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

Ledinek, Nina

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Title:	Določevanje kritične micelne koncentracije površinsko aktivnih snovi v vodnih raztopinah na osnovi merjenja gostote
Authors:	ID Ledinek, Nina (Author) ID Fuchs Godec, Regina (Mentor) More about this mentor... ID Bren, Urban (Comentor)
Files:	VS_Ledinek_Nina_2015.pdf (1,84 MB) MD5: 7FACCFCCBCDB793EEF6E75FC053523C4
Language:	Slovenian
Work type:	Bachelor thesis/paper
Typology:	2.11 - Undergraduate Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
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 aktive snovi, kritična micelna koncentracija, gostota, parcialni molski volumen, vodne raztopine, merjenje gostot
Place of publishing:	Maribor
Publisher:	[N. Ledinek]
Year of publishing:	2015
PID:	20.500.12556/DKUM-54276
UDC:	543.318.2(043.2)
COBISS.SI-ID:	18968598
NUK URN:	URN:SI:UM:DK:YCNKOLUL
Publication date in DKUM:	07.09.2015
Views:	2844
Downloads:	211
Metadata:
Categories:	KTFMB - FKKT
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Secondary language

Language:	English
Title:	Determination of the critical micelle concentration of surfactants in water solution by density measurement
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.
Keywords:	surface active agents, critical micelle concentration, density, partial molar volume, aqueous solutions, density measurement

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