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'Nanominerals' Influence Earth Systems From Ocean To Atmosphere To Biosphere

Date:
March 23, 2008
Source:
National Science Foundation
Summary:
The ubiquity of tiny particles of minerals -- mineral nanoparticles -- in oceans and rivers, atmosphere and soils, and in living cells are providing scientists with new ways of understanding Earth's workings. Our planet's physical, chemical, and biological processes are influenced or driven by the properties of these minerals.
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The ubiquity of tiny particles of minerals--mineral nanoparticles--in oceans and rivers, atmosphere and soils, and in living cells are providing scientists with new ways of understanding Earth's workings. Our planet's physical, chemical, and biological processes are influenced or driven by the properties of these minerals.

So states a team of researchers from seven universities in a paper published recently in the journal Science: "Nanominerals, Mineral Nanoparticles, and Earth Systems."

The way in which these infinitesimally small minerals influence Earth's systems is more complex than previously thought, the scientists say.

"This is an excellent summary of the relevance of natural nanoparticles in the Earth system," said Enriqueta Barrera, program director in NSF's Division of Earth Sciences. "It shows that there is much to be learned about the role of nanominerals, and points to the need for future research."

Minerals have an enormous range of physical and chemical properties due to a wide range of composition and structure, including particle size. Each mineral has a set of specific physical and chemical properties. Nanominerals, however, have one critical difference: a range of physical and chemical properties, depending on their size and shape.

"This difference changes our view of the diversity and complexity of minerals, and how they influence Earth systems," said Michael Hochella of the Virginia Polytechnic Institute and State University in Blacksburg, Va.

The role of nanominerals is far-reaching, said Hochella. Nanominerals are widely distributed throughout the atmosphere, oceans, surface and underground waters, and soils, and in most living organisms, even within proteins.

Oceans may be the principal reservoir, since they cover 70 percent of the Earth's surface. There, nanominerals can come from processes associated with both living and non-living things, Hochella said. "Every mineral goes through a nanophase stage as it begins to grow. If they begin to grow at many sites, but don't continue to grow much after they form, you will end up with a lot of them and they may persist."

Nanoparticles play an important role in the lives of ocean-dwelling phytoplankton, for example, which remove carbon dioxide from the atmosphere. Phytoplankton growth is limited by iron availability. Iron in the ocean is composed of nanocolloids, nanominerals, and mineral nanoparticles, supplied by rivers, glaciers and deposition from the atmosphere. Nanoscale reactions resulting in the formation of phytoplankton biominerals, such as calcium carbonate, are important influences on oceanic and global carbon cycling.

In addition to growth and weathering, mineral nanoparticles can be generated from mechanical grinding. One of the most interesting and important places where this happens is along earthquake-generating faults in the Earth's crust.

There is a distinction between clusters of atoms and nanoparticles, Hochella said. "The difference seems to be that clusters start to approach the size of the smallest nanoparticles, but the atoms in many of these small clusters are not packed very tightly together. They are not dense. The nanoparticles represent a much denser packing of atoms, more like a real mineral, or at least approaching the atomic packing density of a larger mineral."

On land, nanometer-scale hematite catalyzes the oxidation of manganese, resulting in the rapid formation of minerals that absorb heavy metals in water and soils. The rate of oxidation is increased when nanoparticles are present.

Conversely, harmful heavy metals may disperse widely, courtesy of nanominerals. In research at the Clark Fork River Superfund Complex in Montana, Hochella discovered a nanomineral involved in the movement of lead, arsenic, copper, and zinc through hundred of miles of Clark River drainage basin.

Nanominerals can also move radioactive substances. Research at one of the most contaminated nuclear sites in the world, a nuclear waste reprocessing plant in Mayak, Russian, has shown that plutonium travels in local groundwater, carried by mineral nanoparticles.

In the atmosphere, mineral nanoparticles impact heating and cooling. Such particles act as water droplet growth centers, which lead to cloud formation. The size and density of droplets influences solar radiation and cloud longevity, which in turn influence average global temperatures.

"The biogeochemical and ecological impact of natural and synthetic nanomaterials is one of the fastest growing areas of research, with not only vital scientific, but also large environmental, economic, and political consequences," the authors conclude.

In addition to Hochella, authors of the paper are Steven Lower of Ohio State University, and Patricia Maurice of the University of Notre Dame; along with R. Lee Penn of the University of Minnesota; Nita Sahai of the University of Wisconsin-Madison; Donald Sparks of the University of Delaware; and Benjamin Twining of the University of South Carolina.

This work was funded by the National Science Foundation.


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Cite This Page:

National Science Foundation. "'Nanominerals' Influence Earth Systems From Ocean To Atmosphere To Biosphere." ScienceDaily. ScienceDaily, 23 March 2008. <www.sciencedaily.com/releases/2008/03/080320150039.htm>.
National Science Foundation. (2008, March 23). 'Nanominerals' Influence Earth Systems From Ocean To Atmosphere To Biosphere. ScienceDaily. Retrieved May 21, 2024 from www.sciencedaily.com/releases/2008/03/080320150039.htm
National Science Foundation. "'Nanominerals' Influence Earth Systems From Ocean To Atmosphere To Biosphere." ScienceDaily. www.sciencedaily.com/releases/2008/03/080320150039.htm (accessed May 21, 2024).

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