-
Dielectric Properties of Composite LaMnO3 Nanofiber by Electrospinning Technique
Zin Min Myat,
Than Than Win,
Yin Maung Maung,
Ko Ko Kyaw Soe
Issue:
Volume 1, Issue 3, September 2013
Pages:
65-69
Received:
12 July 2013
Published:
20 August 2013
Abstract: Electrospinning technique has been extensively developed as a simple and vasatile method for drawing nanofibers from polymer solutions. Lanthanum Maganite La1-x MnxO3 (x = 0.02 mol) nanofibers were obtained by calcinations of PVA/LaMnO3 composite at different temperatures with electrospinning utilizing sol-gel precursors. Novel polycrystalline LaMnO3 nanofibers were yielded at 500 °C, 600 °C and 700 °C for 2 h as the final products. Field Emission Scanning Electron Microscopy (FESEM) was employed to study the fiber diameter of samples. The average diameter of the LaMnO3 nanofibers was found to be in the range of 85 nm to 150 nm at different temperatures. The dielectric properties of LaMnO3 nanofibers were identified by C-f, r-f, tan - f and ac-f characteristics. The results obtained from this research will lead to enable new levels of electronic applications, biomedical applications and protective clothing.
Abstract: Electrospinning technique has been extensively developed as a simple and vasatile method for drawing nanofibers from polymer solutions. Lanthanum Maganite La1-x MnxO3 (x = 0.02 mol) nanofibers were obtained by calcinations of PVA/LaMnO3 composite at different temperatures with electrospinning utilizing sol-gel precursors. Novel polycrystalline LaMn...
Show More
-
Unknown Properties of Aluminum Nano-Layer in Unglue Assemblage of ZERODUR Parts
Issue:
Volume 1, Issue 3, September 2013
Pages:
70-73
Received:
15 July 2013
Published:
30 August 2013
Abstract: In the course of technological operations and the following running, the aluminum nanolayer providing reliable unglue bonding the ZERODUR parts demonstrates a complex of previously unknown properties: - compensation of small geometrical deviations in joined parts, due to aluminum plasticity the requirements to geometry of joined parts can be lowered from Ν = 0.5, ΔΝ = 0.1 (where Ν is the deviation of surface geometry from standard expressed in the Newton interferential rings, ΔΝ – local error or deviation of the type “well” or “nib”), which are necessary for joining, if one applies the methods of optical contact or deep optical contact, to Ν = 2-5, ΔΝ = 1; - Chemical interaction with polished ZERODUR surface at relatively low temperatures (400 to 600ºС); - Minimum level of internal mechanical strains in joined parts; - Properties of elastically-brittle durable material. Using the above generalization of the obtained results, we have offered new technological schemes for production of ZERODUR parts with a complex shape.
Abstract: In the course of technological operations and the following running, the aluminum nanolayer providing reliable unglue bonding the ZERODUR parts demonstrates a complex of previously unknown properties: - compensation of small geometrical deviations in joined parts, due to aluminum plasticity the requirements to geometry of joined parts can be lowere...
Show More
-
Effect of Nickel-Alumina Nanoparticle Catalyst on the Performance of Methane Steam Reforming Process
Aliasghar Rohani,
Laleh Allahkaram,
Ali Omidvar
Issue:
Volume 1, Issue 3, September 2013
Pages:
74-78
Received:
26 August 2013
Published:
20 September 2013
Abstract: In the present study, Fe-Mo/Al2O3 and Ni-Mo/Al2O3 catalysts were prepared using impregnation method. The structures of the catalysts were studied using XRD, BET and H2-TPR techniques. Activities of both catalysts were investigated in a fixed-bed reactor for Methane Steam Reforming (MSR) reaction. The results indicated that Ni-Mo/Al2O3 catalyst system showed better activity and hydrogen yield for MSR reaction at normal operating conditions. The stability tests of both catalysts were examined at harsh operating condition which showed Ni-Mo/Al2O3 is a fairly stable catalyst. This study introduces a new catalyst, Ni¬-Mo/Al2O3, with high activity, stability for MSR reaction. The experimental evidence suggests that the main reason for the catalyst deactivation was sintering of the nickel particles.
Abstract: In the present study, Fe-Mo/Al2O3 and Ni-Mo/Al2O3 catalysts were prepared using impregnation method. The structures of the catalysts were studied using XRD, BET and H2-TPR techniques. Activities of both catalysts were investigated in a fixed-bed reactor for Methane Steam Reforming (MSR) reaction. The results indicated that Ni-Mo/Al2O3 catalyst syst...
Show More
