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Gelation of Fmoc-diphenylalanine is a first order phase transition

26-Aug-2015 | Nikola A. Dudukovic; Charles F. Zukoski, Soft Matter, 2015

We explore the gel transition of the aromatic dipeptide derivative molecule fluorenylmethoxycarbonyl-diphenylalanine (Fmoc-FF). The addition of water to a solution of Fmoc-FF in dimethyl sulfoxide (DMSO) results in increased attractions leading to self-assembly of Fmoc-FF molecules into a ...

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Initial stages of water solvation of stepped platinum surfaces

26-Aug-2015 | Manuel Kolb; Jasper Wermink; Federico Calle-Vallejo; Ludo BF Juurlink; Marc T.M. Koper, Physical Chemistry Chemical Physics, 2015

Platinum is an active catalyst for a large number of (electro)chemical reactions in aqueous solution. The observed catalytic activities result from an interplay between the intrinsic adsorption properties of platinum surfaces and their interaction with the aqueous environment. Although water ...

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Spectroscopic study of cystine adsorption on pyrite surface: From vacuum to solution conditions

23-Aug-2015 | Author(s): M. Sanchez-Arenillas, E. Mateo-Marti, Chemical Physics, 2015

Publication date: 8 September 2015 Source:Chemical Physics, Volume 458 Author(s): M. Sanchez-Arenillas, E. Mateo-Marti We characterized the adsorption of cystine molecules on pyrite surface via X-ray photoelectron spectroscopy. Anoxic conditions were simulated under ultra-high-vacuum ...

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Ultraviolet photopolymerization and performances of fast‐water absorbing sodium polyacrylate

21-Aug-2015 | Banugul Dolat, Amatjan Sawut, Mamatjan Yimit, Ismayil Nurulla, Journal of Applied Polymer Science, 2015

ABSTRACT A kind of fast‐water absorbing sodium polyacrylate was prepared by UV polymerization under no crosslinker or initiator condition. Influence of factors, such as exposure time, neutralization degree, polymerization temperature, and monomer concentration on the absorption rate of the ...

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Affecting the Catalytic Activity of the Known [Ru(tpy)(bpy)(OH2)]2+ Complex in Water Oxidation by Utilization of a Hangman Ligand

21-Aug-2015 | Pierre Wrzolek, Matthias Schwalbe, European Journal of Inorganic Chemistry, 2015

Abstract [Ru(tpy)(bpy)(OH2)]2+ (bpy = 2,2′‐bipyridine, tpy = 2,2′;6′,2″‐terpyridine) is the archetype of many known single‐site ruthenium complexes used for catalytic water oxidation. Its efficiency is likely influenced by installing a proton‐donor/acceptor functionality in proximity to the ...

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Sensitive Colorimetric Detection of Explosive 2,6‐Bis(picrylamino)pyridine after Preconcentration by Dispersive Liquid‐Liquid Microextraction

20-Aug-2015 | Arash Larki, Mehdi Rahimi Nasrabadi, Nahid Pourreza, Propellants, Explosives, Pyrotechnics, 2015

Abstract An experimental investigation for sensitive spectrophotometric detection of explosive, 2,6‐bis(picrylamino)pyridine (BPAP) using dispersive liquid‐liquid microextraction was carried out. Based on this procedure, which is a dispersive‐solvent‐free technique, the extractant is dispersed ...

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Water Processable Polythiophene Nanowires by Photo-Cross-Linking and Click-Functionalization

20-Aug-2015 | Hyeong Jun Kim; Matthew Skinner; Hojeong Yu; Joon Hak Oh; Alejandro L. Briseno; Todd Emrick; Bumjoon J. Kim; Ryan C. ..., Nano Letters, 2015

Replacing or minimizing the use of halogenated organic solvents in the processing and manufacturing of conjugated polymer-based organic electronics has emerged as an important issue due to concerns regarding toxicity, environmental impact, and high cost. To date, however, the processing of ...

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An efficient non‐Newtonian fluid‐flow simulator for variable aperture fractures

19-Aug-2015 | Joseph P. Morris, Gocha G. Chochua, Andrey V. Bogdan, The Canadian Journal of Chemical Engineering, 2015

Abstract Many natural and industrial applications involve non‐Newtonian fluids with high effective viscosity ratios flowing between surfaces with spatial variations in aperture. In particular, hydraulic fracturing operations often require pumping sequences of non‐Newtonian fluids with ...

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Visible‐Light‐Driven Oxidation of Organic Substrates with Dioxygen Mediated by a [Ru(bpy)3]2+/Laccase System

18-Aug-2015 | Ludovic Schneider, Yasmina Mekmouche, Pierre Rousselot‐Pailley, A. Jalila Simaan, Viviane Robert, Marius Réglier, Al ..., ChemSusChem, 2015

Abstract Oxidation reactions are highly important chemical transformations that still require harsh reaction conditions and stoichiometric amounts of chemical oxidants that are often toxic. To circumvent these issues, olefins oxidation is achieved in mild conditions upon irradiation of an ...

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Computational screening of renewably sourced polyalkylene glycol plasticizers for nylon polyamides

18-Aug-2015 | Jarod M. Younker, Raja H. Poladi, Herbert V. Bendler, Hari B. Sunkara, Polymers for Advanced Technologies, 2015

A high‐throughput computational method is used to screen new plasticizers for nylon polyamides. Condensed‐phase molecular dynamic simulations are used to describe the interaction of the plasticizer and the polymer. A radial distribution function is utilized to quantify the degree of hydrogen ...

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