Dynamic wettability of wood

Gardner, Douglas J.; Generalla, Necitas C.; Gunnells, David W.; Wolcott, Michael P.

doi:10.1021/la00059a017

Cited by 135 publications

(96 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is not surprising that fresh wood surfaces are more easily wetted by water than the aged wood samples, as consistently found in the literature (Gardner et al 1991. Figure 2 shows that the contact angle trend for aged wood surfaces was opposite that of the fresh wood surfaces; the contact angle increased as the surface roughness decreased.…”

Section: Morphology and Contact Anglesupporting

confidence: 78%

“…Additionally, it has a great influence on the bonding strength of wood composites. These characteristics have been studied recently and in the past (Gardner et al 1991;Liptakova et al 1995;Liu et al 1998;de Meijer et al 2000;Wålinder and Strom 2001;Gindl and Tschegg 2002). Contact angle is the most commonly applied method to calculate surface free energy data for solids using various reference liquids, with several different approaches (Fowkes and Mostafa 1978;Liptakova and Kudela 1994;Gindl et al 2001a,b).…”

Section: Introductionmentioning

confidence: 99%

“…Wood can be viewed as a porous, heterogeneous, complex material comprised of cellulose, hemicellulose, lignin, and extractives, and these polymeric compounds are arranged in a cellular structure resulting in surface roughness on a microscopic scale (Gardner et al 1991), so the equilibrium contact angle of liquid on the wood surface is hard to determine. There are two major effects, Wenzel showed an equilibrium effect of fine-scale roughness; the Wenzel equation shows how the presence of fine-scale roughness tends to amplify differences in contact angle relative to 90-degree angles (Huh and Mason 1977).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

et al. 2014

View full text Add to dashboard Cite

The sanding process influences the surface morphology and chemical components of wood, which are two important factors that influence the surface free energy and wettability of wood. The objective of this study was to investigate the roughness of sanded poplar wood and the effects of sanding and aging on the surface free energy using different methods. The roughness parameter (Ra) decreased as the grit number increased, but no change was evident when the grit number increased from 120 to 240. The contact angle of water on the fresh wood samples decreased as the grit number increased. Fresh wood samples were more easily wetted by water than was the aged wood sample, and the contact angles increased as the surface roughness decreased. The surface free energy of sanded, aged wood obtained by the Zisman method may be unsuitable. For the fresh wood samples, the change of surface free energy and its components were not significantly changed when the grit number was higher than 120; for the aged wood samples, the dispersion component appeared to increase slightly as the grit number decreased. The effect of roughness on the acid/base component, acid component, and base component calculated by the vOCG method was unremarkable. The surface free energy of the wood samples (obtained using the liquid parameters provided by Volpe and Siboni (1997)) can effectively balance the relationship between the acid and base components.

show abstract

Section: Morphology and Contact Anglesupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The contact angles for distilled water were higher after heat treatment compared to the control specimens, an increase from 49.74° for untreated bamboo to 104.01° for bamboo treated at 180 °C. A higher contact angle indicates lower surface wettability (Gardner et al 1991;Du et al 2007). Results thus suggest that heat treatment at 100 to 180 °C actually decreased the wettability of the bamboo surface.…”

Section: Contact Angle Changesmentioning

confidence: 81%

“…Advancing contact angles were determined by the Wilhelmy method according to previously reported procedures (Gardner et al 1991;Wålinder and Johansson 2001;Pétrissans et al 2003). The sessile drop technique, which is commonly used to observe the profile of a drop deposited on the surface of a solid, was employed to estimate the apparent contact angle of distilled water, diiodomethane, and formamide on both control and heattreated bamboo specimens.…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Changes in Surface Properties of Heat-Treated Phyllostachys pubescens Bamboo

Zhang¹,

Yu²

2015

BioResources

View full text Add to dashboard Cite

The wetting phenomena and surface energetic behavior in heat-treated bamboo were studied. The bamboo specimens were heat-treated at temperatures of 100, 140, and 180 °C for 4 h, and an untreated sample served as a control. The sessile drop technique was used to estimate the surface contact angles of the control and heat-treated bamboo samples. The contact angle data were then used to determine the surface free energies using the Lifshitz-van der Waals/acid-based approach. The results revealed that the heat treatment process affects surface wettability. Heat treatment at 100 to 180 °C increased the contact angle of distilled water and formamide, but heat treatment did not cause any increase in the contact angle of diiodomethane. The hydrophobic characteristics of the bamboo surfaces also increased under heat treatment, and the surface free energy and the polarity of the bamboo decreased. Surface analysis by XPS of the samples heat-treated at 180 °C showed a decreased O/C ratio and increased C1 peak, indicating that more lignin and extractives were situated on the bamboo surface. Changes in wettability can greatly impact the use of the material, particularly with respect to the adhesion of paints and coatings.

show abstract

Adhesion Mechanisms of Durable Wood Adhesive Bonds

Gardner¹

2006

Characterization of the Cellulosic Cell Wall

Self Cite

View full text Add to dashboard Cite

This chapter presents and discusses the current state of the art regarding adhesion mechanisms in characterizing durable adhesive bonds for wood composites. Particular emphasis is placed on phenol-formaldehyde (PF) and polymeric methylene diphenyl diisocyanate (pMDI) adhesives. An overview of current adhesion mechanisms is presented with an emphasis on categorizing adhesion mechanisms relative to length scale. Characteristics of wood relative to bonding considerations are reviewed, and probable mechanisms for producing durable wood adhesive bonds are discussed.

show abstract

Dynamic wettability of wood

Cited by 135 publications

References 0 publications

Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

Changes in Surface Properties of Heat-Treated Phyllostachys pubescens Bamboo

Adhesion Mechanisms of Durable Wood Adhesive Bonds

Contact Info

Product

Resources

About