An overview of the science and art of encapsulated pigments : Preparation, performance and application / Benjamin Tawiah in COLORATION TECHNOLOGY, Vol. 138, N° 3 (06/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 3 (06/2022) . - p. 224-247 Titre : An overview of the science and art of encapsulated pigments : Preparation, performance and application Type de document : texte imprimé Auteurs : Benjamin Tawiah, Auteur ; Benjamin K. Asinyo, Auteur ; Charles Frimpong, Auteur ; Ebenezer K. Howard, Auteur ; Raphael K. Seidu, Auteur Année de publication : 2022 Article en page(s) : p. 224-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Complexation (chimie) Couches minces multicouches Dispersions et suspensions Encapsulation Essais (technologie) Evaluation Pigments Polymérisation Séparation de phases Sol-gel, Procédé Index. décimale : 667.2 Colorants et pigments Résumé : A successfully encapsulated pigment requires dispersants, pigment and a dispersion medium to build a thin layer of polymer over individual pigment particles. The stability of encapsulated dispersion is aided by the absorption of stabilising molecules on the surface. The stabilising molecules function by steric hindrance or Coulomb-repulsion forces, which prevent the encapsulated pigments from advancing too close to each other for attractive forces to cause agglomeration. Unlike flocculation, agglomeration results in a cementitious network structure that is not easily redispersed by shear forces, hence the need for effective dispersion of encapsulated pigment intended for engineering applications. Besides dispersion forces, the quality of pigment dispersion, the pigment particle size, pigment density, viscosity of the dispersion, and the method of producing the pigment microcapsules, also affect the efficiency and the quality of encapsulated pigment dispersions. This article, therefore, provides up-to-date information on the various pigment encapsulation methods (with specific emphasis on phase separation, in situ polymerisation, emulsion and mini-emulsion polymerisation, the sol-gel method, inclusion complexation and layer-by-layer assembly), and also reviews the performance, the evaluation/test methods and applications of encapsulated pigments. This review provides important insight into the science and art of encapsulated pigment preparation for pigment dispersion technologists, researchers and consumers of pigment products in different fields of endeavour. Note de contenu : - METHODS OF ENCAPSULATION : Preparation of encapsulated pigment dispersion - Physico-chemical methods - Chemical methods - INCLUSION COMPLEXATION - PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSIONS : Stability - Rheological behavior - COLOUR PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSION - EVALUATION METHODS FOR ENCAPSULATED PIGMENT DISPERSION - APPLICATIONS OF ENCAPSULATED PIGMENT DISPERSION : Emerging applications of encapsulated pigments - Table 1 : Encapsulation methods suitable for different ranges of capsule size - Table 2 : Selected studies in in situ polymerisation - Table 3 : Advantages and limitations of some conventional encapsulation methods applicable different types of pigments - Table 4 : Test methods for evaluating encapsulated pigment dispersion - Table 5 : Application of encapsulated pigments DOI : https://doi.org/10.1111/cote.12597 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12597 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37853 [article]

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