Materials Literature
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Low-frequency Raman scattering due to acoustic phonons is studied for silicon nanostructures. The lineshapes of the first-order Raman active modes exhibit asymmetry. A tail is observed toward low frequency and high frequency for the optic mode and acoustic mode, respectively. The Raman lineshapes of these modes are de…
Time-dependent laser reflectometry measurements are presented as a means to rigorously characterize analyte diffusion dynamics of small molecules from mesoporous silicon (PSi) films for drug delivery and membrane physics applications. Calculations based on inclusion of a spatially and temporally dependent solute conce…
A densely packed colloidal suspension, called as a paste, remembers the direction of external mechanical fields, such as flow and vibration. When the pastes are dried, memories in pastes are visualized as macroscopically anisotropic crack patterns, such as lamellar, radial, ring and spiral. Here, we experimentally inv…
The influence of the surface structure and vibration mode on the resistivity of Cu films and the corresponding size effect are investigated. The temperature dependent conductivities of the films with different surface morphologies are calculated by the algorithm based upon the tight-binding linear muffin-tin orbital m…
We have studied the relaxation dynamics from the photo-induced state in the spin crossover complex [FeH 2 L 2-Me ](ClO 4 ) 2 by magnetic susceptibility and X-ray diffraction measurements. Just after turning off the laser irradiation, the photo-induced high-spin state immediately starts relaxing back to the low-spin st…
Abstract We propose here a significantly improved process for the preparation of a lactide‐clay intercalated mixture, which yields a high molecular weight (MW, M n ∼ 126,000 Da) poly( L ‐lactic acid) (PLLA) clay nanocomposite (PLACN) in short times of in situ ring opening polymerization (ROP). In situ ROP using such a…
The effect of W on the nanovoid formation in annealed amorphous Al2O3 was studied by transmission electron microscopy and molecular dynamics simulations. A comparison of the void formation behavior in electron-beam deposited Al2O3 (without W) and resistance-heating deposited Al2O3 (with 10 at. % W) revealed that W enh…
Monodispersed ferrite nanoparticles of Fe3O4, MnFe2O4, and CoFe2O4 (near to 10 nm), were synthesized by organometallic synthesis, showing the same homogeneous chemical, morphological, and crystalline characteristics. The study and correlation of the thermal relaxation processes were analyzed through static and dynamic…
This work examines the recent developments in non-traditional catalyst-assisted chemical vapour deposition of carbon nanotubes (CNTs) with a view to determining the essential role of the catalyst in nanotube growth. A brief overview of the techniques reliant on the structural reorganization of carbon to form CNTs is p…
A simple, reliable and potentially cost-effective composite film casting procedure is presented using the evaporation of solvent (water) from a dilute mixture of multiwalled carbon nanotubes (MWCNTs) and polyethylene oxide (PEO) polymer. It is found that the fabrication method develops excellent dispersion of MWCNTs i…
Cellulose is the most abundant organic compound on earth and is present in a wide variety of living species, such as animals, plants and bacterial (Tingaut et al., 2010; ElazzouziHafraoui et al., 2008). This linear polymer is constituted of repeating ┚-D-glucopyranosyl units joined by 1→4-glycosidic linkages. The mole…
Measurements are presented of the complex dynamic Young's modulus of NdNiO${}_{3}$ and Nd${}_{0.65}$Eu${}_{0.35}$NiO${}_{3}$ through the metal-insulator transition (MIT). Upon cooling, the modulus presents a narrow dip at the MIT followed by an abrupt stiffening of $\ensuremath{\sim}$$6%$. The anomaly is reproducible…
Faster and smaller computers, smarter medicaments, ultrasensitive sensors, dreams of a new generation of products that are increasingly cleaner, lighter, stronger and more efficient; those are aspects that represent the aspirations of a great part of human kind that ever more strives for better technologies. Interesti…
Epitaxial La2NiMnO6 films were grown on (100)-oriented SrTiO3 and (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates under various growth conditions by pulsed laser deposition. Ferromagnetism and transport properties of B-site-ordered perovskite are greatly influenced by growth conditions. Optimum growth conditions of…
The cooling performance of two-stage thermoelectric coolers test modules for different types (serial, parallel, and separate) are examined in this study. Thomson heat is taken into account in order to discuss its effect on temperature prediction and the internal heat transfer mechanism. Three different Seebeck coeffic…
The crystal structures, magnetic and dielectric properties were evaluated for Sm1.5Sr0.5Ni1-xMnxO4 (x = 0.03, 0.05, 0.1) ceramics. The Rietveld results of X-ray diffraction patterns confirmed single orthorhombic phase with the space group of Bmab (64) were obtained in Sm1.5Sr0.5Ni1-xMnxO4 (x = 0.03, 0.05) ceramics, wh…
This paper reports on structural, magnetic, dielectric, thermodynamic, and magnetodielectric properties of Eu${}_{1\ensuremath{-}x}$Lu${}_{x}$MnO${}_{3}$, with 0 \ensuremath{\leqslant} $x$ \ensuremath{\leqslant} 0.2, towards the ($x$, $T$) phase diagram. The phase diagram reflects the effect of lattice distortions ind…
Over the last 20 years, self-assembled nanostructures based on peptides have been investigated and presented as biomaterials with an impressive potential to be used in different bionanotechnological applications such as sensors, drug delivery systems, bioelectronics, tissue reparation, among others. Several advantages…
We investigated fluorescence from hemicyanine dye molecules in a liquid crystal (4,4′-n-pentylcyanobiphenyl) (5CB) medium at different temperatures. The fluorescence decay lifetime decreased monotonically irrespective of the thermodynamic phases of the host medium as the temperature was increased. This behavior is due…
Abstract A new interesting class of conducting polymer and copolymers based on 4‐teriary butyl‐cyclohexanone in the main chain has been synthesized by solution polycodensation of terephthalaldehyde with 4‐teriary butyl‐cyclohexanone and/or cycloalkanone derivatives. The model compound I was synthesized from the 4‐teri…