17 research outputs found
Synthesis of Zinc Ferrites in RF Thermal Plasma Reactor
Formation of nanosized zinc ferrite spinels was studied
from iron- and zinc oxide powders and corresponding
nitrate solutions, respectively in a radiofrequency thermal
plasma reactor. From the viewpoint of applications,
the research was motivated by the potential use of these
materials in advanced magnetic devices on the one
hand, and by their biomedical applications such as drug
carriers or agents for cancer treatment by hyperthermia
on the other. In this work effects of synthesis conditions
on properties of products were studied in details. The
products were characterised for chemical composition,
phase conditions, particle size distribution, morphologies
and saturation magnetisation. Most products exhibited
ferrimagnetic behaviour. Correlations among domain-
and particle sizes were also investigated. Conditions
for the synthesis of nanosized, inverse zinc ferrites
of high saturation magnetisation were established. It
was proved that in thermal plasma conditions normal
and inverse ferrites could be produced in a single step
process
Synthesis of Spinel Ferrites in Radiofrequency Thermal Plasma Reactor
Formation of nanosized zinc-ferrites and nickel-zinc ferrites from iron- and
zinc oxide powders and corresponding nitrate solutions, respectively, was studied in RF
thermal plasma conditions. The products were characterized for chemical composition,
phase conditions, particle size distribution, morphologies and saturation magnetization.
Effects of synthesis conditions on properties of products were studied in details
The pyrolysis of methyl ricinoleate and methyl ricinelaidate studies on the preparation of methyl undecylenate
A ricinolsav- Ă©s ricinelaidinsav-metilĂ©szter hĆbontĂĄsĂĄrĂłl : vizsgĂĄlatok az undecilĂ©nsav-metilĂ©szter elĆĂĄllĂtĂĄsĂĄra II.
A versatile characterization of poly(N-isopropylacrylamideco- N,N'-methylene-bis-acrylamide) hydrogels for composition, mechanical strength, and rheology
Poly(N-isopropylacrylamide-co-N,N"-methylene-bisacrylamide) (P(NIPAAm-co-MBA)) hydrogels were prepared
in water using redox initiator. The copolymer composition at high conversion (> 95%) was determined indirectly by
HPLC (high performance liquid chromatography) analysis of the leaching water and directly by solid state 13C CP MAS
NMR (cross polarization magic angle spinning nuclear magnetic resonance) spectroscopy of the dried gels, and was found to be close to that of the feed. The effect of cross-linker (MBA) content in the copolymer was investigated in the concentration range of 1.1â9.1 mol% (R:90â10; R = mol NIPAAm/mol MBA) on the rheological behaviour and mechanical strength of the hydrogels. Both storage and loss modulus decreased with decreasing cross-linker content as revealed by dynamic rheometry. Gels R70 and R90 with very low cross-linker content (1.2â1.5 mol% MBA) have a very loose network structure, which is significantly different from those with higher cross-linker content manifesting in higher difference in storage modulus. The temperature dependence of the damping factor served the most accurate determination of the volume phase transition temperature, which was not affected by the cross-link density in the investigated range of MBA concentration.
Gel R10 with highest cross-linker content (9.1 mol% MBA) behaves anomalously due to heterogeneity and the hindered
conformation of the side chains of PNIPAAm
Magyar TanĂtĂłkĂ©pzĆ 39 (1926) 2-3
Magyar TanĂtĂłkĂ©pzĆ
A TanĂtĂłkĂ©pzĆ-intĂ©zeti TanĂĄrok OrszĂĄgos EgyesĂŒletĂ©nek közlönye
39. Ă©vfolyam, 2-3. szĂĄm
Budapest, 1926. ĂĄprili
Magyar TanĂtĂłkĂ©pzĆ 37 (1922) 4-8
Magyar TanĂtĂłkĂ©pzĆ
A TanĂtĂłkĂ©pzĆ-intĂ©zeti TanĂĄrok OrszĂĄgos EgyesĂŒletĂ©nek közlönye
37. Ă©vfolyam, 4-8. szĂĄm
Budapest, 1922. jĂșniu
Magyar TanĂtĂłkĂ©pzĆ 27 (1912) 04
Magyar TanĂtĂłkĂ©pzĆ
A TanĂtĂłkĂ©pzĆ-intĂ©zeti TanĂĄrok OrszĂĄgos EgyesĂŒletĂ©nek közlönye
27. Ă©vfolyam, Negyedik fĂŒzet
Budapest, 1912. ĂĄprilis h
Magyar TanĂtĂłkĂ©pzĆ 10 (1895) 09
Magyar TanĂtĂłkĂ©pzĆ
A TanĂtĂłkĂ©pzĆ-intĂ©zeti TanĂĄrok OrszĂĄgos EgyesĂŒletĂ©nek közlönye
10. Ă©vfolyam, 09. fĂŒzet
Budapest, 1895. november h