Materials Literature
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We have investigated the texture and shell microstructure together with the individual hardness distribution patterns of recent calcitic brachiopods of the species Kakanuiella chathamensis, Liothyrella uva and Liothyrella neozelanica. One of the most distinctive features of the studied species is the number of layers…
We report that the major features in the temperature dependence of dc and ac magnetization of a well-known spin-chain compound, Ca3Co2O6, which has been known to exhibit two complex magnetic transitions due to geometrical frustration (one near 24 K and the other near 10 K), are found to be qualitatively unaffected in…
Dados sobre a composição mineralógica dos solos das serras litorâneas do sul de Santa Catarina são escassos. Este trabalho objetivou caracterizar, do ponto de vista morfológico, físico e químico, perfis de solo representativos desta região, bem como identificar os componentes mineralógicos desses solos e suas relações…
Dynamic intracellular analysis has important applications in areas like biomedical research, defense and security and many others. Although, there are several methods for intracellular analysis, surface enhanced Raman scattering (SERS) is becoming a preferred transduction method for such applications, due to its narro…
We present a methodology to extract the single-crystal phonon dispersion from polycrystalline materials. The approach consists of recording inelastic x-ray scattering (IXS) spectra over a large momentum transfer region (typically $2--80\text{ }{\text{nm}}^{\ensuremath{-}1}$), and confront them with a model calculation…
Crystalline nanodimensional particulates of ceria have been obtained in the form of conformal thin films at the interface of two immiscible liquids. For the first time, interfacial deposition has been accomplished by the use of a simple phase transfer process eliminating the need to synthesize metal precursors. The ob…
Although neat gold−thiolate oligomers and polymers made of linear S−Au−S bonds have been well-known, observation of RS−Au−SR linear complexes (RS− being an alkylthiolate group) on Au(111) has been reported only recently. On the basis of the unique geometry and bonding of the RS−Au−SR complex on Au(111), we construct s…
Resonance enhanced multiphoton ionization spectra of vanadium monoxide (VO) have been measured in the 16,000-23,300 cm(-1) region. A series of intense peaks, identified as the VO C (4)Sigma(-) (v('))-X (4)Sigma(-) (v(")=0) progression, has been recorded up to v(')=7 and vibrational and rotational parameters have been…
We report unexpectedly strong variations in the quasielastic scattering (QES) intensity in glasses under pressure. Analysis of the data reveals strong correlations between pressure-induced changes in the QES intensity and the intensity of the boson peak. This observation emphasizes a direct relationship between these…
Metalation of meso-free 5,10,20,25-tetrakis(pentafluorophenyl)-substituted [26]hexaphyrin(1.1.1.1.1.1) (4) with Cu(II) and Zn(II) ions afforded homodinuclear complexes 6 and 7, respectively. A demetalation-remetalation protocol provided monozinc(II) complex 9 selectively, from which copper(II)-zinc(II) heterodinuclear…
Reproducible alignment and complete inclusion of ordered mesoporous structures into anodic aluminum oxide (AAO) is still a challenging nanofabrication process. Hierarchical nanostructures of ordered mesoporous silica (OMS) in AAO channels were prepared directly on conducting substrates by electrophoretic deposition of…
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…