Colloids and Interfaces最新文献_第8页

Electrostatically Driven Vertical Combinatorial Patterning of Colloidal Nano-Objects 胶体纳米物体的静电驱动垂直组合图案化

IF 2.4

Colloids and Interfaces Pub Date : 2023-01-15 DOI: 10.3390/colloids7010006

Gaëtan Petit, Romain Hernandez, S. Raffy, A. Cuche, Lorena Soria Marina, Michele D’Amico, E. Palleau, L. Ressier

引用次数: 0

Polyacrylic-Co-Maleic-Acid-Coated Magnetite Nanoparticles for Enhanced Removal of Heavy Metals from Aqueous Solutions 聚丙烯-共聚物-马来酸包覆磁铁矿纳米颗粒增强水中重金属的去除

IF 2.4

Colloids and Interfaces Pub Date : 2023-01-12 DOI: 10.3390/colloids7010005

Rawan Mlih, Jonathan Suazo-Hernández, Yan Liang, E. Tombácz, R. Bol, E. Klumpp

引用次数: 1

Anion Effects on the Liquid-Liquid Equilibrium Behavior of Pluronic L64 + Water + Sodium Salts at Different pH: Determination of Thermodynamic Parameters 阴离子对不同pH下Pluronic L64 +水+钠盐液-液平衡行为的影响:热力学参数的测定

IF 2.4

Colloids and Interfaces Pub Date : 2023-01-10 DOI: 10.3390/colloids7010004

Edson G. Monteiro-Junior, J. M. Costa, O. A. Jimenez, B. R. de Souza, Abimael C. Medeiros, R. Basso

引用次数: 0

Asphaltene Precipitation and the Influence of Dispersants and Inhibitors on Morphology Probed by AFM AFM探测沥青质沉淀及其分散剂和抑制剂对形貌的影响

IF 2.4

Colloids and Interfaces Pub Date : 2023-01-10 DOI: 10.3390/colloids7010003

D. Mojica, Mauricio Angeles, Oscar Alvarez, D. Pradilla

{"title":"Asphaltene Precipitation and the Influence of Dispersants and Inhibitors on Morphology Probed by AFM","authors":"D. Mojica, Mauricio Angeles, Oscar Alvarez, D. Pradilla","doi":"10.3390/colloids7010003","DOIUrl":"https://doi.org/10.3390/colloids7010003","url":null,"abstract":"Bridging the gap between laboratory-scale experiments and actual oilfield operations is a complex task that requires a compromise between real (authentic) fluids and model systems. Commercial products (i.e., asphaltene inhibitors and dispersants) are often designed to target a wide range of operating conditions and compositions of crude oils, which means that the performance becomes almost case-specific. Through Atomic Force Microscopy (AFM) imaging and Transmission/Backscattering signals (T/BS), the morphology of asphaltene deposits and the mechanisms that eventually lead to precipitated material were evaluated. Two different models (starting solutions) with four different n-alkanes were used to induce variability in asphaltene agglomeration and subsequent precipitation paths. It was found that increasing the carbon number shifted the observed precipitation detection time (T/BS data suggested a shift in the order of ~1000 s when comparing low and high carbon numbers) and influences the density of the precipitated material under static and a sufficiently high concentration of solvent conditions. Further analysis on the morphology of the resulting material after the addition of commonly used chemicals showed that asphaltene stability through inhibition (i.e., blockage or crowding of potential active sites) led to smaller complexes. One of the additives (PIBSA) reduced the average height in ~33% and the mean square roughness in ~72%. On the other hand, stability through dispersion (i.e., hindering agglomeration) leads to a polymer-like network bigger in size, noting that in both cases the system remains soluble. The use of APR resulted in an increase of ~41% and ~54% for the same parameters. This insight sheds light on how to devise efficient chemical strategies to prevent flow assurance issues.","PeriodicalId":10433,"journal":{"name":"Colloids and Interfaces","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46303664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Interplay of Interfacial and Rheological Properties on Drainage Reduction in CO2 Foam Stabilised by Surfactant/Nanoparticle Mixtures in Brine 界面和流变特性对表面活性剂/纳米粒子混合物在盐水中稳定的CO2泡沫排水还原的影响

IF 2.4

Colloids and Interfaces Pub Date : 2023-01-05 DOI: 10.3390/colloids7010002

Beatriz Ribeiro Souza de Azevedo, B. G. Alvarenga, A. M. Percebom, A. Pérez-Gramatges

{"title":"Interplay of Interfacial and Rheological Properties on Drainage Reduction in CO2 Foam Stabilised by Surfactant/Nanoparticle Mixtures in Brine","authors":"Beatriz Ribeiro Souza de Azevedo, B. G. Alvarenga, A. M. Percebom, A. Pérez-Gramatges","doi":"10.3390/colloids7010002","DOIUrl":"https://doi.org/10.3390/colloids7010002","url":null,"abstract":"Although nanoparticles (NPs) are known to increase foam stability, foam stabilisation is not observed in all surfactant/NP combinations. The present study evaluates the stability of CO2 foams containing surfactant/NP mixtures with attractive or repulsive electrostatic interactions at the low pH imposed by CO2 in the presence of a high-salinity brine. Three ionic surfactants and two oxide NPs (SiO2 and Al2O3) were used in combinations of similar or opposite charges. Surface tension, viscosity, ζ-potential and hydrodynamic size experiments allowed the analysis of CO2 foam stability based on the impact of surfactant–NP interactions on bulk and interfacial properties. All oppositely charged systems improved the foam half-life; however, a higher NP concentration was required to observe a significant effect when more efficient surfactants were present. Both bulk viscosity and rigidity of the interfacial films drastically increased in these systems, reducing foam drainage. The mixture of SiO2 with a zwitterionic surfactant showed the greatest increase in CO2 foam stability owing to the synergy of these effects, mediated by attractive interactions. This study showed that the use of NPs should be tailored to the surfactant of choice to achieve an interplay of interfacial and rheological properties able to reduce foam drainage in applications involving CO2 foam in brine.","PeriodicalId":10433,"journal":{"name":"Colloids and Interfaces","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46724113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Casein-Hydrolysate-Loaded W/O Emulsion Preparation as the Primary Emulsion of Double Emulsions: Effects of Varied Phase Fractions, Emulsifier Types, and Concentrations 酪蛋白水解液负载W/O乳化液制备双乳的主乳:不同相分数、乳化剂类型和浓度的影响

IF 2.4

Colloids and Interfaces Pub Date : 2022-12-28 DOI: 10.3390/colloids7010001

P. Salum, Çağla Ulubaş, O. Güven, L. Y. Aydemir, Z. Erbay

{"title":"Casein-Hydrolysate-Loaded W/O Emulsion Preparation as the Primary Emulsion of Double Emulsions: Effects of Varied Phase Fractions, Emulsifier Types, and Concentrations","authors":"P. Salum, Çağla Ulubaş, O. Güven, L. Y. Aydemir, Z. Erbay","doi":"10.3390/colloids7010001","DOIUrl":"https://doi.org/10.3390/colloids7010001","url":null,"abstract":"Stable primary emulsion formation in which different parameters such as viscosity and droplet size come into prominence for their characterization is a key factor in W/O/W emulsions. In this study, different emulsifiers (Crill™ 1, Crill™ 4, AMP, and PGPR) were studied to produce a casein-hydrolysate-loaded stable primary emulsion with lower viscosity and droplet size. Viscosity, electrical conductivity, particle size distribution, and emulsion stability were determined for three different dispersed phase ratios and three emulsifier concentrations. In 31 of the 36 examined emulsion systems, no electrical conductivity could be measured, indicating that appropriate emulsions were formed. While AMP-based emulsions showed non-Newtonian flow behaviors with high consistency coefficients, all PGPR-based emulsions and most of the Crill™-1- and -4-based ones were Newtonian fluids with relatively low viscosities (65.7–274.7 cP). The PGPR-based emulsions were stable for at least 5 days and had D(90) values lower than 2 µm, whereas Crill™-1- and -4-based emulsions had phase separation after 24 h and had minimum D(90) values of 6.8 µm. PGPR-based emulsions were found suitable and within PGPR-based emulsions, and the best formulation was determined by TOPSIS. Using 5% PGPR with a 25% dispersed phase ratio resulted in the highest relative closeness value. The results of this study showed that PGPR is a very effective emulsifier for stable casein-hydrolysate-loaded emulsion formations with low droplet size and viscosity.","PeriodicalId":10433,"journal":{"name":"Colloids and Interfaces","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43225177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Enzymatic Hydrolysis on Solubility and Emulsifying Properties of Lupin Proteins (Lupinus luteus) 酶解对芦苹蛋白溶解度和乳化性能的影响

IF 2.4

Colloids and Interfaces Pub Date : 2022-12-15 DOI: 10.3390/colloids6040082

Mauricio Opazo-Navarrete, C. Burgos-Díaz, Karla A. Garrido-Miranda, Sergio-Miguel Acuña-Nelson

{"title":"Effect of Enzymatic Hydrolysis on Solubility and Emulsifying Properties of Lupin Proteins (Lupinus luteus)","authors":"Mauricio Opazo-Navarrete, C. Burgos-Díaz, Karla A. Garrido-Miranda, Sergio-Miguel Acuña-Nelson","doi":"10.3390/colloids6040082","DOIUrl":"https://doi.org/10.3390/colloids6040082","url":null,"abstract":"Solubility and emulsifying properties are important functional properties associated with proteins. However, many plant proteins have lower techno-functional properties, which limit their functional performance in many formulations. Therefore, the objective of this study was to investigate the effect of protein hydrolysis by commercial enzymes to improve their solubility and emulsifying properties. Lupin protein isolate (LPI) was hydrolyzed by 7 commercial proteases using different E/S ratios and hydrolysis times while the solubility and emulsifying properties were evaluated. The results showed that neutral and alkaline proteases are most efficient in hydrolyzing lupin proteins than acidic proteases. Among the proteases, Protamex® (alkaline protease) showed the highest DH values after 5 h of protein hydrolysis. Meanwhile, protein solubility of LPI hydrolysates was significantly higher (p < 0.05) than untreated LPI at all pH analyzed values. Moreover, the emulsifying capacity (EC) of undigested LPI was lower than most of the hydrolysates, except for acidic proteases, while emulsifying stability (ES) was significantly higher (p < 0.05) than most LPI hydrolysates by acidic proteases, except for LPI hydrolyzed with Acid Stable Protease with an E/S ratio of 0.04. In conclusion, the solubility, and emulsifying properties of lupin (Lupinus luteus) proteins can be improved by enzymatic hydrolysis using commercial enzymes.","PeriodicalId":10433,"journal":{"name":"Colloids and Interfaces","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42475514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Interfacial Dynamics of Adsorption Layers as Supports for Biomedical Research and Diagnostics 吸附层的界面动力学作为生物医学研究和诊断的支持

IF 2.4

Colloids and Interfaces Pub Date : 2022-12-13 DOI: 10.3390/colloids6040081

E. Santini, Irene Nepita, A. Bykov, F. Ravera, L. Liggieri, S. Dowlati, A. Javadi, Reinhard Miller, G. Loglio

引用次数: 3

Review on the Antioxidant Activity of Phenolics in o/w Emulsions along with the Impact of a Few Important Factors on Their Interfacial Behaviour 乳状液中酚类物质的抗氧化活性及几个重要因素对其界面行为的影响

IF 2.4

Colloids and Interfaces Pub Date : 2022-12-12 DOI: 10.3390/colloids6040079

Sotirios N. Kiokias, V. Oreopoulou

引用次数: 2

Prediction of Slip Velocity at the Interface of Open-Cell Metal Foam Using 3D Printed Foams 利用3D打印泡沫材料预测开孔金属泡沫界面的滑移速度

IF 2.4

Colloids and Interfaces Pub Date : 2022-12-12 DOI: 10.3390/colloids6040080

Khairul Azhar Mustapha, F. Shikh Anuar, Fatimah Al-Zahrah Mohd Saat

{"title":"Prediction of Slip Velocity at the Interface of Open-Cell Metal Foam Using 3D Printed Foams","authors":"Khairul Azhar Mustapha, F. Shikh Anuar, Fatimah Al-Zahrah Mohd Saat","doi":"10.3390/colloids6040080","DOIUrl":"https://doi.org/10.3390/colloids6040080","url":null,"abstract":"An open-cell metal foam gains a lot of interest from researchers due to its unique porous structure, which provides high surface area and good tortuosity, as well as being lightweight. However, the same structure also induces a massive pressure drop which requires an optimum design to suit applications, for example, a partially filled setup or staggered design. Thus, better attention to the slip velocity at the interface between the porous structure and non-porous region is required to maximize its potential, especially in thermal fluid applications. This study proposed a slip velocity model of an open-cell metal foam by using a reverse engineering method and 3D printing technology. A series of experiments and a dimensionless analysis using the Buckingham-Pi theorem were used to compute the slip velocity model. Results show that the pressure drop increases with decreasing pore size. However, the blockage ratio effects would be more significant on the pressure drop with foams of smaller pore sizes. The proposed slip velocity model for an open-cell metal foam agrees with the experimental data, where the predicted values fall within measurement uncertainty.","PeriodicalId":10433,"journal":{"name":"Colloids and Interfaces","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47388784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2