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Langmuir: the ACS Journal of Surfaces and Colloids

Mehdi Meran, Pelin Deniz Akkus, Ozge Kurkcuoglu, Elif Baysak, Gurkan Hizal, Ebru Haciosmanoglu, Ayhan Unlu, Nilgun Karatepe, Fatma Seniha Guner
Single-walled carbon nanotubes (SWNTs) became increasingly exploited in biological applications, such as imaging and drug delivery. The application of SWNTs in biological settings requires surface chemistry to come through with the low solubility in aqueous media. In this research, a facile approach for the preparation of PEG-coated SWNT-based nanocarrier was reported. We focused on the effect of polyethylene glycol (PEG) chain length and SWNTs size on the cytotoxicity of PEG-coated SWNTs as a superior drug delivery nanovector...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Peiliu Li, Bo Zhang, Hongbin Zhao, Lunjia Zhang, Zhe Wang, Xiangyu Xu, Tingting Fu, Xiaonan Wang, Yongping Hou, Yuzun Fan, Lei Wang
Water droplet uni-directional transport on asymmetric superhydrophobic surface has attracted much interest in theory analysis and applications, such as self-cleaning, anti-fogging, anti-icing, heat transfer and so on. Different from the symmetrical performance on the uniform topographies, the droplets acting on asymmetric surface perform anisotropic state and easily roll off the surface along special direction. This phenomenon is indicated by natural butterfly wings. The flexible asymmetrically arranged micro-step induces the droplet to release along the outside radial (RO) direction and to pin against the RO direction...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
JinJian Wei, Hideyuki Mitomo, Takeharu Tani, Yasutaka Matsuo, Kenichi Niikura, Masayuki Naya, Kuniharu Ijiro
The self-assembly of gold nanoparticles (GNPs) into a defined structure, particularly hollow capsule structures, provides great potential for applications in materials science and medicine. However, the complexity of the parameters for the preparation of those structures through self-assembly have limited access to critical mechanistic questions. With this in mind, we have studied gold nanoparticle vesicle (GNV) formation through self-assembly by the surface modification of GNPs with low molecular weight ligands...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Huxiang Guo, Yunjie Zhang, Renliang Huang, Rongxin Su, Wei Qi, Zhimin He
Fly ash particles can contribute to haze and adverse health outcomes. In this study, two mucins, one from bovine submaxillary gland (BSM), and one from porcine stomach (PGM), as well as bovine serum albumin (BSA), served as the physical barrier against foreign substances entering tissues and the blood protein, respectively, were chosen as models for investigations of the interactions between proteins and fly ash particles. Their adsorption behaviors were studied using spectroscopy and a quartz crystal microbalance with a dissipation monitor (QCM-D)...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiao Gong, Bingchen Wang, Andrew Kozbial, Lei Li
To optimize the wetting performance of ionic liquids (ILs) on solid surfaces, which is important in catalysis, lubrication and energy storage, it is critical to control the molecular arrangement of ILs at the IL/solid interface. Here we report our experimental results showing that tuning humidity is a facile and effective approach manipulating the molecular arrangement and thus controlling the macroscopic wettability of ILs on the mica surface. Fourier transform infrared spectroscopy (ATR-FTIR), contact angle testing and atomic force microscopy (AFM) results showed that, with the increase of the humidity, more water adsorbs on the mica surface, which dissolves and mobilizes K+ on the mica...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ryotaro Koike, Yasutaka Iwashita, Yasuyuki Kimura
In Pickering-Ramsden emulsions, the packing structure of the colloidal particles at the liquid-liquid (or liquid-gas) interface significantly affects the structure and behavior of the emulsion. Here, using a series of plate-like particles with regular polygonal shapes and Janus amphiphilicity, we created emulsion droplets stabilized by close-packed polygonal particles at the interface. The systematic variation of the particle morphology shows that the geometrical features of the regular polygons in (curved) planar packing dominate over the self-assembled structures...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Kousuke Moriyama, Satoru Kidoaki
Directional cell movement from a softer to a stiffer region on a culture substrate with a stiffness gradient, so-called durotaxis, has attracted considerable interest in the field of mechanobiology. Although the strength of a stiffness gradient has been known to influence durotaxis, the precise manipulation of durotactic cells has not been established due to the limited knowledge available on how the threshold stiffness gradient (TG) for durotaxis is determined. In the present study, to clarify the principles for the manipulation of durotaxis, we focused on the absolute stiffness of the soft region and evaluated its effect on the determination of TG required to induce durotaxis...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Subramaniam Ramakrishnan, Saheli Chakraborty
Itaconic acid was readily transformed to a series of amphiphilic diesters via stepwise esterification of itaconic anhydride; the diesters carry one alkyl (cetyl or octyl) group and either a PEG, glyceryl or dopamine segment. These diesters were used as surfmer for the preparation of polystyrene (PS) emulsions, with the expectation that the surface of the emulsion particles would carry PEG, glyceryl or dopamine units. NMR spectroscopic studies revealed that the surfmers were covalently incorporated into the polystyrene chains; furthermore, NMR tube polymerization experiments also confirmed that, when the PEG surfmer was used, the PEG segments are indeed present on the surface of the emulsion particles...
September 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Parham Jafari, Ali Masoudi, Peyman Irajizad, Masoumeh Nazari, Varun Kashyap, Bahareh Eslami, Hadi Ghasemi
Evaporation is a fundamental and core phenomenon in a broad range of disciplines including power generation and refrigeration systems, desalination, electronic/photonic cooling, aviation systems, and even biosciences. Despite its importance, the current theories on evaporation suffer from fitting coefficients with reported values varying in a few orders of magnitude. Lack of a sound model impedes simulation and prediction of characteristics of many systems in these disciplines. Here, we studied evaporation at a planar liquid-vapor interface through a custom-designed, controlled, and automated experimental setup...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ruqaiya Al Nuumani, Guido Bolognesi, Goran T Vladisavljević
Application of TiO2 as a photocatalyst and UV protector is restricted by the difficulties in the recovery of TiO2 nanoparticles after water treatment. In this work, TiO2 nanoparticles (Degussa P25) were immobilised within easily recoverable poly(1,6-hexanediol diacrylate) poly(HDDA)-based polymer microspheres produced by on-the-fly photopolymerization of microfluidically generated droplets. Because of fast polymerization reaction, TiO2 was uniformly distributed within the polymer network. The transformation of double bonds in terminal vinyl groups of HDDA monomer into single bonds during photopolymerization was confirmed by Fourier transform infrared spectroscopy...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Hela Khemissi, Helen Bassani, Adel Aschi, Isabelle Capron, Lazhar Benyahia, Taco Nicolai
Protein particles were complexed with polysaccharides, and the effect on their capacity to stabilize water-in-water (W/W) emulsions was investigated. Protein microgels were formed by heating aqueous solutions of whey protein isolate. The microgels were subsequently mixed with anionic or cationic polysaccharides: κ-carrageenan (κ-car) or chitosan, respectively. The molar mass and radius of the complexes formed in dilute microgel suspensions (40 mg/L) were characterized by light scattering techniques as a function of the pH and the composition...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Leila Zarei, Roya Tavallaie, Moinul H Choudhury, Stephen G Parker, Padmavathy Bakthavathsalam, Simone Ciampi, Vinicius R Gonçales, J Justin Gooding
Light can be used to spatially resolve electrochemical measurements on a semiconductor electrode. This phenomenon has been explored to detect DNA hybridization with light-addressable potentiometric sensors and, more recently, with light-addressable amperometric sensors based on organic-monolayer-protected Si(100). Here, a contribution to the field is presented by comparing sensing performances when bovine serum albumin (BSA) and hexaethylene glycol (OEG6 ) are employed as antifouling layers that resist nonspecific adsorption to the DNA-modified interface on Si(100) devices...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Takeshi Iwasaki, Yuki Tamai, Mikiya Yamamoto, Tatsuo Taniguchi, Keiki Kishikawa, Michinari Kohri
Polydopamine (PDA) is of interest as a mimetic material of melanin to produce structural color materials. Herein, to investigate the influence of the material composition of the artificial melanin particles on structural color, we demonstrated the preparation of core-shell particles by polymerization of norepinephrine or 3,4-dihydroxyphenylalanine, which are melanin precursors similar to dopamine, in the presence of polystyrene particles. It was revealed that the arrays of the prepared particles produce high-visibility structural color because of absorption of scattering light...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Linnea Nilebäck, Suvi Arola, Mathias Kvick, Arja Paananen, Markus B Linder, My Hedhammar
The mechanism of silk assembly, and thus the cues for the extraordinary properties of silk, can be explored by studying the simplest protein parts needed for the formation of silk-like materials. The recombinant spider silk protein 4RepCT, consisting of four repeats of polyalanine and glycine-rich segments (4Rep) and a globular C-terminal domain (CT), has previously been shown to assemble into silk-like fibers at the liquid-air interface. Herein, we study the interfacial behavior of the two parts of 4RepCT, revealing new details on how each protein part is crucial for the silk assembly...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Bo Liu, Rogerio Manica, Xurui Zhang, Adrien Bussonnière, Zhenghe Xu, Guangyuan Xie, Qingxia Liu
The coalescence between microbubbles and millimeter-sized bubbles is an elementary process in various industrial applications such as froth flotation and wastewater treatment. Fundamental understanding of the coalescence behavior between two colliding bubbles requires knowledge of water drainage from the thin liquid film between the deformable air-water surfaces, a simple phenomenon with high complexity in physics because of the interplay of surface forces, hydrodynamic drainage, and surface rheology. In this work, we performed simultaneous measurements of the interaction force and spatial thin-film thickness during the collision between a millimeter-sized bubble (radius 1...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Heiko Ihmels, Siyu Jiang, Mohamed M A Mahmoud, Holger Schönherr, Daniel Wesner, Imad Zamrik
Quadruplex DNA, which is a relevant target for anticancer therapies, may alter its conformation because of interactions with interfaces. In pursuit of a versatile methodology to probe adsorption-induced conformational changes, the interaction between a fluorescent [2.2.2]heptamethinecyanine dye and quadruplex DNA (G4-DNA) was studied in solution and on surfaces. In solution, the cyanine dye exhibits a strong light-up effect upon the association with G4-DNA without interference from double-stranded DNA. In addition, a terminal π-stacking as a binding mode between the cyanine dye and G4-DNA is concluded using NMR spectroscopy...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yaning Zhong, Gufeng Wang
Three-dimensional (3D) single-particle tracking was employed to study the lipid membrane morphology change at different pHs on glass supported lipid bilayers (SLBs) [1,2-dioleoyl- sn-glycero-3-phosphoethanolamine/1,2-dioleoyl- sn-glycero-3-phospho-l-serine (sodium salt)/1,2-dioleoyl- sn-glycero-3-phosphocholine = 5:3:2]. Fluorescently tagged, carboxylated polystyrene nanoparticles (of 100 nm) were used as the probes. At neutral pHs, the particles' diffusion was close to two-dimensional Brownian motion, indicating a mainly planar structure of the SLBs...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Rohit Pillai, Matthew K Borg, Jason M Reese
We report the results of molecular dynamics investigations into the behavior of nanoscale water droplets on surfaces subjected to cyclic-frequency normal vibration. Our results show, for the first time, a range of vibration-induced phenomena, including the existence of the following different regimes: evaporation, droplet oscillation, and droplet lift-off. We also describe the effect of different surface wettabilities on evaporation. The outcomes of this work can be utilized in the design of future nanoengineered technologies that employ surface/bulk acoustic waves, such as water-based cooling systems for high-heat-generating processor chips, by tuning the vibration frequency and amplitude, as well as the surface wettability, to obtain the desired performance...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Glenn McConnell, Samuel Mabbott, Alexander L Kanibolotsky, Peter Skabara, Duncan Graham, Glenn A Burley, Nicolas Laurand
Organic semiconductor lasers are a sensitive biosensing platform that responds to specific biomolecule binding events. So far, such biosensors have utilized protein-based interactions for surface functionalization but a nucleic acid-based strategy would considerably widen their utility as a general biodiagnostic platform. This manuscript reports two important advances for DNA-based sensing using an organic semiconductor (OS) distributed feedback (DFB) laser. Firstly, the immobilization of alkyne-tagged 12/18-mer oligodeoxyribonucleotide (ODN) probes by Cu-catalyzed azide alkyne cycloaddition (CuAAC) or 'click chemistry' onto a 100-nm thick OS laser film modified with an azide-presenting polyelectrolyte monolayer is shown...
September 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Suresh Dhiman, K S Jayaprakash, Rameez Iqbal, Ashis K Sen
We report experimental study of self-transport of aqueous droplets along an oil-submerged diverging groove structure. The migration phenomenon is illustrated and the effect of various parameters such as droplet size d, oil layer thickness h, groove angle θ and groove thickness δ on the droplet transport behaviour (i.e. migration velocity and length) is investigated. Our study reveals that complete engulfment of aqueous droplets in the oil layer, that is attributed to a positive spreading parameter (S>0), is a prerequisite for the droplet transport...
September 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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