Article
Chemistry, Physical
Trang Vu, Peter Koenig, Mike Weaver, Howard D. Hutton, Gerald B. Kasting
Summary: The study focused on the thickening properties of sulfate-free and amino acid-based surfactant systems, revealing mechanisms behind the differences in thickening response compared to traditional sulfate-based formulations. Through experimental analysis of various thickeners, including cationic surfactants and inorganic counterions, insights were gained into the viscoelastic properties and dynamics of micelles in these systems, shedding light on the reasons for their differing thickening behaviors.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Physics, Fluids & Plasmas
Prasad Sonar, Hiroaki Katsuragi
Summary: This study experimentally investigates crack formation and decompaction-wave propagation in a vibrated powder bed consisting of 5 μm glass beads. The vibrated powder bed demonstrates three distinct phases under different vibration conditions: consolidation, static fracture, and dynamic fracture. Notably, when the powder bed is strongly vibrated, an upward wave propagation is observed in the dynamic fracture regime. An interesting finding is that in fine cohesive powders, the decompaction-wave propagation speed, normalized to gravitational speed, is independent of the vibration strength. This suggests that the wave propagation speed is influenced by the balance between gravity and cohesion effect rather than vibration strength. The universality of the wave propagation phenomenon in coarser and low-density granular powders is also explored.
Article
Spectroscopy
Changsheng Gan, Rong Cheng, Kunliang Cai, Xiaonan Wang, Chenkun Xie, Tiantian Xu, Chuanxun Yuan
Summary: The interactions between calf thymus DNA and a series of glucose-based cationic gemini surfactants with different spacer length were studied. The results showed that all the surfactants could efficiently interact with DNA, causing changes in its absorption intensity and conformation. Surfactant 1c exhibited the most significant effect, compacting the DNA molecules to a smaller size. These findings shed light on the potential applications of cationic gemini surfactants in gene delivery.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Geochemistry & Geophysics
Ivan Utkin, Andrey Afanasyev
Summary: The study presents a mathematical model of nonreactive fluid flow in a porous medium and simulates magmatic fluid transport in the Earth's upper crust. The results show that decompaction weakening influences flow and convection in different porosity zones, with magmatic fluid transfer mainly occurring through the roofs of high-porosity lenses.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Chemistry, Multidisciplinary
Eli Sloutskin, Lilach Tamam, Zvi Sapir, Benjamin M. Ocko, Colin D. Bain, Ivan Kuzmenko, Thomas Gog, Moshe Deutsch
Summary: The surface adsorption of ionic surfactants is critical for various phenomena in life sciences and technological applications. However, the direct structural experimental studies of noncrystalline surface-adsorbed films are limited, resulting in uncertainties about the charge density and theoretical models. This study employs X-ray reflectivity and neutron reflectivity data to determine the charge distribution and confirms the consistency with a compact Stern layer model of condensed counterions, providing insights into the adsorption thermodynamics and resolving the adsorption parameters.
Article
Biochemistry & Molecular Biology
Maksym Fizer, Oksana Fizer
Summary: In this study, the electrostatic potential maxima and partial atomic charges of cetylpyridinium cation were reported, with the main tendencies in charge deviations discussed. Different methods and functionals were used to calculate the partial atomic charges, leading to variations in charge distribution along the cetyl chain.
JOURNAL OF MOLECULAR MODELING
(2021)
Article
Polymer Science
Thomke Belthle, Marcus Lantzius-Beninga, Andrij Pich
Summary: In this study, hydrophilic-to-amphiphilic alkylated N-vinylimidazolium based ionic liquid monomers with various counter anions were incorporated into N-vinylcaprolactam (VCL) based microgels via precipitation polymerization, and their properties were investigated. Two strategies, pre-functionalization and post-functionalization, were applied and compared. Different counterions and alkyl chain lengths affected the size, swelling behavior, and electrophoretic mobility of the resulting microgels. The pre-functionalization approach allowed for the formation of anisotropic microgels with restricted swelling. The results of this study have implications for the controlled design of functional microgels for various applications.
Article
Polymer Science
Thu Thao Pham, Shin-ichi Yusa
Summary: Poly(4-((3-methacrylamidopropyl)dimethylammonium)butane-1-sulfonate) (PSBP) exhibited upper critical solution temperature (UCST) behavior in aqueous solutions, which could be controlled by adjusting the polymer and NaCl concentrations. PSBP formed a water-soluble ion complex with cetyltrimethylammonium bromide (CTAB) via attractive electrostatic interaction. The stoichiometrically neutral-charge PSBP/CTAB complex exhibited UCST behavior in aqueous solutions.
Article
Chemistry, Physical
Qishun Tang, Michael Rubinstein
Summary: This study presents a scaling model for the concentration profiles of both condensed and free counterions in solutions of charged nanoparticles, considering different charge valences, nanoparticle sizes, and salt concentrations. The distribution of counterions near charged particles is determined by the condensation parameter and various factors, leading to three different regimes of counterion distribution. The condensed counterions are not bound to the nanoparticle surface, but localized within a condensed counterion zone near the charged particle, whose thickness varies with different parameters.
Article
Chemistry, Multidisciplinary
Risa Kawai, Shiho Yada, Tomokazu Yoshimura
Summary: The study investigated the adsorption and aggregation behavior of different quaternary-ammonium-salt-type amphiphilic compounds with various surfactants, revealing that the surface tension of the mixtures depended on the surfactant structure. The composition and type of mixtures were found to affect the structure of the micelles formed.
Article
Engineering, Environmental
Yan Bao, Lu Gao, Feitong Wang, Jianzhong Ma
Summary: Gemini surfactants are in high demand globally for their potential applications in paper, medical hygiene, and textile industries. This study focuses on the design and synthesis of Gemini surfactants integrated with biosafety and multi-functionality for environmental protection and cost-effective industrial processes. The effects of three heterocyclic cationic Gemini surfactants with different hydrophilic groups on antibacterial, dispersion, and fixation properties in leather processing are investigated.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Review
Chemistry, Physical
Rui A. Goncalves, Krister Holmberg, Bjorn Lindman
Summary: This paper provides an overview of the self-assembly, intermolecular interactions, and properties of cationic surfactants, as well as their interactions with other solutes and surfaces. It also discusses the versatile properties of single-chain and double-chain cationic surfactants, as well as other special cationic surfactants, and their relationship with skin toxicity and environmental factors. Furthermore, the paper explores the mixing effects of cationic surfactants with other surfactants, polymers, proteins, and DNA, and outlines established and emerging applications of cationic surfactants.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Ana M. Bernal-Martinez, Cesar A. Angulo-Pachon, Francisco Galindo, Juan F. Miravet
Summary: This paper presents a study on the aggregation of cationic bolaamphiphilic molecules into vesicles. It was found that vesicles can be formed at pH 4, and they have the capability of loading hydrophobic cargos and releasing them in reductive environments. These molecules are only fully protonated and prone to vesicle formation at acidic pH, making them a promising alternative for gastrointestinal delivery.
Article
Chemistry, Physical
Zoya Zaheer, Samia A. Kosa, Mohammad Osama, Mohd Akram
Summary: The study investigated the binding capabilities of flurbiprofen drug with a new type of gemini surfactant using spectroscopic methods, revealing significant interaction and a correlation with the chain length and critical micellar concentration of the surfactant.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Biochemistry & Molecular Biology
Pamela M. St John, Kathleen Westervelt, Adam Rimawi, Tetsuya Kawakita
Summary: This study measured the binding between a cationic surfactant and single stranded DNA of different lengths using fluorescence polarization, obtaining dissociation constants for the aggregates formed. Short DNA strands were unable to form the same size aggregates, and salt concentration and temperature affected aggregate formation.
BIOPHYSICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Lei Feng, Lu Xu, Jingcheng Hao, Shuli Dong
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2016)
Article
Biophysics
Ling Wang, Lu Xu, Guihua Li, Lei Feng, Shuli Dong, Jingcheng Hao
COLLOIDS AND SURFACES B-BIOINTERFACES
(2016)
Article
Chemistry, Physical
Lu Xu, Mengjun Chen, Jingcheng Hao
JOURNAL OF PHYSICAL CHEMISTRY B
(2017)
Article
Chemistry, Multidisciplinary
Lu Xu, Shuli Dong, Jingcheng Hao, Jiwei Cui, Heinz Hoffmann
Article
Engineering, Environmental
Yi Yang, Lu Xu, Susan Dekkers, Lijie Grace Zhang, Flemming R. Cassee, Yi Y. Zuo
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2018)
Article
Materials Science, Biomaterials
Chen Li, Lu Xu, Yi Y. Zuo, Peng Yang
BIOMATERIALS SCIENCE
(2018)
Article
Chemistry, Physical
Lu Xu, Lei Feng, Shuli Dong, Jingcheng Hao, Qun Yu
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2018)
Article
Biophysics
Xuan Bai, Lu Xu, Jenny Y. Tang, Yi Y. Zuo, Guoqing Hu
BIOPHYSICAL JOURNAL
(2019)
Article
Biophysics
Lu Xu, Yi Yang, Yi Y. Zuo
BIOPHYSICAL JOURNAL
(2020)
Article
Physiology
Lu Xu, Yi Yang, Jennifer Michelle Simien, Christopher Kang, Guangle Li, Xiaojie Xu, Ellinor Haglund, Rui Sun, Yi Y. Zuo
Summary: With the increasing prevalence of electronic cigarette use, it is important to understand the biological risks and pathophysiology of health conditions related to e-cigarettes, especially among youth. This study found that menthol, a flavoring used in e-cigarettes, played a predominant role in inhibiting the biophysical function of pulmonary surfactant.
AMERICAN JOURNAL OF PHYSIOLOGY-LUNG CELLULAR AND MOLECULAR PHYSIOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Lulin Hu, Yi Yang, Jingcheng Hao, Lu Xu
Summary: Researchers have developed a biomimetic hydrogel made of graphene oxide and water that can respond to changes in pH and temperature, mimicking the properties of natural organisms like muscles and sea cucumbers. The hydrogel also serves as a smart lubricant, with low friction and no toxic ingredients.
Article
Chemistry, Physical
Yi Yang, Hong Sun, Bo Zhang, Lulin Hu, Lu Xu, Jingcheng Hao
Summary: This study successfully integrates mechanical strength and self-recovery into a colloidal hydrogel system of aluminium hydroxide nanosheets. The hydrogel exhibits excellent elasticity and stiffness, as well as high self-healing efficiency. It also demonstrates good lubrication and anti-corrosion properties.
Article
Chemistry, Multidisciplinary
Siwei Chen, Jinyu Wang, Hongsheng Lu, Lu Xu
Summary: In this study, simple-component, switchable, and multifunctional Pickering emulsions were designed and prepared using green lubricating base oil polydimethylsiloxane, water, and modified silica nanoparticles. These emulsions exhibit high stability, lubricity, and anticorrosion properties. Their magneto-responsiveness suggests potential applications as smart lubricants, and their reversible emulsification and demulsification enable effective recycling and reuse of the composite nanoparticles.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Mechanical
Weiyan Yu, Jian Liu, Yi Yang, Jingcheng Hao, Lu Xu
Summary: We created an organohydrogel lubricant with effective anti-freezing, anti-volatile and anti-corrosive performances using a ternary mixture of colloidal silica nanoparticles, glycerol, and water. The hydrogel could achieve a very low coefficient of friction at room temperature and maintain its lubricity even at -80 degrees C. The lubrication mechanism involved the formation of a physically protective film and the rolling and repairing actions of silica particles in synergy with the presence of glycerol.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Green & Sustainable Science & Technology
Hai-Xia Yu, Xinxin Yu, Siwei Chen, Jingcheng Hao, Lu Xu
Summary: This study presents a dual-responsive and versatile lubricating emulsion composed solely of water, eco-friendly ester base oil, and synthetic cationic emulsifier. The emulsion exhibits efficient anticorrosion, antibiosis, and light-and magneto-responsiveness, thanks to the unique surfactant with azobenzene moiety, [CeCl3Br]- anion, and methylimidazole head-group. By exploiting the reversible photo-triggered hydrophobicity of the surfactant, an on-demand separation and recycling of emulsion components can be achieved, accompanied by a significant reduction in friction. Additionally, the emulsion lubricant demonstrates magnetically controlled migration and adaptivity to high normal loads, making it promising for applications in various industrial systems and smart devices.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Biophysics
Cristina Potrich, Anna Pedrotti, Cecilia Pederzolli, Lorenzo Lunelli
Summary: This study developed different functional surfaces for capturing exosomes and verified their effectiveness through experiments. Among them, the negatively-charged surface performed the best, capturing a large number of exosomes and successfully analyzing their biomarkers.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Brojendra Nath Saren, Srushti Mahajan, Mayur Aalhate, Rahul Kumar, Essha Chatterjee, Indrani Maji, Ujala Gupta, Santosh Kumar Guru, Pankaj Kumar Singh
Summary: This study developed P-selectin-targeted dasatinib nanoparticles coated with chitosan and fucoidan (DST-CH-FUC-NPs), which showed sustained release, reduced hemolytic potential, increased cytotoxicity and cellular uptake compared to free dasatinib. These nanoparticles also demonstrated enhanced ROS production, mitochondrial membrane potential damage, apoptosis induction, cell migration inhibition, and disruption of lysosomal membrane integrity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Weiping Deng, Xiaohui Li, Ya Li, Zhongbing Huang, Yulin Wang, Ning Mu, Juan Wang, Tunan Chen, Ximing Pu, Guangfu Yin, Hua Feng
Summary: This study demonstrates the importance of chirality in nerve repair by constructing a GO-phenylalanine derivative hydrogel system. In vivo experiments show that the dextro group significantly improves functional recovery and histological restoration in rat sciatic nerve repair models. The doped GO promotes angiogenesis and myelination. These results suggest that chirality plays a crucial role in promoting nerve regeneration.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Xiaoyan Wang, Jin Gao, Yu Gao, Linlin Zhang, Congchao Xu, Qintong Li, Lin Li, Jianliang Xue
Summary: In this study, a highly effective surfactant producer strain, Bacillus Cereus GX7, was isolated from the oil tank bottom sludge of Shengli Oil Field in China. The biosurfactant produced by GX7 was identified as surfactin, a lipopeptide surfactant, through TLC, FT-IR, and LC-MS/MS analysis. The fermentation process of GX7 was optimized using single-factor experiments, focusing on the composition of fermentation medium and fermentation conditions. Glucose and peptone were found to be the best carbon and nitrogen sources, and the optimum temperature, inoculum amount, pH, rotation speed, and fermentation time for the strain were determined to be 30°C, 1%, 7.5, 150 rpm, and 48 h, respectively. After optimization, the surface tension and emulsification index of the fermentation broth were 26.84 mN/m and 57.84%, respectively. Furthermore, the biosurfactant produced by GX7 demonstrated good stability over a wide range of temperature, pH, and salt concentration.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Rodney Marcelo do Nascimento, Christine Grauby-Heywang, Houssem Kahli, Nesrine Debez, Laure Beven, Ivan Helmuth Bechtold, Touria Cohen Bouhacina
Summary: This article presents a theoretical model based on thermodynamic rules to assess the early stages of bacterial biofilm formation on different material surfaces. By utilizing morphological characteristics of bacteria and Atomic Force Microscopy images, the model generates a dataset of energetically minimized states, which can be correlated with bacterial adhesion states.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Filipa A. L. S. Silva, Licinia Timochenco, Raquel Costa-Almeida, Jose Ramiro Fernandes, Susana G. Santos, Fernao D. Magalhaes, Artur M. Pinto
Summary: The study demonstrates that by photoreducing nanosized graphene oxide using ultraviolet radiation, nanometric particles with high light-to-heat conversion efficiency and water stability can be obtained. These nanomaterials exhibit high absorption in the near-infrared region and show no cytotoxicity towards human cells, indicating their potential for safe therapy.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
D. Costa, V. De Matteis, F. Treso, G. Montani, M. Martino, R. Rinaldi, M. Corrado, M. Cascione
Summary: This review primarily discusses the relationship between contact lens discomfort (CLD) and the surface properties of contact lenses (CLs), specifically the coefficient of friction (CoF). The review emphasizes the importance of introducing a standardized protocol for measuring CoF and calls for a more precise evaluation of the relationship between surface properties and comfort in CLs users.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Debdip Brahma, Tamal Sarkar, Rupal Kaushik, Akshay Narayan Sarangi, Amar Nath Gupta
Summary: This in-vitro study evaluates the effect of reactive oxygen species (ROS) on the structural rearrangement of elastin. The results show that oxidative stress leads to a decrease in protein size and changes in secondary structure, potentially promoting protein aggregation. This study is important for therapeutics aiming to prevent elastin degradation and aging.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Xin Yang, Qiang Wang, Chaoxi Yan, Degang Huang, Yinchang Zhang, Huazheng He, Shouliang Xiong, Congming Li, Pingbo Chen, Tingjun Ye, Dan Hu, Lei Wang
Summary: This study presents a practical and effective strategy to improve osseointegration in patients with osteoporosis. By coating titanium implants with polydopamine followed by strontium modification, the bi-functional implants promote bone regeneration and immune regulation. The results show good biocompatibility, sustained release of strontium ions, and stable osseointegration between bone tissues and implants.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Sengwang Fu, Jianping Zhu, Zhijun Jiang, Yue Cao, Yufei Chen, Lihao Zhang, Sunlong Li, Weipeng Lu, Chengbin Miao, Qing He, Qi Li, Weixing Zhang, Lehao Ren, Yachun Li, Hongchao Shi, Cihui Liu
Summary: Effective management of biofluids is crucial for in vivo surgical interventions. Recent advances include self-sealing needles, drug-eluting stents, and shear-thinning hydrogels. However, complications associated with intestinal mucosal injury and secondary damage still persist. In this study, researchers developed an interpenetrating Janus wettability stent coating that enables unidirectional draining of excessive biofluid. They also demonstrated directional biofluid movement using a self-pumping dressing with potential applications in biofluid collection and disease diagnosis through metal ion detection. This integrated system presents an opportunity for designing wound dressings with effective biofluid management and metal ion detection capabilities.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Maryam Hassani, Mojtaba Kamankesh, Mazda Rad-Malekshahi, Kobra Rostamizadeh, Farhad Rezaee, Ismaeil Haririan, Seyed Mojtaba Daghighi
Summary: Bacterial adhesion and biofilm formation on the surface of biomaterial implants is a critical problem, and a polymer brush coating with antiadhesive and antimicrobial properties has proven to be highly effective in resolving this issue.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Huaihong Zhang, Na Liu, Yuting Zhang, Hui Cang, Zhaosheng Cai, Ziqun Huang, Jun Li
Summary: A functionalized cationic polymer, CR-PQAC, was designed and synthesized for photothermal enhanced antimicrobial therapy. The CR-PQAC nanoparticles exhibited significant antibacterial activity and low cytotoxicity against mammalian cells.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Ipsita Sahu, Priyadarshi Chakraborty
Summary: Peptide nanotechnology bridges the gap between materials and biological worlds by utilizing self-assembly of short-peptide building blocks. Hydrogels engineered from these short peptides show great potential in biomedical applications, but their weak mechanical properties and limited functional diversity need to be addressed. Nanoengineering the networks of these hydrogels by incorporating small molecules, polymers, and inorganic/carbon nanomaterials can enhance their mechanical properties and expand their functional diversity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Hao Wei, Yajun Gu, Ao Li, Panpan Song, Dingding Liu, Feihu Sun, Xiaofeng Ma, Xiaoyun Qian
Summary: In this study, a stable three-dimensional conductive hydrogel was prepared by cross-linking MXenes to Matrigel hydrogel. The conductive hydrogel promotes the proliferation and differentiation of NSCs, providing new strategies for neural tissue engineering.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Yue Zhong, Xiaoli Ge, Juan Zhang, Qun Wei, Feng Wang, Yongke Zhong
Summary: The effect of oxygenic groups on the hemocompatibility of activated carbon was studied through liquid-phase oxidation and subsequent heat treatment. Results showed that the presence of oxygenic groups improved hemocompatibility, while their removal decreased it.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)