Materials Literature
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High temperature plateau thermal conductivity (kmin) remains poorly understood despite its crucial importance in thermal insulation components at elevated temperature. We report In/Sc doped La2Zr2O7 pyrochlores with rattlers and oxygen vacancies and their effects on heat transport. Rattlers can dramatically flatten k-…
We have systematically investigated thermoelectric properties of layered Bi2Sr2−xCaxCo2Oy (0.0≤x≤2.0) by a series of Ca doping. The resistivity presents a metal-insulator transition for lightly doped samples, while such behavior is not observed for heavily doped samples. Amazingly, the Ca doping induces an exotic rein…
Abstract This paper presents a process for CO2 foam generation in the presence of nanosilica particles as supercritical CO2 and nanosilica dispersion flow through a sandstone core at reservoir conditions of 20°C and 1,200 psig. The generation of CO2 foam was observed in an online sapphire tube. Pressure drop across th…
The friction anisotropy of human hair has been investigated as a function of angle using AFM fiber probe measurements to evaluate the role of cuticle alignment. It is found that friction hysteresis, the difference in friction coefficients between sliding with or against the cuticle direction, is essentially nonexisten…
Numerical modeling of aftertreatment systems has been proven to reduce development time as well as to facilitate understanding of the internal physical and chemical processes occurring during different operating conditions. Such a numerical model for a catalyzed diesel particulate filter (CPF) was developed in this re…
Directed self-assembly of cylinder forming block copolymer (c-BCP) thin films via a dynamic thermal field on multidimensional symmetric graphoepitaxy channels is reported. A synergy of dynamic thermal and static boundary fields induces highly aligned c-BCP cylinders inside the channels with a power law dependence of o…
Epitaxial PbZr0.52Ti0.48O3 (PZT 52/48) heterostructures incorporating SrRuO3 electrodes were patterned through a single step epitaxial lift-off technique without using any acidic etching. This procedure enables patterning of high temperature grown perovskite multilayers through the use of a pre-patterned AlOx mask whi…
The comparison of the performances of SiO2 and SiOC layers as host matrices for optically active Eu ions is presented. A SiO2 matrix allows to observe light emission from both Eu2+ and Eu3+ ions, owing to a proper tuning of the thermal annealing process used for the optical activation of the rare earth. However, the p…
The interaction of ferrocene with tin(IV) o-benzosemiquinonato complexes in acetonitrile results in a reversible electron transfer (ET) from ferrocene to the redox-active ligand with the formation of electron-transfer complexes [(3,6-Cat)SnBr3](-)[Cp2Fe](+) (1) and [(3,6-Cat)(3,6-SQ)SnCl2](-)[Cp2Fe](+) (2), where 3,6-…
Detailed soot deposition and oxidation characteristics in a diesel particulate filter (DPF) have been experimentally examined on a unique bench-scale DPF test system that has a visualization window. The filtration and regeneration processes were visualized to examine soot deposition and oxidation behaviors on the filt…
Multilayer graphene systems with a rhombohedral stacking order harbor nearly flat bands in their single-particle spectrum. We propose ansatz states to describe the surface-localized states of flat band electrons. The absence of kinetic dispersion near the Fermi level leaves the interaction as a dominate mechanism to g…
We compare the simulated fuel economy and emissions for both conventional and hybrid class 8 heavy-duty diesel trucks operating over multiple urban and highway driving cycles. Both light and heavy freight loads were considered, and all simulations included full aftertreatment for NOx and particulate emissions controls…
In this study, sodium alginate (SA) and xanthan (XG), selected as two typical pastes, were intensively investigated by steady, transient, and dynamic rheological methods. Compared with SA, in the steady-shear tests it was found that XG showed a prominent shear-thinning feature at low shear rates and low concentrations…
Using formic acid as a cosolvent and saturated sodium sulfate as a coagulation bath, soy protein/poly(vinyl alcohol) (PVA) blend fibers were prepared using wet-spinning approaches. The structure and mechanical, thermal, and water-uptake properties of the spun fibers were investigated. Morphological analysis with polar…
Gadolinium (Gd) chelate contrast-enhanced magnetic resonance imaging (MRI) is a preferred method of glioma detection and preoperative localisation because it offers high spatial resolution and non-invasive deep tissue penetration. Gd-based contrast agents, such as Gd-diethyltriaminepentaacetic acid (DTPA-Gd, Magnevist…
Blue and green luminescence spectra of Tb3+ ions in lead phosphate glasses were examined under UV excitation. The green-to-blue luminescence intensity ratio G/B is considerably reduced with decreasing Tb3+ concentration. Thus, blue emission lines are enhanced in comparison to the main 5D4-7F5 green transition of Tb3+.…
Abstract Inorganic scale (carbonate, sulphate and sulphides) formation can be predicted from thermodynamic models and over recent years better kinetic data has improved the prediction of such scales in field conditions. However these models have not been able to predict the observed deposition where flow disturbances…
Understanding the interrelation between surface chemistry of colloidal particles and surface adsorption of biomolecules is a crucial prerequisite for the design of materials for biotechnological and nanomedical applications. Here, we elucidate how tailoring the surface chemistry of colloidal alumina particles (d50 = 1…
Magnetostriction (MS) caused by the global magnetization of limbs and yokes and magnetic forces are the undisputed causes of the vibration and noise in power transformer cores. This paper presents a novel way to reduce the vibration and noise, in which nanocrystalline soft magnetic composite (NSMC) material with high…
Microbial biofabrication is emerging as eco-friendly, simpler, and reproducible alternative to chemical synthesis of metals and semiconductor nanoparticles, allowing generation of rare geometrical forms such as nanotriangles and nanoprisms. Highly confined nanostructures like triangles/prisms are interesting class of…