Wettability assessment of finely divided solids

Lazghab, Mariem; Saleh, Khashayar; Pezron, Isabelle; Guigon, Pierre; Komunjer, L.

doi:10.1016/j.powtec.2005.05.014

Cited by 169 publications

(118 citation statements)

References 16 publications

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“…Thus, the dispersed phase significantly increased water sorption, which may be associated with the fillers themselves and also with the quality of the final part and the voids present in the composite. Figure 4 shows images of the equilibrium contact angle obtained in the water droplet spreading test according to [9] where small contact angle indicates that the spread was more pronounced. It can be seen that the contact angle for all samples is less than 90°, consequently the materials can be considered generally hydrophilic.…”

Section: Physical Characterizationmentioning

confidence: 99%

Reuse of waste paper and rice hulls as filler in polymeric matrix composites

et al. 2017

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Concerns for the environment are recurrent in our society, and research on low impact materials such as those produced from waste is an alternative. This work is based on the reuse of scrap paper and rice hulls aiming to increase the life cycle of these waste products and to find better destination. Composites with a volumetric filler content (dispersed phase) of 80% were produced via compression molding using polyurethane (PU) based on castor oil or polyester resin as matrix, in four distinct families: polyester/rice hulls, PU/rice hulls, polyester/paper and PU/paper. The following tests were performed: water sorption, contact angle, hardness, impact and tensile testing. Scanning electron microscopy (SEM) was used for fracture morphology study. Basic visual analysis showed greater void content for the rice hull composites, making them less aesthetically appealing compared to paper. It was observed in the case of PU matrix the filler greatly influenced the rigidity since this pure material was more flexible compared to pure polyester. Filler incorporation decreased tensile strength of the polyester matrix but significantly increased that of the PU matrix.

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Section: Physical Characterizationmentioning

confidence: 99%

Reuse of waste paper and rice hulls as filler in polymeric matrix composites

et al. 2017

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“…The contact angle between the powder samples and distilled water (20°C) was analyzed by the sessile-drop method as described in the literature [12] with the following modifications. First, the biopolymer samples were dissolved in dist.…”

Section: Contact Anglementioning

confidence: 99%

Dynamics of Capillary Wetting of Biopolymer Powders

Wangler

Kohlus

2017

Chem Eng & Technol

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The rehydration behavior of biopolymer powders was investigated. Problems that arise during powder rehydration, e.g., floating and formation of particle aggregates, are mainly attributed to the dynamics of capillary water uptake. Common methods for analysis are too slow to assess the fast changes and do not allow conclusions about causal relationships. For a more detailed understanding, relevant powder properties were investigated. Results show that viscosity development in the rehydration liquid as well as swelling, and in particular their dynamics, are crucial for powder rehydration. The dynamic capillary rise was modeled based on the Washburn equation and results were linked to the physical powder characteristics. The approach allows the evaluation, whether viscosity or swelling effects lead to a critical rehydration behavior.

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“…The third region on the curve in Figure 8 is characterized by a steady state behavior of wetting. A steady contact angle is reached because the cohesive interaction that helps a drop to form the spherical shape is balanced by the adhesive interaction, which is responsible for the spreading of the liquid [31]. The work of adhesion (W A ), which is the work required to separate the solid and liquid decreases in the case of both blends and composites.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Morphology and contact angle studies of poly(styrene-co-acrylonitrile) modified epoxy resin blends and their glass fibre reinforced composites

Hameed¹,

Abraham²,

Thomas³

2007

Express Polym. Lett.

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Abstract. In this study, the surface characteristics of blends and composites of epoxy resin were investigated. Poly(styreneco-acylonitrile) (SAN) was used to modify diglycidyl ether of bisphenol-A (DGEBA) type epoxy resin cured with diamino diphenyl sulfone (DDS) and the modified epoxy resin was used as the matrix for fibre reinforced composites (FRP's). E-glass fibre was used as the fibre reinforcement. The scanning electron micrographs of the fractured surfaces of the blends and composites were analyzed. Morphological analysis revealed different morphologies such as dispersed, cocontinuous and phase-inverted structures for the blends. Contact angle studies were carried out using water and methylene iodide at room temperature. The solid surface energy was calculated using harmonic mean equations. Blending of epoxy resin increases its contact angle. The surface free energy, work of adhesion, interfacial free energy, spreading coefficient and Girifalco-Good's interaction parameter were changed significantly in the case of blends and composites. The incorporation of thermoplastic and glass fibre reduces the wetting and hydrophilicity of epoxy resin.

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Wettability assessment of finely divided solids

Cited by 169 publications

References 16 publications

Reuse of waste paper and rice hulls as filler in polymeric matrix composites

Reuse of waste paper and rice hulls as filler in polymeric matrix composites

Dynamics of Capillary Wetting of Biopolymer Powders

Morphology and contact angle studies of poly(styrene-co-acrylonitrile) modified epoxy resin blends and their glass fibre reinforced composites

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