Charalampos Lykidis

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• Professor
• Professor (Assistant) at Aristotle University of Thessaloniki

Nanotechnology seems a promising sector for the development of methods with the purposes of reducing formaldehyde emissions from wood-based composites. Nanoparticles exhibit great advantages since they can reduce formaldehyde emissions through (i) indirectly increasing the curing degree of the resins, thus resulting improved hydrolytic stability du...

The vertical density profile (VDP) of thermo-hydro-mechanically (THM) densified wood is a result of the combined effect of process parameters and properties of unmodified wood. The effect of thermosetting resins on VDP of THM densified wood has not been extensively studied. The aim of this study was to determine the combined effect of methylated me...

Densification of resin impregnated wood under hot-pressing is a method that along with the potential for the reduction of set-recovery could additionally increase the density of wood and further improve other technical properties. In this study, the effect of the methylated melamine-formaldehyde modification on the shape memory effect of densified...

Thermally modified wood (TMW) is currently produced commercially by a range of processes across many countries. A prerequisite of the commercial success is an efficient quality control (QC), and methods with this regard are discussed in this review. When direct measurement of the key attribute of the material is not feasible, QC is based on a suita...

The requirement for alternative raw materials for fuel pellets that would enable the use of readily available low-cost renewable resources and waste materials, such as bark, has always attracted interest. The aim of the current work was to assess the effect of black pine (Pinus nigra L.) bark content (0%–100%) as well as densification temperature o...

In order to meet the growing demand for raw material of solid biofuels, it is imperative to find alternative materials of low cost, underutilized so far. In this study, wood and bark material of two common cypress species (Mediterranean and Arizona cypress) were chemically characterized through gravimetric and spectroscopic (FTIR) analyses, to asse...

The purpose of the work was to assess the combined effect of furfurylation, along with the addition of silver nanoparticles (NPsAg), on the thermal stability, density, water absorption, hardness and biological durability of juvenile tropical woods originating from Costa Rican forest plantations. It was demonstrated that the weight percentage gain (...

Aim of this study was to evaluate the effect of aluminium hydroxide and borates, separately or combined with ammonium polyphosphate (APP), upon the technological and fire properties of medium density fibreboard (MDF). Fire resistant MDF was fabricated in the laboratory from Scots pine (Pinus sylvestris L.) fibres bonded with a high molar ratio mela...

In this research, acetylated wood (Accoya) was tested in ground contact in central Greece. After ten years of exposure during a ground stake test, acetylated pine wood (Pinus radiata) stakes, with a 20% acetyl weight gain, were completely intact and showed no visual decay (decay rating: 0). However, the key mechanical properties of Accoya wood, tha...

The fire retardancy of wood impregnated with a mixture of ammonium dihydrogen phosphate and ammonium sulfate recovered from exhausted fire extinguishing powder was assessed. Impregnated specimens recorded a 14.3% total weight loss due to combustion, as opposed to 93.8% for the untreated ones. Treated specimens also showed a significantly lower burn...

Forest biomass originating from Mediterranean forest vegetation could be a potential source of renewable energy in the form of pellets, butdue to its diversity there is a need for better understanding and detailed examination of its main fuel characteristics. The aim of this work was the evaluation of the impact that bark percentage and barked stem...

The objective of the work was to evaluate the efficacy of two new polyphosphate-based fire retardants (FRs) and one commercial product named Siriono® on the fire performance and physical-mechanical properties of medium density fibreboard (MDF) fabricated in the laboratory from Scots pine (Pinus sylvestris L.) wood. The fibres were treated with aque...

In this research, the calorific value and ash content of wood and bark of some fast-growing hardwood species, such as tree-of-heaven, (Ailanthus altissima (Miller) Swingle), empress tree (Paulownia tomentosa (Thunberg) Steudel), trembling aspen (Populus tremuloides Michaux), oriental plane (Platanus orientalis Linnaeus) and black locust (Robinia ps...

The use of agricultural biomass to produce biofuels and energy can provide many environmental and socio-economic benefits. This research project examines the possibility of replacing part of the wood material in a pellet with various proportions of residues of agricultural crops such as medic, maize, wheat bran, wheat straw, sunflower, and cardoon....

em>Sinoxylon anale Lesne, 1897 and S. unidentatum (Fabricius, 1801) (Coleoptera, Bostrichidae), two almost cosmopolitan species most likely native of the Oriental Region, are recorded for the first time from Greece on the basis of several specimens intercepted in a consignment at the Piraeus harbor (Attica, Athens) in wood packaging material origin...

The field of wood protection is currently changing due to the restrictions imposed by the Biocidal Products Regulation. The need for development of new wood protection technologies is therefore growing. In this work, the resistance of European beech (Fagus sylvatica L.) wood impregnated with nano-dispersions of zinc oxide (nano-ZnO) and zinc borate...

In this work, the biological resistance of Scots pine (Pinus sylvestris L.) wood impregnated with nanosized zinc oxide and zinc borate against the fungi Poria placenta and Serpula lacrymans was evaluated. It can be concluded that nano-sized zinc oxide inhibited the biological degradation of pine wood against Serpula lacrymans, while it was ineffect...

The investigation of thermal characteristics of several wood species seem to be of great importance for the comprehension of their behavior as bio-fuels and implementation of their proper utilization. Aim of this work is the examination of some basic thermal characteristics, such as heating value and ash content of wood and bark material of some na...

In this work, the effects of the impregnation with nano-ZnO and nano-ZnB dispersions on the termite resistance of European beech wood were investigated. Three different concentrations (namely 0.5%, 1% and 2%) of the above two materials were tested. Water leaching effect was also investigated. It was concluded that a severe effect in terms of termit...

Furfurylation is a modifi cation process carried out in order to improve the biological resistance and dimensional stability of wood. In this research work, a three-year outdoor weathering test of furfurylated wood was performed using the following wood materials: a deck of furfurylated radiata pine (Pinus radiata), a deck of furfurylated maple (Ac...

Purpose of this study was to assess a modification to the hardness determination method in order to mitigate the effect of visual measurements on the consistency of Brinell method and accuracy of the results. The amendment has been previously proposed by other researchers and refers to the automated determination of indentation diameter and relies...

A significant proportion of Mediterranean forest vegetation consists of evergreen small diameter hardwood trees and shrubs which are traditionally used as fuelwood for domestic heating purposes. Nevertheless, their utilization in the form of pellets or briquettes could increase their energy efficiency. Due to differences in chemical structure, bark...

This paper investigates the basic hygroscopic properties and formaldehyde content (FC) of particleboards produced with wood biomass from fruit tree branches and evergreen hardwood shrubs as substitute raw materials for fir particles. One-layer laboratory particleboards with two distinct target densities (0.63 g/cm3 and 0.69 g/cm3) were produced usi...

This paper investigates the potential of utilising wood biomass from fruit tree branches and evergreen hardwood shrubs as raw materials in the production of particleboards when mixed with Greek fir wood particles. The main mechanical properties of the boards made therefrom were determined and compared with those made of typical industrial wood (IW)...

In this work, the brown rot resistance of black pine (Pinus nigra L.) wood, pressure-treated in an autoclave with nano-sized zinc borate and zinc oxide dispersions, was investigated. The two formulations based on zinc borate have given encouraging results, indicating fungicide effects of the metal nanoparticles on Coniophora puteana. In specific, m...

The growing need for wood combined with the global uprising of wood and petroleum prices as well as the need to protect forests are factors which -among others- are applying pressure on the sector of wood based panel industries in their pursuit of raw materials. Recycling of particleboards and fiberboards contained in municipal waste could contribu...

The particleboard and fibreboard waste constitutes in our days an important part of urban waste stream because they are used in increasing amounts for the production of interior wood constructions. The management of such waste already troubles the modern societies. Nevertheless, via recycling it is possible this waste material to constitute a valua...

The objective of this study was to investigate the possibility of using waste paper recovered from old corrugated containers (OCC) as substitute for wood particles in the production of particleboards. Three proportions of wood chips: waste paper flakes (100:0, 70:30, 50:50) were used in the production of one-layer and the core of three-layer experi...

Γεωτεχνικά Επιστημονικά Θέματα 38: 12-19

The aim of the present paper was to study the effect of some particle recovery parameters on the quality of hydrothermally recycled particleboards. The research was carried out in two phases: rough evaluation of various recovery parameters and determination of the recycled particleboard properties. It was concluded that the optimum group of hydroth...

The aim of the present paper was to study the effect of a hydrothermal recovery process on the acidity, chemical composition and formaldehyde emission of wood particles recovered from laboratory and waste particleboards. The hydrothermal treatments were carried out with saturated steam for 10min at a temperature of 150°C, after water impregnating o...

Recycling today constitutes the most environmentally friendly method of managing wood waste. A large proportion of the wood waste generated consists of used furniture and other constructed wooden items, which are composed mainly of particleboard, a material which can potentially be reused. In the current research, four different hydrothermal treatm...

Recycling today constitutes one of the environmentally most respectable methods of managing waste particleboards. Hydrothermally recycled particleboards in which no fresh particles are added illustrate downgraded hygroscopic and mechanical properties due to thermal degradation. In the current research formaldehyde emission of hydrothermally recycle...

Oriented Strand Board is a Wood Based Panel which, although well known and widely used in many European countries is a rather new product for the Greek market resulting to its reduced application and -sometimes- improper use. Consequently, information about OSB properties is essential for its acceptance and proper use. The aim of the present work w...

The effects, on the properties of recycled particleboards made from recovered wood particles, when subjected to four different hydrothermal board treatments (2bar/ 119°C/ 480min, 4bar/ 140°C/ 120min, 6bar/ 156°C/ 45min, 8bar/ 167°C/ 20min) were investigated in the present work. Furthermore, the impact of a 2nd recycling process on the properties of...

The particleboard waste constitutes in our days an important part of urban waste stream. The management of such waste already troubles the modern societies. Nevertheless, via recycling it is possible for this material to constitute a valuable resource for the production of new wood based panels thus helping on one part in the partial satisfaction o...