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Langmuir: the ACS Journal of Surfaces and Colloids

Diyuan Zong, Zhen Yang, Yuanyuan Duan
The wetting kinetics of droplets on lyophilic pillar-arrayed substrates is the driving mechanism of several natural phenomena (e.g., insect capturing by Nepenthes) and many industrial technologies (e.g., gas-liquid separation). For a lyophilic pillar-arrayed surface, a fringe film is formed ahead of the contact line, resulting in distinct wetting kinetics, which needs further investigation. In this study, Si(100) substrates with square micropillars were used to investigate the early spreading of droplets on lyophilic pillar-arrayed surfaces through the droplet-spreading method...
March 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhili Wan, Yingen Sun, Lulu Ma, Feibai Zhou, Jian Guo, Song-Qing Hu, Xiao-Quan Yang
Nanofibrils from self-assembly of the naturally occurring saponin glycyrrhizic acid (GA) can be used to create an oil-in-water emulsion foam with long-term stability. Through a homogenization and aeration followed by a rapid cooling, stable emulsion foams can be produced from the mixtures of sunflower oil and saponin nanofibrils. At high temperature, the GA fibrils form a multilayer assembly at the interface, creating an interfacial fibrillar network to stabilize the oil droplets and air bubbles generated during homogenization...
March 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Marlena Whinton, Timothy C Hughes, Shuhua Peng, Michael A Brook
Bicontinuous microemulsions exhibit domain structures on the nanoscale (<20 nm). Normally, such fine details are lost during the conversion from a fluid microemulsion to solid elastomeric materials, as a consequence of interfacial destabilization via polymerization of either the oil phase, or of monomers in the aqueous phase. Very little is known about the polymerization of silicone microemulsions and the morphological changes that occur upon transition from a nanostructured liquid to a solid ma-trix. Silicone microemulsions polymerized by free radical (aqueous phase) and condensation (silicone phase) processes, respective-ly, were characterized by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM)...
March 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jianfeng Zhang, Qunling Fang, Jinyu Duan, Hongmei Xu, Hua-Jian Xu, Shouhu Xuan
This work reports a novel Fe3O4@polydopamine-Au-polydopamine core/shell nanocomposite towards magnetically separable nanocatalyst. Because the polydopamine (PDA) layers sandwiched Au nanocrystals were prepared by a layer-by-layer method, the content of Au could be controlled by varying the Au shell number (such as burger-like Fe3O4@PDA/Au/PDA/Au/PDA). The Fe3O4@PDA/Au/PDA exhibited excellent catalytic activity on reducing the p-Nitrophenol since the substrate could penetrate the PDA shell. Owing to the protection of PDA shell, the Fe3O4@PDA/Au/PDA presented higher cyclability than the Fe3O4@PDA/Au...
March 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Takashi Hoshiba, Chiaki Yoshikawa, Keita Sakakibara
Charged substrates are expected to promote cell adhesion via electrostatic interaction, but it remains unclear how cells adhere to these substrates. Here, initial cell adhesion (< 30 min) was re-examined on charged substrates in serum-containing and serum-free media to distinguish various cell adhesion mechanisms (i.e., electrostatic interaction, hydrophobic interaction, and biological interaction). Cationic and anionic methacrylate copolymers were coated on nonionic non-tissue culture treated polystyrene to create charged substrates...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Niloy Kundu, Debasis Banik, Nilmoni Sarkar
Amphiphiles are class of molecules which are known to assemble into a variety of nanostructures. The understanding and applications of self-assembled systems are based on what has been learned from biology. Among the vast number of self-assemblies, in this article, we have described the formation, characterization and dynamics of two important biologically inspired assemblies, vesicles and fibrils. Vesicles, which can be classified into several categories depending on the sizes and components, are of great interest due to their potential application in drug delivery and as nanoscale reactor...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Mandy Hei Man Leung, Amy Q Shen
The ability to control particle size and size distribution of nanoparticles for drug delivery is essential because it impacts on the biodistribution and cellular uptake of nanoparticles. We present a novel microfluidic assisted nanoprecipitation strategy that enables synthesis of surfactant-free curcumin encapsulated poly(lactide-co-glycolide) nanoparticles (Cur-PLGA NP) with adjustable particle diameters (30-70nm) and narrow particle size distribution (polydispersity index less than 0.2). Our Cur-PLGA NP exhibit excellent colloidal stability and inhibit degradation of curcumin...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yongbing Song, Teng Xie, Run Jiang, Zheng Wang, Yuhua Yin, Baohui Li, An-Chang Shi
The self-assembly behaviors of two block copolymers with the same chain length but different chain architectures (cyclic AB, linear ABA) in B-selective solvents are investigated using Monte Carlo simulations. A morphological transition sequence, from spherical micelles to cylindrical micelles, to vesicles and then to multicompartment vesicles, is observed for both copolymer systems when the interaction between the solvophobic A-block and the solvent is increased. In particular, toroidal micelles could be formed in triblock systems due to the presence of the bridging chains at the parameter region between cylindrical micelles and vesicles whereas disk-like micelles are formed in cyclic systems...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Fenhong Song, Dapeng Ju, Fangwei Gu, Yan Liu, Yuan Ji, Yulin Ren, Xiaocong He, Baoyong Sha, Ben Q Li, Qingzhen Yang
Electric field induced micro/nano patterns in thin polymer film, sometimes referred as electrohydrodynamic patterning, is a promising technique to fabricate micro/nano structures. Extensive attentions have been attracted due to its advantages in micro contact (easy demolding) and low cost. Although considerable work has been done on this technique, including both experimental and theoretical ones, there still appears a requirement for understanding the mechanism of electrohydrodynamic patterning. Thus we systematically studied the effect of different parameters on electrohydrodynamic patterning with a numerical phase field model...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Benno M Blaschke, Philip Böhm, Simon Drieschner, Bert Nickel, Jose Antonio Garrido
Anionic and cationic lipids are key molecules involved in many cellular processes; their distribution in biomembranes is highly asymmetric and their concentration is well controlled. Solution-gated graphene field-effect transistors (SGFETs) exhibit high sensitivity towards the presence of surface charges. Here, we establish conditions that allow the observation of the formation of charged lipid layers on solution-gated field-effect transistors in real time. We quantify the electrostatic screening of electrolyte ions and derive a model that explains the influence of charged lipids on the ion sensitivity of graphene SGFETs...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Michael E Paulaitis, Kitty Agarwal, Serge Patrick Nana-Sinkam
A model is proposed for characterizing exosome size distributions based on dynamic scaling of domain growth on the limiting membrane of multivesicular bodies in the established exosome biogenesis pathway. The scaling exponent in this model captures the asymmetry of exosome size distributions, which are notably right-skewed to larger vesicles independent of the minimum detectable vesicle size. Analyses of exosome size distributions obtained by cryo-TEM imaging and nanoparticle tracking (NTA) show, respectively, that the scaling exponent is sensitive to the state of the cell source for exosomes in cell culture supernatants, and can distinguish exosome size distributions in serum samples taken from cancer patients relative to those from healthy donors...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Daniel Alejandro Peñalva, Silvia Antollini, Ernesto Ambroggio, Marta I Aveldaño, Maria Laura Fanani
In rat sperm head, sphingomyelin (SM) species that contain very long chain PUFA (V-SM) become ceramides (V-Cer) after inducing in vitro the acrosomal reaction. The reason for such a specific location of this conversion, catalysed by a sphingomyelinase (SMase), has received little investigation so far. Here, the effects of SMase were compared in unilamellar vesicles (LUVs, GUVs) containing phosphatidylcholine and either V-SM or a palmitate-rich SM (P-SM). In uniformly sized LUVs at 37 °C, more V-Cer was generated, and more rapidly, than P-Cer...
March 15, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Daejong Yang, Jaehwan Lee, Donghwan Kim, Incheol Cho, Jong G Ok, Inkyu Park
We propose ZnO nanowire and TiO2 nanotube based light sensors on flexible polymer substrates fabricated by localized hydrothermal synthesis and liquid phase deposition (LPD). This method realized simple and cost-effective in-situ synthesis and integration of ZnO and TiO2 one dimensional nanomaterials. The fabricated sensor devices with ZnO nanowires and TiO2 nanotubes show very high sensitivity and quick response to the ultraviolet (UV) and ambient light, respectively. In addition, our direct synthesis and integration method made mechanical robustness under external loading such as static and cyclic bending because of both the strong bonding between nanomaterial and electrode...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jiakai Lu, Diego Martín Martín Campana, Carlos M Corvalan
The contraction of surfactant-laden pores at the microscale has implications for natural and technological processes ranging from the collapse of channels in lipid membranes to the stability of foams in the food processing industry. Despite its prevalence, our understanding of the mechanisms of pore contraction in the presence of surfactants remains unclear. These mechanisms are challenging to study experimentally given the small length scale near the singularity and simulations capable of accurately characterizing the pore dynamics may help enhance our understanding of the process...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
James Patrick Ewen, Sridhar Kumar Kannam, Billy D Todd, Daniele Dini
The slip and friction behaviour of n-hexadecane, confined between organic friction modifier (OFM) surfactant films adsorbed on hematite surfaces, have been studied using nonequilibrium molecular dynamics (NEMD) simulations. The influence of OFM type and coverage, as well as the applied shear rate and pressure have been investigated. A measurable slip length is only observed for OFM films with a high surface coverage, which provide smooth interfaces between well-defined OFM and hexadecane layers. Slip commences above a critical shear rate, beyond which the slip length first increases with increasing shear rate and then asymptotes towards a constant value...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Shabeeb Hussain, Mohammad Mahdi Tavakoli, Aashir Waleed, Umar Siddique Virk, Shihe Yang, Amir Waseem, Zhiyong Fan, Muhammad Arif Nadeem
We demonstrate for the first time the application of p-NiFe2 O4 /n-Fe2 O3 composite thin films as anode materials for light-assisted electrolysis of water. The p-NiFe2 O4 /n-Fe2 O3 composite thin films were deposited on planar fluorinated tin oxide (FTO)-coated glass as well as on 3D array of nanospike (NSP) substrates. The effect of substrate (planar FTO and 3D-NSP) and percentage change of each component (i.e., NiFe2 O4 and Fe2 O3 ) of composite was studied on photoelectrochemical (PEC) water oxidation reaction...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiaolu Jia, Tian Zhang, Jianying Wang, Haiying Tan, Yuandu Hu, Lianbin Zhang, Jintao Zhu
In this work, we present a fast and efficient strategy for the preparation of responsive photonic hydrogels for aldehyde sensing by combining the self-assembly of monodisperse carbon-encapsulated Fe3O4 nanoparticles (NPs) and in-situ photopolymerization of polyacrylamide (PAM) hydrogels. The responsive photonic hydrogels exhibit structural color variation after being treated with formaldehyde aqueous solution, which can be attributed to the chemical reaction between the amide groups in the hydrogels and the formaldehyde...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Fangfang Liu, Bin Shan, Shufen Zhang, Bingtao Tang
Structural colors are attracting considerable attention for their advantages of environmental friendliness and resistance to fading. However, the weak mechanical strength and intrinsic iridescent color restrict their widespread application. This article describes a SnO2 inverse opal composite film with low angle-dependent structural color and enhanced mechanical strength. In the present study, a direct template method was used to prepare SnO2 inverse opals, which were then embedded in polydimethylsiloxane (PDMS)...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Laure Fillaud, Thomas Petenzi, Justine Pallu, Benoit Piro, Giorgio Mattana, Vincent Noel
Stimuli-responsive hydrogels represent a class of materials capable of reversibly switching their morphological and physicochemical characteristics. An ultrathin poly(acrylic acid) film (ca. 6 nm) grafted onto the gate of a p-type EGOFET is studied and the correlation between the swelling state of the hydrogel and the transistor output characteristics is presented. The hydrogel-related swelling process occurring in basic medium causes an increase in threshold voltage due to the abrupt and intense increase of the negative charge density on the gate electrode...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Nhat Tri Vo, Astam Kumar Patra, Dukjoon Kim
The new class of silica nanoparticles with unprecedented structural morphology is synthesized by hydrolysis of tetraethyl orthosilicate (TEOS) in the presence of cetyltrimethylammonium bromide (CTAB), L-arginine, and ammonium metatungstate (AMT) composite template, all in aqueous ethanol. The morphology of the synthesized mesoporous silica nanoparticles (MSNs) can be tuned from a spherical to a hollow dough-nut shape through a hollow sphere by controlling the concentration of AMT in the composite template. The formation mechanism of the hol-low doughnut shaped MSNs (hd-MSNs) is well explored by means of zeta potential, high resolution transmission electron microscopy (HRTEM) with elemental mapping analysis, and X-ray photoelectron spectroscopy...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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