Viscosimetric determination of latex coagulation

Znanstveni rad - Izvorni znanstveni rad

• Autor: I. Jalšenjak
• Autor: I. Štivić
• Autor: J . J. Petres
• Autorova ustanova: Sveučilište u Zagrebu; Farmaceutsko-biokemijski fakultet; (Zavod za farmaceutsku tehnologiju)
• Znanstveno / umjetničko područje, polje i grana: BIOMEDICINA I ZDRAVSTVO; Farmacija; Farmacija

Sažetak (engleski)

The viscosity of latices was investigated in dependence upon
the pH value of suspensions, their aging and the concentration of
added electrolyte. The systems used were well-defined monodisperse
polystyrene latices within the concentration range from 0.1 to 10/o,
and with a high negative charge oh the latex particle surface. It
was found that viscosity measurement in a dispersion at a certain
concentration of the dispersed phase could be used for latex coagulation
determination. On the basis of this finding an attempt was
made to determine the critical coagulation concentration. The values
obtained were concordant with those determined by t4rbidity
measurements. In order to determine the exact pH region in which
a decrease in the pH value leads to a sudden change of stability,
viscosity measurements were performed in relation to the pH value
of latex suspensions. The limiting pH value was independent of the
time of measuring, latex concentration, and the ionic strength of
the added electrolyte. In our opinion this value is characteristic of
a given system and it points to the dependence of the destabilization
of a dispersion on the pH value. Therefore, it can be called »critical
pH value« by analogy to the term »critical coagulation concen
tra ti on«.

• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Croatica Chemica Acta
• Brojčani podaci: vol. 51, br. 2, str. 141-150
• p-ISSN: 0011-1643
• e-ISSN: 1334-417X
• URN:NBN: urn:nbn:hr:163:673459
• Datum objave publikacije: 1978
• URL dokumenta: https://hrcak.srce.hr/195958
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Datum i vrijeme pohrane: 2020-05-05 15:10:09