Wetting and rheological characteristics of hydrophobic organic pigments in water in the presence of non-ionic surfactants
Küçük Resim Yok
Tarih
2014
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Wettability and rheological characteristics of highly hydrophobic organic pigments were determined in the absence and presence of surfactants. Two widely used pigments, carbon black (CB) and copper phthalocyanine blue (CuPc), were selected as model pigments. As wetting and dispersing agents, a range of non-ionic nonylphenol ethoxylated (NPE) surfactants with varying hydrophilic chain length was used in the tests. Wetting properties of the pigment powders were investigated by the contact angle measurements based on capillary rise method. Rheology experiments were carried out by a controlled shear stress rheometer. Rheological properties of pigment suspensions were determined by applying common rheologi cal models to shear stress (iota) versus shear rate (gamma) plots. The experimental results demonstrated that, highly ethoxylated surfactants were more efficient than less ethoxylated surfactants in reducing contact angle of pigment powders. Finally, it was inferred that CB and CuPc suspensions behaved virtually as Bingham plastic and shear thickening (dilatant) type suspensions, respectively. (C) 2014 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Pigments, Phthalocyanine blue, Carbon black, Wetting, Rheology, Non-ionic surfactants
Kaynak
Colloids and Surfaces A-Physicochemical and Engineering Aspects
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
455
