ENERGY & FUELS
·
2020
·
IF 3.421
Han Jia,Jiajun Dai,Pan Huang,Yugui Han,Qiuxia Wang,Juan He,Jinyong Song,Xin Wei,Hui Yan,Dexin Liu
It is greatly desired to develop a high-efficiency demulsifier for the treatment of O/W emulsions in the production fluids of the petroleum industry. In this study, the amphiphilic Janus-SiO2 nanoparticles (Janus-C18) was synthesized and used as a demulsifier for surfactant-stabilized O/W emulsions. The successful preparation of Janus-C18 was verified by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and contact angle measurements. Then, Janus-C18’s demulsification efficiency was systematically evaluated by the bottle test. Various silica nanoparticles and emulsifier were employed in the control experiments. Based on the Janus-C18’s demulsification performance in different conditions and the ζ-potential measurement, the possible demulsification mechanism of Janus-C18 was proposed. Furthermore, Janus-C18 exhibited excellent performance in separating oil from crude oil/water emulsions at a relatively low concentration (150 mg/L), with the oil removal rate exceeding 99%.
研究领域:
化学工程
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材料科学
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石油工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE JOURNAL OF QUANTUM ELECTRONICS
·
2020
·Vol. 56
·期 3
·1-9
·
IF 2.384
Zong-Tao Li,Jie-Xin Li,Jia-Sheng Li,Zi-Hao Deng,Yue-Hua Deng,Yong Tang
The scattering effect plays an important role in improving the optical performance of the quantum dot (QD) white light-emitting diodes (LEDs). A majority of the previous studies have focused on the planar packaging structure only with respect to total internal reflection (TIR). In this study, SiO2 nanoparticles are incorporated into QD-silicone encapsulation of LEDs with semi-spherical lens packaging (SSLP) to exploit their scattering effect. The results show that the radiant efficacy (31.35%@100 mA) and luminous efficacy (87.56 lm/W@100 mA) of QD white LEDs can be optimized using SiO2 nanoparticle concentration (0.1 wt%) and that they increase by 5.04% and 11.08%, respectively, as compared to the conventional structure. A comprehensive ray-tracing simulation validates that the nanoparticles in the SSLP structure lead to severe loss of chip light. On the contrary, the fluorescence light increases due to the enhancement of conversion by QDs. The transmission electron microscopy images and the finite-difference time-domain simulation have been introduced to investigate the surface adsorption of SiO2 nanoparticle. This study indicates that SiO2 incorporation is an effective method to improve the efficiency of QD white LEDs, and provides a better understanding on the scattering effect based on TIR, color conversion, and surface adsorption.
研究领域:
光学
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材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Yuhuan Yuan,Cong Peng,Duo Chen,Zhanjun Wu,Shichao Li,Tao Sun,Xin liu
SiO 2 nanoparticles (NPs) were modified with as-synthesized coupling agent containing isocyanate-terminated polyurethane (PUCA) to enhance the interaction between SiO 2 NPs and DGEBA/DDM matrix in purpose of promoting the dispersion condition of the SiO 2 NPs in cured resin. Uniform dispersion of the PUCA-SiO 2 NPs was observed in the cured resin which was in obvious contrast with that of the raw SiO 2 NPs and the IPTS-SiO 2 NPs according to the visible light transmittance and TEM observation. The tensile behaviors of the PUCA-SiO 2 composites were found obviously promoted than that of the raw SiO 2 and IPTS-SiO 2 composites. DMA results showed that the T g of the PUCA-SiO 2 composite was 8.9 °C and 5.8 °C higher than that of the raw, IPTS-SiO 2 composite. SEM observation of the fracture surfaces showed that PUCA-SiO 2 composite possessed the densest crack texture. This work showed that grafting the polyurethane chain to the surface of the inorganic NPs is an effective way to obtain uniform dispersion of the inorganic NPs in resin matrix.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Siyuan Jin,Jie Zhou,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Neshchimenko Vitalii,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
A multi-structured composite coating with superhydrophobic properties, corrosion resistance, and wear resistance was prepared on the surface of Mg-9Li-3Al alloy. A porous layer was formed on the substrate surface via micro-arc oxidation. Then, LDH was grown in situ on the MAO coating surface through hydrothermal treatment, sealing the pores in the coating. Finally, HDTMS-SiO₂ was assembled on the LDH surface. The SiO₂ formed an island-like micro-nano structure, trapping air and creating an “air cushion” on the coating surface，imparting superhydrophobicity (contact angle and sliding angle of 162.1 ± 2.1° and 4.2 ± 0.2°). And the corrosion resistance of the MLS coating is significantly improved the corrosion current density decreased by three orders of magnitude. The incorporation of HDTMS-SiO₂ not only improved the corrosion resistance of the coating but also significantly enhanced its wear resistance. During friction, the SiO₂ nanoparticles acted as “ball bearings,” shifting the friction mode from sliding to rolling. The fragmented SiO₂ further served as a solid lubricant, reducing the coefficient of friction to 0.11.
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
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Hongkun Li,Qianqian Cai,Yangyang Guan,Zhikang Li,Guifen Jie,Hong Zhou
A multimode sensing and imaging platform based on surface modification strategy of Ru(bpy) 3 2+ doped SiO 2 nanoparticles (RuSiO 2 NPs) was constructed for versatile detection of glutathione (GSH). RuSiO 2 NPs as the luminophore models had outstanding fluorescence (FL) and electrochemiluminescence (ECL) signals. Furthermore, its FL signal could be captured by electrophoresis analyzer, and the ECL signal could be imaged with mobile phone to achieve visualization. So, a unique and convenient multi-mode sensing and imaging platform could be developed based on RuSiO 2 NPs. SiO 2 NPs could realize enrichment of Ru(bpy) 3 2+ based on the nanoconfined effect to achieve signal amplification, and its surface was rich with abundant hydroxyl functional groups, which offered a channel for surface modification. Sulfhydryl modification on the RuSiO 2 NPs was realized by using silane coupling agent, and KMnO 4 was used to in situ generate MnO 2 shell on the surface of RuSiO 2 NPs for quenching its ECL, FL, and colorimetric (CL) signals based on resonance energy transfer (RET). Target GSH could reduce MnO 2 shell to realize recovery of all signals, thus achieving the label-free multimode detection of GSH. Therefore, this work developed a multimode sensing and imaging platform without signal labels or layer-by-layer assembly of electrodes, which had the advantages of simple steps, low cost, and high detection accuracy, showing important application potential in the field of bioanalysis.
研究领域:
生物分析
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化学传感
✓ 已验证
产品关联
DOI
高影响因子
AATCC Journal of Research
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2024
·
IF 0.6
Que Kong,Zhiguang Li
In this paper, modified SiO2 nanoparticles were selected to improve the surface roughness and decrease the surface energy to improve the hydrophobic performance of cotton fabric. Tetraethoxysilane and octadecyltriethoxysilane were used as raw materials to synthesize octadecyltriethoxysilane-modified SiO2 nanoparticles (siloxane-SiO2), and combined with cotton fabric. The chemical composition and surface morphology of the fabric were measured. The contact angles of the modified cotton fabrics prepared under different reaction conditions were approaching or above 150°. In addition, dynamic evolutions of water droplets on the modified cotton fabric surface were discussed. The adhesive force and the energy conversion of droplet during the collision were investigated. The water droplet bounced due to the superhydrophobic properties of the cotton fabric surface producing enough residual energy. Finally, through the acid–base chemical resistance treatments, the rubbing and washing durability, and anti-fouling experiment, the modified fabric indicated excellent hydrophobic durability and self-cleaning performance.
研究领域:
材料科学
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纺织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2024
·
IF 1
Liyuan Zhang,Xuewen Bai,Kai Zou,Linlin Zhu
Magnetic polymer microspheres have attracted a great deal of attention due to their magnetic properties and good biocompatibility. In this study, novel magnetic cross-linked poly(divinylbenzene-co-acrylic acid) microspheres were successfully prepared via improved emulsion polymerization. The microstructures of nanocomposites were characterized using scanning electron microscopy, transmission electron microscope, energy-dispersive X-ray spectrometry, X-ray diffraction, and saturation magnetization measurements. It was noteworthy that the nanocomposites displayed good water dispersibility, a rapid absorption rate, a high absorption capacity, and high magnetic separability, results that are promising in terms of these nanocomposites’ future application in biomedical fields.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Xin Tian,Zhengping Dong,Rou Wang,Jiantai Ma
A highly selective and sensitive method for recognition of Zn 2+ and hydrogen sulfide (H 2 S) in aqueous solution has been developed by using a quinoline fluorescent sensor functionalized magnetic silica nanoparticles ( R1 ). The chemosensor R1 shows excellent fluorescence sensitivity and selectivity toward Zn 2+ and H 2 S in aqueous media , and displays off–on–off type fluorescence change with alternately adding Zn 2+ and H 2 S to the media along with reversible association–dissociation of the complex. Furthermore, the magnetic nanocomposites can be easily separated from solutions by adding an external magnetic field . Finally, using Zn 2+ and H 2 S as inputs and the fluorescence intensity as output, an INHIBIT logic gate can be constructed at the nanoscale level.
研究领域:
分析化学
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纳米技术
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 7
·1700117
·
IF 4.474
Yanning Qu,Renliang Huang,Wei Qi,Qi Qu,Rongxin Su,Zhimin He
Encapsulation of enzymes with enhanced activity and recyclability in water-in-oil Pickering emulsions is a simple and efficient method for their immobilization; however, the effect produced by the structure of colloidal particles on the stabilization of the Pickering emulsion for enzyme catalysis has not been investigated in detail. In this study, four types of hydrophobic Fe 3 O 4 @SiO 2 nanoparticles (NPs) with similar chemical compositions, particle diameters, but different surface characteristics have been prepared and utilized for enzyme encapsulation in various water-in-oil magnetic Pickering emulsions, after which the relationship between NPs structure, size of emulsions droplets, and enzyme activity is examined. The obtained results indicate that (i) the more hydrophobic Fe 3 O 4 @SiO 2 NPs cause the higher enzyme activity; (ii) the higher hydrophobicity of oil phase also increases the enzyme activity, especially for Fe 3 O 4 @w-SiO 2 NPs which form in the solvent of water. The results are mainly attributed to the higher specific surface area of emulsion droplets and interfacial mass transfer of substrates through the interfaces of droplets. The reported data provide new insights into the mechanism of stabilization of Pickering emulsions for enhancing enzyme activity and demonstrate efficient theoretical references for enzyme immobilization and synthesis of stable and active biocatalysts with high recyclability.
研究领域:
生物化学
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材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2014
·
IF 1.332
Yun Zhang,Guangqing Zhuang,Yanrong Jia,Qinguo Fan,Jianzhong Shao
(SiO2/PEI)n films with structural colors on polyester fabrics were fabricated using negatively charged SiO2 nanoparticles and positively charged polyethyleneimine (PEI) using the electrostatic self-assembly approach. The bright and variable structural colors of polyester fabrics coated with a (SiO2/PEI)n film were investigated through the color photos captured by a digital camera, and also through the reflectance spectra and the images measured by a DigiEye system and a multi-angle spectrophotometer. The morphological structure of (SiO2/PEI)n films was characterized by scanning electron microscopy (SEM), and the electrostatic self-assembly process and the driving forces of fabricating the (SiO2/PEI)n films were investigated and schematically illustrated. The results showed that the structural colors varied with the various assembly cycles and viewing angles; both the optical properties indicated by the structural colors and the morphological structures illustrated by the SEM images confirmed that the (SiO2/PEI)n film on a polyester fabric was a homogeneous porous composite monolayer, with structural colors originated from single thin film interference; the self-assembly process of (SiO2/PEI)n film on a polyester fabric was driven by multi-forces, with dominant forces equilibrium of electrostatic attraction and repulsion.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Peng Tan,Yan-Hua Li,Xiao-Qin Liu,Yao Jiang,Lin-Bing Sun
Silver (Ag)-based nanoparticles are one type of highly effective antimicrobial widely used in medical devices, consumer products, and wound dressing. Although Ag(I) rather than Ag(0) is the active species in antibacterial processes, the use of Ag(I) as antibacterial materials is hindered by its instability toward light irradiation. In this paper, we report the fabrication of core–shell AgCl@SiO2 nanoparticles, which comprise a core of AgCl nanoparticles and a shell of porous silica, for antibacterial applications for the first time. The porous silica shells not only enhance the stability of AgCl by preventing the core from direct light irradiation but also allow active Ag(I) to pass through continuously to inhibit the growth of bacteria. It is worth noting that the synthesis is achieved by a facile one-pot method in which the surfactant hexadecyltrimethylammonium chloride used for the formation of AgCl nanoparticles also acts as a structure-directing agent in the subsequent creation of porous silica. Our results show that the obtained AgCl@SiO2 nanoparticles exhibit well-defined core–shell structure and are highly efficient in the growth inhibition of Escherichia coli. More importantly, the stability of Ag(I) toward light irradiation is greatly enhanced by the protection of the silica shell. The convenient fabrication, well-defined core–shell structure, and enhanced stability make AgCl@SiO2 nanoparticles highly promising for antibacterial applications.
研究领域:
材料科学
·
微生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Rong Li,Shidong Ji,Yamei Li,Yanfeng Gao,Hongjie Luo,Ping Jin
Rectangular and plate-like VO 2 (M)@SiO 2 nanoparticles were fabricated by a combination method of hydrothermal synthesis and post annealing process. Rectangular VO 2 (B) nanoplates of 20–30 nm in thickness were hydrothermally synthesized, and VO 2 (B)@SiO 2 core–shell structure was formed using a modified Stober method. Protected by inert SiO 2 shell, after post annealing the VO 2 (B)@SiO 2 was transformed to VO 2 (M)@SiO 2 without deteriorating its original plate-like morphology. Much interestingly, numerous nanopores were formed inside VO 2 (M)@SiO 2 nanoparticles due to the difference in density between VO 2 (B) and VO 2 (M), which contributes to higher optical transmittance and thermal insulation . Thermochromic foils were fabricated using the core–shell nanoparticles, showing promising potential for smart window.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）