Rheological properties of semidilute and concentrated aqueous solutions of cetyltrimethylammonium chloride in the presence of sodium salicylate and sodium chloride

Langmuir ◽  
1991 ◽  
Vol 7 (7) ◽  
pp. 1344-1351 ◽  
Author(s):  
F. Kern ◽  
R. Zana ◽  
S. J. Candau
Keyword(s):  
Sodium Chloride ◽  
Aqueous Solutions ◽  
Rheological Properties ◽  
Sodium Salicylate ◽  
Cetyltrimethylammonium Chloride ◽  
Concentrated Aqueous Solutions

THE SEPARATION OF CALF THYMUS NUCLEIC ACID AND HISTONE BY ALCOHOL–SALT PRECIPITATION

1955 ◽  
Vol 33 (1) ◽  
pp. 263-271 ◽  
Author(s):  
L. B. Smillie ◽  
A. M. Marko ◽  
G. C. Butler
Keyword(s):  
Sodium Chloride ◽  
Nucleic Acid ◽  
Aqueous Solutions ◽  
Distilled Water ◽  
Salt Precipitation ◽  
Salt Solutions ◽  
Desoxyribonucleic Acid ◽  
Concentrated Aqueous Solutions ◽  
Calf Thymus ◽  
Quantitative Separation

Extraction of the histone of thymonucleoprotein with alcohol and salt has been studied with varying concentrations of alcohol, sodium chloride, and nucleoprotein and with varying pH and temperature. The addition of 0.5–1.0 volumes of ethanol to a solution of nucleoprotein (approximately 1 mgm. N/ml.) in 3 M sodium chloride has been found to effect an almost quantitative separation of desoxyribonucleic acid and protein. It has proved feasible to prepare concentrated aqueous solutions of the extracted protein by successive dialysis against strong salt solutions at −10 °C. and against distilled water at 5 °C. followed by pervaporation at 5 °C. The properties of the isolated nucleate have indicated a highly polymerized product.

scholarly journals Influence of starch origin on rheological properties of concentrated aqueous solutions

2011 ◽  
Vol 65 (6) ◽  
pp. 645-655
Author(s):  
Zeljko Stojanovic ◽  
Katarina Jeremic ◽  
Slobodan Jovanovic
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Corn Starch ◽  
Loss Modulus ◽  
Potato Starch ◽  
Fractal Dimensions ◽  
Elastic Behavior ◽  
Starch Solution ◽  
Concentrated Aqueous Solutions ◽  
Slow Aggregation

The rheological properties of corn and potato starch concentrated aqueous solutions were investigated at 25?C. The starches were previously dispersed in water and the solutions were obtained by heating of dispersions at 115-120?C for 20 minutes. The solutions of potato starch were transparent, while the corn starch solutions were opalescent. The results of dynamic mechanical measurements showed that the values of viscosity, h, storage modulus, G?, and loss modulus, G?, of the corn starch solutions increased with the storage time. This phenomenon was not observed for the potato starch solutions. It was assumed that the increase of h, G? and G? is the result of starch solutions retrogradation. The potato starch solutions retrogradation did not occur probably because of the phosphates presence. The viscosity of 2 mass % corn starch solution is less than the viscosity of 2 mass % potato starch solution. By increasing the concentration of corn starch solution the gel with elastic behavior was formed. The corn starch solutions formed gel as early as at 4 mass % concentration, while potato starch solutions achieved the gel state at the concentration of 5 mass %. The value of exponent m (G? and G? ? wm) during the transition of potato starch solutions to gel is 0.414, which gives the fractal dimensions for corn starch of 2.10. The obtained value of fractal dimension corresponds to slow aggregation. The corn starch solutions with the starch concentrations higher than 4 mass % form weak gels. For these solutions the values of modulus in rubber plateau were determined. It was found that the modulus in rubber plateau increased with the concentration by the exponent of 4.36. Such high exponent value was obtained in the case when the tridimensional network is formed, i.e. when supermolecular structures like associates or crystal domains are formed.

THE SEPARATION OF CALF THYMUS NUCLEIC ACID AND HISTONE BY ALCOHOL–SALT PRECIPITATION

1955 ◽  
Vol 33 (3) ◽  
pp. 263-271 ◽  
Author(s):  
L. B. Smillie ◽  
A. M. Marko ◽  
G. C. Butler
Keyword(s):  
Sodium Chloride ◽  
Nucleic Acid ◽  
Aqueous Solutions ◽  
Distilled Water ◽  
Salt Precipitation ◽  
Salt Solutions ◽  
Desoxyribonucleic Acid ◽  
Concentrated Aqueous Solutions ◽  
Calf Thymus ◽  
Quantitative Separation

Extraction of the histone of thymonucleoprotein with alcohol and salt has been studied with varying concentrations of alcohol, sodium chloride, and nucleoprotein and with varying pH and temperature. The addition of 0.5–1.0 volumes of ethanol to a solution of nucleoprotein (approximately 1 mgm. N/ml.) in 3 M sodium chloride has been found to effect an almost quantitative separation of desoxyribonucleic acid and protein. It has proved feasible to prepare concentrated aqueous solutions of the extracted protein by successive dialysis against strong salt solutions at −10 °C. and against distilled water at 5 °C. followed by pervaporation at 5 °C. The properties of the isolated nucleate have indicated a highly polymerized product.

Rheological properties of guar and its methyl, hydroxypropyl and hydroxypropyl-methyl derivatives in semidilute and concentrated aqueous solutions

Polymer ◽  
2010 ◽  
Vol 51 (9) ◽  
pp. 1972-1982 ◽  
Author(s):  
Daniela Risica ◽  
Andrea Barbetta ◽  
Luca Vischetti ◽  
Cesare Cametti ◽  
Mariella Dentini
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Concentrated Aqueous Solutions ◽  
Methyl Derivatives

Rheological properties of semidilute and concentrated aqueous solutions of cetyltrimethylammonium bromide in the presence of potassium bromide

Langmuir ◽  
1989 ◽  
Vol 5 (5) ◽  
pp. 1225-1229 ◽  
Author(s):  
S. J. Candau ◽  
E. Hirsch ◽  
R. Zana ◽  
M. Delsanti
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Potassium Bromide ◽  
Concentrated Aqueous Solutions

Rheological properties of concentrated aqueous solutions of anionic and cationic polyelectrolyte mixtures

2008 ◽  
Vol 50 (7) ◽  
pp. 751-756 ◽  
Author(s):  
V. E. Dreval’ ◽  
G. B. Vasil’ev ◽  
E. A. Litmanovich ◽  
V. G. Kulichikhin
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Cationic Polyelectrolyte ◽  
Concentrated Aqueous Solutions

Rheological properties of semidilute and concentrated aqueous solutions of cetyltrimethylammonium bromide in the presence of potassium bromide

Langmuir ◽  
1992 ◽  
Vol 8 (2) ◽  
pp. 437-440 ◽  
Author(s):  
F. Kern ◽  
P. Lemarechal ◽  
S. J. Candau ◽  
M. E. Cates
Keyword(s):  
Aqueous Solutions ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Potassium Bromide ◽  
Concentrated Aqueous Solutions

Effect of sodium salicylate, sodium oxalate, and sodium chloride on the micellization and adsorption of sodium deoxycholate in aqueous solutions

2011 ◽  
Vol 357 (2) ◽  
pp. 434-439 ◽  
Author(s):  
Sujit Das ◽  
Jahar Dey ◽  
Teiborlang Mukhim ◽  
Kochi Ismail
Keyword(s):  
Sodium Chloride ◽  
Aqueous Solutions ◽  
Sodium Salicylate ◽  
Sodium Deoxycholate ◽  
Sodium Oxalate
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