A Study of the Measurement of Surface and Interfacial Tension by the Maximum Liquid Drop Volume Method

Pu, Bingyin; Chen, Donghao

doi:10.1006/jcis.2000.7346

Cited by 9 publications

(10 citation statements)

References 6 publications

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“…It can be seen that the correction factors varied from 0.73-0.83 and corresponded to a range from 0.13-0.3 of dimensionless parameters. The plotted curve best fit into a polynomial equation and was in agreement with the works by various authors (Lando & Oakley, 1967;Wilkinson & Kidwell, 1971;Skelland & Slaymaker, 1990;Pu & Chen, 2001). It should be noted that the correction factors were calculated based on the assumption that the drop size residues govern the same contact angle with the tip as that of the drops related to the maximum volume that could be supported by the tip itself.…”

Section: Drop Weight Analysissupporting

confidence: 84%

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Preparation and Characterization of Alginate Beads by Drop Weight

Kamaruddin¹,

Yusoff²,

Aziz³

2014

IJTech

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The preparation and characterization of macro alginate beads are always associated with appropriate techniques involving precise measurement of shape, size, volume and density of the products. Depending on the type of application, encapsulation of macro alginate beads can be accomplished by various techniques including chemical, ionotropic, physical and mechanical methods. This work describes a method for preparing macro alginate beads through drop weight. The macro beads (2.85-3.85 mm) were prepared via different concentrations of alginate (0.5, 1.0, 1.5 and 2.0 g/L), dripping tip size (0.04-0.14 cm) and immersion into a predetermined concentration of calcium chloride (CaCl 2 ) bath. A custom made dripping vessel fabricated from acrylic plastic, connected to an adjustable dripping clamp was used to simulate the dripping process of the molten alginate at different tip sizes. It was observed that at different dripping tips, the correction factor for the alginate slurry was found in the range of 0.73-0.83. Meanwhile, the lost factor, K LF was observed at 0.93-2.3 and the shrinkage factors were limited to 2.00% from the overall distributed data. It was concluded that liquid properties had no effect on the liquid lost factor. The bead size prediction for different concentrations of alginate solution was compared to the experimental data. Subsequently, it was concluded that increasing the tip size caused the bead size to deviate almost 20% when compared to the experimental and predicted values, respectively.

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Section: Drop Weight Analysissupporting

confidence: 84%

“…Previous works on techniques for generating alginate beads have been studied by various researchers (Daemi & Barikani, 2012;Pu & Chen, 2001;Seifert & Phillips, 1997;Klokk & Melvik, 2002). Conventional techniques to produce round type alginate macro beads can be accomplished by using the dripping technique.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Alginate Beads by Drop Weight

Kamaruddin¹,

Yusoff²,

Aziz³

2014

IJTech

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“…They found excellent agreement of φ for different liquids and capillary materials-an important finding concerning the applicability of the falling-drop method for surface tension measurements. Moreover, no apparent viscosity effect could be measured (40). Experimental data (54,55) and a recommended numerical fit (56) of φ versus the dimensionless fraction q defined by…”

Section: Drop-volume Methods Of Surface Tension Determinationmentioning

confidence: 99%

“…The maximum drop-volume tensiometer therefore is a valuable instrument, free of any correction factors. Its experimental realization has been thoroughly discussed by Gunde et al (39) and by Pu and Chen (37,40). The drop grows along the thick dotted curves, following the direction given by arrows, up to the critical drop (marked with "c") whose shape is drawn in D. The thin curves beyond the critical point refer to numerical solutions with no physical significance.…”

Section: Drop Volumementioning

confidence: 95%

Axisymmetric Liquid Hanging Drops

Latychevskaia¹,

Meister²

2006

J. Chem. Educ.

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The formation of liquid drops delivered from a circular capillary has found application in drop-volume tensiometers ranging from the early stalagmometer to more recent computer-controlled instruments. Although the phenomenon of drop formation can be observed daily, it is rarely discussed in detail in physics or chemistry teaching courses. The aim of this work is to provide an understanding about the buildup of axially symmetric hanging drops, starting from the Young–Laplace equation and the governing differential equation. Drop shapes that are common for all liquids and capillary dimensions are obtained by numerical integration of the dimensionless differential equation. The growing of drops is discussed in terms of changing geometrical quantities such as drop volume, height, surface area, and contact angle to the capillary. A diagram is presented that shows the existence of three different drop shape types at respective values of capillary size and relative drop volume. Accurate geometrical properties are presented for the drop with maximum height and that with maximum volume and diameter. The historical hypothesis of Lohnstein, who suggested a method to calculate the ratio of the critical hanging volume to the falling volume in the drop separation process, is evaluated. Finally, critical volumes are shown as a function of capillary size and compared with falling and residual volumes that have been calculated using a recommended correction function.

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“…[15], while those for silicone oil (c vdW L ¼ 20:7 mJ=m 2 , and c AE L ¼ 0 because it is nonpolar) were taken from Ref. [23]. The results in Table 4 quantify the hydrophilic (hydrophobic) character of the MagSilica 50-85 (50-H8) particles, and there is indication that it is the electron-donor component, c À S , mainly responsible for the wettability differences between the two samples.…”

Section: Thermodynamic Characterizationmentioning

confidence: 99%