Materials Literature
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Novel materials based on the Ga-Sb-Te system are proposed as a medium for phase-change memory (PCM). Studied compositions were located along the pseudo-binary tie-line GaSb-Sb8Te2, in which the atomic ratio Sb/Te of GaSbTe films is higher by incorporating GaSb into Sb8Te2, indicating a possible higher crystallization…
A cycloreversion (ring-opening) process of one of the photochromic fulgide derivatives, 2-[1-(2,5-dimethyl-3-fulyl)-2-methylpropylidene]-3-isopropylidenesuccinic anhydride, was investigated by means of picosecond and femtosecond laser photolysis methods. The drastic enhancement of the reaction yield was observed by th…
Abstract Supramolecular polymers are assembled from monomeric units held together by reversible non‐covalent interactions. These supramolecular materials display polymeric properties and may soon have important industrial applications. This mini review focuses on the advances in main‐chain supramolecular polymers whos…
While hydrogels exhibit numerous characteristics that make them ideal in biological applications, they are typically limited in overall design flexibility due to the rigid dependence of their physical properties and behavior on the chemistry and cross-linking structure of the gel's network. As the demand for hydrogels…
The use of tetrahydroxy-p-benzoquinone as a slow source of dihydroxymalonato and oxalato ligands led to the isolation under open-air mild reaction conditions of five different compounds, two of them prepared for the first time: [Cu(bpy)(dhmal)]2 (1) and [{SiW12O40}{Cu2(bpy)2(H2O)(ox)}2].16H2O (5) (bpy, 2,2'-bipyridine…
Abstract A newly developed method for the preparation of free base tripyrrin ligands HTrpy by cyanide‐promoted demetalation of nickel chelates TrpyNiNCO was used in order to explore the chemistry of cadmium tripyrrins TrpyCdX with a variety of anionic co‐ligands X. The introduction of the large Cd II ion into the trip…
Four heteronuclear complexes Mn(CuL)2(SCN)2 (1), {[Mn(CuL)2(mu-dca)2].2H2O}n (2), Zn(CuL)2(SCN)2 (3), and [Fe(CuL)(N3)2]2 (4) incorporating macrocyclic oxamide ligands have been synthesized and structurally characterized. L is the dianion of diethyl 5,6,7,8,15,16-hexahydro-6,7-dioxodibenzo[1,4,8,11]-tetraazacyclotetra…
A computational (ZINDO) investigation is employed to estimate the molecular hyperpolarizability (β) of a [(TTF−NH 2 ) 8 ] (TTF = tetrathiafulvalene) octameric stack at various fractional (0 < ρ < 1) oxidation states of TTF ρ + . While the neutral [(TTF−NH 2 ) 8 ] octamer exhibits a modest (7.6 × 10 - 30 cm 5 esu - 1 )…
The interfacial properties of amphiphilic linear diblock copolymers based on poly(ethylene oxide) and poly(epsilon-caprolactone) (PEO-b-PCL) were studied at the air-water (A/W) interface by surface pressure measurements (isotherms and hysteresis experiments). The resulting Langmuir monolayers were transferred onto mic…
Holographic polymer dispersed liquid crystals (HPDLCs) are a polymer/liquid crystal (LC) composite with wavelength selective diffraction that can be switched in microseconds with electric field. As such, HPDLCs are widely applicable in optical and photonic devices. Recently, replacing acrylate polymer with thiol−ene p…
Abstract Novel amphiphilic multi‐arm star‐block copolymers with a hyperbranched core, a hydrophobic inner shell, and a hydrophilic outer shell have been prepared from a commercial hyperbranched polyester macroinitiator by ring‐opening polymerization of ε ‐caprolactone, followed by atom transfer radical polymerization…
Surface attachment of the enzyme horseradish peroxidase (HRP) was studied on untreated and ion beam implanted polystyrene (PS) films. The PS films of 100 nm thickness on a silicon wafer were treated using the plasma immersion ion implantation (PIII) technique, with argon ions of energy 20 keV and fluences of up to 2 x…
Hierarchical, high-density, ordered patterns were fabricated on Si substrates by self-assembly of CdSe nanoparticles within approximately 20-nm-thick diblock copolymer films in a controlled manner. Surface-modified CdSe nanoparticles formed well-defined structures within microphase-separated polystyrene-b-poly(2-vinyl…
The interaction of trimethoxysilane (TMS) and of 3-mercaptopropyltrimethoxysilane (MPTMS) with silica and silicon wafers has been studied by the mean of transmission FTIR spectroscopy. TMS vapor adsorption on silica's silanols results in the formation of Si-O-Si bonds at room temperature, mainly through the eliminatio…
This study is concerned with the viscoplastic behaviour of polymers. A modified viscoplastic Bodner–Partom model was extended to include successively the post-yield (strain softening and strain hardening) and the pre-yield behaviour. In order to identify material parameters of the constitutive law, an analytical schem…
Catalytic N2O decomposition has been studied over metal-substituted hexaaluminates with the general formula ABAl11O19, where A = La, Ba, and B = Mn, Fe, Ni. The materials were prepared by coprecipitation via the carbonate route followed by calcination at 1473 K for 10 h. Inductively coupled plasma optical emission spe…
This study investigates the adsorption properties of methylidyne (CH) on Rh{111}, its partial and full oxidation as well as its surface mobility, by means of plane-wave density functional theory (DFT) calculations. Besides investigating known oxidation pathways on rhodium, such as decomposition of CH and subsequent ox…
Triaquaglycinesulfatozinc(II) (ZGS), a new semiorganic nonlinear optical material with molecular formula [Zn(SO 4 )(C 2 H 5 NO 2 )(H 2 O) 3 ], has been synthesized at ambient temperature. Spectral, thermal, and optical techniques have been employed to characterize the new materials. Bulk single crystals of ZGS with a…
The electrochromic properties of dithienylethene derivates is a field of great importance and interest. In this manuscript we describe a potential molecular remote control system, which can be electrochemically triggered. Diferrocenyl compounds containing a diethylenene photoelectrochromic core with perhydro- and perf…
A multicomponent equilibrium network based on self-assembling alpha,gamma-cyclic peptides with controlled fluorescence output is described. The network takes advantage of the large association constant of alpha,gamma-cyclic peptides and the controlled formation homo- and heterodimers, making use for the first time of…