Materials Literature
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Here we report on the synthesis of CdSe quantum dots from a noncoordinating solvent. We show that nucleation and growth is very fast and is completed within 100 s. The subsequent increase in average particle size is due to diffusion limited coarsening. Growth and coarsening can be quenched by injection of dodecanethio…
Thorough analyses of X-ray diffraction patterns of syndiotactic polystyrene (s-PS) films, exhibiting different crystalline and co-crystalline phases, and related evaluations of degrees of orientation have allowed to give a more accurate as well as simpler description of the three known uniplanar orientations. This new…
The electronic structures of chromium and vanadium centers coordinated by three reduced 1,2-diketones have been elucidated by using density functional theory (DFT) calculations and a host of physical methods: X-ray crystallography; cyclic voltammetry; ultraviolet-visible (UV-vis), nuclear magnetic resonance (NMR), and…
Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe 2 As 2 into a superconductor with T c exceeding 20 K. We carried out systematic transport measurements of BaFe 2− x Co x As 2 superconductors in pressures up to 2.5 GPa, and elucidated the int…
A variety of calcium carbonate (CaCO 3 ) biominerals are now thought to be formed via an amorphous precursor pathway. Our group has been using in vitro model systems to examine potential crystallochemical reactions that might occur during biomineralization and, in particular, has proposed that a polymer-induced liquid…
Cationic ring-opening polymerization of oxygen-containing heterocycles may proceed either by active chain end (ACE) mechanism or by activated monomer (AM) mechanism for which the presence of terminal HO group is required. Typically, ACE mechanism is favored. Cationic polymerization of L,L-lactide seems to be an excep…
We propose a model for the Fe atomic displacements in the low-temperature phase of magnetite $({\text{Fe}}_{3}{\text{O}}_{4})$, based on the analysis of the photon energy dependence of the scattered intensity of selected reflections in a resonant x-ray scattering experiment. The symmetry of the displacement pattern is…
A dithiocarbamate-based methodology is employed to prepare linked heteromultimetallic complexes and then further exploited in the surface functionalisation of gold nanoparticles.
We characterize terahertz metamaterials by applying apertureless near-field microscopy with a bandwidth that covers the entire spectral response of the structures. The observations agree with the interpretation of the fundamental mode of the metamaterial. But the high frequency resonance shows properties that deviate…
The electrical characteristics and stability of Pd and Au Schottky contacts on ZnO nanorods grown on glass substrate have been investigated. The nanorods were grown using the aqueous chemical growth method. The nanorods were characterized with scanning electron microscopy (SEM), x-ray diffraction (XRD) and photolumine…
LiBH 4, as a potential material with the highest reversible hydrogen storage capacity for hydrogen vehicle applications, has always been hydrogenated and dehydrogenated in the liquid state. In this study, we demonstrate, for the first time, that 8.3 wt % hydrogen uptake can be obtained from the LiBH 4 + MgH 2 system i…
Porcine pepsin was immobilized inside the SBA-15 mesoporous silica system through physical adsorption. A grafting step with 3-aminopropryltriethoxysilane (APTES) was performed to reduce the pore openings of the host material, in order to minimize the enzyme leaching. A detailed physical chemical characterization of hy…
In the field of the specific immobilization of actinides, several phosphate-based ceramics have already been proposed as suitable candidates. Among them, britholite and monazite/brabantite (now called monazite/cheralite) solid solutions have been considered as serious candidates on the basis of several properties of i…
Abstract The piezoelectric properties of the cobalt‐modified sodium bismuth titanate (Na 0.5 Bi 4.5 Ti 4 O 15 , NBT) piezoelectric ceramics were investigated. The piezoelectric properties of NBT ceramics were significantly enhanced by cobalt modification. The Curie temperature T C and piezoelectric constant d 33 for t…
The fac-[Re(CO)3(Me4phen)(trans-L)]+ complexes, Me4phen = 3,4,7,8-tetramethyl-1,10-phenanthroline and L = 4-styrylpyridine, stpy, or 1,2-bis(4-pyridyl)ethylene, bpe, were synthesized and characterized by their spectroscopic,photochemical, and photophysical properties. The complexes exhibit trans-to-cis isomerization u…
We present the synthesis and comprehensive characterization of dumbbell-shaped polyelectrolyte brushes (DPB). The core of these particles consists of poly(methyl methacrylate) (PMMA) and poly(styrene) onto which a dense brush shell of poly(styrene sulfonate) is grafted. The morphology of DPB particles is studied in so…
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Porous anodic aluminum oxide (AAO) Bragg stacks were fabricated by a modified two-step anodization, and the optical transmittance spectra of AAO Bragg stacks soaking in varied analytes (air, series of alcohols and alkanes) were collected. The results show that both the wavelength and the intensity of the reflected lig…
The influence of thioalkyl acid ligand was evaluated during aqueous synthesis at 100 °C and under hydrothermal conditions (150 °C) of CdTe and CdSe quantum dots (QDs). Experiments performed with 3-mercaptopropionic acid (MPA), 6-mercaptohexanoic acid (MHA) and 11-mercaptoundecanoic acid (MUA) demonstrated that the use…
In this paper we describe a graft polymerization/solvent immersion method for generating various patterns of polymer brushes. We used a very-large-scale integration (VLSI) process to generate well-defined patterns of polymerized methyl methacrylate (MMA) on patterned Si(100) surfaces. A monolayer of Si(CH 3 ) 3 groups…