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The use of surfactants in the cleaning of works of art
Publication date: Available online 17 January 2020Source: Current Opinion in Colloid & Interface ScienceAuthor(s): David Chelazzi, Romain Bordes, Rodorico Giorgi, Krister Holmberg, Piero BaglioniAbstractSurfactants have been historically used for cleaning artifacts, but only in the last decades serendipitous approaches were replaced by research in the field of soft matter and colloid science. Surfactants are components of nanostructured fluids, which were assessed for the removal of soil and aged coatings from paintings, and are fundamental in processes that range from the inclusion of grime in micelles, to the swelling an...
Source: Current Opinion in Colloid and Interface Science - January 18, 2020 Category: Chemistry Source Type: research

The importance of force in microbial cell adhesion
Publication date: Available online 12 January 2020Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Sofiane El-Kirat-Chatel, Audrey Beaussart, Marion Mathelié-Guinlet, Yves F. DufrêneAbstractMicrobes have evolved sophisticated strategies to colonize biotic and abiotic surfaces. Forces play a central role in microbial cell adhesion processes, yet until recently these were not accessible to study at the molecular scale. Unlike traditional assays, atomic force microscopy (AFM) is capable to study forces in single cell surface molecules and appendages, in their biologically-relevant conformation and environmen...
Source: Current Opinion in Colloid and Interface Science - January 14, 2020 Category: Chemistry Source Type: research

Forces between a hard surface and an air–aqueous interface with and without films
Publication date: June 2020Source: Current Opinion in Colloid & Interface Science, Volume 47Author(s): Cathy E. McNamee, Shinpei YamamotoAbstractThe adsorption of particles to air–aqueous interfaces is vital in many applications, such as mineral flotation and the stabilization of food foams. The forces in the system determine whether a particle will attach to an air–aqueous interface. The forces between a particle and an air–aqueous interface are influenced by Derjaguin–Landau–Verwey–Overbeek forces (i.e. van der Waals and electrostatic forces), non–Derjaguin–Landau–Verwey–Overbeek forces (e.g. hydroph...
Source: Current Opinion in Colloid and Interface Science - January 12, 2020 Category: Chemistry Source Type: research

Surface forces between bottlebrush polymer layers
Publication date: June 2020Source: Current Opinion in Colloid & Interface Science, Volume 47Author(s): Xiaoyan LiuAbstractIn this review, I summarize recent experimental investigations of surface and friction forces between bottlebrush structure macromolecules including biolubricants and biomimetic ones by direct force measurements. I also discuss recent experimental investigations of synergy in lubrication in which a question, ‘How do lubricants act together?’, is aimed to be answered. Lastly, challenges and opportunities for developing efficient lubricating systems are outlined. (Source: Current Opinion in Colloid and Interface Science)
Source: Current Opinion in Colloid and Interface Science - January 12, 2020 Category: Chemistry Source Type: research

Water-in-Salt Electrolytes: An Interfacial Perspective
Publication date: Available online 7 January 2020Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Ming Chen, Guang Feng, Rui QiaoAbstractLiquid electrolytes with high ionic conductivity, high transference number for the target ions, and excellent electrochemical, chemical, and thermal stability are essential for electrochemical energy storage devices. Water-in-salt (WIS) electrolytes, in which the salt-water ratio is larger than one, are gaining intensive attention in the electrochemical community. Here, we review the recent work on WIS and the closely-related water-in-ionic liquids electrolytes. We highlig...
Source: Current Opinion in Colloid and Interface Science - January 9, 2020 Category: Chemistry Source Type: research

Erratic Ions: Self- and Co-Assembly of Ions of Nanometer size and of Irregular Structure
Publication date: Available online 7 January 2020Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Pavel MatějíčekAbstractThe solution behavior of some ions resembles that of surfactants. The aim of this review is to contextualize the behavior of ions with uneven structure and/or hydration shell, such as nanoions, intrinsically amphiphilic ions and ions with irregular chemical composition. Hints regarding ion-specificity and other peculiar features of less conventional ions are discussed. Such ions can exhibit ion pairing and like-charge self-assembly resembling thus amphiphilic molecules. Irregular ions ...
Source: Current Opinion in Colloid and Interface Science - January 7, 2020 Category: Chemistry Source Type: research

Solvophobicity and Amphiphilic Self-Assembly in Neoteric and Nanostructured Solvents
Publication date: Available online 1 January 2020Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Gregory G. Warr, Rob AtkinAbstractThe emergence of ionic liquids and deep eutectics as neoteric solvents that support surfactant self-assembly creates a vast new playing field for creating new forms of soft matter with distinctive properties. Solvophobic self-assembly in ionic liquids and deep eutectics has unique and novel features arising from strong interactions between constituents, high ionic strengths, and the molecular structures of the components, which can induce amphiphilic nanostructure in these non-...
Source: Current Opinion in Colloid and Interface Science - January 2, 2020 Category: Chemistry Source Type: research

Structure–activity relationship of cationic surfactants as antimicrobial agents
Publication date: February 2020Source: Current Opinion in Colloid & Interface Science, Volume 45Author(s): Chengcheng Zhou, Yilin WangAbstractCationic surfactants are widely used as antimicrobial agents in various fields. However, the widespread use of cationic surfactants has caused huge accumulation in environment, triggering the emergence of bacterial resistance. Besides, owing to the strong cytotoxicity, most of the cationic surfactants are limited in practical applications. Therefore, constant attention has been paid on how to rationally design the surfactants for achieving highly efficient antimicrobial activity at l...
Source: Current Opinion in Colloid and Interface Science - December 31, 2019 Category: Chemistry Source Type: research

The Curious Case of 12-Hydroxystearic Acid –the Dr. Jekyll & Mr. Hyde of Molecular Gelators
Publication date: Available online 27 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Anne-Laure Fameau, Michael A. RogersAbstractA comprehensive review of the features driving self-assembly of 12-hydroxystearic acid (12-HSA), a low molecular weight gelator (LMWG), and its applications in drug delivery and as other soft innovative materials are presented herein. 12-HSA is obtained via hydrogenation of ricinoleic acid naturally found in high concentrations in castor oil. The ability of 12-HSA to self-assemble is associated with the presence, position and enantiomeric purity of the hydroxy group...
Source: Current Opinion in Colloid and Interface Science - December 28, 2019 Category: Chemistry Source Type: research

Rational design, properties and applications of biosurfactants: a short review of recent advances
Publication date: Available online 28 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Kang Liu, Yawei Sun, Meiwen Cao, Jiqian Wang, Jian R. Lu, Hai XuAbstractBiosurfactants combine physicochemical properties with biological activities. Whilst biosurfactants are often expressed by microorganisms, an increasing amount is produced by chemical synthesis. As many exist in the form of homologous compounds, it is often difficult to purify biosurfactants. But this has not limited the efforts to develop their commercial applications. In this short review, we have featured the recent advances in three i...
Source: Current Opinion in Colloid and Interface Science - December 28, 2019 Category: Chemistry Source Type: research

Role of Molecular Architecture in the Modulation of Hydrophobic Interactions
Publication date: Available online 26 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Lei Xie, Diling Yang, Qiuyi Lu, Hao Zhang, Hongbo ZengABSTRACTHydrophobic interactions are ubiquitous in water-based systems, which play a central role in a variety of interfacial phenomena. Herein, the recent advances in the quantitative measurements of hydrophobic interactions at different solid/water, air/water and oil/water interfaces using surface forces apparatus (SFA) and atomic force microscope (AFM) are summarized. By the quantitative force measurements, the correlations among molecular architectures...
Source: Current Opinion in Colloid and Interface Science - December 27, 2019 Category: Chemistry Source Type: research

Non-specific interactions in biomedical applications
Publication date: Available online 20 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Vahid Adibnia, Marziye Mirbagheri, Sina Salimi, Gregory De Crescenzo, Xavier BanquyAbstractNon-specific interactions play a major role in the microscale functioning of biological units. Exploiting these interactions in design and application of biomedical systems has been beneficial in different branches of biomedicine. In this review, recently designed biomedical systems that function mainly, or partially, based on non-specific interactions, including but not limited to electrostatic, hydrophobic, and steric...
Source: Current Opinion in Colloid and Interface Science - December 21, 2019 Category: Chemistry Source Type: research

Surface Forces and Friction Tuned by Thermo-Responsive Polymer Films
Publication date: Available online 19 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Saeed Zajforoushan Moghaddam, Esben ThormannAbstractThermo-responsive polymer films have enabled the development of various functional surfaces with switchable interfacial properties. Assessing the surface forces and friction on such films is of paramount importance. On the one hand, it allows us to extract a great deal of information on the interfacial properties of the films, e.g., adhesiveness and lubricity, and how they could be tuned using different stimuli. On the other hand, surface force measurements ...
Source: Current Opinion in Colloid and Interface Science - December 20, 2019 Category: Chemistry Source Type: research

“Forces between a hard surface and an air/aqueous interface with and without films”
Publication date: Available online 20 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Cathy E. McNamee, Shinpei YamamotoAbstractThe adsorption of particles to air/aqueous interfaces is vital in many applications, such as mineral flotation and the stabilization of food foams. The forces in the system determine whether a particle will attach to an air/aqueous interface. The forces between a particle and an air/aqueous interface are influenced by Derjaguin-Landau-Verwey-Overbeek (DLVO) forces (i.e. van der Waals and electrostatic forces), non-DLVO forces (e.g. hydrophobic, hydrodynamic, structura...
Source: Current Opinion in Colloid and Interface Science - December 20, 2019 Category: Chemistry Source Type: research

Recent advances in assemblies of cyclodextrins and amphiphiles: construction and regulation
Publication date: Available online 12 December 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Kaerdun Liu, Cheng Ma, Tongyue Wu, Weilin Qi, Yun Yan, Jianbin HuangAbstractCyclodextrins (CDs) had been regarded as destructors in molecular assembly systems for a long time until CD/surfactants were found to assemble into high order structure driven by hydrogen bonding between CDs. Thereafter, intensive researches have been conducted on construction and regulation of CD/amphiphile systems. Here, we summarized the recent progress on construction and regulation of cyclodextrins and amphiphiles assembly. The s...
Source: Current Opinion in Colloid and Interface Science - December 14, 2019 Category: Chemistry Source Type: research