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Science Highlights


Science highlights feature research conducted by staff and users at the ALS.

If a Power Point summary slide or a PDF handout of the highlight is available, you will find it linked beneath the highlight listing and on the highlight's page. You may also print a version of a highlight by clicking the print icon associated with each highlight.



ALS Capabilities Reveal How Like Can Attract Like Print
Wednesday, 26 March 2014 00:00

Berkeley Lab researchers working at the ALS have observed an unusual pairing that seems to go against a universal scientific truth—that opposite charges attract and like charges repel. The researchers demonstrated that, when hydrated in water, positively charged ions (cations) can actually pair up with one another.

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Twist Solves Bilayer Graphene Mystery Print
Wednesday, 26 March 2014 00:00

Researchers have discovered a new twist to the story of bilayer graphene, solving a mystery that has held back device development. In stacking graphene monolayers, subtle misalignments create an almost imperceptible twist between the layers that can have surprisingly strong effects on electronic properties.

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High-Pressure MOF Research Yields Structural Insights Print
Wednesday, 26 February 2014 00:00

Metal-organic frameworks have shown promise in a variety of applications ranging from gas storage to ion exchange. Accurate structural knowledge is key to the understanding of the applicability of these materials; to learn more, researchers used ALS Beamline 11.3.1 to perform in situ, high-pressure, single-crystal x-ray diffraction.

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Ultrafast Transformations in Superionic Nanocrystals Print
Wednesday, 29 January 2014 00:00

Ultrafast x-ray studies reveal how superionic nanocrystals transform into the conducting phase, with the transformation time set by the speed limit for ions hopping through the lattice. Such materials could be used as solid-state electrolytes for novel batteries or in resistive switching devices.

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New Spectroscopic Technique Reveals the Dynamics of Operating Battery Electrodes Print
Wednesday, 29 January 2014 00:00

Researchers at the ALS have developed a new technique based on soft x-­ray spectroscopy that could help scientists better understand and improve the materials required for high-performance lithium-ion batteries.

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The Molecular Ingenuity of a Unique Fish Scale Print
Monday, 25 November 2013 12:06

ALS research has shown how the scales of a freshwater fish found in the Amazon Basin can literally re-orient themselves in real time to resist force, in essence creating an adaptable body armor.

 

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New Research on Jamming Behavior Expands Understanding Print
Tuesday, 22 October 2013 00:00

Recent ALS research has revealed that even magnetic domains behave very much like other granular material systems, and their dynamical behavior mimics the universal characteristics of several jammed systems.

 

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Learning from Roman Seawater Concrete Print
Wednesday, 25 September 2013 00:00

Analyses of ancient concrete samples pinpointed why the best Roman concrete was superior to most modern concrete in durability, why its manufacture was less environmentally damaging, and how these improvements could be adopted in the modern world.

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Pseudo-Single-Bunch Expands Experimental Scope Print
Wednesday, 25 September 2013 00:00

Initial tests of a new pseudo-single-bunch (PSB) operational mode at the ALS have shown promising results—PSB would vastly expand the facility’s capacity to carry out dynamics and time-of-flight experiments with a major reduction in sample damage.

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A Spintronic Semiconductor with Selectable Charge Carriers Print
Wednesday, 28 August 2013 00:00

Researchers found a semiconductor with two properties crucial for spintronics: a large Rashba effect (splitting of degenerate spin states) and ambipolarity (conduction via electrons and holes). Furthermore, it is possible to control whether the charge carriers are electrons or holes by engineering the surface layer.

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From Protein Structure to Function: Ring Cycle for Dilating and Constricting the Nuclear Pore Print
Wednesday, 28 August 2013 00:00

Nuclear pore complexes (NPCs) serve as gatekeepers between a cell's cytoplasm and its nucleus. Through crystallographic analyses at the ALS, researchers have elucidated the molecular architecture of the NPC transport channel.

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Reversing the Circulation of Magnetic Vortices Print
Wednesday, 31 July 2013 00:00

Recently, magnetic vortices have drawn scientists toward the possibility of multibit magnetic memory in which each logic unit has four states instead of two. Previous studies showed how to flip the vortex polarity. Now, researchers show how to reverse the circulation from clockwise to counterclockwise.

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Mapping Particle Charges in Battery Electrodes Print
Friday, 26 July 2013 14:18

Despite the technological innovations and widespread use of batteries, the mechanism behind charging and discharging particles remains largely a mystery. Recently, researchers combined synchrotron-based scanning transmission x-ray microscopy with transmission electron microscopy at ALS Beamlines 5.3.2 and 11.0.2 to probe the charging and discharging dynamics of lithium iron phosphate, a promising positive battery electrode.

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Iron Availability in the Southern Ocean Print
Friday, 21 June 2013 10:08

A study by scientists from South Africa’s Stellenbosch University, Princeton University, and the ALS looks at the reduced abundance of sea life and phytoplankton in the photic zone of the Southern Ocean, suggesting that a lack of iron in an easy-to-use form is affecting the ecosystems.

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Shedding Light on Nanocrystal Defects Print
Thursday, 20 June 2013 10:41

Nanocrystals have attracted much scientific interest lately, but recent ALS research has shown that their tiny size does not safeguard them from defects. Nanocrystals subjected to high pressure experiments suffered dislocation-mediated plastic deformation even when the crystals were only three nanometers in size.

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