CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Hui Liu,Jianying Huang,Zhong Chen,Guoqiang Chen,Ke-Qin Zhang,Salem S. Al-Deyab,Yuekun Lai
In this work, a translucent superhydrophobic coating was fabricated by a simple spray-coating technique using fluorine-free and easily available materials, viz , the hybrids of PDMS and PMMA in THF solution, without any pre-/post-treatment. The combination of the microscale roughness of the sprayed-PMMA, along with the low surface energy PDMS, has contributed to the observed superhydrophobicity. The as-prepared PDMS/PMMA@superhydrophobic surface has displayed a water contact angle of 157.5° and sliding angle of 2.8°. Furthermore, the liquids with various surface tension, ranging from water to various organic liquids, displayed nearly spherical shapes on the superhydrophobic substrate. In addition, this coating has also shown significant stability against sand abrasion and water droplet impact, and was able to maintain its superhydrophobicity after being soaked in strong acid and salkali solutions. Moreover, the superhydrophobic coating was found to be translucent with good visibility of the characters through the coated glass substrate. The transformation from a superhydrophobic state to superhydrophilic state can be realized via a hot-press process, and such a facile technique can be easily applied to potential applications in surface patterning. Additionally, the super-antiwetting surface has been demonstrated for applications in highly efficient oil-water emulsion separation, anti-fouling, and self-cleaning.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Feng Ye,Guo Dong Tang,Si Chen,Bo Zhen Wu,Meng Ma,Yan Qin Shi,Xu Wang
L-lysine-based dendritic gelator(G3-C12-G3) was successfully designed and synthesized using a divergent approach and it can self-assemble into nanofibers in MMA followed by gelation. After thermal polymerization of MMA gels, the self-assembly nanofibers modified PMMA nanocomposite can be obtained. SEM studies indicate the embedded supra molecular nanofibres joint each other and form a relative intact gel networkskeleton in PMMA matrix. Impact strength and DMTAmeasurementindicatethe existence of gel network skeleton make PMMA nanocomposite had higher impact strength and storage modulus than pure PMMA. UV-vis spectrophotometer studies indicate PMMA nano-composite retains high light transmittance.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 2
·508-522
·
IF 5.344
Lei Chen,Yufei Tang,Kang Zhao,Xiang Zha,Min Wei,Quanchang Tan,Zixiang Wu
Drugs are loaded into PMMA bone cement to reduce the risk of infection in freshly implanted prostheses or to promote the differentiation and growth of osteoblasts. However, the same method of loading of drugs in the bone cement cannot simultaneously achieve an effective antibacterial response and long-term treatment outcomes for osteoporosis based on a patient's clinical needs. In the present study, gentamicin sulfate (GS)/alendronate (ALN)-dual-loaded gelatin modified PMMA bone cement (GAPBC) was fabricated to provide rapid and continuous antibiotic release and long-term anti-osteoporotic therapy. Specifically, the gelatin microspheres were loaded with the drugs using separate methodologies, namely, ALN was loaded during fabrication of the gelatin microspheres after which GS was absorbed onto the gelatin from solution. The results demonstrate that sequential release of the GS and ALN was achieved, GS release playing a major role over the first 24 hours and ALN release dominant after 3 weeks of immersion in PBS, resulting from the graded distribution within the gelatin microspheres, and the final drug release ratio of GS (73.6%) and ALN (68.5%) from the modified bone cement was significantly higher than from PMMA bone cement. Therefore, GAPBC represents a potential drug carrier for future clinical applications.
研究领域:
生物医学工程
·
药剂学
·
骨科研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 22
·12404-12414
·
IF 3.049
Wen Liu,Zunyuan Xie,Yaping Lu,Meixiang Gao,Weiqiang Zhang,Lingxiang Gao
A series of core–shell-structured poly(methylmethacrylate)@BaTiO3 (PMMA@BT) composite particles were constructed via the self-assembly of BT nanoparticles on the surfaces of PMMA cores through the covalent bonding of siloxane groups at room temperature. The PMMA@BT composite particles were characterized by scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X-ray diffraction, video-based optical contact angle measurement, thermogravimetric analysis, and impedance analysis. The electroresponses of the obtained PMMA@BT composite particles were all stronger than that of pure BT, and the electroresponse depended on the weight percentage of the BT shell. The PMMA@BT particles with the optimal core–shell structure contained 58.14 wt% of BT shell. The surface hydrophilicity of the optimal particles was close to that of pure BT, and the dielectric constant was the greatest among the series of synthesized PMMA@BT particles. Thus, the optimized PMMA@BT particles demonstrated the strongest electroresponsive behavior in gelatin hydrogel elastomer, as demonstrated by polarized microscopy and dynamic mechanical analysis. The excellent electroresponsive property of the optimal PMMA@BT particles is reflected by the large sensitivity of the increase in storage modulus for the gelatin hydrogel elastomer containing the composite particles (21% at E = 0.8 kV mm−1 and a particle loading of 1.0 wt%), far greater than that of pure BT particles (4.7%). Based on the sensitive electroresponsive properties, the PMMA@BT particles have potential applications as electroresponsive materials.
研究领域:
材料科学
·
电响应材料
✓ 已验证
DOI
高影响因子
Molecular Systems Design & Engineering
·
2022
·Vol. 8
·期 2
·240-250
·
IF 4.92
He Zhang,Lucheng Li,Luyi Wang,Jun Chen,Jing Wang,Yang Liu,Huijie Zhang,Qiang Wang
The development of effective laser protectors to protect human eyes and all optical and photoelectric sensors from temporary or permanent damage caused by laser beams is both of great military significance and a focus of social and public security. In this work, a blue glass of In-Pc-In-PMMA is prepared by doping dinuclear indium phthalocyanine (In-Pc-In) into polymethyl methacrylate (PMMA) glass. The photophysical and nonlinear optical limiting behaviors are investigated and compared with In-Pc-In-THF solution (In-Pc-In-THF). The results indicate that the fluorescence lifetimes of In-Pc-In-THF are τ1 = 0.49 ns (A1 = 9.3%) for the monomer and τ2 = 5.51 ns (A2 = 90.7%) for the dimer. However, for the In-Pc-In-PMMA sample, the fluorescence lifetimes are significantly different from those of In-Pc-In-THF, whose fluorescence lifetimes are τ1 = 1.16 ns (A1 = 51.4%) for the monomer and τ2 = 4.47 ns (A2 = 48.6%) for the dimer, indicating that the fluorescence lifetimes of In-Pc-In-PMMA are dominated by monomers and supplemented by dimers. As a result, the In-Pc-In-PMMA glass presents a larger nonlinear absorption coefficient than that of In-Pc-In-THF solution, which provides a new concept for developing high-performance and practical optical-limiting devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4032-4038
·
IF 2.936
Yuting Xia,Jiayun Chen,Zhicai Zhu,Qilong Zhang,Hui Yang,Qianqian Wang
In this article, we provide a feasible method to prepare high-dielectric-constant hydrophobic composite films, which show potential application as the insulator layer in electrowetting devices. SiO2@MgO core–shell nanoparticles were fabricated via a hydrolysis process and embedded into the PMMA matrix. The microstructure of the nanoparticles and the cross-section of the films indicated that a SiO2 coating has successfully been prepared around the MgO particles with a thickness of about 20–30 nm and the nanofillers were homogeneously dispersed in the polymer. Hydrophobic films (contact angle ∼115°) with appropriate glass transition temperature were obtained. The dielectric constant at various frequencies of the functional fillers enhanced with increasing the SiO2@MgO filler content. The results suggested that SiO2@MgO is more effective in increasing the dielectric constant of PMMA when compared with MgO sheets. Typically, the dielectric constant of the PMMA composite filled with 40 wt% SiO2@MgO reaches 19.1 at 40 Hz, in contrast to 9.7 for the composite filled with 40 wt% MgO sheets and 3.8 for pristine PMMA. Also, the composites exhibited low electrical conductivity (≤10−7) even at high frequency. All the improved performances showed potential application in the dielectric layer of electrowetting devices.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Hui Liang,Dandan Chen,Minfang Chen,Wenjiang Li,Rony Snyders
The nano metallic-based material has received the particular attention of scientists in H 2 storage. Herein, an efficient air-stable nano metallic magnesium (Mg)-Polymethyl methacrylate (PMMA) system, in which methyl magnesium chloride (MeMgCl) as organic Mg precursor is in-situ reduced to metallic Mg particles (Mg NPs) by lithium naphthalene (Li-naphthalene) in soluble PMMA/THF system, exhibits an excellent H 2 storage performance and do not require harsh operation condition. In order to form well-distributed Mg NPs (co. 5 nm) in PMMA gel framework, it is an important procedure to mix Mg ion and Li-naphthalene completely, as well the restriction effect of polymer molecular chain . The synthesized mechanism of nanocomposite and the optimal reaction conditions were ascertained by designing a series of experiments. Notably, PMMA can not confined the size of metallic Mg by blending method, and the mixed β/γ-Mg presents nearly no ability to adsorb hydrogen. Here, the air stable Mg NPs is in-situ reduced in PMMA can be reacted with H 2 , and O 2 and H 2 O molecules can not be infiltrated into PMMA. The correlation between the size of Mg NPs, the amount of PMMA and hydrogen storage performance for the PMMA-Mg NPs composite (PMC) is studied. We have found that hydrogen storage capacity of PMC could be enhanced as decreasing the size of Mg NPs by adjusting the amount of PMMA. The Mg NPs in PMMA might release the higher amount of H 2 at below 300 °C with a rapid absorption/desorption kinetics than the reported material in literature. The obtained nanocomposite are able to deliver dense hydrogen in demanding environments.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 19
·195502
·
IF 3.874
Zhenzhen Ma,Jiahui Li,Yating Zhang,Hongliang Zhao,Qingyan Li,Chengqi Ma,Jianquan Yao
With extremely high optical absorption coefficient in infrared regime, lead sulfide (PbS) quantum dots (QDs)-based photodetectors are promising for diverse applications. In recent years, synthesis of materials has made great progress, but the problem of low sensitivity of quantum dots photodetector still unresolved. In this work, the introduction of a tunneling organic layer effectively address this problem. The dark current is decreased by the appropriate thickness of polymethyl methacrylate (PMMA) barrier layer by suppressing the spontaneous migration of ions, and the photogenerated carriers are little effected, thereby the responsivity of the device is improved. As a result, the device exhibits a high responsivity of 3.73 × 105 mA W−1 and a giant specific detectivity of 4.01 × 1013 Jones at a low voltage of −1 V under 1064 nm illumination. In the self-powered mode, the responsivity reaches a value of 157.6 mA W−1, and the detectivity up to 5.9 × 1011 Jones. The performance of the photodetectors is obviously better than most of the reported QDs photodetectors. The design of this device structure provides a new solution to the problem of low sensitivity and high leakage current of quantum dots based infrared photodetectors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Shuping Zhao,Bing Liu
Colloidal particles in a nonpolar media are closely correlated to industrial applications in particular particle-based electrophoretic display techniques. However, the synthesis of the commonly used poly(12-hydroxystearic acid)(PHSA)-based stabilizers for the dispersion polymerization of polymer particles in nonpolar solvent are troublesome. We report a sorbitan trioleate (Span 85)-based macromolecular copolymer stabilizer that can be easily synthesized and used for the preparation of PMMA particles in a nonpolar solvent. This is realized by synthesizing random copolymers of methyl methacrylate (MMA) and polymerizable sorbitan trioleate (M-Span 85), and the latter can be synthesized from the commercial product Span 85. Using this stabilizer, the resulting PMMA particles have narrow size distribution and tunable diameters. With the stabilizers, transferring water-dispersible particles to a nonpolar solvent and further preparing core/shell particles was verified to be a useful route. This provides an effective approach for using water-dispersible functional nanoparticles in nonpolar environments. In addition, the prepared PMMA particles are demonstrated to be a useful model system to study crystallization or glass transitions by quantitative confocal microscopy.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 23
·15723-15729
·
IF 3.9
Dapeng Gu,Hui Xie,Ziyu Liu,Suwen Chen,Zibo Wang,Siyuan Gao
Textured surfaces were prepared by embedding microspheres with different thermal conductivities of brass microspheres (BS), 304 stainless steel microspheres (SS), and polyoxymethylene microspheres (PS) on the surface of polymethyl methacrylate (PMMA). The effects of surface texture and filling modification on the dry tribological properties of BS/PMMA, SS/PMMA, and PS/PMMA composites were studied by ring-on-disc contact. Based on the finite element analysis of friction heat, the wear mechanisms of BS/PMMA, SS/PMMA, and PS/PMMA composites were analyzed. The results show that regular surface texture can be achieved by embedding microspheres on the PMMA surface. The friction coefficient and wear depth of the SS/PMMA composite are both the lowest. The worn surfaces of BS/PMMA, SS/PMMA, and PS/PMMA composites are divided into three micro-wear-regions. The wear mechanisms of different micro-wear-regions are different. Finite element analysis shows that thermal conductivity and thermal expansion coefficient affect the wear mechanisms of BS/PMMA, SS/PMMA, and PS/PMMA composites.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Siqi Fan,Xu Yao,Jingfang Li,Weizuo Li,Guangming Li
In view of the potential application of NIR luminescence in biology, a series of four new 3,5-Heptanedione (β-diketonate) ytterbium complexes, e.g. [Yb(L) 3 (H 2 O) 2 ] ( 1 ), [Yb(L) 3 (2,2′-bpy)] ( 2 ), [Yb(L) 3 (dpq)] ( 3 ) and [Yb(L) 3 (dppz)] ( 4 ) have been designed and isolated. Crystal structures analysis show that all complexes 1 – 4 exhibit the similar mononuclear structure, in which the central Yb 3+ ion is eight-coordinated forming the square-anti-prismatic geometry. NIR luminescence of all complexes 1 – 4 shows strong characteristic emission of Yb 3+ ions. To improve the mechanical and thermal stability, complex 1 was further doped into poly-(methyl methacrylate) (PMMA) for preparing a thin film ( 1 @PMMA). Their thermal stability and NIR luminescence were essentially enhanced in contrast to that for complex 1 . This NIR luminescent thin film may be of potential applications in biological dictation and luminescent probe.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jinxue Cheng,Naijia Zhao,Yuxin Zhang,Yan Huang,Qinglin Huang,Changfa Xiao
Uniform-sized core-shell microspheres have received more and more attentions owing to the therapeutic application such as controlled release and drug targeting. In this work, we proposed a facile method to fabricate core-shell microspheres with uniform size. Polymethyl methacrylate (PMMA)@polylactic acid (PLA) core-shell microspheres with controllable core and shell size were prepared by combining membrane emulsification (ME) technology and solvent evaporation method. Specially, the near-field electrospinning (NFES) poly(tetrafluoroethylene) (PTFE) membranes and biaxially stretched PTFE membranes were utilized in the ME process. Subsequently, a series of PMMA@PLA core-shell microspheres were successfully prepared, where the core size of microspheres depended on the hydrophobic NFES PTFE membrane while the shell size depended on the hydrophilic biaxially stretched PTFE membrane. Meanwhile, the variation of droplet size and distribution with the evaporation temperature, pressure and continuous phase rotating speed were also investigated. When the solvent evaporation temperature was 40 °C, the obtained PMMA@PLA core-shell microspheres showed optimal morphology and size distribution. Moreover, the shell size increased with the increase of operating pressure and the decrease of continuous phase rotating speed. This facile strategy showed great potential for efficiently preparing uniform-sized core-shell microspheres in large scale.
研究领域:
材料科学
·
制药工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）