RTU Research Information System
Latviešu English

Publikācija: Optical Properties of Electrophoretically Manipulated ZnO Nanowire Suspensions and Their High Application Potential in Smart Window Devices

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Optical Properties of Electrophoretically Manipulated ZnO Nanowire Suspensions and Their High Application Potential in Smart Window Devices
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Andris Šutka
Martin Timusk
Kristjan Saal
Vambola Kisand
Keywords ZnO Nanowires, Smart Window
Abstract Optical properties of zinc oxide nanowire (NW) dilute suspensions in polydimethylsiloxane (PDMS) were investigated. Optical transmittance was found to decrease at the transition from chaotically oriented state to electrophoretically ordered state with the alignment of the NW along the direction of incident light. Previously reported observations of the behavior of dispersions containing oblong particles indicate that the transition of the orientation of particles from chaotic to ordered state induces increase in transmittance that may be attributed to the decrease of absorption or scattering cross-section. The measurements carried out in this study on ZnO nanorod suspensions demonstrate an unexpected opposite effect – the transmittance of the suspensions decreases significantly as orientational order is induced in the suspension. The observed behavior was employed in Smart Window technologies. Smart windows are gaining interest due to the potential for increased energy efficiency in building and transport, as well as in providing privacy in office and living rooms without loss of natural illumination. We demonstrate up to 40% change of transmittance in 0.05 vol % ZnO NWs dispersed in PDMS in a simple test cell as NW alignment is induced electrophoretically. Obtained dilute NW suspensions exhibit spontaneous recovery, excellent cycling stability (0% of contrast change after more than 10 cycles) and stability against sedimentation. Overall we describe a scalable concept for a smart window device based on dilute ZnO NW suspensions in PDMS.
Reference Šutka, A., Timusk, M., Saal, K., Kisand, V. Optical Properties of Electrophoretically Manipulated ZnO Nanowire Suspensions and Their High Application Potential in Smart Window Devices. In: 4th Nano Today Conference: Thesis, United Arab Emirates, Dubai, 6-10 December, 2015. Dubai: Elsevier, 2015, pp.Q1‐18-Q1‐18.
Full-text Full-text
ID 21579