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VISible to far-IR optical tuning: passive DAYtime cooling by hierarchical structures and hybrid materials

Total Cost €


EC-Contrib. €






 VISIRday project word cloud

Explore the words cloud of the VISIRday project. It provides you a very rough idea of what is the project "VISIRday" about.

mesostructured    heat    cooling    radiatively    scattering    polymers    self    provides    entire    structured    simulations    adjusted    write    outer    visirday    lower    direct    stringent    finite    surface    ground    ant    removed    hierarchically    team    concomitantly    rules    material    green    intricate    nature    offers    hybrid    finely    solar    nm    paints    block    combine    supporting    class    daytime    mid    cold    building    spectral    radiative    absorption    polariton    examples    conceive    materials    minimized    lithography    metallic    load    consumption    sky    mix    insights    am    13    emissive    window    technologies    ir    holistic    tuneable    breaking    radiance    atmosphere    counteract    assembly    reflective    push    radically    chance    optimum    transparent    add    micro    convinced    engine    understand    nano    adjustable    inspired    complement    urgently    fibres    energy    space    influx    nanostructures    optical    beetles    structures    efficient    wavelengths    off    fundamental    device    silver    300    experimental    reflection    phonon    saharan    mesoparticles    combination    colloidal    emit    white    thermal    externally   

Project "VISIRday" data sheet

The following table provides information about the project.


Organization address
postcode: 95447

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Project website
 Total cost 1˙487˙636 €
 EC max contribution 1˙487˙636 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-03-01   to  2022-02-28


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITAT BAYREUTH DE (BAYREUTH) coordinator 1˙487˙636.00


 Project objective

Efficient daytime cooling without the need for a heat engine is an essential technology to lower our overall energy consumption. Nature offers a chance to off-load heat directly into the cold outer space via the so-called “sky window”: a spectral range from 8 – 13 µm, where our atmosphere is transparent. Concomitantly, solar radiance influx needs to be minimized by scattering and reflection, which would counteract the radiatively removed energy. VISIRday aims to provide ground-breaking new materials and concepts to emit thermal energy directly into this transparent sky window. A radically holistic approach is necessary to understand and design the optical properties of nano- and mesostructured materials over the entire spectral range (300 nm – 20 µm), with the mid-IR sky window being fully emissive, and all other spectral wavelengths being fully reflective. I will therefore combine top-down direct write lithography with intricate bottom-up colloidal self-assembly to device hierarchically structured systems fully addressing these stringent optical properties. A new material class – surface phonon polariton supporting nano- and mesoparticles – with adjustable absorption properties in the mid-IR range, will take a leading role as novel colloidal building block. In combination with polymers and metallic nanostructures my team will demonstrate hybrid structures with finely adjusted and even externally tuneable optical properties. Simulations based on finite element modelling to conceive optimum design rules will complement the experimental work. Inspired by examples from nature, namely white beetles and the Saharan silver ant, I will push the fundamental insights towards novel technologies such as radiative daytime cooling paints and fibres. I am convinced that this project provides the urgently needed materials and concepts to add radiative daytime cooling to the existing mix of green energy technologies.


year authors and title journal last update
List of publications.
2019 Philipp, A., Pech-May, N. W., Kopera, B. A. F., Lechner, A. M., Rosenfeldt, S., Retsch, M.
Direct Measurement of the In-Plane Thermal Diffusivity of Semitransparent Thin Films by Lock-In Thermography: An Extension of the Slopes Method
published pages: 8476-8483, ISSN: 0003-2700, DOI: 10.1021/acs.analchem.9b01583
Analytical Chemistry 91, 13 2020-02-27

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The information about "VISIRDAY" are provided by the European Opendata Portal: CORDIS opendata.

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