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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

ExOne names distributor in South Korea

Additive manufacturing (AM) company ExOne has named foundry specialist ABC Corporation as its distributor in South Korea.

‘ABC’s foundry experience will help ExOne reach the local market to share the many benefits of incorporating sand binder jetting into their business models,’ said Ben Leung, ExOne vice president, Asia.

‘By partnering with ExOne, ABC Corporation is delighted to have the opportunity to introduce the state-of-the-art technology into traditional foundry processes,’ added JH Lee, ABC Corporation manager.

‘Automotive companies and their tier-one suppliers are committed to innovating castings for electric vehicles with the goal of developing lightweight, thin-walled designs that are durable enough to improve fuel efficiency,’ he added. ‘Because of the limited development period for new models fast and accurate iterations are essential, and this is where we think ExOne matches the industry needs.’

This story uses material from ExOne, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Republished by Plato

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Additive manufacturing (AM) company ExOne has named foundry specialist ABC Corporation as its distributor in South Korea.

‘ABC’s foundry experience will help ExOne reach the local market to share the many benefits of incorporating sand binder jetting into their business models,’ said Ben Leung, ExOne vice president, Asia.

‘By partnering with ExOne, ABC Corporation is delighted to have the opportunity to introduce the state-of-the-art technology into traditional foundry processes,’ added JH Lee, ABC Corporation manager.

‘Automotive companies and their tier-one suppliers are committed to innovating castings for electric vehicles with the goal of developing lightweight, thin-walled designs that are durable enough to improve fuel efficiency,’ he added. ‘Because of the limited development period for new models fast and accurate iterations are essential, and this is where we think ExOne matches the industry needs.’

This story uses material from ExOne, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Source: https://www.materialstoday.com/additive-manufacturing/news/exone-names-distributor-in-south-korea/

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Metal

ThermHex increases capital

Thermhex plans to focus on automating production of its honeycomb core.
Thermhex plans to focus on automating production of its honeycomb core.

ThermHex Waben GmbH, a subsidiary of EconCore, has reportedly increased its capital to €1 million.

‘With the very successful financial year and the capital increase, ThermHex is strengthening its position in the market,’ a press release said. ‘In the coming business year, the honeycomb core producer from Central Germany is planning some profound investments […] with the aim of further optimizing and expanding the automated and continuous production process of its honeycomb cores and driving forward the digitalization of its business processes.’

ThermHex also plans to be certified as a CO2-neutral company and meet the DIN EN ISO 14001 standard.

This story uses material from ThermHex, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Republished by Plato

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Thermhex plans to focus on automating production of its honeycomb core.
Thermhex plans to focus on automating production of its honeycomb core.

ThermHex Waben GmbH, a subsidiary of EconCore, has reportedly increased its capital to €1 million.

‘With the very successful financial year and the capital increase, ThermHex is strengthening its position in the market,’ a press release said. ‘In the coming business year, the honeycomb core producer from Central Germany is planning some profound investments […] with the aim of further optimizing and expanding the automated and continuous production process of its honeycomb cores and driving forward the digitalization of its business processes.’

ThermHex also plans to be certified as a CO2-neutral company and meet the DIN EN ISO 14001 standard.

This story uses material from ThermHex, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Source: https://www.materialstoday.com/composite-industry/news/thermhex-increases-capital/

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Metal

Owens Corning appoints healthcare specialist to board

Glass fiber specialist Owens Corning says that Paul E Martin, former senior vice president at Baxter International, has been elected to the company’s board of directors.

From 1999 to 2011, Martin held several senior management positions at Rexam plc, a consumer packaging manufacturing company based in the UK, and information technology leadership positions at CIT Group Inc, BNSF Railway Company and Frito-Lay Inc.

‘Along with his global business experience, Paul’s broad technology expertise will bring significant value and insights to our board and company,’ said Brian Chambers, chairman and CEO.

This story uses material from Owens Corning, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Republished by Plato

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Glass fiber specialist Owens Corning says that Paul E Martin, former senior vice president at Baxter International, has been elected to the company’s board of directors.

From 1999 to 2011, Martin held several senior management positions at Rexam plc, a consumer packaging manufacturing company based in the UK, and information technology leadership positions at CIT Group Inc, BNSF Railway Company and Frito-Lay Inc.

‘Along with his global business experience, Paul’s broad technology expertise will bring significant value and insights to our board and company,’ said Brian Chambers, chairman and CEO.

This story uses material from Owens Corning, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.

Source: https://www.materialstoday.com/composite-industry/news/owens-corning-appoints-healthcare/

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