Dynamic Faraday magneto-optical properties of the water-based Fe3O4 magnetic fluids

2010 ◽  
Author(s):  
Du Lin ◽  
Wang Shibin ◽  
Lin Sen
Keyword(s):  
Optical Properties ◽  
Magnetic Fluids ◽  
Water Based

scholarly journals UV-A Treatment of ZrO2 Thin Films Fabricated by Environmental Friendlier Water-Based Solution Processing: Structural and Optical Studies

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 821
Author(s):  
Aneeqa Bashir ◽  
Mehwish Farooq ◽  
Abdul Malik ◽  
Shahzad Naseem ◽  
Arshad Saleem Bhatti
Keyword(s):  
Optical Properties ◽  
Low Cost ◽  
Annealed Film ◽  
Optical Transmittance ◽  
Amorphous Structure ◽  
Solution Processing ◽  
Vis Spectroscopy ◽  
Water Based ◽  
Free Films ◽  
Quartz Substrates

An environmentally friendlier solution processing has been introduced to fabricate zirconium oxide (ZrO2) films on quartz substrates, using spin coating of simple water-based solution. The films cured with UV-A = 330 nm for different times (40, 80, 120 min) were investigated for structural and optical properties and compared with thermally annealed film (at 350 °C). XRD and Raman spectroscopy showed amorphous structure in all the samples with no significant phase transformation with UV-A exposure. AFM microscopy showed smooth and crack free films with surface roughness ≤2 nm that reduced with UV-A exposure. Ultraviolet-visible (UV–Vis) spectroscopy demonstrated optical transmittance ≥88% and energy band gap variations as 4.52–4.70 eV. Optical constants were found from spectroscopic ellipsometry (SE). The refractive index (n) values, measured at 470 nm increased from 1.73 to 2.74 as the UV-A exposure prolonged indicating densification and decreasing porosity of the films. The extinction coefficient k decreased from 0.32 to 0.19 indicating reduced optical losses in the films under the UV-A exposure. The photoluminescence (PL) spectra exhibited more pronounced UV emissions which grew intense with UV-A exposure thereby improving the film quality. It is concluded that UV-A irradiation can significantly enhance the optical properties of ZrO2 films with minimal changes induced in the structure as compared to thermally treated film. Moreover, the present work indicates that water-based solution processing has the potential to produce high-quality ZrO2 films for low cost and environmental friendlier technologies. The work also highlights the use of UV-A radiations as an alternate to high temperature thermal annealing for improved quality.

Changes of UV Optical Properties of Plasma Damaged Low-k Dielectrics for Sidewall Damage Scatterometry

2008 ◽  
Vol 1079 ◽  
Author(s):  
Premysl Marsik ◽  
Adam Urbanowicz ◽  
Klara Vinokur ◽  
Yoel Cohen ◽  
Mikhail R Baklanov
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Optical Model ◽  
Concentration Profiles ◽  
Atomic Concentration ◽  
Plasma Damage ◽  
Tof Sims ◽  
Plasma Treatments ◽  
Water Based ◽  
Low K

ABSTRACTPorous low-k dielectrics were studied to determine the changes of optical properties after various plasma treatments for development of scatterometry technique for evaluation of the trench/via sidewall plasma damage. The SiCOH porogen based low-k films were prepared by PE-CVD. The deposited and UV-cured low-k films have been damaged by striping O2Cl2, O2, NH3 and H2N2 based plasmas and CF4/CH2F2/Ar etching plasma. Blanket wafers were studied in this work for the simplicity of thin film optical model. The optical properties of the damaged low-k dielectrics are evaluated the using various angle spectroscopic ellipsometry in range from 2 to 9 eV. Multilayer optical model is applied to fit the measured quantities and the validity is supported by other techniques. The atomic concentration profiles of Si, C, O and H were stated by TOF-SIMS and changes in overall chemical composition were derived from FTIR. Toluene and water based ellipsometric porosimetry is involved to examine the porosity, pore interconnectivity and internal hydrophilicity.

Studies of the double surfactant layer stabilization of water-based magnetic fluids

1991 ◽  
Vol 144 (1) ◽  
pp. 236-242 ◽  
Author(s):  
Anthony Wooding ◽  
Melvyn Kilner ◽  
David B Lambrick
Keyword(s):  
Magnetic Fluids ◽  
Water Based

RHEOLOGICAL AND MAGNETORHEOLOGICAL BEHAVIOUR OF SOME MAGNETIC FLUIDS ON POLAR AND NONPOLAR CARRIER LIQUIDS

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2765-2771 ◽  
Author(s):  
OANA BĂLĂU ◽  
DOINA BICA ◽  
MARTINA KONERACKA ◽  
PETER KOPČANSKY ◽  
DANIELA SUSAN-RESIGA ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Dynamic Viscosity ◽  
Formation Process ◽  
Colloidal Stability ◽  
Magnetic Fluids ◽  
Transformer Oil ◽  
Viscosity Data ◽  
Water Based ◽  
Magnetorheological Effect ◽  
Very High

Rheological and magnetorheological behaviour of monolayer and double layer sterically stabilized magnetic fluids, with transformer oil (UTR), diloctilsebacate (DOS), heptanol (Hept), pentanol (Pent) and water (W) as carrier liquids, were investigated. The data for volumic concentration dependence of dynamic viscosity of high colloidal stability UTR, DOS, Hept and Pent samples are particularly well fitted by the formulas given by Vand (1948) and Chow (1994). The Chow type dependence proved its universal character as the viscosity data for dilution series of various magnetic fluids are well fitted by the same curve, regardless the nonpolar or polar charcater of the sample. The magnetorheological effect measured for low and medium concentration water based magnetic fluids is much higher, due to agglomerate formation process, than the corresponding values obtained for the well stabilized UTR, DOS, Hept and Pent samples, even at very high volumic fraction of magnetic nanoparticles.

Sign in / Sign up

Export Citation Format

Share Document