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1,176 Newest Publications about the topic solution

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Reversible Swelling–Shrinking Behavior of Hydrogen-Bonded Free-Standing Thin Film Stabilized by Catechol Reaction

01-May-2015 | Jiaxing Sun; Chao Su; Xuejian Zhang; Wenjing Yin; Jian Xu; Shuguang Yang, Langmuir, 2015

Dopamine-modified poly(acrylic acid) (PAA-dopa) and poly(vinylpyrrolidone) (PVPON) was layer-by-layer (LbL) assembled to prepare thin film based on hydrogen bonding. The carboxylic group of acrylic acid and the phenolic hydroxyl group of dopamine can both act as hydrogen bond donors. The critical ...

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Minimizing Unintentional Strain and Doping of Single-Layer Graphene on SiO2 in Aqueous Environments by Acid Treatments

22-Apr-2015 | Katsuya Masuda; Masahito Sano, Langmuir, 2015

The effects of treating SiO2/Si with either acidic or alkaline solutions on single-layer graphene were investigated using Raman microscopy. It is well-known that in air graphene on SiO2 is unintentionally strained and hole-doped to different degrees, varying widely by sample. It is also known ...

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Self-Assembled Monolayers Get Their Final Finish via a Quasi-Langmuir–Blodgett Transfer

14-Apr-2015 | Christian Meltzer; Hanno Dietrich; Dirk Zahn; Wolfgang Peukert; Björn Braunschweig, Langmuir, 2015

The growth of self-assembled monolayers (SAMs) of octadecylphosphonic acid (ODPA) molecules on α-Al2O3(0001) and subsequent dewetting of the SAMs were studied with a combination of in situ sum-frequency generation (SFG) and molecular dynamics (MD) simulations. Although SAM growth after deposition ...

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Surface-Induced Changes in the Conformation and Glucan Production of Glucosyltransferase Adsorbed on Saliva-Coated Hydroxyapatite

13-Apr-2015 | Kenan P. Fears; Mireya Gonzalez-Begne; Corey T. Love; Delbert E. Day; Hyun Koo, Langmuir, 2015

Glucosyltransferases (Gtfs) from S. mutans play critical roles in the development of virulent oral biofilms associated with dental caries disease. Gtfs adsorbed to the tooth surface produce glucans that promote local microbial colonization and provide an insoluble exopolysaccharides (EPS) matrix ...

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Direct Measurements of Colloidal Solvophoresis under Imposed Solvent and Solute Gradients

08-Apr-2015 | Joel S. Paustian; Craig D. Angulo; Rodrigo Nery-Azevedo; Nan Shi; Amr I. Abdel-Fattah; Todd M. Squires, Langmuir, 2015

We describe a microfluidic system that enables direct visualization and measurement of diffusiophoretic migration of colloids in response to imposed solution gradients. Such measurements have proven difficult or impossible in macroscopic systems due to difficulties in establishing solution ...

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Molecular Structure and Equilibrium Forces of Bovine Submaxillary Mucin Adsorbed at a Solid–Liquid Interface

06-Apr-2015 | Bruno Zappone; Navinkumar J. Patil; Jan B. Madsen; Kirsi I. Pakkanen; Seunghwan Lee, Langmuir, 2015

By combining dynamic light scattering, circular dichroism spectroscopy, atomic force microscopy, and surface force apparatus, the conformation of bovine submaxillary mucin in dilute solution and nanomechanical properties of mucin layers adsorbed on mica have been investigated. The samples were ...

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Unveiling the Structure of Polytetraruthenated Nickel Porphyrin by Raman Spectroelectrochemistry

03-Apr-2015 | Luís M. C. Ferreira; Daniel Grasseschi; Mauro S. F. Santos; Paulo R. Martins; Ivano G. R. Gutz; Ana Maria C. Ferreir ..., Langmuir, 2015

The structure of polytetraruthenated nickel porphyrin was unveiled for the first time by electrochemistry, Raman spectroelectrochemistry, and a hydroxyl radical trapping assay. The electrocatalytic active material, precipitated on the electrode surface after successive cycling of ...

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Preparation of Novel Porphyrin Nanomaterials Based on the pH-Responsive Shape Evolution of Porphyrin Microspheres

02-Apr-2015 | Wenbo Zhang; Lingbo Xing; Haisheng Wang; Xiujun Liu; Yaqing Feng; Changyou Gao, Langmuir, 2015

The shapes and properties of self-assembled materials can be adjusted easily using environmental stimuli. Yet, the stimulus-triggered shape evolution of organic microspheres in aqueous solution has rarely been reported so far. Here, a novel type of poly(allylamine hydrochloride)-g-porphyrin ...

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Interpolymer Complexation: Comparisons of Bulk and Interfacial Structures

01-Apr-2015 | Beatrice Cattoz; Wiebe M. de Vos; Terence Cosgrove; Martin Crossman; Youssef Espidel; Stuart W. Prescott, Langmuir, 2015

The interactions between the strong polyelectrolyte sodium poly(styrenesulfonate), NaPSS, and the neutral polymer poly(vinylpyrrolidone), PVP, were investigated in bulk and at the silica/solution interface using a combination of diffusion nuclear magnetic resonance spectroscopy (NMR), small-angle ...

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Synthesis of Janus-Like Gold Nanoparticles with Hydrophilic/Hydrophobic Faces by Surface Ligand Exchange and Their Self-Assemblies in Water

01-Apr-2015 | Ryo Iida; Hitoshi Kawamura; Kenichi Niikura; Takashi Kimura; Shota Sekiguchi; Yasumasa Joti; Yoshitaka Bessho; Hidey ..., Langmuir, 2015

This study aims at the synthesis of Janus gold nanoparticles (Janus GNPs) with hydrophilic/hydrophobic faces by a simple ligand exchange reaction in an homogeneous system and at the elucidation of the self-assembled structures of the Janus GNPs in water. As hydrophilic surface ligands, we ...

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