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Abstract:
IBN Scientists Discover New Method for the Facile Synthesis of a Wide Range of Nanoparticles with Multiple Functionalities

New Method Discovered for Nanoparticle Synthesis

Singapore | Posted on July 14th, 2009

Nanostructured materials have garnered great interest worldwide due to their unique size-dependent properties for chemical, electronic, structural, medical and consumer applications. IBN, the world's first bioengineering and nanotechnology research institute, has discovered a new environmentally friendly method to synthesize a wide variety of nanoparticles inexpensively. This new chemical synthesis has been recently published in the leading materials journal, *Nature Materials*, which has an impact factor of 23.132. 1

IBN researchers have developed a protocol to transfer metal ions from an aqueous solution to an organic solution such as toluene. Metal compounds that can dissolve in water are inexpensive and commonly available. Many useful metals and scarce materials that are soluble in water may now become readily employed in the synthesis of nanoparticles. This new approach developed by IBN is a simple, room-temperature process that does not produce toxic chemicals.

The research team at IBN has successfully transferred metal ions rapidly from water to an organic medium by mixing a solution of metal salts dissolved in water with an ethanol solution of dodecylamine (DDA). The metals would bond with the DDA and can then be extracted with an organic solvent. The transfer of the metal ions from the aqueous phase to the organic phase was successfully applied towards the synthesis of a variety of metallic, alloy and semiconductor nanoparticles. In contrast to other approaches for nanoparticles synthesis, the IBN protocol allows metal-based nanoparticles to be prepared in an organic medium using water-soluble, inexpensive, common metal precursors. This method is highly efficient and easily applied to derive many types of nanoparticles that have interesting applications, including metal-semiconductor nanocomposites and hybrid nanoparticles.

Besides IBN's focus on applying this protocol to the nanocrystalline synthesis of metals, semiconductors and their hybrids, the extraction of metals dissolved in water would be significant for applications in environmental remediation, e.g. extraction of heavy metals from water and soil. "Water pollution from heavy metals is a major long-term economic and healthcare problem that has global implications. Once contaminated, it is often difficult and expensive to purify the affected environment and extract the pollutants. Besides highly toxic metals such as mercury and lead, other valuable metals, including gold, silver, iridium and osmium, are also soluble in water, and may be extracted by our protocol," remarked Dr Jun Yang, IBN Research Scientist.

Organic Solvent - Organic solvents are chemical compounds that usually have a low boiling point, evaporate easily or can be removed by distillation. Solvents can be used to extract soluble chemical complexes from a mixture.

"At this point, it is possible to extract the metals very effectively using an organic solvent such as toluene to remove the metal residue. Organic solvents are less dense than ethanol or water and float on top of the aqueous solution. When we agitate the mixture, the metals dissolve in the toluene and are completely removed from the ethanol and water. Our process allows us to extract metals from water without leaching out the mineral ions that are normally present in water or soil," said Dr Jun Yang, IBN Research Scientist.

"We have demonstrated a general protocol for transferring metal ions from water to an organic phase. This technique may be applied to transfer a wide range of transition metal ions from water. We can greatly facilitate and reduce the cost of producing a variety of metallic, alloy, semiconductor and semiconductor-metal hybrid nanoparticles through our simple and flexible approach to engineer advanced materials with novel structures and multiple functionalities" said Professor Jackie Y. Ying, IBN Executive Director and principal investigator of this research.

1 Jun Yang and Jackie Y. Ying, "A General Phase-Transfer Protocol for Metal Ions and its Application in Nanocrystal Synthesis," Nature Materials, 2009, DOI 10.1038/NMAT2490.

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About Institute of Bioengineering and Nanotechnology
The Institute of Bioengineering and Nanotechnology (IBN) was established in
2003 and is spearheaded by its Executive Director, Professor Jackie Yi Ru
Ying, who has been on the Massachusetts Institute of Technology’s Chemical
Engineering faculty since 1992, and was among the youngest to be promoted to
Professor in 2001. In 2008, Professor Ying was recognized as one of “One
Hundred Engineers of the Modern Era” by the American Institute of Chemical
Engineers for her groundbreaking work on nanostructured systems, nanoporous
materials and host matrices for quantum dots and wires. Under her direction,
IBN conducts research at the cutting-edge of bioengineering and
nanotechnology. Its programs are geared towards linking multiple disciplines
across all fields in engineering, science and medicine to produce research
breakthroughs that will improve healthcare and our quality of life.

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