Materials Literature
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Femtosecond two-pulse degenerate four-wave mixing spectroscopy was applied to study the exciton dephasing in a broad range of excitation intensities and lattice temperatures. We find that both exciton-exciton and exciton-phonon scattering have profound effects on the dephasing process. The dominant phonon mode involve…
In Mycobacterium tuberculosis, the genes hsaD (2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoic acid hydrolase) and nat (arylamine N-acetyltransferase) are essential for survival inside of host macrophages. These genes act as an operon and have been suggested to be involved in cholesterol metabolism. However, the role of NAT…
We explored experimentally and theoretically the optical properties of isolated silver trimer-dipeptide bioconjugates. The metallic moiety induces a strong enhancement of the optical absorption of the peptide. We also show that its binding to a peptide can reduce the conformational flexibility and induce transitions b…
We discuss the influence of electric fields on spin waves in simple ferromagnets produced by the flexoelectric interaction. Such terms produce a frequency shift that is linear in both the applied electric field and the wave vector of the spin waves. Above a certain critical electrical field, ferromagnetism is unstable…
By using Monte Carlo simulations, we study the complex phase behavior of charged-stabilized colloidal particles in a two-dimensional substrate potential with quasicrystalline decagonal symmetry. In the regime where the strengths of the substrate and colloidal pair potential are comparable, we identify a novel and unex…
We have studied the structural rearrangements in a lamellae-forming poly(styrene-b-butadiene) film during exposure to toluene vapor. Real-time, in situ grazing-incidence small-angle X-ray scattering allowed us to identify distinct kinetic regimes: First, the lamellae swell linearly, and the blocks stretch uniaxially.…
Abstract Cotton fabric was coated with chitosan (CS) and polyethylene glycol (PEG) followed by freeze‐drying. The influence of PEG on the physical characteristics and the surface morphology was investigated. The scanning electron microscopy of the coated fabric revealed a porous structure. The porosity of the material…
Mussel byssal threads are functionally graded biological fibers adapted for tethering the soft tissue of the organism (∼1 MPa) to hard surfaces !(25 GPa) in the rocky seashore. A stiffness gradient mitigates contact deformation and is defined by an incrementally regulated distribution of two protein block copolymer va…
Hierarchical polyaniline nanostructures with branched nanofibers as scaffolds are prepared by a solution method using ferric chloride oxidant without using any organic structure directing reagent or hard template. The synthesis parameters, such as reaction temperature and time, on the morphologies and crystal structur…
Poly(amidoamine)s with amino pendant groups were prepared by hydrogen-transfer polyaddition of primary and secondary amines to bis-acrylamines. Dansyl cadaverine (DC) doxorubicin (Dox) were bound to the polymers via a cis-aconityl spacer to give conjugates containing 3 microg of DC per mg of polymer and 28 to 35 micro…
Abstract The electronic transport properties of stacks of perylene‐bis(dicarboximide) (PDI) chromophores, covalently fixed to the side arms of rigid, helical polyisocyanopeptides, are studied using thin‐film transistors. In device architectures where the transistor channel lengths are somewhat greater than the average…
Abstract Dense and porous hyperbranched carbosiloxane thin films (HBCSO) are obtained by sol–gel processing using methylene‐bridged hyperbranched polycarbosilanes (HBPCSs) with the general compositional formula {(OMe) 2 Si(CH 2 )}. Introduction of porosity is achieved using a porogen templating approach, allowing the…
Abstract The effect of nanoplatelets on the rheological behavior of epoxy monomers with variations in nanoplatelet exfoliation level and aspect ratio was investigated. The results show that the presence of exfoliated nanoplatelets in epoxy can significantly influence viscosity and lead to shear‐thinning phenomena, esp…
Highly uniform and large-area single-walled carbon-nanotube (SWNT) networks are realized by the dip-coating method, which is based on fundamental fluid-dynamic phenomena such as capillary condensation and surface tension. The changes in the polarity and hydration properties of the substrate affect the morphology of th…
We report rates of Auger recombination (AR) in zero-dimensional (0D) PbSe nanocrystals as a function of energy gap (Eg) by using applied hydrostatic pressure to controllably shift E(g) according to the bulk deformation potential. Our studies reveal that the rate of AR in nanocrystals is insensitive to energy gap, whic…
A series of diarylethenes and their disulfonyl derivatives such as 1,2-bis(2-heptyl-1-benzothiophene-3-yl)perfluorocyclopentene (HBTF6), 1,2-bis(6-acetyl-2-heptyl-1-benzothiophene-3-yl)perfluorocyclopentene (DAHBTF6), 1,2-bis(2-heptyl-1-benzothiophene-1,1-dioxide-3-yl)perfluorocyclopentene (HBTFO4), and 1,2-bis(6-acet…
A model is presented for magnetoelectric (ME) effects in a functionally graded ferroelectric-ferromagnetic bilayer. A linear grading of the piezoelectric coefficient and permittivity in the ferroelectric and a similar grading of piezomagnetic coefficient in the ferromagnet are assumed. The ME coupling at low frequenci…
Porous high surface area thin films of nanosheet-shaped monoclinic MoO(3) were deposited onto platinized Si substrates using patch antenna-based atmospheric microplasma processing. The films were characterized by high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and electroch…
Abstract Sb‐doped SnP 2 O 7 were prepared and characterised with XRD, FTIR, SEM and EIS. The preparation parameters were optimised taking into consideration the influence of H 3 PO 4 content in the reactants and P m O n impurities. Conductivities of SnP 2 O 7 with different Sb doping levels were studied from 100 to 30…
Hitherto, direct structural characterization of polycrystalline product phases obtained in solid state polymerization reactions has been limited by the lack of appropriate experimental techniques for structure determination. This paper demonstrates the opportunity to apply modern powder X-ray diffraction techniques fo…