Wood facade materials ageing analysis by FTIR spectroscopy

Gupta, Barun Shankar; Jelle, Bjørn Petter; Gao, Tao

doi:10.1680/coma.13.00021

Cited by 23 publications

(18 citation statements)

References 51 publications

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“…95 The nanoIR spectra at different locations across the untreated cross section exhibited bands corresponding to the CO and CC vibrations ( Figure 3G,H). The ratio of the band intensity of the CO stretching in hemicellulose (ester) 96,97 at 1740 cm −1 and the aryl stretching in lignin at 1595 cm −196,97 indicate significant changes with value of 1.3−1.5 in the secondary layers (points 1,2,3,5 in Figure 3B, G) and 0.8 in the middle lamella (point 4 in Figure 3B, G). Clear structural (Figure 3A and D) and chemical ( Figure 3G,H and Figure S6) differences can be noted after the cosolvent reaction across the deconstructed cell walls.…”

Section: Journal Of the American Chemical Societymentioning

confidence: 94%

A Multifunctional Cosolvent Pair Reveals Molecular Principles of Biomass Deconstruction

Patri

Mostofian

et al. 2019

J. Am. Chem. Soc.

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The complex structure of plant cell walls resists chemical or biological degradation, challenging the breakdown of lignocellulosic biomass into renewable chemical precursors that could form the basis of future production of green chemicals and transportation fuels. Here, experimental and computational results reveal that the effect of the tetrahydrofuran (THF)−water cosolvents on the structure of lignin and on its interactions with cellulose in the cell wall drives multiple synergistic mechanisms leading to the efficient breakdown and fractionation of biomass into valuable chemical precursors. Molecular simulations show that THF− water is an excellent "theta" solvent, such that lignin dissociates from itself and from cellulose and expands to form a random coil. The expansion of the lignin molecules exposes interunit linkages, rendering them more susceptible to depolymerization by acid-catalyzed cleavage of aryl-ether bonds. Nanoscale infrared sensors confirm cosolvent-mediated molecular rearrangement of lignin in the cell wall of micrometer-thick hardwood slices and track the disappearance of lignin. At bulk scale, adding dilute acid to the cosolvent mixture liberates the majority of the hemicellulose and lignin from biomass, allowing unfettered access of cellulolytic enzymes to the remaining cellulose-rich material, allowing them to sustain high rates of hydrolysis to glucose without enzyme deactivation. Through this multiscale analysis, synergistic mechanisms for biomass deconstruction are identified, portending a paradigm shift toward first-principles design and evaluation of other cosolvent methods to realize low cost fuels and bioproducts.

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Section: Journal Of the American Chemical Societymentioning

confidence: 94%

A Multifunctional Cosolvent Pair Reveals Molecular Principles of Biomass Deconstruction

Patri

Mostofian

et al. 2019

J. Am. Chem. Soc.

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“…It should be noted that both indexes can be used to evaluate the conservation state of historical and archaeological woods (Gupta et al 2015;Cavallaro et al 2018). As evidenced by Fig.…”

Section: Ftir Spectroscopymentioning

confidence: 98%

Comparative study of historical woods from XIX century by thermogravimetry coupled with FTIR spectroscopy

2019

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Thermal and structural properties of historical woods from apparatuses of the Historical Collection of the Physics Instruments of the University of Palermo have been investigated by FTIR spectroscopy coupled with thermogravimetric (TG) analysis. Specifically, the wooden portions of apparatuses from XIX century have been studied. The thermal behavior of the wooden materials has been successfully interpreted on the basis of specific indexes determined by the quantitative analysis of the FTIR spectra. The kinetics of the wood pyrolysis have been investigated by using a non-isothermal approach based on model-free isoconversional procedures, such as Kissinger−Akahira−Sunose (KAS) and Friedman methods. Interestingly, the activation energy of the pyrolysis process reflects both the peculiar composition (related to the specific wooden taxon) and the conservation state of the historical woods. The thermogravimetric parameters have been correlated to the lignin index of the woods by proper experimental equations, which can be considered as a novel protocol to estimate the preservation conditions of historical woods from different taxon.

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“…The absorbance in the range of 2800 to 2900 cm -1 is caused by CH stretching in the crystalline region of cellulose. The individual band in the region 1800 to 800 cm -1 is related to the absorbed O-H vibration, CH deformation, C-O stretch lignin, and carbohydrates (Gupta et al, 2015). In particular, the intensity of the peak at 1104 cm -1 caused by the vibration of cellulose 2θ (°) Intensity alcohol was very small in the untreated sample, whereas it increased in the DES-treated products.…”

Section: Functional Group Analysis Of the Des-treated And Untreated Samplesmentioning

confidence: 98%

Treatment effects of choline chloride-based deep eutectic solvent on the chemical composition of red pine (Pinus densiflora)

Kwon

Yang

Park

et al. 2020

BioRes

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Effects of deep eutectic solvent (DES) treatment were determined for the chemical composition of the sapwood and heartwood of red pine (Pinus densiflora). Two DES systems were made from the mixture of choline chloride (ChCl) and two different hydrogen bond donors (HBDs), namely, lactic acid (LA) and glycerin (GLY), with different molar ratios (1:2, 1:6, and 1:10). The yield of the solid residue after DES treatment decreased with an increase in the HBD concentration and treatment time, indicating that the water-soluble fraction was increased. The amount of solid residue was lower in the DES with LA than in DES with GLY, and higher in sapwood than in heartwood during both DES treatments. There was no substantial change in the lignin content of the samples, each being 24.7 to 29.5 wt.%, based on the mass of the treated product. Similar to the yield of the solid residue, cellulose and hemicellulose content in the treated product decreased with an increase in the HBD concentration and treatment time, and it was higher in sapwood than in heartwood. The cellulose crystallinity exhibited a slight increase with increasing treatment time, but there was no difference among the treatments using different molar ratios and between sapwood and heartwood.

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Wood facade materials ageing analysis by FTIR spectroscopy

Cited by 23 publications

References 51 publications

A Multifunctional Cosolvent Pair Reveals Molecular Principles of Biomass Deconstruction

A Multifunctional Cosolvent Pair Reveals Molecular Principles of Biomass Deconstruction

Comparative study of historical woods from XIX century by thermogravimetry coupled with FTIR spectroscopy

Treatment effects of choline chloride-based deep eutectic solvent on the chemical composition of red pine (Pinus densiflora)

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