COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Han Jia,Juan He,Yingbiao Xu,Tingyi Wang,Lingyu Zhang,Bowen Wang,Xincan Jiang,Xu Li,Xingyuan Zhang,Kaihe Lv
The surfactant assisted nanoparticle stabilized emulsions exhibit the wide potential application and attract more and more attention. In the present study, the flake-like hydrophilic AlOOH nanoparticles were employed to stabilize Pickering emulsions with the assist of slightly amphiphilic sodium benzenesulfonate (SBS) molecules. The measurements of FTIR spectra , three-phase contact angle, zeta potential and Z-average diameter adequately testified the successful adsorption of SBS on AlOOH nanoparticles. Both slightly amphiphilic SBS and highly hydrophilic AlOOH nanoparticles could hardly stabilize emulsions, whereas the SBS modified AlOOH nanoparticles exhibited distinguished emulsifying capacity, which was reflected via the Turbiscan Stability Index and the reference values of backscattered light intensity . Batch adsorption experiments were conducted and the adsorption data was better fitted to the Langmuir model, suggesting that SBS could form monolayer adsorption on AlOOH nanoparticles. Confocal laser scanning microscopy and rheological measurements demonstrated that the functionalized AlOOH nanoparticles could spontaneously adsorb at the oil/water interface to form an interfacial film and generate a three-dimensional network structure in the continuous phase to effectively prevent droplet coalescence in normal and harsh conditions. Furthermore, SBS/AlOOH stabilized O/W emulsions presented significant displacement performance (tertiary oil recovery of 18.87%) in core flooding experiments. Microscopic visualization tests showed that the emulsions could block high permeability channels and enlarge the sweep area. This study opens up the possibility of adopting low surface-active molecules and hydrophilic nanoparticles to stabilize Pickering emulsions for enhanced oil recovery (EOR).
研究领域:
石油工程
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界面化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Pengkai Xie,Limin Cui,Mingdi Yu,Yulong Shao,Abdelaziz Elbarbary,Qingzhe Jin,Xingguo Wang,Jun Jin
Aerated emulsions find wide applications in the food industry, with partial coalescence playing a crucial role as the core of such products in whipping capabilities. Although tweens are the most traditional emulsifiers used in aerated emulsions, the microscopic mechanisms of how they work are still not fully understood. This study focused on elucidating the mechanisms of Tweens in fat crystallization, oil-water interface rheology, and fat globule interface membrane properties, clarifying their roles in partial coalescence and whipping capabilities. The fat crystals induced by Tween 20 (T20) faced difficulty in puncturing the interface membrane with a high elastic modulus (5.58 mN/m), which may constrain occurrence and progression of partial coalescence. Tween 60 (T60) and Tween 40 (T40) exhibited strong interactions with proteins, with the interface film formed by T60 having a high elasticity of up to 7.79 mN/m. However, the highest elasticity interface film formed by orogenic behavior from T60 was not conducive to the interaction between fat crystals and the interfacial proteins during the whipping process. T40 not only helps to stimulate fat crystallization and create interface films with appropriate elastic strength but also plays a role in enhancing foam quality as its concentration rises. This is supported by its rheological properties and microscopic structures. The interface membrane formed by Tween 80 (T80) was viscous, leading to a significant partial coalescence but poor foam quality. This study reveals the interaction mechanisms between fat crystallization, interface membrane, partial coalescence, and the structure of aerated emulsions regulated by Tweens.
研究领域:
食品科学
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胶体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Xueying Zhang,Junyan Wang,Xincheng Zhang,Lin He,Hong Sui,Xingang Li
The fine mineral particles often coexist in oil-water emulsions, enhancing the stability of oil-water emulsions. Herein, the micro SiO 2 was used to investigate its synergistic effects with the interfacially-active asphaltenes (IAA) on forming the strong interfacial film at the oil–water interface. This IAA-particle film showed high rigidity, allowing the emulsion droplets (4 μm − 20 μm) to be much more stable than the traditional asphaltene-stabilized emulsions. With the addition of the oxygen containing demulsifier (MJTJU-2, an alternated aliphatic alcohol nonionic polyether), this kind of emulsion could be broken significantly (over 99 % at the demulsifier concentration > 600 ppm and settling time > 45 min) with almost all of the microparticles transferring from oil phase to the water phase as particle net-like film. The optimal concentration (1000 ppm) of demulsifier were obtained. Further mechanistic study by QCM-D suggested that the desorption process of asphaltenes from solid surface could be divided into three main stages: the demulsifier molecules adsorbed and penetrated into the IAA adsorption film on solid surface; the simultaneous desorption of the adsorbed IAA and pre-adsorbed demulsifiers; the IAA film became loose and was destructed by the demulsifiers. AFM tests found that after addition of demulsifiers, the surface force between IAA and silica (0.0589 mN/m) decreased about 37 %. The MD simulation results showed that the demulsifier molecules would adsorb on the IAA film firstly by van der Waals and hydrogen bond, making the film much looser. The demulsifier could interact with the IAA molecule, resulting in desorption of IAA. Simultaneously, the demulsifier could compete for the adsorption sites on the IAA molecules by forming new hydrogen bonds, which destroyed the IAA adsorption layer. As a result, the stable IAA-solid film at oil–water interface could be broken. These findings would provide fundamental understanding to the stability and instability of IAA-solids co-stabilized oil–water emulsions, oil-sludge treatments.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2024
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IF 5.3
Pengkai Xie,Mingcui Huang,Jia Liu,Abdelaziz Elbarbary,Qingzhe Jin,Xingguo Wang,Jun Jin
Poor whipping capabilities of anhydrous milkfat based aerated emulsions pose a fresh challenge to food industrial production, limiting their potential applications in tea drinks, coffee, cakes, and desserts. In this study, the effects of high melting- and low melting-Spans on whipping compatibilities of the aerated emulsions were investigated from view of fat crystal-membrane interactions. With an increase in Spans concentration, there was a corresponding decrease in both fat globule size and interfacial protein. However, in comparison with low melting-Span 20 and Span 80, Span 40 and Span 60 with higher melting points have been found to improve anhydrous milkfat crystal matrix in terms of dense (D f > 1.8) and spot-like crystals (5–10 μm). The interfacial film strength was reduced in this case as both long chain-saturated Spans competitively absorb at the membrane, and elasticity-dominant interfacial membrane was further obtained as their crystallization effects. Occurrence and development of partial coalescence of fat globules (>80% at more than 0.5% addition) were therefore promoted with such fat crystal-membrane interactions during whipping, contributing to a significant improvement in whipping capabilities and heat-stable stabilities of foam structures. A mechanism on the effects of Spans on improving whipping capabilities of aerated emulsions was therefore proposed based on the fat crystal-membrane interactions, which will provide guidance to produce high-quality whipped structures for aerated emulsions.
研究领域:
食品科学
·
胶体化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xingtao Ma,Ying Liang,Fei Wu,Zimei Zhu,Chunmiao Xia,Huan Liu,Cuige Zhang,Maodong Xu
Janus emulsions have particularly drawn researchers' attention due to their asymmetrical morphology and anisotropic characteristics. However, except for Janus emulsions with liquid-liquid structures, other types of Janus emulsions have not been studied yet. Inspired by the occasional discovery that the water film on the foam surface freezes and transforms into a hard solid interface film below freezing point, a Janus emulsion was developed by using the phase change characteristics of solid paraffin wax. In this study, decane or perfluorooctane was used as the oil phase (O), solid paraffin wax as the solid interfacial film (S), and solutions of sodium dodecyl sulfate (SDS) or natural cellulose particles as the water phase (W). By controlling temperature and microgravity, hemispherical (O + S)/W and (S + O)/W type Janus phase change emulsions were successfully prepared. The experimental results show that paraffin wax content, oil phase density and polarity have significant effects on the stability and microstructure of emulsions. By calculating and fitting the solid-liquid interface ratio of Janus emulsions, the quantitative relationship between solid-liquid interface ratio, surfactant concentration and oil phase composition was obtained. This provides a theoretical basis and experimental basis for interface solid-state encapsulation and regulation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Liyu Zhang,Xuelai Zhang,Weisan Hua,Liqiang Gao,Wenhao Xie,Wenzhuang Zhang
As an important part of the heat dissipation system of electronic devices, thermal interface membranes (TIM) can largely eliminate the interface thermal resistance between electronic devices and heat sinks. However, the minimum thickness of TIM which is constrained by the maximum assembly pressure that the electronic chip can withstand and the marginal cost caused by the continuous improvement of thermal conductivity makes the development of conventional TIM bottlenecked. This paper proposes a novel laminar temperature control structure based on form-stable phase change material with thermal-induced flexibility (TF-FSPCM). When the TF-FSPCM is thin (<500 μm), the structure appears as a TIM. Different from conventional TIMs, the structure provides a unique lateral thermal conductivity channel to increase the maximum heat flux . And the TF-FSPCM simultaneously solves the problem of excessive assembly pressure and leakage of PCM. 6 wt% EG increases the thermal conductivity of PCM by 223 %. When the carbon fiber net (CFN) is functional layer material, the actual thermal resistance of CFN-TIM is not >0.79 cm 2 K/W and the minimum theoretical thermal resistance is <0.1 cm 2 K/W at the preparation pressure in 0.04 MPa. In particular, the assembly pressure on TF-FSPCM is reduced to a normal level due to its excellent self-repair. In addition, the membrane structure of CFN greatly improves the tensile strength and puncture resistance so that it has a broader application prospect. Finally, the actual temperature control experiments show that the equilibrium temperatures of CFN-TIM and CFN/CF-TIM are reduced by 12.8 °C and 15.6 °C, respectively. This indicates that the membrane structure has a small actual thermal resistance and a large elastic modulus . And it proves that the unique lateral conduction channel of the laminar composite structure has the actual heat dissipation ability.
研究领域:
电子工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Borong Wu,Yonghuan Ren,Daobin Mu,Xiaojiang Liu,Feng Wu
LiNi 0.5 Mn 1.5 O 4 electrode modification is achieved in this work through adding inorganic lithium carbonate (Li 2 CO 3 ) into carbonate electrolyte. Superior cyclic stability of the cathode in the range of 5–2 V is attained, a capacity of 0.3698 mAh g −1 is lost per cycle, which is half of the value in the Li 2 CO 3 -free condition. The capacity loss above and below 3.5 V are both alleviated in the presence of Li 2 CO 3 . Its effect on both the electrolyte bulk and the cathode surface is analyzed with SEM , TEM and XPS measurements. The density functional theory (DFT) calculation is carried out to discuss the modification mechanism. It is speculated that Ni 4+ ⋯CO 3 2− coordination may be formed through the interaction between Ni and O, weakening the oxidizability of Ni 4+ on the electrode surface . In addition, Li 2 CO 3 can consume PF 5 in the electrolyte. The interphase film can also maintain thin and steady during the cycling within 5–2 V.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Yaozong Yang,Jie Wang,Zhaolin Li,Zhao Yang,Bo Wang,Hailei Zhao
Constructing a robust solid electrolyte interphase (SEI) is extremely critical to developing high-energy-density silicon (Si)-based lithium-ion batteries. However, it is still elusive how to accurately manipulate the chemical composition and structure of the SEI layer. Herein, a LiF-dominated SEI film intertwined by a highly elastic polymer is achieved by regulating the defluorination mechanism of the fluorinated carbonate additive on the Si electrode surface. The experimental and computational results confirm that the decomposition route of trans-difluoroethylene carbonate (DFEC) molecules can be significantly altered in the presence of lithium difluoro(oxalato)borate (LiDFOB) additive. The induction of direct defluorination of DFEC step by LiDFOB, as opposed to the breaking of C–O bonds without LiDFOB addition, is crucial in ensuring the exclusive formation of LiF-dominated SEI and maintaining the cyclic structure of DFEC. The defluorinated DFEC easily polymerizes to form poly(vinylene carbonate), enhancing the elasticity of the SEI. The resulting LiF-dominated SEI film with a polymer interwoven outer layer shows enhanced ionic conductivity and mechanical stability, which can effectively accelerate electrode reaction kinetics and maintain the structural stability of the Si electrode. As a result, the Si electrode with the electrolyte containing the designed dual-additive exhibits superior cycling stability and excellent rate performance, delivering a high reversible capacity of 1487.3 mAh g–1 after 1000 cycles at 2 A g–1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Hui Yang,Minghao Zhang,Junting Wang,Shengnan Wang,Shumin Wang,Lina Yang,Peng Wang,Hong Song,He Liu,Yutang He
The applications of polysaccharides as emulsifiers are limited due to the lack of hydrophobicity . However, traditional hydrophobic modification methods used for polysaccharides are complicated and involve significant mechanical and thermal losses. In this study, soy hull polysaccharide (SHP) and terminally aminopropylated polydimethylsiloxane (NPN) were selected to investigate the feasibility of a simple and green interfacial membrane strengthening strategy based on the interfacial polymerization of anionic polysaccharides and fat-soluble alkaline ligands. Our results show that deprotonated SHP and protonated NPN can be complexed at the water/oil (W/O) interface, reduce interfacial tension, and form a strong membrane structure. Moreover, they can quickly form a membrane at the W/O interface upon the moment of contact to produce stable all-liquid printing products with complex patterns. However, the molecular weight of NPN affects the complexation reaction. Consequently, this study has long-term implications to expanding the areas of application for anionic polysaccharides.
研究领域:
食品科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Pengcheng Shi,Linchao Zhang,Hongfa Xiang,Xin Liang,Yi Sun,Wu Xu
The notorious lithium (Li) dendrites and the low Coulombic efficiency (CE) of Li anode are two major obstacles to the practical utilization of Li metal batteries (LMBs). Introducing a dendrite-suppressing additive into nonaqueous electrolytes is one of the facile and effective solutions to promote the commercialization of LMBs. Herein, Li difluorophosphate (LiPO2F2, LiDFP) is used as an electrolyte additive to inhibit Li dendrite growth by forming a vigorous and stable solid electrolyte interphase film on metallic Li anode. Moreover, the Li CE can be largely improved from 84.6% of the conventional LiPF6-based electrolyte to 95.2% by the addition of an optimal concentration of LiDFP at 0.15 M. The optimal LiDFP-containing electrolyte can allow the Li||Li symmetric cells to cycle stably for more than 500 and 200 h at 0.5 and 1.0 mA cm–2, respectively, much longer than the control electrolyte without LiDFP additive. Meanwhile, this LiDFP-containing electrolyte also plays an important role in enhancing the cycling stability of the Li||LiNi1/3Co1/3Mn1/3O2 cells with a moderately high mass loading of 9.7 mg cm–2. These results demonstrate that LiDFP has extensive application prospects as a dendrite-suppressing additive in advanced LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Materials and Technologies
·
2021
·
IF 7.053
Chunhong Nie,Huan Du,Yupeng Zhang,Guoqiang Han,Heting Wang,Dandan Yuan,Baohui Wang,Xirui Wang
Oil/water separation has become a significant issue since emulsions are detected in many industrial wastewater and severely threaten the ecological environment. Developing separation technique driven by solar energy with high separation efficiency is quite meaningful and challenging. In this work, solar electrical role on an interfacial film of emulsions was developed for efficient oil/water separation. Emulsified oil/water droplets from the ASP flooding were chosen to characterize the influence of solar electrical role on demulsification. Droplet size distribution , zeta potential , interfacial tension, viscosity, microscope image, and rheological properties were systematically studied to explore the mechanism of electrical role on the instability of oil droplets . Experimental results indicate solar electrical role on the oil-water interface can change the properties of the interface, help the oil-water emulsion instability, and promote oil-water separation. The instability mechanism of the emulsion can be summarized as the following. Firstly, the charged oil/water droplets interfere with the original electric field, which generates a force along with the droplet's tangential direction. Secondly, the force drives charged groups to radially migrate away from the electrode, which causes the entangled polymer to loosen, expand, and rearrange interface charges, resulting in decreasing in the rigidity and zeta potential. Thirdly, the force also promotes the electrohydrodynamic flow of oil/water droplets. The adjacent oil/water droplets mutually entrained in electrohydrodynamic fluid flow, resulting in coalescence . Furthermore, the interface-active components can be electrochemically oxidized to small molecular. The in-depth research of solar electrical role on interfacial film provides theoretical support for coupling of solar photo effect and thermal effect, to obtain highly efficient solar demulsification.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Kun Fang,Cui Du,Junshuai Zhang,Chen Zhou,Shengyang Yang
In recent years, the solar-driven interfacial evaporation system (SIES) has obtained a lot of interest as a potential solution to freshwater scarcity. However, the organic pollutant residues affected the practical application of the distillate generated by SIES. Herein, a solar interfacial membrane (AuNPs@g-C 3 N 4 /CMF) (AMF) for desalination and removal of multiple water pollutants was prepared by generating Au-doped carbon nitride (AuNPs@g-C 3 N 4 ) directly on the carbonized melamine (CMF) through a co-calcination process. The designed membrane features excellent light absorption, efficient water supply, and low thermal conductivity . All the above advantages of the AMF membrane contributed to an outstanding evaporation rate (1.675 kg m -2 h -1 ) and high photothermal conversion efficiency (94.03%) under 1 sun irradiation. For seawater desalination, the membrane performed well in removing ions from simulated seawater and demonstrated good stability during long-term desalination. Meanwhile, the membrane still exhibits a high evaporation rate (1.24 kg m -2 h -1 ) even in a 10% salt solution environment. Owing to the photocatalysis capability of AuNPs@g-C 3 N 4 , the AMF membrane also performs effectively in the removal of organic dyes and formaldehyde.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）