Aging of solutions

A mixture of benzene and methanol (19 to 1) was used for spreading the alkyl phosphonates. To minimize the influence of benzene on the film properties, the concentrations of the spreading solutions were > 1.5 X 10 3 gram per ml., and the experiments were performed at tt > 4 dynes per cm. (25). Moreover, higher proportions of methanol in the spreading solution did not alter the film properties under study for selected monolayers. For the sulfates, a mixed solvent containing water-benzene-2-propanol (1 10 10) was used because with the benzene-methanol solutions the properties of the films depended on the age of solution from which the films were prepared. Stearic and palmitic acids were spread from either hexane or the benzene-methanol solvent used for the phosphonates. Identical desorption results were obtained with the two solvents. 

PZC/IEP of Stober Silica Obtained by Aging of Solution of Si(EtO)4 and Ammonia in Aqueous Ethanol at 25°C for 4 h Electrolyte T Method Instrument pH, Reference... 

Although NCS is S bound in the solid state of trans-[Ir(pip)4(NCS)2]BPh4 (pip = piperidine), it is N bound initially in solution and in the solid state when NCS is the counter-ion. With both counter-ions prolonged aging of solutions yields the S-bound complex. The M—O bond is retained during the reaction of [Ir(NH3)50H] and propionic anhydride to give the propionate complex. Iridium(iii) complexes of 3,3 -diamino-4,4 -dihydroxy-diphenylsulphone and R X=NR (X = N or CH), IrHCl(N—C)(PR3)2, have been isolated. 

Table V. Actual vs. Calculated H+ Ion Concentration Changes During the Aging of Solutions from 23 Hours to 254—259 Days (Mole/Liter X 105)...

Sample 10 3Mwls PAA (daltons) Cure Conditions Film (/im) Thickness Age of Solution 10 3Mwls PI (daltons) [r ] in H2S04 ml/g... 

Fig.3. Variation of the radius R with ageing of solution, Polyethyleneoxide = 660000 concentration c = 280 ppm.

Age of Solution time at 25 C Remaining as Monomer (%) Particle Size of Polymer (nm) (From Solubility) Relative Rate of Reaction with Molybdic Acid... 

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