COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Fan Hu,Feng Qi,Zehui Xiang,Biao Zhang,Fugang Qi,Nie Zhao,Xiaoping Ouyang
A nano-polymer (IL@SiO 2 ) was synthesized by double bond polymerization and creatively applied to polyurethane elastomer (PUE-IL@SiO 2 ). The mechanical properties and energy absorption of PUE-IL@SiO 2 at static compression and dynamic impact were studied, respectively. The results show that: compared with pure PUE, the static compressive properties and dynamic impact resistance of PUE with a loading of IL@SiO 2 of 2wt% are the best, and the static and dynamic compressive yield strength are improved by 216.15% and 190.68% compared with PUE respectively. Moreover, the energy absorption of PUE-2%IL@SiO 2 is improved by 18.87% compared with PUE. The composite materials (PUE-2%IL@SiO 2 ) also has excellent deformation recovery performance. These outstanding mechanical properties illustrate the IL@SiO 2 is excellent impact resistance and reinforcing materials for PUE.
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
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 11
·2300002
·
IF 2.5
Chen Dong,Jing Gao,Yunting Zhao,TianTian Ma,Yongjun He
The recovery of indium from impregnating resins in water is usually limited by the poor bonding of the extractant to the carrier resin. Pickering emulsion hydrogels (PEHGs) encapsulating extractant bis(2-ethylhexyl) phosphate are prepared by oil-in-water Pickering emulsions polymerization method using polyvinyl alcohol and sodium alginate as continuous phases and nano-SiO 2 and alkylphenol ethoxylates-10 (OP-10) as emulsifiers. PEHGs are used to recover trivalent In(III) from water to study its encapsulation and adsorption properties. Pickering emulsions are characterized by optical microscopy. PEHGs are characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The results showed that the stabilization time of Pickering emulsions improved from 3 min to ≈14 days after the addition of 5 wt.% of OP-10. The internal structure of 4 -Pickering emulsion hydrogels ( 4 -PEHGs) prepared from Pickering emulsions co-stabilized by nano-SiO 2 and OP-10 is changed from core-shell to honeycomb structure and no oil phase leakage occurred. In(III) adsorption is carried out on 4 -PEHGs. The results showed that the maximum adsorption of In(III) in water by 4 -PEHGs is 18.03 mg g −1 . The adsorption process of In(III) is controlled by chemisorption. This study showed that 4 -PEHGs can be used as an effective adsorbent for the recovery of indium in water.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xigao He,Chuanrong Zhong,Guangyu Zeng,Enzhe Pu,Xu Zhu
A biological polymer S-657 (namely BLG) was compounded with nano-SiO 2 to obtain a workover fluid thickener applied in ultra-deep wells. This composite system is expected to improve the thermal stability of single BLG in brines containing high salinities and multi-valent salts at high temperatures. The thickening properties of the unaged BLG/nano-SiO 2 brines were slightly enhanced compared with the BLG brines. However, the anti-aging ability and the salt resistance of BLG could be reinforced significantly by the introduction of nano-SiO 2 at 140 °C in brines with high salinities, especially in mixed brines containing mono- and multi-valent salts. After aging at the high temperature for the BLG/nano-SiO 2 aqueous solution, stretched polymeric chain bundles and integrated aggregating structures complexed with nano-SiO 2 were still observed by TEM , resulting in a significant enhancement of the thickening property. The compound of nano-SiO 2 could keep the pseudoplastic and thixotropic performance of the BLG brines during the aged process at a high temperature. In contrast to the single BLG mixed brine, the viscoelastic property of the BLG/nano-SiO 2 mixed brine was still remarkable after aging for 16 h at 140 °C.
研究领域:
石油工程
·
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yinjie Ma,Ping Wang,Qingmiao Wang,Fengmei Ding
Aqueous emulsion polymerization prepared a nano-SiO 2 polyacrylate fluorine-free anti-fouling finishing agent in this study. The finishing agent was prepared by copolymerizing nano-SiO 2 modified by KH-570 silane coupling agent with 3-[Tris(trimethylsilyloxy)silyl]propyl methacrylate (M3T) and stearyl methacrylate (SMA). The polymer emulsion has a uniform particle size distribution and can meet the use temperature below 160 °C. It also has good stability under solid acid/alkali conditions. The prepared anti-fouling finishing agent was applied to the cotton fabric by a two-dip and two-roll finishing process, and a polymer film containing nanoparticles can form on the surface of the cotton fiber. The experimental results showed that the finished cotton fabric’s apparent roughness increases, making it superhydrophobic. The water contact angle of the finished cotton fabric is 159 °, and it is still not lower than 150 ° after 10 washing cycles and 50 abrasion cycles. At the same time, it also has an excellent water-repellent function, and the spray test score reaches 100 (iSO-5). In addition, the coffee grounds sprinkled on the surface of the finished cotton fabric can roll off with the droplets, showing its self-cleaning ability. Most importantly, it has a specific anti-vegetable oil function because common vegetable oil can stay on its surface for 5 min without thoroughly wetting. It is worth noting that the preparation process is economical, environmentally friendly, and fluorine-free.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Ru-Jun Chen,Yi-Bo Zhang,Ting Liu,Bingqing Xu,Yang Shen,Liangliang Li,Yuan-Hua Lin,Ce-Wen Nan
A simple way to assemble an all-solid-state lithium-ion battery with ultrahigh surface capacity and energy density was established. Polyethylene oxide-based solid-state electrolyte was prepared via solution method and nano-SiO 2 was added into the electrolyte to increase the conductivity. Thick compact LiFePO 4 pellet infused with dry polymer electrolyte was used as the composite cathode in the all-solid-state lithium battery . The compact composite cathode not only showed large ionic and electronic conductivity , but also provided sufficient “free space” to compensate the volumetric change of the active materials during cycling. The all-solid-state lithium battery (composite cathode/dry polymer electrolyte/Li) was cycled at a constant current density of 200 μA/cm 2 at 60 °C. A maximum discharge specific capacity of 157 mAh/g was achieved and the surface capacity reached 15 mAh/cm 2 , which was of critical significance for all-solid-state lithium batteries. Good capacity retention was achieved after 10 cycles and great rate performance was obtained. Even at a current density of 1000 μA/cm 2 , the battery delivered a specific discharge capacity of 71 mAh/g, corresponding to a surface capacity of 6 mAh/cm 2 . The experimental data demonstrated that the composite cathode was a promising design in high-performance bulk-type all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Kai Luo,Jun Li,Qing Han,Zhongyuan Lu,Xin Deng,Li Hou,Yunhui Niu,Jun Jiang,Xiaoying Xu,Pan Cai
As an ideal cementitious material for the maintenance of historic buildings and the replacement of interior decoration mortars, the widespread application of natural hydraulic lime (NHL) is expected to play an important role in CO 2 capture and utilization. Structures and properties of NHL2 mortars with nano-SiO 2 (NS) under carbonation were researched in this paper. NHL mortars could capture CO 2 during hardening process of air-hardening contents, and the captured CO 2 would be fixed in the matrix to form CaCO 3 . Carbonation percentage and extent of NHL2 mortars increased by the addition of NS whatever in atmospheric or accelerated carbonation condition. Much more compacted carbonation surfaces than that of the uncarbonated region for NHL2 mortars with NS was observed. The addition of NS will reduce the porosity and big pores (approximately 1 μm) while increase the mesopores (approximately 50 nm) of the mortars. Carbonation reaction of NHL2 mortars seemed to be improved by the addition of NS, which would be beneficial to the collection, solidification and further utilization of CO 2 .
研究领域:
建筑材料学
·
环境科学
·
土木工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Guomin Wu,Di Liu,Jian Chen,Guifeng Liu,Zhenwu Kong
Nanocomposite films with super hydrophobic surface were prepared by building rough micro/nano structure on the surface of siloxane-modified two-component waterborne polyurethane (2K-WPU) with hydrophobic nano SiO 2 . Firstly, nano SiO 2 prepared by StÖber method with tetraethoxysilane (TEOS) as precursor was modified with trimethylethoxysilane (TMES), in order to cover a layer of hydrophobic methyl groups on the surface of nano SiO 2 . Then, a series of nanocomposite films with different water contact angles were obtained by adding different contents of TMES modified SiO 2 into the siloxane-modified 2K-WPU. The effects of the content of nano SiO 2 on the morphology and hydrophobicity of film surface were investigated. The results showed that the surface structures of the nanocomposite films became rougher and the water contact angle of nanocomposite films was increased obviously with the increase of the content of hydrophobic nano SiO 2 . Super hydrophobic nanocomposite film with water contact angle over 150° was successfully fabricated by using polysiloxane as low surface energy material and hydrophobic nano SiO 2 as micro/nano rough structure builder on the polymer surface. Moreover, incorporating nano SiO 2 into the 2K-WPU matrix could increase the glass transition temperature and thermal stability of the nanocomposite films.
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
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Rui Liu,Wan-Fen Pu,Dai-Jun Du
A novel core–shell polymer (HBAPAM) with functionalized nano-SiO 2 as core, multibranched associative polymeric chains as shell was synthesized through in-situ free radical polymerization strategy. TGA, IR, 1 H NMR, and SEM proved the notion and method of preparing of HBAPAM was applicable. The core–shell structure and multibranched morphology enhanced the supramolecular interaction of HBAPAM, which displayed the desirable viscosified efficiency and viscoelasticity, especially, long-term stability in harsh temperature and salinity condition. HBAPAM featured the rheology in multiscale consistently in deionized water and formation water. Core flooding experiments confirmed that HBAPAM had high cost performance in the variable permeability of oilfields.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Huangyu Yan,Guojie Zhang,Jun Liu,Guoqiang Li,Yuqiong Zhao,Ying Wang,Chenlei Wu,Yongfa Zhang,Ying Xu
Supports and the organic amine type are the main factors affecting the performance of adsorbents. Currently, researchers are focusing on the development of supports, but their high cost limits the applications. In addition, there is a lack of studies on the mechanism of matching organic amines to supports. This paper presents a feasible strategy including the preparation of low-cost mesoporous nano-SiO 2 (B-SiO 2 ) support from blast furnace slag (BFS). A series of adsorbents were obtained by impregnating with different organic amines on the B-SiO 2 support to identify the most suitable amine type for B-SiO 2 . The results showed that the matching degree four amines with B-SiO 2 was TETA > TEPA > PEHA > PEI in order. TETA at 35 wt.% was the best matched amine for B-SiO 2 , exhibiting the highest CO 2 adsorption capacity of 112.89 mg/g and the best adsorption energy E ads = −87.21 kJ/mol at 80 ℃. This is mainly due to two reasons. On the one hand, TETA is easily dispersed in the pores of the support, which not only effectively prevents the agglomeration effect and improves the accessibility of the active site, but also facilitates the inhibition of amine leaching. On the other hand, TETA has the least steric hindrance and the highest affinity for CO 2 , thus reducing the mass transfer resistance and improving the adsorption performance. In addition, four adsorption kinetic models were developed. The Avrami model was the best fit for four adsorbents. It indicates that the adsorption mechanism of this type of adsorbent is a combination of physical and chemical adsorption. This study reveals the matching rules between amine species and supports, and provides theoretical guidance for the preparation of solid amine-based adsorbents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 33
·25383-25391
·
IF 2.779
Zhang Cong,Liu Xiansong,Kan Xucai,Feng Shuangjiu,Zhu Yong,Yang Yujie,Zhang Zongyang
Soft magnetic composites serve in electrical applications and sustainable energy supply, the magnetic flux changes in response to changes of the applied magnetic field, with energy loss. To reduce the loss, in this paper, the soft magnetic composite Fe 50 Ni 50 powder coated with nano-SiO 2 was prepared by tetraethoxysilane sol–gel method, and the microstructure of the coating was characterized. Then, soft magnetic Fe 50 Ni 50 powder cores have been prepared, and annealed with different atmospheres. The power loss is lower when the magnetic cores were annealed in a reducing hydrogen atmosphere. The lowest power loss (1390.7 mW/cm 3 , f = 1000 kHz, B = 50 mT, 120 °C) was obtained when the cores annealed at 730 °C in H 2 atmosphere. The results show that the eddy current loss is significantly reduced by coating SiO 2 , and the power loss is reduced about 33% in high-frequency (1 MHz and 50 mT, 25 °C). From 25 to 120 °C, the power loss at 1 MHz decreases by about 33% due to the reduction of hysteresis loss and eddy current loss. The excellent properties are very applicable for the inductors of 5G technology.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Runzhuo Cao,Junfen Yang,Guoxin Li,Qun Zhou,Mengdie Niu
Exposure of cement-based structures to sulfuric acid environments can cause significant degradation. Therefore, this study focuses on the effect of nano-SiO 2 on the sulfuric acid resistance of ordinary Portland cement (OPC)-sulfoaluminate cement (SAC) composites (as repair material). Samples were exposed to three concentrations of acid solution. The degradation kinetics, chemistry, and microstructures of the composites were analyzed. The results of degradation kinetics (dimensional change, mass and strength loss) showed that the nano-SiO 2 modified composites had a lower degradation rate compared to the composites without nano-SiO 2 . XRD, TG, MIP and SEM analyses demonstrate that nano-SiO 2 promoted hydration and improved structural compactness, which can not only enhance the diffusion resistance of composites to H + and SO 4 2- , but also form a protective barrier in acid environments. However, diffusion–dissolution-precipitation is still the main mode of degradation in composites subjected to sulfuric acid attack, regardless of nano-SiO 2 content mixed into the composite system.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9698-9707
·
IF 4.5
Zhang Cong,Chen Yanan,Feng Shuangjiu,Kan Xucai,Zhu Yong,Li Yue,Sun Wei,Shen Jibiao,Liu Xiansong
Currently, soft magnetic composites (SMCs) are usually used for high-current power devices. As a kind of SMCs, the FeSiAl magnetic powder core exhibits excellent magnetic properties, but it is difficult to improve its permeability and DC-bias characteristics. Thus, developing SMC s with high permeability and lower power loss remains a challenge. Here, the FeSiAl powder was mixed with carbonyl iron powder (CIP) which coated with nano-SiO 2 and pressed into toroidal magnetic core with silicon resin as adhesive. For MHz frequency, the SMCs with excellent power loss, saturation magnetization and permeability were obtained. Saturation magnetization of the mixed powder increased markedly with the CIP content increasing. For magnetic powder cores, the SEM and the mappings show that the large deformation CIP was helpful to improve core density. With the addition of CIP, the permeability and DC-bias properties were improved. In addition, the power loss was greatly reduced by the optimized annealing temperature.
研究领域:
材料科学
·
电磁学
✓ 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）