Materials Literature
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A general synthetic route has been developed for the simple and efficient preparation of N-functionalized dithieno[3,2-b:2',3'-d]pyrroles. These synthetic methods utilize N-functionalized N-(3'-thienyl)-3-aminothiophenes produced from the Pd-catalyzed amination of 3-bromothiophene with primary amines, followed by a on…
Measurements of ion transport and water flux across ultrathin multilayered membranes of polyelectrolytes were carried out under nanofiltration and reverse osmosis conditions. The polyelectrolyte membranes were prepared upon alternating electrostatic layer-by-layer adsorption of polyvinylamine (PVA) and polyvinyl sulfa…
This work focuses on the synthesis method of Au nanoparticles protected by a well-defined polymer monolayer. Nanosized, spherical gold clusters coated with poly( N -isopropylacrylamide) (PNIPA) grafts were prepared by controlled radical polymerization. The polymerization of N -isopropylacrylamide was initiated from th…
Effective drug delivery requires the precise spatial and temporal delivery of therapeutic agents to the target site. To this end, a variety of chemical and physicochemical approaches have been devised to create lipid vesicles (liposomes) that can be triggered to release their contents in a controlled fashion. The trig…
A series of ten 2,3,4,5-tetraphenylsiloles with different 1,1-substituents [XYSi(CPh) 4 ] were prepared, and three of these, i.e., 1,1,2,3,4,5-hexaphenylsilole [X = Y = Ph ( 3 )], 1-ethynyl-1,2,3,4,5-pentaphenylsilole [X = Ph, Y = C⋮CH ( 15 )], and 1,1-bis(phenylethynyl)-2,3,4,5-tetraphenylsilole [X = Y = C⋮CPh ( 18 )…
Estimations of thermal hazards based on calorimetric experiments can be resource consuming. Therefore, reactive hazard predictions using computational techniques are an attractive option. Typically, prior to detailed experimentation, a screening test is performed on the set of potential reactive chemicals using a diff…
In order to reduce the compliance mismatch between the native artery and the artificial graft, we have developed a coaxial double-tubular compliant graft, using multiply micropored segmented polyurethane (SPU) thin films, which mimics the relationship between the intraluminal pressure and vessel internal diameter (P-D…
The scope of this paper is the theoretical study of hydrogen atom interaction with the boron-doped graphite surface taken as a model for the interactions that occur in controlled thermonuclear fusion devices. This work is carried out in the framework of the density functional theory. The boron-doped graphite surfaces…
The electronic structure of Pb(II) porphyrin (PbP) has been studied by performing ab initio calculations based on a density functional theory. The calculated optimum structure of PbP reasonably agrees with that determined by the X-ray structure analysis. The analysis of the Kohn−Sham orbitals of PbP has revealed that…
This paper presents an analysis of the structural changes undergone by liquid ${\mathrm{Ge}}_{15}{\mathrm{Te}}_{85}$ alloys in a 150 K temperature range above the eutectic temperature. This structural change is characterized by strong and anomalous variations of thermodynamic quantities among which are the density, th…
A low-temperature (350 °C) ion-exchange reaction was used to insert Fe−Cl layers between the perovskite blocks of a double-layered Dion−Jacobson compound. The product, (FeCl)LaNb 2 O 7, contains iron coordinated by two apical oxygens from the perovskite layer and four in-plane chlorines within the interlayer space. Ri…
The heat of reaction has been measured for vapor deposition of metal atoms onto clean polymeric substrates. These calorimetric measurements introduce a new technique for the study of metal-polymer interfacial chemistry. Results for three systems are reported here, calcium, chromium, and copper on PMDA-ODA polyimide, a…
The reinforcement of regulations concerning environment protection in most countries is a strong incentive to use “green” cross-linkers for sol−gel processes. Among them, water soluble zirconium complexes seem attractive for various applications in the surface coatings, oil production, sol stabilization, and agricultu…
The low dimensional organic conductor (BEDT-TTF)(2)Br(1.3)I(1.1)Cl(0.6) [BEDT-TTF = bis(ethylenedithio)tertathiafulvalene] is shown to be a unique molecular solid that exists in three crystalline polymorphic forms (alpha'-, alpha' "-, beta' '-phase) and, surprisingly, is able to adopt the same metal-like beta' '-phase…
The dielectric α relaxation was measured in salol over a range of temperatures at pressures as high as 0.7 GPa. The application of pressure causes a shift of the excess wing, relative to the primary α peak, indicating that the two processes have a distinct origin. Over all measured conditions, the response to pressure…
Samples of mesoporous silica SBA-15 with and without controlled framework microporosity were prepared under microwave hydrothermal conditions. These samples were evaluated for their ability to separate ethane and ethylene by obtaining their equilibrium adsorption isotherms using volumetric adsorption at 303 and 323 K,…
Hydrogen embrittlement of Ni-Ti superelastic alloy in a fluoride solution (0.2% APF) has been investigated by means of a tensile test (after immersion) and hydrogen thermal desorption analysis. Upon immersion, the tensile strength of the alloy decreased to the critical stress level of martensite transformation. Hydrog…
Exchange integrals and single-ion anisotropy parameters of a ring-shaped molecular cluster, comprising eight chromium(III) ions $(s=3/2)$ were determined by inelastic neutron scattering. Effects due to the mixing of different spin multiplets have been considered. Such effects proved to be important to correctly reprod…
In Bleaney's theory of magnetic anisotropy, the second-order crystal field coefficient, Bo2, is predicted to determine the dipolar NMR shift of paramagnetic lanthanide complexes in solution. This parameter has been measured directly, by analysing the europium emission spectra for a series of eight- and nine-coordinate…
MnAs exhibits a first-order phase transition from a ferromagnetic, high-spin metal hexagonal phase to a paramagnetic, lower-spin insulator orthorhombic phase at T(C)=313 K. Here, we report the results of neutron diffraction experiments showing that an external magnetic field, B, stabilizes the hexagonal phase above T(…