Patrick Denk, Lauren Matthews, Thomas Zemb, Werner Kunz
Bicelles can be formed by mixing in given mole fractions two ethoxylated alkyl ether carboxylic acid surfactants of very different HLB in water. We determine the effect of adding three of the most used additives in formulation in health- and home care: propylene glycol, glycerol, and ethanol. The effects of additives are determined and compared in a concentrated isotropic phase above the LCST, a pseudo-lamellar phase, and a discotic nematic phase. The two latter are birefringent, and the nematic phase is viscoelastic. Propylene glycol acts as a co-solvent, improving the temperature stability of the nematic phase up to 20 wt% propylene glycol. Further addition of propylene glycol reduces the phase transition temperatures, inducing microstructural changes due to headgroup dehydration and preferential solubilization of the hydrophilic short chain surfactant. Glycerol acts as an anti-solvent, progressively decreasing phase transition temperatures by dehydration of headgroups. Ethanol is a good co-solvent for the surfactant-mixture. Adding up to 5 wt% ethanol increases the temperature stability of the nematic phase. Higher concentrations of ethanol lead to a single isotropic phase with increasingly molecular dissolution of the surfactants. The effect of the considered additives on molecular packing is followed by high resolution X-ray scattering.
{"title":"Formulating additives in thermoresponsive surfactant-based nematic liquid crystals","authors":"Patrick Denk, Lauren Matthews, Thomas Zemb, Werner Kunz","doi":"10.1515/tsd-2023-2579","DOIUrl":"https://doi.org/10.1515/tsd-2023-2579","url":null,"abstract":"Bicelles can be formed by mixing in given mole fractions two ethoxylated alkyl ether carboxylic acid surfactants of very different HLB in water. We determine the effect of adding three of the most used additives in formulation in health- and home care: propylene glycol, glycerol, and ethanol. The effects of additives are determined and compared in a concentrated isotropic phase above the LCST, a pseudo-lamellar phase, and a discotic nematic phase. The two latter are birefringent, and the nematic phase is viscoelastic. Propylene glycol acts as a co-solvent, improving the temperature stability of the nematic phase up to 20 wt% propylene glycol. Further addition of propylene glycol reduces the phase transition temperatures, inducing microstructural changes due to headgroup dehydration and preferential solubilization of the hydrophilic short chain surfactant. Glycerol acts as an anti-solvent, progressively decreasing phase transition temperatures by dehydration of headgroups. Ethanol is a good co-solvent for the surfactant-mixture. Adding up to 5 wt% ethanol increases the temperature stability of the nematic phase. Higher concentrations of ethanol lead to a single isotropic phase with increasingly molecular dissolution of the surfactants. The effect of the considered additives on molecular packing is followed by high resolution X-ray scattering.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"43 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fumin Guo, Xuepeng Li, Jun Fan, Xuebin Ma, Zhongni Wang
In this paper, the lamellar liquid crystals formed in S1570-Brij97/isopropyl myristate/PEG400 aqueous system were prepared at 37 °C. The effects of PEG400 and curcumin on the S1570-Brij97 lyotropic liquid crystal systems were studied by phase diagram, polarized optical microscopy, small angle X-ray scattering, and rheology. The prepared lamellar liquid crystals show stable structures at 37 °C. The encapsulation of curcumin improves the structural stability of the lamellar liquid crystals, which can be confirmed by their higher ηγ=0.013 and σy values, suggesting that the S1570-Brij97 lamellar liquid crystals are good carriers for curcumin. In addition, the prepared lamellar liquid crystals can effectively protect curcumin from decomposition, and curcumin can be released slowly in the liquid crystals. Therefore, based on the structural stability, protective effect on curcumin, and slow-release behavior, the constructed S1570-Brij97 lamellar liquid crystals have good potential for drug delivery.
{"title":"Lamellar liquid crystals formed from sucrose ester and Brij97 solutions for curcumin delivery","authors":"Fumin Guo, Xuepeng Li, Jun Fan, Xuebin Ma, Zhongni Wang","doi":"10.1515/tsd-2023-2569","DOIUrl":"https://doi.org/10.1515/tsd-2023-2569","url":null,"abstract":"In this paper, the lamellar liquid crystals formed in S1570-Brij97/isopropyl myristate/PEG400 aqueous system were prepared at 37 °C. The effects of PEG400 and curcumin on the S1570-Brij97 lyotropic liquid crystal systems were studied by phase diagram, polarized optical microscopy, small angle X-ray scattering, and rheology. The prepared lamellar liquid crystals show stable structures at 37 °C. The encapsulation of curcumin improves the structural stability of the lamellar liquid crystals, which can be confirmed by their higher <jats:italic>η</jats:italic> <jats:sub> <jats:italic>γ</jats:italic>=0.013</jats:sub> and <jats:italic>σ</jats:italic> <jats:sub> <jats:italic>y</jats:italic> </jats:sub> values, suggesting that the S1570-Brij97 lamellar liquid crystals are good carriers for curcumin. In addition, the prepared lamellar liquid crystals can effectively protect curcumin from decomposition, and curcumin can be released slowly in the liquid crystals. Therefore, based on the structural stability, protective effect on curcumin, and slow-release behavior, the constructed S1570-Brij97 lamellar liquid crystals have good potential for drug delivery.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"25 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139764114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Six surface-active ionic liquids (SAILs) with herbicidal anions were synthetized (with a yield of ≥ 88 %) and their structure was confirmed by NMR spectra. Subsequently, their surface properties, phytotoxicity and bulk aggregation behavior in aqueous solution investigated. The compounds studied have an amphiphilic structure and, due to the presence of two long alkyl chains in the cation, they displayed surface activity (CMC values, ranging from 0.13 mmol L−1 to 1.36 mmol L−1). Our results provide explanations for the role of counterions in the physical and chemical properties of SAILs. Indeed, the aromatic anion affects the hydrophilic charge of the surface-active compounds. The SAILs containing the [MCPA]− and [MCPP]− anions were the most phytotoxic to representatives of dicotyledonous plants compared to the other compounds. By analysis of the structure of SAILs, we demonstrate that counterions play an important role in self-assembly and adsorption processes in aqueous solutions, and therefore, in the potential biological application of these compounds.
{"title":"The influence of herbicidal anions on chemical shifts in NMR, phytotoxicity and surface properties of pyrrolidinium surface-active ionic liquids","authors":"Marta Wojcieszak, Anna Syguda, Katarzyna Materna","doi":"10.1515/tsd-2023-2571","DOIUrl":"https://doi.org/10.1515/tsd-2023-2571","url":null,"abstract":"Six surface-active ionic liquids (SAILs) with herbicidal anions were synthetized (with a yield of ≥ 88 %) and their structure was confirmed by NMR spectra. Subsequently, their surface properties, phytotoxicity and bulk aggregation behavior in aqueous solution investigated. The compounds studied have an amphiphilic structure and, due to the presence of two long alkyl chains in the cation, they displayed surface activity (CMC values, ranging from 0.13 mmol L<jats:sup>−1</jats:sup> to 1.36 mmol L<jats:sup>−1</jats:sup>). Our results provide explanations for the role of counterions in the physical and chemical properties of SAILs. Indeed, the aromatic anion affects the hydrophilic charge of the surface-active compounds. The SAILs containing the [MCPA]<jats:sup>−</jats:sup> and [MCPP]<jats:sup>−</jats:sup> anions were the most phytotoxic to representatives of dicotyledonous plants compared to the other compounds. By analysis of the structure of SAILs, we demonstrate that counterions play an important role in self-assembly and adsorption processes in aqueous solutions, and therefore, in the potential biological application of these compounds.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"13 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139764234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper investigates the interactions and aggregation behavior of biosurfactants, sodium cholate (NaC) and sodium deoxycholate (NaDC) in aqueous solutions of Emtricitabine and Lamivudine (anti-HIV drugs). The study uses conductometry and UV–visible spectroscopy techniques to evaluate the critical micelle concentration (CMC) at different temperatures ranging from 298.15 K to 313.15 K with a variation of 5 K. The temperature dependence of the CMC was examined, and the stability of micelles was analyzed in light of the hydrophobic-hydrophilic interactions involved in this system. The CMC obtained from both the methods are in agreement. Various thermodynamic parameters, such as ∆Hm0${increment}{H}_{m}^{0}$, ∆Sm0${increment}{S}_{m}^{0hspace{0.17em}}$ and ∆Gm0${increment}{G}_{m}^{0}$ have been estimated using a “pseudo-phase separation model” to understand the contribution of the chemical and de-solvation part in the micellization process. Furthermore, the enthalpy-entropy compensation plots validate the micellar stability of the studied systems.
本文研究了生物表面活性剂、胆酸钠（NaC）和脱氧胆酸钠（NaDC）在恩曲他滨和拉米夫定（抗艾滋病毒药物）水溶液中的相互作用和聚集行为。研究采用电导测量法和紫外-可见光谱法评估了在 298.15 K 至 313.15 K 不同温度下的临界胶束浓度（CMC），变化幅度为 5 K。两种方法得出的 CMC 一致。各种热力学参数，如 ∆ H m 0 ${increment}{H}_{m}^{0}$ 、 ∆ S m 0 ${increment}{S}_{m}^{0hspace{0.17em}}$ 和 ∆ G m 0 ${increment}{G}_{m}^{0}$ 是利用 "伪相分离模型 "估算的，以了解微胶化过程中化学和去溶解部分的贡献。此外，焓熵补偿图验证了所研究体系的胶束稳定性。
{"title":"Aggregation behavior and thermodynamic parameters of biosurfactants (NaC/NaDC) in aqueous medium of Emtricitabine and Lamivudine (anti-HIV drugs)","authors":"Richa Sharma, Suvarcha Chauhan, Naveen Thakur, Kuldeep Kumar","doi":"10.1515/tsd-2023-2564","DOIUrl":"https://doi.org/10.1515/tsd-2023-2564","url":null,"abstract":"This paper investigates the interactions and aggregation behavior of biosurfactants, sodium cholate (NaC) and sodium deoxycholate (NaDC) in aqueous solutions of Emtricitabine and Lamivudine (anti-HIV drugs). The study uses conductometry and UV–visible spectroscopy techniques to evaluate the critical micelle concentration (CMC) at different temperatures ranging from 298.15 K to 313.15 K with a variation of 5 K. The temperature dependence of the CMC was examined, and the stability of micelles was analyzed in light of the hydrophobic-hydrophilic interactions involved in this system. The CMC obtained from both the methods are in agreement. Various thermodynamic parameters, such as <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mo>∆</m:mo> <m:msubsup> <m:mi>H</m:mi> <m:mi>m</m:mi> <m:mn>0</m:mn> </m:msubsup> </m:mrow> </m:math> <jats:tex-math>${increment}{H}_{m}^{0}$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_tsd-2023-2564_ineq_001.png\" /> </jats:alternatives> </jats:inline-formula>, <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mo>∆</m:mo> <m:msubsup> <m:mi>S</m:mi> <m:mi>m</m:mi> <m:mrow> <m:mn>0</m:mn> <m:mtext> </m:mtext> </m:mrow> </m:msubsup> </m:mrow> </m:math> <jats:tex-math>${increment}{S}_{m}^{0hspace{0.17em}}$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_tsd-2023-2564_ineq_002.png\" /> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"> <m:mrow> <m:mo>∆</m:mo> <m:msubsup> <m:mi>G</m:mi> <m:mi>m</m:mi> <m:mn>0</m:mn> </m:msubsup> </m:mrow> </m:math> <jats:tex-math>${increment}{G}_{m}^{0}$</jats:tex-math> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"graphic/j_tsd-2023-2564_ineq_003.png\" /> </jats:alternatives> </jats:inline-formula> have been estimated using a “pseudo-phase separation model” to understand the contribution of the chemical and de-solvation part in the micellization process. Furthermore, the enthalpy-entropy compensation plots validate the micellar stability of the studied systems.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"30 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139583824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The surface activity, intermolecular interactions and thermodynamic parameters of a mixture of a nonionic surfactant (branched-chain alkyl glycoside (IG-10)) and an anionic surfactant (alcohol ether carboxylic acid (90H)) were investigated and the wetting, emulsifying and foaming properties of the mixed system were also evaluated. The results show that there is a mutual attraction at the mixed micelles and gas/liquid interfaces formed by the two surfactants. The thermodynamic parameters show that the formation of mixed micelles from two different surfactants is a non-ideal process. In terms of application performance, the wetting ability and foaming properties of the mixed system showed good synergistic effects, with the wetting time of the mixed system being shorter than that of the two single surfactant systems and the foam stability being weaker than that of the single system. The best emulsifying capacity was obtained when the mass fraction of 90H was 50 %.
{"title":"Study on the properties of branched-chain alkyl glycoside nonionic surfactant and anionic surfactant in a mixed system","authors":"Jiahao Li, Liang Bai, Xiuquan Yang, Yunqin Qi, Yuan Zhou, Zhiyu Wu, Ziyu Qin","doi":"10.1515/tsd-2023-2556","DOIUrl":"https://doi.org/10.1515/tsd-2023-2556","url":null,"abstract":"The surface activity, intermolecular interactions and thermodynamic parameters of a mixture of a nonionic surfactant (branched-chain alkyl glycoside (IG-10)) and an anionic surfactant (alcohol ether carboxylic acid (90H)) were investigated and the wetting, emulsifying and foaming properties of the mixed system were also evaluated. The results show that there is a mutual attraction at the mixed micelles and gas/liquid interfaces formed by the two surfactants. The thermodynamic parameters show that the formation of mixed micelles from two different surfactants is a non-ideal process. In terms of application performance, the wetting ability and foaming properties of the mixed system showed good synergistic effects, with the wetting time of the mixed system being shorter than that of the two single surfactant systems and the foam stability being weaker than that of the single system. The best emulsifying capacity was obtained when the mass fraction of 90H was 50 %.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139583828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The salt blockage layer formed in the wellbore during the development of high salinity oil and gas fields has a serious impact on the safety of oil and gas production of the oil and gas fields. CaCO3 is the main component of scale in high salinity oil and gas fields. Herein, focusing on CaCO3 as an example, the precipitation and scaling process as well as the change of crystalline form of CaCO3 under different temperature and salinity conditions were studied. The effects of two addition methods of organic chelating agent on the solubilization and dislodgement of CaCO3 under high salinity conditions were also explored. The optimal concentration of organic chelating agent is determined to be 1 % and 5 % for solubilization and dislodgement, respectively. It was found that the solubilization is achieved by inhibiting the stable and difficult to treat calcite crystal phase to generate more irregular and more dispersed aragonite CaCO3. Organic chelating agent contains a large number of carboxyl groups in its molecules, which can be adsorbed onto the surface of CaCO3 crystals through electrostatic adsorption. By chelating Ca2+ in stable and difficult to treat calcite CaCO3, the further ordered growth of the crystals is prevented, causing lattice distortion or large crystal rupture, thereby achieving dislodgement. This study will provide theoretical and technical support for the solubilization and dislodgement of salt blockage layer in wellbore at high salinity conditions.
{"title":"Study on the scale inhibition performance of organic chelating agent aided by surfactants on CaCO3 at high salinity condition","authors":"Xiaolong Li, Juantao Zhang, Junping Zhang, Danping Li, Suicheng Chang, Zigang Lei","doi":"10.1515/tsd-2023-2549","DOIUrl":"https://doi.org/10.1515/tsd-2023-2549","url":null,"abstract":"The salt blockage layer formed in the wellbore during the development of high salinity oil and gas fields has a serious impact on the safety of oil and gas production of the oil and gas fields. CaCO<jats:sub>3</jats:sub> is the main component of scale in high salinity oil and gas fields. Herein, focusing on CaCO<jats:sub>3</jats:sub> as an example, the precipitation and scaling process as well as the change of crystalline form of CaCO<jats:sub>3</jats:sub> under different temperature and salinity conditions were studied. The effects of two addition methods of organic chelating agent on the solubilization and dislodgement of CaCO<jats:sub>3</jats:sub> under high salinity conditions were also explored. The optimal concentration of organic chelating agent is determined to be 1 % and 5 % for solubilization and dislodgement, respectively. It was found that the solubilization is achieved by inhibiting the stable and difficult to treat calcite crystal phase to generate more irregular and more dispersed aragonite CaCO<jats:sub>3</jats:sub>. Organic chelating agent contains a large number of carboxyl groups in its molecules, which can be adsorbed onto the surface of CaCO<jats:sub>3</jats:sub> crystals through electrostatic adsorption. By chelating Ca<jats:sup>2+</jats:sup> in stable and difficult to treat calcite CaCO<jats:sub>3</jats:sub>, the further ordered growth of the crystals is prevented, causing lattice distortion or large crystal rupture, thereby achieving dislodgement. This study will provide theoretical and technical support for the solubilization and dislodgement of salt blockage layer in wellbore at high salinity conditions.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"41 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139500553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biao Wang, Yu Su, Leilei Zhang, Jingwei Yang, Gen Li, Keliang Wang
In this paper, in order to study the effect of emulsification on the oil displacement of the system, several polymer, surfactant/polymer (S/P) and alkali/surfactant/polymer (A/S/P) systems were prepared for experiments. Firstly, the interfacial tension of each system was investigated. After the emulsion was prepared, the droplet size was observed by microscope and the intensity of the backscattered light during the destabilisation process of the emulsion was tested with the stability analyser. The TSI value was calculated to evaluate the stability of the emulsion. Finally, the Berea core displacement experiment (chemicals are used to displace oil from the core) was carried out to test the ability to enhance the oil recovery. The experimental results show that the emulsion formed by the A/S/P system with the simulation oil has the best stability. The chemical displacement recovery is the highest, which is 32.15 %. The emulsion stability of the S/P system is second, and the chemical displacement recoveries are 17.03 % and 20.76 %, respectively. The polymer system has no interfacial activity, does not form an emulsion, and has the lowest chemical displacement recovery of 8.02 %. This shows that the deeper the degree of emulsification of the system and the more stable the emulsion, the better the oil displacement effect of the oil displacement system.
{"title":"Study on the influence of emulsification ability of oil displacement system on its chemical flooding recovery","authors":"Biao Wang, Yu Su, Leilei Zhang, Jingwei Yang, Gen Li, Keliang Wang","doi":"10.1515/tsd-2023-2546","DOIUrl":"https://doi.org/10.1515/tsd-2023-2546","url":null,"abstract":"In this paper, in order to study the effect of emulsification on the oil displacement of the system, several polymer, surfactant/polymer (S/P) and alkali/surfactant/polymer (A/S/P) systems were prepared for experiments. Firstly, the interfacial tension of each system was investigated. After the emulsion was prepared, the droplet size was observed by microscope and the intensity of the backscattered light during the destabilisation process of the emulsion was tested with the stability analyser. The TSI value was calculated to evaluate the stability of the emulsion. Finally, the Berea core displacement experiment (chemicals are used to displace oil from the core) was carried out to test the ability to enhance the oil recovery. The experimental results show that the emulsion formed by the A/S/P system with the simulation oil has the best stability. The chemical displacement recovery is the highest, which is 32.15 %. The emulsion stability of the S/P system is second, and the chemical displacement recoveries are 17.03 % and 20.76 %, respectively. The polymer system has no interfacial activity, does not form an emulsion, and has the lowest chemical displacement recovery of 8.02 %. This shows that the deeper the degree of emulsification of the system and the more stable the emulsion, the better the oil displacement effect of the oil displacement system.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"131 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139469983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Ghouas, Abdelkader Benderrag, B. Haddou, Cristophe Gourdon
Abstract This work concerns the coacervate extraction of industrial dye, namely Acid Green 9 (AG-9) from aqueous solution by nonionic surfactant Lutensol AO7 and TX-114 (readily biodegradable). Binary water/surfactant and pseudo-binary phase diagrams were plotted. The extraction results as a function of wt% of the surfactant and temperature are expressed by: percentage of solute extracted, E%, residual concentrations of solute and surfactant in the dilute phase (X s,w and X t,w respectively) and volume fraction of coacervate at equilibrium (Фc). For each parameter, whose values are determined by a design of experiments, these results are subjected to empirical smoothing in three dimensionsusing response surface methodology (RSM). The aim of this study is to find out the best compromise between E % and Фc. Under optimal conditions, the extraction extent of AG-9 reaches 98 % and 96 % using TX-114 and Lutensol AO7, respectively. The effect of Na2SO4 and CTAB addition is also studied. Finally, the possibility of recycling the surfactant is proved.
{"title":"Removal of acid dye from wastewater by cloud point extraction and regeneration of surfactant by pH regulation","authors":"H. Ghouas, Abdelkader Benderrag, B. Haddou, Cristophe Gourdon","doi":"10.1515/tsd-2023-2557","DOIUrl":"https://doi.org/10.1515/tsd-2023-2557","url":null,"abstract":"Abstract This work concerns the coacervate extraction of industrial dye, namely Acid Green 9 (AG-9) from aqueous solution by nonionic surfactant Lutensol AO7 and TX-114 (readily biodegradable). Binary water/surfactant and pseudo-binary phase diagrams were plotted. The extraction results as a function of wt% of the surfactant and temperature are expressed by: percentage of solute extracted, E%, residual concentrations of solute and surfactant in the dilute phase (X s,w and X t,w respectively) and volume fraction of coacervate at equilibrium (Фc). For each parameter, whose values are determined by a design of experiments, these results are subjected to empirical smoothing in three dimensionsusing response surface methodology (RSM). The aim of this study is to find out the best compromise between E % and Фc. Under optimal conditions, the extraction extent of AG-9 reaches 98 % and 96 % using TX-114 and Lutensol AO7, respectively. The effect of Na2SO4 and CTAB addition is also studied. Finally, the possibility of recycling the surfactant is proved.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"20 3","pages":"35 - 45"},"PeriodicalIF":1.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139395085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Amphiphilic surfactants, which are currently used mainly for cleaning purposes, are produced in large quantities from petroleum, but are often harmful to the environment and poorly biodegradable. Therefore, the importance of environmentally friendly, non-toxic and skin-friendly biosurfactants is increasing. Different types of biosurfactants exist depending on their molecular structure. Trehalolipids belong to the low molecular weight glycolipids. Compared to other microbial glycolipids, they often show different properties and performances, including inhibition and enhancement of biodegradation rates. Optimisation of their production and downstream processing is one of the major obstacles to the potential use of trehaloselipids in a range of applications. This review provides an overview of different substrates and microorganisms used for trehalose lipid production, as well as various applications in bioremediation, biomedicine and microbial enhanced oil recovery.
{"title":"An overview on trehalolipids: a promising eco-friendly bio-surfactant","authors":"Vinayak C. Khandare, C. Madankar","doi":"10.1515/tsd-2023-2521","DOIUrl":"https://doi.org/10.1515/tsd-2023-2521","url":null,"abstract":"Abstract Amphiphilic surfactants, which are currently used mainly for cleaning purposes, are produced in large quantities from petroleum, but are often harmful to the environment and poorly biodegradable. Therefore, the importance of environmentally friendly, non-toxic and skin-friendly biosurfactants is increasing. Different types of biosurfactants exist depending on their molecular structure. Trehalolipids belong to the low molecular weight glycolipids. Compared to other microbial glycolipids, they often show different properties and performances, including inhibition and enhancement of biodegradation rates. Optimisation of their production and downstream processing is one of the major obstacles to the potential use of trehaloselipids in a range of applications. This review provides an overview of different substrates and microorganisms used for trehalose lipid production, as well as various applications in bioremediation, biomedicine and microbial enhanced oil recovery.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":" 2","pages":"92 - 104"},"PeriodicalIF":1.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139392079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thomas J. Tewes, Laurence Harcq, Pauline Minot, Dirk P. Bockmühl
In addition to high cleaning performance, many consumers pay special attention to low energy and water consumption in automatic dishwashers. Eco programs are designed to effectively clean normally soiled dishes with low energy and water consumption. However, Eco programs are relatively long and consumer acceptance of programs lasting longer than 2 h is not very high. The vast majority of short programs for lightly soiled dishes consume equal to lower amounts of energy and water than Eco cycles on average. In this study, we investigate the effect of different dishwasher programs on the cleaning performance for a variety of soils using four different market detergents. The results show that the detergent has a major influence on the cleaning result, especially for short cycles and that for certain short cycle/cleaner combinations similar good results can be achieved as with Eco cycles. The data collected were also used to train predictive models to make forecasts on cleaning performance for unknown program parameter combinations, and to examine the multivariate relationships of the program parameters and the cleaners in more detail.
{"title":"Brevity is the soul of wit – how time, temperature and detergent choice impact the cleaning performance in domestic dishwashers","authors":"Thomas J. Tewes, Laurence Harcq, Pauline Minot, Dirk P. Bockmühl","doi":"10.1515/tsd-2023-2563","DOIUrl":"https://doi.org/10.1515/tsd-2023-2563","url":null,"abstract":"In addition to high cleaning performance, many consumers pay special attention to low energy and water consumption in automatic dishwashers. Eco programs are designed to effectively clean normally soiled dishes with low energy and water consumption. However, Eco programs are relatively long and consumer acceptance of programs lasting longer than 2 h is not very high. The vast majority of short programs for lightly soiled dishes consume equal to lower amounts of energy and water than Eco cycles on average. In this study, we investigate the effect of different dishwasher programs on the cleaning performance for a variety of soils using four different market detergents. The results show that the detergent has a major influence on the cleaning result, especially for short cycles and that for certain short cycle/cleaner combinations similar good results can be achieved as with Eco cycles. The data collected were also used to train predictive models to make forecasts on cleaning performance for unknown program parameter combinations, and to examine the multivariate relationships of the program parameters and the cleaners in more detail.","PeriodicalId":22258,"journal":{"name":"Tenside Surfactants Detergents","volume":"9 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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