Control of temperature changes in daily life with thermochromic green pigments

Civan, Lale; Kurama, Semra; Ayas, Erhan; Mutlu, Yasemin Çimen

doi:10.1016/j.matlet.2020.127846

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…52 The large surface area of these membranes is attributed to the production of huge amount of fibers with diameters in the submicrometer scale, creating ultrasensitive fibers for a wide range of applications. 53 However, the objective of this work was the production of electrospun fibers of CA with the encapsulation of two different commercial pigments with thermochromic (TL) and photochromic (PL) in the CA fibers electrospun with capacity for its use as possible sensors in the packing industries. These pigments are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…As previously mentioned, in this work, the production of nanostructured films by electrospinning technique has taken more relevance in the production of nanostructured membranes to be used as sensors 52 . The large surface area of these membranes is attributed to the production of huge amount of fibers with diameters in the submicrometer scale, creating ultrasensitive fibers for a wide range of applications 53 …”

Section: Resultsmentioning

confidence: 99%

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Thermochromic and/or photochromic properties of electrospun cellulose acetate microfibers for application as sensors in smart packing

Mancipe

Nista

Caballero

et al. 2020

J of Applied Polymer Sci

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There is growing demand for smart materials whose chemical structure, shape, and/or color, among other properties could be modified for use in applied packaging in the food industry, pharmacy, textiles, and so forth. These variations results from external stimuli, whether chemical, physical, and/or environmental (humidity, heat, light, and so forth), which has created promising materials for use in various areas of engineering, such as the production of ultrasensitive sensors with the capacity that the said variations are perceptible to the naked eye. The production of nanostructured sensor membranes obtained by electrospinning is one interesting alternative that has been attracting the attention of researchers in recent years. However, many studies related to the application of photosensors supported in electrospun cellulose acetate (CA) have not been found in the literature. Among the most used materials in electrospinning, CA stands out due to its wide availability and low cost that reflects in several applications. Two commercial sensitive pigments were used, a thermosensitive and a photosensitive one, in concentrations between 0 and 10% (m/v), to evaluate the best amount in the nanosensors they could be seen through naked eye. Variation on the fibers morphology was characterized by scanning electron microscopy. The stability and thermal transitions were evaluated using thermogravimetric analysis/differential thermogravimetric analysis and differential scanning calorimetry. The composition of chemical fibers was studied using FTIR-ATR. Finally, the thermal and/or UV light response was performed by qualitative test.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermochromic and/or photochromic properties of electrospun cellulose acetate microfibers for application as sensors in smart packing

Mancipe

Nista

Caballero

et al. 2020

J of Applied Polymer Sci

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“…[16][17][18] In general, thermochromic materials are appealing, because they can be used as temperature indicators for building, chemical reactors, and anti-reflective mirrors. [19] Pigments that can induce color change by the oxidation-reduction mechanism are widely incorporated into fabrics and molded plastics to create thermochromic materials. [20][21][22] We used this approach in stretchable (600% elongation at break) and soft (Young's modulus of 0.18 MPa) silicone to create thermochromic elastic hollow fibers.…”

Section: Introductionmentioning

confidence: 99%

Ultrastretchable Thermo‐ and Mechanochromic Fiber with Healable Metallic Conductivity

Sin

Singh

Bhuyan

et al. 2021

Adv Elect Materials

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This work demonstrates a facile way to fabricate ultrastretchable thermo‐ and mechanochromic fiber with healable metallic conductivity. Thermochromic hollow elastic fiber is prepared by using silicone composite with thermochromic pigment. Once the fiber forms, gallium‐based liquid metal is injected into the fiber. The composite fiber with liquid metal core shows uniform color change along the fiber by applying Joule heating through the liquid metal wire. The fiber with multiple thermochromic pigment locally distributed along the fiber shows serial color change by increased current. The healable conductivity of the metal core is demonstrated by restoring electrical conductivity near room temperature. When it is in a solid state, the wire can fracture during deformation, thus the wire loses conductivity. However, upon body heating, the wire can rewire, because of the low melting point of the metal (gallium, 29.8 °C). This healing ability of the metal core can allow the fiber to have healable thermochromic behavior. Stretching a liquid metal wire can change the geometry of the wires, resulting in a color change because of increased resistance while Joule heating is applied. This thermo‐ and mechanochromic fiber with liquid metal core would find use in wearable and conformal electronics, electronic textiles, and soft robotics.

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“…Thermochromic materials are the substance that can reversibly change color according to the change in ambient temperature, and that temperature is referred as transition temperature. [16,17] When the ambient temperature is below the transition temperature, the materials appear dark color and can absorb more solar energy, whereas above the transition temperature, the materials exhibit light color and has higher solar reflectance. Perez et al [18] developed a reversible thermochromic mortar by adding thermochromic pigments (TPs) to white Portland cement.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Properties of Thermochromic Superhydrophobic Coatings

et al. 2021

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Herein, thermochromic superhydrophobic coatings (TSCs) with different colors are prepared, and their surface wettabilities and optical properties are studied. The TSC coating maintains its surface superhydrophobicity even after a series of mechanical damage (sandpaper abrasion, gravel impact, and knife scratching), chemical corrosion, ultraviolet aging, and environmental temperature changes. Contaminants on the surface of the coating sre easily washed by water droplets. The TSC has a reversible color function with a critical discoloration temperature (T c ) approximately in the range 28-31 C. In winter, the ambient temperature (T a ) is lower than T c , and the TSC is dark and absorbs more solar energy. Although in summer, T a > T a , the TSC is light and reflects more solar energy. The sunlight exposure test shows that the surface temperature of the thermochromic pigment/polydimethylsiloxane (TP/PDMS) coating in winter is only 0.9 C lower than that of the carbon black/PDMS (CB/PDMS) coating, whereas in summer, the surface temperature of the TP/PDMS coating is only 6.2 C higher than that of TiO 2 /PDMS coating. Energy consumption simulation results show that the TP/PDMS coating decreases the total annual energy consumption in North China by 13.74% compared with the traditional white cooling coating.

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Control of temperature changes in daily life with thermochromic green pigments

Cited by 10 publications

References 6 publications

Thermochromic and/or photochromic properties of electrospun cellulose acetate microfibers for application as sensors in smart packing

Thermochromic and/or photochromic properties of electrospun cellulose acetate microfibers for application as sensors in smart packing

Ultrastretchable Thermo‐ and Mechanochromic Fiber with Healable Metallic Conductivity

Fabrication and Properties of Thermochromic Superhydrophobic Coatings

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