Določevanje kritične micelne koncentracije površinsko aktivnih snovi v vodnih raztopinah na osnovi merjenja gostote

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Nina Ledinek (Author), Regina Fuchs-Godec (Mentor), Urban Bren (Co-mentor)

Abstract

Namen diplomskega dela je določiti kritično micelno koncentracijo (CMC) vodnih raztopin različnim površinsko aktivnim snovem na osnovi merjenja gostote. CMC smo določevali dvema neionskima surfaktantoma: Oktil fenol etoksilat (40) (Triton X-405), oktil fenol etoksilat (9-10) (Triton X-100); kationskemu surfaktantu: Heksadeciltrimetilamonijev bromid (CTAB); ionskemu surfaktantu: Natrijev dodecil sulfat (SDS); in obojestranskemu surfaktantu: 3-(N,N-dimetilmiristilamonijev) propansulfonat. Raztopine smo pripravljali z Milli-Q vodo, meritve pa izvajali pri sobnih pogojih (25C  1) C, v dveh paralelkah. CMC smo lahko določili na osnovi grafičnih prikazov in sicer v presečišču dveh premic, katerih naklon se v tej točki opazno spremeni. Ugotavljamo, da je merjenje gostote primerna metoda za določevanje CMC vrednosti surfaktantov v vodnih raztopinah.

Keywords

površinsko aktivne snovi;kritična micelna koncentracija;gostota;parcialno molski volumen;vodne raztopine;merjenje gostote;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[N. Ledinek]
UDC:	543.318.2(043.2)
COBISS:	18968598
Views:	1854
Downloads:	172
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Determination of the critical micelle concentration of surfactants in water solution by density measurement
Secondary abstract:	The purpose of this study is to determine the critical micelle concentration (CMC) of various surfactants within aqueous solutions on the basis of the density measurements. The CMC was determined for two non-ionic surfactants: Polyoxyethylene (40) isooctylcyclohexyl ether (Triton X-405), Polyoxyethylene (10) isooctylcyclohexyl ether (Triton X-100); cationic surfactant: Hexadecyltrimethylammonium bromide (CTAB); anionic surfactant: Dodecyl sodium sulphate (SDS); and zwitterionic surfactant: 3-(N,N-Dimethylmyristylammonio) propanesulfonate. The solutions were prepared with Milli-Q water. All the experiments were performed at a temperature of (25C  1) C. At least two independent measurements were done for each system, in order to check for the reproducibility. Two linear segments in the density molarity plots are obtained, the CMC of the surfactant was taken at the intersection of the apparently straight lines. From the intersection of the straight lines, the CMC can be determined quite accurately. It could be concluded that used method (density measurements) is suitable for determination of CMC’s values of surfactants within aqueous solutions.
Secondary keywords:	surface active agents;critical micelle concentration;density;partial molar volume;aqueous solutions;density measurement;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	IX, 34 str.
ID:	8888393