Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species <i>Eucalyptus</i> sp. and <i>Pinus elliottii</i>

Zanini, Márcia; Lavoratti, Alessandra; Lazzari, Lídia Kunz; Galiotto, Deise; Baldasso, Camila; Zattera, Ademir J.

doi:10.1155/2018/4646197

Cited by 7 publications

(4 citation statements)

References 49 publications

(61 reference statements)

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“…Two methods, namely Shamskar et al (2016) fabricated CNC aerogel via freeze-drying from raw cotton and cotton stalk and obtained aerogels with specific surface area of 91.47 and 93.89 m 2 /g, respectively [28]. Currently, most studies are focusing on the preparation of aerogel by either CNC [28][29][30][31][32] or CNF [33][34][35][36][37][38][39][40] only. A report focusing on the development of aerogel by mixing these two types nanocellulose is scarce.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, nanocellulose-based aerogels have been fabricated from various sources of biomass, including rice straw [ 42 ], jute fibers [ 43 ], Eucalyptus sp. and Pinus eliottii [ 37 ], poplar wood and cotton [ 44 ], softwood [ 38 ], pine needles [ 45 ], bamboo [ 12 ], kapok [ 46 ], and needle wood [ 47 ]. Indonesia, one of the largest palm oil producers globally, produced more than 45,000 tons of oil palm in 2019 [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

et al. 2021

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This study aims to explore the use of cellulose nanocrystals (CNC) and cellulose nanofiber (CNF), obtained from unbleached fiber of oil palm empty fruit bunches (EFB), as raw materials in fabricating aerogel, using the facile technique without solvent displacement. The CNC was isolated from sulfuric acid hydrolysis, and the CNF was fibrillated using Ultra Turrax. The CNC and CNF were mixed by ultrasonication in different ratios to produce aerogel using slow freezing (−20 °C), followed by freeze-drying. The obtained aerogel was characterized as ultralightweight and highly porous material, at the density range of 0.0227 to 0.0364 g/cm3 and porosity of 98.027 to 98.667%. Interestingly, the ratio of CNC and CNF significantly affected the characteristics of the obtained aerogel. The mixed aerogel exhibited a higher specific surface area than pure CNC or CNF, with the highest value of 202.72 m2/g for the ratio of 1:3 (CNC/CNF). In addition, the crystallinity degree of obtained aerogel showed a higher value in the range of 76.49 to 69.02%, with the highest value being obtained for higher CNC content. This study is expected to provide insight into nanocellulose-based aerogel, with a promising potential for various applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

et al. 2021

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“…The -OH absorption peak disappeared, indicating a chemical reaction between the acidic MTMS silica sol and wood components, resulting in the formation of a PMSQ coating with a Si-O-Si crosslinking network structure (1009 cm −1 ) [34]. However, the reaction was incomplete, as evidenced by the appearance of a characteristic Si-OH absorption peak at 893 cm −1 [35]. The spectrum of sample III, modified by PVA/acidic MTMS silica sol, revealed the presence of characteristic bands for both PVA and MTMS.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Innovative Treatment of Ancient Architectural Wood Using Polyvinyl Alcohol and Methyltrimethoxysilane for Improved Waterproofing, Dimensional Stability, and Self-Cleaning Properties

Zheng,

Tang,

Tong

et al. 2024

Forests

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This study introduced a novel two-step treatment to enhance the waterproofing, dimensional stability, and self-cleaning capabilities of ancient architectural wood. The process was initiated with the immersion of wood in an organic hybrid sol, composed of an acidic methyltrimethoxysilane (MTMS)-based silica sol and polyvinyl alcohol (PVA), which effectively sealed the wood’s inherent pores and cracks to mitigate degradation effects caused by aging, fungi, and insects. Subsequently, the treated wood surface was modified with an alkaline MTMS-based silica sol to form a functional superhydrophobic protective layer. The modification effectiveness was meticulously analyzed using advanced characterization techniques, including scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The results demonstrated substantial improvements: the modified wood’s water contact angle (WCA) reached 156.0°, and the sliding angle (SA) was 6.0°. Additionally, the modified wood showed a notable reduction in water uptake and moisture absorption, enhancing its dimensional stability. The superhydrophobic surface endowed the wood with excellent self-cleaning properties and robust resistance to pollution. Enhanced mechanical durability of superhydrophobic surface was observed under rigorous testing conditions, including sandpaper abrasion and tape peeling. Furthermore, the modification improved the thermal stability, compressive strength, and storage modulus of the wood. Collectively, these enhancements render this modification a potent methodology for the preservation and functional augmentation of historic architectural woodwork.

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“…The most of milling processes apply high energy amount on sample and can destroy the structure of material. pulverization of cellulose aerogels by means of mechanical grinding [15].…”

Section: Introductionmentioning

confidence: 99%

The effect of pulverization methods on the microstructure of stiff, ductile, and flexible carbon aerogels

et al. 2020

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Carbon aerogels find application in many fields. In most of the applications, they are used as powders and thus need to be pulverized. However, the pulverization could induce various changes in the microstructure of carbon aerogels. The extent of changes depends not only on the dominant forces of used technique, but also on the mechanical and structural properties of initial monolithic samples. In the present work, we discuss the influence of grinding, milling in shaker cryo-mill, and planetary ball mill on stiff, ductile and flexible carbon aerogels. Scanning electron microscopy and transmission electron microscopy images, gas sorption techniques, wide-angle X-ray scattering, and Raman spectroscopy show a strong dependency of the introduced energy amount while pulverization on the structure modification. Results show that stiff carbon aerogels do not undergo noticeable changes. In contrast, ductile carbon aerogels are very sensitive to friction forces. Soft and flexible carbon aerogels undergo drastic changes in the microstructure.

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Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species Eucalyptus sp. and Pinus elliottii

Cited by 7 publications

References 49 publications

Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

Innovative Treatment of Ancient Architectural Wood Using Polyvinyl Alcohol and Methyltrimethoxysilane for Improved Waterproofing, Dimensional Stability, and Self-Cleaning Properties

The effect of pulverization methods on the microstructure of stiff, ductile, and flexible carbon aerogels

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