Norman C. Bartelt This is Me

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1. 1. www.sciencenews.org

   www.sciencenews.org/view/gener - [Cached]

   Published on: 8/10/2004   Last Visited: 7/19/2008

   Schmid, Norman C. Bartelt, and Robert Q. Hwang spotted the action thanks to a specialized microscope.
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   "It's like looking at a mountain range, turning your back for a second, then looking back and the mountain range isn't there," says Bartelt.The STM was too slow to reveal that the tin had simply skittered away.The new microscope cleared up the mystery, he says.
   
   What's propelling these islands?Sandia's team proposes a repulsive force between tin atoms in the islands and tin atoms in the immobile bronze spots dotting the surface.The force would push the tin islands away from those spots.
   
   That leads to some surprisingly lifelike behavior, Bartelt says.Each island acts like a "creature [that] . . . searches out clean copper to eat," he says.Roving tin patches hesitate when their best path is not obvious.Also, he adds, when blocked by lines of repulsive bronze dots, "they do very funny things," such as shattering or squeezing through as a narrow thread.
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   Norman C. Bartelt
   
   Sandia National Laboratories
   
   P.O. Box 969
   
   7011 East Avenue
   
   Livermore, CA 94551-0969

2. 2. Small Times: News about MEMS, Nanotechnology and Microsystems

   www.smalltimes.com/document_di - [Cached]

   Published on: 4/24/2003   Last Visited: 5/26/2003

   In that field, "there's Ruud Tromp and then there's everybody else," said Norm Bartelt, a staff scientist at Sandia National Laboratories.Bartelt, a materials physicist, said Tromp's molecular movies have allowed theorists to "see equations come to life."
   
   "I never imagined we could see and know things about the dynamics of surface science in such detail," he said.

3. 3. Nanotemplates for Nanostructures; First Controllable 2D Nanopatterns Imaged by Sandia Researchers

   www.drrnews.com/releases/pa/se - [Cached]

   Published on: 8/31/2001   Last Visited: 10/16/2001

   Thus , such theories generally had been treated with a great deal of skepticism , says Sandia physicist Norm Bartelt : There was no obvious route for atoms to arrange themselves in predicted patterns..
   
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   There are many control knobs we can turn to create new patterns , says Bartelt.Among them are temperature and material composition.The researchers observed atoms of lead deposited on a copper substrate forming , first , lead dots , then lead stripes , and then reverse dots - copper becoming the dot material - as more lead is added.
   
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   There are precedents for people using these patterns for further growth of quantum dots , says Bartelt.They can be the starting point of controllable patterns that extend into three dimensions..
   
   Though models have clearly predicted the possibility of controlling any pattern's geometry and order , depending on temperature and amount of secondary metal introduced , experimental verification of these models had remained elusive till now.
   
   Sandia is a multiprogram laboratory operated by Sandia Corporation , a Lockheed Martin company , for the U.S. Department of Energy.With main facilities in Albuquerque , N.M. , and Livermore , Calif. , Sandia has major R&D responsibilities in national security , energy and environmental technologies , and economic competitiveness.
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   Story and images can be found at http : //www.sandia.gov/media/NR2001/dotbar.htm Sandia Media Relations Contact : Neal Singer , 505-845-7078 , nsinger@sandia.gov nsinger@sandia.gov Sandia Technical Contact : Norm Bartelt , 925-294-3061 , bartelt@sandia.gov.