Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Let the good tubes roll

19.01.2018

Inspired by biology, a PNNL-led team of scientists has created new tiny tubes that could help with water purification and tissue engineering studies

Materials scientists, led by a team at the Department of Energy's Pacific Northwest National Laboratory, designed a tiny tube that rolls up and zips closed.


Scientists at PNNL have created a new family of nanotubes that are composed of peptide-like molecules called peptoids. These nanotubes start out as small droplets that come together to form a cell-membrane-like sheet. Then the sheet folds at one end and zips closed into a tube.

Credit: PNNL

These hollow nanotubes are thousands of times smaller than a strand of human hair and could help with water filtration, tissue engineering and many other applications.

The tubes were inspired by protein structures called microtubules that reside in cells, according to PNNL's Chun-Long Chen.

"The structure of the cell is so beautiful," said Chen, a materials chemist who conceived of and directed the project. "We wanted to create a synthetic system that mimics the microtubule structure and is stable enough for a variety of technical applications."

Chen, his PNNL colleagues and their collaborators published their findings this week in Nature Communications.

Mimicking microtubules

Microtubules are tiny hollow tubes that help keep DNA organized during cell division and form highways for shuttling contents around in the cell.

These cellular roads are composed of long chains of proteins that come together into a rigid, but hollow, tube. Microtubules have a uniform but dynamic structure, and they inspire scientists like Chen.

Chen's group hopes to use tiny hollow tubes like microtubules to create a robust water filtration system that would catch salt or other molecules inside and let pure water escape out the other end. In addition, they want to monitor how stem cells adapt to different environments by studying how the cells change while they grow on these tubes.

But the researchers can't use microtubules themselves for these projects. Microtubules may be rigid and responsive, but they're also susceptible to temperature changes and microbes.

For example, "if we want to use microtubules for water filtration, you don't want to have a filter that can be eaten by bacteria," said Chen.

So the team set about making a synthetic version of microtubules using protein-like molecules called peptoids. Like proteins, peptoids are composed of a repeating pattern of building blocks with slight variations, but peptoids are more stable.

These new nanotubes form in a unique way. First, small peptoid particles come together to form a sheet. Then the sheet closes at one end and rolls into a seamless tube.

Nano toolkit

To characterize the nanotubes, the scientists used a variety of techniques, including some at the Advanced Light Source and the Molecular Foundry, two DOE Office of Science User Facilities at Lawrence Berkeley National Laboratory.

Chen and his team discovered that these nanotubes are highly tailorable. The group could control a tube's size, diameter, thickness and stiffness by adjusting the tube composition or changing the acidity of the solution.

To test the rigidity of the nanotubes, Chen's team put pressure on individual nanotubes and measured how they changed shape. The tubes have a rigidity that falls between biological tissue and harder substances like glass and mica, which, said Chen, is great for the types of experiments he hopes to do.

But Chen doesn't want to stop there. For him, the goal is to create something that mimics nature in structure and function.

"Nature has offered us all kinds of beautiful examples," he said. "Fish can take in water from the sea without having to worry about high salt conditions. If we could mimic this behavior by building artificial cell membranes containing these nanotubes, we could solve some of the big problems facing our world today."

###

This work was supported by the Department of Energy Office of Science, PNNL and the National Science Foundation of China.

Reference: Haibao Jin, Yan-Huai Ding, Mingming Wang, Yang Song, Zhihao Liao, Christina L. Newcomb, Xuepeng Wu, Xian-Qiong Tang, Zheng Li, Yuehe Lin, Feng Yan, Tengyue Jian, Peng Mu, Chun-Long Chen. Designable and Dynamic Single-Walled Stiff Nanotubes Assembled from Sequence-Defined Peptoids, Nature Communications, Jan. 18, 2018, DOI: 10.1038/s41467-017-02059-1.

Interdisciplinary teams at Pacific Northwest National Laboratory address many of America's most pressing issues in energy, the environment and national security through advances in basic and applied science. Founded in 1965, PNNL employs 4,400 staff and has an annual budget of nearly $1 billion. It is managed and operated by Battelle for the U.S. Department of Energy's Office of Science. As the single largest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information on PNNL, visit the PNNL News Center, or follow PNNL on Facebook, Google+, Instagram, LinkedIn and Twitter.

Media Contact

Susan Bauer
susan.bauer@pnnl.gov
509-372-6083

 @PNNLab

http://www.pnnl.gov/news

Susan Bauer | EurekAlert!

More articles from Materials Sciences:

nachricht In borophene, boundaries are no barrier
17.07.2018 | Rice University

nachricht Research finds new molecular structures in boron-based nanoclusters
13.07.2018 | Brown University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Microscopic trampoline may help create networks of quantum computers

17.07.2018 | Information Technology

In borophene, boundaries are no barrier

17.07.2018 | Materials Sciences

The role of Sodium for the Enhancement of Solar Cells

17.07.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>