The mechanical properties and thermal conductivity of bamboo with freeze–thaw treatment

Wu, Jiahui; Wang, Xianke; Fei, Benhua; Xu, Xiang; Lian, Caiping; Chen, Hong

doi:10.1186/s10086-021-01998-0

Cited by 17 publications

(10 citation statements)

References 27 publications

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“…The continuous photolysis of lignin and the decrease in mechanical strength caused a constant decrease in E′. The peak near T g shifted toward higher temperatures in E″, which was also caused by a decrease in lignin and a relative increase in the cellulose content with a higher primary transition temperature than lignin [ 45 ]. Similarly, in tan δ , the primary transition peak was consistent with E″, and the secondary transition peak gradually decreased in height.…”

Section: Resultsmentioning

confidence: 99%

“…Freeze–thaw cycle and damp–heat treatment resulted in the peak intensity at 3400 cm −1 being slightly lower, which was attributed to the two free hydroxyl groups in the cellulose amorphous region combined at a high temperature and the formation of hydrogen bonds by the action of water molecules. In addition, the peak intensity at 2900 cm −1 and 1060 cm −1 reduced, owing to the decomposition of aliphatic, β-glycoside structure and other substances [ 26 , 45 ]. Degradation of lignin was manifested in a decrease in the peak at 1640 cm −1 and 1260 cm −1 , which was attributed to the benzene ring skeleton vibration [ 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

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Effect of Accelerated Aging on Bamboo Fiber Lunch Box and Correlation with Soil Burial Degradation

et al. 2022

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This study aimed to investigate the mechanical property decay that might occur during actual use and soil burial degradation of bamboo fiber lunch boxes. For this, the effects of three accelerated aging methods, namely damp–heat treatment, freeze–thaw cycle, and artificial weathering cycle, on the tensile strength, dynamic viscoelasticity, and chemical composition of bamboo fiber lunch boxes were compared, and a correlation of their mechanical property decay with soil burial degradation was established to obtain an acceleration factor (SAF) with aging time as a reference. The results showed that the mechanical properties of the bamboo fiber lunch box decreased to different degrees under the three accelerated methods, and the tensile strength decreased to less than 50% after 36 h of damp–heat treatment, 5 freeze–thaw cycles, and 11 artificial weathering cycles. However, after 10 days, the mechanical property of lunch box in soil degradation decreased by more than 50%. Infrared spectroscopy demonstrated rapid hemicellulose degradation during damp–heat treatment and freeze–thaw cycle, as well as a minor quantity of lignin, and a significant amount of lignin under artificial weathering cycle. With the freeze–thaw cycle and the artificial weathering cycle, the relative crystallinity dropped quickly, by 32.3% and 21.5%, respectively, but under damp–heat treatment, the crystallinity dropped barely, by 43.5%. The damage caused by the freeze–thaw cycle to the mechanical properties of bamboo fiber lunch boxes was greater than that by the damp–heat treatment and artificial weathering cycle. The fluctuation of SAF under freeze–thaw cycle was also more drastic. Compared to the artificial weathering cycle, the damp–heat treatment was more stable and reliable in predicting the decay law of soil burial degradation tensile strength of bamboo fiber lunch boxes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Accelerated Aging on Bamboo Fiber Lunch Box and Correlation with Soil Burial Degradation

et al. 2022

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“…Recently, Wang et al reported that freeze–thawing pretreatment effectively shortened the vacuum freeze-drying duration by 4–6 h and reduced energy consumption by 10.0–15.1 g/100 g compared with the traditional alkaline-dewaxing method. During the freeze–thaw treatment, ice crystals are pierced into the cell wall, causing water to be better able to exit the plant body since the ice crystals pierce the cell wall. , Dhiman et al described blanching as the result of solubilization of pectic polymers that play an important role in cell–cell adhesion, as well as depolymerization of these polymers.…”

Section: Introductionmentioning

confidence: 99%

“…During the freeze–thaw treatment, ice crystals are pierced into the cell wall, causing water to be better able to exit the plant body since the ice crystals pierce the cell wall. 18 , 19 Dhiman et al 20 described blanching as the result of solubilization of pectic polymers that play an important role in cell–cell adhesion, as well as depolymerization of these polymers.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Bioactive Metabolites and Antioxidant Activities in Solid and Liquid Fractions of Fresh Duckweed (Wolffia globosa) Subjected to Different Cell Wall Rupture Methods

Yadav,

Patel,

Debbarma

et al. 2024

ACS Omega

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Fresh Wolffia globosa, the smallest flowering plant well-known for its favorable nutrient composition and rich content of bioactive compounds, was subjected to boiling, freeze−thawing, and mechanical crushing to reduce its excessive (95−96%) moisture level and consequent drying time. The resultant three wolffia matrixes were filtered through a plankton net to fractionate into the residue and the filtrate. The proximate composition, bioactive metabolites, antioxidant activity, and characterization of bioactive metabolites by LC-ESI-QTOF-MS/MS and Fourier transform infrared spectroscopy were made from oven-dried residues and filtrates. Among residues, crude protein (29.84%), crude lipid (5.77%), total carotenoids (TCC; 722.8 μg/g), and vitamin C (70.02 mg/100 g) were the highest (p < 0.05) for freeze−thawing against higher ash (7.99%), total phenolic content (TPC; 191.47 mg GAE g −1 dry weight), total flavonoid content (TFC; 91.54 mg QE g −1 dry weight), DPPH activity (47.46%), and ferric reducing antioxidant power (FRAP) activity (570.19 μmol FeSO 4 equiv/mg) for the crushed counterpart and Chl-b in residues from boiling. No significant variation was evident in the total tannin content (TTC). Among filtrates, higher total phenolic content (773.29 mg GAE g −1 dry weight), TFC (392.77 mg QE g −1 dry weight), TTC (22.51 mg TAE g −1 ), and antioxidant activity as DPPH activity (66.46%) and FRAP (891.62 μmol FeSO 4 equiv/mg) were evident for boiling, while that from crushing exhibited the highest TCC (1997.38 μg/g DM). LC-ESI-QTOF-MS/MS analysis identified 72 phenolic compounds with the maximum in residue (33) and filtrate (33) from freeze−thawing, followed by crushing (18 and 19) and boiling (14 and 13) in order, respectively. The results indicated that the predrying cell rupturing method significantly impacted quantitative, as well as qualitative compositions of residues and filtrates from fresh wolffia.

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“…For the last few years, bio-inspired superhydrophobic surfaces have attracted more attention in industrial and research applications [1]. As a green, renewable, inexpensive, easily harvested, biodegradable, and abundant resource, balsa wood has great potential for the development of multi-functional composite materials because of its unique chemical components and natural hierarchical porous structure [2], which can be achieved by exploiting the unique chemical components, high porosity, and natural hierarchical structure of wood in one step. In past decades, wood has been functionalized as a template with multiple functions and applications, such as for lightweight structural materials, transparent windows, oil-water separation, water processing, solar evaporation, and other functions.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mildew-Resistant Wood with Multi-Functional Properties Based on In Situ Growth of Metal–Organic Frameworks

Liang,

Zhang,

et al. 2024

Polymers

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Wood is easily affected by decay fungi, mildew fungi, insects, water, UV, and other factors when used outdoors. In particular, mildew on the surface of wood negatively affects the appearance and practical use of wood or wood-based engineered products. In recent years, as a class of popular crystalline materials, metal–organic frameworks (MOFs) have been widely applied in electrochemistry, adsorption, anti-mildew efforts, and other areas. In this study, we first grew a Co-based metal–organic framework (Co-MOF) in situ on a wood surface and subsequently converted the Co-MOF in situ into a cobalt–nickel double hydroxide layer, which formed micro- and nanohierarchical composite structures on the wood surface. The low surface energy of the CoNi-DH@wood was further modified via impregnation with sodium laurate to obtain the superhydrophobic wood (CoNi-DH-La@wood). We characterized the microstructure, chemical composition, water contact angle, and anti-mold properties of the CoNi-DH-La@wood using SEM, XRD, XPS, water contact angle tests, and anti-fungal tests. The SEM, XRD, and XPS results confirmed that the metal–organic framework was coated on the wood surface, with the long-chain sodium laurate grafted onto it. The CoNi-DH-La@wood had a water contact angle of 151°, demonstrating excellent self-cleaning ability. In addition, the fabricated superhydrophobic balsa wood exhibited excellent chemical and environment stability. Lastly, the CoNi-DH-La@wood exhibited excellent anti-mildew properties in a 30-day anti-mildew test because the superhydrophobic coating was successfully coated on the wood surface. In summary, this work presents an attractive strategy for obtaining wood with superhydrophobic properties at room temperature, thereby endowing the wood or wood-based engineered products with excellent anti-mildew properties.

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The mechanical properties and thermal conductivity of bamboo with freeze–thaw treatment

Cited by 17 publications

References 27 publications

Effect of Accelerated Aging on Bamboo Fiber Lunch Box and Correlation with Soil Burial Degradation

Effect of Accelerated Aging on Bamboo Fiber Lunch Box and Correlation with Soil Burial Degradation

Characterization of Bioactive Metabolites and Antioxidant Activities in Solid and Liquid Fractions of Fresh Duckweed (Wolffia globosa) Subjected to Different Cell Wall Rupture Methods

Fabrication of Mildew-Resistant Wood with Multi-Functional Properties Based on In Situ Growth of Metal–Organic Frameworks

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