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Theory of colloid depletion stabilization by unattached and adsorbed polymers

30-Sep-2015 | A. N. Semenov; A. A. Shvets, Soft Matter, 2015

The polymer-induced forces between colloidal particles in a semidilute or concentrated polymer solution are considered theoretically. This study is focussed on the case of partially adsorbing colloidal surfaces involving some attractive centers able to trap polymer segments. In the presence of ...


Reactive Magnetospinning of Nano‐ and Microfibers

25-Sep-2015 | Alexander Tokarev, Oleksandr Trotsenko, Darya Asheghali, Ian M. Griffiths, Howard A. Stone, Sergiy Minko, Angewandte Chemie International Edition, 2015

Abstract Reactive spinning of nano‐ and microfibers that involves very fast chemical reactions and ion exchange is a challenge for the common methods for nanofiber formation. Herein, we introduce the reactive magnetospinning method. This procedure is based on the magnetic‐field‐directed ...


Two-dimensional MoS2-assisted immediate aggregation of Poly-3-hexylthiophene with high mobility

24-Sep-2015 | Yingying Zhang; Shuang Liu; Wenqing Liu; Tao Liang; Xi Yang; Mingsheng Xu; Hongzheng Chen, Physical Chemistry Chemical Physics, 2015

Nanoscale morphology is of significance to the electronic properties of semiconducting polymers. Solution-processed poly-3-hexylthiophene (P3HT) has been demonstrated as a promising active-layer material in organic thin film transistors (OTFTs) and solar cells. The controlling of crystallinity of ...


Crystal growth of progesterone metastable and stable polymorphs by polymer induced herteronucleation (PIHn) method

22-Sep-2015 | Andrea Mariela Araya‐Sibaja, Valdir Soldi, Carlos Eduardo Maduro Campos, Simone Gonçalves Cardoso, Silvia Lucia Cuffini, Crystal Research and Technology, 2015

The selective crystallization of progesterone polymorphs prepared by Polymer‐Induced Heteronucleation (PIHn) method was investigated. Polyvinyl alcohol (PVA), hydroxypropyl methylcellulose (HPMC), dextran, gelatin, polyisoprene (PI), and acrylonitrile/butadiene copolymer (NBR) were used as ...


Effects of Electric Charge on the Interfacial Tension between Coexisting Aqueous Mixtures of Polyelectrolyte and Neutral Polymer

22-Sep-2015 | Mark Vis; Vincent F. D. Peters; Edgar M. Blokhuis; Henk N. W. Lekkerkerker; Ben H. Erné; R. Hans Tromp, Macromolecules, 2015

Upon demixing, an aqueous solution of a polyelectrolyte and an incompatible neutral polymer yields two phases separated by an interface with an ultralow tension. Here, both in theory and experiment, we study this interfacial tension in detail: how it scales with the concentrations of the polymers ...


Control of Molecular Rotor Rotational Frequencies in Porous Coordination Polymers Using a Solid-Solution Approach

21-Sep-2015 | Munehiro Inukai; Tomohiro Fukushima; Yuh Hijikata; Naoki Ogiwara; Satoshi Horike; Susumu Kitagawa, Journal of the American Chemical Society, 2015

Rational design to control the dynamics of molecular rotors in crystalline solids is of interest because it offers advanced materials with precisely tuned functionality. Herein, we describe the control of the rotational frequency of rotors in flexible porous coordination polymers (PCPs) using a ...


Scaling of Polymer Dynamics at an Oil–Water Interface in Regimes Dominated by Viscous Drag and Desorption-Mediated Flights

18-Sep-2015 | Dapeng Wang; Renfeng Hu; Joshua N. Mabry; Bing Miao; David T. Wu; Kaloian Koynov; Daniel K. Schwartz, Journal of the American Chemical Society, 2015

Polymers are found near surfaces and interfaces in a wide range of chemical and biological systems, and the structure and dynamics of adsorbed polymer chains have been the subject of intense interest for decades. While polymer structure is often inferred from dynamic measurements in bulk ...


Stretching of Collapsed Polymers Causes an Enhanced Dissipative Response of PNIPAM Brushes near their LCST

16-Sep-2015 | Yunlong Yu; Bernard D. Kieviet; Fei Liu; Igor Siretanu; Edit Kutnyánszky; G. Julius Vancso; Sissi de Beer, Soft Matter, 2015

Poly(N-isopropyl acrylamide) (PNIPAM) is a stimulus-responsive polymer that can switch in water from an expanded state below the lower critical solution temperature (LCST) of 32 °C to a globular state above the LCST. It was recently shown, that, as a consequence of this conformational transition, ...


Slowed Diffusion and Excluded Volume Both Contribute to the Effects of Macromolecular Crowding on Alcohol Dehydrogenase Steady-State Kinetics

16-Sep-2015 | Samuel H. Schneider; Schuyler P. Lockwood; Dominique I. Hargreaves; David J. Slade; Micaela A. LoConte; Bridget E. L ..., Biochemistry, 2015

To understand the consequences of macromolecular crowding, studies have largely employed in vitro experiments with synthetic polymers assumed to be both pure and “inert”. These polymers alter enzyme kinetics by excluding volume that would otherwise be available to the enzymes, substrates, and ...


Isolation of Pristine Electronics Grade Semiconducting Carbon Nanotubes by Switching the Rigidity of the Wrapping Polymer Backbone on Demand

15-Sep-2015 | Yongho Joo; Gerald J. Brady; Matthew J. Shea; M. Belén Oviedo; Catherine Kanimozhi; Samantha K. Schmitt; Bryan M. Wo ..., ACS Nano, 2015

Conjugated polymers are among the most selective carbon nanotube sorting agents discovered and enable the isolation of ultrahigh purity semiconducting singled-walled carbon nanotubes (s-SWCNTs) from heterogeneous mixtures that contain problematic metallic nanotubes. The strong selectivity though ...


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