Brillouin scattering in sodium nitrite at room temperature

1972 ◽  
Vol 11 (1) ◽  
pp. 255-261 ◽  
Author(s):  
G. Hauret ◽  
J. P. Chapelle ◽  
L. Taurel
Keyword(s):  
Sodium Nitrite ◽  
Room Temperature ◽  
Brillouin Scattering

scholarly journals An Alternative Process for Leaching Chalcopyrite Concentrate in Nitrate-Acid-Seawater Media with Oxidant Recovery

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 518 ◽  
Author(s):  
César I. Castellón ◽  
Pía C. Hernández ◽  
Lilian Velásquez-Yévenes ◽  
María E. Taboada
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Alkaline Solution ◽  
Sodium Nitrite ◽  
Sodium Nitrate ◽  
Room Temperature ◽  
Leaching Test ◽  
Copper Concentrate ◽  
Leaching Process ◽  
Chalcopyrite Concentrate

An alternative copper concentrate leaching process using sodium nitrate and sulfuric acid diluted in seawater followed by gas scrubbing to recover the sodium nitrate has been evaluated. The work involved leaching test carried out under various condition by varying temperature, leaching time, particle size, and concentrations of NaNO3 and H2SO4. The amount of copper extracted from the chalcopyrite concentrate leached with seawater, 0.5 M of H2SO4 and 0.5 M of NaNO3 increased from 78% at room temperature to 91% at 45 °C in 96 h and 46 h of leaching, respectively. Gas scrubbing with the alkaline solution of NaOH was explored to recover part of the sodium nitrate. The dissolved salts were recovered by evaporation as sodium nitrate and sodium nitrite crystals.

scholarly journals Determination of Diethanolamine in Shampoo Products Containing Fatty Acid Diethanolamides by Liquid Chromatography with a Thermal Energy Analyzer

2005 ◽  
Vol 88 (2) ◽  
pp. 592-594 ◽  
Author(s):  
Hardy J Chou
Keyword(s):  
Acetic Acid ◽  
Liquid Chromatography ◽  
Fatty Acid ◽  
Thermal Energy ◽  
Sodium Nitrite ◽  
Room Temperature ◽  
Energy Analyzer

Abstract A liquid chromatography (LC) method using a thermal energy analyzer (TEA) is described for the determination of diethanolamine (DEA) in shampoo products containing fatty acid diethanolamides. DEA was converted to N-nitrosodiethanolamine (NDELA) by dissolving a portion of the product in 6M acetic acid and mixing with sodium nitrite for 1 h at room temperature. The reaction mixture was dried, dissolved in acetone, and analyzed for NDELA by LC-TEA. The recovery of DEA from 2 shampoo products at fortification levels of 25, 250, and 1000 ppm ranged from 70 to 105%. Twenty shampoo products were analyzed by this method, and 19 were found to contain DEA at levels ranging from 140 to 15 200 ppm.

scholarly journals The reaction between aluminium metal and aqueous solutions of the nitrite ion

1980 ◽  
Vol 33 (1) ◽  
pp. 169 ◽  
Author(s):  
PJ Hyde ◽  
IM Ritchie
Keyword(s):  
Aqueous Solutions ◽  
Induction Period ◽  
Sodium Nitrite ◽  
Room Temperature ◽  
Nitrite Ion ◽  
Aluminium Metal ◽  
Mechanism Of The Reaction

The reaction between aluminium metal and a 0.1 wt % solution of sodium nitrite at room temperature is described. Initially the reaction is slow, but after an induction period the aluminium corrodes catastrophically. The products of the reaction were identified as ammonia, hydrogen and bayerite. A possible mechanism of the reaction is suggested.

Brillouin scattering in (NH4)2ZnCl4 above room temperature

1987 ◽  
Vol 64 (5) ◽  
pp. 797-799 ◽  
Author(s):  
A.M. Gillet ◽  
Y. Luspin ◽  
G. Hauret
Keyword(s):  
Room Temperature ◽  
Brillouin Scattering

Room temperature elastic properties of Rh-based alloys studied by surface Brillouin scattering

2014 ◽  
Vol 116 (13) ◽  
pp. 133511 ◽  
Author(s):  
C. Sumanya ◽  
B. A. Mathe ◽  
J. D. Comins ◽  
A. G. Every ◽  
M. Osawa ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Room Temperature ◽  
Brillouin Scattering

scholarly journals Sub-MHz spectral dip in a resonator-free twistedgain medium

2021 ◽  
Author(s):  
Neel Choksi ◽  
Yi Liu ◽  
Rojina Ghasemi ◽  
Li Qian
Keyword(s):  
Room Temperature ◽  
Slow Light ◽  
Brillouin Scattering ◽  
High Sensitivity ◽  
Spectral Features ◽  
New Paradigm ◽  
Microwave Photonic Filters ◽  
Spun Fiber ◽  
Brillouin Gain ◽  
Q Factors

Abstract Ultra-narrow optical spectral features have broad applications in spectroscopy, slow light, and sensing. Features approaching sub-MHz, or equivalently, Q-factors approaching 1 billion and beyond, are challenging to obtain in solid-state systems, ultimately limited by loss. We present a new paradigm to achieve tunable sub-MHz spectral features at room temperature without resonators. We exploit gain-enhanced polarization pulling in a twisted birefringent medium where polarization eigenmodes are frequency-dependent. Using Brillouin gain in a commercial spun fiber, we experimentally achieve a 0.72 MHz spectral dip, the narrowest backward Brillouin scattering feature ever reported. Further optimization can potentially reduce the linewidth to <0.1 MHz. Our approach is simple and broadly applicable, offering on-demand tunability and high sensitivity, opening a new paradigm for microwave photonic filters, slow light, and optical sensing.

Elastic Moduli of H2O: Liquid, Ice VI and Ice VII

1983 ◽  
Vol 22 ◽  
Author(s):  
M. Grimsditch ◽  
A. Rahman ◽  
A. Poliant
Keyword(s):  
Molecular Dynamics ◽  
Bulk Modulus ◽  
Room Temperature ◽  
Elastic Moduli ◽  
Brillouin Scattering ◽  
Density Measurements ◽  
Molecular Dynamics Calculations ◽  
Pressure Region ◽  
Scattering Study ◽  
High Pressure Region

ABSTRACTThe results of a Brillouin scattering study of the room temperature phases of H2;O (liquid, ice VI and ice VII) up to 30 GPa are presented. Longitudinal elastic moduli thus obtained are compared with values of the bulk modulus obtained from density measurements [1] and with both static and molecular dynamics calculations of the bulk modulus using potentials which have been proposed in studies of the liquid state. The calculations indicate that the potentials are not capable of describing the high pressure region of ice VII.

Formation of Paramagnetic Species in Sodium Nitrite irradiated at Room Temperature

Nature ◽  
1965 ◽  
Vol 206 (4979) ◽  
pp. 83-84 ◽  
Author(s):  
N. M. ATHERTON ◽  
R. N. DIXON ◽  
G. H. KIRBY
Keyword(s):  
Sodium Nitrite ◽  
Room Temperature ◽  
Paramagnetic Species
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