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Showing 1 to 13 of 13 for “"CRYSTALLINITY INDEX"”.
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ΜΕΛΕΤΗ ΤΟΥ ΜΗΧΑΝΙΣΜΟΥ ΠΡΟΚΑΤΕΡΓΑΣΙΑΣ ΓΙΑ ΤΗΝ ΜΕΤΑΤΡΟΠΗ ΤΗΣ ΒΙΟΜΑΖΑΣ ΣΕ ΚΑΥΣΙΜΑ ΚΑΙ ΧΗΜΙΚΑ: ΕΠΙΔΡΑΣΗ ΣΤΗ ΣΤΕΡΕΑ ΦΑΣΗ
… ON THE PARTICLE SIZE, SPECIFIC SURFACE AREA, CRYSTALLINITY INDEX, CHEMICAL COMPOSITION, DENSITY OF WHEAT STRAW IS EXAMINED. THE PHYSICAL PRETREATMENTS STUDIED WERE HAMMER - AND BALL-MILLING. THE CHEMICAL PRETREATMENTS UTILIZED WERE DELIGNIFICATIONS WITH AQUEOUS ALKALINE SOLUTIONS (NAOH, KOH, …
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Investigação de redução da cristalinidade da celulose sob a influência de diferentes misturas eutéticas.
… that regulate cellulose access, such as the crystallinity index. Thus, reducing the crystallinity of cellulose is not a trivial process, due to its supramolecular structure which prevents the process from being carried out in conventional solvents. This work studied the reduction of the …
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Lignocellulose Saccharification via Cellulose Solvent Based Fractionation Followed by Enzymatic Hydrolysis: the Last Obstacle to Integrated Biorefineries
… (i.e., one FPU of cellulase per gram of glucan). Crystallinity index (CrI) measurements by X-ray diffraction (XRD) and cross polarization/magic angle spinning (CP/MAS) ¹³C nuclear magnetic resonance (NMR), and cellulose accessibility to cellulase (CAC) determinations of COSLIF-pretreated biomass …
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Effect of intermediate solvents on poly(ether ether ketone)
… PEEK films was produced. Each film had a certain crystallinity index and crystal morphology, as revealed by optical microscopy, differential scanning calorimetry (DSC), and wide angle X-ray scattering (WAXS). Dynamic solvent uptake measurements were performed on each film with the three solvents. …
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Shear controlled orientation effects with injection mouldings produced by the SCORIM process
… shears and the corresponding values of a-phase index, crystallinity index and percentage crystallinity. The values of each increasing proportionally with the length of time used. Microhardness characterisation revealed anisotropy within SCORIM samples consistent with preferred orientation and …
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Biomass pretreatment toward efficient hydrolysis for sustainable biofuel applications
… efficiency is also elucidated. Although the crystallinity index (CrI) of cellulose decreases as the severity increases, significant non-specific degradation and low yield of cellulose was observed at high severity. A new method for cellulose CrI determination has been developed with least …
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Pulsed electric field pretreatment of lignocellulose biomass for maximum fermentable sugar yield
… the flax straw pre and post-pretreatment, while crystallinity index measurements revealed unchanged cellulose crystallinity due to PEF pretreatment. Scanning electron microscopy (SEM) images displayed a more porous surface in the pretreated flax straw. BET analysis demonstrated a 91% increase in …
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Silica diagenesis and its pore-scale influence on the characteristics of the upper and lower Bakken shales, Williston Basin, North Dakota and Montana
… FE-SEM and XRD analysis paired with quartz crystallinity index calculations assisted in determining the nature and extent of silica diagenesis in each sample. Finally, the nitrogen physisorption technique was used to measure differences in pore volume and surface area between samples. XRF …
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The influence of different chemical treatments on the mechanical properties of hemp fibre-filled polymer composites
… by modifying the chemical nature of a high crystallinity hemp yarn through chemical treatments such as alkalization, silanization (3-aminopropyltriethoxysilane) and a maleic anhydride treatment. The effectiveness of the chemical treatments was assessed by means of XRD, FTIR and TGA. Density …
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Performance of Hemp-Fibre Reinforced Polypropylene Composite Materials
… resulted in increases in the hemp fibre crystallinity index. TGA and DTA analysis showed that the alkali fibre treatments improved the thermal stability of the treated hemp fibre when compared to the untreated fibre. Alkali treated hemp fibre, polypropylene and a maleic anhydride modified …
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Bio-composites materials from engineered natural fibres for structural applications
… found that these treatments lead to a higher crystallinity index and improved thermal stability of fibres. Fibre alignment in fibre mats produced using a DSF was observed using light microscopy. Visual observation supported that the fibre alignment had occurred. Fibre orientation factors (Kɵ) …
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Processing of Hemp Fibre Using Enzyme/Fungal Treatment for Composites
… was carried out to assess modification of the crystallinity of fibres and the results showed hemp fibre crystallinity index increased in all treated fibres. Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) were used to obtain the activation energies and relative thermal …
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The sedimentology, geochemistry and diagenesis of West Rand Group sediments in the Heidelberg area, Transvaal
… shelf and possibly fluvial processes. The Weber crystallinity index indicates that the mineral assemblage (white mica, chlorite and quartz) are low grade. The West Rand Group's Hb(rel) value of 150 corresponds to an approximate temperatures of 290°C. The study areas baric constraints are similar …