Materials Literature
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The aim of this study was to investigate and characterize different crystal forms of arteether, a rapidly acting, highly potent antimalarial drug for the treatment of acute Plasmodium falciparum malaria. Six different crystal forms were prepared utilizing various polar and non-polar solvents. Scanning electron microsc…
Cyclohexane is an extremely flexible molecule that oscillates, at room temperature, between two clearly distinct and extreme conformations that cannot be distinguished at room temperature; so much so that the NMR spectrum is a single line that includes all 12 protons be they axial or equatorial. This raises the intere…
The 1.5 Å resolution crystal structure of the Mycobacterium tuberculosis soluble inorganic pyrophosphatase Rv3628 at pH 7.0 is reported. The M. tuberculosis and M. leprae genomes include genes for the only two family I inorganic pyrophosphatases known to contain two histidines in the active site. The role of these two…
We perform Monte Carlo simulations of a simplified two-dimensional model for colloidal hard spheres in an external uniaxial ac electric field. Experimentally, the external field induces dipole moments in the colloidal particles, which in turn form chains. We therefore approximate the system as composed of well-formed…
We present an alternating current (ac) circuit based on a misoriented bilayer graphene device for analog and digital phase detection. We exploit the ambipolar nature of the transfer characteristics of a misoriented bilayer graphene transistor. The transistor action here is realized using an electrochemical gate integr…
Abstract Trinuclear silver(I) thiolate and silver(I) thiocarboxylate complexes [Ag3(μ‐dppm)3(μn‐SR)2](ClO4) [n = 2, R = C6H4Cl‐4 (1) and C{O}Ph (2); n = 3, R = tBu (3)], pentanuclear silver(I) thiolate complex [Ag5(μ‐dppm)4(μ3‐SC6H4NO2‐4)4](PF6) (4), and hexanuclear silver(I) thiolate complexes [Ag6(μ‐dppm)4(μ3‐SR)4]Y…
Exciton-polaron formation in GaGdN/AlGaN multiquantum wells was inferred from the lower energy of the photoluminescence peak observed for the GaGdN quantum wells (QWs) compared with GaN QWs. The rather low value of the excitonic transition energy is attributed to exciton-polarons bound to the Gd ions. Exciton-polarons…
Antioxidants are often added to many types of food packagings, especially packaging films, to enhance their effectiveness in protecting food from the environment. This positive action is possible due to release of the agents from the film matrix into food to reduce oxidation, thus extending the product's shelf life. F…
The properties induced by the M(4+) addition (M = Zr, Sn, Hf) in BaM(x)Ti(1-x)O(3) solid solutions have been described on the basis of a 2D Ising-like network and Monte Carlo calculations, in which BaMO(3) randomly distributed unit cells were considered as being non-ferroelectric. The polarization versus temperature d…
The local valence electronic states of the surface, interface, and substrate for SiO 2 ultrathin films thermally grown on a Si(100)-2×1 have been investigated using Si- L 23 V V Auger-electron Si n + -2 p photoelectron coincidence spectroscopy ( n represents the number of oxygen atoms bonded to the Si). A series of Si…
Abstract The trend toward the miniaturization of parts has created a strong demand for the manufacturing of precision‐molded miniature polymeric components, due to their high productivity and cost‐effectiveness. The objective of this study is the investigation of the filling behavior and dimensional accuracy of thin m…
Abstract The reaction of AgNO3 and sulfobenzoate with neutral ligands led to the formation of three complexes, {[Ag2(4‐sb)(Ph3P)2(3‐apy)]·(H2O)}n (1), {[Ag(PPh3)(2‐apy)]·[Ag(PPh3)(3‐sb)]·(H2O)}n (2) and [Ag(PPh3)(Hdpa)(4‐Hsb)] (3) (4‐H2sb = 4‐sulfobenzoic acid, PPh3 = triphenylphosphine, 3‐apy = 3‐aminopyridine, 2‐apy…
Designs of high-voltage (HV) systems for creating a drift electric field in liquid argon TPCs are reviewed. In ongoing experiments systems capable of approx. 100 kV are realised for a drift field of 0.5-1 kV/cm over a length of up to 1.5 m. Two of them having different approaches are presented: (1) the ICARUS-T600 det…
This is a fullerene-based low toxic nanocationite designed for targeted delivery of the paramagnetic stable isotope of magnesium to the doxorubicin (DXR)-induced damaged heart muscle providing a prominent effect close to about 80% recovery of the tissue hypoxia symptoms in less than 24 hrs after a single injection (0.…
We report de Haas–van Alphen (dHvA) effect measurement of the intermediate-valence compound CeCoSi 3 whose crystal structure lacks space-inversion symmetry. Some dHvA frequencies of CeCoSi 3 qualitatively correspond to those of CeRhSi 3 which is a heavy-fermion antiferromagnet exhibiting pressure-induced superconducti…
Fluctuation technique is used to measure hot-phonon lifetime in dual channel GaN-based configuration proposed to support high-power operation at high frequencies. The channel is formed of a composite Al0.1Ga0.9N/GaN structure situated in an Al0.82In0.18N/AlN/Al0.1Ga0.9N/GaN heterostructure. According to capacitance–vo…
Crystalline copper nanoparticles (NPs) were formed in silica by multi-energy MeV ion implantations and then transformed to amorphous NPs by irradiation with 5 MeV Sn3+ ions. Optical absorption spectra of both the phases were evaluated in the ultra-violet to near-infrared regions. Compared with corresponding crystallin…
We show that a thin film of a three-dimensional topological insulator (3DTI) with an exchange field is a realization of the famous Haldane model for quantum Hall effect (QHE) without Landau levels. The exchange field plays the role of staggered fluxes on the honeycomb lattice, and the hybridization gap of the surface…
We have calculated the plasmon frequency of the two-dimensional electron gas (2DEG) in AlGaN/GaN high electron mobility transistors (HEMT). The impact of HEMT's parameters on the plasmon frequency and the sheet charge density of the 2DEG is discussed in detail. The charge density in the HEMT's channel is calculated by…
In situ and ex situ surface plasmon resonance (SPR) studies on swift heavy ion (SHI) irradiated silver–silica nanocomposite (NC) films are reported. The size of the ion tracks under dense electronic excitation density induced by mega-electronvolt (MeV) and giga-electronvolt (GeV) ions irradiation is determined. The re…