scholarly journals The Dissolving-Rates of Spread Monolayer of Palmitic Acid into Aqueous Sodium Tetradecyl Sulfate Solution at Constant Surface Area

1981 ◽  
Vol 30 (2) ◽  
pp. 78-84
Author(s):  
Masakatsu KOSHINUMA
Keyword(s):  
Palmitic Acid ◽  
Surface Area ◽  
Sulfate Solution ◽  
Sodium Tetradecyl Sulfate ◽  
Aqueous Sodium ◽  
Spread Monolayer

scholarly journals Synthesis of Hierarchical Graphene-MnO2 Nanowire Composites with Enhanced Specific Capacitance

2019 ◽  
Vol 31 (8) ◽  
pp. 1709-1718
Author(s):  
T. Veldevi ◽  
K. Thileep Kumar ◽  
R.A. Kalaivani ◽  
S. Raghu ◽  
A.M. Shanmugharaj
Keyword(s):  
Surface Area ◽  
Electrode Materials ◽  
High Surface ◽  
Specific Capacity ◽  
High Surface Area ◽  
Rate Capability ◽  
Sulfate Solution ◽  
High Rate ◽  
Chemical Compositions ◽  
Structure Morphology

Hierarchical nanostructured graphene–manganese dioxide nanowire (G-MnO2-NW) composites have been prepared by hydrothermal synthesis route using water/1-decanol as the medium. Synthesized materials were analyzed using various characterization tools to corroborate their chemical compositions, structure/morphology and surface area. Electrochemical measurements of the synthesized G-MnO2-NW electrode materials delivered the highest specific capacity (255 Fg-1), high rate capability and improved cycling stability at 0.5 Ag–1 in 1M sodium sulfate solution and this fact may be attributed to its high surface area and porosity. Moreover, synthesized G-MnO2-NW electrodes displayed better energy and power density, when compared to the MnO2-NW based electrodes.

Formation of unusual side-products from succinimidyl esters of fatty acids during the acylation of amino acids

1982 ◽  
Vol 60 (14) ◽  
pp. 1806-1808 ◽  
Author(s):  
Alenka Paquet ◽  
Michel Bergeron
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Methyl Ester ◽  
Palmitic Acid ◽  
Sodium Hydroxide ◽  
Hydroxamic Acid ◽  
Aqueous Sodium Hydroxide ◽  
Side Product ◽  
Aqueous Sodium ◽  
Hydroxamic Acid Derivatives

A new side-product, succinohydroxamic decanoic anhydride, was isolated from the reaction mixture during the acylation of lysine by succinimidyl decanoate in the presence of aqueous sodium hydroxide. Laurie and palmitic acid derivatives were also obtained. It is shown that these compounds can be used for acylation of amino acids. The hydroxamic acid derivatives were also detected when the acylations by succinimidyl esters of fatty acids were carried out under anhydrous conditions. Preparation of N-lauroyl-L-tyrosine methyl ester from tyrosine methyl ester and succinimidyl laurate is also described.

Cementation of Lead From Lead Sulfate Slurries. III. Kinetics and Reaction Mechanisms With Iron Precipitant

1988 ◽  
Vol 41 (12) ◽  
pp. 1897 ◽  
Author(s):  
IJ Bear ◽  
RCA Flann ◽  
R Woods ◽  
JR Gardner
Keyword(s):  
Particle Size ◽  
Surface Area ◽  
Sulfate Solution ◽  
Lead Sulfate ◽  
Initial Reaction ◽  
Kinetic Regime ◽  
Fast Reaction ◽  
Steady Rate ◽  
Effective Particle ◽  
Percentage Yield

The cementation of lead from lead sulfate powders with iron metal precipitant has been studied in stirred aqueous slurries. The kinetics followed two alternative regimes analogous to those observed previously for the lead sulfate/zinc system. Kinetic regime No. 1 was characterized by an initial fast reaction and a subsequent period of stagnation or even apparent reversal. For this regime, the percentage yield for constant reaction period increased with decrease in the initial partial pulp density (IPPD) of lead sulfate. With regime No. 2, the initial reaction was slower but the reaction continued to completion at a steady rate. Also, the percentage yield for constant reaction period increased with increase in IPPD of lead sulfate. Two mechanisms (Mech. 1 and Mech. 2) corresponding to the two kinetic regimes are proposed to explain the observed kinetics and these mechanisms operate in the same way as they do for the lead sulfate/zinc system. However, the particle size/surface area of the iron was found to be the important parameter in determining which mechanism controlled the reaction, whereas it was the effective particle size/surface area of the lead sulfate when zinc was the precipitant. For the same iron powder, control of the reaction can be transferred from Mech. 1 to Mech. 2 by commencing the slurry cementation in ferrous sulfate solution rather than water. Comment is made concerning the use of iron precipitant in a commercial operation.

Sign in / Sign up

Export Citation Format

Share Document