Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Hopkins Engineer, Chemist Examine Impact of Carbon Nanotubes in Aquatic Environments

Oxidized carbon nanotubes with sorbates. Credit: Ball Lab / JHU
Oxidized carbon nanotubes with sorbates. Credit: Ball Lab / JHU

Abstract:
Carbon nanotubes (CNTs)—which resemble tiny rolls of chicken wire—are used in electronics, optics and other products because of their unusual strength and electrical conductivity. CNT's are also being used for drug delivery. But an engineer and a chemist affiliated with the Johns Hopkins Institute for NanoBioTechnology have teamed up to study the ways that nanotubes could transport harmful toxins in aquatic environments.

Hopkins Engineer, Chemist Examine Impact of Carbon Nanotubes in Aquatic Environments

Baltimore, MD | Posted on October 28th, 2008

William Ball, professor of environmental engineering in the Whiting School of Engineering, and Howard Fairbrother, professor of chemistry in the Krieger School of Arts and Sciences, received two separate grants from the National Science Foundation and the Environmental Protection Agency to study the effects of surface oxides on the behavior of carbon nanotubes and their influence on the mobility of contaminants in aquatic environments.

"When people or animals drink—or otherwise process—water that has been contaminated by CNTs, they may receive the toxins as well as the CNTs," says Ball. "Retention and toxicity of the CNT-bound chemicals is still unclear, but the retained chemicals and/or the CNTs themselves may cause harm and can also propagate further up the food chain."

The team will study how the surface chemistry of CNTs-namely the oxygen-containing functional groups (surface oxides) on the nanotubes—influence the material's ability to grab onto, transport, and release organic and inorganic pollutants and metals in lakes, streams and oceans, making the carbon nanotubes behave like a "Trojan Horse."

Part of the study will rely on models based on what is already known about the interaction of oxidized CNT surfaces and toxins. In a study published in Environmental Science and Technology in March 2008, Ball and Fairbrother investigated how surface oxides influenced the adsorption of Naphthalene on multi-walled carbon nanotubes (See reference below). Naphthalene is a common ingredient in mothballs, and exposure to high concentrations of the chemical can damage or destroy red blood cells.

In the experimental phase, the team will oxidize fresh CNTs with nitric acid to mimic the modifications used to purify and functionalize this carbon-based material. Next, the CNTs will be added to columns of silica or sand, and solutions containing organic compounds or metal ions will be flowed through. The liquid that flows out the other end of the column will be collected and analyzed. Testing will occur under different pHs and concentrations of dissolved organic matter, to represent aquatic environments.

These results, Ball says, will be further analyzed in light of appropriate theoretical models, as well as to experimental data about the sorption properties of the carbon nanotubes for various chemicals and the surface-surface interactions among and between CNTs and other materials.

To learn more about the participating Labs visit the profiles in the INBT Faculty Finder.

* Ball Lab
* Fairbrother Lab

Reference
Influence of Surface Oxides on the Adsorption of Naphthalene onto Multiwalled Carbon Nanotubes. Cho, Hyun-Hee, Smith, Billy A., Wnuk, Joshua D., Fairbrother, D. Howard, and Ball, William P. Environ. Sci. Technol., 42, 8, 2899 - 2905, 2008, 10.1021/es702363e

Story by Mary Spiro

####

About Institute for NanoBioTechnology (INBT)
The Institute for NanoBioTechnology at Johns Hopkins University is revolutionizing health care by bringing together internationally renowned expertise in medicine, engineering, the sciences, and public health to create new knowledge and groundbreaking technologies.

INBT programs in research, education, outreach, and technology transfer are designed to foster the next wave of nanobiotechnology innovation.

For more information, please click here

Contacts:
* Institute for NanoBioTechnology
214 Maryland Hall
3400 North Charles Street
Baltimore, MD 21218

* Email:
* Phone: (410) 516-3423
* Fax: (410) 516-2355

Mary Spiro

Copyright © Institute for NanoBioTechnology

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

International research team discovers new mechanism behind malaria progression: Findings provide a new avenue for research in malaria treatment April 27th, 2015

More is less in novel electronic material: Adding electrons actually shrinks the system April 27th, 2015

Graphenea celebrates fifth anniversary April 27th, 2015

Sensor Designed in Iran Able to Remove Formaldehyde Gas from Environment April 27th, 2015

Nanotubes/Buckyballs/Fullerenes

SouthWest NanoTechnologies CEO Dave Arthur to Speak at NanoBCA DC Roundtable on May 19 in Washington DC April 20th, 2015

How to maximize the superconducting critical temperature in a molecular superconductor: International team led by Tohoku University opens new route for discovering high Tc superconductors April 19th, 2015

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

Announcements

Scientists join forces to reveal the mass and shape of single molecules April 27th, 2015

The 16th Trends in Nanotechnology International Conference (TNT 2015) unveils 25 Keynote Speakers: Call for abstracts open April 27th, 2015

Graphenea celebrates fifth anniversary April 27th, 2015

Sensor Designed in Iran Able to Remove Formaldehyde Gas from Environment April 27th, 2015

Environment

Nanoparticles Used to Improve Mechanical, Thermal Properties of Cellulose Fibers April 23rd, 2015

Young NTU Singapore spin-off clinches S$4.3 million joint venture with Chinese commercial giant March 23rd, 2015

New processing technology converts packing peanuts to battery components March 22nd, 2015

EU Funded PCATDES Project has completed its half-period with success March 19th, 2015

Safety-Nanoparticles/Risk management

MIPT researchers put safety of magic anti-cancer bullet to test April 6th, 2015

NNI Publishes Workshop Report Assessing the Status of EHS Risk Science: Report examines progress three years after the release of the 2011 NNI EHS Research Strategy March 23rd, 2015

Are current water treatment methods sufficient to remove harmful engineered nanoparticle? March 10th, 2015

More study needed to clarify impact of cellulose nanocrystals on health: Few studies explore toxicity of cellulose nanocrystals March 10th, 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