INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2024
·
IF 5
Le Lyu,Guanqiu Hao,Yuhao Wang,Yingying Chen,Yongping Chen,Xiangdong Liu
This study presents a microfluidic approach for fabrication of compound phase change fibers (CPCFs) encapsulating nano-enhanced phase change material (PCM), RT25, for thermal regulation. The produced fibers are flexible and have strong compatibility and durable stability, with their size and the proportion of PCM can be precisely controlled by the microfluidic approach. Especially, a hydroxy surface modification method was used to uniformly disperse SiO 2 nanoparticles into the RT25, aiming to enhance the thermal regulation performance of the CPCFs. Thermal performance test was conducted and it indicated that, compared with the compound phase change fiber (CPCF) with pure RT25, the CPCF incorporated with 2 wt% SiO 2 nanoparticles presented a notable increase in thermal conductivity by 46.52 % and 45.51 % for solid-state and liquid-state enclosed PCM with a limited reduction in both melting and solidification enthalpies by 9.21 % and 10.1 %, respectively. Moreover, an experiment simulating the heat dissipation scenario of the electronic cabinet under intermittent running with short operation and long rest was conducted by using the CPCFs. It showed that adding SiO 2 nanoparticles can improve the heat absorption process (solid-to-liquid phase) via the CPCFs with a smaller temperature increase (i.e., the maximum temperature of simulated inner electronic device in the cabinet for the repeated intermittent running) and it is also able to make the CPCFs renew (liquid-to-solid phase) more quickly and ready for heat absorption process in the next cycle. These CPCFs offer a promising alternative for more efficient and sustainable thermal management of the electrical/electronic equipment.
研究领域:
材料科学
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热能工程
·
纳米技术
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jialong Wu,Xiaozhen Ma,Pitchaimari Gnanasekar,Fan Wang,Jin Zhu,Ning Yan,Jing Chen
Superhydrophobic polyurethane foam is one of the most promising materials for oil-water separation. However, there are only limited studies prepared matrix superhydrophobic foams as adsorbents. In this paper, SiO 2 modified by 1H, 1H, 2H, 2H-perfluorododecyl trichlorosilane (F-SiO 2 ) was added into the lignin-based foam matrix by a one-step foaming technique. The average diameter of F-SiO 2 was about 480 nm with an water contact angle (WCA) of 160.3°. The lignin-based polyurethane foam with F-SiO 2 had a superhydrophobic water contact angle of 151.3°. There is no obvious change in contact angle after 100 cycles of compression or after cutting and abrasion. Scanning electron microscopy (SEM) analysis showed that F-SiO 2 was distributed both on the surface and inside of the foam. The efficiency for oil-water separation reached 99 %. Under the light intensity of 1 kW/m 2 , the surface temperature of the lignin-based foam rose to 77.6 °C. In addition, the foam exhibited self-cleaning properties and degraded within 2 h in an alcoholic alkali solution. Thus, in this study, we developed a novel matrix superhydrophobic lignin-based polyurethane foam with an excellent promise to be used as oil water separation adsorbents in industrial wastewater treatment and oil spill clean-up processes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8581-8590
·
IF 3.442
Huang Xie-Jun,Zeng Xiao-Fei,Wang Jie-Xin,Zhang Liang-Liang,Chen Jian-Feng
Transparent ZnO/polymer nanocomposites with good UV shielding performance have shown great potential applications. Due to the photocatalytic activity of ZnO, core–shell structure nanoparticles (NPs) have been used to fabricate the transparent polymer-based nanocomposites. However, it is still a challenge to synthesize core–shell structure NPs with small particle size and good dispersity, and difficult to maintain the transparency of the nanocomposites because of Rayleigh scattering caused by the big size or the aggregation of NPs. This article reports a novel reverse microemulsion combined with surface modification method for the synthesis of monodispersed silica-coated ZnO (ZnO@SiO 2 ) NPs, which are introduced into ethocel (EC) matrix to fabricate the transparent nanocomposites by the solution-mixing method. The ZnO@SiO 2 NPs with an average size of 12 nm have an obvious core–shell structure and show excellent monodispersity in toluene. The as-prepared EC/ZnO@SiO 2 nanocomposites shield all the UV light completely under 350 nm and maintain the transparency of pure EC even the solid content reaches 60 parts per hundred of EC resin by weight (phr). Importantly, the photocatalytic activity of ZnO NPs is eliminated thoroughly by the silica shell, which apparently improves the UV aging resistance of polymer (EC), enabling the applications of ZnO as durable and environmental friendly UV blocker in transparent plastics and coatings to extend the lifetime of the products.
研究领域:
材料科学
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纳米技术
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 24
·21089-21095
·
IF 2.195
Sun Fan,Chen Guixiong,Zhou Xiongtu,Wu Chaoxing,Sun Lei,Yan Qun,Guo Tailiang,Zhang Yongai
Thin-film encapsulation (TFE) is essential and challenging for flexible organic/quantum dot light-emitting diodes (OLEDs/QLEDs). In this work, SiO 2 nanoparticles were added into the NEA 121 polymer (s-NEA) to prolong the permeation pathways, showing good barrier property and high optical transparency. With increasing the concentration of SiO 2 nanoparticles up to 20 mg/ml, the value of water vapor transmission rate (WVTR) decreased. A single s-NEA layer with silica concentration of 20 mg/ml and thickness of ~ 75 µm exhibited WVTR of 2.5 × 10 −3 g/m 2 /day and light transmittance of above 80%. Al 2 O 3 thin films fabricated using atomic layer deposition were inserted between s-NEA layers to form dyad-style Al 2 O 3 /s-NEA multilayers. The Al 2 O 3 (60 nm)/s-NEA (20 µm) multilayers with 3 units exhibited WVTR of 2.6 × 10 −5 g/m 2 /day and consistently demonstrated a significantly extended QLED lifetime.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Han Jia,Xuehao Zhang,Qiuxia Wang,Yingbiao Xu,Lingyu Zhang,Jiajun Dai,Yuanbo Wang,Qiuyu Xie,Haidong Jia,Lin Song
Wormlike micelles (WLMs) with superior viscoelasticity exhibited great potential application in petroleum industry. Compared with polymer systems, the relatively low viscoelasticity of WLMs should be further improved effectively. In this study, the amphiphilic Janus-SiO 2 nanoparticles (JAnC NPs, n represents the carbon atoms number of modified alkyl chain) were successfully fabricated, which were verified by Fourier transform infrared spectra and water contact angle measurements. Then the effects of additional JA3C NPs on the viscoelasticity of WLMs solutions formed by stearyltrimethylammonium bromide/sodium salicylate were systemically explored via rheology behavior and cryo-TEM pictures. Compared with original isotropic SiO 2 NPs, the amphiphilic JAnC NPs showed greater ability to improve the WLMs viscoelasticity. To explore the enhanced mechanism, the zeta potential of STAB/SiO 2 dispersions and the viscosity of WLMs formed by various surfactants with additional JAnC NPs were studied in the controlled experiments. In addition, a mathematical model was employed to calculate the quantity of junctions between micelles and NPs in different WLMs/NPs systems to confirm the proposed mechanism. This work firstly investigated the effects of the novel Janus-SiO 2 NPs on the WLMs viscoelasticity.
研究领域:
材料科学
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石油工程
·
胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Xia Zhao,Hong Hao,Haixia Pang,Min Jiang,Yanping Duan
Emulsifier-free polymerization was employed to prepare the submicron spherical PSA (the copolymer of styrene and acrylic acid), then SiO 2 was grown on the surface of the PSA by sol-gel method to form F–SiO 2 @PSA particles. It was found that when styrene: acrylic acid = 2.5:1 and tetraethyl orthosilicate : PSA was between 2.17:1 and 6.38:1, a perfect raspberry-like structure could be obtained. The coating based on F–SiO 2 @PSA particles exhibited contact angles of 167.3 ± 1.4°, 152.1 ± 1.5°,150.3 ± 1.6°, 150.9 ± 1.6°, 142.2 ± 1.7°, 143.7 ± 1.5° and 146.6 ± 1.9° to water, diiodomethane, soybean oil, rapeseed oil, hexadecane, kerosene, and waste engine oil , respectively. The F–SiO 2 @PSA coating could reduce the adsorption of protein by 90% compared with the control surface . It was observed that bacteria and platelets could hardly adhere to the coating surface after 24 h of E. coli culture and 3 h of platelet-rich plasma immersion. The anti-adhesion to proteins, platelets, and bacteria will give the coating a promising application in the medical field.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 1
·199-205
·
IF 1.65
Zhang Wanying,Huang Yingnan,Gong Hua,Dang Fei,Zhou Dongmei
Metal dioxide nanoparticles (NPs) are produced in ever-increasing amounts and widely used in industrial, medical and consumer products. They may pose potential risks to the environment. In this study we quantitatively evaluated the phytoavailability of CeO 2 NPs, ZrO 2 NPs and SiO 2 NPs to wheat ( Triticum aestivum L.). Metal dioxide NPs showed distinct differences in uptake, with uptake rate constants of 90.2 ± 9.9, 12.2 ± 2.5, 0.4 ± 0.02 and 0.9 ± 0.1 L kg −1 h −1 for ZrO 2 NPs, CeO 2 NPs, SiO 2 NPs (13 nm) and SiO 2 NPs (25 nm), respectively. However, such difference cannot be generalized by single factor of NP characteristics and/or root damage. This study provides fundamental information for NP uptake by crop plants.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Chuanjin Lin,Guoquan Suo,Jiarong Li,Rongrong Mu,Laraib Habib,Xiaojiang Hou,Shukai Ding,Jianfeng Zhu
Water-induced deterioration poses a significant threat to sandstone cultural heritage, necessitating effective protective measures. This research investigates a fluorine dual-modified nanocomposite coating composed of nanoplate-like TiO 2 and nanoparticle SiO 2 , utilizing 1H, 1H, 2H, 2H-perfluorodecyl triethoxysilane as the modifier. The study aims to optimize the modifier concentration for enhanced hydrophobicity , while also assessing the coating’s penetration depth and its effect on sandstone breathability. An optimal formulation, consisting of a TiO 2 -to-SiO 2 mass ratio of 75:25 combined with 80 µL of the perfluorodecyl triethoxysilane modifier, yielded exceptional water and oil contact angles of 150.1° and 139.3°, respectively. Even after 210 h of UV exposure, the coating exhibited remarkable stability, with only a minor decrease in contact angles. Furthermore, the treatment effectively preserved the air permeability of the sandstone. This F-modified nanoplate TiO 2 /nanoparticle SiO 2 composite coating demonstrates significant potential for the long-term protection of sandstone cultural relics against environmental weathering, offering a balance of high hydrophobicity and breathability.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Yajing Yang,Fenglin Li,Dayin Sun,Yilan Ye,Zhenzhong Yang
A new method is proposed to large-scale synthesize reactive Janus inorganic/polymer colloidal dimers by electrostatics-mediated intramolecular crosslinking of the tethered diblock copolymer single-chain of PVSt-b-PmSt at an example inorganic NP of Fe3O4@SiO2. Tethering the single-chain is achieved by terminating the anionic living polymer onto the chloromethylphenyl- group capped NP. While the electrostatic interaction is introduced by complexation of the mercaptoacetic acid (MA) clicked PVSt block with 1-methylimidazole (MI), the intramolecular crosslinking is achieved with 1,6-hexanediisothiocyanate (HDI). The example dimer of cPVSt-b-PmSt-Fe3O4@SiO2 could be synthesized in a highly concentrated dispersion up to 100 mg/mL. The amphiphilic Janus colloidal dimer is effective to manipulate the stabilized emulsion droplets with a magnet. The parent colloidal dimer is highly reactive with residual chloromethylphenyl-, cyanate, and carboxylic acid groups at different sites to assist deriving a family of functional dimers by simple modifications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 7
·1043-1051
·
IF 1.401
Zhao Aixia,Xu Zhiqiang,Ma Liyi,Tian Zhenfeng,Gan Wuer
We report on the synthesis of Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column via in situ polymerization. The monolith had larger specific surface area and relatively uniform porous structure and was characterized by scanning electron microscopy, nitrogen adsorption–desorption, and Fourier transform infrared spectroscopy. The monolith was then applied for the evaluation of gas chromatography separation properties. Here, an electromagnetic induction heating technique was employed to control the column temperature with the thermal effect of eddy current in ferromagnetic materials Fe 3 O 4 . The monolith offered good separation efficiency for benzene and toluene and a higher column efficiency was obtained up to 4481 and 9216 plates per meter, respectively. In addition, the injection volume and column capacity of the proposed system are as much as 5 µL and 100 ng. This makes it possible to use a UV detector. The fabricated Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column has been shown to be very promising for gas chromatography separation. Graphical Abstract
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Donghui Wang,Jiakang Xu,Jinlong Yang,Shuxue Zhou
Confronting the complexity of marine biofouling, no single ecofriendly technology has been reported for efficient anti-biofouling. Combination of multiple antifouling factors should be one of the strategies for strengthening the anti-biofouling performance. Here we synthesized quaternary ammonium modified SiO 2 nanoparticles (QAS-SiO 2 ) and incorporated them into self-polishing polymer (SP) to get the coatings combining self-renewal ability, micro-nano structured topography, and bactericidal function. The coatings acquired underwater superoleophobic surface after immersion in artificial seawater due to their micro-nano structured surface together with the hydrolyzed SP. In comparison with unmodified SiO 2 , QAS-SiO 2 had better compatibility with SP and caused less increment of self-polishing rate. Synergistic antifouling effect was interestingly observed between self-renewal ability and bactericidal function in both the laboratory assay based on the adhesion of Shewanella loihicas and natural field trial. The micro-nano structured topography contributed to underwater superoleophobicity but did not exhibit its impact on antifouling performance. QAS-SiO 2 can also slightly inhibit the adhesion of diatoms and reduce the settlement of plantigrades of the mussel. In addition, we also demonstrated the coatings with lower quantity of biofilm exhibited less settlement of plantigrades of mussel.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·563
·
IF 3.4
Chengqian Li,Peng Dou,Ruyi Zhao,Yurou Shi,Gaojie Fu,Bin Shen
Pollution flashover on insulators is one of the greatest challenges affecting the smooth operation of high-voltage transmission lines. Demonstrating super-hydrophobic coatings on insulators’ interfaces is an effective measure to prevent insulator flashovers. In the present investigation, a super-hydrophobic FAS-17-modified SiO2/PDMS coating on a composite insulator was demonstrated by spraying. The coating had a contact angle of 159.2° and a sliding angle of 1.3° with better insulation properties. The prepared FAS-17-modified nano-SiO2nanoparticles were not easy to agglomerate; to illustrate this, the binding energy was calculated by the density functional theory. The super-hydrophobic mechanism of the coating was explained in terms of the adsorption energy between SiO2molecules and water before and after modification. This paper provides a new method to solve the pollution flashover problem of insulators and a new angle to explain the super-hydrophobic mechanism.Keywords:super-hydrophobic;composite insulators;FAS-17-modified SiO2nanoparticles;de-agglomeration mechanism;super-hydrophobic mechanism;density functional theory
研究领域:
材料科学
·
电气工程
·
表面化学
✓ 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）