Connect with us

Metal

Mechanical properties and bioactivity of porous PLGA/TiO2 nanoparticle-filled composites for tissue engineering scaffolds

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

Poly(lactide-co-glycolide) (PLGA) foams and PLGA/titanium dioxide (TiO2) nanoparticle-filled composite foams (porosity > 90%) were produced by thermally induced solid–liquid phase separation (TIPS) and subsequent solvent sublimation. The scaffolds exhibit bimodal and anisotropic pore structures, with tubular macropores (approximately 100 μm in diameter) interconnected by a network of micropores. Quasi-static compression testing and dynamic mechanical analysis were carried out and the results were correlated to the microstructure observed by SEM, confirming the strong anisotropic behaviour of the foams. A study of the collapse mechanism of the foams porous structure revealed that when compressed in the main pore direction, the scaffolds failure mechanism involves an initial “accommodation” of large regions of the porous structure, followed by the collapse of individual pores in different modes. The bioactivity of the scaffolds was demonstrated by immersion in simulated body fluid (SBF) for up to 28 days. Formation of hydroxyapatite crystals on the scaffold surface was confirmed by X-ray diffraction analysis.

This article originally appeared in Composites Science and Technology 67, 2007, Pages 1139-1147.

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

Republished by Plato

Published

on

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

Poly(lactide-co-glycolide) (PLGA) foams and PLGA/titanium dioxide (TiO2) nanoparticle-filled composite foams (porosity > 90%) were produced by thermally induced solid–liquid phase separation (TIPS) and subsequent solvent sublimation. The scaffolds exhibit bimodal and anisotropic pore structures, with tubular macropores (approximately 100 μm in diameter) interconnected by a network of micropores. Quasi-static compression testing and dynamic mechanical analysis were carried out and the results were correlated to the microstructure observed by SEM, confirming the strong anisotropic behaviour of the foams. A study of the collapse mechanism of the foams porous structure revealed that when compressed in the main pore direction, the scaffolds failure mechanism involves an initial “accommodation” of large regions of the porous structure, followed by the collapse of individual pores in different modes. The bioactivity of the scaffolds was demonstrated by immersion in simulated body fluid (SBF) for up to 28 days. Formation of hydroxyapatite crystals on the scaffold surface was confirmed by X-ray diffraction analysis.

This article originally appeared in Composites Science and Technology 67, 2007, Pages 1139-1147.

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

Source: https://www.materialstoday.com/biomaterials/features/mechanical-properties-and-bioactivity-of-porous/

Metal

Authentic gold from the Scottish Highlands

People have mined, refined and valued gold since Mesopotamian times, with records of early gold jewelry from 2600 BCE — but what about gold from the Scottish Highlands? Anyone who has seen images of…

[[ This is a content summary only. Visit my website for full links, other content, and more! ]]

Republished by Plato

Published

on

Scottish Highlands

EyesTravelling/Adobe Stock

People have mined, refined and valued gold since Mesopotamian times, with records of early gold jewelry from 2600 BCE — but what about gold from the Scottish Highlands?

Anyone who has seen images of Egyptian Pharaoh Tutankhamun’s tomb created almost entirely of gold in 1223 BCE can only wonder at the volumes of gold that must have been refined over 3,000 years ago.

The MetalMiner 2021 Annual Outlook consolidates our 12-month view and provides buying organizations with a complete understanding of the fundamental factors driving prices and a detailed forecast that can be used when sourcing metals for 2021 — including expected average prices, support and resistance levels.

Gold from the Scottish Highlands

Yet, investors today are still fascinated with gold. However, gold’s actual uses are limited (outside of jewelry and high-end electronics).

Unfortunately, as a recent Daily Mail article quotes Scotgold CEO Richard Gray, who said “gold mines are where god put the gold,” not by extension where we would like them.

So, it has taken a strong gold price and political blessing for Scotland’s only domestic gold miner, the aptly named Scotgold, to gain permission to develop gold reserves in the Trossachs National Park. The park is in an area of outstanding natural beauty and is home to some of the best-preserved oak woodlands in Scotland.

Gold mining and Scotland are not activities and locations that one immediately makes an association between. In fact, more Scots rushed to California’s gold rush than ever mined at home.  However, gold prospectors have looked for gold in Scotland’s rivers for centuries.

The country is in the broad gold belt that stretches from Scandinavia across Greenland to Canada with, in places, similar topography and geology.

History of gold in Scotland

Miners discovered gold in the area in the 1980s, the article notes. However, production got off to a slow start after the price of gold crashed. Scotgold took over the project in 2007, it struggled to secure enough cash to get it up and running.

In 2018, the firm won planning permission for an underground mine. Work on the Cononish mine, named after the area to the west of Tyndrum, will start next month. Peak production is expected by 2022.

The miner aims to produce 23,500 troy ounces of gold on average per year. Furthermore, it believes it can recover more than 176,000 ounces in total. That amount is worth about £255 million ($332 million) at current prices.

In addition, the resource reportedly contains over a million ounces of silver. That adds roughly another 10% to the value at current market prices. Interestingly, around 25% of the gold will come out in a form suitable to sell directly on to jewelers.

That gold will be labeled authentic Scottish gold. It’s a novel value add in a world where mining provenance is of increasing value.

You want more MetalMiner on your terms. Sign up for email updates today.

Source: http://feedproxy.google.com/~r/agmetalminer/~3/uWlDWt12rg4/

Continue Reading

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.

Republished by Plato

Published

on

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

Continue Reading

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.

Republished by Plato

Published

on

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

Continue Reading
CBD21 hours ago

The New Italian Cannabis Contradiction

Heartland3 days ago

Medical Experts Discuss Uses of CBD (via JAMA — Top Medical Journal)

Heartland5 days ago

Dosage for CBG/CBD tincture from LN?

Heartland5 days ago

Cybin Raises C$45 Million: The Largest Go Public Capital Raise in the Canadian Psychedelic Sector

Heartland5 days ago

Indus Holdings, Inc. Welcomes Bruce Gates to Board of Directors; Announces Results of Annual Shareholder Meeting

Heartland3 days ago

Is There An Age Limit For CBD? [Is It 18 or 21?]

Heartland15 hours ago

Bought Haven St. 150 peace tea. Looking for a review before I brew myself a cup

CBD4 days ago

CBD News Roundup: NFLPA Warns Players Not to Endorse CBD

News5 days ago

Report Finds Legal Cannabis Could Bring Texas $500M In Annual Tax Revenue

Heartland4 days ago

Mind Cure Announces LOI for Acquisition of Epiphany360 Digital Therapeutics Platform for Treating Mental Health

Heartland3 days ago

CBD is a life-saver for me.

Heartland2 days ago

Terping out my own cbd/cbg isolate for dabbing!! YUM!

News20 hours ago

Sugarbud Announces Supply Agreement with British Columbia Liquor Distribution Branch

Heartland4 days ago

Goal of industrial hemp is to augment existing food security planning

Heartland3 days ago

CBD for Muscle Spasms and Other MS Symptoms

Heartland3 days ago

Industrial hemp seminar held in Chamberlain

Heartland3 days ago

Highly Recommend, so relaxing!!

Heartland3 days ago

The History of CBD

Heartland3 days ago

Tryplainjane 1000 mg CBD Full Spectrum Oil $29 Legit or Scam?

Heartland3 days ago

Hemp Drying Market Report 2020: Manufacturers, Countries, Type and Application, Global …

Heartland3 days ago

Hemp heist foiled by alarm in Falls

Heartland1 day ago

Who Is Newly Lobbying On Cannabis?

Heartland5 days ago

3 Psychedelic Business Models (and What’s Best for Investors)

Heartland5 days ago

What Does CBD Oil Taste Like?

Heartland5 days ago

TMJ pain…..what form of CBD is best?

Heartland5 days ago

Leading Colorado Edibles Brand Sees This Product as The Future of Cannabis Consumption

News5 days ago

Report Shows Almost Half of Cannabis Users are Over 40

Heartland4 days ago

Temp your taste buds: Hemp~Vana Nights sets table for 5-course dinner

Heartland4 days ago

High Times Greats: Timothy Leary

Heartland3 days ago

Advie on CBD use while breastfeeding

Trending

A Cloud Nine Capital Entity Copyright © 2020 – All Rights Reserved Proudly Made in America