behavior, owing to its electroactivity, and the PMMA film serves as Janus-B to inhibit soft-tissue growth. A P(VDF-TrFE) coating separated from the substrate was put above the PMMA film before the PMMA film had dried completely, and a Janus membrane formed because of the flowability and adhesion of the nonvolatile PMMA solution. Their bonding could withstand the pressure of the body fluids in the shear direction. Various crystallization substrates were also applied to modulate the P(VDF-TrFE) coating’s surface potentials, as the surface potential would further affect cellular response. It was also found that the responses of the bone marrow mesenchymal stem cells (BMSCs) and bone marrow macrophages (BMDMs) could be adjusted through surface potential modification. Such a Janus membrane could potentially be applied to a biological environment with the effect of both guiding bone regeneration and preventing soft tissue adhesion.Keywords:Janus membrane;P(VDF-TrFE);PMMA;bone tissue regeneration
研究领域:
生物材料学
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组织工程学
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高影响因子
Materials
·
2017
·Vol. 10
·期 6
·572
·
IF 2.654
Chao Li,Qingde Li,Xiaohui Ni,Guoxiang Liu,Wanli Cheng,Guangping Han
A modified coaxial electrospinning process was used to prepare composite nanofibrous mats from a poly(methyl methacrylate) (PMMA) solution with the addition of different cellulose nanocrystals (CNCs) as the sheath fluid and polyacrylonitrile (PAN) solution as the core fluid. This study investigated the conductivity of the as-spun solutions that increased significantly with increasing CNCs addition, which favors forming uniform fibers. This study discussed the effect of different CNCs addition on the morphology, thermal behavior, and the multilevel structure of the coaxial electrospun PMMA + CNCs/PAN composite nanofibers. A morphology analysis of the nanofibrous mats clearly demonstrated that the CNCs facilitated the production of the composite nanofibers with a core-shell structure. The diameter of the composite nanofibers decreased and the uniformity increased with increasing CNCs concentrations in the shell fluid. The composite nanofibrous mats had the maximum thermal decomposition temperature that was substantially higher than electrospun pure PMMA, PAN, as well as the core-shell PMMA/PAN nanocomposite. The BET (Brunauer, Emmett and Teller) formula results showed that the specific surface area of the CNCs reinforced core-shell composite significantly increased with increasing CNCs content. The specific surface area of the composite with 20% CNCs loading rose to 9.62 m2/g from 3.76 m2/g for the control. A dense porous structure was formed on the surface of the electrospun core-shell fibers.Keywords:cellulose nanocrystals;coaxial electrospinning;core-shell structural nanofibers;thermal properties;fiber morphology
研究领域:
材料科学
·
纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 6
·1-8
·
IF 1.969
Li Hui,Zhang Qiuyu
In this paper, P n BA- g -PMMA brush-like and centipede multigraft copolymers were synthesized via DPE seeded emulsion polymerization and miniemulsion polymerization. PMMA macromonomers with single tail and double tails were prepared by DPE-technique in emulsion and Steglich esterification. Then P n BA- g -PMMA multigraft copolymers were obtained by miniemulsion copolymerization. The molecular weight and polydispersity indices of PMMA macromonomers and graft copolymers were characterized by GPC. The structural characteristics, weight content of PMMA and the number of grafting sites in brush-like and centipede multigraft copolymers were determined by 1 H NMR. The thermal performance of graft copolymers were analyzed by DSC and TGA. AFM confirmed microphase separation between P n BA block and PMMA block.
研究领域:
材料科学
·
高分子化学
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高影响因子
POLYMER COMPOSITES
·
2024
·Vol. 45
·期 9
·8543-8554
·
IF 4.8
Songbo Tan,Guohui Wang,Jun Liu,Xiaoli Chen,Zui Tao,Jinlu Chen,Xuan Yang,Guowen Peng
Development of shielding materials for 222 Rn and γ radiation has crucial implications for ensuring the safety of individuals. This paper reports the synthesis of modified graphene nanosheets (MGNPs) via the reaction of KH560 with graphene nanosheets (GNPs), while melt blending and hot-press molding technique were used to fabricate a multifunctional polymer composite shielding material, MGNP/WB/PMMA (polymethyl methacrylate). Successful synthesis of MGNP was confirmed by Fourier transform infrared spectroscopy, and scanning electron microscope (SEM) analysis was utilized to assess the distribution of functional fillers within the cross-section of the polymer composite. Additionally, thermogravimetric analysis (TGA) demonstrated that MGNP and WB particles enhance the thermal stability of the polymer composite materials. Compared to pure PMMA, 98.7% decrease in the radon diffusion coefficient was observed for MGNP1.5 wt%/PMMA composite material. In addition to enhance the radon-blocking characteristics of the polymer composites, inclusion of WB particles also boosts their shielding capacity against gamma radiation. The 222 Rn diffusion coefficient of MGNP1.5 wt%/WB25wt%/PMMA polymer composite material decreased by 99.6% and at energies of 60 KeV, 80 KeV, 122 KeV, 365 KeV, the mass attenuation coefficient (MAC) for the composite material increased by 0.79, 1.97, 0.57, and 0.05 cm 2 /g, respectively, compared to pure PMMA. Highlights The PMMA composite materials doped with graphene nanosheets demonstrate outstanding resistance to 222 Rn. Graphene nanosheets modified by KH560 exhibit favorable dispersion within PMMA. WB can further enhance the radon resistance of MGNP/WB/PMMA composite materials. The polymer composites exhibit excellent 222 Rn and gamma ray shielding properties.
研究领域:
材料科学
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辐射防护
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Yu Wang,Wenxiong Chen,Meng Pan,Weijie Liang,Jiahao Lu,Rui Feng,Yang Zhang
Polypropylene (PP) is extensively implemented in electronic equipment and power systems owing to its superior performance, such as high breakdown strength ( E b ), low dielectric loss (tan δ ), and outstanding self-healing capability. However, its low dielectric constant ( ε r ) and restricted energy density ( U e ) obstruct the miniaturization and integration of dielectric capacitors. To address these limitations, PP/PMMA/PP-g-MAH dielectric blend films were prepared via the melt blending and hot-pressing process. The transesterification reaction between the pendant anhydride groups of PP-g-MAH and the ester groups of PMMA forms ester bonds, which reduces the interfacial free energy and, in turn, significantly improves the compatibility between PP and PMMA. The blend film containing 4 wt% PP-g-MAH exhibits a high U e of 7.53 J/cm 3 at 502 MV/m, with an excellent charge–discharge efficiency ( η ) of 97.8%. This work presents a feasible strategy for developing all-organic polypropylene-based dielectric film with superior energy storage performance.
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高影响因子
危险品化学品经营许可证（带存储）