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Remarkable Distinctions in the Heat-induced Phase Transition Processes of Two Poly(2-isopropyl-2-oxazoline)-based Mixed Aqueous Solutions

03-Mar-2015 | Tianjiao LI; Hui Tang; peiyi wu, Soft Matter, 2015

Detailed phase transition processes of poly (2-isopropyl-2-oxazoline) (PIPOZ)/ Poly (N-isopropylacrylamide) (PNIPAM) and PIPOZ/ poly (N-vinylcaprolactam) (PVCL) mixtures in aqueous solution were investigated by DSC, temperature-variable 1H-NMR, optical microscopy and FT-IR spectroscopy ...


Nanometer-sized dynamic entities in an aqueous system

01-Mar-2015 | E. Mamontov; P. Zolnierczuk; M. Ohl, Physical Chemistry Chemical Physics, 2015

Using neutron spin-echo and backscattering spectroscopy, we have found that at low temperatures water molecules in an aqueous solution engage in center-of-mass dynamics that are different from both the main structural relaxations and the well-known localized motions in the transient cages of the ...


Free Energy Map for the Co-Oligomerization of Formaldehyde and Ammonia

27-Feb-2015 | Jeremy Kua; Alyssa A. Rodriguez; Lily A. Marucci; Melissa M. Galloway; David O. De Haan, Journal of Physical Chemistry A, 2015

Density functional theory calculations, including Poisson–Boltzmann implicit solvent and free energy corrections, are applied to construct a free energy map of formaldehyde and ammonia co-oligomerization in aqueous solution at pH 7. The stepwise route to forming hexamethylenetetramine (HMTA), the ...


Solution structure and DNA binding of the catalytic domain of the large serine resolvase TnpX

26-Feb-2015 | Stephen J. Headey, Andrew Sivakumaran, Vicki Adams, Dena Lyras, Julian I. Rood, Martin J. Scanlon, Matthew C. J. Wilce, Journal of Molecular Recognition, 2015

The transfer of antibiotic resistance between bacteria is mediated by mobile genetic elements such as plasmids and transposons. TnpX is a member of the large serine recombinase subgroup of site‐specific recombinases and is responsible for the excision and insertion of mobile genetic elements ...


A comparative analysis of different measurement techniques to monitor metal and organic contamination in silicon device processing

25-Feb-2015 | M. L. Polignano, D. Codegoni, S. Grasso, I. Mica, G. Borionetti, A. Nutsch, physica status solidi (a), 2015

A few key techniques for the analysis of contamination in silicon are compared for their ability to detect different impurities. Both metal and organic contamination is included in this study. In addition, common contaminants and elements recently introduced in the fabrication process are ...


A novel polyacrylamide‐based superabsorbent with temperature switch for steam breakthrough blockage

25-Feb-2015 | Xiaoyun Zhang, Xiangpeng Wang, Liang Li, Ruonan Wu, Sisi Zhang, Jihui Wu, Wei Wu, Journal of Applied Polymer Science, 2015

ABSTRACT A novel high‐temperature resistant superabsorbent polymer (SAP) with a temperature switch to control its water absorbency was prepared through solution polymerization of acrylamide (AM), using N,N‐methylenebisacrylamide (NMBA) and tetraallylammonium chloride (TAAC) as crosslinking ...


Interaction of PiB‐Derivative Metal Complexes with Beta‐Amyloid Peptide: Selective Recognition of the Aggregated Forms

25-Feb-2015 | André F. Martins, David M. Dias, Jean‐François Morfin, Sara Lacerda, Douglas V. Laurents, Éva Tóth, Carlos F. G. C. ..., Chemistry - A European Journal, 2015

Abstract Metal complexes are increasingly explored as imaging probes in amyloid peptide related pathologies. We report the first detailed study on the mechanism of interaction between a metal complex and both the monomer and the aggregated form of Aβ1–40 peptide. We have studied ...


X-ray Spectroscopy as a Probe for Lithium Polysulfide Radicals

25-Feb-2015 | Tod A Pascal; Chaitanya D Pemmaraju; David Prendergast, Physical Chemistry Chemical Physics, 2015

The discharge mechanism in lithium sulfur batteries is still unknown and has been purported to involve significant concentrations of polysulfide radicals. Methods capable of quantifying these species in solution are therefore of paramount importance to revealing electrochemical pathways. Here we ...


Spatio-temporal correlations in aqueous systems: computational studies of static and dynamic heterogeneity by 2D-IR spectroscopy

25-Feb-2015 | Rikhia Ghosh; Tuhin Samanta; Saikat Banaerjee; Rajib Biswas; Biman Bagchi, Faraday Discussions, 2015

Local heterogeneity is ubiquitous in natural aqueous systems. It can be caused locally by external biomolecular subsystems like proteins, DNA, micelles and reverse micelles, nanoscopic materials etc., but can also be intrinsic to the thermodynamic nature of the aqueous solution itself (like ...


Catalyst Activation, Deactivation, and Degradation in Palladium‐Mediated Negishi Cross‐Coupling Reactions

24-Feb-2015 | Katharina Böck, Julia E. Feil, Konstantin Karaghiosoff, Konrad Koszinowski, Chemistry - A European Journal, 2015

Abstract Pd‐mediated Negishi cross‐coupling reactions were studied by a combination of kinetic measurements, electrospray‐ionization (ESI) mass spectrometry, 31P NMR and UV/Vis spectroscopy. The kinetic measurements point to a rate‐determining oxidative addition. Surprisingly, this step seems ...


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