Solute diffusion into cell walls in solution-impregnated wood under conditioning process I: effect of relative humidity on solute diffusivity

Tanaka, Soichi; Seki, Masayuki; Miki, Tsunehisa; Shigematsu, Ichinori; Kanayama, Kozo

doi:10.1007/s10086-015-1503-x

Cited by 14 publications

(27 citation statements)

References 10 publications

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“…In our previous studies [6,7], the solution-impregnated wood under conditioning swells with decreasing RH down to a level, and subsequently shrinks with decreasing RH to the further lower level, respectively, which is consistent with this mechanism.…”

Section: The Mixture Ratio At the End Of Conditioning Issupporting

confidence: 77%

“…In the previous studies [6][7][8], we have examined the effect of RH with a constant temperature on the solute diffusion into cell walls during the conditioning. In these studies, cross-cut wood samples were used, since they are favorable for causing the solute-concentration difference between cell walls and cell cavities.…”

Section: Introductionmentioning

confidence: 99%

“…It has been clarified that the RH affects the moisture variation in the impregnated wood [6]. The moisture variation also has been clarified to affect the solute-concentration difference [6] and the solute diffusivity [7], both of which determine the amount of the solute diffused into cell walls ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity

et al. 2017

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This study has focused on solute diffusing into cell walls in solution-impregnated wood under conditioning, process of evaporating solvent. The amount of the diffusion is known to be determined by the solute diffusivity and the solute-concentration difference between cell walls and cell cavities. Purpose of this paper was to clarify the effect of temperature only on the solute diffusivity that is directionally related to the thermal vibration of the solute molecule. The cross-cut block of hinoki (Chamaecyparis obtusa), polyethylene glycol (PEG1540), and water was employed as wood sample, solute, and solvent, respectively. The sample impregnated with a 20 mass% solution was conditioned at 20, 35, or 50°C to finish the solute diffusion evaluated using the dimension of the sample that was conditioned followed by drying in a vacuum. To unify the solute-concentration difference, for all temperatures, the equilibrium moisture content was unified and the solvent-evaporation rate was controlled in three ways during conditioning. The solute diffusivity was higher in order of 35, 50, and 20°C, which was evaluated by the solute diffusion at the same evaporation rate. It is clarified that the diffusivity increases with increasing the dimension of cell walls rather than with increasing the thermal vibration of solute molecule.

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Section: The Mixture Ratio At the End Of Conditioning Issupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity

et al. 2017

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“…An important consideration in the treatment of archaeological wood is the period of time taken to impregnate the artifact with the consolidating solution [6,7]. The processes involved in the diffusion of such solutions through fresh timber have been investigated in previous studies [22,25,28]. However, the area of archaeological WW conservation has received little research attention owing to practical and experimental difficulties and the wide variation in the characteristic properties of archaeological wood samples [6,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Diffusion of chemicals into archaeological waterlogged hardwoods obtained from the Thang Long Imperial Citadel site, Vietnam

et al. 2018

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This study shows a method to easily develop suitable impregnation procedure of chemicals for preserving the archaeological waterlogged wood (WW) using diffusion constant. The steady-state diffusion coefficients of polyethylene glycol 4000 (PEG4000), trehalose, and keratin through eight archaeological waterlogged wood species were obtained from the total amounts of the chemicals diffused through the wood samples. The diffusion coefficients were strongly affected by the anatomical structures of the wood species and degree of wood deterioration. Within the same species of wood, the highest diffusion rates were measured in the longitudinal direction, followed by those in the radial and tangential directions. The longitudinal diffusion coefficients were 1.5-to 8.1-times higher than the radial diffusion coefficients, which were in turn approximately 1.1-to 5.7-times higher than the tangential diffusion coefficients. The diffusion rates were found to be inversely proportional to the molecular weight of the diffusing chemical. The diffusivity of trehalose through the waterlogged woods was found to be higher than those of keratin and PEG4000. This study provides a potential method to easily estimate chemical diffusion coefficients for dip-diffusion treatments.

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“…Коэффициент влагопроводности древесины зависит от многих факторов: породы, плотности, анатомической структуры, направления тока влаги, влажности, температуры и др. В работах [7,8,9,10,11] установлено, что диффузорность древесины возрастает с увеличением размеров клеточных стенок, больше по сравнению с увеличением тепловых колебаний молекул жидкости, вследствие повышения температуры.…”

Section: Introductionunclassified

Moisture Conductivity of Apple Wood

Платонов¹,

Platonov

Волошин³

et al. 2018

Forestry Engineering Journal

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77549525 УДК 630.812:630.43 ВЛАГОПРОВОДНОСТЬ ДРЕВЕСИНЫ ЯБЛОНИ доктор технических наук, доцент А. Д. Платонов 1 С. И. Волошин 1 кандидат биологических наук, доцент С. Н. Снегирева 1 кандидат технических наук, доцент А. В. Киселева 1 доктор технических наук, профессор Н. В. Мозговой 2 доктор технических наук, профессор А. О. Сафонов 1 1-ФГБОУ ВО «Воронежский государственный лесотехнический университет имени Г.Ф. Морозова», г. Воронеж, Российская Федерация 2-ФГБОУ ВО «Воронежский государственный технический университет», г. Воронеж, Российская Федерация Древесина яблони является ценнейшим материалом и широко используется для изготовления различных изделий, в том числе и высокохудожественных поделок, благодаря своим высоким декоративным и прочностным свойствам (плотности и твердости). Эта древесина является сильноусыхающей и склонна к короблению и растрескиванию, в связи с чем её относят к трудносохнущим породам. Получение качественной высушенной древесины возможно при использовании технологии атмосферной сушки или камерной мягкими режимами, сочетая их с влаготеплообработкой. Поэтому на практике большое значение имеют сведения о кинетике и динамике процесса сушки. Для описания процессов высыхания и увлажнения древесины необходимо знать величину её коэффициента влагопроводности. Влагопроводность древесины зависит от многих факторов: плотности, направления тока влаги, влажности, анатомической структуры, температуры и др. Одним из факторов, оказывающих наибольшее влияние на влагопроводность древесины, является температура. При повышении температуры влагопроводность древесины существенно возрастает вследствие возрастания коэффициента диффузии как пара, так и влаги, находящейся в жидкой фазе. Коэффициент влагопроводности был определен экспериментально методом стационарного тока влаги в тангенциальном направлении для заболонной и ядровой древесины яблони. В результате выполненного исследования установлено изменение коэффициента влагопроводности заболонной и ядровой древесины яблони в интервале влажности от 5 до 25 % и при температуре 20 °С и 60 °С. Определено различие влагопроводности заболонной древесины и ядровой. Полученные результаты позволят произвести аналитические расчеты процессов высыхания и увлажнения древесины, разработать рациональные режимы камерной сушки и рекомендации для технологии атмосферной сушки.

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Solute diffusion into cell walls in solution-impregnated wood under conditioning process I: effect of relative humidity on solute diffusivity

Cited by 14 publications

References 10 publications

Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity

Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity

Diffusion of chemicals into archaeological waterlogged hardwoods obtained from the Thang Long Imperial Citadel site, Vietnam

Moisture Conductivity of Apple Wood

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