JOURNAL OF SURFACTANTS AND DETERGENTS
·
2022
·Vol. 25
·期 4
·527-536
·
IF 1.972
Jun Chen,Zhiyu Huang,Dongfang Liu,Ying Zhang,Hanmin Li,Hongsheng Lu
In the process of the tertiary recovery of oil and gas resources, it is necessary to use external fluids to displace the crude oil in the reservoir. Whether the crude oil on the surface of the rock can be effectively displaced and the wettability of the rock can be changed to avoid re-adsorption by the crude oil is directly related to the level of oil recovery. Therefore, it is critical to study the cleaning and wettability reversal of reservoir rock surface. Because microemulsions have outstanding performance in changing the wettability of rocks and solubilizing crude oil, this paper uses cetyl trimethyl ammonium bromide (CTAB) as a surfactant and n -butanol as a co-surfactant to prepare microemulsions. The performance of microemulsions with different microstructures on the cleaning and wettability changes of crude oil on the rock surface were studied. The results show that the water-in-oil (W/O) microemulsion has good cleaning efficiency, and the oil removal rate on the sandstone core surface can reach 79.65%. In terms of changing the wettability of the rock surface, W/O, bi-continuous phase (B.C.) and oil-in-water (O/W) microemulsions can change the core surface from lipophilic to hydrophilic. And the effects of the B.C. and O/W microemulsions are more obvious. The microemulsion system that was prepared based on cationic surfactants has a good application prospect in changing the wettability of the reservoir and cleaning the adsorbed crude oil.
研究领域:
石油工程
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化学工程
·
表面活性剂科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yun Guo,Hong-Yi Li,Jie Cheng,Shuo Shen,Jiang Diao,Bing Xie
The V-Cr-bearing reducing slag (VCBRS) is solid waste, which cannot be treated at present. This work proposes an effective approach to separately recover its major elements of V, Cr and Si and fully utilize the VCBRS with added-values. Flocculation desiliconization is used to extract Si from the acid solving liquid of VCBRS and Si is recovered as white carbon black with purity of 94.60% and recovery of 93.04%. After desiliconization, V in the solving liquid is selectively oxidized by H 2 O 2 and extracted by microemulsion extraction, which is recovered as V 2 O 5 whose purity is 99.60% with recovery at 96.32% from the stripping liquor of loaded microemulsion . Cr in the raffinate is recovered by alkaline precipitation as final product of Cr 2 O 3 with purity of 98.83% and recovery of 92.68%. The principles are discussed in detail and the operation conditions are optimized systematically. The microemulsion and wastewater are both cyclically utilized, which eliminates the secondary wastes. This work efficiently recovers all valuable elements with increased values from the solid waste, which can not only solve the environmental pollution problem, but also realize the efficient recovery of valuable elements to achieve comprehensive utilization.
研究领域:
冶金工程
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环境科学
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 6
·974-980
·
IF 2.232
Guo Yun,Li Hong-yi,Yuan Yi-heng,Huang Jie,Diao Jiang,Li Gang,Xie Bing
The fusion of the leaching and purification processes was realized by directly using microemulsion as the leaching agent. The bis-(2-ethyhexyl) phosphoric acid (DEHPA)/ n -heptane/NaOH microemulsion system was established to directly leach vanadates from sodium-roasted vanadium slag. The effect of the leaching agent on the leaching efficiency was investigated, in addition to the molar ratio of H 2 O/NaDEHP ( W ), DEHPA concentration, solid/liquid ratio, stirring time, and leaching temperature. In optimal situations, the vanadium leaching efficiency reaches 79.57%. The X-ray diffraction characterization of the leaching residue and the Raman spectrum of the microemulsion before and after leaching demonstrate the successful entry of vanadates from the sodium-roasted vanadium slag into the microemulsion. The proposed method successfully realizes the leaching and purification of vanadates in one step, thereby greatly reducing production costs and environmental pollution. It also offers a new way to achieve the green recovery of valuable metals from solid resources.
研究领域:
冶金学
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环境科学
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产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 35
·8086-8094
·
IF 3.679
Xiaonan Li,Xirong Huang
A Good's buffer ionic liquid (GB-IL) composed of quaternary ammonium cations and Good's buffer anions is first introduced into a microemulsion system as a self-buffering and biocompatible electrolyte. The effects of the constituting ions of a GB-IL and their concentrations on the phase behavior of the anionic surfactant SDBS stabilized n-octane–H2O microemulsion system were studied for the first time using the ε–β fish-like phase diagram method. The result indicates that the phase behavior of the above microemulsion system is greatly affected by GB-IL cations with a longer alkyl chain on the cation being more favorable for phase inversion. Compared with NaCl, a GB-IL of the same concentration is more efficient for achieving phase inversion, due to the dual role of an electrolyte and a co-alcohol. In addition to the phase behavior, the stability of horseradish peroxidase (HRP) solubilized in an SDBS stabilized bicontinuous microemulsion is also affected by a GB-IL. It is found that the variation of the cationic alkyl chain has a negligible effect on the microemulsion microstructure, but has a significant influence on the stability of the solubilized HRP. At a fixed concentration of the GB-IL, the quaternary ammonium cation with a longer alkyl chain is better for the stabilization of the HRP activity. For a given GB-IL, a higher level of the GB-IL results in a better HRP stability. More importantly, the GB-IL-buffered microemulsion, at the same level of the buffering salt, is more advantageous than the phosphate-buffered one for the stabilization of the HRP activity. This advantage is more pronounced for higher concentrations of the GB-IL. This difference in the HRP stability, caused by the buffering salts, should be ascribed to the microemulsion microstructure effect as well as the Hofmeister effect. The present study provides a guideline for the construction of a bicontinuous microemulsion with a simplified composition and stabilizing effect on the solubilized enzyme.
研究领域:
胶体科学
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化学工程
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生物技术
·
酶工程
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产品关联
DOI
PubMed
高影响因子
PHARMACEUTICAL DEVELOPMENT AND TECHNOLOGY
·
2021
·
IF 3.133
Kang Sha,Qianfang Ma,Hanitrarimalala Veroniaina,Xiaole Qi,Jiayi Qin,Zhenghong Wu
Solidification of self-microemulsifying drug delivery systems (SMEDDS) is one of the major trends to promote the transformation of self-microemulsion technology into industrialization. Here, a preliminary curcumin SMEDDS formulation was constructed to improve the druggability of curcumin, through the determination of equilibrium solubility determination, self-emulsifying grading assessment, and pseudo-ternary phase diagrams drafting. Furthermore, the optimal curcumin SMEDDS formulation consisted of 10% Ethyl oleate, 57.82% Cremophor RH 40, and 32.18% Transcutol P was obtained by the simplex lattice design. Besides, curcumin solid self-microemulsifying drug delivery system (S-SMEDDS) was developed by the extrusion and spheronization process to achieve the solidification of SMEDDS. The formulation of curcumin S-SMEDDS pellets was screened by the single factor experiment and the process parameters were investigated using the orthogonal optimization method. Subsequently, curcumin S-SMEDDS pellets were evaluated by apparent morphology characterization, redispersibility study, drug release behavior, and pharmacokinetic evaluation. Results from the pharmacokinetic study in rabbits showed that the AUC0–τ of the curcumin S-SMEDDS pellets and curcumin suspension were 5.91 ± 0.28 µg/mL·h and 2.05 ± 0.04 µg/mL·h, while the relative bioavailability was 289.30%. These studies demonstrated that S-SMEDDS pellets can be a promising strategy for curcumin industrialized outputs.
研究领域:
药学
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药物递送系统
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药代动力学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2018
·Vol. 315
·期 3
·581-593
·
IF 1.181
Jie Fengping,Bai Zhishan,Yang Xiaoyong
A microemulsion consisting of sodium laurate, n -pentanol, n -heptane and NaCl solution was investigated for Co(II) extraction. The dilution method and conductivity method were used for the determination of structural parameters of sodium laurate/pentan-1-ol/heptane/NaCl microemulsion system. Co(II) was found to be extracted into the microemulsion phase due to the compound formation of [CoCl] + [R 11 COO] − , which was confirmed by the continuous variation of R 11 COONa concentration. Moreover, the effects of cosurfactant, the contact time, the phase ratios, PH and the NaCl concentration in feed solutions on the cobalt extraction yield were investigated. Under the optimum conditions, the extraction percentage of Co(II) could reach 98.9%.
研究领域:
化学
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环境科学
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DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 4
·964
·
IF 3.426
Jianfeng Zhang,Shuxin Gong,Jiahang Zhu,Jiejing Zhang,Jing Liang
A cost-effective, simple, and time-saving method to fabricate mono-dispersed periodic microsphere structures on substrates with patterned sites is very meaningful due to their significance on various biological studies. Herein, a simple and facile method to fabricate mono-dispersed microsphere arrays on porous substrates was developed. The mixture of polystyrene and an organic stabilizer solution which contains aqueous solution, fabricated through shaking, was applied to prepare microemulsion solution. An ordered porous structure was produced by spreading and evaporating the solvent of microemulsion on a glass slide, accompanied by the enrichment of didodecylamine in the cavities. The porous cavities were further modified with polyacrylic acid and poly(diallyldimethylammonium chloride) which could immobilize the microspheres. The charged microspheres were incorporated into the cavities by an electrostatic interaction with the oppositely charged polyelectrolytes. The positive polyelectrolytes with abundant charges as well as a suitable content and dimension of microspheres, ensured the formation of mono-dispersed and ordered arrays. Considering that other charged particles were universally suitable for the present strategy, the reported approach opened an efficient way for the preparation of microsphere-based materials.Keywords:microemulsion;porous structures;mono-dispersed microsphere array
研究领域:
材料科学
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生物技术
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
Marine Drugs
·
2020
·Vol. 18
·期 10
·492
·
IF 4.073
Jiawen Zhao,Kening Jiang,Yixuan Chen,Juan Chen,Yangfan Zheng,Huilin Yu,Jiajin Zhu
Antarctic krill oil is high in nutritional value and has biological functions like anti-inflammation and hypolipidemic effects. But it has and unpleasant smell, and unsaturated fatty acids are prone to oxidative deterioration. Its high viscosity and low solubility in water make it difficult for processing. Microemulsion can be a new promising route for development of krill oil product. We determined a formula of krill oil-in-water microemulsion with krill oil: isopropyl myristate = 1:3 as oil phase, Tween 80:Span 80 = 8:2 as surfactant, ethanol as co-surfactant and the mass ratio of surfactant to co-surfactant of 3:1. After screening the formula, we researched several characteristics of the prepared oil-in-water microemulsion, including electrical conductivity, microstructure by transmission electron microscope and cryogenic transmission electron microscope, droplet size analysis, rheological properties, thermal behavior by differential scanning calorimeter and stability against pH, salinity, and storage time.Keywords:microemulsion;Antarctic krill oil;formula selection;characterization
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2018
·
IF 3.997
Yawen Li,Angelina Angelova,Jianwen Liu,Vasil M. Garamus,Na Li,Markus Drechsler,Yabin Gong,Aihua Zou
In this work, we used the small angle X-ray scattering (SAXS) method for controlled preparation of in situ forming sustained-release carriers for the antitumor drug bufalin (BUF), which has very poor solubility and a considerable cardiotoxicity in a non-encapsulated state. To that aim, we exploited the pseudo-ternary phase diagram of an oil(O)/surfactant(S)/water(W) system containing medium chain capric/caprylic triglycerides (MCT) and a co-surfactant blend of Macrogol (15)-hydroxystearate (Solutol HS 15) and sorbitan monooleate (Span 80). Two compositions with different oil contents (sample B and C) were selected from the microemulsion region of the phase diagram in order to study the effect of the aqueous environment on their structural behavior. A phase transition from a microemulsion (ME) to a liquid crystalline phase (LC) was established by SAXS upon progressive dilution. The drug bufalin (BUF) was encapsulated in the microemulsions with low viscosity, whereas the release of the drug occurred from the in situ generated lamellar liquid crystalline structures. The formulations were characterized by SAXS, dynamic light scattering (DLS), cryogenic transmission electron microscopy (Cryo-TEM), rheology, drug loading and encapsulation efficiency, and in vitro release profiles. A correlation was suggested between the structures of the in situ phase-transition formed LC ME formulations, the differences in their viscosities and drug release profiles. The performed cytotoxicity, cell apoptosis and pharmacokinetic experiments showed an enhanced bioavailability of BUF after encapsulation. These results suggest potential clinical applications for the obtained safe in situ phase-transition sustained-release formulations of BUF.
研究领域:
药剂学
·
肿瘤学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Bioresource Technology Reports
·
2020
·
IF 0
Jing Gao,Cuili Chen,Yanping Lin,Lili Zhang,Hongwu Ji,Shucheng Liu
In this study, four deep eutectic solvents (DESs) were used as cheaper and “greener” alternatives to ionic liquids (ILs) to create novel microemulsions . Compared with 1-ethyl-3-methyl imidazolium acetate ([Emim]Ac), the DESs of lactic acid:glucose:water and lactic acid:fructose:water (molar ratio = 5:1:3) comprising acid hydrogen-bond donor (p K a = 3.86) showed stronger capability to form the microemulsions with Tween 20 , methanol and cyclohexane . After the pretreatment of rice straw at 70 °C for 12 h by using the microemulsions (mass ratio of DES, Tween 20/methanol, cyclohexane = 0.1:0.8:0.1), 54.3% of lignin was removed, and the crystalline structure was significantly disrupted. When the content of DES (lactic acid:glucose:water) increased to 50%, the sugar yield of the residues was increased to 88.1%, which was 3 times than that of untreated one. Moreover, the enzymatic hydrolysis of the residues is linearly and positively correlated with the delignification abilities of the DES microemulsion.
研究领域:
生物化学
·
农业科学
·
环境科学
✓ 已验证
DOI
Soft Matter
·
2015
·Vol. 11
·期 14
·2885-2892
·
IF 4.029
Dashuang Fan,Peizhu Zheng,Yuanming Ma,Tianxiang Yin,Jihua Zhao,Weiguo Shen
The concentration-dependent enthalpies of mixing for water/sodium bis(2-ethylhexyl)-sulfosuccinate (AOT)/n-alkane microemulsions with different water contents ω0 and chain lengths n of n-alkane were determined by isothermal titration microcalorimetry (ITC) and flow-mixing microcalorimetry at 298.15 K and used to calculate the interaction enthalpies (−ΔHC) between the droplets. It was found that −ΔHC increased with ω0, and changed from negative to positive at about ω0 = 10. The investigation of the dependence of −ΔHC on n revealed that the values of −ΔHC were negative and had a minimum for ω0 = 5; while they were positive and had a maximum for ω0 = 15. These phenomena were discussed based on the competition of the overlapping contribution of the surfactant tails between two neighbouring droplets and the penetration contribution of the solvent molecules into the surfactant tails. These results indicated the important role of entropy in the stability of the microemulsion systems.
研究领域:
化学
·
物理化学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2016
·
IF 3.449
Longyun Hao,Rui Wang,Kuanjun Fang,Yuqing Cai
The cotton samples were treated by chitosan solution at acidic condition to modify their dyeing properties to anionic coloring materials. By fluorescence spectrum together with FTIR, XRD and TGA analysis, it was concluded that the chitosan molecules could spontaneous transfer from solution onto cotton surface yet would not influence its internal structure. In order to color the chitosan-treated cotton, an anionic polystyrene-encapsulated copper phthalocyanine (CuPc) pigment was prepared in a miniemulsion process. The full encapsulation of nano-pigment could be directly observed by TEM . The encapsulation would not alter the crystal structure and color properties of CuPc while could make the nano-pigment more stable against centrifuge and temperature variation. Finally, the dyeing properties of this encapsulated nano-pigment on chitosan-treated cotton samples were studied. It was indicated the chitosan molecules on cotton had great capability to improve the uptake of encapsulated nano-pigment mainly due to the accessible amino groups introduced.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 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）