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Optical chemical sensors : design and applications
Aleksandra Lobnik, Matejka Turel, Špela Korent Urek, 2012, independent scientific component part or a chapter in a monograph

Keywords: optical chemical sensors, opt(r)odes, chemical sensors
Published: 01.06.2012; Views: 864; Downloads: 6
URL Full text (0,00 KB)

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Sol-gel-based optical sensor for the detection of aqueous amines
Špela Korent Urek, Aleksandra Lobnik, Gerhard J. Mohr, 2007, original scientific article

Abstract: We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETHT 4001) into sol-gel thin films. Acid- and base-catalyzed sol-gel processes were studied to prepare stable ormosil layers using various amounts of organically modified sol-gel precursor such asmethyltriethoxysilane (MTriEOS). The sensor layers were coated with a protective layer of microporous white polytetrafluoroethylene (PTFE) in order to prevent interference from ions and ambient light. The measurements were carried out in a flow-through cell in the reflection mode. Acid-catalyzed ormosil layers (pH 1) based on the copolymerization of tetraethoxysilane (TEOS) and MTriEOS did not show any change in signal upon exposure to aqueous amine solutions, while base-catalyzed sensor layers (pH 3 and 13) showed significant changes in signal. The response time (t100) for the base-catalyzedsensor layer L3 (pH 13) upon exposure to different solutions containing 0-608 mmol L-1 aqueous propylamine was 20-30 s, the regeneration time was 70 s and the detection limit was 0.1 mmol L-1. The sensor response was reproducible and reversible. The porous ormosil layers permit dry sensor storage conditions.
Keywords: analytical chemistry, optical sensors, sol-gel technology, determination of amines, fluorimetry
Published: 01.06.2012; Views: 1252; Downloads: 5
URL Full text (0,00 KB)

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Uvod v nanomateriale za uporabo v tekstilijah
Aleksandra Lobnik, Marijana Lakić, Aljoša Košak, Matejka Turel, Špela Korent Urek, Andreja Gutmaher, 2013, review article

Abstract: Ko se velikost materialov zmanjša v eni ali več dimenzijah, se njihove fizikalne in kemijske lastnosti bistveno spreminjajo zaradi naraščanja razmerja med površino in volumnom. V tekstilni industriji se uporabljajo tako nanodelci kot nanostrukturni materiali, nanokompoziti in nanovlakna. Uporabljajo se predvsem kot funkcionalne tekstilije, ki imajo specifične lastnosti. V prispevku so obravnavani nanomateriali, ki imajo antistatično, antimikrobno, samočistilno in ojačitveno funkcijo. V nadaljnjih prispevkih bodo predstavljeni nanomateriali za razvoj hidrofobnih, UV-zaščitnih in ognjevarnih tekstilij. Posebno področje so pametne tekstilije z integriranimi nanosenzorji ali tekstilije z nadzorovanim sproščanjem aktivnih komponent, zdravil ali dišav. Zadnji prispevek bo v posebnem poglavju obravnaval učinke in tveganja nanotehnologij/nanomaterialov za okolje in zdravje.
Keywords: nanoznanost, nanotehnologija, nanomateriali, antistatične tekstilije, ojačene tekstilije, protibakterijske tekstilije, samočistilne tekstilije
Published: 10.07.2015; Views: 513; Downloads: 27
.pdf Full text (191,36 KB)

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Sensing heavy metals using mesoporous-based optical chemical sensors
Špela Korent Urek, Nina Frančič, Matejka Turel, Aleksandra Lobnik, 2013, review article

Abstract: Heavymetal pollution is one of the more serious environmental problems; therefore, there is a constant demand for the development of new analytical tools for its monitoring. An optical chemical sensor represents a good alternative to classical instrumental methods.The mesoporous materials used in optical chemical sensorsʼ fabrications have properties such as high porosity, exceptional adsorption capacity, tuneable 3D shape, geometry, and morphology, which enable improved limit of detection, response time, and selectivity properties of optical sensors. In this review, we firstly present the properties of mesoporous materials, provide a brief description of sensing mechanisms, and briefly discuss the importance of continuous monitoring. Recent advances in those mesoporous silica-based optical sensors used for heavy metal detection have been reported and their advantages and limitations also discussed. This review covers publications that have appeared since 2008.
Keywords: heavy metals, magnetic properties, structural properties, heavy metal pollution
Published: 14.06.2017; Views: 186; Downloads: 15
.pdf Full text (3,19 MB)

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