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Metal

Biodegradable near-infrared-photoresponsive shape memory implants based on black phosphorus nanofillers

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In this paper, we propose a new shape memory polymer (SMP) composite with excellent near-infrared (NIR)-photoresponsive shape memory performance and biodegradability. The composite is fabricated by using piperazine-based polyurethane (PU) as thermo-responsive SMP incorporated with black-phosphorus (BP) sheets as NIR photothermal nanofillers. Under 808?nm light irradiation, the incorporated BP sheets with concentration of only 0.08?wt% enable rapid temperature increase over the glass temperature of PU and trigger the shape change of the composite with shape recovery rate of ∼100%. The in vitro and in vivo toxicity examinations demonstrate the good biocompatibility of the PU/BP composite, and it degrades naturally into non-toxic carbon dioxide and water from PU and non-toxic phosphate from BP. By implanting PU/BP columns into back subcutis and vagina of mice, they exhibit excellent shape memory activity to change their shape quickly under moderate 808?nm light irradiaiton. Such SMP composite enable the development of intelligent implantable devices, which can be easily controlled by the remote NIR light and degrade gradually after performing the designed functions in the body.

This article originally appeared in Biomaterials? 164, 2018, Pages 11-21.

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

In this paper, we propose a new shape memory polymer (SMP) composite with excellent near-infrared (NIR)-photoresponsive shape memory performance and biodegradability. The composite is fabricated by using piperazine-based polyurethane (PU) as thermo-responsive SMP incorporated with black-phosphorus (BP) sheets as NIR photothermal nanofillers. Under 808?nm light irradiation, the incorporated BP sheets with concentration of only 0.08?wt% enable rapid temperature increase over the glass temperature of PU and trigger the shape change of the composite with shape recovery rate of ∼100%. The in vitro and in vivo toxicity examinations demonstrate the good biocompatibility of the PU/BP composite, and it degrades naturally into non-toxic carbon dioxide and water from PU and non-toxic phosphate from BP. By implanting PU/BP columns into back subcutis and vagina of mice, they exhibit excellent shape memory activity to change their shape quickly under moderate 808?nm light irradiaiton. Such SMP composite enable the development of intelligent implantable devices, which can be easily controlled by the remote NIR light and degrade gradually after performing the designed functions in the body.

This article originally appeared in Biomaterials? 164, 2018, Pages 11-21.

Source: https://www.materialstoday.com/biomaterials/features/biodegradable-nearinfraredphotoresponsive-shape/

Metal

CAAM: Auto vehicles sales in China down 3.9 percent in Oct 1-20

In the October 1-20 period of the current year, sales of automotive vehicles of 11 major automakers in China amounted to 1.027 million units.

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In the October 1-20 period of the current year, output and sales of automotive vehicles of 11 major automakers in China amounted to 1.215 million units and 1.027 million units, up 6.9 percent and down 3.9 percent year on year, respectively, according to the China Association of Automobile Manufacturers (CAAM).

In particular, passenger vehicle output and sales totaled 1.039 million units and 925,000 units, up 2.8 percent and down 5.3 percent year on year. Meanwhile, commercial vehicle output and sales reached 176,000 units and 101,000 units, up 40 percent and 11.5 percent year on year.

Source: https://www.steelorbis.com/steel-news/latest-news/caam-auto-vehicles-sales-in-china-down-39-percent-in-oct-1_20-1169895.htm

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Metal

China emerges as India’s top steel export destination in H1 2020-21, after Vietnam

China emerged as India’s biggest steel export destination during the first half of the fiscal year 2020-21 (April-September) with 1.9 million mt.

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China emerged as India’s biggest steel export destination during the first half of the fiscal year 2020-21 (April-September) with 1.9 million mt shipped, up from 2,500 mt during the corresponding period of the previous fiscal year, according to data of the Joint Plant Committee (JPC) under India’s steel ministry, the sole official compiler of industry data.

During the period, China replaced Vietnam as India’s biggest steel export destination. Indian exports of steel to Vietnam during the first half of the current fiscal were estimated at 1.61 million mt, up from 1.04 million mt during the corresponding period of the previous fiscal year, JPC data showed.

In H1 FY 2020-21, India also emerged as a net exporter of steel, exporting 6.54 million mt, up 66.3 percent year on year. Of the total Indian steel exports, hot rolled coil (HRC) formed the bulk of the volume – up to 70 percent.

Imports during the period came to 1.99 million mt, down 50.6 percent year on year.

However, in September Indian steel exports showed signs of tapering off on the back of rising domestic demand from key industries like automotive and consumer durables.

The JPC data show that exports in September declined by 16.8 percent from August and 15.2 percent from September 2019. Total September exports were recorded by JPC at 864,000 mt.

Source: https://www.steelorbis.com/steel-news/latest-news/china-emerges-as-indias-top-steel-export-destination-in-h1-2020_21-after-vietnam-1169891.htm

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Metal

India’s Tata Metaliks resumes BF operations after maintenance shutdown

India’s Tata Metaliks Limited (TML) has resumed operations of its blast furnace from today.

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India’s Tata Metaliks Limited (TML) has resumed operations of its blast furnace from today, according to a regulatory filing of the company on Monday, October 26.

Last month, TML had shut down this blast furnace at its steel mill in West Bengal for planned repair and maintenance, including hearth profiling.

Tata Metaliks has a 300,000 metric ton per year pig iron production facility along with a 200,000 metric ton per year ductile pipe making facility and is also building a 15 MW captive thermal power plant.

Source: https://www.steelorbis.com/steel-news/latest-news/indias-tata-metaliks-resumes-bf-operations-after-maintenance-shutdown-1169882.htm

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