Materials Literature
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This paper presents the application of process analytical technology (PAT) tools in combination with solid state analytical (SSA) techniques for the detection of solvent-mediated pseudopolymorphic transformations and the discovery of a new hydrate form of the model system, sodium benzoate in water. Cooling crystalliza…
We review our recent studies on glassy dynamics and glass transition of polymer thin films using neutron and X-ray reflectivity and inelastic neutron techniques. In the last decade extensive studies have been performed on polymer thin films to reveal very interesting but unusual properties such as reduction in the gla…
An amphiphilic diblock codendrimer composed of a third generation poly(methallyl dichloride) end-capped by eight hydroxyl groups (PMDC(OH)(8)) and a second generation poly(urethane amide) end-capped by four alkyl groups (PUA(C16)(4)) were found to self-assemble into highly oriented ribbons at the water-air interface.…
This paper describes a molecular valence tautomeric (VT) bistability synchronized with polymorphic crystal-melt phase transitions of a newly designed VT complex, [Co(C9Espy) 2 (3,6-DTBQ) 2 ] ( CoC9Espy, C9Espy = dinonyl-pyridine-3,5-dicarboxylate and 3,6-DTBQ = 3,6-di- tert -butyl-semiquinonate (3,6-DTBSQ) or catechol…
Insertion of lithium in EuIII0.33Zr2(PO4)3 having NZP structure, using n-butyllithium, has allowed a mixed valent phosphate Li0.1EuII0.1EuIII0.23Zr2(PO4)3 to be synthesized. The presence of mixed valent Eu gave rise to PL emission in the blue-green (Eu2+) and red (Eu3+) regions under 393 nm excitation with the chromat…
We investigate excitation energy transfer between a semiconductor nanocrystal (NC) and an organic dye molecule, using ab initio calculations. The electronic coupling is evaluated based on the full Coulombic interaction between the NC and dye transition densities. We explore the effect of the NC−dye relative configurat…
A coordination gadolinium(III) mononuclear complex involving the new redox-active tetrathiafulvaleneamido-2-pyrimidine-1-oxide is synthesized. The X-ray structure of the 1:3 gadolinium complex [Gd(hfac)(3)(TTF-CONH-2-Pym-1-oxide)(3)](CH(2)Cl(2)).0.5C(6)H(14) reveals that the coordination polyhedron of the paramagnetic…
We describe new topologies in the phase diagrams involving biaxial nematic liquid crystals. We find that a direct isotropic-biaxial nematic phase transition is possible. Our results show that three different biaxial nematic phases can occur. We outline how the novel phase diagrams could be detected experimentally.
Monodisperse protein polymers engineered by biosynthetic techniques are well suited to serve as a basis for creating comb-like polymer architectures for biomaterial applications. We have developed a new class of linear, cationic, random-coil protein polymers designed to act as scaffolds for multivalent display. These…
The use of the binary "blend" of MeCO(2)(-)/pdmH(2) ligands (pdmH(2) = pyridine-2,6-dimethanol) in copper(II) chemistry has provided access to a compound consisting of discrete linear Cu(II)(3) and cubane Cu(II)(4) clusters. The complicated magnetic behavior of the Cu(II)(3) + Cu(II)(4) complex was clarified and inter…
We report on an x-ray photon correlation spectroscopy experiment investigating the surface structure and dynamics of colloidal particles suspended in a supercooled viscous liquid. The static structure factor in the direction parallel and perpendicular to the surface reveals a more disordered structure at the surface a…
Surface modification of semiconductor quantum dots (QDs) often causes a drastic reduction of photoluminescence quantum yield (QY). Here, we report an efficient way to improve photoluminescence (PL) characteristics of silica-coated QDs using the combination of light-induced PL enhancement (photoenhancement) and the sma…
The initial stages of copper corrosion behavior were studied during one year in different zones of Peruvian seawater and marine atmosphere. Several relevant factors control the development of copper corrosion process, such as oxygen content, chloride salinity, periodical cycles of drying-wetness, time of metal wetness…
ZnO nanoporous belts with a smooth surface and high pore density have been successfully synthesized; the simple growth method is applicable to produce high-yield single-crystalline ZnO nanoporous belts with a relatively high purity and at a low cost. The morphology and microstructure and optical properties of ZnO nano…
Superhydrophobic surfaces were prepared on copper foils via a facile assistant surface oxidation technology and subsequent chemical modification with low free energy materials. The three-dimensional (3D) honeycomb-like porous structures made up of nanoslices of hydroxy cupric phosphate heptahydrate (Cu 8 (PO 3 OH) 2 (…
Soft matter such as liquid crystals, polymer solutions and colloidal dispersions are complex fluids that exhibit viscoelasticity. Their macroscopic mechanical properties have been studied intensively in the field of rheology. Recently, the structures and dynamics of soft matter at micro- and nanoscale have attracted c…
Potentiodynamic, impedance measurements were carried out on 304 stainless steel in 0.5N, 1.0, 2.0 and 5.0 N H 2 SO 4 solutions. X-ray photoelectron spectroscopic [XPS] studies carried out on 304 stainless steel in H 2 SO 4 solutions revealed the existence of CrOOH, Cr 2 O 3 , -Fe 2 O 3 , -FeOOH, Mn 2 O 3 , Mn 3 O 4 ,…
An analytical equation of state (EOS) for a hard sphere fluid confined in random porous media is derived by extending the scaled particle theory to such complex systems with quenched disorders. A simple empirical correction allows us to obtain a highly accurate EOS with errors within the simulation ones. These are the…
In this article, the experimental variable-dependent photoluminescence (PL) evolution of transition-metal-doped ZnSe nanocrystals (NCs) is analyzed by combining the redox reaction and the electrostatics of aqueous NCs. Bulk doping of NCs involves two steps − surface adsorption of the metal impurities and the followed…
We have performed low-temperature specific heat and thermal conductivity measurements of the Ni-based superconductor BaNi2As2 (T{c}=0.7 K) in a magnetic field. In a zero field, thermal conductivity shows T-linear behavior in the normal state and exhibits a BCS-like exponential decrease below T{c}. The field dependence…