Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Nanotubes that Heal: Engineering Better Orthopedic Implants

Fibroblasts growing on titanium alloy coated with nanotubes
Fibroblasts growing on titanium alloy coated with nanotubes

Abstract:
Titanium and its alloys have a leg up on all other materials used to make the orthopedic implants used by surgeons to repair damaged bones and joints. They are light, super-strong, and virtually inert inside the body. But whether the implants are destined for your knee, your hip, your spine or your jaw, the silvery metal has one big drawback.

By Marcia Goodrich

Nanotubes that Heal: Engineering Better Orthopedic Implants

Houghton, MI | Posted on May 19th, 2010

"Titanium has a mirror surface," says Tolou Shokufar, a PhD candidate in mechanical engineering-engineering mechanics. Cells don't adhere to it very well, so implants are often roughened up before they are placed in the body.

A good way to roughen titanium is to etch nanotubes into it, since they provide a superb surface for bone cells to grasp onto as part of the healing process. But etching nanotubes in the titanium alloy preferred by surgeons is not cheap. Conventional techniques require platinum, which costs over $1,700 an ounce.

Through her PhD work with Professor Craig Friedrich, director of the Multi-scale Technologies Institute, Shokufar has developed a less expensive way to etch nanotubes into the titanium alloy. In a weak solution of ammonium fluoride, she immerses two rods, one of the alloy, another of copper, and hooks them up to a power source. An electrical current flows into the copper, through the solution and out the titanium.

"It corrodes the titanium dioxide layer on the titanium in the form of a tube," Shokufar says, making nanotubes about seven microns long and a hundred nanometers in diameter. Growing the ideal tube takes about two hours.

Then she applies heat and pressure to the titanium alloy, annealing the nanotubes to give them a hydrophilic, crystalline structure. The surface not only attracts water, tests show it provides a friendly place for cells to grow. Shokufar has conducted experiments with fibroblasts—cells that make scar tissue—showing they grow faster on a layer of her titanium dioxide nanotubes than on the unaltered surface of the titanium alloy. Next, she aims to do a similar experiment with bone-growing osteoblasts.

Because the nanotubes are chemically identical to the titanium alloy, Shokufar expects that her innovation could be approved for medical use with relative ease. It may also have a wide variety of other applications, ranging from drug delivery to solar cells to hydrogen generation.

Her technique seems simple, but it didn't start out that way. "It took a lot of time to figure out," she says. "I'd spend days and days under the SEM, and when I went to sleep, I saw nanotubes inside my eyelids."

It's been worth it to see the perfect sheets of nanotubes grow under her care, however. "I really like them," she says. "They are like my babies."

####

About Michigan Technological University
Michigan Technological University (mtu.edu) is a leading public research university developing new technologies and preparing students to create the future for a prosperous and sustainable world. Michigan Tech offers more than 130 undergraduate and graduate degree programs in engineering; forest resources; computing; technology; business; economics; natural, physical and environmental sciences; arts; humanities; and social sciences.

For more information, please click here

Contacts:
Marcia Goodrich

906-487-2343

Copyright © Michigan Technological University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

New Biological Nano-Fertilizers Presented in Iran as Appropriate Replacements for Chemical Fertilizers April 18th, 2015

Iranian Foodstuff, Agricultural Industries Welcome Nanotechnology Packaging Bags April 18th, 2015

Nanocomposites Play Effective Role in Production of Smart Fibers April 18th, 2015

Dais Analytic Corporation Appoints Eliza Wang to Board of Directors: Company's Newest Director Brings Expertise in Commercial and Legal Matters Both in the United States and China; Joins on the Heels of Successful Business Development Trade Mission to China April 18th, 2015

Possible Futures

A glass fiber that brings light to a standstill: By coupling photons to atoms, light in a glass fiber can be slowed down to the speed of an express train; for a short while it can even be brought to a complete stop April 9th, 2015

Nanotechnology in Medical Devices Market is expected to reach $8.5 Billion by 2019 March 25th, 2015

Nanotechnology Enabled Drug Delivery to Influence Future Diagnosis and Treatments of Diseases March 21st, 2015

Nanocomposites Market Growth, Industry Outlook To 2020 by Grand View Research, Inc. March 21st, 2015

Nanotubes/Buckyballs

Nanotubes with two walls have singular qualities: Rice University lab calculates unique electronic qualities of double-walled carbon nanotubes April 16th, 2015

MIT sensor detects spoiled meat: Tiny device could be incorporated into 'smart packaging' to improve food safety April 15th, 2015

Taking aircraft manufacturing out of the oven: New technique uses carbon nanotube film to directly heat and cure composite materials April 14th, 2015

Iranian Scientists Evaluate Dynamic Interaction between 2 Carbon Nanotubes April 14th, 2015

Nanomedicine

Optical resonance-based biosensors designed for medical applications April 18th, 2015

Nanocomposites Play Effective Role in Production of Smart Fibers April 18th, 2015

Novel nanoparticles could save soldiers' lives after explosions April 15th, 2015

Nanoparticles at specific temperature stimulate antitumor response: Dartmouth researchers identify precise heat to boost immune system against cancer tumors April 14th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE