1. Design and investigation of optical properties of N-(Rhodamine-B)-lactam-ethylenediamine (RhB-EDA) fluorescent probeEva Soršak, Julija Volmajer Valh, Špela Korent Urek, Aleksandra Lobnik, 2018, izvirni znanstveni članek Ključne besede: rhodamine B, ethylenediamine, chemical modification, fluorescence quenching, optical detection, Ag+ ions
Objavljeno v DKUM: 25.04.2018; Ogledov: 1784; Prenosov: 500
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2. Sensing heavy metals using mesoporous-based optical chemical sensorsŠpela Korent Urek, Nina Frančič, Matejka Turel, Aleksandra Lobnik, 2013, pregledni znanstveni članek Opis: 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.
Ključne besede: heavy metals, magnetic properties, structural properties, heavy metal pollution
Objavljeno v DKUM: 14.06.2017; Ogledov: 3227; Prenosov: 352
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4. Uvod v nanomateriale za uporabo v tekstilijahAleksandra Lobnik, Marijana Lakić, Aljoša Košak, Matejka Turel, Špela Korent Urek, Andreja Gutmaher, 2013, pregledni znanstveni članek Opis: 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.
Ključne besede: nanoznanost, nanotehnologija, nanomateriali, antistatične tekstilije, ojačene tekstilije, protibakterijske tekstilije, samočistilne tekstilije
Objavljeno v DKUM: 10.07.2015; Ogledov: 1964; Prenosov: 177
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5. Sol-gel-based optical sensor for the detection of aqueous aminesŠpela Korent Urek, Aleksandra Lobnik, Gerhard J. Mohr, 2007, izvirni znanstveni članek Opis: 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.
Ključne besede: analytical chemistry, optical sensors, sol-gel technology, determination of amines, fluorimetry
Objavljeno v DKUM: 01.06.2012; Ogledov: 3256; Prenosov: 95
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