Differential geometry of surfaces and Heisenberg ferromagnets
The relation between differential geometry of surfaces and some Heisenberg ferromagnet models is considered.
Materials Literature
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A Simple and Efficient Route to N-Functionalized Dithieno[3,2-b:2‘,3‘-d]pyrroles: Fused-Ring Building Blocks for New Conjugated Polymeric Systems
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…
Use of Polyelectrolyte Layer-by-Layer Assemblies as Nanofiltration and Reverse Osmosis Membranes
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…
Synthesis of Gold Nanoparticles Grafted with a Thermoresponsive Polymer by Surface-Induced Reversible-Addition-Fragmentation Chain-Transfer Polymerization
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…
Chemical Approaches to Triggerable Lipid Vesicles for Drug and Gene Delivery
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…
Synthesis, Light Emission, Nanoaggregation, and Restricted Intramolecular Rotation of 1,1-Substituted 2,3,4,5-Tetraphenylsiloles
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 )…
Application of Transition State Theory for Thermal Stability Prediction
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…
Coaxial double‐tubular compliant arterial graft prosthesis: Time‐dependent morphogenesis and compliance changes after implantation
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…
Density functional theory investigation of H adsorption on the basal plane of boron-doped graphite
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…
Theoretical Study of Metal−Ligand Bonds in Pb(II) Porphyrins
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…
Experimental investigation of the waterlike density anomaly in the liquidGe15Te85eutectic alloy
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…
Insertion of a Two-Dimensional Iron-Chloride Network between Perovskite Blocks. Synthesis and Characterization of the Layered Oxyhalide, (FeCl)LaNb 2 O 7
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…
Calorimetry of Polymer Metallization: Copper, Calcium, and Chromium on PMDA-ODA Polyimide
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…
Aqueous Zirconium Complexes for Gelling Polymers. A Combined X-ray Absorption Spectroscopy and Quantum Mechanical Study
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…
Multistability in a BEDT-TTF Based Molecular Conductor
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…
Dynamics of Salol at Elevated Pressure
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…
Potential Adsorbent for Light Hydrocarbon Separation: Role of SBA-15 Framework Porosity
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 fluoride solution
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…
Microscopic spin Hamiltonian of aCr8antiferromagnetic ring from inelastic neutron scattering
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…
Correlation of optical and NMR spectral information with coordination variation for axially symmetric macrocyclic Eu(iii) and Yb(iii) complexes: axial donor polarisability determines ligand field and cation donor preference
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…