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Добірка наукової літератури з теми "Ligno-cellulosic materials"

Автор: Grafiati
Опубліковано: 10 січня 2023
Оновлено: 29 січня 2023

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Статті в журналах з теми "Ligno-cellulosic materials"

1

Doineau, Estelle, Fleur Rol, Nathalie Gontard, and Hélène Angellier-Coussy. "Physical-Chemical and Structural Stability of Poly(3HB-co-3HV)/(ligno-)cellulosic Fibre-Based Biocomposites over Successive Dishwashing Cycles." Membranes 12, no. 2 (January 21, 2022): 127. http://dx.doi.org/10.3390/membranes12020127.

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In order to lengthen the life cycle of packaging materials, it is essential to study their potential for reuse. This has been never carried out for emerging bio-based and biodegradable materials such as PHBV/(ligno-)cellulosic fibre-based biocomposite materials. This work therefore highlights the impact of successive dishwashing cycles on the physical-chemical and structural stability of such materials. Several parameters were considered to assess this stability, such as the visual aspect and colour, the microstructure, the thermal and tensile properties, and the overall migration in food liquid simulants. The effect of fibre composition, morphology, and content was investigated by selecting three types of commercial (ligno-)cellulosic fibres and two filler contents (20 and 40 wt%). A great potential for reuse of PHBV films was highlighted by their high stability after up to at least 50 dishwashing cycles. However, the addition of (ligno-)cellulosic fillers negatively impacts the stability of PHBV-based materials, especially due to the hygroscopic behaviour of (ligno-)cellulosic fillers and the heterogenous microstructure of biocomposites, with at best up to 10 possible dishwashing cycles for ultra-pure cellulose. In conclusion, reuse including dishwashing steps can be considered for neat PHBV materials, while this should be prohibited for PHBV/(ligno-)cellulosic fibre-based biocomposite materials.
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2

Suteu, Daniela, Irina Volf, and Matei Macoveanu. "LIGNO - CELLULOSIC MATERIALS FOR WASTEWATER TREATMENT." Environmental Engineering and Management Journal 5, no. 2 (2006): 119–34. http://dx.doi.org/10.30638/eemj.2006.010.

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3

Stan, Loredana, Irina Volf, Corneliu S. Stan, Cristina Albu, Adina Coroaba, Laura E. Ursu, and Marcel Popa. "Intense Blue Photo Emissive Carbon Dots Prepared through Pyrolytic Processing of Ligno-Cellulosic Wastes." Nanomaterials 13, no. 1 (December 27, 2022): 131. http://dx.doi.org/10.3390/nano13010131.

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In this work, Carbon Dots with intense blue photo-luminescent emission were prepared through a pyrolytic processing of forestry ligno-cellulosic waste. The preparation path is simple and straightforward, mainly consisting of drying and fine grinding of the ligno-cellulosic waste followed by thermal exposure and dispersion in water. The prepared Carbon Dots presented characteristic excitation wavelength dependent emission peaks ranging within 438–473 nm and a remarkable 28% quantum yield achieved at 350 nm excitation wavelength. Morpho-structural investigations of the prepared Carbon Dots were performed through EDX, FT-IR, Raman, DLS, XRD, and HR-SEM while absolute PLQY, steady state, and lifetime fluorescence were used to highlight their luminescence properties. Due to the wide availability of this type of ligno-cellulosic waste, an easy processing procedure achieved photo-luminescent properties, and the prepared Carbon Dots could be an interesting approach for various applications ranging from sensors, contrast agents for biology investigations, to photonic conversion mediums in various optoelectronic devices. Additionally, their biocompatibility and waste valorization in new materials might be equally good arguments in their favor, bringing a truly “green” approach.
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4

Kersten, Sascha, and Manuel Garcia-Perez. "Recent developments in fast pyrolysis of ligno-cellulosic materials." Current Opinion in Biotechnology 24, no. 3 (June 2013): 414–20. http://dx.doi.org/10.1016/j.copbio.2013.04.003.

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5

Venkata Prasad, C., K. Chowdoji Rao, G. Venkata Reddy, T. Sobha Rani, B. Yerriswamy, and M. C. S. Subha. "Characteristic Studies of Ligno-Cellulosic FabricGrewia tenax." Journal of Natural Fibers 7, no. 3 (August 27, 2010): 194–215. http://dx.doi.org/10.1080/15440478.2010.504048.

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6

Pareek, S., S. K. Kim, S. Matsui, and Y. Shimizu. "Hydrolysis of (ligno)cellulosic materials under sulfidogenic and methanogenic conditions." Water Science and Technology 38, no. 2 (July 1, 1998): 193–200. http://dx.doi.org/10.2166/wst.1998.0137.

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A Biochemical methane potential (BMP) test and Serum Bottle Reactor (SBR) test were used to compare hydrolysis (mineralization) of lignocellulosic materials under sulfidogenic and methanogenic conditions. Lignocellulosic carbon mineralization under sulfidogenic conditions was found to be more than 2 times higher than under methanogenic conditions. The percentages of lignocellulosic carbon mineralized under methanogenic condition were 18.0% and 10.71% while under sulfidogenic conditions 36.69% and 27.44% for office paper and newspaper, respectively. Although a poor linear relationship between the percentage of carbon mineralization and percentage lignin content was observed, but in general a decrease in mineralization of lignocellulosic carbon was observed with the increase in lignin content. A method based on selective inhibition of microorganism activity, by 3% toluene, was used to measure the initial rate of lignocellulosic material mineralization and the accumulation of mineralized products (i. e. sugars). Sugars linearly accumulated over time and the accumulation rates of glucose and xylose were calculated. The accumulation rates of glucose under methanogenic condition were 1.302, μM/g-dry wt hr and 0.004, μM/g-dry wt hr while under sulfidogenic condition they were 2.624, μM/g-dry wt hr and 2.279 μM/g-dry wt hr for offce and newspaper, respectively.
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7

Bakirtzis, D., M. A. Delichatsios, S. Liodakis, and W. Ahmed. "Fire retardancy impact of sodium bicarbonate on ligno-cellulosic materials." Thermochimica Acta 486, no. 1-2 (March 2009): 11–19. http://dx.doi.org/10.1016/j.tca.2008.12.012.

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8

Sîrghie, Cecilia, Adina-Maria Bodescu, Alexandru Botar, Artur Cavaco-Paulo, and Florentina-Daniela Munteanu. "Characterization of ligno-cellulosic materials bleached with oxo-diperoxo-molybdates." Carbohydrate Polymers 98, no. 1 (October 2013): 490–94. http://dx.doi.org/10.1016/j.carbpol.2013.06.021.

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9

Prasad, C. Venkata, K. Chowdoji Rao, G. Venkata Reddy, Yong-Ha Kim, T. Shobha Rani, and M. C. S. Subha. "A study on ligno-cellulosic fabricHardwikia binata." Journal of Applied Polymer Science 115, no. 5 (March 5, 2010): 2806–12. http://dx.doi.org/10.1002/app.30571.

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10

Ibrahim, N. A., A. Amr, B. M. Eid, and Z. M. El-Sayed. "Innovative multi-functional treatments of ligno-cellulosic jute fabric." Carbohydrate Polymers 82, no. 4 (November 2010): 1198–204. http://dx.doi.org/10.1016/j.carbpol.2010.06.055.

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Більше джерел

Дисертації з теми "Ligno-cellulosic materials"

1

Mills, Ryan Harris. "Development of a Ligno-Cellulosic Polymeric and Reinforced Sheet Molding Compound (SMC)." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/MillsRH2009.pdf.

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2

Thomas, Ananya. "Thermal and calorimetric evaluations of some bio-inspired fire-resistant coatings for ligno-cellulosic materials." Thesis, 2020. https://vuir.vu.edu.au/40844/.

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Анотація:
Through the current project, we have investigated the passive fire protection efficiency of some bio-inspired substrates, which included: β-cyclodextrin, dextran, potato starch, agar agar, tamarind, chitosan, rice bran and fish gelatin. In an attempt to enhance the passive fire protection attributes of these substrates, we prepared formulations of these with both inorganic and organic compounds, the latter included some phosphorus-containing compounds with the phosphorus atom in different chemical environments and oxidation states. Here we have also explored both the reactive and additive strategies. The degrees of functionalization were primarily gauged from inductively-coupled plasma/optical emission spectroscopy (ICP-OES), 31P solid-state Nuclear Magnetic Resonance Spectroscopy (NMR). We also chose several thermal and calorimetric techniques for evaluating the efficacies of such formulations, such as: thermo-gravimetric analysis (TGA), pyrolysis combustion flow calorimetry (PCFC), a proprietary ignition propensity test and cone calorimetry. In addition, with a view to deciphering the elements of condensed phase mechanism, we carried out an estimation of the extents of phosphorus retention in the char residues (using ICP-OES) and chemical nature of the char residues (via solid-state NMR and Raman spectroscopies) that were obtained through the cone calorimetric runs. The unmodified counterparts were also subjected to the same set of analyses with a view to serving as controls. We also endeavoured to analyse the gaseous volatile fragments emanating from some of the additives using, either by employing gas chromatography/mass spectrometry (GC/MS), or pyrolysis-GC/MS, technique. Phosphorus analyses, primarily, through ICP-OES on the recovered samples showed different degrees of incorporation. Such observations were verified through solid-state 31P NMR spectroscopy. The thermograms of the modified substrates were noticeably different from the unmodified counterparts, both in terms of the general profiles and the amounts of char residues produced. Such observations correlated well with the relevant parameters obtained through the PCFC runs. Furthermore, we have carried out a detailed kinetic analyses of the thermograms of the unmodified substrates, obtained at different heating rates, using the Flynn Wall Ozawa (FWO) method, and through a proprietary software developed by our research group (SB method). We have also endeavoured to seek correlations, if any, among the various empirical parameters that were collated through the different test methods. Overall, the modified systems containing phosphorus were found to be less combustible than the parent substrates, and thus can be considered as promising base matrices for environmentally-benign fire resistant coatings. With a view to understanding the overall flammability profiles, optionally, in some of the formulations, initially we screened them through an ignitability propensity test that was developed in our laboratories. This was followed by cone calorimetric measurements on Radiata Pine plaques, particularly, coated with potato starch, chitosan, chitin, rice bran and fish gelatin. The results from the cone tests indicated that formulations based on fish gelatin endowed with the best fire protection property, followed by chitosan, whereas potato starch and rice bran seem to be ineffective as fire proofing agents.
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Частини книг з теми "Ligno-cellulosic materials"

1

Barbu, Marius C., Roman Reh, and Mark Irle. "Wood-Based Composites." In Materials Science and Engineering, 1038–74. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1798-6.ch041.

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Анотація:
Wood composites are made from various wood or ligno-cellulosic non-wood materials (shape and origin) that are bonded together using either natural bonding or synthetic resin (e.g. thermoplastic or duroplastic polymers), or organic- (e.g. plastics)/inorganic-binder (e.g. cement). This product mix ranges from panel products (e.g., plywood, particleboard, strandboard, or fiberboard) to engineered timber substitutes (e.g., laminated veneer lumber or structural composite lumber). These composites are used for a number of structural and nonstructural applications in product lines ranging from interior to exterior applications (e.g. furniture and architectural trim in buildings). Wood composite materials can be engineered to meet a range of specific properties. When wood materials and processing variables are properly selected, the result can provide high performance and reliable service. Laminated composites consist of wood veneers bonded with a resin-binder and fabricated with either parallel- (e.g. Laminated Veneer Lumber with higher performance properties parallel to grain) or cross-banded veneers (e.g. plywood, homogenous and with higher dimensional stability). Particle-, strand-, or fiberboard composites are normally classified by density (high, medium, low) and element size. Each is made with a dry woody element, except for fiberboard, which can be made by either dry or wet processes. Hybrid composites based on wood wool, particles, and floor mixed with cement or gypsum are used in construction proving high weathering and fire resistance in construction. The mixture with plastics (PP or PE) and wood floor open a new generation of injected or molded Wood Plastic Composites (WPC), which are able to substitute plastics for some utilizations. In addition, sandwich panels with light core made from plastic foams or honeycomb papers are used in the furniture industry.
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2

Sunday Noah, Akpan. "Oil Palm Empty Fruit Bunches (OPEFB) – Alternative Fibre Source for Papermaking." In Elaeis guineensis. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.98256.

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Анотація:
Elaeis guineensis (oil palm) is one of the most economical perennial oil crops for its valuable oil-producing fruits in tropical regions such as West Africa and South-East Asia. During oil extraction process, these fruits are usually stripped from the fruit bunches leaving behind empty bunches to be discarded as residues. Thus, empty fruit bunches (EFB) of Elaeis guineensis are usually considered as waste in the oil palm industry. The abundance of oil palm empty fruit bunches (OPEFB) has created enormous environmental issue, ranging from fouling, attraction of pests, greenhouse gas emissions to soil acidification, thus posing very serious threats to humans and the environment. Globally, in 2014 alone, over 22.4 million tons of EFB were estimated to have been produced. Therefore, exploring eco-friendly disposal methods and productive utilisation of oil palm EFB as alternative fibrous material for papermaking becomes imperative in converting waste to wealth, and initiating environmental wellness. Elaeis guineensis empty fruit bunch (EFB) fibre on the average measures 0.99 μm in length, while the fibre diameter and cell wall thickness are 19.1 μm and 3.38 μm respectively. Fibres of EFB are of ligno-cellulosic materials, consisting on the average of an estimated cellulosic content of 30–50%, 15–35% of hemicelluloses and the lignin constituting about 20–30% of extractive-free fibre. The rich cellulose base of EFB fibre makes Elaeis guineensis a good potential resource for papermaking furnish moreso that the pulp and paper industry is often referred to as the cellulose industry. Every 5 tons of EFB gives 1 ton of pulp for papermaking. This book chapter will therefore attempt to examine the fibre morphological characteristics of oil palm empty fruit bunch, the chemical properties of EFB fibre, papermaking potentials of empty fruit bunches and ultimately their impact on the environment.
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3

Barbu, Marius C., Roman Reh, and Mark Irle. "Wood-Based Composites." In Research Developments in Wood Engineering and Technology, 1–45. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4554-7.ch001.

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Анотація:
Wood composites are made from various wood or ligno-cellulosic non-wood materials (shape and origin) that are bonded together using either natural bonding or synthetic resin (e.g. thermoplastic or duroplastic polymers), or organic- (e.g. plastics)/inorganic-binder (e.g. cement). This product mix ranges from panel products (e.g., plywood, particleboard, strandboard, or fiberboard) to engineered timber substitutes (e.g., laminated veneer lumber or structural composite lumber). These composites are used for a number of structural and nonstructural applications in product lines ranging from interior to exterior applications (e.g. furniture and architectural trim in buildings). Wood composite materials can be engineered to meet a range of specific properties. When wood materials and processing variables are properly selected, the result can provide high performance and reliable service. Laminated composites consist of wood veneers bonded with a resin-binder and fabricated with either parallel- (e.g. Laminated Veneer Lumber with higher performance properties parallel to grain) or cross-banded veneers (e.g. plywood, homogenous and with higher dimensional stability). Particle-, strand-, or fiberboard composites are normally classified by density (high, medium, low) and element size. Each is made with a dry woody element, except for fiberboard, which can be made by either dry or wet processes. Hybrid composites based on wood wool, particles, and floor mixed with cement or gypsum are used in construction proving high weathering and fire resistance in construction. The mixture with plastics (PP or PE) and wood floor open a new generation of injected or molded Wood Plastic Composites (WPC), which are able to substitute plastics for some utilizations. In addition, sandwich panels with light core made from plastic foams or honeycomb papers are used in the furniture industry.
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Тези доповідей конференцій з теми "Ligno-cellulosic materials"

1

Wijaya, Mohammad, Erliza Noor, Tun Tedja Irawadi, and Gustan Pari. "Thermodynamic study on ligno-cellulosic pyrolysis on wood materials." In 2ND INTERNATIONAL CONFERENCE ON CHEMISTRY, CHEMICAL PROCESS AND ENGINEERING (IC3PE). Author(s), 2018. http://dx.doi.org/10.1063/1.5065000.

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