COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Lixiao Xiao,Jijun Wang,Yang Feng,Jie Wang,Jirui Hou
Nanoemulsions have been shown to significantly enhance imbibition-driven oil recovery in tight oil reservoirs, owing to their nanoscale droplets, low adsorption, and superior wettability alteration capabilities. However, they are susceptible to droplet growth and phase separation, resulting in destabilization and failure. Meanwhile, the relatively large droplets (typically ranging from 50 to 200 nm) restrict their access to smaller pores that contain significant hydrocarbon reserves, further decreasing the imbibition efficiency. In this study, we prepared an ultra-small droplet nanoemulsion (10–30 nm) with excellent stability by optimizing the types of nonionic surfactant and organic solvent employed. Cryo-transmission electron microscopy was used to elaborate the formation of ultra-small droplets, and the NMR imbibition tests were conducted to examine its enhanced imbibition effect. Experimental results showed that the ultra-small droplet nanoemulsion remained stable (with an average droplet diameter of 15 nm) for up to six months, far surpassing the stability of conventional large droplet nanoemulsions at a similar condition. This new nanoemulsion demonstrated a higher oil displacement contribution across various pores, achieving a 42.9% imbibition oil recovery, which was 27.1% and 6.5% higher than deionized water and conventional nanoemulsions, respectively, significantly enhancing the imbibition effect.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.3
Yuan Duan,Lingjia Qiu,Mengting Zhang,Yongbo Ding,Peilin Wang,Liang Shen
An eco-friendly, solvent-free waterborne hydroxyacrylate dispersion was developed using a castor-oil hyperbranched polyester polyol (COHPE) as a reactive diluent, enabling the preparation of two-component waterborne polyurethane (2 K WPU) coatings with intrinsic damping functionality. The COHPE was synthesized via esterification and incorporated into the waterborne hydroxyacrylate system to simultaneously reduce viscosity and enhance processability without the use of volatile organic solvents (VOC). The resulting dispersion (COHPE-WA-30) exhibited excellent colloidal stability and uniform particle sizes, while the cured films demonstrated a break strength of 6.81 MPa, elongation at break of 22.26%, and a static water contact angle of 86.2° ± 0.19°. Dynamic mechanical analysis (DMA) revealed the tan δ value remains greater than 0.3 within the temperature range of 43–101 °C, confirming superior damping performance. Moreover, the solvent-low 2 K WPU coatings achieved excellent adhesion (5B), gloss, and solvent resistance, combined with enhanced thermal stability. This study establishes an environmentally benign and scalable approach for fabricating high-performance 2 K WPU coatings that integrate renewable materials, solvent-low processing, and multifunctional mechanical-damping behavior.
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高影响因子
ACS Applied Polymer Materials
·
2026
·Vol. 8
·期 15
·12735-12746
·
IF 5.2
Wu Hongli,Wang Zhengyue,He Zhuang,Wang Yuan,Yang Guangyu,Mu Chenglin,Chen Jishuang,Cao Fei
2,5-Furandicarboxylic acid (FDCA), a key biobased monomer
for polyesters
and polyamides, must be highly purified, and this costly purification
hampers its commercialization. To circumvent this limitation, five
diester plasticizers containing alkyl, ether, or ester substituents
were synthesized from crude FDCA to modulate hydrogen-bonding interactions
in PVC blends. Diesters with unbranched chains and more hydrogen-bonding
interactions, bis(2-butoxyethyl) furan-2,5-dicarboxylate (FDCA-EG)
and bis(2-butoxy-2-oxoethyl) furan-2,5-dicarboxylate (FDCA-GA), exhibited
superior plasticization efficiency relative to the commercial plasticizer
DEHP, as evidenced by increased elongation at break and reduced glass-transition
temperature ( T g ). FTIR characterization
revealed a negative, quantitative correlation between T g and total hydrogen-bond strength, whereas mechanical
properties were insensitive to this parameter. Furthermore, the FDCA-based
plasticizers displayed markedly lower migration in hexane than in
DEHP.
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高影响因子
FUEL
·
2024
·
IF 6.7
Lixiao Xiao,Jirui Hou,Jiaqi Sun,Yulong Yang
Microemulsions demonstrate significant potential for enhancing oil recovery (EOR) owing to their remarkable abilities to reduce interfacial tension, alter wettability, and facilitate solubilization. However, the challenge remains in preparing dilutable single-phase microemulsions with large single-phase regions and tiny droplets. In this study, we developed an EOR-oriented single-phase microemulsion formulated using mixed nonionic-cationic surfactants. The system incorporated a biodegradable double-chain monosaccharide quaternary ammonium surfactant alongside a polyoxyethylene ether surfactant. D -limonene functioned as the oil phase, while propylene glycol butyl ether served as the co-surfactant. Transition regions and microstructures were revealed through conductivity tests and microscopic electron microscopy. Furthermore, the mechanisms of microstructure transition under various phase behaviors were explored by simulating the synergistic effects and interfacial distributions of mixed surfactants through molecular dynamics simulation.
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高影响因子
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