Processes
·
2023
·Vol. 11
·期 4
·1159
·
IF 3.5
ZhengNan Sun,Biao Yan,GuoLin Jing,YiHai Yang,HongJing Li,FuNing Zhang
Differences in the synthesis methods can affect the performance of nanocomposite materials. The synthesis methods of SiO2-based nanocomposite pour point depressants synthesized by chemical hybrid are mostly in situ polymerization and chemical grafting. However, there are still some gaps in the synthesis of nanocomposites using chemical grafting. In this paper, the amino-modified Nano-SiO2and octamethyl methacrylate-maleic anhydride copolymer was used to prepare PM18-g-NSiO2by an amidation reaction, and the product was compared with PM18/SiO2prepared by the solution blending method. The characterization results of FT-IR and SEM showed that the chemical bond formed between PM18 and NSiO2and PM18-g-NSiO2showed a more regular morphology structure. The results of rheological tests showed that the optimal concentration of PM18-g-NSiO2and PM18/SiO2is 300 mg·kg−1, but the decrease of PM18-g-NSiO2is 19 °C, while the decrease of PM18/SiO2is only 13 °C. The lowest viscosity of model oil added PM18-g-NSiO2was only 214 mPa·s while PM18/SiO2reached 453 mPa·s. The wax crystal structure after adding PM18-g-NSiO2is also more regular and smaller compared to PM18/SiO2. We concluded that differences in the synthesis methods may lead to the different coverage of the polymer on the surface of the nanoparticle.Keywords:nano-SiO2;polymethacrylate;nanocomposite pour point depressant;flow properties;wax crystal
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
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2017
·Vol. 89
·期 10
·1681-1693
·
IF 0.375
Lai Nanjun,Wu Tao,Ye Zhongbin,Zhou Ning,Xu Qian,Zeng Fanhua
A novel water-soluble hyperbranched polymer (AA/AM/SMNS) consisting of functionalized Nano-SiO 2 as the core was synthesized by free-radical polymerization for low-moderate permeability reservoirs. The AA/AM/SMNS was carefully characterized by spectroscopic and electronic technologies. It was found that the microscopic structures of AA/AM/SMNS was denser and more regular in comparison to the linear polymer HPAM. The hydrodynamic radius of AA/AM/SMNS was 197 nm, less than the HPAM radius of 244 nm with similar molecular weight, so that the AA/AM/SMNS had a good matching relationship with pore throat in midpermeability reservoirs (100–500 mD). Besides, the introduction of Nano-SiO 2 endowed the AA/AM/SMNS remarkable thermal stability, shear resistance and viscoelasticity. Based on core flooding experiments, the AA/AM/SMNS could build high resistance factor and residual resistance factor in the corresponding porous medium. Furthermore, the sheared AA/AM/SMNS solution of 1500 mg L–1 performed excellent oil recovery of 15.47% in the 300 mD porous medium, which suggested the hyperbranched polymer based on modified Nano-SiO 2 have a valuable prospect for enhancing oil recovery in low-moderate permeability reservoirs.
研究领域:
材料科学
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石油工程
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化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yihui Ma,Fangli Zhang,Kun Chen,Yue Zhou,Zhaohui Wang,Zhaoliang Cui
As a new separation technology, membrane condensation requires simple equipment and mild operating conditions and has wide application potential and value in the process of water vapor recovery and chemical concentration and recovery. In this paper, we have proposed a new application process to incorporate nano-SiO2 into ECTFE membranes and apply them in the membrane condensation process. The fabrication of ethylene-chlorotrifluoroethylene copolymer (ECTFE)/SiO2 hybrid membranes is performed by incorporating hydrophobic nano-SiO2 during ECTFE membrane preparation, with varying ECTFE/SiO2 compositions achieved through SiO2 dosage adjustments. It can be found that SiO2 can change the structure of membrane during the process; hence, the impact of SiO2 removal after membrane formation on membrane performance was evaluated. SiO2 removal was conducted using a 1 mol/L hot alkali solution with continuous agitation for 24 h. A maximum water recovery rate of 24% (adequate for industrial water self-sufficiency) was attained at 2 wt % SiO2. Compared with the original membrane, the addition of hydrophobic nano-SiO2 significantly enhances the condensation performance of the ECTFE membrane.
研究领域:
化学工程
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材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 12
·6832-6839
·
IF 10.733
Yinghua Zhu,Jiang Cao,Hong Chen,Qipeng Yu,Baohua Li
Polymer electrolytes have attracted great attention due to their promising abilities, however, only on further improving their safety and electrochemical performance can they be used as next generation electrolytes. Here, a novel composite polymer electrolyte (CPE) with nano-SiO2 acting as a cross-linking agent to form a 3D cross-linked network was synthesized to improve the electrochemical stability and mechanical ability. The novel CPE exhibited some excellent properties such as high ionic conductivity (4.65 × 10−3 S cm−1 at room temperature) with a broad electrochemical stability window (∼5.4 V vs. Li/Li+), high ionic transfer number (0.45), high mechanical robustness and flexibility (Young’s module ∼8.9 MPa, breaking strain 181%), and excellent interface stability. The lithium metal battery LiFePO4/CPE/Li was assembled and delivered a specific capacity of 160 mA h g−1 with a capacity retention of above 90% after 500 cycles at 1C. Furthermore, to cooperate with high voltage cathode materials LiNi0.8Co0.1Mn0.1O2 and LiNi0.5Mn1.5O4, the novel CPE still delivered superior cycling performance compared to traditional electrolytes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
REVIEWS ON ADVANCED MATERIALS SCIENCE
·
2022
·Vol. 61
·期 1
·186-194
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IF 5.028
Yunfeng Liu,Lili Chen,Yongfan Tang,Xingde Zhang,Zhengsong Qiu
Aiming at the current situation that the existing acidizing corrosion inhibitors are difficult to apply in high temperature, high concentration acid, and other complex conditions, this article uses nano-SiO 2 as the core and preferably functional monomers to synthesize nano-SiO 2 @octadecylbisimidazoline quaternary ammonium salt (nano-SiO 2 @OBQA). Analytical methods such as nuclear magnetic resonance, infrared, and scanning electron microscopy were used for characterization. The corrosion inhibition performance of the N80 steel sheet by nano-SiO 2 @OBQA in 20% concentrated hydrochloric acid was studied using the high-temperature corrosion testing machine and adsorption isotherm model combined with quantum chemistry calculations to explore its mechanism of action. The results show that nano-SiO 2 @OBQA has good high-temperature resistance. When the temperature is 180℃ and the dosage of nano-SiO 2 @OBQA is 4%, the corrosion inhibition rate is 61.42 g·m −2 ·h −1 . Studies have shown that the adsorption of nano-SiO 2 @OBQA on the surface of the N80 steel sheet follows the Langmuir isotherm adsorption model, which is spontaneous chemical adsorption.
研究领域:
材料科学
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化学工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Lang Guo,Liqin Wang,Xing Zhao,Meiman Peng
s Superhydrophobic coatings have shown great potential in heritage protection due to their excellent wetting resistance, yet whitening problems have limited their widespread use. Here, we present a non-whitening superhydrophobic coating of nano-SiO 2 and perfluorodecyltrimethoxysilane for cultural heritage protection, prepared with the assistance of an ultrasound probe. Due to the high efficiency of the probe sonication , the nanoparticles almost retain their original size, and a porous micro–nano hierarchical structure on the surface is formed, as a result, a non-whitening superhydrophobic coating was obtained. The coating exhibits a high water contact angle of 154.7° and a low roll-off angle of 1.7°, dynamic wetting properties such as anti-jet impact, anti-adhesion, anti-evaporation pressure of droplets, rolling, bouncing, anti-fouling and self-cleaning, and long-term resistance to heat, 254 nm UV radiation , acid, alkali, and sand impact. This coating is suitable for bronze, iron, pottery, sandstone, ivory, lacquer, and other artifacts, and has the potential to address various water-related diseases.
研究领域:
材料科学
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文物保护
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 11
·2636
·
IF 3.2
Zian Geng,Yu Zhang,Yiwen Zhou,Jiapeng Duan,Zhuqing Yu
Solid waste-based cementitious materials (SWBC) are composed of steel slag (SS), granulated blast furnace slag (GBFS), fly ash (FA), desulfurization gypsum (DG), and Portland cement (PC). Currently, SWBC holds great potential as a sustainable building material; however, its low early compressive strength and volume expansion limit its range of application. Therefore, the main objective of this study is to enhance the mechanical properties and dimensional stability of SWBC by adding nano-SiO2, while also improving its resistance to chloride ions, thereby promoting its use in the field of sustainable building materials. A comprehensive experimental approach integrating mechanical performance testing, shrinkage analysis, and chloride diffusion coefficient evaluation was established, with the testing methods of thermogravimetric analysis-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The study found that adding nano-SiO2enhanced the nucleation of calcium silicate hydrates (C-S-H) gel in hydrated SWBC, leading to improved compressive strength and reduced chloride permeability when SiO2addition was 0.5%. When the hydration period extends to 28 days, the modified SWBC achieves a compressive strength of 56 MPa. However, excessive nano-SiO2(≥1%) inhibited the long-term hydration of SWBC but had no significant effect on the final compressive strength.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 9
·1397
·
IF 3.164
Luwei Zhang,Haijuan Kong,Mengmeng Qiao,Xiaoma Ding,Muhuo Yu
Aramid fibers (AFs) with their high Young′s modulus and tenacity are easy to degrade seriously with ultraviolet (UV) radiation that leads to reduction in their performance, causing premature failure and limiting their outdoor end use. Herein, we report a method to synthesize nano-SiO2on AFs surfaces in supercritical carbon dioxide (Sc-CO2) to simultaneously improve their UV resistance, thermal stability, and interfacial shear strength (IFSS). The effects of different pressures (10, 12, 14, 16 MPa) on the growth of nanoparticles were investigated. The untreated and modified fibers were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). It was found that the nano-SiO2-decorated fibers exhibited improvement of thermal stability and mechanical properties, and the IFSS of the nano-SiO2modified fibers increases by up to 64% compared with the untreated fibers. After exposure to 216 h of UV radiation, the AFs-UV shows a less decrease in tensile strength, elongation to break and tensile modulus, retaining only 73%, 91%, and 85% of the pristine AFs, respectively, while those of AFs-SiO2-14MPa-UV retain 91.5%, 98%, and 95.5%. In short, this study presents a green method for growing nano-SiO2on the surface of AFs by Sc-CO2to enhance the thermal stability, IFSS, and UV resistance.Keywords:aramid fiber;nano-SiO2;supercritical CO2;thermal stability;interfacial shear strength;UV resistance
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 8
·3046-3056
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IF 9.8
Hailiang Sheng,Antai Zhu,Lihua Zhang,Jun Huang,Tongjun Yang,Shangdong Qin,Fazhi Zhang,Qinqin Xu,Haibo Xie
Taking advantage of the facile dissolution of chitosan in the green [EMIM][OAc]/GVL-based organic electrolyte solution (OES) and the satisfactory ionic conductivity of the OES, a one-pot strategy for the preparation of a sustainable chitosan/nano-SiO2 nanocomposite organic ionogel electrolyte (CSOIE) was successfully demonstrated through the integration of in situ physical cross-linking via hydrogen bonding using nano-SiO2 and a solution-gel transition induced by moisture after the dissolution of chitosan in the OES. The [EMIM][OAc]/GVL OES not only acted as an efficient solvent for chitosan dissolution, but also ensured high ionic conductivity of the organic ionogel electrolyte and desired electrochemical performance in the assembled flexible supercapacitors over a wide working temperature range. It was found that the storage modulus of the chitosan/nano-SiO2 nanocomposite organic ionogel electrolyte (CSOIE) increased with an increase in the content of nano-SiO2, and the introduction of nano-SiO2 particles into the gel matrix enhanced the mechanical properties and ionic conductivity simultaneously. The as-prepared C8S2OIE sample exhibited high ionic conductivity over a wide temperature range (2.3, 24.3 and 60.3 mS cm−1 at −25, 25 and 80 °C, respectively), and a desirable compressive stress of 1.52 MPa at 25 °C. The assembled flexible supercapacitor using the C8S2OIE sample displayed excellent capacitive performance and temperature-dependent specific capacitance (72.8, 84.6 and 113.2 F g−1 at −25, 25 and 80 °C at 0.1 A g−1, respectively), and long-term stability after 10 000 charge–discharge cycles. It is believed that the satisfactory mechanical properties of the as-prepared CSOIE can be ascribed to both the physically cross-linked chitosan chains via hydrogen bonding and chain entanglement, as well as hydrogen bonding interactions between chitosan chains and nano-SiO2 particles; moreover, the physical interactions were beneficial for the formation of desirable ion channels, thus enabling outstanding electrochemical properties. Consequently, the findings provide significant insights for the design and preparation of sustainable organic ionogel electrolytes using natural polymers, and the outstanding performance of the as-prepared CSOIE suggests significant potential applications in flexible energy storage and conversion devices in the future.
研究领域:
材料科学
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能源存储
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiongfei Du,Yang Li,Kaixuan Sun,Hailiang Liu,Mingxing Chen,Qinglin Huang
Poly (m-phenylene isophthalamide)-based loose nanofiltration membranes were fabricated by electrospinning and subsequential electrostatic layer by-layer self-assembly methods, and the polyelectrolyte multilayers (PEMs) generated by polyacrylic acid (PAA) and polyethyleneimine (PEI) were adopted to contribute the surface functional layer of nanofiber membranes. The incidences of spraying parameter and nano-SiO 2 content on the morphology, chemical constitution and dyes separation performance of PEMs functional layer was investigated, respectively. The results showed that the construction of the PEMs functional layer could obviously enhance the Congo red (CR) filtration efficiency by increasing the rejection from 4.9% to 99.8% and improve the surface hydrophilicity by reducing the water contact angle (WCA) from 90.1° to 51.8°. Nano-SiO 2 is introduced as a filler to regulate the assembly density of PEMs functional layers, the prepared PEMs/PMIA/SiO 2 membrane achieved a relatively stable permeation flux (22.9 L·m −2 ·h −1 ), and maintained high separation efficiency of CR/NaCl solution, revealing the excellent dye desalination performance, which exhibited a potential for the dye/salt wastewater treatment. In particular, we offered a new method to prepare loose nanofiltration (LNF) membranes by electrospinning and electrostatic self-assembly technique with accurate separation of inorganic salts and dye molecules.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2019
·Vol. 40
·期 12
·4588-4596
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IF 2.268
Caixia Chu,Heyi Ge,Kaili Zhang,Nianliang Gu,Shanshan Liu,Chaosheng Jin
The poor interface of carbon fiber (CF) reinforced composites has long been one that researchers want to facilitate. A hierarchical structure of nano-SiO 2 and small-sized graphene oxide (sGO) on CF was constructed by a layer-by-layer method. The electrochemically treated CF was evenly coated with sGO sheets as a medium layer, which made nano-SiO 2 uniformly spread over CF by electrostatic adsorption. The hierarchical structure could provide the synergistic reinforcement on the mechanical properties of CF composite by improving interface adhesion, mechanical interlocking, and chemical bonding. The interlaminar shear strength value of SiO 2 -sGO-CF/epoxy composite reached 71.1 MPa, which was increased by 33.45% compared with the electrochemical etching CF/epoxy composite. The results show that the sizing of sGO and nano-SiO 2 plays a positive synergistic effect by hierarchical reinforcement.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yu Dai,Chenbo Meng,Hang Wu,Longbo Luo,Xiangyang Liu
Electrical insulation materials with excellent thermal resistance and high breakdown strength have great application potential in energy storage devices. Herein, poly(benzimidazole-terephthalamide) (PABI) film with ultra-high breakdown strength was prepared by introducing three-dimensional covalent crosslinked structure, which was constructed by reactive PABI oligomers (PABI-O) and nano-SiO 2 derivate (SiO 2 -Ac). PABI-O was end-capped with acryloyl chloride, and crosslinking reaction of C C groups from acryloyl chloride could take place above 300 °C. Then, SiO 2 -Ac grafted with large amounts of C C groups on its surface was prepared, and it was blended with PABI-O, which was followed by processing into films and annealing at 360 °C. Due to steric structure of SiO 2 -Ac and large amounts of C C groups on its surface, three-dimensional crosslinking can be attained in the composite film by radical addition reaction of SiO 2 -Ac and PABI-O. It is found that the three-dimensional crosslinked structure can increase path tortuosity in the electrical treeing breakdown, which endows the film with breakdown strength up to 624 kV mm −1 and shows 70% enhancement compared with that of Kapton film (a famous polyimide film). Moreover, the film exhibits excellent mechanical properties and dimensional stability. Tensile strength of the film is nearly 340 MPa, and the coefficient of thermal expansion (CTE) is only 5.06 ppm/°C at 20–250 °C.
研究领域:
材料科学
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电气工程
✓ 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）