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2. Colorimetric cutoff indication of relative humidity based on selectively functionalized mesoporous silicaErika Švara Fabjan, Peter Nadrah, Anja Ajdovec, Matija Tomšič, Goran Dražić, Matjaž Mazaj, Nataša Zabukovec Logar, Andrijana Sever Škapin, 2020, original scientific article Abstract: We present a novel % cutoff concept of colorimetric indication of relative humidity based on dye dissolution in condensed water in capillaries of selectively functionalized mesoporours host SiO2 material. Consistently high levels of indoor air humidity induces mold and algae growth which represent a potential risks for human health and have deteriorating effect on walls as well. Simple localized humidity detection of high humidity with naked eye especially at places with low air circulation, where growth of mold usually starts first, is therefore highly desirable. The reporting dye was integrated in the non-functionalized mesoporous silica matrix with different pore diameters and selective-functionalized mesoporous silica material. After exposure to the environment of different air humidities the dye dissolved in water causing color change of adsorbent. With the use of adsorbents with different mesopore diameters high ability to tune the value of relative humidity when complete capillary condensation occurred was achieved. Materials with pore diameters of 3.0%nm, 3.5%nm and 7.0%nm exhibit gradual color change when reaching relative humidity up to 55, 79 and 88 RH% respectively. After selective methylation of the material with 7.0%nm pore diameter, non-gradual cutoff color change was achieved. Sample exhibited color change at narrow range of relative humidity (cutoff color change). Due to selective functionalized outer surface the dye dissolution occur only in condensed water in pores and therefore provide colorimetric indication only in this range. Selectively modified silica material has a great potential for a straightforward detection of high humid environment. Keywords: turn-on colorimetric probe, selective functionalization, mesoporous silica, relative humidity, capillary condensation Published in DiRROS: 05.09.2023; Views: 510; Downloads: 378
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5. Utilisation of waste Cu-, Mn- and Fe-loaded zeolites generated after wastewater treatment as catalysts for air treatmentMia Stanković, Margarita Popova, Matjaž Mazaj, Goran Dražić, Andraž Šuligoj, Nigel Willy Van de Velde, Mojca Opresnik, Željko Jaćimović, Nataša Novak Tušar, Nataša Zabukovec Logar, 2022, original scientific article Published in DiRROS: 13.12.2022; Views: 654; Downloads: 385
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6. Design and degradation of permanently porous vitamin C and zinc-based metal-organic frameworkTia Kristian Tajnšek, Erik Svensson Grape, Tom Willhammar, Tatjana Antonić Jelić, Uroš Javornik, Goran Dražić, Nataša Zabukovec Logar, Matjaž Mazaj, 2022, original scientific article Published in DiRROS: 31.03.2022; Views: 921; Downloads: 566
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8. Structural and CO [sub] 2 capture properties of ethylenediamine-modified HKUST-1 metal-organic frameworkNika Vrtovec, Matjaž Mazaj, Gianpiero Buscarino, Angela Terracina, Simonpietro Agnello, Iztok Arčon, Janez Kovač, Nataša Zabukovec Logar, 2020, original scientific article Keywords: functionalization, modification, adsorption, extended X-ray absorption fine structure, materials Published in DiRROS: 25.11.2020; Views: 2587; Downloads: 1064
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9. New insights into manganese local environment in MnS-1 nanocrystalsAlenka Ristić, Matjaž Mazaj, Iztok Arčon, Nina Daneu, Nataša Zabukovec Logar, Roger Gläser, Nataša Novak Tušar, 2019, original scientific article Keywords: MnS-1 nanocrystals, Mn XANES, EXAFS, zeolites, microwave-assisted hydrothermal synthesis Published in DiRROS: 23.11.2020; Views: 12320; Downloads: 1005
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