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Langmuir: the ACS Journal of Surfaces and Colloids

Fabiana Spadaro, Antonella Rossi, Shivaprakash N Ramakrishna, Emmanuel Lainé, Philip Woodward, Nicholas D Spencer
The discovery of the spontaneous reaction of boric oxides with moisture in the air to form lubricious H3BO3 films has led to great interest in the tribology of boron compounds in general. Despite this, a study of the growth kinetics of H3BO3 on a B2O3 substrate under controlled relative humidity (RH), has not yet been reported in the literature. Here, we describe the tribological properties of H3BO3-B2O3 glass systems after aging under controlled relative humidity over different lengths of time. A series of tribological tests has been performed applying a normal load of 15 N, at both room temperature and 100°C in Yubase 4 oil...
January 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Minyu Xiao, Joshua Jasensky, Leanna L Foster, Kenichi Kuroda, Zhan Chen
Antimicrobial peptides (AMPs) free in solution can kill bacteria by disrupting bacterial cell membranes. Their modes of action have been extensively studied and various models ranging from Pore formation to Carpet-like mechanism were proposed. Surface immobilized AMPs have been used as coatings to kill bacteria and as sensors to capture bacteria, but the interaction mechanisms of surface immobilized AMPs and bacteria are not fully understood. In this research, an analytical platform, SFG-microscope, which is composed of a sum frequency generation (SFG) vibrational spectrometer and a fluorescence microscope, was used to probe molecular interactions between surface immobilized AMPs and bacteria in situ in real time at the solid/liquid interface...
January 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yuanyuan Han, Jiani Ma, Yu Hu, Jing Jin, Wei Jiang
Monte Carlo simulation combined with experimental method was used to investigate the effect of conformational structure of polymer brushes on their protein resistance. The end-grafted polymers with two conformational structures, i.e., linear and looped, were considered. Protein adsorption behaviors on the surfaces grafted with either linear or looped polymers were investigated. Different chain lengths and grafting numbers of end-grafted polymers were employed in this simulation. The simulation results indicated that for long polymer brushes, the conformational change from linear to looped generally improved their protein resistant property for all the grafting numbers investigated here, and a remarkable improvement of protein resistance can be achieved at a certain grafting number...
January 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ivan U Vakarelski, Rogerio Manica, Er Qiang Li, Elka S Basheva, Derek Y C Chan, Sigurdur T Thoroddsen
Coalescence dynamics between deformable bubbles and droplets can be dramatically affected by the mobility of the interfaces with fully tangentially mobile bubble-liquid or droplet-liquid interfaces expected to accelerate the coalescence by orders of magnitudes. However, there is a lack of systematic experimental investigations that quantify this effect. By using high speed camera imaging we examine the free rise and coalescence of small air-bubbles (100 to 1300 μm in diameter) with a liquid interface. A perfluorocarbon liquid, PP11 is used as a model liquid to investigate coalescence dynamics between fully-mobile and immobile deformable interfaces...
January 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
David S Sholl, Zuihof Han, Shu-Hong Yu
Langmuir has a long tradition of publishing excellent theory and modeling papers. As of the time of writing, for example, two modeling papers from 2013 are among the most cited 10 papers in Langmuir from that year [1,2] and the most cited paper from Langmuir in 2016 is a theory and modeling paper [3]. At the same time, many manuscripts using theory and modeling are submitted to Langmuir but are ultimately rejected. Although Langmuir has a mandate to publish the highest quality work of all kinds relevant to interface science, there are some issues that exist that are specific to considering work based on theory and modeling...
January 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Andrea Tummino, Jutta Toscano, Federica Sebastiani, Boris A Noskov, Imre Varga, Richard A Campbell
In this work we demonstrate the ability to tune the formation of extended structures in films of poly(sodium styrene sulfonate)/dodecyltrimethylammonium bromide at the air/water interface through control over the charge/structure of aggregates as well as the ionic strength of the subphase. Our methodology to prepare loaded polyelectrolyte/surfactant films from self-assembled liquid crystalline aggregates exploits their fast dissociation and Marangoni spreading of material upon contact with an aqueous subphase...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Maria Lopez, Jacqueline Denver, Sue Ellen Evangelista, Alessandra Armetta, Gabriella Di Domizio, Sunghee Lee
Cholesterol is an important component of total lipid in mammalian cellular membranes, hence the knowledge of its association with lipid bilayer membranes will be essential to understanding membrane structure and function. A Droplet Interface Bilayer (DIB) provides a convenient and reliable platform through which permeability coefficient and activation energy for water transport across the membrane can be made. In this study, we investigated the effect of acyl chain structure in amphiphilic monoglycerides on the permeability of water across DIB membranes composed of cholesterol and these monoglycerides, where the acyl chain length, number of double bonds, and the position of double bond are varied systematically along the acyl chains...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Geetanjali Meher, Hirak Chakraborty
Eugenol is known for its antimicrobial effects against microorganisms responsible for infectious diseases in human, food borne pathogens and oral pathogens. In spite of several reports on the antimicrobial function of eugenol by modulating the structural properties of cell membrane there was no direct information on the influence of eugenol in the lipid membrane. In this work, we explored the effect of eugenol on organization and dynamics of large unilamellar vesicles (LUVs) of DMPC using the intrinsic fluorescence of eugenol and an extrinsic hydrophobic probe, DPH, in varying phases...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Tomomi Koshiyama, Motoki Tanaka, Masayuki Honjo, Yumi Fukunaga, Tomoya Okamura, Masaaki Ohba
Coordination polymer (CP) nanoparticles (NPs) formed by a self-assembly of organic ligands and metal ions are one of the attractive materials for molecular capture and deliver/release in aqueous media. Control of particle size and prevention of aggregation among CP NPs are important factors for improving their adsorption capability in water. We demonstrate here the potential of a liposome incorporating an antibiotic ion channel as a vessel for synthesizing Prussian blue (PB) NPs, being a typical CP. In the formation of PB NPs within liposomes, the influx rate of Fe2+ ions into liposome encapsulated [Fe(CN)6]3- through channels was fundamental for the change of NPs' sizes...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Uddalok Sen, Souvick Chatterjee, Ranjan Ganguly, Richard Dodge, Lisha Yu, Constantine M Megaridis
Spontaneous pumpless transport of droplets on wettability-confined tracks is important for various applications, such as rapid transport and mixing of fluid droplets, enhanced dropwise condensation, biomedical devices, etc. Recent studies have shown that on an open surface, a superhydrophilic track of diverging width, laid on a superhydrophobic background, facilitates the transport of water from the narrower end to the wider end at unprecedented rates (up to 40 cm/s), without external actuation. Keeping in mind that such designs play a key role for a diverse range of applications handling organic liquids and in point-of-care devices, the importance of characterizing the spreading behavior of viscous liquids on such surfaces cannot be over-emphasized...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Roobala Chelladurai, Koushik Debnath, Nikhil R Jana, Jaydeep Kumar Basu
Interaction of functional nanoparticles with cells and model biomembranes have been widely studied to evaluate the effectiveness of the particles as potential drug delivery vehicles and bio-imaging labels as well as in understanding nanoparticle cytotoxicity effects. Charged nanoparticles, in particular, with tunable surface charge have been found to be effective in targeting cellular membranes as well as the sub-cellular matrix. However, a microscopic understanding of the underlying physical principles which govern nanoparticle binding, uptake or diffusion on cells is lacking...
January 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Nobuhiro Kawatsuki, Shogo Inada, Ryosuke Fujii, Mizuho Kondo
In situ formation of N-benzylideneaniline (NBA) side groups achieved photoinduced cooperative reorientation of photoinactive copolymers with phenylaldehyde (PA) and benzoic acid (BA) side groups doped with 4-methoxyaniline (AN) molecules. Thermally stimulated molecular reorientation of the side groups was generated due to the axis-selective photoreaction of the NBA moieties. Selective coating with AN on the copolymer film formed NBA moieties in the desired region, resulting in a photoinduced birefringent pattern...
January 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Giuseppe Nasti, Sara Coppola, Federico Olivieri, Veronica Vespini, Vito Pagliarulo, Pietro Ferraro
Electrophoresis (EP) and dielectrophoresis (DEP) are two well established methodologies to manipulate nanoparticles (NPs). Recently, a DEP by virtual electrodes platform was demonstrated on ferroelectric substrates where the driving force is due to the strong electric field generated by pyroelectric effect thus opening new scenarios for manipulating the matter. Such innovative approach named pyroelectric-DEP has several advantages over the traditional EP and DEP. However, a detailed study on this novel approach is required for understanding the complex pathways traced by nanoparticles (NP) under the action of the pyroelectric driven forces and thus for explaining the final patterns...
January 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Shanshan Guo, Dicky Pranantyo, En-Tang Kang, Xian Jun Loh, Xiaoying Zhu, Dominik Jańczewski, Koon-Gee Neoh
Understanding protein adsorption behaviors on solid surfaces constitutes an important step towards development of efficacious and biocompatible medical devices. Both surface charge and wettability have been shown to influence protein adsorption attributes including the kinetics, quantities, deformation and reversibility. However, determining the dominant interaction in these surface-induced phenomena is challenging due to the complexity of inter-related mechanisms at the liquid/solid interface. Herein, we reveal the dominant interfacial forces in these essential protein adsorption attributes under the influence of a combination of surface charge and wettability using a quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM)-based force spectroscopy on a series of model surfaces...
January 10, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jeremy Cure, Hala Assi, Kévin Cocq, Lorena Marín, Katia Fajerwerg, Pierre Fau, Eric Beche, Yves J Chabal, Alain Esteve, Carole Rossi
The integration of high-purity nano-objects on substrates remains a great challenge for addressing scaling-up issues in nanotechnology. For instance, grafting gold nanoparticles (NPs) on zinc oxide films, a major step process for catalysis or photovoltaic applications, still remains difficult to master. We report a modified photo-deposition (P-D) approach that achieves tight control of the NPs size (7.5 ± 3 nm), shape (spherical), purity, and high areal density (3500 ± 10 NPs/m2) on ZnO films. This deposition method is also compatible with large ZnO surface areas...
January 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiaoqiang An, Chengzhi Hu, Huijuan Liu, Jiuhui Qu
Oxygen vacancies have been demonstrated to enhance the interfacial charge separation in TiO2-based photocatalysts. In this report, we explored a facile route to synthesize hierarchical nanotubular anatase/rutile/TiO2(B) nanostructures with high surface area and defective electronic structure. The formation of oxygen vacancies in the heterophase junction was analyzed by UV-Vis absorption spectra, electron spin resonance and X-ray photoelectron spectroscopy. The enhanced interfacial charge separation and transportation ensured the excellent photoactivity of oxygen-deficient junctions for the photocatalytic production of hydrogen...
January 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Sébastien Andrieux, Wiebke Drenckhan, Cosima Stubenrauch
Many properties of solid foams depend on the distribution of the pore sizes and their organization in space. However, these two parameters are very difficult to control with most traditional foaming techniques. Here we show how microfluidics can be used to tune the polydispersity of the foams (mono- vs different polydispersities) and the spatial organization of the pores (ordered vs disordered). For this purpose, the microfluidic flow-focusing technique was modified such that the gas pressure oscillates periodically, which translates into periodically oscillating bubble sizes in the liquid foam template...
January 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Keishi Suga, Yoko Otsuka, Yukihiro Okamoto, Hiroshi Umakoshi
Aqueous dispersions of oleic acid (OA) and those modified with 1-oleoylglycerol (monoolein, MO) form various kinds of self-assembled structures: micelles, vesicles, oil-in-water (O/W) emulsions, hexagonal phases, and dispersed cubic phases. Conventionally, these self-assembled structures have been characterized using cryogenic transmission electron microscopy or X-ray diffraction spectroscopy. However, these methodologies require specialized treatments before they can be used, which may lead to the self-assemblies not adopting their true equilibrium state...
January 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Pavel Yazhgur, Sampsa Vierros, Delphine Hannoy, Maria Sammalkorpi, Anniina Salonen
We have studied adsorbed layers of cetyltrimethylammonium bromide (CTAB) at air-water interfaces in the presence of added electrolyte. Fast bubble compression/expansion measurements were used to obtain the surface equation of state, i.e. the surface tension vs CTAB surface concentration dependence. We show that while a simple model where the surfactant molecules are assumed to be non-interacting is insufficient to describe the measured response of the surfactant layer, a modified Frumkin equation where the local interactions between the molecular components depend on their surface concentration captures the response...
January 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Nasim Ganji, Iftheker Khan, Geoffrey D Bothun
We have investigated the surface activity of poly(ethylene glycol) (PEG)-coated silver nanoparticles (Ag-PEG) in the presence or absence of lipid monolayers comprised of mono-unsaturated dioleoylphosphocholine and dioleoylphosphoglycerol (DOPC/DOPG; 1:1 mole ratio). Dynamic measurements of surface pressure demonstrated that Ag-PEG were surface-active at the air/water interface. Surface excess concentrations suggested that at high Ag-PEG subphase concentrations, Ag-PEG assembled as densely-packed monolayers in the presence and absence of a lipid monolayer...
January 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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