Article
Chemistry, Physical
Javed Masood Khan, Priyankar Sen, Ajamaluddin Malik, Md Tabish Rehman, Mohamed F. AlAjmi, Anwar Ahmed, Osama Hamdan Ali Alghamdi, Aqeel Ahmad, Mohammad Z. Ahmed, Rizwan Hasan Khan, Md Khalid Anwer
Summary: The cationic Gemini surfactant 14-4-14 induces aggregation in BLC, affecting its secondary and tertiary structures and forming amyloid aggregates.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Spectroscopy
Jeenat Aslam, Irfan Hussain Lone, Farah Ansari, Afroz Aslam, Ruby Aslam, Mohd Akram
Summary: The interaction between pyridinium based gemini surfactants and bovine serum albumin was studied using a combination of experimental and computational techniques, revealing the impact of the surfactants on the protein structure and secondary structure.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Thermodynamics
Yunpeng Yang, Haolan Tan, Jiaqing Zhang, Fengju Shang, Fei Xiao, Kaiyuan Li
Summary: This study systematically investigated the surface activity and foam performance of mixed solutions of short-chain fluorocarbon Gemini surfactant (Gemini) with anionic, zwitterionic, and non-ionic hydrocarbon surfactants. The results demonstrated that Gemini exhibited excellent surface activity and foam properties. The combination of Gemini with three ionic hydrocarbon surfactants showed a synergistic effect, and increasing the concentration of Gemini improved foam performance. Gemini enhanced foam performance by enhancing the alignment of surface adsorbed molecules at the liquid-air interface. Among the mixed systems, Gemini/SDS exhibited the highest foam stability.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Chemistry, Physical
Tsukasa Morita, Shiho Yada, Tomokazu Yoshimura
Summary: The dynamic surface tensions of gemini surfactants and trimeric surfactants were measured to analyze the effects of molecular structures and surfactant concentration. It was found that gemini surfactants with cyclic structures exhibited slower interfacial adsorption, while trimeric surfactants had lower adsorption rate due to their bulkiness. The diffusion rate of trimeric surfactants increased with the spacer chain length, while linear-type surfactants adsorbed faster and star-type surfactants adsorbed slower at the air/water interface.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Chemical
Haifeng Tang, Jiamei Song, Mengling Zha, Jincheng He, Zhihu Yan
Summary: In this study, the structure-activity relationship between the molecular structure of Gemini surfactants and foam properties was clarified for the first time. The research results show that Gemini surfactants with sulfonic acid head group have excellent foam properties. Additionally, foam properties increase with the increase of hydrophobic tail chain length and decrease with the increase of spacer group length.
Article
Chemistry, Physical
Erol Akpinar, Nazli Uygur, Gokhan Topcu, Oleg D. Lavrentovich, Antonio Martins Figueiredo Neto
Summary: This study investigated the interaction between Sunset Yellow and dodecyltrimethylammonium bromide (DTMABr) at different concentrations, revealing gemini surfactant behavior of DTMABr at high dye concentrations and J-aggregations of Sunset Yellow in water. Additionally, H-aggregates of Sunset Yellow were formed at low concentrations in the presence of DTMABr, while J-aggregations were observed at high concentrations.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Young Jin Choi, Nam-Kyun Kim, Young-Wun Kim, Jeong-Hoon Kim, Ho-Cheol Kang
Summary: The synthesis of a new type of symmetric gemini light-sensitive cationic surfactants, qDAZDA-n series, has been achieved. The surfactants showed low CMC range and were convertible between trans and cis forms under UV and visible light exposure. Contact angle measurements were conducted to study the surfactants' wettability. The synthesized surfactants were compared with commonly used commercial surfactants, SLES-3 and DBS.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Malik Abdul Rub, Mohmad Shafi Sheikh, Farah Khan, Naved Azum, Yousef G. Alghamdi, Abdullah M. Asiri
Summary: The study shows synergism between PMT and 16-E-2-16 in various media, with mixed micelles formation enhancing solubility and permeability for drug delivery purposes across the membrane.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Seungyeop Baek, Dongwook Shin, Gyuchang Kim, Ajeong Lee, Jungpil Noh, Byeongkeun Choi, Sunchul Huh, Hyomin Jeong, Yonmo Sung
Summary: The study investigated the influence of surfactants on the dispersion, stability, and thermophysical characteristics of 0.5%-alumina/distilled water nanofluid. Results showed that different types and blending ratios of surfactants can lead to varied properties in nanofluids, with amphoteric surfactants causing instability in alumina nanofluids. The research indicates that surfactants play a significant role in determining the properties of alumina nanofluids.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Guangyu Zeng, Chuanrong Zhong, Xiangcheng Wang, Xigao He, Enzhe Pu
Summary: A new Gemini hybrid surfactant DFCS was developed to enhance the salt resistance and interface activity of fluoro-nated surfactants. It can be used as a cleanup additive in fracturing and an active agent in water flooding for shale and superlow-permeability sandstone reservoirs. DFCS exhibited lower interface tensions than current fluorinated surfactants at high salinities, showed temperature resistance below 70 degrees Celsius, and had large molecular area and strong spontaneity in micelle formation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Simeng Gao, Xinxin Bao, Lintao Yu, Hainan Wang, Junyan Li, Xi Chen
Summary: This study investigates the aggregation behavior and interfacial performance of a series of quasi-gemini surfactants at the oil/water interface using molecular dynamics simulation. The results suggest that subtle structural variations in the surfactants can significantly affect interfacial properties, with 3-C12S(NP) showing the best overall performance in reducing interface tension. These findings are valuable for the design of high-performance surfactants for oil displacement.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Wanju Zhang, Yanbo Qu, Weixiang Lv, Yichang Li
Summary: The potential and prospect of cationic/anionic surfactant mixtures in enhanced oil recovery using sulfonate Gemini surfactant and bisquaternary ammonium salt were investigated. The study found that these mixtures exhibited superior interfacial activity and could effectively reduce the interfacial tension at the oil-water interface under certain conditions.
JOURNAL OF SURFACTANTS AND DETERGENTS
(2023)
Article
Chemistry, Physical
Sayantan Halder, Rishika Aggrawal, Subit K. Saha
Summary: This work demonstrates the reverse refolding process of unfolded bioconjugated proteins using beta-cyclodextrin (beta-CD). The compressed protein bioconjugates relax in the presence of a low concentration of beta-CD and then refold once remaining surfactant molecules are removed at a higher concentration of beta-CD. The secondary/tertiary structural changes of the refolded protein have been determined through spectroscopic analysis. This study provides insights into the protein folding process and its potential applications in materials science.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Biochemistry & Molecular Biology
Ruiguo Wang, Xinxin Xu, Xiaodi Shi, Junjie Kou, Hongjian Song, Yuxiu Liu, Jingjing Zhang, Qingmin Wang
Summary: Improving the utilization rate of pesticides by adding appropriate surfactants is an effective way to enhance their effectiveness. This study synthesized several short-chain fluorinated surfactants and evaluated their surface activities. Gemini surfactants were found to have lower critical micelle concentrations, higher diffusivities, and better wetting abilities compared to their monomeric counterparts. Using a gemini surfactant as a synergist significantly improved the efficacy of the herbicide glyphosate.
Article
Chemistry, Physical
Pouneh Sadat Pourhosseini, Rezvaneh Ghasemitabesh, Mitra Pirhaghi, Sara Fayazzadeh, Ali Akbar Saboury, Farhood Najafi
Summary: In this study, three novel cationic gemini surfactants with urethane bonds and polyethylene glycol (PEG) blocks were synthesized and characterized. The surfactants were found to have significant effects on the stability and structural changes of insulin, with potential applications as protein delivery systems.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)