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Langmuir: the ACS Journal of Surfaces and Colloids

Xuebo Quan, Daohui Zhao, Libo Li, Jian Zhou
Surface functionalization of nanoparticles (NPs) with stealth polymers (e.g., hydrophilic and zwitterionic polymers) has become a common strategy to resist non-specific protein adsorption recently. Understanding the role of surface decoration on NP-biomembrane interactions is of great significance to promote the application of NPs in biomedical fields. Herein, using coarse-grained molecular dynamics (CGMD) simulations, we investigate the interactions between stealth polymer-coated gold nanoparticles (AuNPs) and lipid membranes...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Alice Liu, Jacob M Berlin
Synthesis of spherical, biocompatible nanoparticle aggregates using a small molecular crosslinker is a simple and flexible approach for the controlled assembly of gold nanoparticles. This strategy can be extended to a variety of crosslinkers, making it possible to the test the effect of crosslinker properties on aggregate formation and physicochemical properties. Here we synthesized aggregates using a series of structurally homologous crosslinkers with differing valencies. These aggregates have the same size, morphology, surface charge, surface coating, and stability in salt, media, and low pH conditions, but they differ in their stability to cyanide etching and uptake by cells...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Sebastian Backes, Patrick Krause, Weronika Tabaka, Marcus U Witt, Regine von Klitzing
The present study adresses the multi-responsive behavior of Poly(N-isopropylacrylamide) (PNIPAM) microgels adsorbed to interfaces. The microgels react to changes in temperature by shrinking in aqueous solution above their volume phase transition temperature (VPTT). Additionally, they shrink in mixtures of water and ethanol, although both individual liquids are good solvents for PNIPAM. The combination of this so-called cononsolvency effect and the temperature response of adsorbed microgels is studied by atomic force microscopy (AFM)...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Olga Kleinerman, Mohammed Adnan, Daniel M Marincel, Anson Wk Ma, E Amram Bengio, Cheol Park, Sang-Hyon Chu, Matteo Pasquali, Yeshayahu Talmon
Boron nitride nanotubes (BNNTs) are of interest for their unique combination of high tensile strength, high electrical resistivity, high neutron cross-section, and low reactivity. The fastest route to employing these properties in composites and macroscopic articles is through solution processing. However, dispersing BNNTs without functionalization or use of a surfactant is challenging. We show here by cryogenic transmission electron microscopy that BNNTs spontaneously dissolve in chlorosulfonic acid as disentangled individual molecules...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Huilin Ma, Aliza Khan, Shikha Nangia
The self-assembly of outer membrane protein F (OmpF) in the outer membrane of Escherichia coli Gram-negative bacteria was studied using multiscale molecular dynamics simulations. To facilitate the long timescale required for protein assembly, coarse-grained parameterization of E. coli outer membrane lipids was first developed. The OmpF monomers formed stable dimers at specific protein-protein interactions sites irrespective of the lipid membrane environment. The dimer intermediate was asymmetric but provided a template to form a symmetric trimer...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Paula M P Lins, Valeria Spolon Marangoni, Thiers M Uehara, Paulo Barbeitas Miranda, Valtencir Zucolotto, Juliana Cancino Bernardi
Understanding the interactions between biomolecules and nanomaterials is of great importance for many areas of nanomedicine and bioapplications. Although studies in this area have been performed, the interactions between cell membranes and nanoparticles are not fully understood. Here, we investigate the interactions that occur between the Langmuir monolayers of dipalmitoylphosphatidyl glycerol (DPPG) and dipalmitoylphosphatidyl choline (DPPC) with gold nanorods (NR) - with three aspect ratios - and gold nanoparticles...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jason R Miles, Spencer L Schlenker, Yeongun Ko, Rohan R Patil, Balaji M Rao, Jan Genzer
Surface-bound wettability gradients allow for a high-throughput approach to evaluate surface interactions for many biological and chemical processes. Here we describe the fabrication of surface wettability gradients on flat surfaces by a simple, two-step procedure that permits precise tuning of the gradient profile. This process involves the deposition of homogeneous silane SAMs followed by the formation of a surface coverage gradient through the selective removal of silanes from the substrate. Removal of silanes from the surface is achieved by using tetrabutylammonium fluoride which cleaves selectively the Si-O bonds at the headgroup of the silane...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Florian Lapierre, Andrew A Gooley, Michael Breadmore
Capillary action is one mechanism microfluidics uses to draw liquid autonomously in a substrate without the need of external energy. This behaviour can be exploited to collect accurate volumes of liquids such as blood in narrow columns known as capillaries and help the development of inexpensive, user-friendly personalised biomedical tools. Precision bore glass capillaries demonstrate the 'state of the art' for volume accuracy and precision but dimension of height and radius must be carefully chosen in order to exploit the capillary action behaviour efficiently...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Binita Pathak, Sandeep Hatte, Saptarshi Basu
Evaporation dynamics of a particle laden droplet has been a topic of interest in recent times due to its widespread applications, ranging from surface patterning to drug delivery systems. The interplay of evaporation induced internal flow dynamics, contact line dynamics and nanoparticle self-assembly govern the morphologies of the residual structures. Fine tuning of these residual structures is thus possible by controlling the governing parameters. A nanoparticle laden sessile droplet placed on a hydrophobic substrate undergoes buckling phenomenon which results in a dome-like structure with cavity on the surface...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Gözde Ergin, Mária Lbadaoui-Darvas, Satoshi Takahama
Synergistic and non-synergistic surfactant-water mixtures of sodium dodecyl sulfate (SDS), lauryl betaine (C12B) and cocoamidopropyl betaine (CAPB) systems are studied using molecular simulation to understand the role of interactions among headgroups, tailgroups, and water on structural and thermodynamic properties at the air-water interface. SDS is an anionic surfactant while C12B and CAPB are zwitterionic; CAPB differs from C12B by an amide group in the tail. While the lowest surface tensions at high surface concentrations in the SDS-C12B synergistic system could not be reproduced by simulation, estimated partitioning between surface and bulk show trends consistent with synergism...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Fengyu Yang, Yonglan Liu, Yanxian Zhang, Baiping Ren, Jianxiong Xu, Jie Zheng
Rational design of biomaterials with antifouling properties still remains a challenge, but is important for many bench-to-bedside applications for biomedical implants, drug delivery carriers, and marine coatings. Herein we synthesized and characterized poly(N-acryloylglycinamide) (polyNAGA) and then grafted poly(NAGA) onto Au substrate to form polymer brushes with well controlled film stability, wettability and thickness using the surface-initiated atom transfer radical polymerization (SI-ATRP). The NAGA monomer integrates two hydrophilic amides on the side chain to enhance surface hydration, which is thought as a critical contributor to antifouling property...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Abraham Olusegun Oluwole, Johannes Klingler, Bartholomäus Danielczak, Jonathan Oyebamiji Babalola, Carolyn Vargas, Georg Pabst, Sandro Keller
Membrane proteins usually need to be extracted from their native environment and separated from other membrane components for in-depth in vitro characterization. The use of styrene/maleic acid (SMA) copolymers to solubilize membrane proteins and their surrounding lipids into bilayer nanodiscs is an attractive approach toward this goal. We have recently shown that diisobutylene/maleic acid (DIBMA) copolymer similarly solubilizes model and cellular membranes but, unlike SMA(3:1), has a mild impact on lipid acyl-chain order and thermotropic phase behavior...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Seok Hwan Yang, Do Jin Im
The positive and negative charging difference in the contact charge electrophoresis of a water droplet suspended in oil was investigated to find out the origin of this charging difference. Through numerous experiments and numerical analysis, the charging difference has been found to be mainly originated from electrostatic sources. Two electrostatic sources were found in the present experimental setup, and by excluding those two sources the charging difference was successfully diminished. The present findings well explain previous experimental results and also provide design guidelines for consistent droplet movement control in contact charge electrophoresis-based digital microfluidic systems...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Aoli Wu, Fei Lu, Panpan Sun, Xuanxuan Qiao, Xinpei Gao, Li-Qiang Zheng
Supramolecular ionogels were prepared by self-assemble of small molecules through host-guest interaction between β-cyclodextrin (β-CD) and a room-temperature ionic liquid (IL) 3-(1-methyl-3-imidazolio)propanesulfonate - lithium bis(trifluoromethanesulfonyl)imide (MIPS-LiTFSI) which contains zwitterion MIPS. 19F NMR and 2D ROESY 1H NMR have been used to prove that only TFSI- is involved in the complexation. 1H NMR, FT-IR and comparative tests indicated that the electrostatic interaction between imidazole cation and TFSI- anion and intermolecular hydrogen bonding between three compounds also contribute to the formation of supramolecular ionogel...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Amol A Kulkarni, Victor Sebastian
Continuous segmented flow interfacial synthesis of Au nanostructures is demonstrated in a microchannel reactor. This study brings new insights into the growth of nanostructures at continuous interfaces. The size as well as the shape of the nanostructures showed significant dependence on the reactant concentrations, reaction time, temperature and surface tension, which actually controlled the interfacial mass transfer. The microchannel reactor assisted in achieving high interfacial area, as well as uniformity in mass transfer effects...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Yumi Kobayashi, Yuzo Kitazawa, Kei Hashimoto, Takeshi Ueki, Hisashi Kokubo, Masayoshi Watanabe
We report a lower critical solution temperature (LCST) behavior of binary systems consisting of poly(benzyl methacrylate) (PBnMA) and solvate ionic liquids (SILs): equimolar mixtures of triglyme (G3) or tetraglyme (G4) and lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]). We evaluated the critical temperatures (Tcs) using transmittance measurements. The stability of the glyme-Li+ complex ([Li(G3 or G4)]+) in the presence of PBnMA was confirmed using Raman spectroscopy, pulsed-field gradient spin-echo NMR (PGSE-NMR), and thermogravimetric analysis to demonstrate that the complex was not disrupted...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Oyais Ahmad Chat, Nighat Nazir, Parvaiz Ahmad Bhat, Puthusserickal Abdulrahiman Hassan, Vinod Kumar Aswal, Aijaz Ahmad Dar
The effect of lavender oil on aggregation characteristics of P123 in aqueous-ethanolic solutions is investigated systematically by DLS, SANS and Rheology. The solubilization capacity of the formulation increased by increasing P123 concentration. The study unveiled the importance of the short chain alcohol-ethanol, as solubilization enhancer. The apparent hydrodynamic radius (Rh) increased significantly with increase in lavender oil concentration up to maximum oil solubilization capacity of the copolymer at a particular ethanol concentration...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Claire Kunkle Wemp, Van P Carey
Growing thin, nanostructured layers on metallic surfaces, such as heat exchangers, is an attractive approach to creating thin, superhydrophilic coatings on surfaces to enhance spray cooling heat transfer. This paper presents results of an experimental study of enhanced droplet spreading on zinc oxide, nanostructured surfaces of this type that were thermally grown on a copper substrates. The spreading rate data obtained from experimental high speed videos was used to develop a model specifically for this type of ultra-thin, nano-porous layer...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Christopher Chalmers, Roger Smith, Andrew J Archer
We develop a lattice gas model for the drying of droplets of a nanoparticle suspension on a planar surface, using dynamical density functional theory (DDFT) to describe the time evolution of the solvent and nanoparticle density profiles. The DDFT assumes a diffusive dynamics but does not include the advective hydrodynamics of the solvent, so the model is relevant to highly viscous or near to equilibrium systems. Nonetheless, we see an equivalent of the coffee-ring stain effect, but in the present model it occurs for thermodynamic rather the fluid-mechanical reasons...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Riho Matsumoto, Yoshitaka Nakagawa, Kazumi Kato, Yuya Oaki, Hiroaki Imai
Elaborate two-dimensional (2D) microarrays of tetragonal Mn3O4 nanocuboids 10-20 nm in size were constructed with parallel trenches 500 nm wide and 500 nm deep on a silicon substrate. By adjusting the conditions, including the dispersion medium, particle concentration, and evaporation rate, the a-face and c-face 2D arrays were selectively deposited on the upper and lower stages of the trenches, respectively. The crystallographic direction of the tetragonal crystal was alternately switched in the 2D microarrays under these specific conditions at the optimal particle concentration and evaporation rate...
November 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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