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

Mohammed-Ziegler, Ildikó; Oszlánczi, Ágnes; Somfai, Barbara; Hórvölgyi, Zoltán; Pászli, István; Holmgren, Allan; Forsling, Willis

doi:10.1163/156856104839338

Cited by 57 publications

(25 citation statements)

References 59 publications

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“…It is clear that the magnitude of the adhesion between the spatula and the surface depends not only on the scale of the contact area but also on the location of the annular zone. 49.38 (Wu et al 1994) Material of the surface Concrete 70 (Tasdemir et al 1998) 0.03 (Ay and Topcu 1995) 0.2 (Tasdemir et al 1998) 60 (Oliva et al 2002) SiO 2 72 (Petersen 1982) 5.9 (Petersen 1982) 0.19 (Sitti and Fearing 2003) 160 (Sitti and Fearing 2003) Glass 72 (Shackelford and Alexander 2001) 4.9 (Shackelford and Alexander 2001) 0.166 (Shackelford and Alexander 2001) 49.64 (Wu et al 1994) Wood (Pine) 12 (Panshin and DeZeeuw 1980) 0.029 (Panshin and DeZeeuw 1980) 0.3 (Panshin and DeZeeuw 1980) 58.5 (Mohammed-Ziegler et al 2004) hierarchies in achieving robust and releasable adhesion. At the lowest level of the hierarchical structure (the fi ber radius is 70 nm), the adhesion was found to be 308 nN.…”

Section: Resultsmentioning

confidence: 99%

The effect of contaminants on the adhesion of the spatulae of a gecko

Jeng

Mao

2010

J Biosci

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Many researchers have reported that the robust adhesion that enables geckos to move quickly and securely across a range of vertical and horizontal surfaces is provided by the hierarchical structure of their feet (i.e. lamellae, setae, spatulae, etc.). Maintaining this robust adhesion requires an intimate contact between the terminal tips of the spatulae and the surface. The aim of this study was to investigate the effect on the adhesive properties of the spatulae when a particle becomes trapped at the contact surface. Using the Johnson, Kendall and Roberts (JKR) theory, a model was constructed to assist in the analysis of the interactions between the spatula tip, the particle and the surface. The results showed that the keratin (the natural material of the spatula) provides a robust system for adhesion even when there is a particle in the contact area, and the effective contact area of spatulae will be 80%. When the particle is significantly harder than the surface, the adhesion properties of the contact surface influenced by the particle will be more obvious. The results also reveal that the generated adhesion is considerably higher when the spatula is in contact with a softer surface, such as wood or concrete, rather than a hard surface, such as glass or SiO2.

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Section: Resultsmentioning

confidence: 99%

The effect of contaminants on the adhesion of the spatulae of a gecko

Jeng

Mao

2010

J Biosci

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“…2013, Mohammed-Ziegler et al 2004). Gardner et al studied the dynamic wetting behavior of different wood species using the dynamic contact angle method and studied and compared the methods for calculating surface free energy as well (Gardner et al 1991;Wålinder and Gardner 2002).…”

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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“…References for the Data Given in Table 1 Picea abies (Kramer et al 1988;Hasler et al 1994;Boehme and Hora 1996;Mantanis and Young 1997;Nurmi 1997;Bergh et al 1999;Nussbaum 1999;de Meijer et al 2000;Lässig and Močalov 2000;Balode et al 2002;Schulze et al 2002;Matthews and Mackie 2006;Rutz et al 2006;Kaltschmitt et al 2009;Sernek et al 2010;Günther et al 2012;Karl 2012;Navi and Sandberg 2012;EngineeringToolBox 2013) Pinus sylvestris (Bray 1963;Kramer et al 1988;Hasler et al 1994;Wilén et al 1996;Nurmi 1997;Nussbaum 1999;Lässig and Močalov 2000;Schulze et al 2002;Xiao et al 2003;Mohammed-Ziegler et al 2004;Kaltschmitt et al 2009;Karl 2012;Navi and Sandberg 2012;Sedighi et al 2012) Abies alba (Bray 1963;Kramer et al 1988;Becker 1989;de Meijer et al 2000;Lässig and Močalov 2000;Schulze et al 2002;Macias et al 2006;Matthews and Mackie 2006;Wagenführ 2007;…”

Section: Methodsunclassified

“…(Wilén et al 1996;Labrecque et al 1997;Bungart et al 2000;Diamantidis and Koukios 2000;Lässig and Močalov 2000;Barsoum 2001;Deiller et al 2001;Rutz et al 2006;Wagenführ 2007;Wilkinson et al 2007;Bridgeman et al 2008;Woods 2008;Kaltschmitt et al 2009;Kord and Kord 2011;Buček et al 2012;Karampinis et al 2012;Karl 2012;EngineeringToolBox 2013) Fraxinus excelsior (Bray 1963;Kramer et al 1988;Neirynck et al 2000;Deiller et al 2001;Mohammed-Ziegler et al 2004;Ritter et al 2005;Matthews and Mackie 2006;Petritan et al 2007;Wagenführ 2007;Kaltschmitt et al 2009;Vitasse et al 2009;Kiaei and Samariha 2011;Karl 2012) Fagus sylvatica (Bray 1963;Kramer et al 1988;Hasler et al 1994;Boehme and Hora 1996;Neirynck et al 2000;Helle and Schleser 2004;Ritter et al 2005;Petritan et al 2007;Wagenführ 2007;Kaltschmitt et al 2009;Vitasse et al 2009;Karl 2012 Ac...…”

Section: Methodsunclassified

Evaluating the Competition of Lignocellulose Raw Materials for their Use in Particleboard Production, Thermal Energy Recovery, and Pulp- and Papermaking

Trischler¹,

Sandberg²,

Thörnqvist³

2014

BioResources

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There is increasing competition for raw materials between particleboard production, thermal energy recovery, and pulp-and papermaking. According to different scenarios, the consumption of lignocellulosic raw materials is increasing, which means that the competition is increasing. The primary production of lignocellulosic raw material in some regions may therefore reach the limit of sustainability; i.e., the lignocellulosic raw material must be used more efficiently to reduce the risk of a shortage. The physical and chemical properties of the lignocellulosic raw material of selected species have therefore been surveyed, and the raw material properties that are important for each of the three competitors have been defined. The aim of the study is to characterise the lignocellulosic raw materials according to the three competing users and to show whether they are high or low in competition. As methods, a relative ranking of the species regarding their raw material properties and regarding the requirements of the competitors as well as cluster analysis were chosen. The results show that the most favourable raw materials are from coniferous species, while monocotyledon species show an opposite trend.

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

Cited by 57 publications

References 59 publications

The effect of contaminants on the adhesion of the spatulae of a gecko

The effect of contaminants on the adhesion of the spatulae of a gecko

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Evaluating the Competition of Lignocellulose Raw Materials for their Use in Particleboard Production, Thermal Energy Recovery, and Pulp- and Papermaking

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