Increasing contact ion pairing in the supercooled and glassy states of "dilute" aqueous magnesium, calcium, and strontium nitrate solution: implications for biomolecules

1993 ◽  
Vol 97 (18) ◽  
pp. 4806-4814 ◽  
Author(s):  
Gerhard Fleissner ◽  
Andreas Hallbrucker ◽  
Erwin Mayer
Keyword(s):  
Nitrate Solution ◽  
Ion Pairing ◽  
Strontium Nitrate

Tire Cord Dip Pick Up by Atomic Absorption Spectroscopy

1974 ◽  
Vol 47 (2) ◽  
pp. 448-453 ◽  
Author(s):  
J. L. Firkins
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Graphite Furnace ◽  
Nitrate Solution ◽  
Strontium Nitrate ◽  
Tire Cord ◽  
Absolute Level ◽  
Resorcinol Formaldehyde ◽  
Total Analysis

Abstract Graphite furnace atomic absorption spectroscopy has been used to develop a quick and accurate test for tire cord dip pick up. Strontium nitrate solution is added to either predips or resorcinol-formaldehyde latex dips at predetermined levels of a few parts per million. Sufficient replicate analyses of one to three milligram samples of treated cord can be run to provide reliable data on both the absolute level of dip pick up and the short term uniformity of the dip. The technique offers substantial advantages in both turn-around time and total analysis time relative to wet gravimetric techniques in current use.

Low temperature synthesis of ultrafine strontium titanate (SrTiO3) powders

1992 ◽  
Vol 7 (2) ◽  
pp. 429-434 ◽  
Author(s):  
H.S. Potdar ◽  
S.B. Deshpande ◽  
P.D. Godbole ◽  
V.G. Gunjikar ◽  
S.K. Date
Keyword(s):  
Low Temperature ◽  
Strontium Titanate ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Strontium Nitrate ◽  
Distilled Water ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Oxalate Solution ◽  
Titanyl Oxalate

Ultrafine (≍0.4 μm) strontium titanate powder was synthesized using strontium nitrate and potassium titanyl oxalate as precursors. An aqueous (0.1 M) potassium titanyl oxalate solution was added dropwise to a (0.1 M) strontium nitrate solution with continuous stirring at room temperature to precipitate strontium titanyl oxalate (STO). The precipitate, after careful washing with distilled water several times, was air-dried and calcined at 550 °C/6 h to obtain homogeneous, spherical, stoichiometric powder of SrTiO3 ≍0.4 μm in size. The calcined powder was characterized using different techniques such as XRD, DTA/TG/DTG, SEM, and IR.

Raman Spectral Studies of Aqueous Strontium Nitrate Solution Up to 450 °C and 40 MPa

1998 ◽  
Vol 71 (8) ◽  
pp. 1763-1769 ◽  
Author(s):  
Yutaka Ikushima ◽  
Kiyotaka Hatakeda ◽  
Norio Saito ◽  
Masahiko Arai
Keyword(s):  
Nitrate Solution ◽  
Spectral Studies ◽  
Strontium Nitrate ◽  
Raman Spectral

Ion Pairing and Dielectric Decrement in Glycosaminoglycan Brushes

2020 ◽  
Author(s):  
James Sterling ◽  
Wenjuan Jiang ◽  
Wesley M. Botello-Smith ◽  
Yun L. Luo
Keyword(s):  
Molecular Dynamics ◽  
Ion Pairs ◽  
Mean Field ◽  
Salt Bridge ◽  
Ion Pairing ◽  
Donnan Potential ◽  
Mean Field Models ◽  
Ion Exclusion ◽  
Dynamics Simulations ◽  
Contact Ion Pairs

Molecular dynamics simulations of hyaluronic acid and heparin brushes are presented that show important effects of ion-pairing, water dielectric decrease, and co-ion exclusion. Results show equilibria with electroneutrality attained through screening and pairing of brush anionic charges by cations. Most surprising is the reversal of the Donnan potential that would be expected based on electrostatic Boltzmann partitioning alone. Water dielectric decrement within the brush domain is also associated with Born hydration-driven cation exclusion from the brush. We observe that the primary partition energy attracting cations to attain brush electroneutrality is the ion-pairing or salt-bridge energy associated with cation-sulfate and cation-carboxylate solvent-separated and contact ion pairs. Potassium and sodium pairing to glycosaminoglycan carboxylates and sulfates consistently show similar abundance of contact-pairing and solvent-separated pairing. In these crowded macromolecular brushes, ion-pairing, Born-hydration, and electrostatic potential energies all contribute to attain electroneutrality and should therefore contribute in mean-field models to accurately represent brush electrostatics.

Electrochemistry at anthracene crystal/aqueous nitrite, nitrate solution interface

1988 ◽  
Vol 92 (9) ◽  
pp. 2506-2511
Author(s):  
Baldwin Leong ◽  
Martin Pope ◽  
Joseph Steigman
Keyword(s):  
Nitrate Solution ◽  
Solution Interface ◽  
Anthracene Crystal ◽  
Nitrite Nitrate
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