Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Novel bis(arylamine-substituted) oligo(ladder-type pentaphenylene)s 1-3, with bridge lengths estimated to be 2.2, 4.2, and 6.3 nm, respectively, have been developed, and the model compound 4 with a mono-arylamine substituent was also synthesized. Their absorption spectra in different solvents are almost identical, whi…
Aluminium nitride (AlN) one-dimensional (1D) nanostructures, including crystalline nanowires, faceted nanotubes and conventional single-walled nanotubes, were investigated by means of density functional theory (DFT) using the generalized gradient approximation (GGA). While the larger diameter crystalline nanowires are…
BACKGROUND: Superparamagnetic nanoparticles are currently used as contrast agents for magnetic resonance imaging. These particles can also be used as drug carriers for local chemotherapy, called magnetic drug targeting. Using an external magnetic field, colloidal nanoparticles can be directed to a specific body compar…
Colloidal homobranched ZnSe nanowires (NWs) and heterobranched CdSe-ZnSe NWs are successfully synthesized by combining a sequential seeding strategy with the solution-liquid-solid (SLS) growth process. We have developed an efficient approach to deposit secondary bismuth nanoparticles onto the NW backbone to induce the…
We propose a model describing liquid-solid phase coexistence in mixed lipid membranes by including explicitly the occurrence of a rippled phase. For a single component membrane, we employ a previous model in which the membrane thickness is used as an order parameter. As function of temperature, this model properly acc…
Toroidal carbon nanotubes can serve as hosts for encapsulated loops of atomic metal wires. Such composite structures have been analyzed using density functional theory for a semiconducting ${\mathrm{C}}_{120}$ torus encapsulating chains of Fe, Au, and Cu atoms. The sheathed metal necklaces form a zigzag structure and…
We have calculated the binding energy of various nucleobases (guanine (G), adenine (A), thymine (T) and cytosine (C)) with (5,5) single-walled carbon nanotubes (SWNTs) using ab-initio Hartre-Fock method (HF) together with force field calculations. The gas phase binding energies follow the sequence G $>$ A $>$ T $>$ C.…
Current R&D activities on materials for fusion power reactors are mainly focused on plasma facing, structural and tritium breeding materials for plasma facing (first wall, divertor) and breeding blanket components. Most of these activities are being performed in Europe, Japan, the People's Republic of China, Russia an…
Single-nanotube photometry was used to measure the product of absorption cross section and fluorescence quantum yield for 12 (n,m) structural species of semiconducting single-walled carbon nanotubes in aqueous SDBS suspension. These products ranged from 1.7 to 4.5 x 10(-19) cm(2)/C atom, generally increasing with opti…
C60-C8H8 and C70-C8H8 are prototypes of rotor-stator cocrystals. We present infrared and Raman spectra of these materials and show how the rotor-stator nature is reflected in their vibrational properties. We measured the vibrational spectra of the polymer phases poly(C60C8H8) and poly(C70C8H8) resulting from a solid s…
A multicomponent [2]rotaxane designed to operate as a molecular shuttle driven by light energy has been constructed, and its properties have been investigated. The system is composed of (1) a light-fueled power station, capable of using the photon energy to create a charge-separated state, and (2) a mechanical switch,…
We report the results of a $^{63,65}$Cu NMR/NQR study probing the intermetallic compound PrCu$_2$. The previously claimed onset of magnetic order at 65 K, indicated in a $μ$SR study, is not confirmed. Based on our data we discuss different possible reasons for this apparent discrepancy, including a non negligible infl…
A simple and accurate method of calculating phonon spectra in mixed semiconductors alloys, on the basis of preliminarily (from first principles) relaxed atomic structure, is proposed and tested for (Zn,Be)Se and (Ga,In)As solid solutions. The method uses an observation that the interatomic force constants, calculated…
We review studies on spin-dependent tunneling phenomena in systems containing ferromagnetic nanoparticles. We discuss preparation methods of assembling nanoparticles as well as the mechanisms and results of spin-dependent transport properties. The emphasis of this review is on characteristic spin-dependent tunneling p…
Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics, Kamba, S., Nuzhnyy, D., Vaněk, P., Savinov, M., Knížek, K., Shen, Z., Šantavá, E., Maca, K., Sadowski, M., Petzelt, J.
The 1−2 nm SiQDs can photocatalyze CO 2 reduction and dye (methyl red) degradation, while 3−4 nm SiQDs can photocatalyze selective oxidation of benzene to phenol, owing to tunable band gap and excellent photoconductive properties of SiQDs.
Using ammonia and Co(CH 3 COO) 2 ·4H 2 O as starting materials, a facile and surfactant-free route to controlled synthesis of Co 3 O 4 nanoparticles was proposed. Co 3 O 4 nanoparticles with average sizes of 3.5, 6, 11, 19 and 70 nm were obtained through adjusting the ethanol amount in the solvent (the ratio of ethano…
High sensitivity photodetectors are of great significance in developing a new generation of optoelectronic devices in sensing, imaging, and other applications. In this Communication, highly sensitive UV detectors based on ZnO nanobelts (NBs) are achieved by polymer surface-functionalization. The UV-induced photoconduc…
Hexagonal boron nitride (hBN) and aluminum oxinitride (AlON) composites were synthesized by combustion reaction of powder mixtures of Al–B 2 O 3 –AlN systems under a low pressure of nitrogen gas (0.5 MPa). Explosive combustion reaction of Al–B 2 O 3 systems under the same nitrogen pressure produced alumina, aluminum b…
Catalytic graphitisation of carbon was used to explain the synthesis of carbon nanotubes from acetylene using the catalytic chemical vapour deposition method. This was achieved by comparing the kinetics of synthesis of carbon nanotubes at varying acetylene concentrations and different operating temperature ranging fro…