{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-OGLMIKLL/3adff7f2-a630-433e-a22b-2043881a2993/HTML","dcterms:extent":"17 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-OGLMIKLL/823cc0d1-60d3-43d0-9f34-69b9fcb516ff/PDF","dcterms:extent":"133 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:doc-OGLMIKLL/1b1bd094-a8e8-4be6-877e-f026db6fbe06/TEXT","dcterms:extent":"17 KB"}],"edm:TimeSpan":{"@rdf:about":"1998-2025","edm:begin":{"@xml:lang":"en","#text":"1998"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:doc-OGLMIKLL","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-KC6O72BG"},{"@xml:lang":"sl","#text":"Acta chimica slovenica"}],"dcterms:issued":"1998","dc:creator":["Simončič, Barbara","Špan, Jože"],"dc:format":[{"@xml:lang":"sl","#text":"10 strani"},{"@xml:lang":"sl","#text":"številka:2"},{"@xml:lang":"sl","#text":"letnik:45"},{"@xml:lang":"sl","#text":"str. 143-152"}],"dc:identifier":["ISSN:1318-0207","COBISSID:19156485","URN:URN:NBN:SI:doc-OGLMIKLL"],"dc:language":"en","dc:publisher":{"@xml:lang":"sl","#text":"Slovensko kemijsko društvo"},"dc:subject":[{"@xml:lang":"sl","#text":"fizikalna kemija"},{"@xml:lang":"sl","#text":"kritična micelna koncentracija"},{"@xml:lang":"sl","#text":"potenciometrija"},{"@xml:lang":"sl","#text":"površinsko aktivne snovi"},{"@xml:lang":"sl","#text":"raztopine"}],"dcterms:temporal":{"@rdf:resource":"1998-2025"},"dc:title":{"@xml:lang":"sl","#text":"Thermodynamics of micellization of N-alkylpyridinium chlorides| a potentiometric study|"},"dc:description":[{"@xml:lang":"sl","#text":"The critical micelle concentration (CMC) and the thermodynamics functions deltaG° mic, deltaH° mic and deltaS° mic for the micellization process of the two pyridinium cationic surfactants N-dodecilpiridinium chloride (DPC) in aqueous solution were studied by a potentiometric method using surfactant cation-sensitive membrane electrodes. The e.m.f. of the galvanic cell was measured as a function of surfactant concentration at temperatures of 15, 25, 35 and 45 °C at different concentrations of added NaCl (0.00, 0.01, 0.05, 0.1 and 0.5 mol/kg). The properties of the DPC/CPC mixture were also investigated. The results indicate that the CMC decreases at the hydrophobic character of the surfactant increases and that the addition of NaCl favours the micellization of both studied surfactants. Increase of temperature from 25 °C to 45 °C did not cause a noticeable change in the CMC of DPC, but resulted in a slight increase in the CMC of CPC. Inspection of the data for thermodynamics functions of micellization shows that the micellization of the studied surfactants is governed mainly by hydrophobic interactions between the surfactant cations, and that CPC forms micells more readily than DPC under the same conditions"},{"@xml:lang":"sl","#text":"Kritično koncentracijo micelov (CMC) in termodinamske funkcije micelizacije deltaG° mic, deltaH° mic in deltaS° mic dveh kationskih piridinijevih tenzidov N-dodecilpiridinijevega klorida (DPC) in N-cetilpiridinijevega klorida (CPC) v vodni raztopini smo določili s potenciometrično metodo, ki temelji na uporabi ionoselektivne membranske elektrode, občutljive na katione tenzida. Meritve napetosti galvanskega člena v odvisnosti od koncentracije tenzida smo opravili pri temperaturah 15, 25, 35 in 45 °C pri različnih dodatkih soli NaCl (0.00, 0.05, 0.10 in 0.50 mol/kg). Ob tem smo preučevali tudi lastnosti mešanice tenzidov DPC in CPC. Iz rezultatov meritev je razvidno, da se z večanjem hidrofobnega karakterja tenzida CMC zmanjšuje. Dodatek NaCl v raztopino proučevanih tenzidov pogojuje micelizacijo DPC kot tudi CPC. Zvišanje temperature od 25 °C do 45 °C bistveno ne vpliva na spremembo CMC tenzida DPC, medtem ko povzroči rahlo naraščanje CMC tenzida CPC. Na podlagi vrednosti termodinamskih funkcij lahko zaključimo, da so pri procesu miicelizacije proučevanih tenzidov v vodni raztopini pomembne hidrofobne interakcije"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:doc-OGLMIKLL","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:doc-OGLMIKLL"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:doc-OGLMIKLL/823cc0d1-60d3-43d0-9f34-69b9fcb516ff/PDF"},"edm:rights":{"@rdf:resource":"http://creativecommons.org/licenses/by/4.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Slovensko kemijsko društvo"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:doc-OGLMIKLL/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:doc-OGLMIKLL"}}}}