研究目的
To develop a versatile thermo- and mechano-chromic design for smart windows that can independently control privacy and energy-saving functionalities, inspired by the cephalopod skin.
研究成果
The study presents a prototype to achieve both on-demand privacy and adaptive energy-saving functionalities on a smart window. The design can dynamically control visible transmittance (Tvib) from 60% to 17% while maintaining a fixed solar energy modulation (?Tsol) of ~11.5%. The work sets the foundation for independent dual-mode smart windows and may inspire further development in window technology, energy economization, and solar energy utilization.
研究不足
The study is limited by the need for further improvement to the prototype for practical use, such as enhancing the ?Tsol and reducing the transition temperature using high-crystallinity doped VO2 NPs, or lowering the desirable strain for the privacy mode.
1:Experimental Design and Method Selection:
The design involves well-dispersed vanadium dioxide (VO2) nanoparticles (NPs) in transparent elastomers with dynamic micro wrinkles. The methodology includes the preparation of VO2-PDMS elastomers and coating with PVA top layers.
2:Sample Selection and Data Sources:
Samples were prepared by pre-stretching the films to 175% length and releasing to its original 100% length.
3:List of Experimental Equipment and Materials:
Equipment includes UV-vis-NIR spectrophotometry, XRD, TEM, FESEM, and optical surface profiler. Materials include VO2 NPs, PDMS, PVA, and hexane.
4:Experimental Procedures and Operational Workflow:
The process involves mixing VO2 NPs with PDMS, curing, coating with PVA, and pre-stretching to form wrinkles.
5:Data Analysis Methods:
Data were analyzed using UV-vis-NIR spectra, XRD analysis, and optical microscopy.
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FESEM
6340F
JEOL
Identification of crystal morphology and size.
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Optical surface profiler
Smart proof 5
Zeiss
Measurement of surface topology.
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PDMS
Sylgard 184
Dow Corning
Transparent elastomer base for the mechanochromic structure.
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UV-vis-NIR spectrophotometry
Cary 5000
Agilent
Measurement of transmittance spectra for privacy mode.
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UV-vis-NIR spectrophotometry
Lambda 950
Perkin Elmer
Measurement of transmittance spectra for energy-saving mode.
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XRD
XRD-6000
Shimadzu
Identification of crystal phase at room temperature.
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TEM
JEM2010
JEOL
Characterization of crystal lattice and structure.
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VO2 nanoparticles
Jincheng China
Thermochromic material with temperature-dependent localized surface plasmon resonance (LSPR) for energy-saving mode.
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PVA
Sigma Aldrich
Top layer for the mechanochromic structure to form dynamic micro wrinkles.
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