Wilhelmy Technique and Solidification Front Technique to Study the Wettability of Fibres

Li, S. K.; Smith, Richard P.; Neumann, A. W.

doi:10.1080/00218468408079669

Cited by 31 publications

(6 citation statements)

References 11 publications

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“…Li et al [48] used the Wilhelmy balance method and the solidification front method to determine the surface tension of fibers for predicting the adhesion bond strength between reinforcing fibers (carbon and an aromatic polyamide) and resin. It is suggested that the reproducibility and accuracy of these techniques enable the surface tension of small-diameter fibers to be determined.…”

Section: Wilhelmy Methodsmentioning

confidence: 99%

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Wetting and Wicking in Fibrous Materials

Patnaik¹,

Rengasamy²,

Kothari³

et al. 2006

Textile Progress

191

143

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Section: Wilhelmy Methodsmentioning

confidence: 99%

“…Several workers have studied wettability using this technique [8,15,30,33,[39][40][41][42][43][44][45][46][47][48].…”

Section: Wilhelmy Methodsmentioning

confidence: 99%

Wetting and Wicking in Fibrous Materials

Patnaik¹,

Rengasamy²,

Kothari³

et al. 2006

Textile Progress

191

143

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“…The surface tensions of the various fibreglass substrata were calculated from an equation-ofstate approach (Neumann et al 1974) using the measured contact angle of double-distilled water on an individual fibre. Briefly, the water contact angle on the 10 txm diameter fibre was determined using a modified Wilhelrny balance method (Li et al 1984). When a solid, which is bounded by vertical surfaces is partially immersed in a liquid, the liquid will either rise or be depressed along the vertical wall due to capillary effects, thus exerting a force on the solid.…”

Section: Methodsmentioning

confidence: 99%

Immobilization of cultured Catharanthus roseus cells using a fibreglass substratum

Facchini

DiCosmo

1990

Appl Microbiol Biotechnol

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Cultured C a t h a r a n t h u s roseus cells were immobilized using geometrically identical needled fibreglass mats prepared with a range of surface coatings. The phenyl (PS), polyglycol (PG), aldehyde (CHO), alkyl (CTMS), and silanol (AW) coatings, along with the untreated glass (HC) surface, produced surfaces with a range of surface tensions. The immobilization efficiency of the substratum, measured as the percentage of cells immobilized, increased with increasing substratum surface tension in the order PS < PG < CHO < CTMS < AW < HC. The dependence of immobilization efficiency on substratum surface tension can be described using a thermodynamic model of adhesion that considers the extent of plant cell adhesion to be a function of the surface tensions of the substratum, the suspending liquid, and the plant cells. In addition, this dependence also demonstrates the fundamental role of adhesion in the immobilization process involving a glass fibre matrix. However, cell entrapment processes are also implicated. The untreated glass fibre substratum (HC), which demonstrated the greatest immobilization efficiency, was used for further characterization of the immobilization strategy. Maximum inoculum biomass was determined to be approximately 1.9 g cells (fresh weight)/g substratum (dry weight) to achieve greater than 90% immobilization efficiency. The growth rate of immobilized cultures was slower than suspension cultures, probably due to mass transfer limitations. Production of the indole alkaloids, tryptamine, catharanthine, and ajmalicine, was also suppressed relative to suspension-cultured cells. These results are considered in relation to other immobilization strategies and their apparent effects on cellular processes.

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“…The tensiometric method is similar to those reported elsewhere [12][13][14][15]. The fiber which is suspended vertically from the arm of the electromicrobalance and the other end of which is immersed in liquids; either in the lower liquid (L2), at the interface or in the upper liquid (L1) depending on the level of the liquid surface.…”

Section: Determination Of Surface Free Energymentioning

confidence: 99%

Determination of dispersive and nondispersive components of the surface free energy of glass fibers

Tsutsumi

Abe

1989

Colloid & Polymer Sci

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The dispersive component ya of the surface free energy of glass fibers and its interaction energy with alkanes, benzene, 1-nitropropane, ethyleneglycol, glycerol, formamide, and water were quantitatively determined by the tensiometric method within two liquids. The values of nondispersive interaction energy I~L were found to be a linear function of the square root of the nondispersive component of the surface free energy of liquids. This suggests that the nondispersive interaction energy may be represented by the geometric mean of the nondispersive component of the surface free energy of a solid and a liquid. The slope gave the nondispersive component y~P of the surface free energy. The ya values are 33 and 14 mJ/m 2 for the untreated and aminosilane-treated fibers, respectively, suggesting that organophilic character has developed on the surface after aminosilane treatment. The yP value was almost similar after the treatment, probably because of the polar characteristics of amino groups.

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Wilhelmy Technique and Solidification Front Technique to Study the Wettability of Fibres

Cited by 31 publications

References 11 publications

Wetting and Wicking in Fibrous Materials

Wetting and Wicking in Fibrous Materials

Immobilization of cultured Catharanthus roseus cells using a fibreglass substratum

Determination of dispersive and nondispersive components of the surface free energy of glass fibers

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