Materials Literature
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Silver metal nanocrystals with passivating ligand shells of dodecanethiol were synthesized by a one-phase wet chemical method. Postsynthesis thermochemical processing, known as digestive ripening, was used to focus the size distribution from a very broad distribution to 5.6 ± 0.4 nm. Chemical analysis of the final Ag…
A novel chiral orthoborate, KMgBO(3), has been successfully synthesized via a standard solid-state reaction, and the crystal structure has been determined from powder X-ray diffraction data. It crystallizes in the cubic chiral space group P2(1)3. Isolated [BO(3)](3-) anionic groups, which are the fundamental building…
Remarkable structural changes take place during the metal to insulator first-order transition in ${\text{Pr}}_{0.50}{\text{Ca}}_{0.50}{\text{CoO}}_{3}$: a contraction of the unit-cell volume, the bending of the Co-O-Co bond angle, and a decrease in (Pr,Ca)-O bond distance. However, the Co-O bond length and the volume…
Multiarm star polymers are model systems with tunable intermediate colloid to polymerlike character, exhibiting rich phase behavior, internal relaxations, and flow properties. An important puzzle for several years has been the lack of clear experimental proof of crystalline states despite strong theoretical prediction…
The adsorption of strongly charged polyelectrolyte chains to an oppositely charged planar surface is studied using computer simulation. In addition to an explicit solvent model, two implicit solvent models are considered: one where the solvent induces an implicit Lennard-Jones (ILJ) interaction between polymer sites a…
La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) hollow fiber membrane precursors were prepared by spinning a starting suspension containing 68.75 wt % LSCF powders, 6.25 wt % polyethersulfone (PESf), and 25.0 wt % N -methyl-2-pyrrolidinone (NMP) at room temperature using deionized water and tape water as the internal and ext…
We studied the spatial profiles and time traces of the photoluminescence (PL) intensity of suspended single-walled carbon nanotubes (SWNTs) using a microscopic PL imaging technique. These PL images, obtained in different gases, showed that adsorbed oxygen molecules act as PL quenchers in SWNTs. The exciton transport l…
Here we extend the plasmonic cloaking technique to irregularly shaped objects with anisotropic scattering response. The scattering-cancellation approach to cloaking [A. Alù and N. Engheta, Phys. Rev. E 72, 016623 (2005)] has been extensively applied in the past to symmetrical geometries and canonical shapes. However,…
One of the characteristic features of polymer dynamics is the existence of additional relaxation processes that are related to connectivity of monomers in polymer chain and are absent in small molecular liquids. These processes are usually described as purely entropic Rouse modes and appear on time scales much longer…
We describe a series of nine new complex salts in which electron-rich Ru(II) or Fe(II) centers are connected via pi-conjugated bridges to six electron-accepting N-methyl-/N-arylpyridinium groups. This work builds upon our previous preliminary studies (Coe , B. J. J. Am. Chem. Soc. 2005, 127, 13399-13410; J. Phys. Chem…
Thermal interface conductance was measured for soluble gold nanorods (NRs) coated with mercaptocarboxylic acids (HS-(CH(2))(n)COOH, n = 5, 10, 15), thiolated polyethylene glycols (MW = 356, 1000, 5000), and HS-(CH(2))(15)-COOH-coated NRs further coated with alternating layers of poly(diallyldimethylammonium chloride)…
A robust and straightforward strategy allowing the controlled confinement of metal nanoparticles within the 3D framework of mesoporous films is presented. The chemical methodology is based on the inner surface modification of mesoporous silica films with polyelectrolyte brushes. We demonstrate that the macromolecular…
Macromolecular cell surface modification techniques have shown tremendous utility in various biomedical applications. However, a major drawback concerns inefficient cell surface modification caused by the poor association of hydrophilic macromolecules with cell surfaces. Here, a novel, highly efficient, and universal…
Highly charged: Electrospray-ionization mass spectrometry shows that single-stranded oligonucleotide dC12-encapsulated silver nanoclusters contain Ag64+ cores at basic pH values (see section of spectrum). The high positive charge of the cluster cores is presumably essential for preventing the multiply deprotonated dC1…
The chiral components in the magnetic order in multiferroic ${\text{MnWO}}_{4}$ have been studied by neutron diffraction using spherical polarization analysis as a function of temperature and of external electric field. We show that sufficiently close to the ferroelectric transition at $T=12.3\text{ }\text{K}$ it is p…
A newly synthesized benzoic−triazole derivative 3,5-dimethylbenzoic acid [1,2,4]triazol-1-ylmethyl ester (DBT) was investigated as a corrosion inhibitor of mild steel in 1 M HCl solution using weight loss measurements, potentiodynamic polarization, SEM, and EIS methods. The results revealed that DBT was an excellent i…
Lactate (LA)-polymerizing enzyme (LPE) is a newly established class of polyhydroxyalkanoate (PHA) synthase, which can incorporate LA units into a polymer chain. We previously synthesized P(LA-co-3-hydroxybutyrate)s [P(LA-co-3HB)s] in recombinant Escherichia coli using the first LPE, which is the Ser325Thr/Glu481Lys mu…
Superconducting ${\mathrm{LaFeAsO}}_{1\ensuremath{-}x}{\mathrm{F}}_{x}$ thin films were grown on single crystalline ${\mathrm{LaAlO}}_{3}$ substrates with critical temperatures (onset) up to 28 K. Resistive measurements in high magnetic fields up to 40 T reveal a paramagnetically limited upper critical field ${\ensure…
Abstract Novel, thiol‐functionalized, and superparamagnetic, silica composite nanospheres (SH‐SSCNs) with diameters smaller than 100 nm are successfully fabricated through the self‐assembly of Fe 3 O 4 nanoparticles and polystyrene 100 ‐ block ‐poly(acrylic acid) 16 and a subsequent sol‐gel process. The size and magne…
We present a first-principles density functional theory study of doped ZnO with focus on its application as a transparent conducting oxide, having both high optical transparency and high electrical conductivity. Investigated is the impact of grain boundaries on the physics of atomic defects, and especially the formati…