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Nanocomposites of bacterial cellulose/hydroxyapatite for biomedical applications

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In the present work, a nanocomposite material formed by bacterial cellulose (BC) networks and calcium-deficient hydroxyapatite (HAp) powders was synthesized and characterized. The HAp nanoparticles were previously prepared by a wet chemical precipitation method, starting from aqueous solutions of calcium nitrate and di-ammonium phosphate salts. Energy-dispersive spectroscopy reveals that the prepared HAp corresponds to calcium-deficient hydroxyapatite. BC-HAp nanocomposites were prepared by introducing carboxymethylcellulose (CMC) into the bacteria culture media. HAp nanoparticles were then introduced and remained suspended in the culture medium during the formation of cellulose nanofibrils. The maximum gel thickness was obtained after 21 days of bacteria cultivation. X-ray diffractograms showed the difference of crystallinity among the materials involved in the formation of nanocomposites. The inorganic and organic bonds that corresponded to hydroxyapatite and bacterial cellulose respectively, were depicted by attenuated total reflectance Fourier transform infrared spectra. Scanning electron microscopy and atomic force microscopy measurements confirmed the formation of networks and fibres with smaller diameter corresponding to BC synthesized in the presence of CMC. Image analysis was also used to assess the orientation distributions and Feret diameters for networks of BC and BC-CMC. Thermogravimetric analysis showed that the amount of the mineral phase is 23.7% of the total weight of the nanocomposite. Moreover, HEK cells were cultivated and the biocompatibility of the materials and the cell viability was demonstrated.

This article originally appeared in Acta Biomaterialia 5, 2009, Pages 1605-1615.

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Sign up or log in to your free Materials Today account to download the full article.

In the present work, a nanocomposite material formed by bacterial cellulose (BC) networks and calcium-deficient hydroxyapatite (HAp) powders was synthesized and characterized. The HAp nanoparticles were previously prepared by a wet chemical precipitation method, starting from aqueous solutions of calcium nitrate and di-ammonium phosphate salts. Energy-dispersive spectroscopy reveals that the prepared HAp corresponds to calcium-deficient hydroxyapatite. BC-HAp nanocomposites were prepared by introducing carboxymethylcellulose (CMC) into the bacteria culture media. HAp nanoparticles were then introduced and remained suspended in the culture medium during the formation of cellulose nanofibrils. The maximum gel thickness was obtained after 21 days of bacteria cultivation. X-ray diffractograms showed the difference of crystallinity among the materials involved in the formation of nanocomposites. The inorganic and organic bonds that corresponded to hydroxyapatite and bacterial cellulose respectively, were depicted by attenuated total reflectance Fourier transform infrared spectra. Scanning electron microscopy and atomic force microscopy measurements confirmed the formation of networks and fibres with smaller diameter corresponding to BC synthesized in the presence of CMC. Image analysis was also used to assess the orientation distributions and Feret diameters for networks of BC and BC-CMC. Thermogravimetric analysis showed that the amount of the mineral phase is 23.7% of the total weight of the nanocomposite. Moreover, HEK cells were cultivated and the biocompatibility of the materials and the cell viability was demonstrated.

This article originally appeared in Acta Biomaterialia 5, 2009, Pages 1605-1615.

Sign up or log in to your free Materials Today account to download the full article.

Source: https://www.materialstoday.com/nanomaterials/features/nanocomp-bacterial-cellulosehydroxyapatite-bio-app/

Metal

Brazilian HDG exports and domestic offers increase

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SteelOrbis Elektronik Pazaryeri A.Ş. (“SteelOrbis”)
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Şeref Yazgan İş Merkezi, No: 72, Kat: 7, D: 18
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Istanbul, Turkey

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Source: https://www.steelorbis.com/steel-prices/steel-prices-market-analyses/flats-and-slab/brazilian-hdg-exports-and-domestic-offers-increase-1174234.htm

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Metal

US tin plate exports up 19.4 percent in September

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According to export data from the US Department of Commerce, US exports of tin plate totaled 9,097 mt in September 2020, up 19.4 percent from August and up 45.3 percent from September 2019 levels. By value, tin plate exports totaled $5.9 million in September, compared to $5.2 million in the previous month and $4.7 million the same month last year.

The US shipped the most tin plate to Pakistan in September with 2,207 mt, compared to 1,201 mt in August and 516 mt in September 2019. Other top destinations included Mexico, with 1,265 mt; and Sri Lanka, with 1,000 mt.

Source: https://www.steelorbis.com/steel-news/latest-news/us-tin-plate-exports-up-194-percent-in-september-1174231.htm

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Metal

US tin plate exports up 19.4 percent in September

Republished by Plato

Published

on

According to export data from the US Department of Commerce, US exports of tin plate totaled 9,097 mt in September 2020, up 19.4 percent from August and up 45.3 percent from September 2019 levels. By value, tin plate exports totaled $5.9 million in September, compared to $5.2 million in the previous month and $4.7 million the same month last year.

The US shipped the most tin plate to Pakistan in September with 2,207 mt, compared to 1,201 mt in August and 516 mt in September 2019. Other top destinations included Mexico, with 1,265 mt; and Sri Lanka, with 1,000 mt.

Source: https://www.steelorbis.com/steel-news/latest-news/us-tin-plate-exports-up-194-percent-in-september-1174231.htm

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