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1,249 Newest Publications about the topic solution

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Dielectric Relaxation of Spherical Polyelectrolyte Brushes: Movement of Counterions and Electrical Properties of the Brush Layer

28-Jul-2015 | Haiyan Wu; Kongshuang Zhao, Langmuir, 2015

Dielectric behaviors of spherical polyelectrolyte brush (SPB) suspensions under various mass fractions of SPB and the pH of solution were investigated in a frequency range of 40 Hz to 110 MHz. The SPB consists of a polystyrene (PS) core grafted with poly(acrylic acid) (PAA) chains. Two unique ...

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Dynamic Mass Transfer of Hemoglobin at the Aqueous/Ionic-Liquid Interface Monitored with Liquid Core Optical Waveguide

24-Jul-2015 | Xuwei Chen; Xu Yang; Wanying Zeng; Jianhua Wang, Langmuir, 2015

Protein transfer from aqueous medium into ionic liquid is an important approach for the isolation of proteins of interest from complex biological samples. We hereby report a solid-cladding/liquid-core/liquid-cladding sandwich optical waveguide system for the purpose of monitoring the dynamic ...

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Capillary Force between Flexible Filaments

23-Jul-2015 | Majid Soleimani; Reghan J. Hill; Theo G. M. van de Ven, Langmuir, 2015

Liquid droplets bridging filaments are ubiquitous in nature and technology. Although the liquid-surface shape and the capillary force and torque have been studied extensively, the effect of filament flexibility is poorly understood. Here, we show that elastic deformation (at large values of the ...

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Surface Activity and Aggregation Behavior of Siloxane-Based Ionic Liquids in Aqueous Solution

23-Jul-2015 | Guoyong Wang; Ping Li; Zhiping Du; Wanxu Wang; Guojin Li, Langmuir, 2015

Six novel siloxane-based surface-active ionic liquids (SAILs)—siloxane ammonium carboxylate [Si(n)N(2)-CA(1), (n = 3, 4)]—were designed and synthesized. Their melting points, surface activities, and self-aggregation behavior in aqueous solution were studied. The results showed that because of the ...

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UV/Vis Spectroscopy Studies of the Photoisomerization Kinetics in Self-Assembled Azobenzene-Containing Adlayers

22-Jul-2015 | N. R. Krekiehn; M. Müller; U. Jung; S. Ulrich; R. Herges; O. M. Magnussen, Langmuir, 2015

Direct comparative studies of the photoisomerization of azobenzene derivatives in self-assembled adlayers on Au and as free molecules in dichloromethane solution were performed using UV/vis spectroscopy. For all studied systems a highly reversible trans–cis isomerization in the adlayer is ...

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A New Insight into Growth Mechanism and Kinetics of Mesoporous Silica Nanoparticles by in Situ Small Angle X-ray Scattering

22-Jul-2015 | Zhifeng Yi; Ludovic F. Dumée; Christopher J. Garvey; Chunfang Feng; Fenghua She; James E. Rookes; Stephen Mudie; Dav ..., Langmuir, 2015

The growth mechanism and kinetics of mesoporous silica nanoparticles (MSNs) were investigated for the first time by using a synchrotron time-resolved small-angle X-ray scattering (SAXS) analysis. The synchrotron SAXS offers unsurpassed time resolution and the ability to detect structural changes ...

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Fabrication of Three-Layer-Component Organoclay Hybrid Films with Reverse Deposition Orders by a Modified Langmuir–Schaefer Technique and Their Pyroelectric Currents Measured by a Noncontact Method

21-Jul-2015 | Masanari Hirahara; Yasushi Umemura, Langmuir, 2015

In an aqueous clay mineral (montmorillonite) dispersion at a low concentration, isolated clay nanosheets with negative charges were suspended. When a solution of amphiphilic octadecylammonium chloride (ODAH+Cl–) was spread on an air-dispersion interface, the clay nanosheets were adsorbed on the ...

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Electrocatalytic Nitrate Reduction by a Cobalt Protoporphyrin Immobilized on a Pyrolytic Graphite Electrode

21-Jul-2015 | Jing Shen; Yuvraj Y. Birdja; Marc T. M. Koper, Langmuir, 2015

A series of simple molecular catalysts, i.e., Co(III), Fe(II), Ni(II), Cu(II), and Rh(II) protoporphyrins (metal-PP), directly adsorbed on pyrolytic graphite have been utilized for catalyzing the electrochemical reduction of nitrate. These catalysts are studied by combining cyclic voltammetry ...

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Nature of CTAB/Water/Chloroform Reverse Micelles at Above- and Subzero Temperatures Studied by NMR and Molecular Dynamics Simulations

21-Jul-2015 | Lubica Klíčová; Eva Muchová; Peter Šebej; Petr Slavíček; Petr Klán, Langmuir, 2015

The nature and stability of cetyltrimethylammonium bromide (CTAB) reverse micelles in chloroform formed above the critical micellar concentration at above- and subzero temperatures were examined by NMR and molecular dynamics simulations. The experiments showed that the supercooled micellar water ...

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Interaction of Hyaluronan with Cationic Nanoparticles

20-Jul-2015 | Fouzia Bano; Mónica Carril; Paolo Di Gianvincenzo; Ralf P. Richter, Langmuir, 2015

The polysaccharide hyaluronan (HA) is a main component of peri- and extracellular matrix, and an attractive molecule for materials design in tissue engineering and nanomedicine. Here, we study the morphology of complexes that form upon interaction of nanometer-sized amine-coated gold particles ...

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