Abstract
Time-resolved diffuse optical spectroscopy (TRS) was investigated as a nondestructive method to characterize the post-impregnation distribution of methacrylate monomers within spruce (Picea abies). TRS was also used to monitor the flow of methacrylate monomers in situ, within spruce, during impregnation with both spatial and temporal resolution. The data were compared to fluid flow models developed by Darcy and Bramhall demonstrating that neither of these models were able to accurately describe the experimental results, highlighting the need for development of new models. Nondestructive characterization by TRS did not require staining of the monomer treatment solution, multivariate analysis or complex sample pre-treatment, thus highlighting the facile applicability of this technique.
Highlights
The different distribution pattern of the data in circles, as shown in Fig. 2, compared with other samples is thought to be an indication of significantly increased permeability in this specific sample, perhaps arising from micro-cracks invisible by eye
Time-resolved diffuse optical spectroscopy (TRS) allowed for nondestructive, quantitative analysis of monomer distribution within impregnated wood
The distribution profile determined by TRS was consistent with previous literature and destructive characterization of polymer distribution
Summary
Flow and sorption within wood are non-trivial processes as evidenced by numerous investigations spanning more than four decades Wood Sci Technol (2017) 51:227–242 et al 2014; Fackler and Thygesen 2013) Most of these studies have focused on the sorption of moisture by wood, which has implications for living plants (Tyree and Ewers 1991) and for timber as a construction material (Bratasz et al 2012; Xie et al 2011; Telkki et al 2013). With the exception of supercritical CO2, few recent studies exist investigating the flow of non-aqueous solutions through wood. While investigation of the final distribution (topochemistry) of non-aqueous treatments within wood is well known (Mahnert et al 2013), as are studies into wettability and sorption with non-aqueous media (Moghaddam et al 2014), the kinetics and flow processes have not typically been characterized
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