Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献

{"title":"Microcrystalline cellulose modified chitosan aerogels to enhance Congo Red dye adsorption","authors":"Melina Kloster ,&nbsp;Norma E. Marcovich ,&nbsp;Mirna A. Mosiewicki","doi":"10.1016/j.colsurfa.2024.135823","DOIUrl":"10.1016/j.colsurfa.2024.135823","url":null,"abstract":"<div><div>Carbohydrate based aerogels were synthesized via a straightforward procedure including freeze-drying of chitosan (Ch) hydrogels of different concentrations cross-linked with glutaraldehyde and incorporating microcrystalline cellulose (MCC) powder to enhance mechanical strength and modify adsorption properties. The increase in Ch content and the incorporation of MCC resulted in samples that exhibited higher densities, lower swelling degrees and accessible porosities while demonstrated improved stabilities. These aerogels were evaluated as adsorbents of the textile dye Congo Red (CR) by isothermal and kinetic studies. Even when relatively simple theoretical models were used to predict these results, in order to eliminate modeling bias, a validation method based on error functions in addition to the more commonly used R², was applied. Equilibrium adsorption capacities obtained in kinetic studies increased 150 % changing Ch concentration from 4 % to 5 %, and 196 % adding 50 % by weight of MCC. The adsorption tests for initial concentrations of CR below 100 mg/L demonstrated that the aerogels exhibited increased adsorption capacity for higher Ch content or incorporation of MCC. Thermodynamic studies indicated enhanced adsorption at higher temperatures. These environmentally friendly aerogels demonstrated comparable or superior adsorption capacities to other bio-based materials, offering a simple, economical, and effective solution for pollutant removal.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135823"},"PeriodicalIF":4.9,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and tribological study of a novel thiadiazole derivative as multifunctional lubricant additive","authors":"Junyang Dong ,&nbsp;Qihao Sun ,&nbsp;Songwei Zhang ,&nbsp;Enhui Zhang ,&nbsp;Wenwen Ma ,&nbsp;Yanan Wang ,&nbsp;Weimin Li ,&nbsp;Xiaobo Wang","doi":"10.1016/j.colsurfa.2024.135825","DOIUrl":"10.1016/j.colsurfa.2024.135825","url":null,"abstract":"<div><div>A 2,5-bis-dodecyldisulfanyl-3-ethyl-1,3,4-thiadiazole (BDET) based ionic liquid (IL) was synthesized and its tribological performance as an additive in ester-based oil (DIPE) was evaluated. The tribological performance of [BDET][BF₄] was compared with that of a commercial additive, zinc dialkyl dithiophosphates (ZDDP). It was found that [BDET][BF₄] resulted in a 12 % reduction in the friction coefficient in comparison to base oil. Furthermore, it displays excellent wear protection characteristics, exhibiting the lowest wear volume, which is half that of ZDDP and only one-fifteenth of the base oil. Noteworthily, [BDET][BF₄] is capable of forming a tribofilm with a thickness of 2 μm, which is more than 10 times greater than that of ZDDP. Surface analysis indicates that the outstanding tribological performance of [BDET][BF₄] is attributable to the coexistence of an adsorption layer and a tribo-chemical reaction film. Moreover, the presence of a thiadiazole group in its molecular structure enables [BDET][BF₄] to exhibit effective corrosion inhibition towards copper. In general, the simple preparation procedure, favorable tribological characteristics and anticorrosion properties make [BDET][BF₄] an effective multifunctional additive in lubricants.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135825"},"PeriodicalIF":4.9,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of mucilage from Opuntia cochenillifera cladodes: Rheological behavior, cytotoxicity, and antioxidant potential","authors":"Shênia Santos Monteiro ,&nbsp;Joao Vitor Souto de Araujo Queiroz ,&nbsp;Henrique Mautone Gomes ,&nbsp;Lucas Santos ,&nbsp;José Cláudio Fonseca Moreira ,&nbsp;Daniel Pens Gelain ,&nbsp;Marcus Vinícius Lia Fook ,&nbsp;Hugo Miguel Lisboa ,&nbsp;Matheus Augusto de Bittencourt Pasquali","doi":"10.1016/j.colsurfa.2024.135824","DOIUrl":"10.1016/j.colsurfa.2024.135824","url":null,"abstract":"<div><div>This study explores the extraction of mucilage from cladodes of <em>O. cochenillifera</em>, an underutilized species of the <em>Opuntia</em> genus, in water at room temperature and under continuous stirring, avoiding harsh solvents and high temperatures to preserve its physicochemical and biological properties. Biological safety evaluation of the mucilage revealed cell viability exceeding 70 % at various concentrations (0.05 – 5000 µg/mL) through 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl-tetrazolium (MTT) and sulforhodamine B (SRB) assays. However, the analyses of antioxidant potential revealed insufficient protective effects against oxidative stress across all tested concentrations, indicating the need for a more complex study to understand the sample's antioxidant capacity fully. Additionally, a non-Newtonian fluid behavior was observed during rheological studies and was characterized by shear thinning. Significant variations in viscosity were noted in response to temperature, pH, and concentration, highlighting the mucilage's sensitivity to environmental and compositional conditions. This work not only expands the understanding of the biological viability and physical properties of <em>O. cochenillifera</em> mucilage but also highlights its potential application as a multifunctional, sustainable, and safe biopolymer for the food, cosmetic, and biomedical industries. These results establish a robust scientific foundation for future investigations into the development of natural and biocompatible additives, significantly contributing to the advancement of sustainable and environmentally friendly alternatives across multiple industrial sectors.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135824"},"PeriodicalIF":4.9,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selenium nanoparticles stabilized with Tween 80: Synthesis, characterization, and application in fortified milk and fermented dairy products","authors":"Andrey Blinov ,&nbsp;Andrey Nagdalian ,&nbsp;Alexander Serov ,&nbsp;Anastasiya Blinova ,&nbsp;Zafar Rekhman ,&nbsp;Alexey Gvozdenko ,&nbsp;Alexey Golik ,&nbsp;Alina Askerova ,&nbsp;Maxim Pirogov ,&nbsp;Maxim Kolodkin ,&nbsp;Seid Mahdi Jafari","doi":"10.1016/j.colsurfa.2024.135822","DOIUrl":"10.1016/j.colsurfa.2024.135822","url":null,"abstract":"<div><div>This study presents the synthesis selenium nanoparticles (SeNPs), stabilized with Tween-80 (Tw) for potential fortification of milk and fermented dairy products. SeNPs were prepared by chemical reduction with ascorbic acid in an aqueous medium. Optimal synthesis parameters were obtained using neural network optimization. Quantum chemical modeling showed that the Se-Tw interaction is an energetically favorable process (<em>∆E</em> &lt; −80 kcal/mol), and the Se-Tw molecular complex is chemically stable (η = 0.078 eV). In turn, the stability of SeNPs was tested by forming solutions with different pH and ionic strength values. It was found that SeNPs stabilized with Tw (SeNPs-Tw) have a negligible effect on the physicochemical parameters of the dispersed phase of milk. A slight increase in titrated acidity by 1–3 °T and a decrease in pH by 0.05–0.12 were detected in experimental milk samples. during 21-days storage. Surprisingly, addition of SeNPs increased the average hydrodynamic radius of disperse composition of milk with 1.5, 2.5 and 3.2 % fat from 24 to 27 nm to 37–38 nm. It is worth noting that titratable acidity increased smoothly in all presented samples and to 120 ± 10 °T, which is in the required range for fermented dairy products. Interestingly, SeNPs-Tw had a stimulating effect on the growth of lactic acid bacteria. Thus, the number of <em>L. acidophilus</em> was higher in the experimental sample with a maximum at SeNPs-Tw concentration equivalent to 30 % of Se recommended daily allowance. Consequently, functional fermented milk products fortified with SeNPs-Tw can potentially become a solution to the problem of a colossal Se deficiency.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"706 ","pages":"Article 135822"},"PeriodicalIF":4.9,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of surfactants on the interface characteristics and imbibition processes in shale oil reservoirs","authors":"Ning Xu ,&nbsp;Yanling Wang ,&nbsp;Chuanbao Zhang ,&nbsp;Baojun Bai ,&nbsp;Di Li ,&nbsp;Yu Zhang ,&nbsp;Wenjing Shi ,&nbsp;Wenhui Ding","doi":"10.1016/j.colsurfa.2024.135818","DOIUrl":"10.1016/j.colsurfa.2024.135818","url":null,"abstract":"<div><div>Imbibition is a crucial method for shale reservoir development. However, the mechanism underlying the surfactant-enhanced imbibition in shale oil reservoirs remains unclear. The mainstream perspective holds that wettability is the determining factor, whereas alternative views suggest that ultra-low interfacial tension and emulsification ability are more conducive to improving imbibition recovery. In this study, we investigated the effects of three surfactant solutions (zwitterionic, anionic, and non-ionic) on the imbibition recovery and rate of shale oil reservoirs using spontaneous imbibition experiments. The ability of surfactants to alter the shale surface wettability, reduce the oil–water interfacial tension, and promote spontaneous emulsification was examined. The mechanism of surfactant-enhanced imbibition recovery in shale reservoirs was analysed using the dynamic inverse bond number (N_B⁻¹). The results show that surfactant solutions can improve the imbibition recovery of shale oil reservoirs. At a concentration of 1.167 mM, the imbibition recovery was in the order of cocoamidopropyl betaine (CAB, 25.6 %) &gt; sodium dodecyl benzene sulfonate (SDBS,17.51 %) &gt; isooctyl alcohol polyoxyethylene ether (JFC,11.39 %). In additional, the surfactants improved the imbibition rate during the late stage. Wettability is the primary factor in improving imbibition recovery. Spontaneous emulsification is another crucial factor affecting imbibition recovery in shale oil reservoirs. The transport of oil droplets/emulsion in the shale pore space occurs in a ‘laminar flow’ mode. It is necessary to control the timing of water films filling the pore space because high interfacial tension can lead to rapid filling, causing ‘jamming’ of the emulsion at the throat. The dynamic N_B⁻¹ value analysis shows that gravity dominates imbibition in the early stage, whereas both gravity and capillary pressure dominate in the late stage. Furthermore, the emulsifying effect of the surfactant should be fully utilized in the late stage of imbibition to promote emulsion transport in the pore throats via the ‘laminar flow’ mode. The results of this study suggest that future research on spontaneous imbibition in shale oil reservoirs should focus on emulsification, particularly its impact on the migration of emulsions and oil droplets within pores, to identify new strategies for shale oil reservoir development.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"706 ","pages":"Article 135818"},"PeriodicalIF":4.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing water resistance of metal-organic frameworks","authors":"Shufan Li,&nbsp;Jianquan Li,&nbsp;Qingyu Ma","doi":"10.1016/j.colsurfa.2024.135817","DOIUrl":"10.1016/j.colsurfa.2024.135817","url":null,"abstract":"<div><div>Developing metal-organic frameworks (MOFs) with high water resistance is of high significance because it can largely extend their applications, such as catalysis and adsorption in aqueous solutions. Herein, we present a typical MOF, i.e., CuBTC [Cu₃(BTC)₂(H₂O)₃]_n (BTC = benzene-1,3,5-tricarboxylate) with high water resistance by post-modification reactions with six commercially available silanes at room temperature, resulting in CuBTC@SILANE. Various techniques demonstrated that the modification successfully incorporates organosilicon moieties on the surface of CuBTC without altering its original structure, significantly enhancing its water resistance. In contrast to pristine CuBTC, CuBTC@SILANE maintains its crystallinity, morphology, and pore structure even after prolonged exposure to water. The modified MOF also exhibits superior stability in various solvents and enhances CO₂ adsorption efficiency, retaining high CO₂ adsorption capacity even after exposure to water for 1 day. This simple silane modification approach not only addresses the water sensitivity of CuBTC but also holds promise for extending the aqueous applications of other similar MOFs, thereby broadening their potential uses in catalysis and adsorption.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135817"},"PeriodicalIF":4.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular dynamics simulation of the effect of calcium ions on the foamability of anionic surfactants","authors":"Lijing Du,&nbsp;Sijing Wang,&nbsp;Tongyuan Zhang,&nbsp;Chaohang Xu","doi":"10.1016/j.colsurfa.2024.135819","DOIUrl":"10.1016/j.colsurfa.2024.135819","url":null,"abstract":"<div><div>The presence of calcium ions in hard water significantly affects the foaming properties of surfactants, thereby limiting their effectiveness in industrial and everyday applications. This study aims to investigate how varying concentrations of calcium ions influence the foaming abilities of several surfactants. A combination of experimental analysis and molecular dynamics (MD) simulations was employed to examine three typical anionic surfactants: sodium laureth sulfate (AES), sodium alkane sulfonate (SAS-60), and sodium dodecylbenzene sulfonate (SDBS). Experimental results indicated that calcium ions exert inhibitory effects on the foaming characteristics of these anionic surfactants to varying degrees. MD simulations further revealed that calcium ions hinder the interactions between surfactant head groups and water molecules, displaying a strong tendency to bind with the head groups. The presence of calcium ions diminishes the electrostatic interactions among surfactants and alters their molecular arrangement. In addition, calcium ions infiltrate the interface between the head groups and water, restricting the mobility of water molecules. These findings suggest that interactions between counterions, such as sodium and calcium ions, and surfactants are critical factors contributing to the reduction in foaming ability. However, the ethylene oxide (EO) groups in AES can partially mitigate the binding of calcium ions to the head groups, thereby maintaining their foaming ability in hard water.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135819"},"PeriodicalIF":4.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, characterization, theoretical, and evaluation of eco-friendly phenytoin-based corrosion inhibitors for mild steel","authors":"Walid Ettahiri ,&nbsp;Abderrazzak El Moutaouakil Ala Allah ,&nbsp;Jamila Lazrak ,&nbsp;El-Houssaine Safir ,&nbsp;Krishna Kumar Yadav ,&nbsp;Lamjed Mansour ,&nbsp;Jameel H. Al-Tamimi ,&nbsp;Zakia Rais ,&nbsp;Youssef Ramli ,&nbsp;Mustapha Taleb","doi":"10.1016/j.colsurfa.2024.135816","DOIUrl":"10.1016/j.colsurfa.2024.135816","url":null,"abstract":"<div><div>This study explores the corrosion inhibition potential of two newly synthesized phenytoin-based compounds, (<em>E</em>)-2-(2-(2-chlorobenzylidene)hydrazineyl)-5,5-diphenyl-3,5-dihydro-4<em>H</em>-imidazol-4-one (2-ClPh-DDI) and (<em>E</em>)-2-(2-(2,4-dichlorobenzylidene)hydrazineyl)-5,5-diphenyl-3,5-dihydro-4<em>H</em>-imidazol-4-one (2,4-diClPh-DDI), in 1 M HCl solution. Both compounds exhibited remarkable inhibition efficiencies, reaching 97.7 % and 98.6 %, respectively. Comprehensive structural characterization was conducted using fourier-transform infrared spectroscopy, nuclear magnetic spectroscopy, and high-resolution mass spectrometry, both inhibitors demonstrated high purity and stability. Theoretical evaluations, including Monte Carlo simulation and density functional theory calculations, confirmed high reactivity and strong inhibition capabilities. Electrochemical measurements demonstrated a concentration-dependent inhibition effect, sustained up to 328 K. Adsorption isotherms revealed that these inhibitors effectively displace water molecules, forming a robust adsorbed layer that protects the mild steel surface. Surface analysis using microscopy confirmed the formation of protective layers and the presence of iron-inhibitor complexes, highlighting the compounds’ effectiveness in mitigating corrosion. The combined experimental and theoretical insights underscore the promising role of these phenytoin derivatives as eco-friendly corrosion inhibitors for mild steel.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135816"},"PeriodicalIF":4.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In situ synthesis of Fe3O4/ carboxylated multi-walled carbon nanotubes nanostructures on nylon fabric with efficient flame retardant and antibacterial properties","authors":"Kamyab Karami Hoomani ,&nbsp;Komeil Nasouri ,&nbsp;Mansoor Mandegari ,&nbsp;Seyed Amir Hossein Jalali","doi":"10.1016/j.colsurfa.2024.135797","DOIUrl":"10.1016/j.colsurfa.2024.135797","url":null,"abstract":"<div><div>Knitted fabrics are ideal for flexible, conductive, and magnetic smart textiles but have low adhesion for materials, especially inorganic ones. In this study, carboxylated multi-walled carbon nanotubes (MWCNT-COOH) and magnetite (Fe₃O₄) magnetic nanoparticles were synthesized in situ and then coated onto nylon knitted fabric. Using nylon and in situ coating of these nanostructures enhances nanotube absorption via hydrogen bonding and provides magnetite growth sites on both the coated nanotubes and the fabric surface, due to the direct attraction of positively charged iron salts to the polar bonds of nylon. The effect of the weight ratio on the characteristics was evaluated through the coatings with Fe₃O₄ to MWCNT-COOH at different ratios. Surface structure, chemical analysis, microstructure, electrical conductivity, magnetic properties, antibacterial properties, zeta potential, and thermal properties were studied. FESEM results and surface structure evaluation indicated that increasing the quantity of iron salts influenced the morphology: a single layer was observed at a 2:1 ratio and the combination of layers and particles at 4:1 and 6:1 ratios. At 8:1, there was a recurrence of a layered structure. Magnetite nanoparticles led to the fusion of carbon nanotubes and this was evident from the magnetic characteristic of the fabric. Magnetic properties showed an increasing trend up to the 6:1 ratio (from 0.06 emu/g to 1.00 emu/g) and then decreased at the 8:1 ratio (0.71 emu/g) due to an increase in the number of agglomerations in the solution. These observations were further supported by crystallography analysis of the synthesized magnetite nanoparticles which showed variations in the crystal size. The fabric had better adhesion of carbon nanotubes with increased iron salt content which helped in coating and conductivity. The introduction of these nanostructures also greatly enhanced the heat-resistant properties of the fabrics with the burning length reduced by about 70 % while the photothermal properties of the fabrics reached 81°C. In addition, a significant antibacterial effect was observed in the present study with a minimum of 64 % efficiency under non-irradiated conditions and up to 99 % bacterial killing under irradiated conditions.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"706 ","pages":"Article 135797"},"PeriodicalIF":4.9,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rheological behavior of the stable water-in-oil emulsion associated to water droplets arrangement","authors":"Natan Augusto Vieira Bulgarelli ,&nbsp;Letícia Bizarre ,&nbsp;William Monte Verde ,&nbsp;Andrey Felipe Casas Pulido ,&nbsp;Marcelo Souza de Castro","doi":"10.1016/j.colsurfa.2024.135512","DOIUrl":"10.1016/j.colsurfa.2024.135512","url":null,"abstract":"<div><div>Water-in-oil emulsion is a flow pattern that may occur during the oil production and generate flow assurance issues due to its rheological behavior. In addition to the increase of effective viscosity with water content increment, the emulsion has a complex rheological behavior regarding the fluid’s physicochemical properties, and surfactant presence. In this work, the rheology of stable water-in-oil emulsion formed by the shearing of a multistage centrifugal pump is investigated. The emulsion analyzed was composed of a mineral oil, SPAN 80 and tap water for different water cut and temperatures. The shear rate hysteresis analysis on emulsion flow curve were performed to analyze the rheological behavior. From this analysis, the steady-state shear stress condition was investigated regarding water droplet arrangement based on the Peclet number. Furthermore, the droplet arrangement was observed during acquisition of flow curve using a microscopy coupled on rheometer. To investigate the clustering mechanics in emulsion during rheometry, we present a surface boundary to separate the suspending and clustering droplets based on critical shear stress, droplet Reynolds number, and the water cut for different temperatures.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135512"},"PeriodicalIF":4.9,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}