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Effects of different energy intensities of microwave treatment on heartwood and sapwood microstructures in Norway spruce
Ganguly, Sauradipta (Author), Balzano, Angela (Author), Petrič, Marko (Author), Kržišnik, Davor (Author), Tripathi, Sadhna (Author), Žigon, Jure (Author), Merela, Maks (Author)

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Abstract
Microwave modification can increase the permeability of wood by delaminating and rupturing its anatomical microstructures at their weak points. A high degree of intensity of microwave modification can cause significant structural damage to the microstructures of wood, resulting in poorer strength properties. The objective of this study was to evaluate the changes in the anatomical structure of Norway spruce (Picea abies (L.) Karst.) heartwood and sapwood after microwave modification in order to develop the most effective treatment in terms of applied energy without causing significant structural damage. Analysis with light and scanning electron microscopy were performed to evaluate the effect of microwave treatment for two different energy intensities, moderate and high intensity. The results indicated structural changes in the tracheid cells. Microscopy showed varying degrees of modification within the wood microstructure, with the heartwood samples showing a greater anatomical distortion compared to their sapwood counterparts. Furthermore, the samples were subjected to pycnometric density measurements, which indicated a reduction in skeletal and absolute density after microwave modification, for both high and moderate intensity treatment on sapwood and heartwood samples. With increasing microwave energy, a gradual increase in specific pore volume and porosity percentage of the samples were also detected.

Language:English
Keywords:Picea abies, microwave treatment, light microscopy, scanning electron microscopy, wood anatomy, wood properties, density, permeability
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2021
Number of pages:[17] str.
Numbering:iss. 5, 12
UDC:630*8
ISSN on article:1999-4907
DOI:10.3390/f12050598 This link opens in a new window
COBISS.SI-ID:62577411 This link opens in a new window
Views:156
Downloads:66
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Record is a part of a journal

Title:Forests
Shortened title:Forests
Publisher:MDPI
ISSN:1999-4907
COBISS.SI-ID:3872166 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P4-0015
Name:Les in lignocelulozni kompoziti

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:10.05.2021

Secondary language

Language:Slovenian
Keywords:obdelava z mikrovalovi, svetlobna mikroskopija, elektronska vrstična mikroskopija, anatomija lesa, lastnosti lesa, gostota, permeabilnost

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