Preparation, Characterization and Thermo-Chromic Properties of EVA/VO2 Laminate Films for Smart Window Applications and Energy Efficiency in Building

Srirodpai, Onruthai; Wootthikanokkhan, Jatuphorn; Nawalertpanya, Saiwan; Yuwawech, Kitti; Meeyoo, Vissanu

doi:10.3390/ma10010053

Cited by 18 publications

(26 citation statements)

References 35 publications

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“…However, distribution of large and coarse particle in polymer matrix is always difficult due to low dispersion ability, resulting to non-uniform polymer-particle composite. As found in previous work [4] [12], optical and thermochromic property of polymer composite film is strongly influenced by size and distribution of particle, especially visible light transparency and IR transmittance. Figure 8d presents the TEM image of APTES coated VO2 particles prepared solely in distilled water.…”

Section: Surface Functionalization Of Monoclinic Vo2 Particles By (3-supporting

confidence: 53%

“…Therefore, metal oxide nanoparticle tends to form large agglomeration because of their tremendously high surface area/particle size ratio. As described in the previous work [4], mechanical properties and thermochromic properties of the VO2/polymer composite are strongly affected by the dispersion of the metal oxide particles in polymer matrix. This effectively correlates to interfacial adhesion, the size of nanoparticles agglomeration and the interaction between nanoparticles surface and polymer chain.…”

Section: Introductionmentioning

confidence: 71%

“…There are crystalline planes at (011), (200), (210), (220), [14]. Moreover, by applying Scherrer's equation, the crystal sizes of the synthesized VO2 particles were about 26.9 nm [4] which was revealed to be too big for VO2-based smart window application [15]. To confirm the oxidation state of VO2 particles surface functional group, X-ray photoelectron spectroscopy (XPS) was carried out and the result is shown in Fig.…”

Section: Hydrothermal Process Of Monoclinic Vo2 Particlesmentioning

confidence: 98%

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Preparation of VO2 Nanoparticles with Surface Functionalization for Thermochromic Application

Janamphansang¹,

Wootthikanokkhan²,

Nawalertpanya³

2019

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This recent work investigates on the modification of metal oxide particles surface by the addition of amorphous coating layer. This core-shell structure is expected to decrease particles aggregation and increase their distribution in polymer matrix. VO2 particles were firstly prepared via hydrothermal process with 87% yield and XRD analysis showed that VO2 monoclinic was obtained with 100% of purity. XPS technique also showed that the surface of VO2 particles contains -OH group which is promising to form the strong covalent bond with silane coupling agent. The addition of functional groups on the surface of VO2 particles was then performed by the grafting of (3-Aminopropyl) triethoxysilane (APTES) via the silane anchoring group with 1:10 weight ratio VO2/APTES. The effect of solvent was also studied by using 10 ml of different solvent such as distilled water, ethanol and chloroform during surface coating. The TEM image clearly shows the presence of the thick organic layer on VO2 particles and as a result, the core-shell structure was perfectly identified. The round shape of coated VO2 particles was detected with small aggregation by SEM imageries. Furthermore, the presence of characteristic absorption band of C-H, Si-O-C, Si-O-Si and NH stretching in the FTIR spectra of coated VO2 particles confirmed the existence of APTES on the surface of VO2 particles prepared in distilled water and ethanol.

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Section: Surface Functionalization Of Monoclinic Vo2 Particles By (3-supporting

confidence: 53%

Section: Introductionmentioning

confidence: 71%

Section: Hydrothermal Process Of Monoclinic Vo2 Particlesmentioning

confidence: 98%

See 1 more Smart Citation

Preparation of VO2 Nanoparticles with Surface Functionalization for Thermochromic Application

Janamphansang¹,

Wootthikanokkhan²,

Nawalertpanya³

2019

Self Cite

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“…Finally, the extrudate was cut and fabricated into a 0.30 (±0.04) mm thick, square-shaped (20 cm x 20 cm) film, using a hydraulic compression mold (LabTech Engineering Co., Ltd.) at 160 °C for a given time. More details concerning the compression molding and the curing time of EVA film can be seen from our earlier report [21].…”

Section: Compounding and Fabrication Of The Eva Filmsmentioning

confidence: 99%

EVA Film Reinforced with Acid Functionalized Graphene Nanoplatelets as a Transparent Barrier Layer to Enhance the Durability of Solar Cells

Yuwawech

Wootthikanokkhan

2019

IJAME

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This research work concerns the development of transparent barrier films based on ethylene vinyl acetate copolymer (EVA) reinforced with the acid functionalized graphene nanoplatelets (GNP). GNP was melt-compounded with EVA in a micro-compounder via two types of mixing schemes. The effect of concentration of GNP on the barrier, thermo-mechanical and optical properties of the EVA composite films were investigated. Water vapour transmission rate of the EVA film decreased by more than 70% after 0.001-0.01 wt% of the GNP was applied. The visible light transmittance in the range of 84-91% was maintained. SEM images showed a random distribution of GNP in the EVA matrix with intimate contact between phases. FTIR spectra imply a polar-polar interaction between the two materials. Tensile toughness of the composite films increased with the concentration of GNP. These demonstrated that the acid functionalized GNP is compatible with EVA. The degree of swelling of the cured EVA films also decreased with the GNP content. The above effects were less obvious when the mixing scheme was changed to the master-batch method. Finally, by applying the EVA/GNP film to encapsulate dye-sensitised solar cells, the lifetime of the device was prolonged by at least three weeks, with the normalised PCE value of 0.74.

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“…The materials, which were recently recognized to exhibit a distinct color change in response to change in temperature, are found in different forms, such as metal oxides, polymers, pigments, and leuco dyes. Reversible thermochromic materials are used in the applications of smart windows, ultra-thin films, temperature sensors, cool colored, and protective coatings [18][19][20][21][22][23][24][25][26]. The irreversible thermochromic materials experience a permanent color change at certain temperatures and are widely used in applications, such as aeronautical components, furnaces, damage warnings, and thermal flow sensors [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Sensing and Detection for Cementitious Materials Using Manganese Violet Pigment

Rajadurai

Lee

2020

Materials

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In recent years, advanced materials have attracted considerable interest in the field of temperature detection and sensing. This study examined the thermochromic properties of inorganic manganese violet (MV) with increasing temperature. According to the thermochromic test, the material was found to have reversible and irreversible color change properties. The MV pigment was then applied to cementitious material at ratios of 1%, 3%, and 5%. The mixed cement samples with MV pigment were heated in a furnace, and digital images were captured at each temperature interval to evaluate the changes in the color information on the surface of the specimen. The mixed samples exhibited an irreversible thermochromic change from dark violet to grayish green above 400 °C. At the critical temperature of 440 °C, the RGB values increased by approximately 22%–55%, 28%–68%, and 7%–25%, depending on the content of MV pigment. In Lab space, the L value increased by approximately 23%–60% at 440 °C. The a value completely changed from positive to negative, and the b value changed from negative to positive. All the values differed according to the content of MV pigment at room temperature but approached similar ranges at the critical temperature, irrespective of the amount of MV pigment. To assess the changes in their microstructure and composition, scanning electron microscopy and energy dispersive X-ray spectroscopy were performed on the samples exposed to temperatures ranging from room temperature to 450 °C.

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Preparation, Characterization and Thermo-Chromic Properties of EVA/VO2 Laminate Films for Smart Window Applications and Energy Efficiency in Building

Cited by 18 publications

References 35 publications

Preparation of VO2 Nanoparticles with Surface Functionalization for Thermochromic Application

Preparation of VO2 Nanoparticles with Surface Functionalization for Thermochromic Application

EVA Film Reinforced with Acid Functionalized Graphene Nanoplatelets as a Transparent Barrier Layer to Enhance the Durability of Solar Cells

High Temperature Sensing and Detection for Cementitious Materials Using Manganese Violet Pigment

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