英语论文写作的好句型

科技英语写作
Start sentences of Introduction
(1)Since the first report claiming the hydrothermalsynthesis of titania nanotubes, there have been intense researches on the growth and structure of this kind of peculiar nanotubes owing to their potential photocatalytic applications.
(2) Carbon nanotubes, which were found by Iijima et al.,have great potential as materials with novel properties that are not found in conventional graphite or carbon fullerene.
(3)Much research has been conducted on developing nanotubes with novel properties by controlling the nanostructure.
(4) Environmental and supply problems related to the use of fossil fuels have stimulated the search for alternative sources of energy.
(5) Dimensionality has a profound effect on the behavior of solids.
(6) Nanotubular titanium(IV) oxide materials, produced by alkaline hydrothermal treatment, are recently introduced1 but intensively studied materials,which are characterized by a nanosized diameter and unique physicochemical properties.
(7)The knowledge of long term stability in various environments is extremely important for practical applications of titanate nanotubes.
(8) Since carbon nanotube has been discovered, much attention to the synthesis of various nanotubes and nanowires in nanotechnology is observed.
(9) Nanostructured materials obtained by the intercalation of porphyrins and metalloporphyrins into two-dimensional matrices have been investigated with the purpose of exploring the photoprocesses and catalytic reactions involved.
(10) We will report here the first successful synthesis of photoresponsive multilayer spiral nanotubes by the introduction of polyfluorinate cationic azobenzene derivative.
Abstact
(1) Thermodynamic and kinetic aspects of the acid transformation are discussed.
(2) The rate of conversion of nanotubes to nanoparticles has been related to the concentration of soluble titanium in solution, which depends on the nature of the acid.
(3) In this paper, the synthesis of tubular titania was carried out through a soft chemical hydrothermal reaction of TiO2 powders in NaOH or KOH aqueous solution systems.
(4) It was found that nanotubular products prepared in our studies were identified as H2Ti4O9•H2O
(5) The photocatalytic activity of nanotubular H2Ti4O9•H2O was evaluated in a decomposition test
(6) The morphology and yield of these nanotubular products were found to be dependent on the hydrothermal synthetic conditions.
(7) TiO2 nanotubes are a novel and intensively class studied of structurally organized, nanosized materials.
(8) Nanotubes having an internal diameter in the range 2.5-5 nm have very similar optical properties, in contrast to the expected behavior for quasi-1-D systems.
(9) The rate of intercalate formation is limited by the diffusion of molecular hydrogen inside the multilayered walls of the TiO2 nanotube.
(10) This is explained by the complete thermal smearing of all 1-D effects, due to the large effective mass of charge carriers in TiO2, resulting in an apparent 2-D behavior of TiO2 nanotubes.
Introduction
(1) The dimension of the tubes is controlled by the pore size of the mold prepared using porous materials such as alumina, it is not easy to obtain nanotubes with smaller diameters.
(2) Polyfluorinated organic compounds are a unique class of organic compounds and have been the subject of recent research activity.
(3)Their very weak intermolecular interactions with other molecules can be exploited for various applications.
(4)We have recently found that the ammonium cation-type polyfluorinated surfactants are easily intercalated into the clay interlayer spaces of sodium saponite to form rigidly packed bilayer structures.
(5)because they have great potential for such applications as environmental purification, decomposition of carbonic acid gas, and generation of hydrogen gas.
(6)The successful application of titanate nanotubes requires data on the range of operational conditions under which nanotubes are stable.
(7)The interlayer space in the nanotubes was fixed and close to the original spacing in the K4Nb6O17 crystals.
(8) In this work, the stability of multilayered wall titanate nanotubes in the presence of 0.1 mol dm-3 bases and acids, at room temperature, was studied over a period of several months.
(9) The correlation between the transformation of nanotubes to nanoparticles and the concentration of soluble titanium in solution has also been considered.
(10) Especially,titania based nanotubes and nanowires are one of most promising nanotubes for applications as photocatalysts.
Experimental
(1) The surface morphology of the MV2+-K4Nb6O17 hybrid shows the sheets layer-by-layer restacking.
(2) The layered compound, K4Nb6O17

[ 本帖最后由 ykgoals 于 2008-4-15 14:27 编辑 ]