Wood Surface Energy and Time Dependence of Wettability: A Comparison of Different Wood Surfaces Using an Acid-Base Approach

Gindl, Milojka; Sinn, Gerhard; Reiterer, Alexander; Tschegg, Stefanie

doi:10.1515/hf.2001.071

Cited by 36 publications

(30 citation statements)

References 32 publications

(40 reference statements)

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“…For fresh wood, the critical surface free energy according to the Zisman method (Timmons and Zisman 1968) is systematically 30 to 40% lower than that calculated by the OWRK method (Owens and Wendt 1969). A similar occurrence was observed by Maldas and Kamdem (1998) and Gindl et al (2001a). However, for aged wood, the changes in surface free energy among the Zisman method (Timmons and Zisman 1968), OWRK method (Owens and Wendt 1969), and vOCG method (Van Oss et al 1988) were not evident (Fig.…”

Section: Surface Free Energy Componentssupporting

confidence: 74%

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

et al. 2014

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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.

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Section: Surface Free Energy Componentssupporting

confidence: 74%

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

et al. 2014

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“…Recently, as well as in the past, much research has been undertaken examining differences in wood surface free energy in relation to the properties of porosity and anisotropy. It was found that the species, surface roughness, pH value, and aging time all influenced surface free energy (Cao et al 2005, Gindl et al 2001b, Little et Qin et al (2014. "Wood wettability & machining," BioResources 9(2), 3088-3103.…”

Section: Introductionmentioning

confidence: 99%

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Qin¹,

Gao²,

Zhang³

et al. 2014

BioResources

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The surface free energy and dynamic wettability of wood are important to the performance of its adhesive bonding strength. In this work, the surface free energy of poplar wood samples machined with different processes were calculated by the OWRK (geometric mean) and vOCG (acid-base) methods, and the dynamic wettability of adhesives on wood samples was studied using the S-D wetting model. The results indicate that the contact angles of reference liquids on rotary wood samples were greater than those on planed or sawn wood, and the rotary wood samples were more hydrophobic. The effect of surface roughness on contact angle was insignificant compared with surface structure morphology. The total surface free energy was almost the same for the planed and sawn wood, as calculated by the OWRK and vOCG methods, and the surface free energy of rotary wood samples was lower than that of planed or sawn wood samples. The initial and equilibrium contact angle increased as the viscosity of adhesive increased for all the wood samples, and the contact angles of rotary wood samples were greater than those of planed or sawn wood; however, the K-value was lower. The wettability of the loose side was higher than that of the tight side. Contact angles decreased when surface free energy increased, while the K-value increased.

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“…The wettability of the wood surface is used to determine the weathering mechanism. SFE is a characteristic of wood that depends on species, pH value, surface roughness, and aging time (Gindl, Sinn, Reiterer, & Tschegg, 2001;Gindl & Tschegg, 2002;Little, McConnell, Irby, Shi, & Riggins, 2013). Gérardin, Petrič, Petrissans, Lambert, and Ehrhrardt (2007) have evaluated wood SFE after being treated with heat, and the wettability of the heat-treated wood was strongly affected, causing changes to its behaviour.…”

mentioning

confidence: 99%

Changes to the water repellency and storage of different species of deadwood based on decomposition rate in a temperate climate

et al. 2018

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The aim of this study is to demonstrate the changes to the physical properties and water repellency (WR) of deadwood depending on the species and rate of decomposition. An innovative element of this study is the measurement of droplets' contact angle to the surface of the wood. Five species of trees at three different stages of decomposition were selected for the present study. The deadwood Silver Fir (Abies alba), Common Hornbeam (Carpinus betulus), Common Ash (Fraxinus excelsior), Common Alder (Alnus glutinosa), and Common Aspen (Populus tremula) were selected.The WR of the wood was determined based on water drop penetration time; and the surface free energy (SFE) was determined based on the measured angles. Moreover, Owens-Wendt and Van Oss-Chaudhury-Good models were used to determine SFE. The advancement of deadwood decomposition can be determined by observing the physical changes to the wood. Marked changes in density, moisture, porosity, and weight loss in subsequent stages of degradation were found in the wood of all tested species. Changes to the physical properties of wood result in changes to its WR and wettability. As the degree of decomposition increases, different species of wood may absorb water more quickly, and the surface of the wood may become more hydrophilic. Our results indicate that deadwood increases water storage in forest ecosystems. Assuming that deadwood covers approximately 5.7 m 3 /ha in a Polish forest, total water storage could increase from 0.8 to 4.7 m 3 /ha depending on the wood species and decomposition rate.

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Wood Surface Energy and Time Dependence of Wettability: A Comparison of Different Wood Surfaces Using an Acid-Base Approach

Cited by 36 publications

References 32 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

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Changes to the water repellency and storage of different species of deadwood based on decomposition rate in a temperate climate

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