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fine grinding (Qing et al. 2013). In particular, high-pressure homogenization is regarded as one of the most effective ways because it can generate strong mechanical shearing forces acting on fibers entrained inflows with high velocity under high pressure in a microchannel to initiate the fibrillation of the fibers (Missoum et al. 2013).
Influence . of . drying method . on . the material properties . of . ... grinding or high-pressure homogenizing action pro ... on the crystallinity of dissolving-grade sulphite pulp was studied by Kouris et al. (1958). The drying methods included air drying, oven drying, freeze drying and freeze drying with a series of solvent ...
The narrowing of the Sol-gel 0 224 X-ray peaks (i.e. better crystallization) is correlated with an 1 143 increase in the crystallite size, deduced using the Scherrer 5 63 formula on the (111) X-ray peak, which varies from around 10 p ˚ after 1 h of grinding to 80 A ˚ after 8 h of grinding.
XRD Characterization of Crystallinity of Human Tooth Enamel under Influence of Mechanical Grinding . By Jose Reyes-gasga, Olga Koudriavtseva, Raul Herrera-becerra and Arturo bosa. Abstract. Crystallinity refers to the degree of structural order in a solid and has a big influence on hardness, density, transparency and diffusion. Even within ...
a result of a reduction in chain-induced crystallinity, and a reduction in interchain bonding forces. 15.15 Briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) Molecular weight (b) Degree of crystallinity
Membranolytic effects of monosodium urate monohydrate: influence of grinding. Burt HM, Evans E, Lam EW, Gehrs PF, Herring FG. ... Increasing grinding times caused a decrease in both the crystallinity and zeta potential of the samples, a decrease in percent hemolysis values and a change in the distribution of free and bound spin label ...
Co-crystals can be prepared by solvent and solid based methods. The solvent-based methods involve slurry conversion solvent evaporation, cooling crystallization and precipitation. The solid based methods involve net grinding; solvent-assisted grinding and sonication (applied to either to wet or dry solid mixtures) 80° to 85°.
Influence of grinding on graphite crystallinity from experimental and natural data: Implications for graphite thermometry and sample preparation December 2006 Mineralogical Magazine 70(6):697-707
Tacticity and crystallinity is important in the polymer synthesis industry. Different polymerisation conditions such as temperature and choice of solvent will affect the tacticity of the polymer formed [4]. If a polymer of high strength is required, there is a …
LGPS solid electrolyte is prepared by the mechan ical ball grinding and pressing sintering process under an inert environment of isolated oxygen and water. Since the sintering temperature of solid-state sintering method can influence the crystallinity of the si ntered materials, and result in the change of the
@article{osti_5421702, title = {Effect of crystallinity and degree of polymerization of cellulose on enzymatic saccharification}, author = {Puri, V P}, abstractNote = {Lignocellulose materials were pretreated by methods known to improve enzymatic saccharification, and the percentage crystallinity (x-ray diffraction) and degree of polymerization were measured.
The specific enthalpy of fusion determined, 'h, the degree of crystallinity below the glass transition, α c, the step heights of the glass transitions, Δc p, and the glass transition temperatures, T g, are listed in the following table. As has already been shown in Section 3.1.2 the degree of crystallinity, Dc, is calculated from the equation
A study was made of an effect previously noted, that grinding cotton fibers in a Wiley mill causes a reduction in degree of crystallinity as determined by the acid-hydrolysis method. It is shown on...
Here, we explore the influence of energetic driving force and local crystallinity on the efficiency of charge pair generation at hybrid organic:inorganic semiconductor heterojunctions.
The X-ray diffraction patterns demonstrated the crystallinity and the intensity of the peak in superfine GS powders. Conclusion: The present study suggests that ultrafine grinding treatments influence the structures and physicochemical properties of GS powders, and such changes would improve the effective utilization of GS in the food or feed ...
One of the most recent trends in industrial grinding is the use of customized grinding wheels, with the need to completely characterize abrasive grains and bond behavior. Thus, the main goal of the present research work was to evaluate the influence of the crystalline structure of abrasive grains on both the topography and wear of the grinding wheel. To this end, we analyzed vitrified …
Crystallinity refers to the degree of structural order in a solid and has a big influence on hardness, density, transparency and diffusion. Even within materials that are crystalline completely, the degree of structural perfection can vary, reflecting size and elastic strain of many independent crystalline regions (grains or crystallites) of which these materials are composed.
The crystallinity of talc decreased upon grinding, and the degree of decrease varied depending on the ball size (Figure 10a). When 1 mm and 2 mm balls were used in grinding, the crystallinity decreased rapidly within 60 min of grinding, and delamination of (00l) planes mainly occurred. After 120 min of grinding, almost all XRD peaks disappeared.
Water uptake of poly(2-N-alkyl-2-oxazoline)s: influence of crystallinity and hydrogen-bonding on the mechanical properties Erik F.-J. Rettler, abcd Hanneke M. L. Lambermont-Thijs, a Johannes M. Kranenburg, ab Richard Hoogenboom, ab Miriam V. Unger, e …
Influence of Crystallinity of Lithium Thiophosphate Solid Electrolytes on the Performance of Solid-State Batteries. Shuo Wang, Institute of Physical Chemistry & Center for Materials Research, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, Giessen, D-35392 Germany.
Influence of grinding on graphite crystallinity from experimental and natural data: implications for graphite thermometry and sample preparation
influence of grinding and ultrasound treatment on talc from a new deposit, Gemerska´ Poloma, in Slovakia. ... acidic media led to a lower degree of crystallinity whereas
Crystallinity can be accurately measured by X-ray diffraction and less accurately but simply by specific gravity. The properties of PCTFE vary with the degree of crystallinity. Table 13.3 contains properties of two resins with different specific gravities. The crystalline resin, one with the higher specific gravity, has higher tensile yield strength and flexural modulus than the amorphous plastic.
The crystallinity percentage, X cr, is given by: (6) Although this method is widely used, it has major limitations. For samples with preferred grain orientation, the peak intensity for a specific direction is intensified leading to significant errors in the calculation. In powders, this effect could be limited by reducing the size by grinding.
Different crystal structures such as martensite, austenite, bainite, and ferrite have different densities and affect crystallinity. The influence of chemical composition elements Due to the different chemical compositions of iron, carbon, chromium, manganese, sulfur, and phosphorus contained in the finished steel ball, its hardness and impact ...
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This work aimed to determine the influence of superfine grinding on the physicochemical properties of bulbs of Fritillaria unibracteata Hsiao et K.C. Hsia (BFU) powder. For this purpose, fine powder (FP) and two superfine powders (SPs) were obtained via superfine and conventional grinding methods.
The influence of spacer composition on thermomechanical properties, crystallinity, and morphology in ionene segmented copolymers† Nicholas T. Liesen, ‡ a Meng Wang, ‡ b Mehrnoosh Taghavimehr, ‡ c Jae Sang Lee, d Reza Montazami, * c Lisa M. Hall * a and Matthew D. Green * d
This paper examines the effects of shear stress on the structuralparameters that define the 'crystallinity' of graphite. The results show that highly crystalline graphite samples ground for up to 120 min do not undergo detectable changes in the three-dimensional arrangement of carbon layers but crystallite sizes (Lc and La) decrease consistently with increasing grinding time.
Full Article. INFLUENCE OF CELLULOSE POLYMERIZATION DEGREE AND CRYSTALLINITY ON KINETICS OF CELLULOSE DEGRADATION. Edita Jasiukaitytė-Grojzdek,*,a,b Matjaž Kunaver, a,b Ida Poljanšek, a,c Cellulose was treated in ethylene glycol with p-toluene sulfonic acid monohydrate as a catalyst at different temperatures.At the highest treatment temperature (150 °C) liquefaction of wood …
Effects of dry grinding on two kaolins of different degrees of crystallinity - Volume 26 Issue 4
Influence of grinding on graphite crystallinity from experimental and natural data: implications for graphite thermometry and sample preparation Crespo,E. et al. Mineralogical Magazine (2006),70(6):697
Influence of process parameters on breakage kinetics and grinding limit at the nanoscale Catharina Knieke, Institute of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen D-91058, Germany
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