Ventolà L, Ramírez M, Calvet T, Solans X, Cuevas-Diarte MA, Negrier P, Mondieig D, Miltenburg JC, Oonk HAJ. J Mater Sci Lett. They are much larger than pigments in con-ventional inks. The applied 1-dodecanol solvent shows β crystalline, α solid (rotator) and liquid phases. Please choose whether or not you want other users to be able to see on your profile that this library is a favorite of yours. Chem Commun. https://doi.org/10.1007/s10973-016-5670-9, DOI: https://doi.org/10.1007/s10973-016-5670-9, Over 10 million scientific documents at your fingertips, Not logged in 1998;8:2677–83. The term Leuco, meaning white and was applied to the reduced form of vat dyes. Colourage, March 1998, # Chemistry and applications of leuco dyes\n. 5,920 Views. Some features of WorldCat will not be available. Review of Progress in Coloration and Related Topics. suppliers.
The aim of presented paper was to prepare and characterise multifunctional thermochromic-fluorescent pigments with potential application in anti-counterfeiting patterns in security printing. The colorimetric properties of three commercial reversible leuco dyes‐based thermochromic pigments (TPs) with activation temperature at 38, 50, and 60°C were studied. Zhu CF, Wu AB. Oxazine. Leuco Dye products can be found in wide variety of forms. A simple route to intrinsically thermochromic fluorans. The benzyl 4-hydroxybenzoate developer causes opposite effects and prevents the appearance of the α phase. 2003;22:881–4. hysteresis. If these envelopes are damaged, the dynamic colour is irreversibly lost. Google Scholar. They have no affinity to textiles but can be applied to cellulose or protein fibers when they have been mordented previously with metallic salt. Determination of the stoichiometry of a thermochromic color complex via Job’s method. color values in dependence on temperature describe hysteresis loops. They have direct affinity to cellulosic fiber. Many commercial products change color with a change of temperature. The activation temperature, which is the only parameter given by the producer to describe the change of color, does not reveal any characteristic properties of this temperature dependent color loop. Synthesis and Properties of Phthalide-Type Color Formers-- I.J. xanthane. The colour of the inks was dependent on temperature as well as the thermal history of the sample, which gives rise … New York: Plenum Press; 1997. p. 1–45. The irregular particles are non-encapsulated composite. Responsibility: 2012;48:750–2. bath toys, swimming pool toys, battery testers etc. MacLaren DC, White MA. The rotator phases of neat and hydrated 1-alcohols. This paper aims at discussing general aspects of thermochromic inks, dynamic colorimetric properties of leuco dye-based thermochromic inks, their stability and principle of variable-temperature colour measurement. Spiropyran Leuco Dyes -- 2. Google Scholar. The largest colour difference achieved for the same sample that arose because of different thermal history and temperature were determined. 2003;13:1701–4. | Applications In: Shanda J, editor.
Spiropyran Leuco Dyes --2. Another example of a leuco dye is the crystal violet lactone, which in its lactone form is colorless or slightly yellowish, but in low pH, when it is protonated, it becomes intensely violet. Azizian F, Field AJ, Heron BM, Kilner C. Intrinsically thermochromic fluorans. The relationship between thermochromic behavior and competing dye-developer and developer-solvent interactions leads us to the first design rules for reversible thermochromic mixtures based on intermolecular interactions. J Mater Chem. 2005;425:7–12. Investigation of lipid-water system. Examples: security printing, novelty The effect is described by colour hysteresis. Join ResearchGate to find the people and research you need to help your work. The orientation of aluminium flakes in powder coatings has been studied. © 2008-2020 ResearchGate GmbH. Leuco Dyes are shortened by: Leuco Dyes change color when get heated and when cooled, they again Luthern J, Peredes A. Leuco Quinone Dyes --3. chemists.
The concentration of 2.3 × 10–5 grams of fluorescent dye per one gram of polymer is sufficient for detection of fluorescence of modified polymeric shell. Control of thermochromic behaviour in crystal violet lactone (CVL)/alkyl gallate/alcohol ternary mixtures. The Chemistry of Leuco Triarylmethanes -- 6. Data for papers are represented by squares at 0 g/m 2. Responsibility: edited by Ramaiah Muthyala. Temperature dependences of reflectance at characteristic wavelength [14,[16][17][18], optical density [15,[19][20][21][22], L*a*b* coordinates [5][6][7][8], Thermochromic printing inks change their colour regarding the change in tem-perature and they are one of the major groups of colour-changing inks. The Chemistry of Fluoran Leuco Dyes -- 7. Color trajectories in the (a*,b*) plane of CIEAB color space as obtained for three TC samples: TCXn-31 (black), TCXb-31 (blue) and CTIr-31 (red) at heating (full signs) and cooling (open signs). 2013;99:432–9.
Leuco dye–developer–solvent composites with thermochromic properties were studied. 1964;20:629–66. Substantivity. Covering leuco dye classes that exhibit reasonable stability, the book discusses photochromic materials that have wide-ranging applications in memory technology, leuco dyes for color photography, and a special class of dyes formulated by reduction instead of the oxidation process. The latter gives rise to concomitant decolourisation. Colorimetry; understanding the CIE system. 2. It was found that both exposure to light and heating to high temperatures degrade the dynamic properties of thermochromic inks; however, they have different effects on the colour hysteresis. The applied 1-dodecanol solvent shows β crystalline, α solid (rotator) and liquid phases. 1959;37:281–93. | Pigments Dye–developer interactions, including complex formation, have been examined in our previous study. Data for, gloss, label, matt and metal papers, respectively. Kulčar R, Friškovec M, Hauptman N, Vesel A, Klanjšek Gunde M. Colorimetric properties of reversible thermochromic printing inks. 2015;120:279–87. Thermochromic polymers will play an extremely important role in the next future. Access scientific knowledge from anywhere.
Thermochromic printing inks change their colour regarding the change in tem-perature and they are one of the major groups of colour-changing inks. Hatano Y. J Mater Sci Lett. They are usually applied at cotton for cheaper shades, have high wet fastness but poor light Fastness. Synthesis and Properties of Phthalide-Type Color Formers --5. The E-mail Address(es) you entered is(are) not in a valid format. Synthesis and Properties of Phthalide-Type Color Formers I.J. Azizian F, Field AJ, Heron BM. The polymer envelopes of pigment capsules are more stable against oxidation than the binder. Reactive dyes: These types of dyes and their properties are directly combines with cellulose by chemical bonding i.e. Sulphur dyes: These types of dyes and their properties are complex organic compounds containing sulphur. | Buyers If these envelopes are damaged, the dynamic colour is irreversibly lost. The thermal properties were related to the temperature-dependent colour. The scattering of infrared light shows that longer bonding times give coatings in which the flakes are distributed more uniformly, parallel to the coating surface. Details of this change and the width of the temperature region required for it are characteristic properties of a selected ink.
The Chemistry of Fluoran Leuco Dyes --7.
Dyes | Pigments Thermochim Acta. The E-mail message field is required. combination of chemicals; their functioning is different from other dyes.
Zuo J, Li W, Weng L. Thermal performance of caprylic acid/1-dodecanol eutectic mixture as phase change material (PCM).
Leuco Dyes require a special system i.e. The Chemistry of Tetrazolium Salts-- D.S. The results of a systematic study of the influence of the color developer and the solvent on thermochromic properties of a reversible thermochromic system—crystal violet lactone as dye; propyl gallate, octyl gallate or lauryl gallate as developer; 1-tetradecanol, 1-hexadecanol or 1-octadecanol as solvent—are presented. Effect of water on the polymorphism of long chain alcohols and acids. Dyes Pigment. The colorimetric properties of three, leuco dye-based thermochromic inks at 31 °C activation temperature were studied. 2010;86:271–7. Fletcher, R. Zink. Daniel.
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Special attention was given to the character-ization of colour hysteresis and the meaning of activation temperature. Acid dyes: Chemically acid dyes belong to various subclasses such as nitro.nitroso, monoazo.