Effect pigments - Basic lead carbonate & bismuth oxy chloride based pearlescent pigments / Yash Melkeri in PAINTINDIA, Vol. LXVII, N° 8 (08/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 8 (08/2017) . - P. 96-100 Titre : Effect pigments - Basic lead carbonate & bismuth oxy chloride based pearlescent pigments Type de document : texte imprimé Auteurs : Yash Melkeri, Auteur ; Tipanna Melkeri, Auteur Année de publication : 2017 Article en page(s) : P. 96-100 Langues : Anglais (eng) Catégories : Carbonate de plomb Oxychlorure de bismuth Pigments -- Synthèse Pigments à effets spéciaux Pigments nacrés Index. décimale : 667.2 Colorants et pigments Résumé : Effect pigments display a wide range of properties such as colour-travel, reflect or refract light. When substrate used are flat regular, laminar in shape then the effect pigments are mirror type. Basic lead carbonate and bismuth oxy chloride fall under this category. Basic Lead carbonate pigment is obtained by passing carbon dioxide gas in lead acetate solution having luster and brilliance that equals or excels. These pigments are used in textile, plastics, paints, artificial pearls. Lead based pearlescent pigments are having excellent pearlescent effect but considered to be toxic, so banned in most places. Bismuth Oxy chloride (BiOCI) crystals are flat, regular, octahedral in structure. These pigments look smooth microscopic compared to mica coated pearl. Despite higher refractive index (2.15) than basic Lead carbonate, bismuth oxy chloride does not show the brilliance of basic lead carbonate due to its inferior crystal forms. BiOCI is prepared reacting bismuth nitrate in presence of chloride ions with sodium hydroxide. The crystal quality can be adjusted by the chosen reaction parameters, such as bismuth salt concentration, temperature, pH-value, reactor geometry, and addition of surfactants. BiOCI is used in plastics, paints, inks, textiles artificial jewelry, and automotive coatings. The major limitation would be the higher cost and its higher density that makes it settli n application media. Note de contenu : - Basic lead carbonate based pearlescent pigments - Manufacturing of basic lead carbonate pigment - Applications of basic lead carbonate pearlescent pigments - Limitations of basic lead carbonate pearlescent pigments - Manufacturing of bismuth oxy chloride (BiOCl) - Applications of bismuth oxy chloride pearlescent pigment En ligne : https://drive.google.com/file/d/1SrrEwx6UqqTNRHuBdA6qjJrklFfKBqu9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29261 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19294	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis and deposition of bismuth oxychloride with a rose-type flower shape and photoelectroactivity evaluation in the methyl orange discoloration reaction / Marcelo Rodrigues da Silva Pelissari in COLORATION TECHNOLOGY, Vol. 139, N° 6 (12/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 6 (12/2023) . - p. 742-757 Titre : Synthesis and deposition of bismuth oxychloride with a rose-type flower shape and photoelectroactivity evaluation in the methyl orange discoloration reaction Type de document : texte imprimé Auteurs : Marcelo Rodrigues da Silva Pelissari, Auteur ; Luan Pereira Camargo, Auteur ; Fenelon Martinho Lima Pontes, Auteur ; Luiz Henrique Dall'Antonia, Auteur Année de publication : 2023 Article en page(s) : p. 742-757 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composés inorganiques -- Synthèse Conductimétrie Décoloration Orange méthylique Oxychlorure de bismuth Photoélectrochimie Rayonnement ultraviolet Index. décimale : 667.2 Colorants et pigments Résumé : In this work, bismuth oxychloride with a rose-type flower shape was successfully synthesised using the easy and low-cost successive ionic layer adsorption and reaction process. The tetragonal crystalline structure with a flower-like shape and thickness of 150-nm nanosheets was used as electrode material in an exciting approach for the photoelectrochemical discoloration reaction of methyl orange. The structure, morphology and optical properties of the obtained bismuth oxychloride sample were evaluated through X-ray diffraction, Raman spectroscopy, the Brunauer–Emmett–Teller method, diffuse reflectance ultraviolet–visible spectroscopy and scanning electron microscopy. Through photoelectrochemical characterisation measurements (linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopy techniques), the bismuth oxychloride electrode showed remarkable electroactivity under ultraviolet light irradiation. The methyl orange discoloration reaction, performed under ultraviolet light incidence and potential application of −0.5 V (vs silver/silver chloride) for 60 minutes, produced a higher degradation percentage (ca. 82%) and kobs of 29 × 10−3 min−1. Note de contenu : - EXPERIMENTAL : Materials and reagents - Synthesis of bismuth oxychloride powder - Deposition of bismuth oxychloride film - Physical characterisation - Photoelectrochemical measurements - RESULTS AND DISCUSSION : Physical characterisation - Photoelectrochemical characterisation - Evaluation of MO discoloration reaction - Table 1 : Physical parameters obtained by the nitrogen adsorption–desorption process, and band gap energy (Egap) of bismuth oxychloride material - Table 2 : Electrochemical parameters obtained from the fluorine-doped tin oxide/bismuth oxychloride electrode - Table 3 : Kinetics parameters of the MO dye photoelectrocatalytic discoloration reaction (0.1 mmol L−1 in 0.1 mol L−1 Na2SO4), with the FTO/BiOCl electrode, obtained by the SILAR process. Measurements were performed in either the absence or presence of UV light and different applied potentials (vs Ag/AgCl) for 60 minutes DOI : https://doi.org/10.1111/cote.12685 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12685 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40124 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24320	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The liquid metal look / Wei Liu in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4510 (03/2007) . - p. 18-22 Titre : The liquid metal look Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Carolyn Lavallee, Auteur Année de publication : 2007 Article en page(s) : p. 18-22 Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Oxychlorure de bismuth Photostabilité Pigments métalliques Réflectance Index. décimale : 667.2 Colorants et pigments Résumé : Recent advances mean bismuth oxychloride pigment is being used for variety of purposes. This paper looks at its application in coatings. The liquid metal look is essentially a smooth, highly reflective, non-grainy appearance. This is accomplished by using either a continuous film or by using very thin platelets, on the order of 30-50 nanometers, to reduce the scattering of light from edges of platelets. It has been desirable in the automotive industry for some time and is now making an appearance in other coating applications, such as teletronics. This is accomplished by using either a continuous film or by using very thin platelets of a highly reflective pigment. One of the pigments that satisfy these requirements is bismuth oxychloride. This pigment has been better know for applications such as button and costume jewellery coatings, but recent advances make it feasible for less traditional applications as well, such as achieving the liquid metal effect. Bismuth oxychloride is made by the reaction of bismuth nitrate in acid solution with chloride. By suitably controlling pH and temperature, the formation of BiOCl is thermodynamically preferred over Bi2O3, bismuth oxide. With very fine control of these same parameters the crystals grow as very thin patelets. The chemical reaction is as follows : Bi(NO3)3 + H2O + 3NaCl --> BiOCl + 2HCl + 3NaNO3 The resulting platelets are about 90nm thick at the edge and somewhat thicker in the middle. It is the shape of these platelets, along with the index refraction (about 2.0), that is responsible for its pearlescent appearance. Note de contenu : - Bi(NO3)3 + H20 + 3NaCl -> BiOCl + 2HCl + 3NaNO3 - Optical properties vs effect - UV stability - Applications - Applications in coatings - Blended - Test result - UV absorber - TABLE : 1. Physical properties of BiOCl and TiO2 coated mica - 2. L change for BiOCl crystal stabilised by cerium hydroxide in medium shade after 240hr QUV 340 exposure - 3. L* change for BiOCl crystal stabilised by cerium hydroxide and UV absorber in medium shade after 240hr QUV exposure En ligne : https://drive.google.com/file/d/1bguGWEO5jMB1nJugjzoXYUUtA2H_EmKg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27409 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
006367	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)