Materials Literature
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A series of well-defined functional gelable diblock copolymers, poly(3-(triethoxysilyl)propyl methacrylate)- block -poly(2-vinylpyridine) (PTEPM- b -P2VP), were synthesized by a two-step reversible addition−fragmentation chain transfer (RAFT) mediated radical polymerization procedure. The self-assembly of PTEPM- b -P2…
The structure and mechanical properties of clay nanoparticles is a subject of growing interest because of their numerous applications in engineering. We present the results of molecular dynamics simulation for a single nanoplate of pyrophyllite - a 2:1 clay mineral consisting of two tetrahedral sheets of SiO4 and an i…
The properties of thermally reversible organogels that are formed spontaneously upon mixing a phosphonic acid monoester, monophosphonic acid, or bisphosphonate ester, each containing a long alkyl chain substituent, with one of several compounds of aluminum(III) and boron(III) in an organic liquid were studied by IR, N…
Wedge-shaped molecules with a sulfonic group at the tip have been incorporated into a poly(2-vinylpyridine)- b -poly(ethylene oxide) (P2VP- b -PEO) diblock copolymer via proton transfer at different degrees of neutralization. The protonation of P2VP was monitored by means of Fourier transform infrared spectroscopy and…
The fluorescence signal of single organic fluorophores is characterized by random blinking and irreversible photobleaching. Photoinduced blinking of Cy5 has posed various limitations of this popular near-infrared (NIR) probe in biological applications. Here we show that fluorophore-metal nanoparticle (NP) complexes gr…
This paper describes a general method to change the surface property of the oleic acid stabilized silver nanoparticles and successful tranferring of the silver nanoparticles from the organic phase into the aqueous phase. By vigorous shaking of a biphasic mixture of the silver organosol protected with oleic acid and p-…
Nanosized barium titanate powders were synthesized by a hydrothermal method. The effect of titania precursors on the phase transition of BaTiO 3 with respect to Ba/Ti ratio, reaction temperature, reaction time, and calcination temperature was investigated. The synthesized materials were characterized by X-ray diffract…
The reactions of BF 3 ·OEt 2 with four triaryl corroles (H 3 Cor) give the complexes [(B 2 OF 2 )(Cor)] - in which the corrole acts as a binucleating ligand. The new complexes were fully characterized, including an X-ray crystal structure of the triphenylcorrole complex. Density functional theory calculations support…
Highly selective enrichment of (6,5) and (8,3) SWCNTs (above 85% of the semiconducting tubes) was achieved through multistep extraction by sodium dodecyl sulfate (SDS) and sodium cholate (SC) cosurfactant solution from narrowly (n,m) distributed SWCNTs produced by the catalyst Co-MCM-41. A systematic change in the chi…
Capillary electrophoresis (CE) with laser-induced fluorescence (LIF) detection was used to separate different bioconjugated CdSe/ZnS quantum dots (QDs). The QD nanocrystals studied were conjugated to the biomolecules streptavidin, biotin, and immunoglobulin G. The bioconjugated QDs showed different electrophoretic mob…
Silver nanoparticles tagged with dyes and encapsulated within a silica layer, offer a convenient potential substrate for performing multiplexed surface-enhanced Raman scattering (SERS) analysis. In contrast to our earlier work with gold particles, aggregation of silver particles is found to be mostly independent of dy…
We present here a synthetic method for fabricating hollow magnetic mesoporous nanocomposites (diameter ∼ 400 nm) made up of ferrite nanoparticles incorporated to the mesoporous shell (shell thickness ∼ 50 nm) of carbon capsules. This methodology has been applied to the insertion of different ferrites such as iron oxid…
The destabilization approach for SiO 2 -doped LiBH 4 hydrogen storage composite is identified as 4LiBH 4 + 2SiO 2 → Li 4 SiO 4 + 4B + Si + 8H 2, and Li 4 SiO 4 is the thermodynamic obstacle for its reverse action. TiF 3 was doped in the composite for avoiding the formation of Li 4 SiO 4 and thus enhancing the reversib…
Crystalline Pt nanoparticles were electrolessly deposited on poly(acrylic acid) (PAA) grafted multiwalled carbon nanotubes (MWNTs). The density and uniformity of Pt nanoparticles on MWNTs were found dependent on the PAA grafting density, while their morphologies were tailored by the addition of NO 3 − and Cu 2+ ions.…
A series of aromatic/aliphatic poly(propylene terephthalate- co -succinate) (PPTSu) random copolyesters of high molecular weight were synthesized. Enzymatic hydrolysis study showed that copolymers with terephthalate content up to 60 mol % could be hydrolyzed. Cocrystallization, thermal behavior, and spherulitic morpho…
Activities of vacancy defects in carbon nanotubes have been directly monitored by in situ high-resolution transmission electron microscopy at elevated temperatures. Adatom-vacancy pair defects are first prolific due to the knock-on damage, and then the induced vacancies indeed grow up to 1-2 nm in the size by the foll…
The four-step, double-autocatalytic mechanism for transition-metal nanocluster nucleation, growth, and agglomeration described previously has been found to be more general; specifically, the four-step mechanism is shown to apply to the reduction of five transition metals that were examined—Pt, Ru, Ir, Rh, and Pd—under…
Self-consistent-field theory is used to predict the center-of-mass distribution of spherical nanoparticles embedded in the lamellar phase of a diblock copolymer melt. The calculation is performed in the dilute limit, where the particle−particle interactions have a negligible effect on the distribution. We investigate…
Zigzag graphene nanoribbons with saturated edges are investigated by first principles calculations. In these structures edge carbons have either two H or two F atoms, and are of sp(3) type. Compared to the previously studied ribbons with all carbons of sp(2) type, several similarities and differences are found. Specif…
The effect of side chain to charge ratio on the frictional properties of adsorbed layers formed by bottle-brush polyelectrolytes with poly(ethylene oxide) side chains has been investigated. The brush polyelectrolytes were preadsorbed from 0.1 mM NaNO(3) solutions onto mica and silica surfaces; the interfacial friction…