Materials Literature
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Using the layer-by-layer (LbL) assembly technique, we create a polymer-clay structure from a unique combination of LbL materials: poly(ethylene imine), Laponite clay, and poly(ethylene oxide). This trilayer LbL structure is assembled using a combination of hydrogen bonding and electrostatic interactions. The films wer…
Molecular-dynamics and Monte Carlo simulations have been used to compute the crystal-melt interface stress $(f)$ in a model Lennard-Jones (LJ) binary alloy system, as well as for elemental Si and Ni modeled by many-body Stillinger-Weber and embedded-atom-method (EAM) potentials, respectively. For the LJ alloys the int…
New macromonomers containing dialdehyde functionalities placed at the middle or at the end of the chains were synthesized in two reaction steps. First, using ring-opening polymerization (ROP) of ε-caprolactone (CL) or atom transfer radical polymerization (ATRP) of styrene (St) in the presence of proper initiators prov…
This paper studies the elastic contact in filaments induced by surface adhesion, which plays an important role in the mechanical response of fibrous materials (e.g. fibre friction, sliding, compression hysteresis, etc). During the process, a simple 3D elastic contact model was proposed. The filaments were assumed to b…
Domain walls (DWs) in strongly correlated ferroics are expected to exhibit rich physical properties due to the competition between ground states that exists in these systems. A typical example is provided by ferromagnetic mixed-valence manganites for which insulating DWs in an otherwise metallic phase have been predic…
We report the results of dielectric measurements over the frequency range10 Hz–1 MHz and the temperature range 150–300 K on polyaniline subjected to doping with dichloroacetic acid (DCA) and trichloroacetic acid (TCA) with various doping levels (6.1%, 8.2%, 13.3% and 4.1%, 6.15%, 13.5%, respectively). Conductivity is…
The disposal of wastewater, known as vinasse, from the sugarcane ( Saccharum officinarum L.) industry creates environmental problems. Agriculture can offer a potential solution to these problems by using organic residues as substitutes for chemical fertilizers. This study was conducted in Ultisol profiles from Cuba ir…
The thermal investigation of matter by use of a very localized heat source, scanning thermal microscopy (SThM), permits materials to be probed at the level of very small subsurface volumes. Therefore, the technique appears to be a promising method to study the thermal properties of thin films of submicrometric thickne…
We present a comparative study of atomic and electronic structures, Young's modulus, and optical conductivity of trigonal bulk tellurium and its nanowires of different diameters using first-principles density-functional theory calculations based on pseudopotentials and a generalized gradient approximation to exchange-…
Using first-principles density functional calculations, we have studied the magnetic ordering in pure ${\mathrm{Mn}}_{n}$ $(n=2--10,13,15,19)$ and $\mathrm{As}@{\mathrm{Mn}}_{n}$ $(n=1--10)$ clusters. Although, for both pure and doped manganese clusters, there exists many collinear and noncollinear isomers close in en…
Al-doped zinc oxide (AZO) thin films containing trace Ag nanoparticles (Ag/Zn = 0–0.15 at.%) were prepared by the sol–gel process. It was found that the doping of Ag nanoparticles resulted in the significant sintering of AZO grains and further led to the enhancement of conductivity. From the analysis of surface morpho…
Abstract The viability of the thermomechanical recycling of postconsumer milk pouches [a 50 : 50 low‐density polyethylene/linear low‐density polyethylene (LDPE–LLDPE) blend] and their use as polymeric matrices for coir‐fiber‐reinforced composites were investigated. The mechanical, thermal, morphological, and water abs…
Abstract LaF 3 :Eu 3+ (5.0 mol‐% Eu 3+ ) nanodisks with perfect crystallinity were successfully synthesized by a simple method. The synthesis was carried out in an aqueous solution at room temperature without the use of templates or organic additives. The mechanism of formation of the nanodisks was explored, and the f…
It has been proven that the maximum cooling temperature of a thermoelectric material can be increased by using either pulsed operation or graded Seebeck profiles. In this paper, we show that the maximum cooling temperature can be further increased by the pulsed operation of optimal inhomogeneous thermoelectric materia…
It has been long known that polymers can be mixed with clay minerals, however, the ideas of microcomposites have been expanded recently to a new and emerging class of clay-filled polymers, called Polymer-Clay Nanocomposites (PCN), which has experienced the real breakthrough early in the past decade only. This is a nov…
We have performed atomistic simulations of the tensile loading of and copper nanowires to investigate the coupled effects of geometry and surface orientation on their mechanical behaviour and properties. By varying the nanowire cross section from square to rectangular, nanowires with dominant surface facets are create…
Abstract Biodegradable foams derived from poly(lactic acid) (PLA) and starch were prepared by extrution using water as a blowing agent and talc as nucleation agent. Foam cellular size and size distribution was significantly affected by extrusion conditions (i.e., extruder temperature profiles, die diameters, and screw…
In this article, branched NaYF(4) nanocrystals have been successfully synthesized via a simple hydrothermal method. On the basis of the analysis of HRTEM and TEM images, the growth modes of the branched structure and further branching behavior have been proposed. The up- and down-conversion luminescence of branched Na…
Abstract A series of new nonlinear optical chromophores based on configurationally locked polyenes (CLPs) with chiral pyrrolidine donors are synthesized. All CLP derivatives exhibit high thermal stability with decomposition temperatures T d at least > 270 °C. Acentric single crystals of enantiopure D ‐ and L ‐proli…
A novel tube-shape thermoelectric module is fabricated from four ring-shaped thermoelements and its performance in electrical power generation is evaluated by measuring the power output as a function of temperature differences across the device. A theoretical model of the proposed configuration is established and empl…