Optical and structural dynamical behavior of Crystal Violet Lactone – Phenolphthalein binary thermochromic systems

Rădiţoiu, Alina; Rădiţoiu, Valentin; Nicolae, Cristian‐Andi; Raduly, Florentina Monica; Amăriuţei, Viorica; Wagner, Luminiţa Eugenia

doi:10.1016/j.dyepig.2016.06.046

Cited by 51 publications

(26 citation statements)

References 37 publications

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“…As Fig. 3a shows, in the spectra of ruptured microcapsules, the characteristic absorbance peak at 1746 cm À1 is assigned to the C]O stretching vibration in CVL, 26,27 which veried the successful encapsulation of microcapsules. During the grinding process of microcapsules, CVL reacts with hydroxyl groups on silicon dioxide in the agate mortar as Fig.…”

Section: Characterization Of Microcapsulesmentioning

confidence: 99%

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

Wang

Zheng

et al. 2020

RSC Adv.

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Section: Characterization Of Microcapsulesmentioning

confidence: 99%

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

Wang

Zheng

et al. 2020

RSC Adv.

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“…The switching temperature has been reported to be around the mp of the solvents, presenting an obvious colour difference [16]. To examine the actual value of the switching temperature, the colour difference in thermochromic colorants prepared with BCP, stearic acid and different long-chain alkyl alcohols (dodecanol, tetradecanol, hexadecanol and octadecanol) was tested while heating from 10 to 80°C (Figure 4).…”

Section: The Switching Temperaturementioning

confidence: 99%

“…The trend of the cooling curve is basically consistent with the heating curve, except for a hysteresis loop, which demonstrates that the colour transforms reversibly as a function of temperature. The hysteresis phenomenon was reported to be associated with physical transformations and chemical interactions established in the system of BCP, stearic acid and hexadecanol during the melting of hexadecanol [16]. A more specific investigation of colour changing during the process of thermochromic transition was conducted by analysing the evolution of a* and b* values.…”

Section: The Reversible Propertymentioning

confidence: 99%

“…In recent decades, the reversible thermochromic performance, structural, optical and thermal properties, and the colour intensity of leuco‐dye thermochromic colorants, have been studied extensively. It has been reported that the reversible processes are associated with hydrogen‐bond establishment, solvents’ phase transition and the dissolution of compounds . The structural, optical and thermal properties of leuco‐dye thermochromic colorants were correlated with the developer .…”

Section: Introductionmentioning

confidence: 99%

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A sultone‐based reversible dark red‐yellow conversion thermochromic colorant with adjustable switching temperature

Wan

Zeng

et al. 2018

Coloration Technology

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A reversible, adjustable thermochromic colorant with bichromatic conversion from dark red (cool state) to yellow (heat state) was prepared using bromocresol purple (BCP) as colour former. The thermochromic behaviour of this colorant was investigated during the heating‐cooling cycle, including the colour depth, colour difference and switching temperature. The mechanism of thermochromic colorant switching between dark red and yellow originated from the transformation of the conjugated structures of BCP, which was confirmed by infrared spectrometry. The switching temperature can be flexibility adjusted between 13–46 °C by mixing solvents according to Schröder's equation, which was demonstrated by differential scanning calorimetry measurement. The thermochromic colorant presented good reversible thermochromic performance with stable changes in colour parameters for 50 heating‐cooling cycles. This sultone‐based reversible dark red‐yellow conversion thermochromic colorant is suitable for application as thermal‐indicating material under various conditions.

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“…Because of their characteristic of color change, we use SZSO and YOS as the luminous sources to generate blue and red luminescence to complement the color change property of HSGP. HSGP was utilized as a heat-stimulating agent that develops the link between heat and luminescence at low temperature [21]. The theoretical thermochromic temperature of HSGP is 28 °C (this can be verified by differential scanning calorimetry).…”

Section: Introductionmentioning

confidence: 99%

A Heat-Stimulated Luminous Fiber Using Heat-Sensitive Green TF-G Pigment

Yang

2018

Materials

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In this study, we fabricated a heat-stimulated luminous fiber (HSLF) by wet spinning. The HSLF consists of Sr2ZnSi2O7: Eu2+, Dy3+ (SZSO), Y2O2S: Eu3+, Mg2+, Ti4+ (YOS), and heat-sensitive green TF-G pigment (HSGP). SZSO and YOS serve as a source of luminescence to yield a long afterglow system. HSGP is a heat-stimulating agent which develops the link between luminescence and temperature for HSLF. The luminescence of the HSLF is dull below 30 °C, but vivid above 30 °C. The luminescence of HSLFs can be stimulated by low heat (human body temperature). Emission spectra were recorded at 20 °C and 30 °C to investigate the heat-stimulated luminescent performance of HSLFs. HSLF is a smart material which can discern the exciting light to change color because of the photo-thermal effect. This characteristic provides optimum conditions for SZSO and YOS to store energy. The results demonstrated that most luminescence from SZSO and YOS could be absorbed by HSGP at 20 °C, but the luminescence could be liberated at 30 °C. The heat-stimulated phenomenon could also be verified by afterglow and the naked eye.

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Optical and structural dynamical behavior of Crystal Violet Lactone – Phenolphthalein binary thermochromic systems

Cited by 51 publications

References 37 publications

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

A sultone‐based reversible dark red‐yellow conversion thermochromic colorant with adjustable switching temperature

A Heat-Stimulated Luminous Fiber Using Heat-Sensitive Green TF-G Pigment

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