RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 1
·253-265
·
IF 0.8
Zhou Z.,Qiu L.,Hu G.,Pan Z.,Sun G.,Sun Z.
Using an immersion method, an organic methyltrimethoxysilane (MTMS) coating was prepared on the surface of aluminum alloys at room temperature. A more corrosion-resistant coating has been successfully developed by optimizing hydrolysis conditions, adding surfactant OP-10 and conducting maturation treatment. To characterize the solution, a conductivity meter, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and a particle size analyzer were utilized. As for the analysis of the surface properties of the samples, a series of methods such as X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), contact angle measurements, scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and Tafel polarization analysis were adopted. The results showed that the synergistic effect of OP-10 and maturation treatment can significantly improve the corrosion resistance of the coating.
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
Materials Research Express
·
2022
·Vol. 9
·期 2
·025309
·
IF 2.025
Jingdan Zhang,Yongqing Zhai
To improve the application performance of organic montmorillonite (OMt) and meet the OMt performance requirements of different fields, herein, we developed a synergistic modification method to prepare cationic–nonionic OMt (CN-Mt) using the emulsifier OP-10 and hexadecyltrimethylammonium chloride (CTAC) as comodifiers. The structure, morphology and properties of CN-Mt, cationic-OMt (C-Mt) and nonionic OMt (N-Mt) were studied by XRD, SEM, DSC, and contact angle and swell index measurements. CN-Mt has a larger layer spacing and thinner lamellae, which are obviously different from those of C-Mt and N-Mt. Moreover, CN-Mt was hydrophobic due to its denser organic surface molecules. The interlayer spacing of CN-Mt is positively related to the amount of modifier, and the amount of OP-10 contributes more to the interlayer spacing than CTAC. When the amounts of OP-10 and CTAC are 1.3 and 0.8 times the Mt cation exchange capacity (CEC), the interlayer spacing of the optimal CN-Mt is 4.49 nm, which is significantly higher than that of C-Mt (4.11 nm) at a 2.9 CEC, N-Mt (4.26 nm) at a 1.7 CEC and CN-Mt (4.20 nm) at a 0.9OP-10 + 1.5CTAC CEC. Benefitting from its structural merits, CN-Mt shows a higher degree of lamella separation, peeling and dispersion than C-Mt and N-Mt, as well as good thermal stability. Moreover, the lipophilicity and expansion of CN-Mt in medium- and low-polarity media are better than those of single-component OMt. Therefore, the structure and properties of CN-Mt can be controlled by adjusting the types and amount of modifier, further meeting the performance requirements of various application fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2018
·
IF 0
Bing-Qian Wang,Bo Peng,Jian-Fei Sun,Chu Wang,Ke Jiang,Jing-Hao Ma,Peng-Qi Zhang,Yu-Cai He
An effecti v e combination pretreatment of bamboo shoot shell (BSS) using Emulsifier OP-10 (0.5%, w/v) in the acidified media (pH 4.0) by autoclaving (120 °C, 40 min) was conducted. After BSS slurry without detoxification was enzymatically hydrolyzed for 96 h, glucose (25.2 g/L) and xylose (7.5 g/L) were obtained from 50 g/L BSS at high yields. HPLC results showed that no potential inhibitors (furfural and 5-hydroxymethylfurfural) formed. In the hydrolysates , an effective biocatalytic synthesis of ethyl ( S )-4-chloro-3-hydroxybutanoate (100% yield; >99% e.e. ) from 1000 mM ethyl 4-chloro-3-oxobutanoate was developed without the extra addition of cofactors within 24 h. In summary, this combination strategy involving biomass pretreatment, enzymatic saccharification , and bioreduction can be developed for producing chiral alcohols.
研究领域:
生物质预处理
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酶解糖化
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生物催化
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手性醇合成
✓ 已验证
DOI
Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 7
·1041-1047
·
IF 1.069
Dong Yuhuan,Ma Feng
A type of nanofiber membrane of polyvinyl butyral (PVB)/OP-10/lipase was prepared using electrostatic spinning technology. The results of environmental scanning electron microscopy (ESEM) indicate that the microscopic morphology of PVB/OP-10/lipase membrane spun under 14 kV of voltages,
10 %wt concentration of emulsifier (relative to the amount of PVB) and 10 cm of the distance from the receiver to the needlepoint is uniform. The stability of immobilized and free lipase was studied under different pH, voltages and temperature and storage time. It is showed compared with the
free enzyme, the immobilized enzyme has better temperature-resistant and better storage stability. The immobilized enzyme has recycling activity of 65% after 10 times uses. The esterification rate of lauric acid with lauryl alcohol catalyzed by immobilized lipase can get to 72% after 20 hours
of reaction. While the reaction of lauric acid with lauryl alcohol catalyzed by free lipase cannot occur.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Mao Chen,Leiting Shi,Zhongbin Ye,Shanshan Zhu,Xiao Wang,Xuwei Liang,Zheng Shu,Hong Chen
This paper discussed the selection of functional monomers and optimal synthesis conditions for hyperbranched copolymer named as HVR, a novel polymer flooding chemical, intended to enhance offshore heavy oil recovery. The potential application of HVR as a polymer for oil displacement was also evaluated. Through experiments and molecular simulations, functional monomers AOS and OP-10 for Bohai heavy oil were screened out due to their high viscosity reduction rates for oil, both above 90%. Moreover, the interaction energy calculation results suggested that AOS and OP-10 were more likely to spontaneously disperse asphaltene aggregation. Furthermore, the influence of various factors on the synthesis of HVR was discussed using orthogonal design, and optimal synthesis conditions were determined. The optimal conditions for HVR synthesis are as follows: polymerization concentration of 30 wt %, initiator dosage of 1 wt %, initiation temperature of 50 °C, and system pH of 7; the sum of OP-10 and AOS accounts for 29.9 wt %, with a molar ratio of 1:1; the total amount of AM and AA accounts for 79.9 wt %, with a mole ratio of 6.5:3.5; and 3.0 G PAMAM accounts for 0.2 wt %. Moreover, HVR demonstrated good mobility control capacity and improved the recovery of heavy oil significantly in core flooding tests. Injecting a slug of 0.3 PV of HVR led to the additional recovery of 21.96 and 16.04% for oil viscosities of 350 and 500 cP, respectively. Notably, HVR’s additional recovery was over 7% higher than that of conventional hydrophobically associating polymer. These findings highlight the potential of HVR as a novel polymer to enhance the heavy oil recovery.
研究领域:
石油工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2020
·
IF 1.349
Dawei Chen,Lijun Chen
The long carbon chain monomer modified polyacrylate latex was successfully prepared by semi-continuous seeded emulsion polymerization. In this work, methyl methacrylate and butyl acrylate were used as main monomers; stearyl acrylate was used as functional monomer, which were emulsified with the novel mixed surfactants of disodium laureth sulfosuccinate (AEMES) and alkylphenol ethoxylates (OP-10) and initiated with 2,2′-azobis (2-methyl propion- amidine) dihydrochloride initiator. The structure of the resultant latex was characterized by Fourier transform infrared spectroscopy. The differential scanning calorimetry, thermogravimetric analysis and contact angle were used to test the properties of the latex film. The particle size of the latex was measured by the Zetatrac dynamic light scattering detector. Factors, which have an influence on the properties of the latex and its film, have been investigated in detail. Results show that the optimal condition of synthesizing the latex is as follows: the amount of emulsifiers is 4%; the mass ratio of AEMES to OP-10 is 3:1; the amount of initiator is 0.7%; the content of SA is 6%.
研究领域:
高分子科学
·
材料工程
·
化学合成
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xu Li,Chunsheng Pu,Yun Bai,Feifei Huang
Multiwalled Carbon nanotube (MWCNT) serves as one of emerging and attractive materials for stabilizing foams due to its small size, special surface property and rod-like structure. The combination of MWCNT and surfactant has been regarded as an effective strategy to improve foam stability in porous media . However, the effects of surfactant types on the dispersity of MWCNT and on the stability of MWCNT stabilized foams have yet to be clearly understood. More importantly, the lack of comprehensive study of the synergistic interactions between surfactants and MWCNTs seriously limits the understanding of MWCNT’s foam-stabilizing mechanism, restricting its application as the foam stabilizer . Herein, this paper aims to systematically study the foam-stabilizing performance and mechanism of different surfactant/MWCNT foam systems. Combining with the experimental results obtained from ultraviolet and visible spectrophotometry and zeta potential tests, environmental scanning electron microscope analyses, contact angle measurements, optical microscope observations, and surface tension and dilational viscoelastic modulus determinations, the foam-stabilizing mechanism of different surfactant/MWCNT foam systems can be conjectured as follows. Compared with anionic and nonionic surfactants (SDS and OP-10) modified MWCNT, the MWCNT modified by the cationic surfactant (CTAB) can yield better dispersity due to the larger electrostatic repulsion and higher steric resistance between MWCNTs after the adsorption of CTAB . The highly dispersed MWCNTs have small sizes, which make them enter the foam film easily and tend to aggregate at Plateau border. These aggregations can significantly slow down the film drainage. In addition, MWCNTs can improve the viscosity of foam film, which helps to increase the resistance of gas diffusion and mitigate bubble coalescence . After being adsorbed by surfactants, the modified MWCNT can adsorb on the air-water interface. Due to the higher detachment energy, the CTAB modified MWCNT has a stronger adsorption capacity at the air-water interface compared with SDS and OP-10 modified ones. This tight adsorption can improve the dilational viscoelastic modulus and thus enhance foam stability. Finally, the dual-sand pack experiments proved that the CTAB/MWCNT stabilized foams have good potential for conformance control in heterogenous reservoirs.
研究领域:
材料科学
·
化学工程
·
胶体与表面化学
·
石油工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）