Metal-monolayer interactions in aqueous systems. Part I.—The interaction of monolayers of long-chain polar compounds with metal ions in the underlying solution

1950 ◽  
Vol 46 (0) ◽  
pp. 475-487 ◽  
Author(s):  
G. A. Wolstenholme ◽  
J. H. Schulman
Keyword(s):  
Metal Ions ◽  
Polar Compounds ◽  
Aqueous Systems ◽  
Long Chain

scholarly journals On the mechanism of boundary lubrication. II. Wear prevention by addition agents

1940 ◽  
Vol 177 (968) ◽  
pp. 103-118 ◽  
Keyword(s):  
High Pressures ◽  
Preceding Paper ◽  
Accurate Method ◽  
Polar Compounds ◽  
Experimental Conditions ◽  
Group V ◽  
Highly Sensitive ◽  
Local Pressures ◽  
Steel Balls ◽  
Long Chain

If two metal surfaces slide over each other in the presence of a lubricant and under high load, high pressures and temperatures prevail a t those isolated spots which actually carry the load, leading to wear and possibly to breakdown. The action of wear preventing agents under these conditions has been studied in detail and it has been found that such agents are effective through their chemical polishing action, by which the load becomes distributed over a larger surface and local pressures and temperatures are decreased. Especially effective are compounds containing phosphorus or other elements of group V of the periodic system. These have been found to form a metal phosphide or homolog on the surface which is able to alloy with the metal surface, lowering its melting point markedly, and by this action aiding greatly in maintaining a polish. The wear experiments were carried out with a highly sensitive and accurate method which uses metal-plated steel balls as its sliding elements. Under the experimental conditions additions of 1.5% triphenyl phosphine or triphenyl arsine in white oil gave wear prevention factors of 7.2 and 12.2 respectively (relative to pure white oil). A further addition of 1% of a long chain polar compound is able to double the wear prevention factor obtained with the polishing agents and wear prevention factors as high as 17.6 have been observed. The specifically physical action of the long-chain polar compounds is discussed in the preceding paper.

Evaluation of adsorption processes of metal ions in multi-element aqueous systems by lignocellulosic adsorbents applying different isotherms: A critical review

2019 ◽  
Vol 357 ◽  
pp. 404-420 ◽  
Author(s):  
Jordan Brizi Neris ◽  
Francisco Heriberto Martinez Luzardo ◽  
Erik Galvão Paranhos da Silva ◽  
Fermin Garcia Velasco
Keyword(s):  
Metal Ions ◽  
Critical Review ◽  
Aqueous Systems ◽  
Adsorption Processes

Synthesis of “three-legged” tri-dentate podand ligands incorporating long-chain aliphatic moieties, for water remediators, and for isolating metal ions in non-aqueous solution

2018 ◽  
Vol 3 (11) ◽  
Author(s):  
Justin Pothoof ◽  
Michal Ruprecht ◽  
Ben D. Sliwinski ◽  
Ben M. Sosnowski ◽  
Polly R. Fitzgerald ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Ambient Temperature ◽  
Water Remediation ◽  
Schiff’S Base ◽  
Aliphatic Aldehydes ◽  
Long Chain

Abstract Two molecules, each including tris-2-amino-ethyleneamine (tren), have been produced using a Schiff’s base condensation and long-chain, aliphatic aldehydes. The syntheses are straightforward and can be run in air at ambient temperature. The ability of these molecules to complex with metal ions makes them good candidates for water remediation. The ability of these ligands to hold metal ions in 0.03 M non-aqueous solutions was unexpected. Their syntheses and characterization are discussed.

Construction of a 1-D Sm(iii) coordination polymer with a long-chain Schiff base ligand: dual-emissive response to metal ions

2020 ◽  
Vol 7 (2) ◽  
pp. 464-469 ◽  
Author(s):  
Jieni Liu ◽  
Ting Zhu ◽  
Xiaoping Yang ◽  
Hongfen Chen ◽  
Dongliang Shi ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Metal Ions ◽  
Schiff Base Ligand ◽  
Ppm Level ◽  
Long Chain

A 1-D coordination polymer [Sm(HL)2(NO3)]n was constructed using a new flexible Schiff base ligand that has a long-chain (CH2)10 backbone, and it shows dual-emissive response to metal ions, especially to Co2+ at the ppm level.

Density Functional Theory Study on the Interactions of Metal Ions with Long Chain Deprotonated Carboxylic Acids

2015 ◽  
Vol 119 (40) ◽  
pp. 10195-10203 ◽  
Author(s):  
Aleksandar Y. Mehandzhiyski ◽  
Enrico Riccardi ◽  
Titus S. van Erp ◽  
Henrik Koch ◽  
Per-Olof Åstrand ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Metal Ions ◽  
Carboxylic Acids ◽  
Density Functional ◽  
Density Functional Theory Study ◽  
Functional Theory ◽  
Long Chain

scholarly journals The heat of adsorption of long-chain compounds and their effect on boundary lubrication

1944 ◽  
Vol 182 (990) ◽  
pp. 270-285 ◽  
Keyword(s):  
Transition Temperature ◽  
Surface Concentration ◽  
Temperature Characteristic ◽  
Polar Compounds ◽  
Heat Of Adsorption ◽  
Particular Solution ◽  
Steel Surfaces ◽  
Frictional Behaviour ◽  
Long Chain ◽  
Good Agreement

The frictional behaviour between mild steel surfaces lubricated with solutions in white oil of long-chain halides, acids, a -substituted acids, esters, cyanide, thiocyanate and a nitro derivative has been investigated under high loads at low speeds. In all cases a transition from smooth sliding to stick-slips occurs at a temperature characteristic of the particular solution employed. For each substance the transition temperature increases 'with the concentration. Each solution builds up, and is in equilibrium with, an adsorbed and oriented film of the polar compound on the surface. Assuming that the transition occurs when the surface concentration of this film decreases to a certain value which, for any one material is independent of temperature, an equation has been deduced relating the concentration, and transition temperature with the heat of adsorption U . All the experimental results are in good agreement with this equation. The values of U show that these long-chain polar compounds are adsorbed by the interaction of their dipoles with the atom s in the metal surface, and not by any chemical reaction. The results also suggest that the esters are similarly oriented at metal and at aqueous surfaces.

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