PROTECTION OF WOOD AGAINST FUNGAL INFECTIONS AND INVOLVED PHYSICO-CHEMICAL PROBLEMS
Adsorption of pinosylvin
Pinosylvin and polyhydroxybenzene derivatives are natural components of wood, known for their fungicidal/fungistatic properties. These components were used as adsorbates in some of our investigations [1-5]. Lignin and cellulose powder were used as model substrates in order to aquire information about the attachment of the adsorbates to the structure of wood. The adsorbate-substrate interaction was investigateded by the diffuse reflectance technique, commonly known as DRIFTS when used in conjunction with Fourier transform infrared (FT-IR) instruments. Furthermore, the adsorption of pinosylvin onto twelve different types of wood was studied, by means of the Raman microprobe technique [1, 6]. The effects of the solvents used, B.E.T. specific surface area, heat treatment and lignin content (as measured by the kappa-value), have been quantified by means of the Raman intensity ratios of characteristic peaks. The amount of solvent residue in each sample has been measured by the DRIFT technique. The morphology of the samples was investigated with the aid of scanning electron microscopy (SEM) images [1, 6].
Surface modification of wood
Recently, we focus our attention on the characterization and surface modification of wood [7-9]. The goal of surface modification of wood can be extremely diverse, e.g. to enhance the durability, to prevent the premature weathering failure, to improve the weathering performance and to improve the interaction between wood and adhesives, etc. On the one hand, different analytical methods are applicable to characterize the untreated wood itself and to observe the changes of the surface characteristics on modified substrates. We apply different spectroscopic methods, including FT-IR techniques, Raman microprobe, ESCA (XPS), etc., and theoretical calculations for the support of the vibrational spectroscopic studies (extractive components, [9-12]) in order to get information about the modified and unmodified wood surfaces. On the other hand we study the wetting phenomena on wood surfaces in order to achieve a better understanding of which also may guide us to improve the aforementioned properties of wood and wood products [13]. The adhesion properties and surface energetics are studied by contact angle determinations and the results are compared with those of the surface analytical methods [13-16].
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Individual representation
An alternative method, the so-called individual representation (or substantial parameter method) is also applied for the evaluation of experimental contact engle values to obtain surface free energy of solids [13, 15].
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COST Action E41
Our group joined the COST Action E41 entitled „Analytical tools with applications for wood and pulping chemistry” (see Ref [O1-O3]). A study tour was made to Chemical Technology of Organic Materials of the Johannes Kepler Univerity at Linz, Austria, in order to observe jointly an Eucaliptus globulus wood that is the common sample of the integration program of analytical methods organized in the frame of this COST action. For the results, see Ref. [16].
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We are also pleased for writing a review paper on phenols and its derivatives entitled "Vibrational spectroscopy of phenols and phenolic polymers. Theory, experiment and applications" [17].
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Selected publications:
1. MOHAMMEDNÉ ZIEGLER I.: Adsorption of Pinosylvin onto the Structure of Wood - Mechanism and Adsorption Parameters, Licentiate thesis, Luleå University of Technology, Lulea, Sweden, 2000.
2. BILLES F., MOHAMMED-ZIEGLER I., HOLMGREN, A., MIKOSCH, H.: Ab initio equilibrium geometry and vibrational spectroscopic study of pinosylvin, J. Phys. Chem. A, 106(26), 6032-6041 (2002).
3. MOHAMMED-ZIEGLER I., BILLES F.: Vibrational spectroscopic calculations on pyrogallol and gallic acid, J. Mol. Struct.-THEOCHEM, 618(3), 259-265 (2002).
4. MOHAMMED-ZIEGLER I., HOLMGREN, A., FORSLING, W., LINDBERG, M., RANHEIMER, M.: Mechanism of the Adsorption Process of Pinosylvin and Some Polyhydroxybenzenes onto the Structure of Lignin, Vibrational Spectroscopy, 36(1), 65-72 (2004).
5. BILLES F., MOHAMMED-ZIEGLER I., BOMBICZ P.: Vibrational spectroscopic study on the quantum chemical model and the X-ray structure of gallic acid, solvent effect on the structure and spectra, Vibrational Spectroscopy, 43(1), 193-202 (2007).
6. MOHAMMED-ZIEGLER, I., HOLMGREN, A., FORSLING, W., RANHEIMER, M.: Adsorption of Pinosylvin onto Different Species of Fresh and Stored Wood, Material Science: An Indian Journal, 6(4), 1- (2010).
7. MOHAMMED-ZIEGLER I., MAROSI GY., MATKÓ SZ., HÓRVÖLGYI Z., TÓTH A.: Silylation of Wood for Potential Protection against Biodegradation. An ATR-FTIR, Contact Angle and XPS Study, Polymers for Advanced Technologies, 14(11-12), 790-795 (2003).
8. MOHAMMED-ZIEGLER I., OSZLÁNCZI Á., SOMFAI B., HÓRVÖLGYI Z., PÁSZLI I., HOLMGREN, A., FORSLING, W.: Hydrophobicity of Natural and Surface Modified Tropical and European Wood Species, J. Adhesion Sci. Technol., 18(6), 687-713 (2004).
9. MOHAMMEDNÉ ZIEGLER I., BILLES F., HÓRVÖLGYI Z.: Öko-technológia megalapozása fafelületek gombásodás elleni védelmére az alapkutatások szintjén. 1. Rezgési spektroszkópiai vizsgálatok (Fundamental studies towards eco-technological wood preservation against fungal infections. 1. Vibrational spectroscopic studies), Biokémia, 30, 15-18 (2006). (in Hungarian)
10. MOHAMMEDNÉ ZIEGLER I., HÓRVÖLGYI Z., BILLES F.: Öko-technológia megalapozása fafelületek gombásodás elleni védelmére az alapkutatások szintjén. 2. Faminták felületi módosítása (Fundamental studies towards eco-technological wood preservation against fungal infections. 2. Surface modification of wood samples), Biokémia, 30, 39-44 (2006). (in Hungarian)
11. MOHAMMED-ZIEGLER I., MAROSI GY., MATKÓ SZ., HÓRVÖLGYI Z., TÓTH A.: Silylation of Wood for Potential Protection against Biodegradation. An ATR-FTIR, Contact Angle and XPS Study, Polymers for Advanced Technologies, 14(11-12), 790-795 (2003).
12. MOHAMMED-ZIEGLER I., OSZLÁNCZI Á., SOMFAI B., HÓRVÖLGYI Z., PÁSZLI I., HOLMGREN, A., FORSLING, W.: Hydrophobicity of Natural and Surface Modified Tropical and European Wood Species, J. Adhesion Sci. Technol., 18(6), 687-713 (2004).
13. PÁSZLI I., MOHAMMEDNÉ ZIEGLER I.: A peremszög-mérések alternatív kiértékeléséről (On the alternative evaluation of contact angle measurements), Magy. Kém. Foly., 111(2), 79-82, (2005). (in Hungarian)
14. MOHAMMED-ZIEGLER I., HÓRVÖLGYI Z., TÓTH A., FORSLING, W., HOLMGREN, A.: Wettability and spectroscopic characterization of silylated wood samples, Polymers for Advanced Technologies, 17(11-12), 932-939 (2006)
15. PÁSZLI I., MOHAMMED-ZIEGLER I., HÓRVÖLGYI Z.: Obtaining Surface Tension from Contact Angle Data by the Individual Representation Approach, Colloid Polym. Sci. 285(9), 1009-1018 (2007) .
16. MOHAMMED-ZIEGLER I., TÁNCZOS I., HÓRVÖLGYI Z.: Water-repellency of acylated and silylated wood samples and their surface analytical characterization, Coll. Surfaces A, 319(1-3), 204-212 (2008).
17. BILLES F., MOHAMMED-ZIEGLER I.: Vibrational spectroscopy of phenols and phenolic polymers. Theory, experiment and applications (review) , Appl. Spectrosc. Rev., 42, 369-441 (2007).
Other presentations
O1. MOHAMMED-ZIEGLER, I.: National research activities in Hungary in the frame of COST E41 „Analytical tools with applications for wood and pulping chemistry”, COST Action E41 Workshop and MC meeting, Spectrometric techniques used for the analysis of Carbohydrides, Lignin and Extractives, Hisperia Sant Just, Barcelona, Spain, April 24-26, 2005. (oral)
To read the abstract go to :
O2. MOHAMMED-ZIEGLER I., TÁNCZOS I., HÓRVÖLGYI Z., AGOSTON, B.: Reactivity of Eucaliptus globulus wood in acetylation and silylation reactions studied by different surface analytical methods, COST Action E41 Workshop and MC meeting, Sample preparation and selected presentations from the “COST E41 Joint Analysis Effort” on wood and fibre characterisation., Vienna, Austria, Aug 31-Sept 1, 2006. (oral) Book of Abstracts. p. 28. (oral)
To read the abstract go to :
O3. BILLES F., MOHAMMED-ZIEGLER I.: Application of quantum chemical modelling for the elucidation of the role of the functional groups in wood protecting materials, COST Action E41 Workshop and MC meeting, Workshop: Functional groups and surface analysis of wood and fibres, Monte Porzio di Catone, Villa Mondragone, Italy, May 7-8, 2007. Book of Abstracts. p. 17. (poster)
To read the abstract go to :
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For the full list of publications go to :
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