Littérature scientifique sur le sujet « Bio-Based surfactants »
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Articles de revues sur le sujet "Bio-Based surfactants"
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V, Soni. « The Potential of Biosurfactants in the Pharmaceutical Industry : A Review ». Bioequivalence & ; Bioavailability International Journal 6, no 2 (15 juillet 2022) : 1–15. http://dx.doi.org/10.23880/beba-16000176.
Texte intégralRésumé :
Surface-active substances known as "bio-based surfactants" come from a variety of sources, including plants, animals, microorganisms, marine life, synthetics, and semi-synthetics. Bio-based surfactants have a variety of uses, including in food, personal care, pharmaceutical, and industrial formulations as well as in agricultural and oil field chemicals and institutional and industrial cleaning. Nowadays, there is a significant demand for bio-based surfactants on the market as a result of the strict environmental rules that governments across the globe have placed on the use of toxins in detergents and growing environmental concerns among consumers. Due to their low toxicity and biodegradability, bio-based surfactants are acknowledged as a more environmentally friendly alternative to traditional petrochemical-based surfactants. Additional research going on for the creation of innovative biodegradable surfactants as a result, either by biological processes or from renewable resources (bio-catalysis or fermentation are included). Many such varieties, their properties, clinical assessment of surfactant formulations, use of bio-based surfactants, industrial state-of-the-art, and prospective markets for bio-based surfactants manufacturing are discussed in this paper.
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Haq, Bashirul, Jishan Liu et Keyu Liu. « Green enhanced oil recovery (GEOR) ». APPEA Journal 57, no 1 (2017) : 150. http://dx.doi.org/10.1071/aj16116.
Texte intégralRésumé :
Green enhanced oil recovery (GEOR) is a chemical enhanced oil recovery (EOR) method involving the injection of specific green chemicals (surfactants/alcohols/polymers) that effectively displace oil because of their phase-behaviour properties, which decrease the interfacial tension (IFT) between the displacing liquid and the oil. In this process, the primary displacing liquid slug is a complex chemical system called a micellar solution, containing green surfactants, co-surfactants, oil, electrolytes and water. The surfactant slug is relatively small, typically 10% pore volume (PV). It may be followed by a mobility buffer such as polymer. The total volume of the polymer solution is typically ~1 PV. This study was conducted to examine the effectiveness of the combination of microbial by-products Bacillus subtilise strain JF-2 bio-surfactant and alcohol in recovering residual oil. It also considered whether bio-surfactant capability could be improved by blending it with non-ionic green surfactant. The study consisted of a phase behaviour study, IFT measurement and core-flooding experiments. In the phase behaviour study, it was found that 0.5% alkyl polyglycosides (APG) and 0.5–1.00% of butanol at 2% NaCl gave stable middle phase micro-emulsion. Non-ionic (APG 264) and anionic (bio-surfactant) mixtures are able to form stable middle phase micro-emulsion. Based on IFT reduction, two low concentrations (40 and 60 mg/l) of JF-2 bio-surfactant were identified where IFT values were low. The bio-surfactant and butanol formulation produced a total ~39.3% of oil initially in place (OIIP).
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Huang, Huiyu, Xiaoling Huang, Hongping Quan et Xin Su. « Soybean-Oil-Based CO2-Switchable Surfactants with Multiple Heads ». Molecules 26, no 14 (18 juillet 2021) : 4342. http://dx.doi.org/10.3390/molecules26144342.
Texte intégralRésumé :
Oligomeric surfactants display the novel properties of low surface activity, low critical micellar concentration and enhanced viscosity, but no CO2 switchable oligomeric surfactants have been developed so far. The introduction of CO2 can convert tertiary amine reversibly to quaternary ammonium salt, which causes switchable surface activity. In this study, epoxidized soybean oil was selected as a raw material to synthesize a CO2-responsive oligomeric surfactant. After addition and removal of CO2, the conductivity analyzing proves that the oligomeric surfactant had a good response to CO2 stimulation. The viscosity of the oligomeric surfactant solution increased obviously after sparging CO2, but returned to its initial low viscosity in the absence of CO2. This work is expected to open a new window for the study of bio-based CO2-stimulated oligomeric surfactants.
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Tiwari, Mehul, et Divya Bajpai Tripathy. « Soil Contaminants and Their Removal through Surfactant-Enhanced Soil Remediation : A Comprehensive Review ». Sustainability 15, no 17 (1 septembre 2023) : 13161. http://dx.doi.org/10.3390/su151713161.
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This review provides a comprehensive analysis of the effectiveness of surfactants in enhancing the remediation of contaminated soils. The study examines recent and older research on the use of effluent treatment techniques combined with synthetic surface-active agents, bio-surfactants, and various categories of surfactants for soil reclamation purposes. The main purpose of this review is to evaluate the effectiveness of surfactants in enhancing the remediation of contaminated soils. The research question is to explore the mechanisms through which surfactants enhance soil remediation and to assess the potential benefits and limitations of surfactant-based remediation methods. This review was conducted through an extensive literature search of relevant articles published in scientific databases. The articles were selected based on their relevance to the topic and their methodological rigor. Types of possible soil pollutants and the requirements of specific surfactants were discussed. Structural relationships between pollutant and surfactants were described thoroughly. Extensive study revealed that surfactants have shown great potential in enhancing the remediation of contaminated soils. Surfactants can improve the solubility and mobility of hydrophobic contaminants and facilitate their removal from soil. However, the effectiveness of surfactant-based remediation methods depends on several factors, including the type of contaminant, the soil properties, and the surfactant concentration and type. Surfactant-enhanced soil remediation can be an effective and sustainable method for addressing soil contamination. However, the optimal conditions for using surfactants depend on the specific site characteristics and contaminant properties, and further research is needed to optimize the use of surfactants in soil remediation.
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Popov, Alexey, Irina Ivanova et Eva Dikareva. « Environmental impact and biological activity of bio-based shampoos ». E3S Web of Conferences 420 (2023) : 09016. http://dx.doi.org/10.1051/e3sconf/202342009016.
Texte intégralRésumé :
One of the types of pollution of aquatic and terrestrial ecosystems is pollution by surface-active substances (surfactants).With the awareness of the potential danger of conventional surfactants on the environment and human health, there is a growing interest in the development of bio-based surfactants in personal hygiene products. These substances are considered safer, are abundant, biodegradable, and biocompatible. The study of bio-based surfactants shampoos consisting only of natural organic components is of particular interest. The objective of the research: assessment of the environmental impact and biological activity of bio-based shampoo using standard biotests: germination and growth of black bean plants (Vícia fába) and behavioral reactions of sludge worm (Tubifex tubifex). The chemical composition of bio-based shampoos is analyzed; it is shown that derivatives of natural oils are surfactants, which can serve as a substitute for traditional synthetic detergents. The effect of aqueous shampoo solutions of various concentrations on the biotest of Vícia fába showed an acceleration of biomass growth and its qualitative change, an increase in the amount of chlorophyll and ascorbic acid. Micromorphological method revealed violations at the cellular level of root system development on the 14th day of germination. With the help of a biotest on the behavioral reactions of Tubifex tubifex, the toxic effect was evaluated. Significant biological activity has been established, which, combined with exposure to surfactants, can lead to environmental consequences. It is concluded that the mass replacement of traditional synthetic detergents with bio-organic ones will practically not change the impact on the environment.
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Afifah, Dini Nur, Rahma Falah Maulidina, Novi Astuti et Riska Annisa Wahyadi. « Application of Saponins from Ambon Banana Petiole (Musa paradisiaca var. sapientum L.) as Natural Surfactants in Bio-Hand Soap ». Research In Chemical Engineering (RiCE) 2, no 1 (13 août 2023) : 08–13. http://dx.doi.org/10.30595/rice.v2i1.80.
Texte intégralRésumé :
Surfactants are commonly use as a foaming agents contained in soap products. Consequently, the type of surfactant used is a synthetic product that is difficult to degrade by nature fate. In addition to environmental problems, prolonged use of these products can cause health problems, such as irritation in the form of dry, scaly, itchy skin, to red rashes. Synthetic surfactants used in industry are also petroleum derivatives. This fact makes the sustainability of the industry threatened due to the increasingly critical oil reserves. Based on these problems, it is important to study alternative synthetic surfactants that are more environmentally friendly, safe for health, and abundantly available in nature. In this study, the potential of saponins from the petiole of the Ambon banana (Musa paradisiaca var. sapientum L.) was studied as a natural surfactant in hand soap (bio-hand soap). The purpose of this study was to study the effect of the variable concentration of ethanol solvent and immersion time on the amount of saponin extract yield and the formulation of bio-hand soap. The results showed that the highest extract yield of Ambon banana petiole extract could be achieved using ethanol solvent at a concentration of 80% and a maceration time of 48 hours. Based on the quality tests on bio-hand soap products that have been carried out, formula 1 (20% saponins), 2 (30% saponins), and 3 (40% saponins) have color, shape, anti-bacterial agent, and pH values that are following SNI 2588:2017. The formula that is considered the most optimum for the production of bio-hand soap is Formula 2. This is based on the highest foam stability value, which is 67.56%.
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Duprat-de-Paule, Sébastien, Jérôme Guilbot, Alicia Roso, Sophie Cambos et Aurélie Pierre. « Augmented bio-based lipids for cosmetics ». OCL 25, no 5 (8 août 2018) : D503. http://dx.doi.org/10.1051/ocl/2018036.
Texte intégralRésumé :
Practical examples showcase the key role of plant-based lipids in the design of innovative sustainable specialty ingredients. Great diversity in plant origins and chemical transformations leads to great molecular diversity and explains why bio-based lipids are involved in broad ingredient categories such as biodegradable emollients, environmentally friendly surfactants, rheology modifiers and active ingredients. Choosing lipid structure, with varying fatty chain length, saturation level and branching, determines ingredient functionality and usage, as these vary, for instance in the case of surfactants, solubilizing, wetting, foaming and emulsifying properties (oil-in-water or water-in-oil). The lipid structure also impacts the ingredients’ final solid or liquid appearance. Now ready-to-use ingredients can be created and we can innovate with cold processable new cosmetic formulation concepts. Perhaps most importantly, optimal selection of lipid structure and composition can also drive consumer benefits in cosmetic ingredients, especially, the final sensory experience (for excipients) and biological efficacy (for active ingredients). Bio-based lipids lead to new ingredients with augmented performance and sensoriality.
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Patil, Harshal, et Ashok Athalye. « Sustainable Enzymatic Desizing of Cotton with Bio-surfactant Extracted from Soapnut ». Textile & ; Leather Review 7 (27 février 2024) : 327–39. http://dx.doi.org/10.31881/tlr.2024.007.
Texte intégralRésumé :
Surfactant is one of the major consuming auxiliaries in textile processing. The rising demand for petroleum-based surfactants is in focus and it is tremendously utilized to fulfil the need for surfactants in textile industries. These petroleum-based surfactants are one of the major pollutants of textile wastewater. Many attempts have been made to replace this with low toxicity to make the process sustainable. The present investigation works on the same objective to replace the petroleum-based surfactant from desizing by using soapnut extract as a wetting agent. The process was optimised by using a modern statistical technique of Response Surface Methodology [RSM]. The initial designing was conducted using 10 g/l soapnut extract and 2% enzyme for 30 min at 75 °C and found satisfactory results. Additional desizing experiments were performed to optimize the process using RSM with weight loss as the primary outcome. An optimised desizing recipe provided by DOE numerical optimisation, viz., a concentration of 10 g/l soapnut extract and 2% enzyme at 75 °C for 40 min, was performed to validate. The findings demonstrate that optimum weight loss (6.58%) and desirable levels of absorbency (14 s), whiteness (73.52), yellowness (22.84 indices, bending length (2.1 cm), Flexural rigidity (98.13 mg.cm), while minimally affecting tensile strength (10.77). Enzymatic desizing with synthetic or soapnut-extracted wetting agents yields identical results and satisfies performance standards for industrial use. The Sustainable way of enzymatic desizing of cotton with bio-surfactant extracted from soapnut may be the green alternative to synthetic surfactant-based desizing.
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Mudge, Stephen M., Juergen Tropsch, Thierry Beaudouin, Christophe Séné et Horacio Hormazabal. « Determining the Bio‐Based Carbon Content of Surfactants ». Journal of Surfactants and Detergents 23, no 4 (28 avril 2020) : 771–80. http://dx.doi.org/10.1002/jsde.12411.
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Wibowo, Agam Duma Kalista, Rizki Megawati, Vilia Kartika Setyaningrum, Erika Wahyu Putri, Joelianingsih, Aniek Sri Handayani, Maharani Dewi Solikhah et Achmad Chafidz. « Investigating potential application of bio-based polymeric surfactant using methyl ester from palm oil for chemical enhanced oil recovery (CEOR) ». Communications in Science and Technology 8, no 2 (31 décembre 2023) : 235–42. http://dx.doi.org/10.21924/cst.8.2.2023.1318.
Texte intégralRésumé :
Fatty Acid Methyl Ester (FAME) or palm oil methyl ester is one of the palm oil derivatives in which one of the anionic surfactants that can be generated from it is methyl ester sulfonate (MES). This bio-based surfactant can reduce the interfacial tension (IFT) between oil and water. To produce a bio-based polymeric surfactant, sulfonate groups from MES were grafted onto polymer chains. Palm oil methyl ester was reacted with sulfuric acid (H2SO4) to synthesize MES. Afterwards, MES was reacted with the Ethyl Acrylate (EA) monomer to synthesize polymeric surfactant. Investigating this route to produce a bio-based polymeric surfactant has become the novelty of this study. This study showed that the best polymerization result was obtained at a mole ratio of MES to EA (1:0.5) with the highest viscosity of 14.47 mm2/s. The critical micelle concentration (CMC) analysis showed 0.5% at a mole ratio of MES to EA (1:0.5) which corresponded to the lowest interfacial tension (IFT) of 1.95 x 10-3 mN/m. Meanwhile, the contact angle gradually decreased from 58.44 to 11.79°. The polymeric surfactant, furthermore, was analyzed using FTIR and H-NMR and successfully confirmed the formation of bio-based polymeric surfactant. The core flooding experiment found that approximately 16.57% of oil could be recovered. The results of the study revealed a good potential of the polymeric surfactant to be applied in chemical enhanced oil recovery (CEOR).
Thèses sur le sujet "Bio-Based surfactants"
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FORNASIER, MARCO. « Bio-surfactants-based lipid architectures as nanomedicine platforms ». Doctoral thesis, Università degli Studi di Cagliari, 2021. http://hdl.handle.net/11584/306899.
Texte intégralRésumé :
The use of nanocarriers for drug delivery and imaging purposes have highly increased in the last decades. Both hard and soft matter-based formulations can provide selective and efficient treatment in several administration routes. Indeed, the biocompatibility and the biodegradability of the formulations represent a key requirement in order to translate the in vitro studies into in vivo investigations. Therefore, lipids are a safe choice as building blocks to formulate a large variety of liquid crystalline architectures in water.
Vesicles, hexosomes and cubosomes have been adopted as nanomedicine platforms providing excellent biological performances. However, several drawbacks may impact the application of these carriers: the poor stability in the physiological environment and the biodegradability of the stabilizing agent required to sterically stabilized the nanoparticles (NPs) are few examples.
Given the importance these materials have acquired nowadays in the nanomedicine field, this thesis is devoted to investigating on the factors that can enhance the physico-chemical and biological performances of these nanoparticles for systemic and topical administration. Most of the formulations presented in this thesis were prepared using monoolein as building block, given its biocompatibility and lower cytotoxicity in comparison with other surfactants. However, the potential application of cell-derived nanoparticles known as nanoerythrosomes for medical imaging was also explored. Therefore, the thesis evaluated different approaches:
(i) evaluation of the effect of various stabilizers (modified poloxamers, hemicellulose and polyphosphoesters) on monoolein-based cubosomes features, in order to formulate nanoparticles suitable for systemic administration. This investigation was focused on the physico-chemical (bulk and surface) characterization of the empty carriers and of those loaded with antioxidants or fluorophores suitable for in vitro imaging. Bioassays (viability and uptake experiments) were conducted in order to evaluate the biological performance of the differently stabilized cubosomes.
(ii) the effect of permeation enhancers and edge activators on monoolein-based vesicles and hexosomes for topical administration. In vitro permeation tests were performed to show the efficacy of these carriers into overcoming the stratum corneum, the first layer of the skin, to deliver antioxidants.
(iii) the potential role of nanoparticles derived from red blood cells, nanoerythrosomes, as personal medicine for application in optical imaging. Cross-linking and Click Chemistry were employed to decorate the surface of the nanoparticles and their emission properties in a physiological buffer were evaluate.
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Dari, Carolina. « New innovative methods for cleaning surfaces using foams based on bio-based surfactants ». Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILR038.
Texte intégralRésumé :
Dans l'industrie alimentaire, les surfaces contaminées par des micro-organismes sont une cause majeure de contamination croisée, entraînant des maladies d'origine alimentaire et du gaspillage alimentaire. Malgré des efforts de nettoyage rigoureux, les taux de maladies d'origine alimentaire augmentent, ce qui suggère que les pratiques actuelles sont insuffisantes. Les méthodes de nettoyage traditionnelles consomment également de grandes quantités d'eau, d'énergie et de produits chimiques, soulevant des préoccupations en matière de durabilité et d'environnement. L'industrie explore des alternatives plus durables, telles que les méthodes de nettoyage à sec, les produits écologiques et les systèmes de contrôle avancés, pour réduire la consommation de ressources tout en maintenant les normes d'hygiène. Une alternative prometteuse pour le nettoyage des surfaces fermées est l'utilisation de la mousse, une méthode déjà utilisée pour les surfaces ouvertes. Le nettoyage avec de la mousse peut potentiellement réduire la consommation d'eau, d'énergie et de produits chimiques. L'objectif de cette thèse est d'étudier les liens entre les propriétés de la mousse et l'élimination de micro-organismes sur des surfaces ouvertes et fermées, et d'explorer des techniques de nettoyage innovantes afin de développer des méthodes plus durables et efficaces pour l'industrie alimentaire.La première partie est consacrée au nettoyage des surfaces ouvertes, c'est-à-dire au nettoyage par de la mousse en condition statique. Nous étudions ici l'élimination des spores hydrophiles et hydrophobes de Bacillus subtilis des surfaces en acier inoxydable en utilisant des mousses. Les mousses modèles sont formulées avec des tensioactifs biosourcés (acide 10-hydroxystéarique et cocoyl iséthionate de sodium). La relation entre la taille des bulles et la fraction liquide de la mousse et l'efficacité de la décontamination est étudiée pour déterminer les mécanismes d'action de la mousse. Les mousses elles-mêmes peuvent décontaminer les surfaces souillées par des spores, très probablement par des mécanismes de frottement/balayage et d'imbibition. Les mousses avec des bulles plus petites ont la plus grande efficacité de décontamination. Dans les conditions étudiées, la fraction liquide n'est pas le principal paramètre gouvernant l'efficacité de la décontamination.La deuxième partie est consacrée au nettoyage des surfaces fermées, c'est-à-dire au nettoyage par écoulement de mousse. Nous étudions ici l'efficacité de l'écoulement de mousse formulée avec un tensioactif modèle (dodecyl sulfate de sodium) en comparaison avec l'écoulement de mousse formulée avec des tensioactifs biosourcés (alkyl polyglycosides) pour éliminer les spores hydrophiles des tuyaux. Nous démontrons une efficacité similaire pour des temps de nettoyage courts. De plus, grâce à une évaluation du cycle de vie, nous démontrons la réduction de plusieurs impacts environnementaux avec l'utilisation de surfactants biosourcés par rapport au surfactant modèle.La troisième partie est consacrée à la stabilisation des émulsions eau-dans-eau et à la production d'une mousse basée sur ces émulsions. Nous étudions la stabilisation des émulsions PEG-dans-Dextran avec des réseaux de gel lamellaire basés sur des alkylpolyglycosides et des alcools gras. Nous montrons que des émulsions très stables sont obtenues sur une longue période pour des conditions de formulation spécifiques. Nous démontrons également pour la première fois la production d'une mousse basée sur des émulsions eau-dans-eauIn the food industry, surfaces contaminated with microorganisms are a major cause of cross-contamination, resulting in foodborne illness and food waste. Despite thorough cleaning efforts, foodborne illness rates are rising, suggesting current practices are insufficient. Traditional cleaning methods also consume large amounts of water, energy, and chemicals, raising sustainability and environmental concerns. The industry is exploring more sustainable alternatives, such as dry-cleaning methods, eco-friendly products, and advanced control systems, to reduce resource consumption while maintaining hygiene standards. One promising alternative for cleaning closed surfaces is the use of foam, a method already used for open surfaces. Foam cleaning can potentiallyreduce water, energy, and chemical consumption. The aim of this thesis is to study the links between foam properties and removal of microorganisms from both open and closed surfaces, and explores innovative cleaning techniques to develop more sustainable and efficient methods for the food industry.The first part is dedicated to the cleaning of open surfaces, i.e., static foam cleaning. Here we study the removal of hydrophilic and hydrophobic Bacillus subtilis spores from stainless steel surfaces by using foams. The model foams are formulated with bio-based surfactants (10-hydroxystearic acid and sodium cocoyl isethionate). The relationship between bubbles size and foam liquid fraction and the decontamination efficiency is investigated to determine the mechanisms of foam action. Foams themselves can decontaminate surface soiled with spores, most probably by wiping and imbibition mechanisms. Foams with smaller bubbles size have the highestdecontamination efficiency. Under the conditions studied, the liquid fraction is not the main parameter governing the decontamination efficiency.The second part is dedicated to the cleaning of closed surfaces, i.e., foam flow cleaning. Here we study the efficiency of foam flow formulated with a model surfactant (Sodium dodecyl sulfate) in comparison with foam flow formulated with bio-based surfactants (alkyl polyglucosides) to remove hydrophilic spores from pipes. We demonstrate similar efficiency for short cleaning times). In addition, through a life cycle assessment we demonstrate the reduction of several environmental impacts with the use of bio-based surfactant compared to the model surfactant.The third part is dedicated to the stabilization of water-in-water emulsions and the production of a foamulsion based ont these emulsions. We study the stabilization of PEG-in-Dextran emulsions with lamellar gel networks based on alkyl polyglucosides and fatty alcohols. We show that highly stable emulsions are obtained over a long period of time for specific formulation conditions. We also demonstrate for the first time the production of a foamulsion based on water-in-water emulsions
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Faßbach, Thiemo A. [Verfasser]. « Bio-based Surfactants by Homogeneous Catalysis – Approaches to Process Development / Thiemo A. Faßbach ». München : Verlag Dr. Hut, 2018. http://d-nb.info/1164293834/34.
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Hibert, Geoffrey. « Glycolipids : from synthesis and self-assembly studies to the design of original bio-based polymers ». Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0249/document.
Texte intégralRésumé :
Ces travaux de thèse traitent de l’étude de glycolipides et plus précisément d’esters de trehalose pour la synthèse de nouveaux polymères bio-sourcés. Des monoesters et diesters de trehalose ont ainsi été synthétisés par estérification des alcools primaires du trehalose avec des acides gras selon deux voies de synthèse. La première utilisant un agent de couplage peptidique ne nécessite pas l’utilisation de groupement protecteur pour estérifier sélectivement les alcools primaires. La deuxième est une estérification sélective catalysée par une lipase. L’auto-assemblage des esters de tréhalose a ensuite été étudié. Les monoesters possèdent des propriétés tensio-actives dans l’eau et le trehalose monoeruçate a la capacité de gélifier l’eau. Les diesters, quant à eux sont de bons gélifiants pour les solvants organiques etles huiles végétales. Par conséquent, des gels ont été préparés dans trois huiles végétales, puis leur morphologie et leur propriété rhéologique ont été étudiées. Ensuite, les diesters ont été fonctionnalisé et polymérisés selon différentes stratégies. Ainsi, des polyuréthanes et des poly(hydroxyuréthane)s ont été synthétisés par polycondensation tandis que des glycopolyesters ont été obtenus par polymérisation par métathèse et addition thiol-ène. Finalement,les propriétés d’auto-assemblage de ces polymères ont été étudiées. Ces derniers peuvent former des nanoparticules par la méthode de déplacement de solvantsThe aim of this thesis was to study glycolipids and particularly trehalose esters for the synthesis of new bio-sourced polymers. Trehalose monoesters and diesters were synthesized by two esterification pathways of the primary alcohol of trehalose with different fatty acids. The first synthetic route is a protective group-free esterification using a peptide coupling agent and the second one is a lipase-catalyzed esterification. The self-assembly properties of the trehalose esters were investigated. Trehalose monoesters showed surfactant properties in water and trehalose monoerucate was even able to form gels in water. The trehalose diesters appeared to be good gelators for organic solvent and vegetable oil. Thus, gels in three vegetable oils were prepared and their morphology and rheological properties were studied. Afterwards, trehalose diesters were functionalized and polymerized with different strategies.Thus, polyurethanes and poly(hydroxyurethane)s were obtained by polycondensation where as glyco-polyesters were synthesized by acyclic diene metathesis (ADMET) and thiol-enepolymerization. Finally, the self-assembly properties of these polymers were investigated. The latter were able to form some nanoparticles by solvent displacement method
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Chemin, Maud. « Valorisation des xylanes du bois : vers la synthèse de copolymères amphiphiles bio-sourcés ». Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0302/document.
Texte intégralRésumé :
La thèse présentée propose une nouvelle voie de valorisation des xylanes du bois par l’élaboration de nouveaux polymères bio-sourcés et amphiphiles.Après une caractérisation complète de xylanes issus du bois de hêtre, l’hydrolyse acide en milieu dilué a été optimisée afin d’obtenir des xylo-oligosaccharides d’environ 6 unités xylose par chaîne avec une seule unité acide méthylglucuronique positionnée à l’extrémité non réductrice de la chaîne. En parallèle, l’étude de l’oxydation au periodate de sodium de ces xylanes a été effectuée pour permettre l’introduction d’un nombre contrôlé de fonctions aldéhyde le long de la chaîne. La fonction aldéhyde de l’extrémité réductrice des oligomères de xylane a ensuite été fonctionnalisée par un groupement allyle ou azoture pour permettre leur couplage à des dérivés d’acide gras par ‘chimie click’.Les oligomères amphiphiles ainsi obtenus ont ensuite été étudiés pour leurs propriétés tensioactives et d’auto-assemblage. Ils présentent de bonnes propriétés de mouillage, comparables à celles du Tween®80. Les objets issus de l’auto-assemblage de ces oligomères amphiphiles ont été analysés par DLS et TEM. Ils s’auto-assemblent aussi bien dans le chloroforme que dans l’eau. Les objets formés sont sphériques et de taille micellaire (d ≤ 50 nm). Ces objets ont tendance à s’associer pour former des agrégats, surtout dans le chloroforme. Ces agrégats sont régis par des interactions assez faibles pour être éliminés par dilution. Ils peuvent également être éliminés par simple filtration.Finalement, ce travail de thèse aura abouti à la synthèse de composés amphiphiles totalement bio-sourcés, à partir de xylanes, coproduits potentiels de l’industrie papetière. Grâce à leurs propriétés tensioactives, les applications envisageables pour ces tensioactifs ‘verts’ sont nombreuses. De plus, leur caractère biocompatible et leur auto-assemblage en solution aqueuse en font de bons candidats pour l’encapsulation et la vectorisation de principes actifsThis thesis work aims to add value to xylans by designing new bio-based amphiphilic polymers.Beechwood xylans were first fully characterized before their acidic hydrolysis. The hydrolysis conditions were optimized in order to obtain well-defined xylooligosaccharides, oligomeric chains of about six xylose units that have only one methylglucuronic acid unit positioned at the non-reductive chain end. Periodate oxidation of xylans was also studied in order to form new aldehyde groups within the xylan backbone in a controlled manner. The xylooligomers were then functionalized from their reductive end with an azide or an allyl group, providing the ability to couple these oligomers to fatty acid derivatives using ‘click chemistry’.The obtained amphiphilic oligomers were finally studied according to their surfactant and self-assembly properties. Their wetting properties were found to be very good, comparable to those found with Tween®80. Moreover, they self-assembled in both chloroform and water, where their structures were characterized via DLS and TEM. The resulting particles formed had a spherical micellar morphology, with a d ≤ 50 nm. However, it was found that the particles had a tendency to form large aggregates, particularly in chloroform. The aggregates could be easily removed, either by filtration or by dilution of the sample, as the forces that govern the aggregation are low enough to allow dissociation with increasing solvent volume.As previously mentioned, this thesis work led to the synthesis of bio-based amphiphilic oligomers starting from xylans, which are a potential byproduct in the paper/pulp industry. Thanks to their surfactant properties, numerous applications can be found for such a ‘green’ surfactant. Their biocompatibility added with their self-assembly nature in aqueous media makes them an attractive molecule for active substance delivery applications
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Lu, Biao. « Evaluation of physico-chemical properties of biorefinery-derived amphiphilic molecules and their effects on multi-scale biological models ». Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2218/document.
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Aujourd'hui, un grand nombre de nouvelles molécules peuvent être synthétisées à partir de la biomasse. Les tensioactifs dérivés de sucre sont notamment considérés comme une alternative aux tensioactifs fossiles en raison de leur biodégradabilité et de leur biocompatibilité. Cependant, les études associant la caractérisation physico-chimique et les propriétés biologiques de ce type de tensio-actifs sont limitées. Il est ainsi difficile de prédire les propriétés d'un tensioactif à partir de sa structure chimique. L'établissement d'une méthodologie permettant de relier la structure des surfactants à leurs propriétés apparait pertinent. Dans ce travail, quatre surfactants dérivés de sucre ayant chacun une chaîne C8 liée à une tête glucose ou maltose par un groupe amide ont été caractérisés par leurs propriétés tensio-actives dans différentes solutions (eau et milieu biologique). Leurs interactions avec des protéines ont également été analysées. Concernant l'évaluation des propriétés biologiques, des tests de cytotoxicité/irritation ont été effectués sur trois modèles in-vitro : 1) modèle cellulaire 20 (cellules L929 cultivées en monocouche), Il) modèle cellulaire 30 (cellules L929 cultivées dans un gel de collagène), Ill) épiderme humain reconstitué. Les résultats indiquent que les quatre surfactants synthétisés présentent de bonnes propriétés tensio-actives et trois d'entre eux sont moins cytotoxiques que des tensioactifs de référence. Plusieurs hypothèses permettant de relier la structure chimique des molécules à leurs propriétés physico-chimiques et biologiques ont été proposées. Des travaux futurs permettront d'enrichir la base de données sur les relations structure-propriétés des tensioactifs issus de la biomasse, et de l'utiliser pour synthétiser des surfactants présentant des propriétés adaptées aux applications envisagéesNowadays, a wide variety of new molecules can derive from biomass. Among them, the family of sugar-based surfactants, which are considered as alternatives to fossil-based surfactants, due to their relatively high biodegradability and biocompatibility, exhibit interesting properties both in terms of their self-assembly and their ability to induce biological responses. In the study, for the purpose to analyse these properties, different methodologies have been established. In this work, physico-chemistry and cellular biology methodologies are associated to analyse the properties of pre-selected molecules characterized by gradua) structure modifications. Firstly, we have screened synthesized sugar-based surfactants according to their solubility and their ability to reduce surface tension of water. Four pre-selected molecules, with a C8 chain linked to a glucose or maltose head through an amide functional group, either under the form of carbamoyl (carbohydrate scaffold bearing the carbonyl) or alkylcarboxamide (the alkyl chain bearing the carbonyl), were then dissolved in water/ cell culture media for surface tension measurements. Their behaviors in solutions were characterized by Krafft points, Critical Micellar Concentrations or self-assembling properties through different methods. To evaluate the cytotoxic/ irritant effects of these molecules on cells and tissues, 3 in-vitro models were established: I) 2D cell culture mode! (L929 cell monolayer) II) 3D ce!! culture mode! (L929 cells embedded in collagen gel) and III) Reconstituted human epidermis (differentiated human keratinocytes). Corresponding experiments were carried out on these models with increasing complexity. Results show that the synthesized sugar-based surfactants, GlulamideC8, Glu6amideC8, Glu6amideC8' and MallamideC8 can reduce the surface tension of water solution to the came level as standard surfactants (Tween 20 and Hecameg). In the meantime, GlulamideC8, Glu6amideC8' and MallamideC8 present Iess cytotoxicity effects on L929 cells both in the monolayer model and the 3D mode! than Tween 20 and Hecameg. All synthesized and standard surfactants (GlulamideC8, Glu6amideC8, Gu6amideC8', MallamideC8, Tween 20 and Hecameg) have no significant cytotoxic/ irritant effects on reconstituted human epidermis at 1000 ig/mL after 48 h of topical application. Discussions have been made according to the results of experiments to establish possible structures/ physico-chemical properties - cytotoxicity relationships of these surfactants
Chapitres de livres sur le sujet "Bio-Based surfactants"
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Wang, Lianjie, et Yves Queneau. « Carbohydrate-Based Amphiphiles : Resource for Bio-based Surfactants ». Dans Green Chemistry and Chemical Engineering, 349–83. New York, NY : Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9060-3_1009.
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Wang, Lianjie, et Yves Queneau. « Carbohydrate-Based Amphiphiles : Resource for Bio-based Surfactants ». Dans Encyclopedia of Sustainability Science and Technology, 1–35. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-2493-6_1009-1.
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Hayes, Douglas G. « Bioprocessing Approaches to Synthesize Bio-based Surfactants and Detergents ». Dans Food and Industrial Bioproducts and Bioprocessing, 243–66. Oxford, UK : Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781119946083.ch10.
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Husin, Hazlina, Muhammad Najmi Ibrahim, Zulkafli Hassan, Norrulhuda Mohd Taib, Ku Halim Ku Hamid, Nik Khairul Irfan Nik Ab Lah et Muhammad Shafiq Shayuti. « Overview on Chemical-Based, Bio-based and Natural-Based Surfactants in EOR Applications ». Dans ICGSCE 2014, 3–9. Singapore : Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-505-1_1.
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Benavides, Laura. « Using Bio-Based Surfactants as Frothers in Froth Flotation to Improve Renewable Carbon Index ». Dans Proceedings of the 61st Conference of Metallurgists, COM 2022, 907–9. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17425-4_101.
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Lakshmipraba, J., et Rupesh N. Prabhu. « Deep Eutectic Solvents, Bio-Based Solvents, and Surfactant for Green Sample Pretreatment and Determination ». Dans Green Chemical Analysis and Sample Preparations, 353–78. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96534-1_9.
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Ali, Mohamed Asyraf Mahboob, Azwan Iskandar Azmi, Mohd Zahiruddin Mohd Zain, Muhammad Nasir Murad et Ahmad Nabil Mohd Khalil. « Effects of Surfactant Concentration in the New Bio-based Nanolubricants for Machining of Inconel 718 ». Dans Lecture Notes in Mechanical Engineering, 291–98. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0866-7_24.
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Narayanan, Kolazi S., Xuejun Liu et Xin Qu. « Formulation Matrices Using Polymer Surfactant Interaction to Formulate Water-Based Compositions and Additives to Provide Enhanced Bio-Activity ». Dans Pesticide Formulation and Delivery Systems : 33rd Volume, “Sustainability : Contributions from Formulation Technology”, 71–86. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 2014. http://dx.doi.org/10.1520/stp156920120124.
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Liyana Ismail, Nur, Sara Shahruddin et Jofry Othman. « Overview of Bio-Based Surfactant : Recent Development, Industrial Challenge, and Future Outlook ». Dans Surfactants [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100542.
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Bio-based surfactants are surface-active compounds derived from oil and fats through the production of oleochemicals or from sugar. Various applications of bio-based surfactants include household detergents, personal care, agricultural chemicals, oilfield chemicals, industrial and institutional cleaning, and others. Due to the stringent environmental regulations imposed by governments around the world on the use of chemicals in detergents, as well as growing consumer awareness of environmental concerns, there has been a strong demand in the market for bio-based surfactants. Bio-based surfactants are recognized as a greener alternative to conventional petrochemical-based surfactants because of their biodegradability and low toxicity. As a result, more research is being done on producing novel biodegradable surfactants, either from renewable resources or through biological processes (bio-catalysis or fermentation). This chapter discusses the various types, feedstocks, and applications of bio-based surfactants, as well as the industrial state-of-the-art and market prospects for bio-based surfactant production. In addition, relevant technological challenges in this field are addressed, and a way forward is proposed.
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Chauhan, Priya, G. Madhavi et Veera Manohara Reddy Yenugu. « Surfactant Sensors for Bio-based Sensing ». Dans Surfactant-based Sensors in Chemical and Biochemical Detection, 40–64. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837671182-00040.
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Anionic surfactants are important components of many products used in everyday life in all households. They are also applied in various industrial fields at a very large scale. The latest development in the use of new ionophores has been presented here. Special attention has been given in this chapter to electrochemical surfactant sensors. The importance of surfactants in modern science is stressed. Electrochemical sensors are usually divided according to the measured physical quantity into potentiometric, amperometric, conductometric and impedimetric surfactant sensors. Potentiometric surfactant sensors are the most numerous due to their simplicity and versatility. They can be used either as end-point titration sensors or as direct EMF measurement sensors, in batch or flow-through mode. Some amperometric surfactant sensors are true biosensors that use microorganisms or living cells.
Actes de conférences sur le sujet "Bio-Based surfactants"
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Ma, Qisheng, Wenjie Xia, Yongchun Tang, Mohamed Haroun, Md Motiur Rahman, Muhammad Gibrata, Lamia Rouis et al. « Novel Nano and Bio-Based Surfactant Formulation for Hybrid Enhanced Oil Recovery Technologies ». Dans SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206288-ms.
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Abstract This investigation presents laboratory and field deployment results that demonstrate the potential candidacy utilizing Nano and bio-technologies to create superior chemicals for novel applications to increase oil recovery from both onshore and offshore reservoirs. Nano-technology is gaining momentum as a tool to improve performance in multiple industries, and has shown significant potential to enhance hydrocarbon production. The laboratory analysis and specifically designed coreflood results indicate there are beneficial interactions at liquid-nano solid interface that increase oil mobility. This will increase the surface activity of chemical surfactants and thereby make them the dominant agents to mobilize and recover oil from oil-bearing reservoirs. Advances in biotechnology offer another rich resource of knowledge for surface active materials that are renewable and more environmental-friendly. In addition, our studies also demonstrate that bio-surfactants are well-suited to provide superior performances in enhancing oil recovery. Nano-particles and biosurfactants may be included with synthetic surfactants to create novel and more efficient surface active agents for enhanced oil recovery. These formulations can promote better flow back of the injected stimulation fluids and additional mobilization to extract more oil from the matrix and micro-fractures. Laboratory experiments demonstrate that the specialized surfactant formulations created, interact with mixed or oil-wet low permeability formations to produce additional oil. Furthermore, this investigation also compares the total production on a candidate field with respect to typical water flood and the novel formulated surfactant approach. For each surfactant treatment, the overall designed injected fluid volume is 1500 m3 (~ 396,000 gallons) with 4 gpt (gallon per thousand unit) of surfactant concentration. Results indicate improved oil production with longer exposure time of the key surfactants within the reservoir. Enhanced surface wetting and super-low interfacial tension (IFT) at lower chemical concentrations are recognized to be the main mechanisms. The novel surfactant also shows stronger sustainability and endurance in keeping rock surface wettability over traditional surfactant system up to 5 times for an 8 PV wash. Furthermore, this can assist to identify and initiate the optimization of the identified mechanisms for potential applications within other compatible reservoirs. A number of successful field applications of EOR with special formulated nano and bio-based surfactant formulation are discussed in this paper. This unique study bridges the gap between the field realized results and lab optimization to enhance feasibility as a function of time and cost.
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Jin, Julia, Lin Zuo, Gayani Pinnawala, Harold Linnemeyer, Christopher Griffith, Jimin Zhou et Taimur Malik. « Development of Bio-Based Surfactant Foams for Hydrocarbon Gas Disposal Applications ». Dans SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209386-ms.
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Abstract There has been increasing interest in different greenhouse gas (GHG) management strategies including the reduction of methane emissions and carbon sequestration. It has been proposed that reinjection of excess produced natural gas can mitigate GHG emissions without compromising oil production. Foam has been used as a method to reduce gas mobility, delay gas breakthrough, and improve sweep efficiency. However, industrial production of petroleum-based chemicals or surfactants to generate foam can be dependent on fossil-based resources that can be scarce or expensive. The main objective of this work was to reduce chemical cost and oil-based chemical dependency by developing an alternative biosurfactant formulation to generate high quality foam. Biosurfactant blends were ranked in comparison to single component anionic and nonionic surfactants and other commercially available surfactant blends. Bulk stability "shake tests" were done to look at initial foamability and stability of the different candidates and then corefloods in sandpacks and surrogate rocks were completed to look at if formulations would generate foam in porous media with methane gas and in the presence of crude oil. Experiments showed success in replicating chemical performance by replacing traditional oil-based surfactants with bio-based lignin derived surfactants even at reservoir conditions. High-quality biosurfactant foams reduced chemical costs, provided an alternative method to dispose of large amounts of hydrocarbon gas, and improved oil recovery through foam displacement.
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Mortada, Nourhan, Annabelle Phelipot-Mardele et Christophe Lanos. « Impact of Biobased Surfactants on Hygrothermal Behaviour of Gypsum Foams ». Dans 4th International Conference on Bio-Based Building Materials. Switzerland : Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.715.
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Reduce the impact of the building sector has become a key point of sustainable development. The production of lightweight materials for the building industry is therefore a must. To produce such materials, foaming is a process commonly used to trap air bubbles and achieve a range of low densities. A sufficient low thermal conductivity and an acceptable ability to regulate humidity variations in order to limit overall energy consumption are the sought properties. In this study, a direct foaming method is applied to formulate gypsum foams using a commercial Plaster and two biobased foaming agents based on proteins. An anionic surfactant (α-olefin sulphonate sodium salt) is used as a reference surfactant. Varying the mixing time, protein content and water content, gypsum foams were produced. The foam volume is measured continuously during the mixing step and the foam homogeneity is controlled. The densities of fresh foams and of the hardened foams are used to identify the links between formulation and foams properties. Gypsum foam specimens with different densities ranging from 300 to 750 kg/m3 are produced. The thermal conductivity and the Moisture Buffer Value measurements are performed. Such properties appear directly linked to the porosity and pore connection of the foams. The obtained results highlight the contribution of biobased surfactant to the performance of gypsum foams.
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Sheikh, Yahya, Mohamed Gadalla, Muhammed Umair, Elmehaisi Mehaisi et Ahmed Azmeer. « Effect of Adding Graphene Nano-Platelets With Surfactants on Bio-Based PCM Characteristics and its Cooling Performance ». Dans ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24373.
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Abstract Phase change materials (PCM) are materials that absorb/release large amounts of thermal energy at constant temperatures during phase change. Consequently, PCMs could be effective when electronic cooling systems such as heat sinks and heat pipes are considered. In the selection of PCMs for cooling systems, bio-based PCMs are more effective when compared to inorganic PCM. However, bio-based PCMs have poor thermal conductivity and therefore suffer from poor heat transfer characteristics. The diffusion of certain additives within the PCM has proven successful in the enhancement of heat transfer during the cooling process. Graphene Nanoplatelets (GNPs) presents itself as one such additive. Using PureTemp PCM as a heat sink for an electric heater, this paper experimentally investigates the cooling performance of the heat sink when GnPs and various surfactants such as, SDS, SDBS and SSL, are added to the bio-based PCM. Finally, results indicate that the addition of GnPs increased the time taken for the heater to reach a reference temperature of 43 °C by nearly 12% when compared to PurePCM heat sink, indicating an improved cooling performance of the PCM heat sink when GnP’s were added. Furthermore, the experiment indicated that SSL surfactant showed a 9% increase in time taken to reach the reference temperature when compared to other surfactants. SDS surfactant indicated the highest increase in thermal conductivity when compared to other surfactants as it reported the highest increase of 147% when compared with the thermal conductivity of PurePCM.
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Company, Roberto, Sabrina Hocine, Baptiste Pousset et Mikel Morvan. « Understanding the Impact of Brine Hardness on Chemical Enhanced Oil Recovery Surfactants Performance : A Data Journey ». Dans Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207685-ms.
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Abstract Brine composition is one of the key parameters in the design of a surfactant based oil recovery process and is a condition imposed by the reservoir nature. This brine can contain a large variety of ions including monovalent and divalent cations (hardness), which impacts the surfactants solubility. Moreover, hardness evolution during the injection process can also impair surfactant formulations’ performances. Water treatment processes are useful ways to mitigate such risks, but they imply higher CAPEX for the process. As a consequence, the selection of the right surfactant will have a large impact on the cost and on crude oil production. This paper describes solution properties of the most common surfactants used in surfactant flooding i.e. Alkyl Benzene Sulfonates (ABS) and Internal Olefin Sulfonates (IOS) as a function of the brine hardness and will be compared with Internal Ketone Sulfonates (IKS), a new bio-based surfactant family.
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Ogunyemi, A. T., T. D. Eluwa, A. A. Adeyi, A. Giwa, A. I. Igbafe et A. O. Gbadamosi. « Enhanced Oil Recovery Using Novel Bio-Based Surfactant Synthesized from Algae ». Dans SPE Nigeria Annual International Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/221609-ms.
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Abstract Cost of conventional surfactants coupled with decreasing oil prices and increasing recovery has led to the search and quest for more low-cost yet effective methods and techniques to recover residual and heavy oil in the reservoir. More research has been steered towards environmental-friendly and fluids with low toxicity to be used in tertiary recovery of oil. Oil extracted from algae has been seen to have a promising yield for biodiesel bio-based surfactant production, hence the need to find its potentials in EOR. The aim of this study was to formulate an algae-based Methyl Ester Sulfonate (MES) and to find its effectiveness in lowering surface tension between rock matrix and oil and application in core flood process. The produced MES was analyzed using Fourier Transform Infrared Spectroscopy and it showed that the absorption peaked in the presence of single chained alkane stretch bond (C-H stretching alkane) with wavenumber and transmittance of 2918.39 cm-1 and 18.77 % respectively and presence of sulfonate group that indicates the surfactant is a methyl ester sulfonate. The CMC value of the surfactant was seen to be 1.24 and an IFT reduction from 28 to 5.1mN/m with a decrease of 81.8%. In the core flood process, at the end of the surfactant flooding, the novel surfactant was able to displace residual oil from the two cores with efficiencies of 35.9% and 41.8%.
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Drochomirecki, Jakub Mateusz. « Application of Bio and Biobased Surfactants as Demulsifiers for Destabilization of Water in Crude Oil Emulsions ». Dans SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/217482-stu.
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Abstract A process of breaking ‘water in oil’ type of emulsions by using demulsifiers based on bio and biobased surfactants and comparison of their effectiveness with commercial demulsifier presented by creation of: five bio demulsifiers, ‘water in oil’ type emulsion and conduction of the analyze of: the impact of those agents on process of emulsion breaking by using the thermochemical method and comparison it with effectiveness of commercial one and an optimal doze of active compound in demulsifier which allows to effectively break emulsion. Testing set consists of: Oil samples from ‘Jaszczew’ field with different dozes of demulsifiers, source of biosurfactants, commercial demulsifiers in order to compare effectiveness between them, stirrer to mix brine with oil and water bath with thermostat. Research part consists of creating w/o emulsion which is stabile in time and does not break under influence of gravity in short time, creation of bio demulsifiers based on chosen sources of bio surfactants like for example soapwort, coconut betaine and lauryl glucoside, and mixed with brine (around 30 % of NaCl), choosing optimal concentration of source of surfactant which would allow to break emulsion instead of stabilizing it, and too chose optimal temperature of process, in range between 20-60 C, which enhance decrease of viscosity of emulsion. The performance of biodemulsifier Is compared with performance of commercial demulsifier. Comparisons are also provided for optimal ranges in which demulsifiers act like emulsion breakers and outside of which start acting like emulsifier.
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Madadi, Hojjat, et Jasmina Casals-Terré. « Study the Effects of Different Surfactants on Hydrophilicity of Polydimethylsiloxane (PDMS) ». Dans ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82399.
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The outstanding characteristics of polydimethylsiloxane (PDMS) caused its extensive use as base material to manufacture microfluidic devices. PDMS has numerous advantages coming from instinct properties such as its low cost, simple fabrication procedure, and robust nature that make it a compatible material in many applications such as biological and biomedical engineering. In spite of favorable physical and chemical properties, hydrophobic surface of PDMS is sometimes debatable. Because of PDMS is highly hydrophobic, pumping aqueous solution through microchannels using only capillary forces might be difficult. Although many surface treatments methods have been proposed to modify and increase the hydrophilicity of PDMS [Oxygen plasma [1], UV-radiation [2], Silanization and Chemical vapour deposition [3],…], the use of surfactants is the most effective and easiest method to overcome the hydrophobicity compared to more complex protocols which require expensive facilities [4,5]. The hydrophilic behavior of surfactant-added PDMS and especially its biocompatibility has allowed many microfluidic bio-applications such as separation of biomolecules [6,7], blood cell separation [8] and cell-based assay [9,10]. This paper discusses about the efficiency of adding different surfactants on the wettability of PDMS.
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Abraham, Damilola, Oyinkepreye Orodu, Vincent Efeovbokhan, Emmanuel Okoro, Temiloluwa Ojo et Lekan Keshinro. « Experimental Studies on the Performance of Bio Based and Industrial Surfactants in Enhanced Oil Recovery ». Dans SPE Nigeria Annual International Conference and Exhibition. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/203759-ms.
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Bartolini, Tony. « Innovative Bio-based Surfactants for Cleaning Product Applications. When Sustainability Comes with Cost Effective Performance ». Dans Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists’ Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.371.
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