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  1. Article ; Online: Energy-saving potential of thermochromic coatings in transparent building envelope components

    Fahland, Matthias / Szelwicka, Jolanta / Langgemach, Wiebke

    2023  

    Abstract: 197 ... 210 ... Advances in the energy management of buildings are essential for reducing the carbon footprint in the building sector. Applying special window coatings of varying optical properties offers new chances for improved energy efficiency. ... ...

    Abstract 197

    210

    Advances in the energy management of buildings are essential for reducing the carbon footprint in the building sector. Applying special window coatings of varying optical properties offers new chances for improved energy efficiency. Thermochromic vanadium oxide (VO2) is an important material for this development and is, therefore, one of the most investigated thermochromic materials. It changes its transmittance in the infrared spectral range in response to a changing temperature. In this study, VO2 coating was deposited on ultra-thin flexible glass in a continuous roll-to-roll sputtering process. The thermochromic layer had a thickness of 70 nm, and it was embedded between two zirconium oxide layers of 170 nm each. The luminous transmittance of the stack was 50%. A solar modulation of 9.6% was reached between the low and high-temperature states. The transition temperature between the cold infrared transparent and the warm infrared opaque state was determined to be 22°C. Different application scenarios for this material were evaluated. The modulation of the solar transmittance was calculated for the combination of VO2 with state-of-the-art low-e coatings. Our findings show that such a combination does not offer a benefit for reducing the energy demand of a building. However, a stand-alone implementation of thermochromic coatings has a high potential if the energy consumption of the building is dominated by cooling demands.

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    Keywords smart coatings ; energy saving ; radiative cooling ; smart windows ; electrochromic coatings ; thermochromic coatings ; energy efficiency ; vanadium oxide ; DDC::600 Technik ; Medizin ; angewandte Wissenschaften
    Subject code 620
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Transfer of the sputter technique for deposition of strongly thermochromic VO2-based coatings on ultrathin flexible glass to large-scale roll-to-roll device

    Rezek, Jiri / Szelwicka, Jolanta / Vlček, Jaroslav / Čerstvý, Radomír / Houška, Jiří / Fahland, Matthias / Fahlteich, John

    2022  

    Abstract: The reversible semiconductor-to-metal transition of vanadium dioxide (VO2) makes VO2-based coatings a promising candidate for thermochromic smart windows, reducing the energy consumption of buildings. We report on transfer of the sputter technique for ... ...

    Abstract The reversible semiconductor-to-metal transition of vanadium dioxide (VO2) makes VO2-based coatings a promising candidate for thermochromic smart windows, reducing the energy consumption of buildings. We report on transfer of the sputter technique for deposition of strongly thermochromic ZrO2/W-doped VO2/ZrO2 coatings on ultrathin (0.1 mm) flexible glass from a laboratory-scale device with three (V, W and Zr) planar magnetron targets to a large-scale roll-to-roll device with two (W-doped V and ZrO2) rotatable magnetron targets. The depositions were performed at a relatively low substrate surface temperature (330-350 °C) and without any substrate bias voltage. The W-doped VO2 layers were deposited using a reactive high-power impulse magnetron sputtering with a pulsed O2 flow control. We compare the process parameters used in both deposition devices and explain the basic principle of this sputter technique using the discharge characteristics measured during a large-scale roll-to-roll deposition. We characterize the design, structure (X-ray diffraction) and optical properties (spectrophotometry and spectroscopic ellipsometry) of the three-layer coatings. The coatings prepared on ultrathin flexible glass using the large-scale roll-to-roll device at a temperature close to 350 °C exhibit a low transition temperature of 22 °C, an integral luminous transmittance over 45% and a modulation of the solar energy transmittance approaching 10%. This is a promising first step to a cost-effective and high-rate preparation of large-area thermochromic VO2-based coatings for future smart-window applications.

    442
    Keywords Vanadium dioxide ; Strongly thermochromic coatings ; Roll-to-roll device ; Pulsed magnetron sputtering ; Ultrathin flexible glass ; Smart windows ; DDC::600 Technik ; Medizin ; angewandte Wissenschaften
    Subject code 620
    Language English
    Publishing date 2022-02-24
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  3. Article ; Online: Facile synthesis of ultrasmall polydopamine-polyethylene glycol nanoparticles for cellular delivery.

    Harvey, Sean / Ng, David Yuen Wah / Szelwicka, Jolanta / Hueske, Lisa / Veith, Lothar / Raabe, Marco / Lieberwirth, Ingo / Fytas, George / Wunderlich, Katrin / Weil, Tanja

    Biointerphases

    2018  Volume 13, Issue 6, Page(s) 06D407

    Abstract: Very small polydopamine (PDA) polyethylene glycol (PEG) crosslinked copolymer (PDA-PEG) nanoparticles have been prepared following a convenient one-step procedure in aqueous solution. Particle sizes and colloidal stabilities have been optimized by ... ...

    Abstract Very small polydopamine (PDA) polyethylene glycol (PEG) crosslinked copolymer (PDA-PEG) nanoparticles have been prepared following a convenient one-step procedure in aqueous solution. Particle sizes and colloidal stabilities have been optimized by varying PEG in view of chain length and end group functionalities. In particular, amine-terminated PEG3000 [PEG
    MeSH term(s) Colloids/chemistry ; Fluorescent Dyes/metabolism ; Indoles/chemical synthesis ; Nanoparticles/chemistry ; Organic Chemistry Phenomena ; Particle Size ; Polyethylene Glycols/chemical synthesis ; Polymers/chemical synthesis
    Chemical Substances Colloids ; Fluorescent Dyes ; Indoles ; Polymers ; polydopamine ; Polyethylene Glycols (3WJQ0SDW1A)
    Language English
    Publishing date 2018-10-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2234510-3
    ISSN 1559-4106 ; 1934-8630
    ISSN (online) 1559-4106
    ISSN 1934-8630
    DOI 10.1116/1.5042640
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultrathin Polydopamine Films with Phospholipid Nanodiscs Containing a Glycophorin A Domain

    Marchesi D'Alvise, Tommaso / Harvey, Sean / Hueske, Lisa / Szelwicka, Jolanta / Veith, Lothar / Knowles, Tuomas P.J. / Kubiczek, Dennis / Flaig, Carolin / Port, Fabian / Gottschalk, Kay E. / Rosenau, Frank / Graczykowski, Bartlomiej / Fytas, George / Ruggeri, Francesco S. / Wunderlich, Katrin / Weil, Tanja

    Advanced Functional Materials

    2020  Volume 30, Issue 21

    Abstract: Cellular membranes have long served as an inspiration for nanomaterial research. The preparation of ultrathin polydopamine (PDA) films with integrated protein pores containing phospholipids and an embedded domain of a membrane protein glycophorin A as ... ...

    Abstract Cellular membranes have long served as an inspiration for nanomaterial research. The preparation of ultrathin polydopamine (PDA) films with integrated protein pores containing phospholipids and an embedded domain of a membrane protein glycophorin A as simplified cell membrane mimics is reported. Large area, ultrathin PDA films are obtained by electropolymerization on gold surfaces with 10–18 nm thickness and dimensions of up to 2.5 cm2. The films are transferred from gold to various other substrates such as nylon mesh, silicon, or substrates containing holes in the micrometer range, and they remain intact even after transfer. The novel transfer technique gives access to freestanding PDA films that remain stable even at the air interfaces with elastic moduli of ≈6–12 GPa, which are higher than any other PDA films reported before. As the PDA film thickness is within the range of cellular membranes, monodisperse protein nanopores, so-called “nanodiscs,” are integrated as functional entities. These nanodisc-containing PDA films can serve as semi-permeable films, in which the embedded pores control material transport. In the future, these simplified cell membrane mimics may offer structural investigations of the embedded membrane proteins to receive an improved understanding of protein-mediated transport processes in cellular membranes.
    Keywords freestanding ultrathin films ; glycophorin A ; membrane mimics ; nanodiscs ; polydopamine
    Subject code 620
    Language English
    Publishing country nl
    Document type Article ; Online
    ZDB-ID 2039420-2
    ISSN 1616-3028 ; 1616-301X
    ISSN (online) 1616-3028
    ISSN 1616-301X
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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