Materials Literature
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Abstract The polycondensation of decafluorobenzophenone with hexafluorobisphenol A was modified by the addition of a molecular sieve dehydrating apparatus to the refluxing reaction system. This modification promoted the polymerization and enabled the reactions to be conducted in milder conditions and completed in a sh…
Abstract A novel dianhydride monomer, 3,6‐di[3′,5′‐bis(trifluoromethyl)phenyl]pyromellitic dianhydride (12FPMDA), was synthesized via a three‐step process: (1) the preparation of 3,5‐bis(trifluoromethyl)benzene boronic acid (6FBB) and 3,6‐dibromo‐1,2,4,5‐tetramethylbenzene (2B4MB) via Grignard and bromination reaction…
The X-ray diffuse scattering intensities were measured at room temperature for the Pt rich Pt–15.0 at.% Cr single crystal quenched from 800°C three-dimensionally. The atomic short-range order (ASRO) intensity component from the total diffuse ones was separated with the use of Borie–Sparks method [Acta Cryst. A 27 (197…
Samarium films capped with a thin palladium overlayer undergo a metal to semiconductor transition during in-situ hydrogen loading ( P H2 =1.01 × 10 5 Pa) at room temperature. The transition is accompanied by a change in optical appearance, i.e. metallic gray samarium films change to golden greenish transparent samariu…
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1. Introduction Gels from natural polymers have received increasing attention over the past years. They display novel physicochemical properties, particularly in aqueous systems, lending themselves valuable for a plethora of advanced applications, particularly in foods, cosmetics, medicine and biotechnology. However,…
Various oligo- and poly(ethylene glycol)s were transformed into tin-containing macrocycles by “polycondensation” with dibutyltin dimethoxide. These cyclic oligo- and poly(ethylene glycol)s were heated with a spirocycle derived from phthaloyl chloride and 1,2-dimercaptoethane. This spirocycle inserts into the Sn−O bond…
The work function of the amorphous phase of hydrogenated carbon nitride ( a -CN x :H) was calculated using Fowler–Nordheim field emission. First, metal films were deposited on conductive ZnO:Al whiskers to determine the geometric field enhancement factor at the tip of the field emitter. The radius of curvature at the…
The binding of NO to the trinuclear cluster [Ru3O(CH3CO2)6(py)2]+ (py = pyridine) leads to a stable, diamagnetic [Ru3O(CH3CO2)6(py)2(NO)]+ complex, displaying extended electronic interactions which arise from the coupling of the unpaired π* electron of NO and the unpaired electron in the π-orbitals of the Ru3O unit. T…
The structure of the iodo-substituted tetrathiafulvalene derivative EDT-TTF-I is described, with neutral molecules associated into inversion-centred dyads; no short intermolecular I···I contacts are observed. Electrocrystallisation of EDT-TTF-I (1) or EDT-TTF-I2 (2) in the presence of [nBu4N][Ni(mnt)2] afforded 2:1 sa…
Efforts to synthesize extremely large rectangle-shaped porphyrin systems have yielded an unusual and unexpected collapsed structure that brings the porphyrin walls into van der Waals contact. The bent geometry of the nominally rigid ethynylpyridyl porphyrin ligand edges, mandated by the collapse of the rectangle, impa…
To explore the potential of the coordination chemistry of Pd and Pt halides with phosphinoacetylene ligands for the generation of novel, highly metallated organometallic coordination polymers, investigations on model compounds [MX2(PPh2 C identical to CPh)2] that exhibit trans-configured Pd centers and cis-configured…
A new triacid scaffold is described based on the cone-shaped cyclotriveratrylene (CTV) molecule that facilitates the triple helical folding of peptides containing either a unique blood platelet binding collagen sequence or collagen peptides composed of Pro-Hyp-Gly repeats. The latter were synthesized by segment conden…
High Curie temperature and high Q m piezoelectric materials were developed in (0.9- x )BiScO 3 – x PbTiO 3 –0.1Pb(Mn 1/3 Nb 2/3 )O 3 (BS–PT–PMnN). A morphotrophic phase boundary (MPB), separating the rhombohedral and tetragonal phase was found at x ∼0.6, where highest piezoelectric constant ( d 33 ) and electromechani…
In order to investigate the relevance of the equilibrium crystal shape of a nickel particle during carbon nanotube growth, we have performed self-consistent pseudopotential density-functional calculations. The nickel particle's equilibrium shape is obtained from the Wulff construction using the calculated surface ener…
A polycrystal plasticity model, embedded in a finite element framework, is used to describe the Portevin–Le Chatelier effect in a velocity controlled tension test. The transition from continuous to discontinuous band propagation is captured as the applied strain rate is decreased. Statistical analysis of the stress dr…
A small library of dendrimers based on triazines was prepared by varying the surface and interior linking groups to study the relationship between structure and the ability of some of these dendrimers to gel in acidified organic solvents including chloroform, methylene chloride, and benzene. Convergent, divergent, and…
Gallium-doped zinc oxide (GZO) films were deposited at RT by dc planar magnetron sputtering under various total gas pressures ( P tot ) ranging from 0.25 Pa to 2.5 Pa using Ar as the sputtering gas and a GZO ceramic oxide target. The GZO films showed highest crystallinity at P tot = 2.0 Pa and showed clear degradation…
The adsorption behavior of 4-cyanobiphenyl (CNBP) has been investigated by means of surface-enhanced Raman scattering (SERS). CNBP appeared to assume a tilted orientation on silver and gold. The presence of the ring C−H band denoted a rather vertical orientation of the biphenyl ring on Ag and Au. On the other hand, co…
The photodissociation of Cr(CO) 6 has been studied using direct dynamics including trajectory surface hopping. The dissociation takes place on a steep excited-state potential surface leading to ejection of a CO ligand within 100 fs in reasonable agreement with time-resolved studies by Fuβ et al. 1-3 Our dynamics studi…