Microstructural investigation of UV-laser irradiated pine (Pinus silvestris L.)

Wu, Rong-Tsun; Seltman, J.

doi:10.1007/bf00704841

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…A Leica DMRM optical microscope (Leica Microsystems AB, Stockholm, Sweden), equipped with a fluorescence filter (Leica filter cube H3) and a CCD camera (Leica DFC 280), was used for examining the bonded joints of the wood substrates. Prior to the analysis, the cross sections of the wood substrates were prepared either with razor‐blade cutting by hand or with UV‐laser irradiation (UV‐laser ablation) 19, 20. The ablated substrates were prepared using a UV excimer laser (Luminox).…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of sensitive hydrogels based on semi‐interpenetrated networks of poly[2‐ethyl‐(2‐pyrrolidone) methacrylate] and hyaluronic acid

Magalhães

Sousa

Mano

et al. 2012

J Biomedical Materials Res

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Sensitive hydrogels attract interest due to their soft wet appearance and shape response to environmental variations. The synthesis and characterization of semi-interpenetrated hydrogels obtained by radical-induced polymerization of 2-ethyl-(2-pyrrolidone)methacrylate (EPM) in the presence of different concentrations of hyaluronic acid (HA) using N,N'-methylene-bisacrylamide or triethylene glycol dimethacrylate as crosslinker, followed by freeze-drying, are described. Polymeric systems were characterized by NMR, FTIR, SEM, TGA, and DMA. PEPMHA hydrogels' mechanical properties and swelling were found to be intimately related to HA concentration and crosslinker. The swelling response was assessed for temperature and pH variation in order to study the behavior of the hydrogels. We found that the presence of HA in PEPM polymeric systems induced a sensitivity to pH variation rather than temperature. Finally, the biocompatibility profile of the hydrogels was evaluated, using mesenchymal stem cells. Cell adhesion and proliferation results revealed the non-cytotoxicity of the systems. We estimate that PEPMHA hydrogels can be used for applications in tissue engineering and for the controlled release of bioactive compounds.

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of sensitive hydrogels based on semi‐interpenetrated networks of poly[2‐ethyl‐(2‐pyrrolidone) methacrylate] and hyaluronic acid

Magalhães

Sousa

Mano

et al. 2012

J Biomedical Materials Res

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show abstract

“…Prior to the analysis, the cross sections of the wood substrates were prepared either with razor-blade cutting by hand or with UV-laser irradiation (UV-laser ablation). 19,20 The ablated substrates were prepared using a UV excimer laser (Luminox). A wavelength of 248 nm, an irradiation energy of 333 mJ, and a repetition frequency of 4 Hz were employed.…”

Section: Optical Microscopymentioning

confidence: 99%

Wheat gluten fractions as wood adhesives—glutenins versus gliadins

Nordqvist

Thedjil

Khosravi

et al. 2011

J of Applied Polymer Sci

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Plant proteins, such as wheat gluten, constitute attractive raw materials for sustainable wood adhesives. In this study, alkaline water dispersions of the protein classes of wheat gluten, glutenin, and gliadin were used as adhesives to bond together wood substrates of beech. The aim of the study is to measure the tensile shear strength of the wood substrates to compare the adhesive performance of glutenin and gliadin and to investigate the influence of application method and penetration of the dispersions into the wood material. A sodium hydroxide solution (0.1M) was used as dispersing and denaturing agent. Dispersions with different protein concentrations and viscosities were used, employing wheat gluten dispersions as references. Two different application methods, a press temperature of 110 C and a press time of 15 min, were employed. The tensile shear strength and water resistance of the wood substrates were compared, using a slightly modified version of the European Standard EN 204. The bond lines of the substrates were examined by optical microscopy to study the penetration and bond-line thickness. The results reveal that the adhesive properties of gliadin are inferior to that of both glutenin and wheat gluten, especially in terms of water resistance. However, the tensile shear strength and the water resistance of gliadin are significantly improved when over-penetration of the protein into the wood material is avoided, rendering the adhesive performance of gliadin equal to that of glutenin and wheat gluten. V C 2011 Wiley Periodicals, Inc. J Appl

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“…The experience so far regarding the application of UV laser irradiation for sample preparation for microscopy studies of wood and wood composites (Seltman, 1995;Wu & Seltman, 1998;Stehr et al, 1998;Sandberg, 1999;Kopp et al, 2005;Mertens et al, 2006;Sandberg & Sö derströ m, 2006;Segerholm et al, 2007;Almkvist, 2008) implies a number of obvious advantages compared with conventional sample preparation techniques: (1) the wood microstructure is efficiently revealed with no mechanically induced microcracks and redistribution of polymers or other mobile substances in the prepared surface;…”

Section: Introductionmentioning

confidence: 98%

Micromorphological studies of modified wood using a surface preparation technique based on ultraviolet laser ablation

Wålinder¹,

Omidvar²,

Seltman³

et al. 2009

Wood Material Science & Engineering

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The objective of this paper is to demonstrate an ultraviolet (UV) laser ablation technique as a tool for sample preparation in microscopy studies of modified wood. Improved techniques for studying the microstructure of modified wood are crucial for a deeper understanding of many of their physical, mechanical and durability properties. The surface preparation technique is described in this paper. An illustration of micrographs of the micromorphology and polymer distribution in some examples of modified wood is also presented. It is clearly demonstrated that in contrast to conventional surface preparation techniques used for light microscopy and scanning electron microscopy, i.e. razor blade and microtome cutting techniques, UV laser ablation does not introduce any mechanically induced microcracks and redistribution of polymers or other mobile substances in the prepared surface. Results also show that, in particular, this technique seems to be suitable for studying polymer distribution in resin-impregnated wood, as well as detection of microcracks in modified wood cell walls.

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Microstructural investigation of UV-laser irradiated pine (Pinus silvestris L.)

Cited by 8 publications

References 3 publications

Synthesis and characterization of sensitive hydrogels based on semi‐interpenetrated networks of poly[2‐ethyl‐(2‐pyrrolidone) methacrylate] and hyaluronic acid

Synthesis and characterization of sensitive hydrogels based on semi‐interpenetrated networks of poly[2‐ethyl‐(2‐pyrrolidone) methacrylate] and hyaluronic acid

Wheat gluten fractions as wood adhesives—glutenins versus gliadins

Micromorphological studies of modified wood using a surface preparation technique based on ultraviolet laser ablation

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