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。
A series of pyrene-based polycyclic aromatic compounds, indeno[cd]pyrene, diindeno[cd,fg]pyrene, diindeno[cd,jk]pyrene, tris-(tert-butylindeno[cd,fg,jk])pyrene, and tetrakis-(tert-butylindeno[cd,fg,jk,mn])pyrene, were reduced with alkali metals in [D8]tetrahydrofuran, and the resulting anions were studied by NMR spect…
Unlike the majority of molecular systems quantum dots can accommodate multiple excitations, which is a particularly important attribute for potential lasing applications. We demonstrate in this work the concept of using nth order nonlinear spectroscopies in the transient grating configuration as a means of selectively…
A new microporous borogermanate NH4[BGe3O8] has been synthesized by a molten boric acid flux method with "reagent" quantities of water in which GeO2, ethylenediamine, H2O, and H3BO3 (5:8:14:25) were heated together at 513 K for 4 days. The structure consists of {Ge6O18}n chains, further linked together via BO4 tetrahe…
Phase-change emulsions (PCE) are important in a variety of applications, from ultrasound imaging to the explosive material used in the mining industry, but until now there has been no adequate theory to describe their activation properties. The PCE consists of a low-boiling-point liquid, known as the volatile phase, d…
We have investigated the structural, electrical and mechanical properties of multi-walled carbon nanotube (MWNT)?polyethylene oxide (PEO) composites. Composites with different wt% (between 0 and 50?wt% of MWNTs) were prepared and characterized by the scanning electron microscopic technique. Enhanced electrical conduct…
Abstract Reaction of CuX 2 (X = Cl, Br) with pyridine alcohol ligands [2‐(hydroxymethyl)pyridine = Hhmp, 2‐(hydroxyethyl)pyridine = Hhep and 2‐(hydroxypropyl)pyridine = Hhpp] affords a series of new Cu II alkoxide complexes with a similar Cu 2 O 2 structural motif: a dinuclear complex, [Cu 2 (hpp) 2 Br 2 ] ( 1 ), two…
[Structure: see text] Reaction of 4-hydroxyisophthalaldehyde with excess phenyl magnesium bromide gave a dicarbinol and this condensed with pyrrole and aromatic aldehydes in the presence of BF3.Et2O to afford, following oxidation with DDQ, novel tetraarylcarbaporphyrinoids in 10-24% yield. Further reaction with silver…
An ab initio calculation on the pristine and silicon-doped (5,5) boron nitride nanotube was performed. It was found that the silicon substitution for either a single boron or a single nitrogen atom in the (5,5) BN nanotube can induce spontaneous magnetization, and the local symmetry of the system is broken by the sili…
We measure the liquid content, the bubble speeds, and the distribution of bubble sizes, in a vertical column of aqueous foam maintained in steady state by continuous bubbling of gas into a surfactant solution. Nearly round bubbles accumulate at the solution/foam interface, and subsequently rise with constant speed. Up…
Self-assembly processes and subsequent photo-cross-linking were used to generate cross-linked, ordered microporous structures on the surfaces of well defined four-arm star-shaped poly(D,L-lactide) (PDLLA) thin films. The four-arm star-shaped PDLLAs were synthesized using an ethoxylated pentaerythritol initiator. Solut…
We have studied the growth dynamics of ultrasmooth hydrogenated amorphous carbon films deposited on silicon substrates by electron cyclotron resonance chemical vapor deposition from argon/methane gas mixtures applying a high negative external bias. The surface morphology of films deposited for different growth times u…
Density functional theory and classical molecular dynamics simulations are used to investigate the prospect of lithium-doped corannulene as adsorbent material for H(2) gas. Potential energy surface scans at the level of B3LYP/6-311G(d,p) show an enhanced interaction of molecular hydrogen with lithium-atom-doped corann…
Electron bombardment from a filament as well as voltage pulses from a scanning tunnelling microscope tip have been employed to modify the surface of TiO 2 (110). Individual H atoms are selectively desorbed with electrical pulses of +3 V from the scanning tunnelling microscope tip, whilst leaving the oxygen vacancies i…
Very different materials are named ‘Glass’, with Young's modulus E and Poisson's ratio ν extending from 5 to 180 GPa and from 0.1 to 0.4, respectively, in the case of bulk inorganic glasses. Glasses have in common the lack of long range order in the atomic organization. Beside the essential role of elastic properties…
This review article focuses on the structures and properties of novel hybrid nanocarbon materials, which are created by incorporating atoms and molecules into the hollow spaces of carbon nanotubes (CNTs); thus they are called nanopeapods. After dealing with synthesis procedures, we discuss the structures and electroni…
PPh(2)-functionalized SBA-15 was synthesized by co-condensation of tetraethyl orthosilicate and 2-(diphenylphosphino)ethyltriethoxysilane through prehydrolysis. The as-prepared PPh(2)-SBA-15 was used as the support to immobilize the Ru(II) organometallic catalyst through the strong coordination between the Ru(II) and…
We study proton diffusion in amorphous SiO2 from the atomic scale to the long-range percolative regime. Ab initio molecular dynamics suggest that the dominant atomic process consists in cross-ring interoxygen hopping assisted by network vibrations. A statistical analysis accounting for the disorder in amorphous SiO2 y…
Recently, an unusual integer quantum Hall effect was observed in graphene in which the Hall conductivity is quantized as ${\ensuremath{\sigma}}_{xy}=(\ifmmode\pm\else\textpm\fi{}2,\ifmmode\pm\else\textpm\fi{}6,\ifmmode\pm\else\textpm\fi{}10,\dots{})\ifmmode\times\else\texttimes\fi{}{e}^{2}∕h$, where $e$ is the electro…
A method of calculating the number and nature of rigid unit modes (RUMs) in linearly bridged framework structures is presented. Using this approach, it is shown that linearly bridged framework structures inherently possess large degrees of structural flexibility, irrespective of their connectivity (i.e., framework top…
The local spin-density functional approximation is increasingly being used for materials applications such as predicting structural and magnetic properties. The recently aquired ability to model low-lying magnetic excitations like magnons is used for deriving useful formulae to estimate the Curie (Neel) temperatures o…