Materials Literature
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Smectites, clay minerals commonly found in soils and sediments, vary widely in their ability to adsorb organic chemicals. Recent research has demonstrated the importance of surface charge density and properties of exchangeable cations in controlling the affinity of smectites for organic molecules. In this study, we in…
Abstract The effects of various additional non‐nitrile‐containing monomers on the heat resistance of thermoplastic expandable microspheres containing acrylonitrile and methacrylonitrile were investigated to determine the correlation between the chemical structure and expandable properties. Thermoplastic expandable mic…
Modern piezoelectric transducers normally have complicated structures and work under severe loading conditions. Due to their inherent domain‐switching processes, the real response of piezoceramics under large‐signal loading is dominated by a significantly non‐linear behavior that is to be considered in reliability ass…
In this study, we synthesized a series of the organic/inorganic hybrid star PCLs. These star PCLs can form inclusion complexes (ICs) with α- and γ-CD, but not with β-CD. These CD ICs were characterized by XRD, solid-state 13 C CP/MAS NMR spectroscopy, 1 H NMR spectroscopy, FT-IR spectroscopy, DSC, and TGA. Our results…
A novel approach to tailor the degree of branching of poly(ether ester)s was developed based on the copolymerization of oligomeric A 2 and B 3 monomers. A dilute solution of poly(ethylene glycol) (PEG) (A 2 ) was added slowly to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B 3 ) at room temperature in th…
The effect of geometrical frustration in a two-dimensional $1∕4$-filled strongly correlated electron system is studied theoretically, motivated by layered organic molecular crystals. An extended Hubbard model on the square lattice is considered, with competing nearest-neighbor Coulomb interaction $V$, and that of next…
The effect of adding various kinds of acids HX (X = Cl, Br, I, CF(3)COO, CF(3)SO(3), TFPB ((3,5-(CF(3))(2)C(6)H(3))(4)B) to isomeric tetra(2-pyridyl)porphyrin, tetra(3-pyridyl)porphyrin, and tetra(4-pyridyl)porphyrin (TpyP(2), TpyP(3), and TpyP(4)) in dichloromethane solution has been investigated through the combined…
Something to fret about: Luminescent semiconductor nanocrystals are covered with polymeric ligands which form many bonds to the nanocrystal (NC) and increase their solubility. The ligands are decorated with an organic dye molecule (see picture) so that the electronic interaction in individual nanocrystal–dye complexes…
Abstract Cyclodextrins are cyclic oligosaccharides. Cyclodextrin molecules can form inclusion complexes with a large number of organic molecules. The properties of cyclodextrins enable them to be used in a variety of different textile applications. Cyclodextrins can act as auxiliaries in washing and dyeing processes,…
We report the preparation of nanosized silicon nitride (Si 3 N 4 ) ceramics via high‐energy mechanical milling and subsequent spark plasma sintering. A starting powder mixture consisting of ultrafine β‐Si 3 N 4 and sintering additives of 5‐mol% Y 2 O 3 and 2‐mol% Al 2 O 3 was prepared by high‐energy mechanical milling…
The changes in the morphology of Ba-oxide-based NO x storage/reduction catalysts were investigated using time-resolved X-ray diffraction, transmission electron microscopy, and energy dispersed spectroscopy. Large Ba(NO 3 ) 2 crystallites form on the alumina support when the catalyst is prepared by the incipient wetnes…
1st and 2nd heterogeneous deacetylations of alpha- and beta-chitins in a multistep process by means of freeze-pump out-thaw (FPT) cycles in the presence of 50% (w/v) NaOH, for temperatures ranging from 80 to 110 degrees C, were compared to the classical method using argon as the medium atmosphere. It was clearly demon…
Metal Al particle surfaces were modified by fine γ‐Al 2 O 3 grains using a mixture of Al and Al(OH) 3 powders, which was pressureless sintered at a temperature of 600°C in vacuum. All the constituents on original Al particle surfaces were transformed into γ‐Al 2 O 3 phase after sintering. No dense passive oxide layers…
We report the synthesis of hyperbranched glycopolymers by self-condensing vinyl copolymerization (SCVCP) of the methacrylic AB* inimer 2-(2-bromoisobutyryloxy)ethyl methacrylate (BIEM) with 3- O -methacryloyl-1,2:5,6-di- O -isopropylidene-α- d -glucofuranose (MAIGlc) via atom transfer radical polymerization, followed…
We describe the syntheses and characterization of a series of periodic mesoporous organosilica (PMO) materials containing various organic functional groups prepared using the direct synthesis method under basic conditions. This synthetic method allows the production of mesoporous organosilicas that have large surface…
Abstract Starch–poly(vinyl alcohol) (PVA) blends with different compositions were prepared and crosslinked with borax by in situ and posttreatment methods. Various amounts of glycerol and poly(ethylene glycol) with a molecular weight of 400 were added to the formulations as plasticizers. The pure starch–PVA blends and…
Abstract Starch was crosslinked with poly(vinyl alcohol) (PVA) by boric acid. A suitable plasticizer and defoamer were added to obtain the brei. A film from the starch and PVA (SP film) was prepared by casting. The effects of various factors, such as the crosslinking temperature, the PVA content, and the amounts of gl…
We have found a method for a diameter-selective removal of metallic single-walled carbon nanotubes (m-SWCNTs) from semiconducting (s-) ones by stirring or sonicating SWCNT powder in tetramethylene sulfone (TMS)/chloroform solution with nitronium hexafluoroantimonate (NO2SbF6: NHFA) and nitronium tetrafluoroborate (NO2…
Abstract Summary: This communication describes the compatibilization efficiency of organically modified montmorillonite (OMMT) in immiscible polycarbonate (PC)/poly(methyl methacrylate) (PMMA) blends for the first time. The size of the dispersed PC particles was reduced significantly upon the addition of OMMT (6 wt.‐%…
The method of ultrasound irradiation is used for anchoring metallic nanocrystals (Ag, Au, Pd, and Pt) onto the surface of polystyrene spheres. In former studies, almost all the sonochemically prepared, coated metallic nanomaterials were formed as amorphous nanoparticles (Pol, V. G.; et al. Langmuir 2002, 18, 3352; Pol…