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  • 1
    Electronic Resource
    Electronic Resource
    On the Mechanical Properties of Transversely Isotropic Material Using the Nanoindentation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 987-992 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Anodic alumina has exhibits a homogeneous morphology of parallel pores that can beeasily controlled between 10 and 400 nm. AAO(Anodic Aluminum Oxide) structure is thetransversely isotropic material due to the parallel pores. In this study, mechanical properties of theAAO structures are measured using the nano-indentation method. Nano-indentation technique is oneof the most effective methods to measure mechanical properties of nano-structures. Investigation ofmechanical properties, such as the indentation modulus and hardness of the AAO structure withvarying nano-pore sizes, was performed using the nano-indentation method. The results showed thatthe indentation modulus and hardness decreases monotically as the pore size increases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.987.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Young’s Modulus of Nanohoneycomb Structures According to the Porosity (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 761-764 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Young’s modulus of nanohoneycomb structures in the vertical direction relative to thepore (generally along the beam length) is measured according to the porosity from bending tests inatomic force microscopy (AFM). The pore diameters of the nanohoneycomb structures are fromabout 30 to 60 nm. To determine the Young’s modulus of the nanohoneycomb structures, the areamoment of inertia of the nanohoneycomb structure is determined according to the arrangement of thepores. The area moment of inertia of the nanohoneycomb structure is found to be affected by theporosity of the nanohoneycomb structures. The Young’s modulus of the nanohoneycomb structuresdecreases as a function of the porosity in a large range
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.761.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Superhydrophobic Micro- and Nanostructures Based on Polymer Sticking (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 897-900 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Superhydrophobic polytetrafluoroethylene (Teflon®, DuPont) sub-micro andnanostructures were fabricated by the dipping method, based on anodization process in oxalic acid.The polymer sticking phenomenon during the replication creates the sub-microstructures on thenegative polytetrafluoroethylene nanostructure replica. This process gives a hierarchical structurewith nanostructures on sub-microstructures, which looks like the same structures as lotus leaf andenables commercialization. The diameter and the height of the replicated nano pillars were 40 nm and40 um respectively. The aspect ratio is approximately 1000. The fabricated surface has asemi-permanent superhydrophobicity, the apparent contact angle of the polytetrafluoroethylenesub-micro and nanostructures is about 160 °, and the sliding angle is less than 1°
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.897.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Transient one-dimensional heat flow technique applied to porous reactive medium (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3079-3080 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A transient one-dimensional heat flow technique was presented to measure the effective thermal conductivity of porous reactive media. The porous reactive medium was in contact with a flat thermistor in a cell, and vacuum was applied to remove the air and the moisture. Afterwards, ammonia atmosphere was maintained in the cell under a fixed temperature and pressure. A varistor with max. 100 Ω was used to equate with the resistance of the thermistor corresponding to the fixed temperature. The temperature increase of thermistor was 2–3 °C, which was sufficient to avoid the enthalpy effect due to chemical reaction. A graphite-CaCl2⋅nNH3 complex was given as a test specimen for the porous reactive medium. Measurements showed that the thermal conductivity of graphite-CaCl2⋅8NH3 complex has distinctively higher values than the graphite-CaCl2⋅4NH3 and CaCl2⋅2NH3 complex. The accuracy of measured conductivity was estimated to be within 10%. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149060
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  • 5
    Electronic Resource
    Electronic Resource
    Template-based carbon nanotubes and their application to a field emitter (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2052-2054 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Anodic aluminum oxide (AAO) templates were fabricated by anodizing Al films. After the Co catalyst had been electrochemically deposited into the bottom of the AAO template, carbon nanotubes (CNTs) were grown by the catalytic pyrolysis of C2H2 at 650 °C. Overgrowth of CNTs on the AAO templates was observed. The diameter of the CNTs strongly depends on the size of the pores in the AAO template. The electron field emission measurements on the samples showed a turn-on field of 1.9–2.1 V/μm and a field enhancement factor of 3360–5200. Our observation concerning the low turn-on field and high field enhancement factors is explained in terms of a low field screening effect. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1359483
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of silica glass using solventless sol-gel process (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 907-912 
    Details
    ISSN: 1573-4846
    Keywords: sonogel ; aerogel ; synthesis ; silica glass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica glass was synthesized form TEOS and deionized water using sol-gel process. To introduce the physicochemical effects of ultrasonic waves, an ultrasonic homogenizer was used to mix reactants instead of adding cosolvents. 2-step method was chosen to separate hydrolysis reaction and condensation reaction, and thus to control the microstructure of wet gels. Wet gels were dried in 5–8 hours without cracks using supercritical drying with ethanol at 300°C and 10.34 MPa. Aerogels thus obtained have hydrophobic surfaces due to the reesterification reactions during supercritical drying. Aerogels were sintered in a tube furnace in the changing atmosphere from N2 through O2 to He. Sudden volume change was started at 1050°C and sintering was completed at 1100°C as expected. Large pores of aerogels allowed fast sintering in 16 and a half hours. Incomplete extraction in supercritical drying step produced crystals during sintering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486374
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  • 7
    Electronic Resource
    Electronic Resource
    Manufacture of biodegradable packaging foams from agar by freeze-drying (1997)
    Springer
    Journal of materials science 32 (1997), S. 5825-5832 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cellular foams were made from the aqueous solution of agar by freeze-drying. A narrow range (5–20°C min-1) of freezing rate was required to avoid damage to the microstructure of the agar foams. The size of cells in the foam decreased with increasing freezing rate. Agar foams of more than 4 wt% agar content absorbed more energy than a polystyrene foam in compression tests. Foams with a higher agar content absorbed more energy. The behaviour of agar foams in compression tests could be explained by the modified beam theory for cellular foams. Agar foams were thermally stable up to 200°C, and were also stable in a humid environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018642406530
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal plasma chemical vapour deposition for SiC powders from SiCH3Cl3-H2 (1991)
    Springer
    Journal of materials science 26 (1991), S. 5957-5964 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ultrafine β-SiC powders were synthesized by introducing trichloromethylsilane and hydrogen into the high temperature RF thermal plasma argon gas. Powders were characterized by XRD, TEM, TGA, FT-IR and wet chemical analysis. Two different positions of reactant gas injection, i.e., upstream and downstream of the plasma flame, were compared in terms of the powder characteristics. The optimum concentration of hydrogen was found out to be about 3 to 4 mol % for the upstream injection. Amorphous SiC with free carbon was formed when the hydrogen concentration was lower than optimum and β-SiC with free silicon was formed when it was higher than the optimum. For the downstream injection, free silicon formation was not significant and free carbon formation was suppressed when the hydrogen concentration was higher than 7 mol %. Chemical reaction pathways were suggested which could explain these observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01130141
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  • 9
    Electronic Resource
    Electronic Resource
    Gas-phase synthesis of AlN powders from AlCl3-NH3-N2 (1993)
    Springer
    Journal of materials science 28 (1993), S. 57-64 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Aluminium nitride powders were synthesized by the gas-phase reaction of AlCl3-NH3-N2 system. The yield of AlN powders from AlCl3 and their crystallinity increased as the reaction temperature and the mole ratio of NH3/AlCl3 were increased. AlN powders were also formed outside the reactor and their crystallinity was amorphous. The yield of AlN powders was as high as 80% when the reactor temperature was 1000 °C and the mole ratio of NH3/AlCl3 was 8. Most of the HCl by-product was recovered as NH4Cl outside the reactor. Powder characteristics, such as shape, size distribution and crystallinity, were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349033
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