amorphization of different cellulose samples by ball milling

amorphization of different cellulose samples by ball milling

Amorphization of different cellulose samples by ball ...

Cellulose samples with initially different crystal structures (cellulose I and II) have been found to yield virtually the same amorphous X-ray scattering curves after extensive ball milling (Maier ...

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amorphization by ball milling a review

Amorphization of different cellulose samples by ball milling The optimum parameters for the milling process were ball speed of 350 r/min, solid/liquid ratio of 1:10, raw material particle size with 0.5 mm, and number of balls of 20 (steel ball, Φ = 10 mm ...

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A multitechnique approach to assess the effect of ball ...

Highlights We present the effect induced by a ball milling process on cellulose. The cellulose amorphization and the mean size reduction of the crystallite domains were quantified. Ball milled cellulose shows increased water absorption and reduced thermal stability. The disappearance of the fibrous structure is evidenced as a consequence of the ball milling process.

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Mechanochemistry of zeolites: Part 3. Amorphization of ...

1995-1-1  The samples obtained during ball milling of zeolite ZSM-5 were characterized by different methods such as X-ray diffractometry, scanning-electron microscopy, FTi.r. spectrometry, and simultaneous thermal analysis.The milling caused considerable change of morphological and particulate properties followed by loss of crystallinity of the treated zeolite.

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A multitechnique approach to assess the effect of ball ...

2012-1-4  FTIR analysis is a very useful technique to monitor structural changes undergone by cellulose during chemical and mechanical treatments (Avella et al., 2007, Avella et al., 2008, Princi et al., 2006).Fig. 1 shows normalized ATR-FTIR spectra of neat cellulose and cellulose ball milled at different milling time in those regions in which relevant changes in the spectra were

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(PDF) The glass transition and crystallization of ball ...

Samples of ball milled cellulose were prepared by ball milling pulps from eucalyptus and softwood (spruce/pine). Water sorption isotherms were obtained by both

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Ball milling: a green technology for the preparation and ...

Ball milling: a green technology for the preparation and functionalisation of nanocellulose derivatives Carmen C. Piras, a Susana Fernandez-Prieto´ b and Wim M. De Borggraeve *a Ball milling is a simple, fast, cost-effective green technology with enormous potential.

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Modification of microcrystalline cellulose structural ...

2019-6-27  Abstract This study investigated the characteristics of cellulose Avicel PH-101 (NPA) and Avicel samples treated by either ball milling (BMA) or ionic liquid 1-ethyl-3-methylimidazolium acetate (ILA), which alter cellulose structural properties specifically and, consequently, affect the enzymatic hydrolysis of these materials differently. All materials were submitted to 48 h

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Amorphization of Atorvastatin Calcium by Mechanical ...

2017-4-11  The structural changes of crystalline atorvastatin upon high-energy ball milling at room temperature have been studied. The study investigates the effect of polyvinylpyrrolidone (PVP) and hydroxypropylmethyl cellulose (HPMC) polymeric matrix on stabilizing amorphous atorvastatin before and after storage under ambient and elevated humidity conditions. The

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Ball Milling Pretreatment of Corn Stover for Enhancing the ...

2010-7-1  Ethanol can be produced from lignocellulosic biomass with the usage of ball milling pretreatment followed by enzymatic hydrolysis and fermentation. The sugar yields from lignocellulosic feed stocks are critical parameters for ethanol

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(PDF) Crystalline transformation of native cellulose from ...

The main problem of using ball milling for the amorphization of cellulose is the high cost of this process, estimated at $10-15 per kg. ... The NC samples obtained from direct ball milling and ...

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A multitechnique approach to assess the effect of ball ...

2012-1-1  This paper presents a detailed analysis of effect induced by a dry ball milling process on cellulose structure, morphology and properties. The partial amorphization of cellulose was qualitatively estimated by ATR-FTIR analysis. Through WAXD analysis the crystallinity index and the mean size of the cellulose crystallite domains were calculated ...

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Roles of Ball Milling Pretreatment and Titanyl Sulfate in ...

2 天前  Production of 5-hydroxymethylfurfural (HMF) from cellulose has been expected for a long time, but most catalytic systems generally give low yield and selectivity due to the difficulty of balancing cellulose deconstruction with the uncontrollable degradation of the target product under harsh conditions. Here we show that the ball milling pretreatment could markedly facilitate the

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Solid-state amorphization of rebamipide and investigation ...

Solid-state amorphization of crystalline rebamipide (RBM) was realized by ball milling and spray drying. The amorphous content of samples milled for various time was quantified using X-ray powder diffraction. Crystalline RBM and three amorphous RBM obtained by milling and spray drying were character

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Ball milling: a green technology for the preparation and ...

Ball milling: a green technology for the preparation and functionalisation of nanocellulose derivatives Carmen C. Piras, a Susana Fernandez-Prieto´ b and Wim M. De Borggraeve *a Ball milling is a simple, fast, cost-effective green technology with enormous potential.

More

Amorphization of Atorvastatin Calcium by Mechanical ...

2017-4-11  The structural changes of crystalline atorvastatin upon high-energy ball milling at room temperature have been studied. The study investigates the effect of polyvinylpyrrolidone (PVP) and hydroxypropylmethyl cellulose (HPMC) polymeric matrix on stabilizing amorphous atorvastatin before and after storage under ambient and elevated humidity conditions. The

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Effect of ball-milling on crystallinity index, degree of ...

2018-12-1  The extent of this decrease was different for all samples: acid-washed cellulose was the most affected, and after two hours its DP dropped to 192; Sigmacell 20 was the least affected, reaching 218 after two hours of milling; microcrystalline cellulose remained the least polymerized at all milling times, dropping from 114 to 102 (10%).

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Choosing the right strategy: cryogrinding vs. ball milling ...

milling, etc.6–8 Mechanochemistry of insoluble (in traditional organic solvents) chitin polymer9 is an efficient route to its particle size reduction and amorphization; however, the terms “milling” and “grinding” thus far have been applied for relatively high-energy ball-milling (BM). The high number

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Amorphization of Indomethacin by Co-Grinding with

2006-8-23  Purpose To quantify the effects of the ratio of indomethacin to Neusilin US2 and the processing humidity on the amorphization kinetics, stability and nature of the interaction. Materials and Methods A porcelain jar mill with zirconia balls was used to affect conversion of the physical mixtures (48 g) of indomethacin and Neusilin US2 (in the ratios 1:1 to 1:5) to amorphous

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Polymers Free Full-Text Preparation, Characterization ...

2021-12-9  The main problem of using ball milling for the amorphization of cellulose is the high cost of this process, estimated at $ 10–15 per kg. In addition, the obtained amorphized cellulose has an unstable phase state and recrystallizes in a humid atmosphere or aqueous medium [ 36 ].

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Solid-state amorphization of rebamipide and investigation ...

Solid-state amorphization of crystalline rebamipide (RBM) was realized by ball milling and spray drying. The amorphous content of samples milled for various time was quantified using X-ray powder diffraction. Crystalline RBM and three amorphous RBM obtained by milling and spray drying were character

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Ball milling: a green technology for the preparation and ...

Ball milling: a green technology for the preparation and functionalisation of nanocellulose derivatives Carmen C. Piras, a Susana Fernandez-Prieto´ b and Wim M. De Borggraeve *a Ball milling is a simple, fast, cost-effective green technology with enormous potential.

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Effect of ball-milling on crystallinity index, degree of ...

2022-1-1  63 0.53 to 0.15, but are not sufficient to achieve total amorphization. Schenzel and co-workers 64 (Schenzel et al., 2005) obtained a totally amorphous cellulose after 30 hours of milling, and 65 mixed amorphous and un-milled cellulose to

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Atmosphere effects of the amorphization reaction in

K. Aoki, A. Memezawa , and T. Masumoto: Atmosphere effects of th e amorphization reaction in NiZr by bal l milling 2 MPa) atmospheres. Structures of th e samples before and after milling were identified by means of x-ray diffractometry (XRD) using CuKa radiation with a graphite monochromator. The amorphou s nature of the

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Properties of cellulose nanofibril produced from wet ball ...

2022-1-9  Ball Milling. Cellulose materials were wet ball-milled with a PQ-N2 planetary ball mill (Livingston, NJ, USA). The enzymatically treated fibers were diluted to 1.0 wt% and then agitated by a mechanical blender for 10 min. Then 150 g of the diluted fibril slurry were put into an agate jar of 500 mL capacity.

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Choosing the right strategy: cryogrinding vs. ball milling ...

milling, etc.6–8 Mechanochemistry of insoluble (in traditional organic solvents) chitin polymer9 is an efficient route to its particle size reduction and amorphization; however, the terms “milling” and “grinding” thus far have been applied for relatively high-energy ball-milling (BM). The high number

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BJOC - Mechanochemical amorphization of chitin: impact

2019-3-5  Figure 1: CrI% for chitin samples, before and after milling in a jar with one ball made of SS, ZrO 2, Cu, Al, brass, WC, PMMA, PTFE. One series has ball mass = 2 g (blue) and one ball diameter = 9.5 mm (in orange). Experimental

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Structural changes and enhanced accessibility of natural ...

2013-10-29  A kind of natural cellulose, bleached pine pulp (BPP), was pretreated by mechanical activation (MA) using a self-designed stirring ball milling. The effect of MA pretreatment on the dissolving capacity and molecular chain structure of BPP were investigated by the determination of alkaline solubility (Sa) and degree of polymerization (DP). In addition, the changes in crystal

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Amorphization of Indomethacin by Co-Grinding with

2006-8-23  Purpose To quantify the effects of the ratio of indomethacin to Neusilin US2 and the processing humidity on the amorphization kinetics, stability and nature of the interaction. Materials and Methods A porcelain jar mill with zirconia balls was used to affect conversion of the physical mixtures (48 g) of indomethacin and Neusilin US2 (in the ratios 1:1 to 1:5) to amorphous

More