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  1. Article ; Online: Optical fiber-based open source low cost portable spectrometer system.

    Tunens, Gatis / Einbergs, Ernests / Laganovska, Katrina / Zolotarjovs, Aleksejs / Vilks, Karlis / Skuja, Linards / Smits, Krisjanis

    HardwareX

    2024  Volume 18, Page(s) e00530

    Abstract: This article explores the development of a small, compact fiber-based spectrometer system designed to overcome the limitations of standard spectrometers, such as the high cost and restricted accessibility. Operated by a Raspberry Pi, the fiber-based ... ...

    Abstract This article explores the development of a small, compact fiber-based spectrometer system designed to overcome the limitations of standard spectrometers, such as the high cost and restricted accessibility. Operated by a Raspberry Pi, the fiber-based spectrometer system uses the increased computing power to provide versatile modes of operation and powerful data processing, while maintaining a small size. Specifically crafted for basic chemistry and biology lab setups, where fibers allow measurements in different conditions, and customization enables fluorescence, light scattering, and absorption measurements. The system is adaptable and versatile, offering ease of modification and adaptation for a broad range of applications.
    Language English
    Publishing date 2024-04-18
    Publishing country England
    Document type Journal Article
    ISSN 2468-0672
    ISSN (online) 2468-0672
    DOI 10.1016/j.ohx.2024.e00530
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  2. Article ; Online: Photocatalytic Activity of TiO

    Iesalnieks, Mairis / Eglītis, Raivis / Juhna, Tālis / Šmits, Krišjānis / Šutka, Andris

    International journal of molecular sciences

    2022  Volume 23, Issue 21

    Abstract: Titanium dioxide (TiO2) coatings have a wide range of applications. Anatase exhibits hydrophilic, antimicrobial, and photocatalytic properties for the degradation of organic pollutants or water splitting. The main challenge is to obtain durable anatase ... ...

    Abstract Titanium dioxide (TiO2) coatings have a wide range of applications. Anatase exhibits hydrophilic, antimicrobial, and photocatalytic properties for the degradation of organic pollutants or water splitting. The main challenge is to obtain durable anatase nanoparticle coatings on plastic substrates by using straightforward approaches. In the present study, we revealed the preparation of a transparent TiO2 coating on polymethylmethacrylate (PMMA), widely used for organic optical fibres as well as other polymer substrates such as polypropylene (PP), polystyrene (PS), and polycarbonate (PC). The films were spin-coated at room temperature without annealing; therefore, our approach can be used for thermo-sensitive substrates. The deposition was successful due to the use of stripped ultra-small (<4 nm) TiO2 particles. Coatings were studied for the photocatalytic degradation of organic pollutants such as MB, methyl orange (MO), and rhodamine B (RB) under UV light. The TiO2 coating on PMMA degraded over 80% of RB in 300 min under a 365 nm, 100 W mercury lamp, showing a degradation rate constant of 6 × 10−3 min−1. The coatings were stable and showed no significant decrease in degradation activity even after five cycles.
    MeSH term(s) Polymethyl Methacrylate ; Temperature ; Titanium/chemistry ; Environmental Pollutants
    Chemical Substances titanium dioxide (15FIX9V2JP) ; Polymethyl Methacrylate (9011-14-7) ; Titanium (D1JT611TNE) ; Environmental Pollutants
    Language English
    Publishing date 2022-10-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms232112936
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  3. Article: Antiviral efficacy of nanomaterial-treated textiles in real-life like exposure conditions.

    Nefedova, Alexandra / Rausalu, Kai / Zusinaite, Eva / Kisand, Vambola / Kook, Mati / Smits, Krisjanis / Vanetsev, Alexander / Ivask, Angela

    Heliyon

    2023  Volume 9, Issue 9, Page(s) e20067

    Abstract: Due to the growing interest towards reducing the number of potentially infectious agents on critical high-touch surfaces, the popularity of antimicrobially and antivirally active surfaces, including textiles, has increased. The goal of this study was to ... ...

    Abstract Due to the growing interest towards reducing the number of potentially infectious agents on critical high-touch surfaces, the popularity of antimicrobially and antivirally active surfaces, including textiles, has increased. The goal of this study was to create antiviral textiles by spray-depositing three different nanomaterials, two types of CeO
    Language English
    Publishing date 2023-09-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e20067
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  4. Article: CO₂ turned into a nitrogen doped carbon catalyst for fuel cells and metal–air battery applications

    Ratso, Sander / Walke, Peter Robert / Mikli, Valdek / Ločs, Jānis / Šmits, Krišjānis / Vītola, Virgīnija / Šutka, Andris / Kruusenberg, Ivar

    Green chemistry. 2021 June 21, v. 23, no. 12

    2021  

    Abstract: Heteroatom doped metal-free catalysts are one of the most promising replacements for platinum for the alkaline oxygen reduction reaction (ORR). Due to the lack of metal atoms, they are extremely stable and environmentally friendly. However, production of ...

    Abstract Heteroatom doped metal-free catalysts are one of the most promising replacements for platinum for the alkaline oxygen reduction reaction (ORR). Due to the lack of metal atoms, they are extremely stable and environmentally friendly. However, production of carbon nanomaterials can have a very high CO₂ footprint. In this study, we present ORR catalysts made directly from CO₂via molten salt CO₂ electrolysis. The deposited carbon powder is doped with nitrogen using pyrolysis in the presence of dicyandiamide. The effect of molten carbonate electrolyte composition towards the final ORR activity in 0.1 M KOH is studied. A thorough physico-chemical study of the starting carbons and N-doped catalysts is presented with SEM and TEM imaging, BET analysis, Raman and X-ray photoelectron spectroscopy as well as the rotating disk electrode method. The onset potential and half-wave potential of the better catalyst were −50 and −175 mV vs. SCE in 0.1 M KOH, respectively.
    Keywords X-ray photoelectron spectroscopy ; batteries ; carbon ; carbon dioxide ; carbonates ; catalysts ; dicyandiamide ; electrochemistry ; electrodes ; electrolysis ; electrolytes ; green chemistry ; nitrogen ; platinum ; pyrolysis
    Language English
    Dates of publication 2021-0621
    Size p. 4435-4445.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2006274-6
    ISSN 1463-9270 ; 1463-9262
    ISSN (online) 1463-9270
    ISSN 1463-9262
    DOI 10.1039/d1gc00659b
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  5. Article ; Online: Straightforward Approach for Preparing Durable Antibacterial ZnO Nanoparticle Coatings on Flexible Substrates.

    Šutka, Andris / Mežule, Linda / Denisova, Viktorija / Meier-Haack, Jochen / Kulkarni, Akshay / Bitina, Sanda / Smits, Krisjanis / Vihodceva, Svetlana

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 22

    Abstract: Flexible antibacterial materials have gained utmost importance in protection from the distribution of bacteria and viruses due to the exceptional variety of applications. Herein, we demonstrate a readily scalable and rapid single-step approach for ... ...

    Abstract Flexible antibacterial materials have gained utmost importance in protection from the distribution of bacteria and viruses due to the exceptional variety of applications. Herein, we demonstrate a readily scalable and rapid single-step approach for producing durable ZnO nanoparticle antibacterial coating on flexible polymer substrates at room temperature. Substrates used are polystyrene, poly(ethylene-co-vinyl acetate) copolymer, poly(methyl methacrylate), polypropylene, high density polyethylene and a commercial acrylate type adhesive tape. The deposition was achieved by a spin-coating process using a slurry of ZnO nanoparticles in toluene. A stable modification layer was obtained when toluene was a solvent for the polymer substrates, namely polystyrene and poly(ethylene-co-vinyl acetate). These coatings show high antibacterial efficiency causing >5 log decrease in the viable counts of Gram-negative bacteria Escherichia. coli and Gram-positive bacteria Staphylococcus aureus in 120 min. Even after tapping these coated surfaces 500 times, the antibacterial properties remained unchanged, showing that the coating obtained by the presented method is very robust. In contrast to the above findings, the coatings are unstable when toluene is not a solvent for the substrate.
    MeSH term(s) Zinc Oxide/pharmacology ; Zinc Oxide/chemistry ; Polystyrenes ; Anti-Bacterial Agents/pharmacology ; Anti-Bacterial Agents/chemistry ; Escherichia coli ; Polymers ; Solvents ; Toluene
    Chemical Substances ethylenevinylacetate copolymer (24937-78-8) ; Zinc Oxide (SOI2LOH54Z) ; Polystyrenes ; Anti-Bacterial Agents ; Polymers ; Solvents ; Toluene (3FPU23BG52)
    Language English
    Publishing date 2022-11-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules27227672
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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  6. Article: Magnetotransport Studies of Encapsulated Topological Insulator Bi

    Kunakova, Gunta / Kauranens, Edijs / Niherysh, Kiryl / Bechelany, Mikhael / Smits, Krisjanis / Mozolevskis, Gatis / Bauch, Thilo / Lombardi, Floriana / Erts, Donats

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 5

    Abstract: The majority of proposed exotic applications employing 3D topological insulators require high-quality materials with reduced dimensions. Catalyst-free, PVD-grown ... ...

    Abstract The majority of proposed exotic applications employing 3D topological insulators require high-quality materials with reduced dimensions. Catalyst-free, PVD-grown Bi
    Language English
    Publishing date 2022-02-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12050768
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  7. Article: Liquid-assisted grinding/compression: a facile mechanosynthetic route for the production of high-performing Co–N–C electrocatalyst materials

    Kosimov, Akmal / Yusibova, Gulnara / Aruväli, Jaan / Paiste, Päärn / Käärik, Maike / Leis, Jaan / Kikas, Arvo / Kisand, Vambola / Šmits, Krišjānis / Kongi, Nadezda

    Green chemistry. 2022 Jan. 4, v. 24, no. 1

    2022  

    Abstract: Worldwide implementation of energy conversion devices such as metal–air batteries and fuel cells needs an innovative approach for the sustainable design of noble metal-free electrocatalysts. A key factor to be considered is the industry-scale production ... ...

    Abstract Worldwide implementation of energy conversion devices such as metal–air batteries and fuel cells needs an innovative approach for the sustainable design of noble metal-free electrocatalysts. A key factor to be considered is the industry-scale production method, which should be cost and energy-effective, and environmentally friendly. A novel solid-phase-based methodology is introduced herein as a new approach for the mechanosynthesis of M–N–C-type catalysts. This method employs low-cost commercially available materials, is time and energy-efficient, results in no solvent/toxic waste and does not require a complex post-synthetic treatment. The liquid-assisted grinding/compression approach yielded a series of meso- and microporous Co–N–C catalysts, with excellent bifunctional activity towards oxygen evolution and reduction reactions. In-depth physical characterization confirmed that all NaCl-supported catalysts possess cross-linked sheet-like mesoporous carbon structures with high exposure of catalytically active sites. This study provides a new avenue for the large-scale production of high-performance and low-cost M–N–C materials via energy-effective and environmentally sustainable synthetic protocols.
    Keywords carbon ; crosslinking ; design for environment ; energy efficiency ; green chemistry ; oxygen production ; physical properties ; porous media ; solvents ; toxicity ; wastes
    Language English
    Dates of publication 2022-0104
    Size p. 305-314.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2006274-6
    ISSN 1463-9270 ; 1463-9262
    ISSN (online) 1463-9270
    ISSN 1463-9262
    DOI 10.1039/d1gc03433b
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  8. Article: Tungsten-SiO

    Avotina, Liga / Bikse, Liga / Dekhtyar, Yuri / Goldmane, Annija Elizabete / Kizane, Gunta / Muhin, Aleksei / Romanova, Marina / Smits, Krisjanis / Sorokins, Hermanis / Vilken, Aleksandr / Zaslavskis, Aleksandrs

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 17

    Abstract: This study examines the electrical properties and layer quality of field emission microtriodes that have planar electrode geometry and are based on tungsten (W) and silicon dioxide ( ... ...

    Abstract This study examines the electrical properties and layer quality of field emission microtriodes that have planar electrode geometry and are based on tungsten (W) and silicon dioxide (SiO
    Language English
    Publishing date 2023-08-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16175781
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  9. Article: Antibacterial Activity of Positively and Negatively Charged Hematite (

    Vihodceva, Svetlana / Šutka, Andris / Sihtmäe, Mariliis / Rosenberg, Merilin / Otsus, Maarja / Kurvet, Imbi / Smits, Krisjanis / Bikse, Liga / Kahru, Anne / Kasemets, Kaja

    Nanomaterials (Basel, Switzerland)

    2021  Volume 11, Issue 3

    Abstract: In the current study, the antibacterial activity of positively and negatively charged spherical hematite ( ...

    Abstract In the current study, the antibacterial activity of positively and negatively charged spherical hematite (
    Language English
    Publishing date 2021-03-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano11030652
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  10. Article: Triboelectrification of nanocomposites using identical polymer matrixes with different concentrations of nanoparticle fillers

    Lapčinskis, Linards / Linarts, Artis / Mālnieks, Kaspars / Kim, Hyunseung / Rubenis, Kristaps / Pudzs, Kaspars / Smits, Krisjanis / Kovaļovs, Andrejs / Kalniņš, Kaspars / Tamm, Aile / Jeong, Chang Kyu / Šutka, Andris

    Journal of materials chemistry A. 2021 Apr. 13, v. 9, no. 14

    2021  

    Abstract: In this study, we investigate triboelectrification in polymer-based nanocomposites using identical polymer matrixes containing different concentrations of nanoparticles (NPs). The triboelectric surface charge density on polymer layers increased as the ... ...

    Abstract In this study, we investigate triboelectrification in polymer-based nanocomposites using identical polymer matrixes containing different concentrations of nanoparticles (NPs). The triboelectric surface charge density on polymer layers increased as the difference in nanoparticle filler concentration between the two triboelectric layers escalated, despite the fact that the polymer matrix was the same in both layers. This effect was observed in tests of various polymer types and filler NPs. Our mechanical experiments and finite element analysis simulations confirmed that polymeric triboelectrification is related to the surface viscoelastic deformation that occurs during mechanical contact and separation, and is not dependent on electronic or chemical properties, but rather physicochemical and mechanical properties. This supports the heterolytic scission of covalent bonds in polymer chains as an explanation for the triboelectricity. Accordingly, this study marks a significant contribution to the fundamental understanding of the mechanism of polymeric triboelectrification and will be relevant to the development of triboelectric sensors and energy harvesters.
    Keywords deformation ; energy ; finite element analysis ; heterolytic cleavage ; nanocomposites ; polymers ; viscoelasticity
    Language English
    Dates of publication 2021-0413
    Size p. 8984-8990.
    Publishing place The Royal Society of Chemistry
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d0ta12441a
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