ENERGY & FUELS
·
2024
·
IF 5.2
Xuening WANG,Long HE,Peng XUE,Yachao FENG,Yan HUANG,Xuefeng WANG
In recent years, low-salinity waterflooding and nanofluid flooding have been regarded as the new technologies for enhanced oil recovery and research (EOR). Research on the mechanisms behind the improvement in the recovery rate has garnered significant attention. However, little attention has been given to the mechanism of low-salinity water within the high-salinity range and the synergistic mechanism between low-salinity water and nanoparticles. In the salinity range of 0–22,0,000 mg/L, the interfacial properties of different concentrations of Na+, Mg2+, Ca2+, and SO42– were investigated. The following conclusions were drawn: interfacial tension (IFT) gradually decreased at elevated temperatures, reaching a minimum value of 14.9 mN/m for 2000 mg/L low-salinity water at 60 °C. The contact angle decreased significantly at increased temperatures, reaching a minimum value of 64.8° for the contact angle of 2000 mg/L low-salinity water at 60 °C, indicating water-wet wettability. Electrostatic repulsion was the highest for 5000 mg/L low-salinity water, with a zeta potential value of −12.56 mV. Furthermore, Na+ significantly affected IFT and zeta potential values at low concentrations, while Ca2+ exhibited a more significant effect on wettability at low concentrations. Additionally, when utilizing 2000 mg/L low-salinity water as the dispersion medium for ZrO2 nanoparticles, increasing the particle concentration negatively impacted the stability of the nanofluid. As the temperature increased, IFT decreased, reaching a minimum value of 14.27 mN/m at a concentration of 0.01 wt % at 60 °C. Similarly, as the temperature increased, the contact angle decreased, with nanofluids at a concentration of 0.014 wt %, exhibiting the lowest contact angle of 51° at 60 °C, indicating increased water-wet wettability of the rock surface. This study offered a fundamental understanding of interfacial phenomena involving low-salinity water and nanoparticles, indicating their potential for EOR technology.
研究领域:
石油工程
·
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2012
·
IF 2.367
Jing-Yun Wang,Cui-Li Ma,Yong-Ming Bao,Pin-San Xu
Lipase from Burkholderia cepacia was encapsulated inside zirconia particles by biomimetic mineralization of K 2 ZrF 6 induced with protamine, a natural cationic protein. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) were employed for the characterization of the novel immobilized lipase. SEM and TEM images showed that both the zirconia particles with and without lipase have good spherical structures with average particle sizes of 150 nm. Fluorescence microscopy demonstrated that the lipase was indeed encapsulated inside the zirconia particles. The maximum immobilization capacity of the zirconia particles was 0.15 units/mg under optimum immobilization conditions. Biochemical characterization showed that the encapsulated lipase could retain most of its initial activity. Compared with free lipase, the encapsulated lipase exhibited improved thermal, pH, and recycling stabilities. After 8 weeks of storage, no substantial loss in catalytic activity was observed for the encapsulated lipase. The conversion of the kinetic resolution of ( R,S )-1-phenylethanol with vinyl acetate as acetyl donor catalyzed by zirconia-immobilized lipase reached 49.9% with higher ee s of 99.9% under the following optimal conditions: octane as solvent, 0.1 M ( R,S )-1-phenylethanol, 70 mg immobilized lipase, 180 rpm, 50 °C for 48 h. After 6 cycles (288 h), the conversion and ee s were still 43% and 85%, respectively.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2018
·
IF 4.92
Jie Ding,Tao Yang,Zhixiong Huang,Yan Qin,Yanbing Wang
ZrSi 2 modified carbon–phenolic (C-Ph) composites are prepared using different weight loadings of zirconium silicide particle by compression moulding . The thermal stability and ablation resistance of composites are investigated by thermal gravimetric analysis (TGA) and oxyacetylene torch test. Moreover, the phase composition and microstructure of ablated surface are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED). The results show that introduced ZrSi 2 particles result in an evident increase in the residual weights of C–Ph composites at high temperatures, and the enhancement in thermal stability under air atmosphere exhibits positive effects on improving the ablation resistance of C-Ph composites. The optimum ZrSi 2 weight loading for the improvement of ablation resistance in C-Ph composites is 5wt%. The linear and mass ablation rates of composites after modifying with 5wt% ZrSi 2 particles are reduced by 80.5% and 55.2%, respectively. This work provides an effective way to prominently improve the ablation performance of C–Ph composites, and it maybe become a backbone of thermal protection system in aerospace.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8169-8176
·
IF 1.798
Jiang Yancheng,Xu Yunhua,Feng Guitao,Yao Hanchao
Ni–Co/ZrO 2 nanocomposite coatings were produced by high-frequency pulse electrodeposition in a modified Watt’s bath containing ZrO 2 particles. The surface morphology, microstructure, and high temperature oxidation resistance of the coatings were characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction, and isothermal oxidation tests. It was found that the presence of ZrO 2 particles resulted in changes in the morphology and structure of the coatings. The results also confirmed the nanostructure and uniform distribution of ZrO 2 particles of Ni–Co/ZrO 2 nanocomposite coatings. The addition of ZrO 2 did not change the preferred orientation (200), but remarkably affected the relative intensity of planes of Ni–Co alloy. The influence of duty cycle, average current density, and frequency on the amount of incorporated ZrO 2 particles in the Ni–Co/ZrO 2 nanocomposite has been also investigated. The Ni–Co/ZrO 2 nanocomposite coatings with highest ZrO 2 content (11.6 wt%) were prepared under the condition of duty cycle of 40 %, average current density of 5 A dm −2 , and frequency of 100 kHz. Moreover, the embedded ZrO 2 particles significantly improved the high temperature oxidation resistance of Ni–Co alloy coatings. The oxidation rate of Ni–Co/ZrO 2 nanocomposite coatings decreased with increasing the ZrO 2 content of the coatings.
研究领域:
材料科学
·
表面工程
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 6
·804-810
·
IF 2.247
Jiming Yang,Ning Zhang,Haolong Li,Bin Xu,Wenjing Tian,Dewen Dong
A facile and efficient strategy for the preparation of polymer grafts on zirconia particles is developed by means of self-initiated photografting and photopolymerization. The UV-induced grafting polymerization is applicable to a variety of polymerizable monomers, allowing the direct formation of homogeneous and stable polymer coatings on zirconia particles without any initiator immobilization. The as-prepared polymer grafts are proved to be efficient supports for polyoxometalates as H 3 PW 12 O 40 can be uniformly and stably immobilized on a poly(4-vinylpyridine) layer through electrostatic interaction. The resulting hybrid catalyst system, associated with high catalytic activity for a series of oxidation reactions such as amines, alkenes, alcohols and sulfides, represents a novel and efficient system with a high catalyst loading capacity and stability upon reuse in further cycles. © 2014 Society of Chemical Industry
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2025
·Vol. 13
·期 9
·3023-3031
·
IF 5.7
Jiaqi Wu,Yichi Zhang,Yue Liu,Yuanyuan Zheng,Kailiang Xu,Peining Chen,Huisheng Peng
Acoustic matching layers play an important role in ultrasonic transducers. However, the acoustic matching layer with both intrinsic flexibility and high acoustic impedance remains an unmet need to achieve high-performing flexible ultrasonic transducers. Herein, we present an epoxy/nano-zirconia composite with excellent flexibility and acoustic performance by the chemical coupling method. (3-Aminopropyl)triethoxysilane was used to effectively disperse nano-zirconia particles in epoxy resin, and endow the resultant composite with flexibility. After carefully adjusting the additions of nano-zirconia particles and (3-aminopropyl)triethoxysilane, the modulus of the epoxy/nano-zirconia composite was 4.5 MPa, combined with an elongation at break over 90%. The acoustic impedance of the epoxy/nano-zirconia composite (∼4.5 MRayl) exceeded that of other typical polymer counterparts. The flexible acoustic matching layer based on an epoxy/nano-zirconia composite could significantly improve the sensitivity and bandwidth of ultrasonic transducers. A fiber-shaped ultrasonic transducer with high sensitivity and wide bandwidth was fabricated, displaying promising application potential in wearable medical electronics.
研究领域:
材料科学
·
声学
·
纳米技术
·
生物医学工程
·
高分子科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）