20.500.12556/DKUM-54276 Določevanje kritične micelne koncentracije površinsko aktivnih snovi v vodnih raztopinah na osnovi merjenja gostote Determination of the critical micelle concentration of surfactants in water solution by density measurement 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. 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. površinsko aktive snovi kritična micelna koncentracija gostota parcialni molski volumen vodne raztopine merjenje gostot surface active agents critical micelle concentration density partial molar volume aqueous solutions density measurement true true false [N. Ledinek] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2015-08-27 08:32:53 2015-09-07 10:53:37 2022-06-05 03:05:42 2021-05-11 03:15:10 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 543.318.2(043.2) 18968598 URN:SI:UM:DK:YCNKOLUL VS_Ledinek_Nina_2015.pdf VS_Ledinek_Nina_2015.pdf 1 7FACCFCCBCDB793EEF6E75FC053523C4 3f23de898c1cac24d1931d0e0ba5a21f56d09fda80e2620f85296325eed03dfa a6cf6b94-7c07-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=80214 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0