Materials Literature
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A new AB 2 monomer, 2,3-bis(3-amino-4-hydroxyphenyl)quinoxaline-6-carboxylic acid dihydrochloride, was synthesized in four steps starting from the double condensation of commercially available 3,4-diaminobenzoic acid and 4,4‘-dimethoxybenzil. It underwent facile polycondensation in polyphosphoric acid to afford the co…
Abstract The synthesis, X‐ray crystal structure and magnetic properties of two oxalato‐bridged dinuclear Cu II complexes, [L‐Cu(μ‐ox)Cu‐L](ClO 4 ) 2 , where ox = oxalate and L = 1,4,7‐trimethyl‐1,4,7‐triazacyclononane (Me 3 tacn) or 1‐benzyl‐4,7‐dimethyl‐1,4,7‐triazacyclononane (BzMe 2 tacn) are reported, as well as t…
Crystalline vanadium pentoxide with hierarchical mesopores was synthesized by using a CTAB/BMIC cotemplate (CTAB = cetyltrimethylammonium bromide, BMIC = 1-butyl-3-methylimidazolium chloride). The material was fully characterized by SEM, TEM, N2 adsorption-desorption, XRD, XPS, and CV methods. By elaborate adjustment…
Abstract The crystallization, melting behavior, and morphology of Polypropylene (PP) and PP/Novolac blends were studied by scanning electron microscopy, wide angle X‐ray diffraction, differential scanning calorimetry, and polarized optical microscope. The results showed that the crystallization of PP in PP/Novolac ble…
Towards the prediction of thermodynamic properties for complex systems and the design of self-assembly techniques for the production of nanocomposite materials, we employ Monte Carlo simulations to calculate the effective interactions between colloidal brushes dissolved in nonadsorbing polymer solutions. For simplicit…
Different chemical reaction models (first-order, second-order, and n th-order) and six different model-fitting techniques ( n th-order, Friedman, Freeman−Carroll, Chang, ASTM E689, and the standard deviation minimization technique (SDMT)) are used to evaluate the kinetics triplet ( E, ln k 0, and n ) for the thermal d…
Abstract The low vapor pressure solvent 1‐chloropentane was used to directly spincast polystyrene (PS) films onto poly(methyl methacrylate) (PMMA) with smooth surfaces and sharp interfaces. Interface roughness after removal of the PS layer with cyclohexane was determined with scanning force microscopy to be <1 nm.…
Ultrahigh-molecular-weight polyethylene film was continuously manufactured from reactor powder by calendar rolling under controlled processing conditions. Subsequent tensile drawing above the melting temperature gave a maximum draw ratio of 10 at 150 °C. The resultant tensile modulus and strength reached maximum value…
A synthetic strategy for the construction of chiral salen ligands bearing two rigid xanthene spacers functionalized with carboxylic acid and ester groups is presented. Suzuki cross-coupling methodology is used to furnish the appropriately functionalized xanthene spacers to a salicylaldehyde, which is subsequently cond…
Small-to-medium-angle neutron diffraction as well as a full neutron polarization study of CMR manganites of general formula La0.7Pb0.3(Mn1?xFex)O3, from x = 0 up to x = 0.2, reveal the presence of nanometre-sized magnetic domains having characteristic dimensions about one order of magnitude smaller than the crystal gr…
A series of pyrene-based polycyclic aromatic compounds, indeno[cd]pyrene, diindeno[cd,fg]pyrene, diindeno[cd,jk]pyrene, tris-(tert-butylindeno[cd,fg,jk])pyrene, and tetrakis-(tert-butylindeno[cd,fg,jk,mn])pyrene, were reduced with alkali metals in [D8]tetrahydrofuran, and the resulting anions were studied by NMR spect…
Unlike the majority of molecular systems quantum dots can accommodate multiple excitations, which is a particularly important attribute for potential lasing applications. We demonstrate in this work the concept of using nth order nonlinear spectroscopies in the transient grating configuration as a means of selectively…
A new microporous borogermanate NH4[BGe3O8] has been synthesized by a molten boric acid flux method with "reagent" quantities of water in which GeO2, ethylenediamine, H2O, and H3BO3 (5:8:14:25) were heated together at 513 K for 4 days. The structure consists of {Ge6O18}n chains, further linked together via BO4 tetrahe…
Phase-change emulsions (PCE) are important in a variety of applications, from ultrasound imaging to the explosive material used in the mining industry, but until now there has been no adequate theory to describe their activation properties. The PCE consists of a low-boiling-point liquid, known as the volatile phase, d…
We have investigated the structural, electrical and mechanical properties of multi-walled carbon nanotube (MWNT)?polyethylene oxide (PEO) composites. Composites with different wt% (between 0 and 50?wt% of MWNTs) were prepared and characterized by the scanning electron microscopic technique. Enhanced electrical conduct…
Abstract Reaction of CuX 2 (X = Cl, Br) with pyridine alcohol ligands [2‐(hydroxymethyl)pyridine = Hhmp, 2‐(hydroxyethyl)pyridine = Hhep and 2‐(hydroxypropyl)pyridine = Hhpp] affords a series of new Cu II alkoxide complexes with a similar Cu 2 O 2 structural motif: a dinuclear complex, [Cu 2 (hpp) 2 Br 2 ] ( 1 ), two…
[Structure: see text] Reaction of 4-hydroxyisophthalaldehyde with excess phenyl magnesium bromide gave a dicarbinol and this condensed with pyrrole and aromatic aldehydes in the presence of BF3.Et2O to afford, following oxidation with DDQ, novel tetraarylcarbaporphyrinoids in 10-24% yield. Further reaction with silver…
An ab initio calculation on the pristine and silicon-doped (5,5) boron nitride nanotube was performed. It was found that the silicon substitution for either a single boron or a single nitrogen atom in the (5,5) BN nanotube can induce spontaneous magnetization, and the local symmetry of the system is broken by the sili…
We measure the liquid content, the bubble speeds, and the distribution of bubble sizes, in a vertical column of aqueous foam maintained in steady state by continuous bubbling of gas into a surfactant solution. Nearly round bubbles accumulate at the solution/foam interface, and subsequently rise with constant speed. Up…
Self-assembly processes and subsequent photo-cross-linking were used to generate cross-linked, ordered microporous structures on the surfaces of well defined four-arm star-shaped poly(D,L-lactide) (PDLLA) thin films. The four-arm star-shaped PDLLAs were synthesized using an ethoxylated pentaerythritol initiator. Solut…