diplomsko delo univerzitetnega študijskega programa I. stopnje
Ana Ambrož (Author), Marjana Simonič (Mentor), Julija Volmajer Valh (Co-mentor)

Abstract

Namen diplomske naloge je bil priprava okolju prijaznih etil celuloznih mikrokapsul s citriodiolom, ki bodo omogočale kontrolirano sproščanje izbrane organske snovi v okolico. Sintetizirali smo jih s homogeniziranjem organske in vodne faze. Ugotovili smo, da so bile mikrokapsule, ki so nastale ob mešanju s homogenizatorjem, bolj enakomernih velikosti kot tiste, mešane z magnetnim mešalom. Nastale mikrokapsule smo okarakterizirali z določitvijo polidisperznega indeksa, velikosti nastalih delcev in zeta potenciala. Ugotovljena je bila odvisnost velikosti nastalih mikrokapsul od načina mešanja, pri dodajanju organske faze k vodni fazi. Sproščanje citriodiola iz mikrokapsul smo merili z UV/VIS spektroskopijo, pri čemer smo spremljali časovno spreminjanje absorbance pri določeni valovni dolžini. Vrednosti merjenih absorbanc se po eno mesečnem merjenju niso znatno spremenile, kar pripisujemo zanemarljivi količini sproščenega citriodiola. Z merjenjem FTIR spektra citriodiola, etil celuloze in nastalih mikrokapsul, smo ugotavljali prisotnost aktivne komponente na ovoju ali v notranjosti mikrokapsule. Zaradi ujemajočih FTIR spektrov etil celuloze in vzorca etil celuloznih mikrokapsul, smo potrdili prisotnost citriodiola v notranjosti mikrokapsul. Nahajanje citriodiola v jedru mikrokapsul, je bilo vidno tudi s konfokalnim mikroskopom.

Keywords

mikrokapsule;citridiol;etil celuloza;spektroskopija;kontrolirano sproščanje;hlapne organske spojine;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: [A. Ambrož]
UDC: 543.42:661.71(043.2)
COBISS: 21968150 Link will open in a new window
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Downloads: 89
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Other data

Secondary language: English
Secondary title: Preparation of environmentally friendly microcapsules for controlled release of volatile organic compounds
Secondary abstract: The purpose of the diploma thesis was the preparation of environmentally friendly ethyl cellulose microcapsules with citriodol, which will enable the controlled release of the selected organic matter into the environment. They were synthesized by homogenizing the organic and aqueous phase. It was found that the microcapsules formed when mixed with the homogenizer were more uniform than those mixed with a magnetic stirrer. The resulting microcapsules were characterized by the determination of the polydispersion index, the size of the resulting particles and the zeta potential. The dependence of the size of the resulting microcapsules on the method of mixing while adding the organic phase to the aqueous phase was determined. The release of citriodol from microcapsules was measured by UV / VIS spectroscopy, while the time-varying absorbance was monitored at certain wavelengths. The values of the measured absorbances did not change significantly after one month, which is attributed to the negligible amount of released citriodiol. By measuring the FTIR spectrum of citriodiol, ethyl cellulose and the resulting microcapsules, the presence of the active component on the wall or core of the microcapsules was determined. Due to the matching FTIR spectra of ethyl cellulose and the sample of ethyl cellulose microcapsules, the presence of citriodiol in the microcapsules was confirmed. The finding of citriodol in the core of the microcapsules was also apparent with a confocal microscope.
Secondary keywords: microcapsule;citridiol;ethyl cellulose;spectroscopy;controlled release;volatile organic compounds;
URN: URN:SI:UM:
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages: VIII, 37 str.
ID: 10950423