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Search for "Al2O3" in Full Text gives 158 result(s) in Beilstein Journal of Nanotechnology.
Catalytic activity of nanostructured Au: Scale effects versus bimetallic/bifunctional effects in low-temperature CO oxidation on nanoporous Au
Beilstein J. Nanotechnol. 2013, 4, 111–128, doi:10.3762/bjnano.4.13
- reaction temperature of 30 °C, without applying any pretreatment prior to the measurements. The catalysts were diluted with α-Al2O3 in order to obtain differential reaction conditions, with reactant conversions of below 15% throughout the measurements. The temperature of the catalyst bed was measured by a
Influence of the diameter of single-walled carbon nanotube bundles on the optoelectronic performance of dry-deposited thin films
Beilstein J. Nanotechnol. 2012, 3, 692–702, doi:10.3762/bjnano.3.79
- produced by vaporization from a resistively heated iron wire (current 2.7 A, diameter 250 μm, purity 99.95%, Goodfellow, USA) in a H2/Ar (7/93 mol ratio) flow of 480 cm3·min−1 inside an aluminium oxide (Al2O3) tube (inner diameter 16 mm). Particles formed and grew through vapor nucleation–condensation and
- coagulation processes inside an Al2O3 tube reactor (inner diameter 22 mm) and were mixed with 500 cm3·min−1 CO, together with 1300 ppm of CO2, in the heated section of the furnace. The mixing zone resided 29 cm from the bottom inlet of the reactor, corresponding to wall temperatures of 460–700 °C. The aerosol
Synthesis and electrical characterization of intrinsic and in situ doped Si nanowires using a novel precursor
Beilstein J. Nanotechnol. 2012, 3, 564–569, doi:10.3762/bjnano.3.65
- precursor gas flow was stopped, and the quartz tube was purged with He for a further 5 min before the sample was removed from the APCVD system. For contacting the NWs, 200 × 200 µm2 Au pads were structured on a highly doped Si (100) wafer, capped with 80 nm Al2O3, by photolithography and lift-off techniques
Surface functionalization of aluminosilicate nanotubes with organic molecules
Beilstein J. Nanotechnol. 2012, 3, 82–100, doi:10.3762/bjnano.3.10
- [Al2O3·SiO2·2H2O] [22]. The schematic representation of imogolite is shown in Figure 1. The gas adsorption data of N2, CO2, and CH4 concluded that imogolite possesses an inner-pore diameter of 1 nm [23]. The wall structure of imogolite comprises a layer of gibbsite on the outer wall, and a layer of
Self-assembled monolayers and titanium dioxide: From surface patterning to potential applications
Beilstein J. Nanotechnol. 2011, 2, 845–861, doi:10.3762/bjnano.2.94
- often observed both in the liquid phase and in the gas phase, suggesting, albeit not proving [11][12] the need for adsorption as a prerequisite for photocatalysis. Self-assembled monolayers (SAMs) being chemisorbed in an ordered manner on surfaces such as metals (Au, Ag), oxides (SiO2, Al2O3, TiO2) and
- groups/nm2 for H3Si(CH2)8SiH3. Unlike organosilane SAMs, whose tendency to form on TiO2 and SiO2 is quite similar, SAMs having phosphonic acid as their connecting head group are not formed on silicon dioxide but are formed easily from aqueous solutions on TiO2, Al2O3, Ta2O5 and Nb2O5 [27]. FTIR
- deposition of boehmite (AlOOH·nH2O) on the exposed TiO2 domains. Then, a heat-treatment step converted the boehmite into Al2O3, while oxidizing the SAMs, forming a patterned TiO2–boehmite surface. A hydrophobic SAM was then attached to both types of domains, which then went through a second step of exposure
Detection of interaction between biomineralising proteins and calcium carbonate microcrystals
Beilstein J. Nanotechnol. 2011, 2, 222–227, doi:10.3762/bjnano.2.26
- -ray measurement. The specific surface area of the microcrystals was determined by the BET gas adsorption method (see, e.g., [4]) with N2 as adsorptive at a temperature of 77 K (BELsorp-miniII). Preparation of proteins Shells of Haliotis laevigata were sand blasted (Sigg Strahlmittel, WA 70, with Al2O3
Magnetic interactions between nanoparticles
Beilstein J. Nanotechnol. 2010, 1, 182–190, doi:10.3762/bjnano.1.22
- after grinding for different periods of time together with nanoparticles of η-Al2O3 [45]. At room temperature, the spectrum of the as-prepared sample shows a sextet with very broad lines, typical for samples in which the superparamagnetic relaxation is suppressed by inter-particle interactions. At 80 K
- nanoparticles, Phys. Rev. B 2000, 62, 1124. Copyright (2000) by the American Physical Society. Mössbauer spectra of 8 nm hematite nanoparticles ground in a mortar with η-Al2O3 nanoparticles for the indicated periods of time. (a) Spectra obtained at room temperature. (b) Spectra obtained at 80 K. Reprinted with
Flash laser annealing for controlling size and shape of magnetic alloy nanoparticles
Beilstein J. Nanotechnol. 2010, 1, 55–59, doi:10.3762/bjnano.1.7
- pulsed laser beam, without changing the NPs composition. These developments open up a new way to design magnetic alloys NPs with ideal morphologies and size for magnetic studies and applications. Results and Discussion CoPt NP thin films on amorphous alumina (a-Al2O3) were produced by pulsed laser
- deposition (PLD) in a high vacuum chamber [21][22]. a-Al2O3 and the metals are deposited by PLD using a KrF excimer laser at 248 nm with a pulse duration of 25 ns at a repetition rate of 5 Hz. Substrates were commercial transmission electron microscopy (TEM) grids on which an amorphous carbon layer with a
- thickness of 10 nm was deposited. On the top of the amorphous carbon, a 3 nm layer of a-Al2O3 was deposited. Then, cobalt and platinum were alternatively deposited using pure Co and Pt targets irradiated with an energy density of 4.4 J/cm2 in order to obtain Co50Pt50 NPs. The crystalline structure of as
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