New method for creating mesoporous materials from industrial polymers

Dec 02, 2013
A schematic view of a mesoporous polymer. Polymer assemblies in nanofiber form with pores of 10 to 20 nm in diameter are branched in a sophisticated fashion to create a minute three-dimensional network structure. The yellow lines represent assemblies of polymer chains that form nanofibers.

A team of researchers in the Separation Functional Materials Group of the Polymer Materials Unit, Advanced Key Technologies Division, National Institute for Materials Science, succeeded in developing a high-performance oil absorbent by creating a mesoporous material with pores of approximately 10 nm in diameter, using engineering plastics that are widely used as industrial materials.

At the site of oil or natural gas development, a large quantity of oil-contaminated water is generated. In order to prevent such water from polluting the environment, a low-cost and efficient water treatment system has been desired. In this respect, the technology for creating a mesoporous material from a general-purpose was expected to provide a method for producing a high-performance oil absorbent. However, the conventional technology was unable to form a nano-scale morphology of a porous polymer in a controlled manner, and this posed an obstacle to the production of a high-performance absorbent using a polymer.

In the process of producing an industrial porous polymer, phase separation of a polymer solution had been widely used. Taking note of this phenomenon, that is, cryogenic separation of a into a polymer and a solvent, the NIMS researchers succeeded in causing the solvent to form nanocrystals within engineering plastics. Then, by removing these nanocrystals by a unique method, they arrived at creating a mesoporous polymer in which nano-scale pores are connected in sequence. This mesoporous polymer can take the form of a sheet, pellet, or fiber. Under special conditions, the researchers were further able to create a polymer with pores of 1.9 nm in radius.

The newly developed mesoporous polymer, with its large surface area exceeding 300m2 per gram, can efficiently absorb oil that is contained in water. In the test regarding the degree of absorption of cresol contained in oil-contaminated , the researchers observed that this new absorbent can absorb more than 260mg of cresol per gram. Moreover, the new absorbent desorbs at a high temperature, which will make it possible to use the absorbent repeatedly. It is also excellent in absorbing gases, such as carbon dioxide, and therefore is expected to be applied as a gas separating agent.

Explore further: Drawing and writing in liquid with light (w/ Video)

More information: S. Samitsu*, R. Zhang, X. Peng, M. R. Krishnan, Y. Fujii, I. Ichinose,* "Flash Freezing Route to Mesoporous Polymer Nanofibre Networks," Nature Communications 4:2653 |DOI: 10.1038/ncomms3653

add to favorites email to friend print save as pdf

Related Stories

Drawing and writing in liquid with light (w/ Video)

Nov 04, 2013

University of Helsinki researchers have manufactured photochemically active polymers which can be dissolved in water or certain alcohols. The new soluble, photosensitive polymer was created by doctoral student ...

Versatile polymer film synthesis method invented

Aug 02, 2013

(Phys.org) —Forming perfect porous polymer films is not enough; they need both large and small pores, and the process of making them needs to be simple, versatile and repeatable. Creatively combining already ...

Turning vapors into foam-like polymer coatings

Oct 11, 2013

the essential component of plastics—are found in countless commercial, medical, and industrial products. Polymers that are porous are called foam polymers and are especially useful because they combine ...

Recommended for you

Tiny graphene drum could form future quantum memory

Aug 28, 2014

Scientists from TU Delft's Kavli Institute of Nanoscience have demonstrated that they can detect extremely small changes in position and forces on very small drums of graphene. Graphene drums have great potential ...

Graphene reinvents the future

Aug 27, 2014

For many scientists, the discovery of one-atom-thick sheets of graphene is hugely significant, something with the potential to affect just about every aspect of human activity and endeavour.

User comments : 0