Acridine dye and its nucleotide derivative. Analysis of chemical equilibria in aqueous solution using relaxation amplitudes of temperature jump

1979 ◽  
Vol 83 (12) ◽  
pp. 1250-1254 ◽  
Author(s):  
Ping-Lu Li
Keyword(s):  
Aqueous Solution ◽  
Temperature Jump ◽  
Chemical Equilibria ◽  
Derivative Analysis ◽  
Equilibria In Aqueous Solution ◽  
Nucleotide Derivative

Schiff base equilibria. II. Beryllium complexes of N-n-butylsalicylideneimine and the hydrolysis of the Be2+ ion

1965 ◽  
Vol 18 (5) ◽  
pp. 651 ◽  
Author(s):  
RW Green ◽  
PW Alexander
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Complex Formation ◽  
Distribution Coefficient ◽  
Dilute Aqueous Solution ◽  
The Stability ◽  
Ph Range ◽  
Hydrolysis Of ◽  
Beryllium Complexes ◽  
Equilibria In Aqueous Solution

The Schiff base, N-n-butylsalicylideneimine, extracts more than 99.8% beryllium into toluene from dilute aqueous solution. The distribution of beryllium has been studied in the pH range 5-13 and is discussed in terms of the several complex equilibria in aqueous solution. The stability constants of the complexes formed between beryllium and the Schiff base are log β1 11.1 and log β2 20.4, and the distribution coefficient of the bis complex is 550. Over most of the pH range, hydrolysis of the Be2+ ion competes with complex formation and provides a means of measuring the hydrolysis constants. They are for the reactions: Be(H2O)42+ ↔ 2H+ + Be(H2O)2(OH)2, log*β2 - 13.65; Be(H2O)42+ ↔ 3H+ + Be(H2O)(OH)3-, log*β3 -24.11.

Slip velocity and temperature jump of a non-Newtonian nanofluid, aqueous solution of carboxy-methyl cellulose/aluminum oxide nanoparticles, through a microtube

2019 ◽  
Vol 29 (5) ◽  
pp. 1606-1628 ◽  
Author(s):  
Marjan Goodarzi ◽  
Saeed Javid ◽  
Ali Sajadifar ◽  
Mehdi Nojoomizadeh ◽  
Seyed Hossein Motaharipour ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Temperature Jump ◽  
Methyl Cellulose ◽  
Oxide Nanoparticles ◽  
Carboxy Methyl Cellulose ◽  
Aluminum Oxide Nanoparticles ◽  
Content Type ◽  
Carboxy Methyl

Purpose With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of using aluminum oxide nanoparticles in non-Newtonian fluid of aqueous solution of carboxy-methyl cellulose in microtube and through application of different slip coefficients to achieve various qualities on surface of microtube. Design/methodology/approach Simultaneously, the effect of presence of nanoparticles and phenomenon of slip and temperature jump has been explored in non-Newtonian nanofluid in this essay. The assumption of homogeneity of nanofluid and fixed temperature of wall in microtube has been used in modeling processes. Findings The results have been presented as diagrams of velocity, temperature and Nusselt Number and the investigations have indicated that addition of nanoparticles to the base fluid and increase in microtube slip coefficient might improve rate of heat transfer in microtube. Originality/value The flow of non-Newtonian nanofluid of aqueous solution of carboxy methyl cellulose-aluminum oxide has been determined in a microtube for the first time.

Notizen: Pentaoxoiodate(VII)monoanion as an Intermediate in the Interconversion of Hexa- and Tetraoxoiodate(VII)monoanions in Aqueous Solution

1977 ◽  
Vol 32 (1) ◽  
pp. 114-115 ◽  
Author(s):  
G. J. Buist ◽  
C. J. Holloway
Keyword(s):  
Aqueous Solution ◽  
Crucial Role ◽  
Temperature Jump ◽  
Water Molecules ◽  
Definite Evidence ◽  
Relaxation Measurements

Results from temperature-jump relaxation measurements indicate the existence of an intermediate, the pentaoxoiodate(VII)monoanion, in the hydration-dehydration equilibrium between hexa- and tetraoxoiodate(VII)monoanions in aqueous solution. The interconversion is accompanied by a considerable reorientation of the water molecules solvating the monoanionic species, which play a crucial rôle in the mechanism of hydration and dehyd ation. This is the first definite evidence for the existence of a penta coordinated periodate species in aqueous solution.

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