Carboxymethyl cellulose/silica hybrids as templates for calcium phosphate biomimetic mineralization

Salama, Ahmed; Abou-Zeid, Ragab E.; El‐Sakhawy, Mohamed; El-Gendy, Ahmed A.

doi:10.1016/j.ijbiomac.2014.11.041

Cited by 33 publications

(19 citation statements)

References 37 publications

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“…Chemical modification of renewable polysaccharides is an important technique to modify their properties to make them suitable for specific applications. 1 Carboxymethyl cellulose (CMC) is the most important cellulose derivative. It is a non-toxic water soluble heteropolysaccharide derived from cellulose with high molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Carboxymethyl Cellulose Acetate Butyrate

El‐Sakhawy¹,

Cellulose²,

Tohamy³

et al. 2019

Cellulose Chem. Technol.

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From α-cellulose extracted from sugar cane bagasse, carboxymethyl cellulose (CMC), carboxymethyl cellulose acetate (CMCA) and carboxymethyl cellulose acetate butyrate (CMCAB) have been prepared, characterized and evaluated by TGA and DSC. TGA decomposition curves of CMCAB showed three decomposition stages, while cellulose, CMC and CMCA revealed two decomposition stages. The TGA of cellulose and CMC showed residual weight of 19.6 and 34.2%, respectively, at 600 °C, which indicates the presence of a fraction of non-volatile components. Meanwhile, the residual weight of CMCA and CMCAB was very low, which indicates their high purity. The activation energy and thermal stability of CMCAB were higher than those of the other derivatives due to the decomposition of the amorphous part during the modification. The DSC curves showed that CMCAB is a glassy thermoplastic material with glass transition temperature of 138.35 °C, whereas endothermic melting was found at 200 °C.

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Section: Introductionmentioning

confidence: 99%

Thermal Properties of Carboxymethyl Cellulose Acetate Butyrate

El‐Sakhawy¹,

Cellulose²,

Tohamy³

et al. 2019

Cellulose Chem. Technol.

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“…Salama, et al studied the mineralization of CMC/silica hybrids [35]. However, besides a few water-soluble cellulose derivatives that are available on a commercial scale [26], the number of specific and tailor-made additives for calcium phosphate precipitation is still rather limited.…”

Section: Introductionmentioning

confidence: 99%

Water-Soluble Cellulose Derivatives Are Sustainable Additives for Biomimetic Calcium Phosphate Mineralization

et al. 2016

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Abstract:The effect of cellulose-based polyelectrolytes on biomimetic calcium phosphate mineralization is described. Three cellulose derivatives, a polyanion, a polycation, and a polyzwitterion were used as additives. Scanning electron microscopy, X-ray diffraction, IR and Raman spectroscopy show that, depending on the composition of the starting solution, hydroxyapatite or brushite precipitates form. Infrared and Raman spectroscopy also show that significant amounts of nitrate ions are incorporated in the precipitates. Energy dispersive X-ray spectroscopy shows that the Ca/P ratio varies throughout the samples and resembles that of other bioinspired calcium phosphate hybrid materials. Elemental analysis shows that the carbon (i.e., polymer) contents reach 10% in some samples, clearly illustrating the formation of a true hybrid material. Overall, the data indicate that a higher polymer concentration in the reaction mixture favors the formation of polymer-enriched materials, while lower polymer concentrations or high precursor concentrations favor the formation of products that are closely related to the control samples precipitated in the absence of polymer. The results thus highlight the potential of (water-soluble) cellulose derivatives for the synthesis and design of bioinspired and bio-based hybrid materials.

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“…Spectral features reflect the interaction between the organic matrix and inorganic crystallites. All spectra exhibited similar characteristic bands at 1095, 1031, 961, 603 and 564 cm −1 that were assigned to different vibrational modes of the HA phosphate group, and bands at 3570 cm −1 and 633 cm −1 that corresponded to the stretching and bending vibrations of the HA hydroxyl group, respectively [16,17]. The characteristic bands of the CS organic matrix were also apparent at 1655 and 1550 cm −1 , corresponding to amide I (C O) and amide II ( NH), respectively [18,19].…”

Section: Compositional Analysismentioning

confidence: 93%