Materials Literature
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Two-dimensional (2D) honeycomb systems made of elements with d electrons are rare. Here, we report the fabrication of a transition metal (TM) 2D layer, namely, hafnium crystalline layers on Ir(111). Experimental characterization reveals that the Hf layer has its own honeycomb lattice, morphologically identical to grap…
The inhibition effect of synthesized 2,4-bis(phenyl)-1 H -benzodiazepine (BPBD) and 2,4-bis(methoxyphenyl)-1 H -benzodiazepine (BMBD) on corrosion of N80 steel in 15% HCl solution was investigated using weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. The e…
Structural, magnetic, and magnetocaloric properties of Mn2-xCrxSb compounds have been studied. In these compounds, a first order magnetic phase transition from the ferrimagnetic to the antiferromagnetic state occurs with decreasing temperature, giving rise to giant inverse magnetocaloric effects that can be tuned over…
We present temporal evolution of the spin Seebeck effect in a YIG|Pt bilayer system. Our findings reveal that this effect is a sub-microseconds fast phenomenon governed by the temperature gradient and the thermal magnons diffusion in the magnetic materials. A comparison of experimental results with the thermal-driven…
We focused on elastic properties of B- and N-doped graphene in a wide range of concentrations up to 20%. The Young’s, bulk, and shear moduli and Poisson’s ratio have been calculated by means of density functional theory for a representative set of supercells with disordered impurity patterns including aggregates. In c…
We investigate the transport of electrons in disordered and pristine graphene devices. Fano shot noise, a standard metric to assess the mechanism for electronic transport in mesoscopic devices, has been shown to produce almost the same magnitude ($\ensuremath{\approx}1/3$) in ballistic and diffusive graphene devices a…
We report piezo-response force microscopy studies of the static and dynamic properties of domain walls (DWs) in 11 to 36 nm thick films of crystalline ferroelectric poly(vinylidene-fluoride-trifluorethylene). The DW roughness exponent {\zeta} ranges from 0.39 to 0.48 and the DW creep exponent {\mu} varies from 0.20 to…
Renormalization of quasiparticles and excitons in carbon nanotubes (CNTs) near a metallic surface has been studied within a many-body formalism using an embedding approach newly implemented in the GW and Bethe-Salpeter methods. The quasiparticle band-gap renormalization in semiconducting CNTs is found to scale as $\en…
Using first principles density functional calculations, we study the electronic structure of the low-dimensional multiferroic compound FeTe${}_{2}$O${}_{5}$Br to investigate the origin of the magnetoelectric (ME) effect and the role of Te ions in this system. We find that without magnetism, even in the presence of Te…
$W$-band (\ensuremath{\nu} \ensuremath{\cong} 94 GHz) electron paramagnetic resonance (EPR) spectroscopy was used for a single-crystal study of a star-shaped Fe${}_{3}$Cr single-molecule magnet (SMM) with crystallographically imposed trigonal symmetry. The high resolution and sensitivity accessible with $W$-band EPR a…
A new method is developed to extend the histogram method to lattices with any type of disorder. The Monte Carlo single- and multiple-histogram methods were developed to get the most out of only a few simulations, but are restricted to simulations with identical lattice configurations. The method introduced here expand…
The potential applications of nanomaterials as drug delivery systems and in other products continue to expand. Upon introduction into physiological environments and driven by energetics, nanomaterials readily associate proteins forming a protein corona (PC) on their surface. This PC influences the nanomaterial's surfa…
The surface chemistry of materials has an interactive influence on cell behavior. The optimal adhesion of mammalian cells is critical in determining the cell viability and proliferation on substrate surfaces. Because of the inherent high hydrophobicity of a poly(dimethylsiloxane) (PDMS) surface, cell culture on these…
Colloidal particles with directional interactions are key in the realization of new colloidal materials with possibly unconventional phase behaviors. Here we exploit DNA self-assembly to produce bulk quantities of "DNA stars" with three or four sticky terminals, mimicking molecules with controlled limited valence. Sol…
Size-controlled soft-template synthesis of carbon nanodots (CNDs) as novel photoactive materials is reported. The size of the CNDs can be controlled by regulating the amount of an emulsifier. As the size increases, the CNDs exhibit blue-shifted photoluminescence (PL) or so-called an inverse PL shift. Using time-correl…
We use micro-Raman and photoluminescence (PL) spectroscopy at 300 K to investigate the influence of uniaxial tensile strain on the vibrational and optoelectronic properties of monolayer and bilayer MoS${}_{2}$ on a flexible substrate. The initially degenerate ${E}^{\ensuremath{'}}$ monolayer Raman mode is split into a…
Bacterial spot caused by Xanthomonas perforans is a major disease of tomatoes, leading to reduction in production by 10-50%. While copper (Cu)-based bactericides have been used for disease management, most of the X. perforans strains isolated from tomatoes in Florida and other locations worldwide are Cu-resistant. We…
Trabajo presentado a la 25th European Conference on Biomaterials, celebrada en Madrid del 8 al 11 de septiembre de 2013.
Sowohl die katalytische Methanol- als auch Ammoniaksynthese spielen in der chemischen Industrie eine große Rolle. Beide Chemikalien werden als Plattformmolekül in Größenordnungen von mehreren Millionen Tonnen jährlich hergestellt. Beide Moleküle werden zurzeit aufgrund ihres vorteilhaften C zu H Verhältnisses sowie ei…
The selective conversion of alcohols to their carbonyl derivatives is a critical step towards a sustainable chemical industry. Heterogeneous Pd catalysts represent some of the most active systems known, even so further studies into the active species and role of support are required. Through controlling support mesost…