INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Gaopan Dong,Zhengqiu Yuan,Xiujuan Guo
Petroleum-based plastics are widely used because of their practicable properties and low cost. However, people are equally concerned about the environmental damage generated by non-biodegradable petrochemical plastics. In this study, pinewood was employed as the raw material to prepare cellulose acetate and further synthesize the degradable composite films, which showed potential feasibilities to substitute the traditional petroleum-based plastics. In order to improve the barrier performance, hydrophobic performance, and mechanical properties of the film materials , nano-SiO 2 was introduced as functional filler for experimental exploration. The tensile strength, light transmittance, water vapor transmittance, microstructure, and crystalline structure of the nano-SiO 2 /pinewood-derived cellulose acetate composite films were determined by mechanical analysis, optical analysis, SEM, XRD , FT-IR, and barrier characterization methods, respectively. The results exhibited that the prepared films with the inclusion of nano-SiO 2 did not conduct reduction in transparency due to its good dispersion in the composite film. The barrier property, hydrophobic performance, and mechanical properties of cellulose acetate composite film were effectively improved due to the interaction between nano-SiO 2 and cellulose acetate molecular chains by the hydrogen bonds formed between hydroxyl groups. It was confirmed that the nano-SiO 2 /pinewood-derived cellulose acetate composite films exhibit great application potential as an environmentally friendly and efficient material for packaging.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2014
·
IF 3.583
Chenghui Li,Xue Jiang,Xiandeng Hou
Nano-SiO 2 was immobilized on the inner wall of a dielectric barrier discharge (DBD) tube, and it was coupled to a conventional gas chromatographer to investigate its performance as a molecular emission spectrometric detector for the determination of five volatile aliphatic amines. A charge-coupled device (CCD) was applied to observe the nano-SiO 2 -enhanced molecular emission spectra. The characteristic molecular emission bands of volatile aliphatic amines at 326.5 nm, 336.0 nm and 388.3 nm can be clearly resolved from the background emission spectra of carrier gas argon. The emission band of CN at 388.3 nm was used for quantitative detection of volatile aliphatic amines due to its high sensitivity. Nanomaterial catalysts including TiO 2 , MnO 2 , SiO 2 and ZnO were tested to enhance the emission signal of amines, and SiO 2 shows the best performance. The factors that influence the emission signal, such as discharge voltage, inner electrode length and carrier gas flow rate , were investigated in detail. The analytical performance of this method was evaluated by separation and detection of the mixture of five volatile aliphatic amines. Under the optimal experimental conditions, the limits of detection were found to be 4.4, 2.5, 2.2, 1.8 and 2.4 μg for dimethylamine , trimethylamine , n-butylamine, cyclohexylamine and ethylenediamine , respectively. This GC detector is not only sensitive but also fast in response to volatile aliphatic amines with good stability. Trimethylamine in a carp fish sample was monitored with storage time by the proposed method.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xuechen Tang,Bobo Zhou,Chao Chen,Bauyrzhan Sarsenbekuly,Hongbin Yang,Wanli Kang
Due to the superior performance caused by surface modification and combined effects, polymer/nano-SiO 2 composites have been studied systematically for a long term and attracted increasing academic and industrial interests, especially in the petroleum engineering field. However, few works have been done on the mechanism that how the functional modification degree ( MD ) of nano-SiO 2 influences on the properties of the composites. In this work, a series of 3-(methacrylyloxy)propyltrimethoxysilane (MPS) modified nano-SiO 2 particles with different MD s were prepared and found to differ largely from each other in macroscopic properties . Then the effects of SiO 2 MD on the physicochemical property and the enhanced oil recovery (EOR) capacity of the corresponding polymer/nano-SiO 2 composite microspheres (PNSCMs) for the conformance control in oilfields were investigated in detail. The results clarified that by regulating the MD of nano-SiO 2 encapsulated in PNSCMs, the swelling property, viscoelasticity , mechanical strength and dispersion stability were significantly improved. Compared with traditional chemical copolymer microspheres CPMs, PNSCMs exhibited better conformance control and EOR ability, which was further improved as SiO 2 MD increased. The maximum oil recoveries of cores treated by PNSCMs were 76.14% and 52.45% in the experiment, and the EOR increased by 5.99% and 4.99% than those treated by CPMs, respectively, under homogeneous and heterogeneous conditions.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 34
·27097-27106
·
IF 3.84
Guiying Wu,Xin He,Li Xu,Houjin Zhang,Yunjun Yan
Novel Sapium sebiferum oil-based polyurethane (PU) nanocomposites with different contents of nano-SiO2 were successfully synthesized via an in situ polymerization method. Firstly, Sapium sebiferum polyol (SSP) was prepared in a continuous two-step process of epoxidation and hydroxylation, and nano-SiO2 particles were modified with 3-aminopropyltriethoxysilane (AMEO). Furthermore, SSP and isophorone diisocyanate (IPDI) reacted with a certain amount of the modified nano-SiO2 to enhance the physical properties of PU nanocomposites. The characterization of the structure and the properties of the surface modified nano-SiO2 and the PU/SiO2 nanocomposites were analyzed by Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), solid-state 29Si nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results demonstrate that nano-SiO2 particles can be homogeneously dispersed in the PU matrix with a loading amount less than 5 wt%. Compared with the pure PU, the glass transition temperatures and initial decomposition temperatures of the PU/SiO2 nanocomposites were respectively enhanced by 20.5 °C and 43.5 °C with 3 wt% nano-SiO2 content. Moreover, the tensile strength of the PU/SiO2 nanocomposites was improved at 170%, and the water and toluene resistance properties of PU/SiO2 were also significantly enhanced.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 15
·期 1
·186
·
IF 4.967
Qun Yang,Run Zhang,Mingfei Liu,Ping Xue,Lichao Liu
Ultra-high molecular weight polyethylene (UHMWPE)/high-density polyethylene (HDPE) blend with lower viscosity is more suitable for melt spinning compared to pure UHMWPE; however, the mechanical property of the blend fiber is hard to dramatically improve (the maximum tensile strength of 998.27 MPa). Herein, different content modified-nano-SiO2is incorporated to UHMWPE/HDPE blend fiber. After adding 0.5 wt% nano-SiO2, the tensile strength and initial modulus of UHMWPE/HDPE/nano-SiO2fiber are increased to 1211 MPa and 12.81 GPa, respectively, 21.57% and 43.32% higher than that of UHMWPE/HDPE fiber. Meanwhile, the influence of the nano-SiO2content on the performance for as-spun filament and fiber are emphatically analyzed. The crystallinity and molecular chain orientation of as-spun filament reduces with the addition of nano-SiO2. On the contrary, for fiber, the addition of nano-SiO2promoted the crystallinity, molecular chain orientation and grain refinement more obvious at a lower content. Furthermore, the possible action mechanism of nano-SiO2in the as-spun filament extrusion and fiber hot drawing stage is explained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Kailun Xia,Yue Gu,Linhua Jiang,Kai Lyu,Mingzhi Guo,Weizhun Jin
In surface treatment technics of cement-based materials, nanoSiO 2 (NS) is effective in refining pore structure while organic water-repelling agents are often used for producing a hydrophobic surface. Due to its advantages of pore refining effect and hydrophobicity, the organic-inorganic hybrid nanoSiO 2 has attracted increasing attention. However, the UV-irradiation can result in photodegradation of organic constituents, leading to deterioration of hydrophobicity. In this study, a novel UV-resistant fluorinated hybrid nanocomposite, NS@TOFS, was synthesized and used for surface treatment on hardened cement-based materials. The water and gas permeability of the treated samples before and after UV-aging were assessed by measuring the water absorption rate, water contact angle and carbonation degree. The experimental results showed that the NS@TOFS treated samples possess enhanced water and gas impermeability after 14 days of exposure to UV rays. A morphological observation of the treated surface revealed that a synergistic effect of organic film and refined pore structure was responsible for the improved surface properties. Findings from this study well demonstrate that the developed fluorinated hybrid nanoSiO 2 holds great promise for enhancing the durability of cement-based materials under UV-irradiations.
研究领域:
建筑材料学
·
表面处理技术
·
纳米材料科学
✓ 已验证
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
·
石油工程
·
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
·
材料科学
·
环境工程
✓ 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
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
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
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Geoenergy Science and Engineering
·
2023
·
IF 0
Nanjun Lai,Wei Fan,Xiaochen Zhang,Liang Liu,Xuefeng Zhou,Siqi Chen
Shale instability caused by the development of nano-micron-scale fractures, pores, and bedding is always a challenge for drilling complex formations. In this work, two additives (Temperature-sensitive polymer based nano-SiO 2 composite (SNAS) and poly (NVP-TAAC-AMPS) (NTA)) were synthesized. The lower critical solution temperature (LCST) value of SNAS could be controlled by adjusting the monomer ratio. As temperature-sensitive nanocomposites , SNAS has the rheological control of drilling fluid. The effects of SNAS and NTA on shale stability were tested based on analytical approaches, including shale wettability , microporous membrane fluid loss, pressure transmission rate, shale specific surface area, shale pore volume, shale strength, linear swelling percentage and shale cuttings recovery. When the temperature is higher than the LCST value, due to the transition from hydrophilicity to hydrophobicity of SNAS, it not only changes the wetting angle of shale, but also enhances the plugging effect of SNAS. The composite system could form tight plugging layer and hydrophobic region compared with single SNAS, which was more conducive to improve plugging performance of shale. Finally, the synergistic improvement mechanism of shale stability combined with SNAS and NTA were further proposed.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
FIRE TECHNOLOGY
·
2024
·
IF 2.3
Zhang Jiaqing,Shang Fengju,Liu Xin,Li Kaiyuan,Yang Yunpeng,Zou Yanyan
Nano SiO 2 particles (NPs) combined with organosilane surfactants present a promising avenue for the development of stable fluorine-free firefighting foams. In this study, hydrophilic nano SiO 2 particles, non-ionic organosilane surfactant (SiCare2238), and amphoteric hydrocarbon surfactant (LAMC) were prepared as a mixed dispersion to investigate the interactions between nano particles and surfactants, foaming ability, and foam stability of the mixed dispersion. Results indicated that the surface activity, electrical conductivity, and foaming ability of the mixed dispersion decreased with increasing NPs concentration. The impact of NPs on foam stability depended on the filling and blocking mechanisms within the platform boundary of the formed liquid film. At NPs concentrations below 1.5%, strong electrostatic interactions among surfactant molecules resulted in the adsorption of surfactant molecules on the nano particle surface, preventing the formation of a network structure at the platform boundary, thereby reducing foam stability. At NPs concentrations above 1.5%, a significant number of NPs formed a network structure, filling and blocking the platform boundary, leading to delayed foam drainage, coarsening, and enhanced foam stability. This study provides theoretical guidance for the application of nano particles in fluorine-free.
研究领域:
材料科学
·
化学工程
·
消防技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）