Materials Literature
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We demonstrate the electrochemical etching of gold in a solution of hydrofluoric acid and dimethylformamide (DMF) to fabricate nanoporous gold (NpAu) films. Compared to de-alloyed NpAu, the electrochemically etched NpAu exhibits controllable pore size and etching depth by adjusting the etching conditions. We propose a…
We consider a theoretical model for a binary mixture of colloidal particles and spherical emulsion droplets. The hard sphere colloids interact via additional short-ranged attraction and long-ranged repulsion. The droplet-colloid interaction is an attractive well at the droplet surface, which induces the Pickering effe…
Novel polyurethanes have been synthesized using aliphatic diisocyanate and aromatic chain extenders with varying spacer length. Nanohybrids of those polyurethanes have been prepared using two-dimensional surface modified nanoclay by dispersing it in poly-ol followed by prepolymerization and subsequent extension with c…
CONTEXT: Emex spinosa (L.) Campd. (Polygonaceae), Leptadenia pyrotechnica (Forsk.) Decne (Asclepiadaceae), Haloxylon salicornicum (Moq.) Bunge ex Bioss. (Chenopodiaceae) and Ochradenus baccatus Delile (Resedaceae) are used in folk medicine for treatment of male sexual disorders. OBJECTIVE: To investigate the effects o…
We simulated the thermoreversible micellization–demicellization process and micellar shuttle of a poly(N-isopropylacrylamide-block-ethylene-oxide) (PNIPAM–PEO) diblock copolymer in a water/ionic-liquid (1-butyl-3-methylimidazolium hexafluorophosphate, [BMIM][PF6]) system by means of dissipative particle dynamics (DPD)…
Crystallization of a Schiff base with nickel acetate in different solvents yields a tetranuclear (dicubane-like [Ni4O4] core with two missing vertices) and a hexanuclear cluster ([Ni6O6] core with two nickel(II) ions attached to a [Ni4O4] cubane through oxygen bridges). Metal centers within these clusters exhibit ferr…
Color‐tunable Ca 4‐1.5 x Ta 2 O 9 : x Tb 3+ phosphors are prepared via a convenient solid‐state reaction and the cross‐relaxation mechanism is investigated. The concentration of Tb 3+ ions greatly affects blue‐green emission in Ca 4 Ta 2 O 9 samples. The cross‐relaxation effect is explained with the use of Raman and e…
Using a combination of explicit solvent atomistic simulation and continuum theory, here we study the lateral deformation mechanics of three distinct protein structures: an amyloid fibril, a beta helix, and an alpha helix. We find that the two β-sheet rich structures - amyloid fibril and beta helix, with persistence le…
We present a combined theoretical and mass spectrometry study of the rotational isomerism of the non-classical Wells-Dawson anions. The structure is larger than the Keggin anion and six geometric isomers are predicted (α, β, γ, α*, β*, γ*) on the basis of structural arguments. This work explores the geometrical differ…
Abstract Un-doped and Mn-doped ZnO nanoparticles were successfully synthesized in an ethanolic solution by using a sol-gel method. Material properties of the samples dependence on preparation conditions and Mn concentrations were investigated while other parameters were controlled to ensure reproducibility. It was obs…
A sol-gel approach was employed to prepare nanosized YVO(4) nanopowders doped with Eu(3+) ions. Raw nanomaterials were thermally treated at 700-1000 °C for 3 h. X-ray diffraction (XRD) analysis demonstrated that single-phase nanopowders with high crystallite dispersion were obtained. Our studies were focused on relati…
Reactions of a tetravanadate anion, [V(4)O(12)](4-), with a series of lanthanide(III) salts yield three types of lanthanide complexes of macrocyclic polyoxovanadates: (Et(4)N)(6)[Ln(III)V(9)O(27)] [Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6)], (Et(4)N)(5)[(H(2)O)Ho(III)(V(4)O(12))(2)] (7), and (Et(4)N)(7)[Ln(I…
Small highly soluble probe molecules such as aniline, urea, N-methylurea, 2-bromoacetate, 1,2-propanediol, nitrous oxide, benzamidine, and phenol were soaked into crystals of various proteins to map their binding pockets and to detect hot spots of binding with respect to hydrophobic and hydrophilic properties. The sel…
We recently reported crystallographic evidence that the hydrogen bonds which can stabilize oxygen-centered negative charge within enzyme oxyanion holes are rarely found in the place they should be expected on the basis of the analysis of small-molecule crystal structures. We investigated this phenomenon using calculat…
We report a facile and scalable approach to synthesize single-walled carbon nanotubes (SWNTs) with selected diameter distribution by applying a magnetic field perpendicular to the electric field in the arc plasma region. It is found that this magnetic field-induced diameter-selectivity strategy enables the control of…
The present study revealed a surprising valence transformation of copper (Cu) in the sintering process of mixtures of copper chloride dihydrate (CuCl(2)·2H(2)O) with β-cyclodextrin (β-CD) in ambient atmosphere. Such a transformation in Cu valence states can be modulated by changing the initial molar ratio (IMR) of CuC…
Polyvinylpyrollidone (PVP)-capped platinum nanoparticles (NPs) are found to change shape from spherical to flat when deposited on mesoporous silica substrates (SBA-15). Transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and extended X-ray absorption fine structure (EXAFS) analyses are used in…
Metallisierte Gerüste: Durch Tollens-Reaktionen von Aldehyd-funktionalisierten Oligoprolingerüsten lassen sich Ag-Nanopartikeln mit einstellbarer Größe bilden. Die Partikelgröße hängt linear von der Gerüstlänge ab, und die durch Oxidation der Aldehydfunktionen im Zuge der Reaktion gebildeten Carbonsäuregruppen stabili…
Abstract Trocknende Lösungen sind nicht nur ein Modell für die Untersuchung des Verdunstungsvorgangs an sich, sondern sie lassen sich auch nutzen, um nichtflüchtige gelöste Stoffe zu komplexen geordneten Strukturen im Submikrometermaßstab und darüber zu aggregieren. Dieser Aufsatz behandelt aktuelle Fortschritte bei d…
Eine neue Klasse periodischer mesoporöser Organosiliciumoxide (PMO) mit π-Stapelanordnung der organischen Gruppen im Gerüst wurde unter Verwendung scheibenförmiger Vorstufen mit hydrophobem Perylenbisimid(PBI)-Kern aufgebaut (siehe Bild). Die PBI-verbrückten PMOs verfügen über Excitonenkopplung und bilden bei der Doti…