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Journal articles on the topic 'Surfactants; Surface active agents'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Wagner, Martin, and H. Johannes Pöpel. "Surface active agents and their influence on oxygen transfer." Water Science and Technology 34, no. 3-4 (1996): 249–56. http://dx.doi.org/10.2166/wst.1996.0438.

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Oxygen transfer rates of fine bubble aeration systems in uniform arrangement are reduced down to 40% to 70% in wastewater compared to clean water conditions. Surfactants in wastewater are the main reason for the inferior and therefore uneconomic performance. The influence of different types of surfactants (anionic and nonionic) and of their concentration on oxygen transfer is investigated at various properties of pure water (content of electrolytes, hardness) by means of extensive experiments. The main results of the investigations are:in dependence of the type of surfactant, its concentration

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2

Olkowska, Ewa, Marek Ruman, and Żaneta Polkowska. "Occurrence of Surface Active Agents in the Environment." Journal of Analytical Methods in Chemistry 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/769708.

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Due to the specific structure of surfactants molecules they are applied in different areas of human activity (industry, household). After using and discharging from wastewater treatment plants as effluent stream, surface active agents (SAAs) are emitted to various elements of the environment (atmosphere, waters, and solid phases), where they can undergo numerous physic-chemical processes (e.g., sorption, degradation) and freely migrate. Additionally, SAAs present in the environment can be accumulated in living organisms (bioaccumulation), what can have a negative effect on biotic elements of e

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3

Anestopoulos, Ioannis, Despina-Evgenia Kiousi, Ariel Klavaris, et al. "Marine-Derived Surface Active Agents: Health-Promoting Properties and Blue Biotechnology-Based Applications." Biomolecules 10, no. 6 (2020): 885. http://dx.doi.org/10.3390/biom10060885.

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Surface active agents are characterized for their capacity to adsorb to fluid and solid-water interfaces. They can be classified as surfactants and emulsifiers based on their molecular weight (MW) and properties. Over the years, the chemical surfactant industry has been rapidly increasing to meet consumer demands. Consequently, such a boost has led to the search for more sustainable and biodegradable alternatives, as chemical surfactants are non-biodegradable, thus causing an adverse effect on the environment. To these ends, many microbial and/or marine-derived molecules have been shown to pos

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Abouzeid, Fatma M. "Study of Steel Electro-dissolution Behavior in Presence of Some Surfactants. Electrochemical Investigation and Surface Active Properties Determination." Revista de Chimie 72, no. 3 (2021): 179–97. http://dx.doi.org/10.37358/rc.21.3.8447.

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Steel electro-dissolution performance was investigated in orthophosphoric acid in the presence of N-oleyl 1.3 diaminopropane, Benzalkounuim chloride, Soduim lauryl sulphate and Di-Isononyl phthalate as a surfactant using potentiodynamic polarization measurements. The retardation performance of these surfactants was examined. The surfactant surface active parameters were estimated based on surface tension measurements. The parameters calculated comprise the critical micelle concentration (CMC), maximum surface excess (Гmax), minimum surface area (Amin) and effectiveness (πCMC). The micellizatio

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Cui, Wei Lin, Wu Ju Xu, and Ling Jian Song. "The Influence of Different Kinds of Surfactants on Rheology in Polymer/Surfactant Complex Flooding." Applied Mechanics and Materials 437 (October 2013): 1089–92. http://dx.doi.org/10.4028/www.scientific.net/amm.437.1089.

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Because of alkaline declining the sweep efficiency, causing scale formation problem in the reservoir and the well bottom and the tubular pipes, so polymer/surfactant compound flooding technology is the emphasis in the research of enhanced recovery. So the articles study the regulation of different kinds of surface active agents at different temperature by MARS Rheometer. The testing result showed that the variation of viscocity under the interaction between the surface active agent and association polymer according to “three stage” model .The linear viscoelastic region of stress decrease when

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6

Olkowska, Ewa, Marek Ruman, Magdalena Drąg-Śmigalska, and Żaneta Polkowska. "Selected anionic and cationic surface active agents: case study on the Kłodnica sediments." Limnological Review 17, no. 1 (2017): 11–21. http://dx.doi.org/10.1515/limre-2017-0002.

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AbstractSurface active agents (surfactants) are a group of chemical compounds, which are used as ingredients of detergents, cleaning products, cosmetics and functional products. After use, wastes containing surfactants or their degradation products are discharged to wastewater treatment plants or directly into surface waters. Due to their specific properties of SAAs, compounds are able to migrate between different environmental compartments such as soil, sediment, water or even living organisms and accumulate there. Surfactants can have a harmful effect on living organisms. They can connect wi

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7

Kawasaki, Hideya. "Surfactant-free solution-based synthesis of metallic nanoparticles toward efficient use of the nanoparticles’ surfaces and their application in catalysis and chemo-/biosensing." Nanotechnology Reviews 2, no. 1 (2013): 5–25. http://dx.doi.org/10.1515/ntrev-2012-0079.

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AbstractThe choice of stabilizer and the stabilizer-to-precursor ions molar ratio during metal nanoparticle synthesis are important for controlling the shape, size, and dispersion stability of the nanoparticles. However, the active sites on the nanoparticles surfaces may be blocked by the stabilizing agents used, resulting in a less-than-effective utilization of the surfaces. In this review, various surfactant-free solution-based methods of synthesizing metal nanoparticles are described, along with the applications of such nanoparticles in catalysis and sensing. “Surfactant-free” synthesis doe

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8

Chatterjee, M., M. K. Naskar, B. Siladitya, and D. Ganguli. "Role of organic solvents and surface-active agents in the sol-emulsion-gel synthesis of spherical alumina powders." Journal of Materials Research 15, no. 1 (2000): 176–85. http://dx.doi.org/10.1557/jmr.2000.0029.

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Spherical alumina particles were prepared following the sol-emulsion-gel method by systematic variation of (i) the concentration of the surfactant Span 80 above or below the critical micelle concentration (CMC) in different organic solvents and (ii) hydrophilic–lipophilic balance (HLB) of different surfactants in cyclohexane. The experimentally determined CMC of Span 80 was found to increase with increasing dielectric constant of the organic solvent, influencing the sol droplet and alumina particle size. With an increase in the HLB value of the surfactants, the tendency of monodispersed sphere

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9

Kurrey, Ramsingh, Anushree Saha, and Manas Kanti Deb. "Distribution of Some Selected Surface Active Agents (SAAs) in the Aquatic and Global Environment with Their Toxic Impact: A Comprehensive Review." Journal of Ravishankar University (PART-B) 33, no. 1 (2020): 31–46. http://dx.doi.org/10.52228/jrub.2020-33-1-6.

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Surface active agents (SAAs) are a class of compounds, which find various applications in different fields of human activities. Surfactants are generally amphiphilic molecules, which are strongly adsorbed at interfaces between the phases. Surfactants windily used as detergency, emulsion, stabilizing and dispersing agents have led to the discharge of highly contaminated wastewaters in aquatic environment. Once reached in the various compartments of the environment such as rivers, lakes, soils, and sediments, surfactants can undergo aerobic or anaerobic degradation. Concentrations of surfactants

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Cichoń, Ewelina, Bartosz Mielan, Elżbieta Pamuła, Anna Ślósarczyk, and Aneta Zima. "Development of highly porous calcium phosphate bone cements applying nonionic surface active agents." RSC Advances 11, no. 39 (2021): 23908–21. http://dx.doi.org/10.1039/d1ra04266a.

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Abaturov, А. Е. "Bacterial surfactants as agents with antibiofilm activity." CHILD`S HEALTH 16, no. 1 (2021): 94–104. http://dx.doi.org/10.22141/2224-0551.16.1.2021.226463.

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Biosuragents are a heterogeneous group of biological surface-active amphiphilic compounds. The producers of biosurfactants are various microorganisms: bacteria and fungi. The class of biosurfactants consists of two groups: low molecular weight and high molecular weight compounds. Representatives of low molecular weight compounds are lipopeptides, glycolipids, fatty acids, phospholipids that reduce surface and interfacial tension, and high molecular weight compounds are polymer and dispersed biosurfactants, which are emulsion stabilizers. The most studied biosurfactants with the potential of dr

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12

Parsi, Kurosh. "Interaction of detergent sclerosants with cell membranes." Phlebology: The Journal of Venous Disease 30, no. 5 (2014): 306–15. http://dx.doi.org/10.1177/0268355514534648.

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Commonly used detergent sclerosants including sodium tetradecyl sulphate (STS) and polidocanol (POL) are clinically used to induce endovascular fibrosis and vessel occlusion. They achieve this by lysing the endothelial lining of target vessels. These agents are surface active (surfactant) molecules that interfere with cell membranes. Surfactants have a striking similarity to the phospholipid molecules of the membrane lipid bilayer. By adsorbing at the cell membrane, surfactants disrupt the normal architecture of the lipid bilayer and reduce the surface tension. The outcome of this interaction

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13

Kaczorowski, Marcin, and Gabriel Rokicki. "Reactive surfactants – chemistry and applications. Part II. Surface - active initiators (inisurfs) and surface - active transfer agents (transurfs)." Polimery 62 (February 2017): 79–85. http://dx.doi.org/10.14314/polimery.2017.079.

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Shapovalov, A. N., R. R. Dema, and S. P. Nefedyev. "Efficiency Improvement of Sintering as a Result of Surface-Active Substance Use in Pelletizing at the JSC "Ural Steel"." Materials Science Forum 870 (September 2016): 507–15. http://dx.doi.org/10.4028/www.scientific.net/msf.870.507.

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A set of pilot experiments to improve pelletizing through the use of the sinter charge humidification of water-soluble organic surface-active agents (surfactants) has been performed in the sintering plant JSC "Ural Steel". It has been found that the surfactant use provides an improved granularity of the sinter charge and increases its gas permeability during sintering that ensures a better technology and quality. The maximum efficiency from the surfactant use is manifested in the area of the optimum moisture content of the sinter charge (7 – 8 %) at a flow rate of the experimental binder 1.2-1

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15

Taba, Paulina, Russell F. Howe, and Graine Moran. "FTIR AND NMR STUDIES OF ADSORBED CETHYLTRIMETHYLAMMONIUM CHLORIDE IN MCM-41 MATERIALS." Indonesian Journal of Chemistry 8, no. 1 (2010): 1–6. http://dx.doi.org/10.22146/ijc.21639.

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The high use of surface-active agents (surfactants) by industry and households today leads to environmental pollution, therefore treatments are required to remove such substances from the environment. One of the important and widely used methods for removal of substances from solution is adsorption. In this research, MCM-41 and its modified product of MCM41-TMCS were used to adsorb cationic surfactants, cethyltrimethylammonium chloride, CTAC. FTIR and NMR methods were used to study the interaction between the surfactants and the adsorbents. MCM-41 was synthesized hydrothermally at 100 oC and i

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Wybieralska, Katarzyna, and Anna Wajda. "Removal of Organic Dyes from Aqueous Solutions with Surfactant-Modified Magnetic Nanoparticles." Polish Journal of Chemical Technology 16, no. 2 (2014): 27–30. http://dx.doi.org/10.2478/pjct-2014-0025.

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Abstract The paper presents the results of studies on the possibility of using magnetic nanoparticles modified with selected hydrophobic surfactants for model post-production water purification. Colloidal solutions of iron hydroxide (III) and iron oxide (II and III) were obtained and their particles were subjected to surface modification using surfactants. Thus obtained magnetic fluids were used as active agents in the process of removing selected organic dyes from their aqueous solutions. The effectiveness of the modified compounds was analysed using spectrophotometric methods. It has been sh

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17

Lepo, Joe Eugene, M. Patricia Hancock, Candy L. Zuleger, Katharine Roupp-Edwards, Tim Reilly, and David E. Fritz. "EFFECTIVENESS AND SAFETY OF BIOSURFACTANTS AS AGENTS OF OIL SPILL RESPONSE." International Oil Spill Conference Proceedings 1997, no. 1 (1997): 687–96. http://dx.doi.org/10.7901/2169-3358-1997-1-687.

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ABSTRACT Biosurfactants play an important role in facilitating the natural biodegradation of petroleum hydrocarbons. In order to characterize the biosurfactant-producing potential of environments at risk of anthropogenic oil contamination, we collected a number of distinct marine bacteria that emulsified crude oil from relatively pristine and from polluted areas. The bacteria belonged to diverse taxonomic groups and varied widely in oil-emulsifying capability, surface tension reduction of culture media, and hydrophobicity. We used laboratory assays that directly evaluated biosurfactant prepara

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18

Abdellattif, Magda H., A. M. F. Eissa, and H. M. Mohamed. "Synthesis of Anionic Surface Active Agents Containing Heterocyclic Moiety From Long Chain Fatty Alcohols." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 10 (2017): 5935–43. http://dx.doi.org/10.24297/jac.v13i10.5819.

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A series of novel groups of anionic surface active agent were synthesized. Synthesis of these surfactants via the reaction of long chain fatty alcohols (octyl, decyl and dodecyl) with maleic anhydride to give monoester. The monoester chloride reacted with amino derivatives of heterocyclic rings followed by addition of NaHSO3 .The surface tension, interfacial tension; Kraft point, emulsifying and wetting power were evaluated. Stability to hydrolysis, biodegradability and biological activities were measured. A comparison studies between the chemical structures and the results were done.

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19

Adilina, Indri Badria, Egi Agustian, Yenny Meliana, and Anny Sulaswatty. "SYNTHESIS AND PROPERTIES OF ETHOXYLATED GLYCEROL MONOOLEATE AS PALM OIL BASED NONIONIC SURFACTANTS." Jurnal Kimia Terapan Indonesia 17, no. 1 (2015): 49–55. http://dx.doi.org/10.14203/jkti.v17i1.22.

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Palm oil based nonionic surfactants were synthesized by reacting glycerol monooleate with ethylene oxide at 80 ºC in the prescence of an alkaline catalyst. Purification of the products was conducted by use of acetic acid and black carbon which gave ethoxylated products (EGMO) with a higher level of viscocity and greater solubility in water. Physical and chemical properties of the product such as surface activity, cloud point, acid value, ester value, hydroxyl value, and hydrophilic-lipophilic balance was also determined and results varied depending on the reagent molar ratio. The synthesized E

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20

Juwarkar, Asha, P. Sudhakar Babu, Kirti Mishra, and Megha Deshpande. "APPLICATION OF BIOSURFACTANT IN OIL SPILL MANAGEMENT." International Oil Spill Conference Proceedings 1993, no. 1 (1993): 503–4. http://dx.doi.org/10.7901/2169-3358-1993-1-503.

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ABSTRACT Surfactants are surface active agents which reduce surface tension and interfacial tension between two immiscible phases and help in emulsification. Toxicity, nonbiodegradability, and limited structural types of chemical surfactants have initiated the need for effective substitutes. Biosurfactants, which are synthesized by specific microbial cultures, have surface active properties comparable to chemical surfactants. They are compounds that can help in oil spill cleanup operations without presenting the problems posed by chemical surfactants. Two bacterial cultures were isolated from

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21

Fletcher, P. D. I. "Book ReviewA directory of surface active agents available in Europe, 3rd edition, Surfactants Europa." Journal of Chemical Technology & Biotechnology 67, no. 2 (1996): 214. http://dx.doi.org/10.1002/(sici)1097-4660(199610)67:2<214::aid-jctb4555>3.0.co;2-0.

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22

Lugovaya, I. S., S. V. Pozyabin, and T. O. Azarnova. "Case of acute esophagogastroectasia in a cat." Veterinariya, Zootekhniya i Biotekhnologiya 1, no. 7 (2021): 13–20. http://dx.doi.org/10.36871/vet.zoo.bio.202107002.

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Cases of poisoning of domestic animals with household chemicals, in particular, chlorine-containing and surface-active substances (surfactants) are not uncommon, however, the changes occurring in the body under the action of this group of substances are insufficiently described. This article describes a case of acute gastric dilatation and megaesophagus in a cat, presumably against the background of poisoning with surfactants and chlorine-containing agents, including pathogenetic X-ray diagnostics and blood tests.

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Titta, A., M. Le Merrer, F. Detcheverry, P. D. M. Spelt, and A. L. Biance. "Level-set simulations of a 2D topological rearrangement in a bubble assembly: effects of surfactant properties." Journal of Fluid Mechanics 838 (January 12, 2018): 222–47. http://dx.doi.org/10.1017/jfm.2017.887.

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A liquid foam is a dispersion of gas bubbles in a liquid matrix containing surface-active agents. Its flow involves the relative motion of bubbles, which switch neighbours during a so-called topological rearrangement of type 1 (T1). The dynamics of T1 events, as well as foam rheology, have been extensively studied, and experimental results point to the key role played by surfactants in these processes. However, the complex and multiscale nature of the system has so far impeded a complete understanding of the mechanisms involved. In this work, we investigate numerically the effect of surfactant

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Faísca, Francisco, Luis Filipe, Zeljko Petrovski, Miguel M. Santos, Sandra Gago, and Luís C. Branco. "Ionic Systems and Nanomaterials as Antiseptic and Disinfectant Agents for Surface Applications: A Review." Surfaces 4, no. 2 (2021): 169–90. http://dx.doi.org/10.3390/surfaces4020016.

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Antiseptics and disinfectants are extensively used for a variety of topical and hard-surface applications. A wide variety of biocides as active chemical agents is found in these products, including alcohols, phenols, iodine, and chlorine. Many of these active agents demonstrate broad-spectrum antimicrobial activity; however, the mode of action of these agents is not well-documented. This review is focused on several examples of ionic systems based on ionic surfactants and ionic liquids as well as nanomaterials and nanoparticles acting as antiseptics and disinfectants for surfaces. It is import

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Canevari, Gerard P. "BASIC STUDY REVEALS HOW DIFFERENT CRUDE OILS INFLUENCE DISPERSANT PERFORMANCE." International Oil Spill Conference Proceedings 1987, no. 1 (1987): 293–96. http://dx.doi.org/10.7901/2169-3358-1987-1-293.

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ABSTRACT Previous research has shown that crude oils contain various amounts of indigenous surface active agents that stabilize water-in-oil emulsions. It is also known that crude oils stabilize such emulsions to different extents. One aspect of the study was to investigate the relationship between the emulsion forming tendency of the various crude oils and the level of performance of a chemical dispersant on the particular crude oil. The results of the extensive laboratory test program indicated that dispersant effectiveness is a function of both dispersant type and the specific crude oil. Ho

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Makarewicz, Edwin, and Krzysztof Jan´czak. "The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions." Polish Journal of Chemical Technology 9, no. 1 (2007): 43–50. http://dx.doi.org/10.2478/v10026-007-0011-1.

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The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions The work presents the research, the aim of which is to specify the influence of organic diluents and solvents such as xylene, toluene, n-butyl acetate and butanol as well as cyclohexanone on the stability of water dispersions of the PVC plastisol containing various surface-active agents (SAA). The applied surfactants were characterised by a specific ethoxylation number, molecular mass, the Hildebrand parameter, hydrophilic-hydrophobic balance, surface activity, the limiting viscosity number, the

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Tantawy, Ahmed H., Hany I. Mohamed, Ahmed A. Khalil, Kaouser A. Hebash, and Mahmoud Z. Basyouni. "Novel bioactive imidazole-containing polymeric surfactants as petroleum-collecting and dispersing agents: Synthesis and surface-active properties." Journal of Molecular Liquids 236 (June 2017): 376–84. http://dx.doi.org/10.1016/j.molliq.2017.04.040.

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Pirog, T. P., L. V. Kliuchka, T. A. Shevchuk, and G. O. Iutynska. "Destruction of Biofilms on Silicone Tubes under the Action of a Mixture of Nocardia vaccinii IMV B-7405 Surfactants with other Biocides." Mikrobiolohichnyi Zhurnal 83, no. 4 (2021): 43–53. http://dx.doi.org/10.15407/microbiolj83.04.043.

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The formation of pathogenic microorganisms biofilms on the central venous catheter is the cause of catheter-associated infections. An alternative method of combating biofilms is the use of “antibacterial” and “antifungal” locks, which are solutions of antibiotics or antifungal drugs in a mixture with other natural compounds, which can be microbial surface-active substances (surfactants) or essential oils. Aim. To investigate the role of Nocardia vaccinii IMV B-7405 surfactants mixture with other antimicrobial compounds in the destruction of biofilm on silicone tubes. Methods. N. vaccinii IMV B

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Olkowska, Ewa, Marek Ruman, Anna Kowalska, and Żaneta Polkowska. "Determination of Surfactants in Environmental Samples. Part II. Anionic Compounds." Ecological Chemistry and Engineering S 20, no. 2 (2013): 331–42. http://dx.doi.org/10.2478/eces-2013-0024.

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Abstract Surface active agents (SAA) with negative charge of polar group are named as anionic compounds. They are the main constituent of most products containing synthetic surfactants. The linear alkylbenzene sulfonates (LAS), alkyl ethoxysulfates (AES) and alkyl sulfates (AS) are typically applied from this class of compounds. Those surfactants are ingredients of household detergents and cleaners, laundry detergents, cosmetic etc. Moreover they can be applied in the paper, textile and tanning industry as optical brighteners, dispersant, wetting and suspending agents. They can be substrates i

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Boyer, Ivan, Christina L. Burnett, Wilma F. Bergfeld, et al. "Safety Assessment of PEGs Cocamine and Related Ingredients as Used in Cosmetics." International Journal of Toxicology 37, no. 2_suppl (2018): 10S—60S. http://dx.doi.org/10.1177/1091581818794417.

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The Cosmetic Ingredient Review Expert Panel assessed the safety of 47 polyethylene glycols (PEGs) cocamine and related ingredients, which are reported to function mostly as surfactants and antistatic agents. The Panel reviewed the relevant data and developed a framework to satisfy previously identified data deficiencies for this group of materials as well as extend the scope of related materials covered by the analysis. The irritation potential of these ingredients is consistent with the surface active properties that are characteristic of surfactants. The Panel concluded that the PEGs cocamin

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Taba, Paulina. "FTIR AND NMR STUDIES OF ADSORBED TRITON X-114 IN MCM-41 MATERIALS." Indonesian Journal of Chemistry 9, no. 2 (2010): 184–88. http://dx.doi.org/10.22146/ijc.21527.

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One source of water pollutions is caused by the high use of surface-active agents (surfactants) by industries and households. As a consequence, it is required to remove such substances from the environment One of the important and widely used methods for removal of substances from solution is adsorption. In this research, MCM-41 and its modification MCM41-TMCS were used to adsorb nonionic surfactant, Triton X-114. FTIR and NMR methods were used to study the interaction between the surfactants and the adsorbents. MCM-41 was synthesized hydrothermally at 100 oC and its modification was conducted

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Shamsuri, Ahmad Adlie, and Siti Nurul Ain Md. Jamil. "Functional Properties of Biopolymer-Based Films Modified with Surfactants: A Brief Review." Processes 8, no. 9 (2020): 1039. http://dx.doi.org/10.3390/pr8091039.

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An increase of environmental awareness recently has increased the interest of researchers in using of biopolymer-based films. The films have been prepared extensively by utilizing starch, carboxymethyl cellulose, chitosan, protein, gelatin, carrageenan, alginate, pectin, guar gum and pullulan. They are typically modified with surface-active agents (surfactants) such as glycerol monostearate, sucrose ester, sodium stearoyl lactate, sodium dodecyl sulfate, ethyl lauroyl arginate HCl, Span 20 to 80, Tween-20 to 80 and soy lecithin for improving the functional properties of the films. In this brie

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Stone, H. A., and L. G. Leal. "The effects of surfactants on drop deformation and breakup." Journal of Fluid Mechanics 220 (November 1990): 161–86. http://dx.doi.org/10.1017/s0022112090003226.

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The effects of surface-active agents on drop deformation and breakup in extensional flows at low Reynolds numbers are described. In this free-boundary problem, determination of the interfacial velocity requires knowledge of the distribution of surfactant, which, in turn, requires knowledge of the interfacial velocity field. We account for this explicit coupling of the unknown drop shape and the evolving surfactant distribution. An analytical result valid for nearly spherical distortions is presented first. Finite drop deformation is studied numerically using the boundary-integral method in con

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Olkowska, Ewa, Marek Ruman, Anna Kowalska, and Żaneta Polkowska. "Determination of Surfactants in Environmental Samples. Part III. Non-Ionic Compounds." Ecological Chemistry and Engineering S 20, no. 3 (2013): 449–61. http://dx.doi.org/10.2478/eces-2013-0033.

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Abstract Non-ionic surface active agents are a diverse group of chemicals which have an uncharged polar head and a non-polar tail. They have different properties due to amphiphilic structure of their molecules. Commercial available non-ionic surfactants consist of the broadest spectrum of compounds in comparison with other types of such agents. Typically, non-ionic compounds found applications in households and industry during formulation of cleaning products, cosmetics, paints, preservative coatings, resins, textiles, pulp and paper, petroleum products or pesticides. Their are one of the most

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Gutierrez, Tony, Gordon Morris, Dave Ellis, Barbara Mulloy, and Michael D. Aitken. "Production and characterisation of a marine Halomonas surface-active exopolymer." Applied Microbiology and Biotechnology 104, no. 3 (2019): 1063–76. http://dx.doi.org/10.1007/s00253-019-10270-x.

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AbstractDuring screening for novel emulsifiers and surfactants, a marine gammaproteobacterium, Halomonas sp. MCTG39a, was isolated and selected for its production of an extracellular emulsifying agent, P39a. This polymer was produced by the new isolate during growth in a modified Zobell’s 2216 medium amended with 1% glucose, and was extractable by cold ethanol precipitation. Chemical, chromatographic and nuclear magnetic resonance spectroscopic analysis confirmed P39a to be a high-molecular-weight (~ 261,000 g/mol) glycoprotein composed of carbohydrate (17.2%) and protein (36.4%). The polymer

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Mercurio, M. R., J. M. Fiascone, D. M. Lima, and H. C. Jacobs. "Surface tension and pulmonary compliance in premature rabbits." Journal of Applied Physiology 66, no. 5 (1989): 2039–44. http://dx.doi.org/10.1152/jappl.1989.66.5.2039.

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In vitro surface properties of pulmonary surfactant thought to be essential to its ability to increase pulmonary compliance include minimum surface tension less than 10 dyn/cm and large surface tension variability and hysteresis. We tested four surface-active agents (Tween 20, a detergent; and FC-100, FC-430, and FC-431, industrial fluorocarbons), all lacking these properties, for their ability to increase pulmonary compliance in surfactant-deficient premature rabbits. Fetal rabbits were delivered by cesarean section at 27 days (full term = 31 days) and injected via tracheostomy with 50% lacta

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Mohareb, Rafat M., Abdelfatah M. Badawi, Mahmoud R. Noor El-Din, Nesreen A. Fatthalah, and Marian R. Mahrous. "Synthesis and Characterization of Cationic Surfactants Based on N-Hexamethylenetetramine as Active Microfouling Agents." Journal of Surfactants and Detergents 18, no. 3 (2015): 529–35. http://dx.doi.org/10.1007/s11743-014-1662-6.

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Pantyo, V. V., M. M. Fizer, O. I. Fizer, G. M. Koval, and E. M. Danko. "Anti-microbial activity of heterocyclic cationic surface-active substances." Reports of Vinnytsia National Medical University 24, no. 1 (2020): 36–40. http://dx.doi.org/10.31393/reports-vnmedical-2020-24(1)-07.

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Annotation. The development and rapid pace of the spread of resistance to antimicrobial agents predetermines the search for new methods of counteracting pathogenic and conditionally pathogenic microorganisms. In this context, studies of the antimicrobial activity of newly synthesized chemicals, which in the future can be considered as candidates for antiseptic and disinfectants, are relevant. The aim of the work was to determine the antimicrobial activity of new ionic associates based on the surface-active cetylpyridinium cation with respect to certain opportunistic microorganisms. The antimic

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Shi, Hui Bei, and Yong Zhu Cui. "The Preparation and Application of Non/Anionic Pre-Treatment Agent for Spandex Fabric." Advanced Materials Research 781-784 (September 2013): 2672–75. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2672.

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Spandex fabric is widely used with excellent elasticity. The oil (especially a silicone oil), which is used for easement of processing is difficult to be removed in the former processing, furthermore only rely on a treatment agent is very difficult to achieve the cleaning effect. This article we attempted to take advantage of a complex of anionic surfactants and a nonionic surface active agent to built Anionic / non-ionic agents, which has better foaming stability and the fabric processed has better whiteness, the capillary effect, the elastic elongation and elastic recovery compared to the fa

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Nathoo, S. A., and A. Gaffar. "Studies on Dental Stains Induced by Antibacterial Agents and Rational Approaches for Bleaching Dental Stains." Advances in Dental Research 9, no. 4 (1995): 462–70. http://dx.doi.org/10.1177/08959374950090041801.

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Extrinsic stain resides in the dental pellicle and can be caused by introduction of chromogenic materials or therapeutic agents into the oral cavity. In contrast, intrinsic tooth stain is found within the tooth structure and can be caused by a variety of agents, including hematological and developmental abnormalities and drugs such as tetracycline. The mechanisms of extrinsic stain formation differ with respect to the causative agent. For example, stain induced by chlorhexidine (CH) can be explained by an increased rate in the non-enzymatic browning reactions occurring at the pellicle surface,

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Panteleeva, Lyudmila Grigoryevna. "Sensitivity of coronaviruses to disinfectants according to the results of foreign and domestic studies." Disinfection affairs, no. 3 (September 2021): 28–35. http://dx.doi.org/10.35411/2076-457x-2021-3-28-35.

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More than 40 different species of the family Coronaviridae are known. The greatest epidemiological significance was acquired by SARS-CoV-2, the causative agent of a new coronavirus infection-COVID-19. It can persist on the surfaces of various objects from several hours to several days. It is sensitive to disinfectants from different chemical groups: chlorine-, oxygen-active, cationic surfactants, alcohols, aldehydes, and iodine-containing agents. Keywords: coronaviruses, survival rate, disinfectants, virucidal activity, virus sensitivity.

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Olkowska, Ewa, Marek Ruman, Anna Kowalska, and Żaneta Polkowska. "Determination of Surfactants in Environmental Samples. Part I. Cationic Compounds / Oznaczanie Surfaktantów W Próbkach Środowiskowych. Część I. Związki Kationowe." Ecological Chemistry and Engineering S 20, no. 1 (2013): 69–77. http://dx.doi.org/10.2478/eces-2013-0005.

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Abstract Compounds from the group of cationic surfactants are widely applied in household, industrial, cleaning, disinfectant, cosmetic and pharmaceutical products as their specific properties (antimicrobial, emulsifying, anticorrosion, softening). After use, cationic surfactants are disposed to wastewater-treatment plants and finally with effluent water to surface waters due to their incomplete degradation. Moreover, they can freely circulate in different environmental compartments including living organisms. It becomes indispensable to recognize in more detail behavior, fate and biological e

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Xi, Wei, Yuanye Ping, and Masoome Agha Alikhani. "A Review on Biosurfactant Applications in the Petroleum Industry." International Journal of Chemical Engineering 2021 (August 30, 2021): 1–10. http://dx.doi.org/10.1155/2021/5477185.

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The inadequacy of worldwide fossil fuel resources, combined with increasing energy demands, encourages global attention to either using alternative energy resources or improving the recovery factor and produce larger quantities from present reservoirs. Among all enhanced oil recovery (EOR) methods, surfactant injection is a well-known technique that reduces the interfacial tension (IFT) between oil and water and increases oil production. Despite numerous advantages of using surfactants, there are also a few obstacles like environmental impacts, high cost, effect on humans and other organisms d

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Eswari, Jujjavarapu S. "Production of Rhamnolipid Biosurfactant from Fed Batch Culture by Pseudomonas aeruginosa using Multiple Substrates." Current Nutrition & Food Science 16, no. 6 (2020): 928–33. http://dx.doi.org/10.2174/1573401314666181107100127.

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Objective: Biosurfactants are the surface active agents which are used for the reduction of surface and interfacial tensions of liquids. Rhamnolipids are the surfactants produced by Pseudomonas aeruginosa. It requires minimum nutrition for its growth as it can also grow in distilled water. The rhamnolipids produced by Pseudomonas aeruginosa are extra-cellular glycolipids consisting of L-rhamnose and 3-hydroxyalkanoic acid. Methods: The fed-batch method for the rhamnolipid production is considered in this study to know the influence of the carbon, nitrogen, phosphorous substrates as growth-limi

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Markowski, Maciej, Włodzimierz Golus, Żaneta Polkowska, and Monika Kwidzińska. "Surfactants: a real threat to the aquatic geoecosystems of lobelia lakes." Limnological Review 17, no. 4 (2017): 183–93. http://dx.doi.org/10.1515/limre-2017-0017.

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Abstract Lobelia lakes are valuable elements of the natural environment. They are characterised by low trophy, mainly in-forest location and a high transparency of water. However, similarly to other surface waters, they are subjected to increasing anthropogenic pressures, a good indicator of which is the level of surfactants, also called surface-active agents (SAAs). The aim of the study was to evaluate the intensity of anthropogenic pressures in 13 selected lobelia lakes and 14 streams in the catchments of these lakes in Northern Poland, based on SAA concentrations in the waters of these wate

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Pena-Pereira, Francisco, Regina M. B. O. Duarte, Tito Trindade, and Armando C. Duarte. "Determination of anionic surface active agents using silica coated magnetite nanoparticles modified with cationic surfactant aggregates." Journal of Chromatography A 1299 (July 2013): 25–32. http://dx.doi.org/10.1016/j.chroma.2013.05.040.

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Zhang, Yu, Mobing Zhuang, Pablo Campo, et al. "Comparative Study to Determine the Biodegradability of Dispersants at Environmentally Relevant Concentrations." International Oil Spill Conference Proceedings 2017, no. 1 (2017): 331–46. http://dx.doi.org/10.7901/2169-3358-2017.1.331.

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ABSTRACT Chemical dispersant agents reduce the interfacial tension between oil and water, and increase the surface area to volume ratio of oil droplets thus facilitating the biodegradation of spilled oil. Dispersants are composed of surface active molecules known as surfactants and various commercial products contain Dioctyl Sulfosuccinate (DOSS) as the active surfactant ingredient. Since previous laboratory studies were conducted at oil and dispersant concentrations significantly higher (~0.7 g/L oil with Dispersant to Oil Ratio (DOR) of 1:25) than those typically found in field conditions, e

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Tangparitkul, Suparit, Thibaut Charpentier, Diego Pradilla, and David Harbottle. "Interfacial and Colloidal Forces Governing Oil Droplet Displacement: Implications for Enhanced Oil Recovery." Colloids and Interfaces 2, no. 3 (2018): 30. http://dx.doi.org/10.3390/colloids2030030.

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Growing oil demand and the gradual depletion of conventional oil reserves by primary extraction has highlighted the need for enhanced oil recovery techniques to increase the potential of existing reservoirs and facilitate the recovery of more complex unconventional oils. This paper describes the interfacial and colloidal forces governing oil film displacement from solid surfaces. Direct contact of oil with the reservoir rock transforms the solid surface from a water-wet to neutrally-wet and oil-wet as a result of the deposition of polar components of the crude oil, with lower oil recovery from

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Matmin, Juan, Irwan Affendi, Salizatul Ibrahim, and Salasiah Endud. "Additive-Free Rice Starch-Assisted Synthesis of Spherical Nanostructured Hematite for Degradation of Dye Contaminant." Nanomaterials 8, no. 9 (2018): 702. http://dx.doi.org/10.3390/nano8090702.

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Nanostructured hematite materials for advanced applications are conventionally prepared with the presence of additives, tainting its purity with remnants of copolymer surfactants, active chelating molecules, stabilizing agents, or co-precipitating salts. Thus, preparing nanostructured hematite via additive-free and green synthesis methods remains a huge hurdle. This study presents an environmentally friendly and facile synthesis of spherical nanostructured hematite (Sp-HNP) using rice starch-assisted synthesis. The physicochemical properties of the Sp-HNP were investigated by Fourier-transform

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Thakur, Shubham, Amrinder Singh, Ritika Sharma, Rohan Aurora, and Subheet Kumar Jain. "Biosurfactants as a Novel Additive in Pharmaceutical Formulations: Current Trends and Future Implications." Current Drug Metabolism 21, no. 11 (2020): 885–901. http://dx.doi.org/10.2174/1389200221666201008143238.

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Background: Surfactants are an important category of additives that are used widely in most of the formulations as solubilizers, stabilizers, and emulsifiers. Current drug delivery systems comprise of numerous synthetic surfactants (such as Cremophor EL, polysorbate 80, Transcutol-P), which are associated with several side effects though used in many formulations. Therefore, to attenuate the problems associated with conventional surfactants, a new generation of surface-active agents is obtained from the metabolites of fungi, yeast, and bacteria, which are termed as biosurfactants. Objectives:

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