Colorimetric analysis of thermochromic samples in different forms employing a digital camera

Panák, Ondrej; Držková, Markéta; Kailová, Natálie; Syrový, Tomáš

doi:10.1016/j.measurement.2018.06.025

Cited by 14 publications

(8 citation statements)

References 32 publications

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“…The results showed that the choice of printing materials played an important role in the operability of the display. Panak et al [11] used digital cameras to record bulk systems, dry pigments, water and ink solvent formulations, and dry coatings on different paper substrates. The results showed that the dry layer of the water-based thermochromic ink coated on paper has a high value in the total length and contrast of the optical path.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

2019

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Wood surface decoration and protection has become a topic of public concern. In this paper, a temperature-sensitive and reversible thermochromic waterborne wood coating was prepared by using Chinese fir board as the base material and a waterborne wood coating with the pigment slurry of thermochromic microcapsules as the paint base. The optical properties, mechanical properties and chemical resistance of the waterborne wood coating were tested, and its microstructure was analyzed. The results showed that when the concentration of thermochromic pigment slurry was 30.0%, the thermochromic property of the waterborne wood coating was best. The gloss of the waterborne wood coating with 15.0% pigment slurry of thermochromic microcapsules was high. The concentration of thermochromic pigment slurry had no effect on the adhesion, impact resistance, or chemical resistance of the waterborne wood coating. Based on the above results, the waterborne wood coating on Chinese fir had the best comprehensive performance when the concentration of thermochromic pigment slurry was 15.0%. This work will provide a technical reference for the industrialization of the thermochromic coating film on wood.

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Section: Introductionmentioning

confidence: 99%

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

2019

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“…Some noise in the signal intensity can be observed, most probably due to a mechanical shutter of studied camera. The evaluation of variability in CIELAB colour space of ColorChecker can be found elsewhere (Panák et al, 2018).…”

Section: Stability Of the Camera Outputmentioning

confidence: 99%

“…Digital RGB cameras can be utilised in applications mapping dynamic colour change of thermochromics surfaces (Abdullah et al, 2010;Smith et al, 2001;Farina et al, 1994;Vejrazka et al, 2007;Cukurel et al, 2012;Bourque et al, 2015;Panák et al, 2018). In such cases, the most important information is the information about the magnitude of colour change in dependence of temperature.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Colour Reproduction by Pentax K10d Digital Camera Employing Polynomial Models and Icc Based Colour Management Tools

Panák¹,

Photophysics²,

Kailová³

et al. 2018

Proceedings of 9th International Symposium on Graphic Engineering and Design

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This paper deals with the characterization of a Pentax K 10 digital camera in order to be used in colorimetric measurements in a custom built setup employing a LED light source. The experiment focuses on colour characterization using several polynomial transformation models in comparison to ICC based colour characterisation. Altogether 5 polynomial models are applied and evaluated by capturing set of uniform colour patches. Preliminary results indicate, that the complexity of the model does not markedly improve the prediction of CIELAB values.

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“…Despite that, most of the studies were conducted to determine the interactions inside the TC microcapsules between the solvent-developer and color former on the colorimetric properties of the thermochromic composite [4,[19][20][21], but there is a lack of studies regarding printing substrates and thermochromic printing ink interactions. In the field of graphic technology, most of the studies recently were devoted to thermochromic printing inks end-of-life solutions [22][23][24] and their health safety [25][26][27], UV stability [28], and novel approaches in measurements of thermochromic dynamic color change [29]. The increasing packaging added value through combination of printed electronics with the thermochromism phenomenon for development of thermochromic displays on cardboard packaging [30] and development of thermochromic microencapsulated inks for smart packaging [31] was reported, as well.…”

Section: Introductionmentioning

confidence: 99%

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

et al. 2020

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In this study, the influence of physio-chemical properties of four printing substrates, fibrous papers (filter, bulky, recycled), and polymer film (synthetic paper) on the size of the thermochromic (TC) prints microcapsules was investigated. Results indicate that interaction between thermochromic ink and printing substrate determine the print morphology, i.e., porosity and roughness of printing substrate affect dimensions of TC microcapsules of resulting prints, while ink adhesion affects dimensional changes during heating–cooling cycle. Atomic force microscopy (AFM) analysis showed that microcapsules of the prints, on the surface of the smoothest synthetic paper, possess the smallest diameter and height, while, on the most porous and the most roughened surface of F paper, the microcapsules of the prints possess the highest diameter and height. By increasing the temperature to 40 °C, the biggest changes in the shape of the microcapsules (increase in height and decrease in diameter) were obtained using the surface of the hydrophilic filter paper. While using the recycled paper surface, the situation is opposite; the height and diameter of the microcapsules are reduced, and the microcapsules penetrate deeper into the paper structure (due to optimum adhesion). On the bulky paper surfaces, which are more hydrophobic than recycled paper (higher interfacial tension), the increase of temperature does not cause any significant changes in the shape and position of the microcapsules. The same behavior is observed using hydrophobic non-porous synthetic paper.

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Colorimetric analysis of thermochromic samples in different forms employing a digital camera

Cited by 14 publications

References 32 publications

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

Comparison of Colour Reproduction by Pentax K10d Digital Camera Employing Polynomial Models and Icc Based Colour Management Tools

Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

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