Contact angle measurement on wood using videotape technique

Kalniņš, Mārtiņš; Katzenberger, C; Schmieding, S.A; Brooks, J.K

doi:10.1016/0021-9797(88)90084-7

Cited by 19 publications

(16 citation statements)

References 1 publication

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“…Kalnins et al [4] suggested the usage of a video-type technique to measure the dynamic contact angle of a liquid on wood. The measurements were conducted at the elapsed time of 3 to 5 s with distilled water as test liquid.…”

Section: Introductionmentioning

confidence: 99%

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Surface free energy of natural and surface-modified tropical and European wood species

Mohammed-Ziegler¹,

Oszlánczi²,

Somfai³

et al. 2004

Journal of Adhesion Science and Technology

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To describe the wetting properties of various wood types from a practical point of view, the surface free energy of six tropical (guava, almond, teak, cloves, mango and neem) and six European wood species (English oak, Norway maple, hazel, ash, alder and Scots pine) were calculated using contact angles by the sessile-drop method. In order to provide water-repellent characteristics to the samples, they were silanized by a less used silylating reagent (using chloroform solution of trimethylsilyl N,N-dimethylcarbamate) and the results were compared with the effect of two commonly used reagents (chloroform solutions of chlorotrimethylsilane and octadecyltrichlorosilane). Since the Lifshitz-van der Waals/acid-base model is widely used in studies of biological surfaces, the energetics of the resultant wood surfaces were quantitatively described in terms of this model. For the mainly hydrophobic wood samples, anomalous surface behaviour (i.e. extremely high water contact angles (130-145 • ) and in certain cases unreasonably low surface free energy values) was found. Since the Lifshitz-van der Waals/acid-base model did not yield numerical results in some cases and the calculated surface free energies depended on the test liquid triplet used, the limitations in the applicability of this model are also discussed. For comparison, we analyzed our data also in terms of the Chang model.

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Section: Introductionmentioning

confidence: 99%

“…Since the work of Kalnins et al [4] numerous investigations have been carried out on wood surfaces. Gardner et al [5] found dynamic contact angle measurements to be useful for monitoring wood processing and environmental conditioning effects on surface energetics.…”

Section: Introductionmentioning

confidence: 99%

Surface free energy of natural and surface-modified tropical and European wood species

Mohammed-Ziegler¹,

Oszlánczi²,

Somfai³

et al. 2004

Journal of Adhesion Science and Technology

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“…Therefore, it was possible to get a freeze frame of the moment directly after finishing the liquid addition. Then the contact angles were measured manually on the video monitor (following Kalnins et al 1988). The MDF were held at 20 ~ during the measuring time.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the wetting characteristics of medium density fibreboards (MDF) by means of contact angle measurements

Wulf

Netuschil

Hora

et al. 1997

Holz als Roh- und Werkstoff

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The influence of some parameters (wood species, binder content, water repellent finish, wood humidity and roughness) on the wetting of MDF was investigated by means of contact angle measurements with selected test liquids (water, glycerol, ethylene glycol and diiodmethane) using the sessile drop method. The investigations show that contact angle measurements are mainly disturbed by the penetration of the liquids into the MDF and by the high roughness of the surface. Therefore, the results have principally qualitative character. They represent the following tendency for the five parameters: the use of water repellent finish, increased wood humidity and increased roughness made wetting less effective with water repellent finish showing by far the biggest effect. MDF made of beech showed predominantly better wetting behaviour than that made of spruce. The influence of the binder content could not be unambiguously ascertained.

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“…The obtained edge generally agrees well with the real water drop image (see Figs. [14][15][16][17] because the most suitable algorithm was selected, and thus, the operator will trust the results. From a business perspective, this feature is beneficial for generalization of the proposed algorithm.…”

Section: B Real Water Drop Imagesmentioning

confidence: 99%

“…With the progress of contact angle measurements, algorithms with increased accuracy have been proposed. [14][15][16][17][18][19] Of these algorithms, the reduced or exact model-based fitting algorithms are popular and provide a significantly broader utility. The fitting-based static contact angle algorithms ina) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

An algorithm for selecting the most accurate protocol for contact angle measurement by drop shape analysis

Zhi-niu

2014

Review of Scientific Instruments

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In this study, an error analysis is performed to study real water drop images and the corresponding numerically generated water drop profiles for three widely used static contact angle algorithms: the circle- and ellipse-fitting algorithms and the axisymmetric drop shape analysis-profile (ADSA-P) algorithm. The results demonstrate the accuracy of the numerically generated drop profiles based on the Laplace equation. A significant number of water drop profiles with different volumes, contact angles, and noise levels are generated, and the influences of the three factors on the accuracies of the three algorithms are systematically investigated. The results reveal that the above-mentioned three algorithms are complementary. In fact, the circle- and ellipse-fitting algorithms show low errors and are highly resistant to noise for water drops with small/medium volumes and contact angles, while for water drop with large volumes and contact angles just the ADSA-P algorithm can meet accuracy requirement. However, this algorithm introduces significant errors in the case of small volumes and contact angles because of its high sensitivity to noise. The critical water drop volumes of the circle- and ellipse-fitting algorithms corresponding to a certain contact angle error are obtained through a significant amount of computation. To improve the precision of the static contact angle measurement, a more accurate algorithm based on a combination of the three algorithms is proposed. Following a systematic investigation, the algorithm selection rule is described in detail, while maintaining the advantages of the three algorithms and overcoming their deficiencies. In general, static contact angles over the entire hydrophobicity range can be accurately evaluated using the proposed algorithm. The ease of erroneous judgment in static contact angle measurements is avoided. The proposed algorithm is validated by a static contact angle evaluation of real and numerically generated water drop images with different hydrophobicity values and volumes.

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Contact angle measurement on wood using videotape technique

Cited by 19 publications

References 1 publication

Surface free energy of natural and surface-modified tropical and European wood species

Surface free energy of natural and surface-modified tropical and European wood species

Investigation of the wetting characteristics of medium density fibreboards (MDF) by means of contact angle measurements

An algorithm for selecting the most accurate protocol for contact angle measurement by drop shape analysis

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