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Showing 1-26 of 26 results for "523356" within Papers
Oleksandr Trotsenko et al.
Langmuir : the ACS journal of surfaces and colloids, 28(14), 6037-6044 (2012-03-15)
Conformations of cationic polyelectrolytes (PEs), a weak poly(2-vinylpyridine) (P2VP) and a strong poly(N-methyl-2-vinylpyridinium iodide) (qP2VP), adsorbed on mica from saline solutions in the presence of counterions of different valences are studied using in situ atomic force microscopy (AFM). Quantitative characteristics
Zhiquan Chen et al.
Langmuir : the ACS journal of surfaces and colloids, 26(11), 8869-8874 (2010-04-15)
We reported the deliberate control on the micelle opening and closing of amphiphilic polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) micellar films by exposing them to selective solvents. We first treated the micellar films with polar solvents including ethanol and water (pH = 4, 8
Sina Burkert et al.
Langmuir : the ACS journal of surfaces and colloids, 26(3), 1786-1795 (2009-09-22)
Protein adsorption, as the primary process occurring when a foreign surface comes into contact with a biosystem, was studied on thin polymer brush films consisting of poly(N-isopropylacrylamide) (PNIPAAm) and poly(2-vinylpyridine) (P2VP). These films were prepared by the "grafting to" method.
Astrid Drechsler et al.
Langmuir : the ACS journal of surfaces and colloids, 28(44), 15555-15565 (2012-10-13)
AFM force measurements have been performed to study the influence of the pH value and salt concentration on the interactions between poly(2-vinyl pyridine) brushes and microsized silica spheres, focusing on attractive and adhesion forces. It was found that the interaction
Felix H Schacher et al.
Nanoscale, 3(1), 288-297 (2010-11-10)
We present a detailed study on the preparation of compartmentalized cylindrical nanoparticles via a templated approach: the polybutadiene part of a linear polybutadiene-block-poly(2-vinyl pyridine)-block-poly(tert-butyl methacrylate) block terpolymer, B420V280T790, having a bulk microstructure with PB cylinders covered by a P2VP double
Karsten Hinrichs et al.
Langmuir : the ACS journal of surfaces and colloids, 25(18), 10987-10991 (2009-07-04)
This work provides direct chemical and structural insight into pH-dependent changes of an ultrathin (d=12 nm) mixed polyelectrolyte brush. In-situ infrared spectroscopic ellipsometry was used for the first time to study the gradual pH-responsive behavior of the brush, constituted of
Lung-Chi Chen et al.
Chemical communications (Cambridge, England), 48(30), 3668-3670 (2012-03-08)
Stereoregular vinyl polymers, poly(2-vinyl pyridine)s (P2VPs), were synthesized to examine the tacticity effect on the induced circular dichroism (ICD) via association with chiral acids. The ICD was found to be strongly dependent on the isotacticity of the P2VPs and the
Kaizhong Fan et al.
Journal of colloid and interface science, 344(1), 112-116 (2010-01-20)
The interaction between negatively charged organic salts, with one two and three sulfonate groups respectively, and positively charged poly(2-vinylpyridine) microgel particles has been investigated. Absorption isotherms are used to describe the uptake of organic salt into the microgel network and
Joseph P Cook et al.
Advances in colloid and interface science, 147-148, 67-73 (2008-12-27)
The effect of perchlorate ions as counterions in the acid-induced swelling of poly(2-vinylpyridine) microgel particles was investigated. The pH was modified with perchloric, hydrochloric and hydrobromic acids and the particle diameter measured using dynamic light scattering and the viscosity monitored
Mikhail Motornov et al.
Nanotechnology, 20(43), 434006-434006 (2009-10-06)
A pH-responsive mixed polyelectrolyte brush from tethered polyacrylic acid (PAA) and poly(2-vinylpyridine) (P2VP) (PAA:P2VP = 69:31 by weight) was prepared and used for selective gating transport of anions and cations across the thin film. An ITO glass electrode was modified
Andreas Walther et al.
Chemical communications (Cambridge, England), (9)(9), 1127-1129 (2009-02-20)
We report on the unexpected finding of the formation of hydrophobic bridges between polybutadiene patches of multicompartment micelles based on amphiphilic miktoarm star terpolymers in water.
Yuri Roiter et al.
Nanoscale, 4(1), 284-292 (2011-11-15)
The mechanism of nanoparticle actuation by stimuli-responsive polymer brushes triggered by changes in the solution pH was discovered and investigated in detail in this study. The finding explains the high spectral sensitivity of the composite ultrathin film composed of a
Mohammad Changez et al.
Advanced materials (Deerfield Beach, Fla.), 24(24), 3253-3257 (2012-05-19)
The reaction between atactic poly(2-vinylpyridine) and 1,4-dibromobutane leads to formation of long-range 3D molecular ordering in polymer chains mainly because the side group (pyridine) of the polymer chain changes to a syndotactic configuration. This may enable the production of functional
Keewook Paeng et al.
The Journal of chemical physics, 134(2), 024901-024901 (2011-01-19)
A temperature-ramping anisotropy measurement is introduced as an efficient way to study molecular motion in polymer glasses. For these experiments, fluorescent molecules were dispersed in the polymer glass and the reorientation of these dyes was used as a probe of
Shengqin Wang et al.
The Journal of chemical physics, 126(9), 091104-091104 (2007-03-17)
By measuring diffusion rate, the conformation change of single poly(2-vinylpyridine) chain in aqueous solution was studied by fluorescence correlation spectroscopy. The data showed a stepwise change of hydrodynamic radius when pH value was tuned, reflecting a sign of first-order conformation
Weihua Tao et al.
Journal of hazardous materials, 175(1-3), 111-116 (2009-11-03)
In the present study, the performance, behavior and mechanism of synthetic poly(2-vinylpyridine) resin (WH-225) adsorbing 5-sodiosulfoisophthalic acids (SIPA) from the aqueous solution were investigated, and two commercial adsorbents, namely, hypercrosslinked adsorbent NDA-100 and macroporous adsorbent XAD-4 were employed as reference.
Tianying Jiang et al.
Journal of physics. Condensed matter : an Institute of Physics journal, 24(37), 375109-375109 (2012-08-24)
Here we investigate the flow properties of suspensions of dicolloidal particles composed of interpenetrating spheres where one sphere is rich in polystyrene and the second is rich in poly 2-vinyl pyridine. The synthesis method is designed to create both anisotropic
Andrew C Miller et al.
Biomacromolecules, 10(4), 732-741 (2009-02-25)
Biocompatible oils are used in a variety of medical applications ranging from vaccine adjuvants to vehicles for oral drug delivery. To enable such nonpolar organic phases to serve as reservoirs for delivery of hydrophilic compounds, we explored the ability of
Volodymyr Tsyalkovsky et al.
Langmuir : the ACS journal of surfaces and colloids, 26(13), 10684-10692 (2010-05-14)
Fluorescent silica nanoparticles decorated with a responsive shell, a mixed polymer brush, were synthesized. Specifically, a poly(2-vinylpyridine), P2VP, and poly(ethylene glycol), PEG, binary polymer brush was synthesized on silica nanoparticles via the "grafting to" technique. The selection of the components
M Serdar Onses et al.
Langmuir : the ACS journal of surfaces and colloids, 28(18), 7299-7307 (2012-04-14)
Chemical patterns consisting of poly(2-vinyl pyridine) (P2VP) brushes in a background of a cross-linked polystyrene (PS) mat enabled the highly selective placement of citrate-stabilized Au nanoparticles (NPs) in arrays on surfaces. The cross-linked PS mat prevented the nonspecific binding of
Kensuke Akamatsu et al.
Langmuir : the ACS journal of surfaces and colloids, 26(2), 1254-1259 (2009-10-13)
The synthesis of composite microgels consisting of pH-responsive latexes with gold nanoparticles was investigated along with the optical properties of the products. The gold nanoparticles were deposited by wet chemical reduction from gold ions adsorbed in cross-linked poly(2-vinylpyridine) latexes, by
Shengqin Wang et al.
The Journal of chemical physics, 129(24), 241102-241102 (2009-01-07)
Fluorescence measurements with single-molecule sensitivity are used to measure the hydrodynamic size and local pH of a weak polyelectrolyte, poly-2-vinyl pyridine end labeled with pH-sensitive dye, the polyelectrolyte having concentration so low (nanomolars) that molecular properties are resolvable only from
Christopher J Thode et al.
Nanotechnology, 24(15), 155602-155602 (2013-03-23)
A chemical pattern consisting of end-grafted polystyrene brushes (20 nm lines on a 40 nm pitch) on the native oxide of silicon wafers was defined by molecular transfer printing from assembled block co-polymer films. End-grafted hydroxyl-terminated poly(2-vinyl pyridine) brushes were selectively deposited
Natalia Kocharova et al.
Langmuir : the ACS journal of surfaces and colloids, 23(6), 3363-3371 (2007-02-13)
We report the efficient aqueous dispersion of pristine HiPco single-walled carbon nanotubes (SWNTs) with ionic liquid (IL)-based surfactants 1-dodecyl-3-methylimidazolium bromide (1) and 1-(12-mercaptododecyl)-3-methylimidazolium bromide (2), the thiolation of nanotube sidewalls with 2, and the controlled self-assembly of positively charged SWNT-1,2
Hui Yang et al.
Journal of nanoscience and nanotechnology, 10(10), 6340-6347 (2010-12-09)
The synthesis of gold nanoparticles (AuNPs) by UV irradiation of the solution of polystyrene-block-poly(2-vinyl pyridine)/HAuCl4 (PS-b-PVP/HAuCl4) complexes was investigated. AuNPs with block copolymer shell structures can be easily generated by simply control of the block copolymer concentration and the loading
Rattanon Suntivich et al.
Langmuir : the ACS journal of surfaces and colloids, 27(17), 10730-10738 (2011-07-28)
We report on the growth of gold nanoparticles in polystyrene/poly(2-vinyl pyridine) (PS/P2VP) star-shaped block copolymer monolayers. These amphiphilic PS(n)P2VP(n) heteroarm star copolymers differ in molecular weight (149,000 and 529,000 Da) and the number of arms (9 and 28). Langmuir-Blodgett (LB)
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