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Crystal-crystal phase transitions with liquid intermediate statesCrystal-crystal phase transitions with liquid intermediate states

Single-particle-resolution video microscopy of colloidal films reveal that transitions two different colloidal crystals (square- and triangular-lattices) occur via a two-step nucleation pathway with liquid nuclei in the intermediate stage. The nucleation pathway is favored over the direct one-step nucleation because the energy of the solid/liquid interface is lower than that between solid phases.The findings suggest that an intermediate liquid could exist in the nucleation processes of solid–solid transitions of many metals and alloys, and provide guidance for better control of the kinetics of the transition and for future refinements of solid–solid transition theory.

Nature Materials Article

 

 

  • Kathleen Stebe, Shu Yang, and Randall Kamien: Liquid-crystal-based Compound Lenses That Work Like Insect Eyes [ news release ]
  • Virgil Percec Develops Custom Artificial Membranes to Study the Molecular Basis of Disease [ news release ]
  • Cherie Kagan & Paulo Arratia - Penn Engineering 2015 Teaching Awards [ news release ]
  • New soft matter topical group of the American Physical Society led by Randall Kamien [ read more ]
  • Gazette article on Charles Kane's discovery of topological insulators [ read article ]
  • Talid Sinno, John Crocker, Kathleen Stebe use 'Soft' Nanoparticles to Model Behavior at Interfaces [ news release ]
  • Arjun Yodh and Tom Lubensky Discovers New Liquid Crystal Configurations [ news release ]
  • Robert Carpick helps explain Anti-wear Motor Oil Additive properties. [ news release ]
  • Nader Engheta & Zahra Fakhraai Develop a Way of Making Light-bending 'Raspberry-like Metamolecules' [ news release ]
  • Shu Yang, with help from Daniel Gianola, develop 'smart' windows. [ news release ]
  • David Srolovitz Elected to National Academy Of Engineering [ news release ]
  • Zahra Fakhraai Awarded Sloan Fellowship [ news release ]
  • Penn Student Chronicles the Emergence of Interdisciplinary Science Through Architecture [ news release ]
  • A.T. Charlie Johnson & Ritesh Agarwal Develop New Technique for Making Graphene Competitor, Molybdenum Disulfide [ news release ]
  • Philip Nelson discusses the ins and outs of authoring a science textbook [ news release ]
  • Shu Yang Named National Academy of Inventors Fellow [ news release ]
  • Randall Kamien and Shu Yang, Outline Basic Rules for Construction With a Type of Origami [ news release ]
  • Charles Kane and Eugene Mele, Win Benjamin Franklin Medal [ news release ]
  • Douglas Durian (U Penn) in collaboration with Remi Dreyfus (CNRS/Solvay), as part of the joint Compass laboratory, have studied the morphology of fingered flow in laboratory models of sandy soils with hydrogel particle additives. [ view paper ]
  • Alison Sweeney Receives 2014 Packard Fellowship in Science and Engineering [ read more ]
  • Arjun Yodh's group research helps uncover mechanism behind Solid-Solid Phase Transitions [ news release ]
  • Marija Drndic, Jennifer Lukes and Christopher Murray Study Nanocrystals by Passing Them Through Tiny Pores. [ news release ]
  • Virgil Percec, Paul Heiney: 'Onion' Vesicles for Drug Delivery [ news release ] [ C&EN article ]
  • Arjun Yodh Reappointed Director of LRSM [ read more ]
  • RET Alumn, Trey Smith receives Teacher as Hero Award [ read more ]
  • Charles Kane Elected to National Academy of Sciences [ news release ]
  • Philadelphia Science Festival 2014 [ read more ]
  • Science at the Sixers with Matthew Lohr and Daniel Beller [ highlight ]
  • Paulo Arratia - ‘Design for Failure’ With Model Material [ news release ]
  • Tom Lubensky and Charles Kane are "Stretching Boundaries" [ read more ]
  • Yodh, Lubensky and Collings are Turning Water Droplets Into ‘Gemstones’ [ news release ] [ PNAS link ]
  • Randy Kamien: Planting a Liquid-Crystal Garden [ read more ] [ press release ]
  • Shu Yang: superhydrophobic coatings [ watch video ]
  • Stebe, Kamien & Yang Add Another Tool in Their Directed Assembly Toolkit read more
  • Karen Winey: Computer Model That Will Help Design Flexible Touchscreenss read more
  • Dennis Discher and Stem Cell Differentiation read more
  • Kagan group ground breaking research published in ACS Nano demonstrates in-situ repair of nanocrystal surfaces allows large-area nanocrystal device fabrication in air and solvents. read article in ACS Nano
  • Research by Arjun Yodh of Physics and Astronomy indicates that stuttering may be caused by blood flow and hemodynamic changes in parts of the brain that control speech. read more
  • Dawn Bonnell, NBIC Director, appointed to Vice Provost for Research
  • MRSEC Team members win a $2 million, four-year NSF grant
  • Randy Kamien named Simons Investigator
  • Drndic: Advance in Nanotech Gene Sequencing Technique
  • LRSM-COMPLOIDS Workshop on Soft Matter April 17-19
  • Jennifer A. Lewis, "Printing Functional Materials" 3:00PM, LRSM Auditorium [ poster ]
  • Dennis Discher: "Protein 'Passport' That Help Nanoparticles Get Past Immune System" [ highlight ]
  • Dawn Bonnell Elected to National Academy of Engineering [ press release ]
  • Crocker & Sinno Use DNA to Make Crystals That Can Switch Configurations [ press release ]
  • Yodh, Durian groups Show Math Behind Growth of 'Coffee Rings' [ press release ]
  • Randall Kamien and Tom Lubensky, Help Create 'Recipe Book' for Building New Materials. [ press release ]
  • Penn team making waves with liquid crystals [ read more ] [ press release ]
  • SAS Interview with Charles Kane on Topological Insulators [ read article ]
  • LRSM Science Café @ World Cafe Live [ read more ]
  • Russell J. Composto receives NSF Special Creativity Award [ read more ]
  • Facilities for Nanotechnology in Philadelphia workshop 1.8.13 [ more info ]
  • Daeyeon Lee on crack-free nanoparticle films [ read more ]
  • Charles Kane Named Simons Investigator and Awarded $500,000 Grant [ read more ]
  • Watch video recorded during LRSM's 50th Celebration! [ watch the videos ]
  • Charles Kane Named Simons Investigator and Awarded $500,000 Grant [ read more ]
  • Kathleen Stebe Shows New Way of Assembling Particles Into Complex Structures [ read more ]
  • Daniel Hammer: Natural Plant Protein Into Drug-delivery Vehicles [ read more ]
  • Charlie Johnson Expands the Use of Carbon Nanotubes [ read more ]
  • Celebrating LRSM's 50th! [ read more ]
  • PREM Event: The New Science of Disordered Materials [ view poster ]
  • 2nd COMPASS Symposium March 28, 2012 [ view poster ]
  • Dennis Discher Elected to National Academy of Engineering [ read more ]
  • Philly Materials Science and Engineering Day, February 4, 2012 [ read more ]
  • Lukes and Winkelstein named 2012 Penn Fellows
  • Charlie Kane, 2012 Oliver E. Buckley Prize [ more ]
  • LRSM-NIMS Materials Workshop [ read more ]
  • Inside cover Advanced Materials, December 8, 2011 [ read article ]
  • LRSM awarded a six-year MRSEC grant from the NSF [ read more ]
  • Sensing membrane stress with near IR-emissive porphyrins

 

 

LRSM Science Café @ World Cafe LiveNew soft matter topical group of the American Physical Society

GSOFT is a new topical group within the American Physical Society is devoted to the science of soft condensed matter. LRSM research in our soft matter IRGs and Seeds are intellectually coupled to this new APS group, led by LRSM faculty member Randall Kamien.

[ news release ]
[ APS Topical Group on Soft Matter ]

LRSM Science Café @ World Cafe LiveLRSM Science Café @ World Cafe Live

The LRSM Science Café has formed a new partnership with World Cafe Live (3025 Walnut St., Philadelphia, PA), just off the Penn campus and only two blocks from the LRSM building. Beginning in January, 2013, our Science Cafés will be held in the upstairs room at WCL, starting at 6:30 pm. This is a larger venue than usual and we encourage attendees to come early for dinner before the presentation which will last, typically, 30-45 minutes and be followed by an open discussion session between speaker and the audience. The WCL is readily accessible by train, 30th St. Station, bus, 9, 21 and 42, and car, by on-street Pay and Display parking.

[ more on the Science Café program ]

Russell J. CompostoRussell J. Composto receives NSF Special Creativity Award

The award recognizes his pioneering research on the dispersion and assembly of gold nanorods confined to polymer nanolayers and their potential applications for optical property control.
[ read more ]

Dennis DischerDennis Discher Elected to National Academy of Engineering

Dennis E. Discher, Robert D. Bent Professor of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia. For elucidation of the effects of mechanical forces on cell physiology and stem cell development.
[ read more ]

 

Philly Materials Science and Engineering Day, February 4, 2012
[ read more ]

Charlie Kane, 2012 Oliver E. Buckley Prize

Charles KaneProf. Charlie Kane will be awarded the 2012 Oliver E. Buckley Prize in Condensed Matter Physics by the American Physical Society. Professor Kane and two other researchers are being recognized "For the prediction and subsequent discovery of the new phase of matter known as topological insulators in two dimensions, also known as quantum spin Hall insulators, which lead to its generalization and prediction in three dimensional system." The Buckley Prize will be presented at the APS March 2012 meeting in Boston, MA Feb. 27-March 2, 2012 at a special Ceremonial session.
[ press release ]

Lukes and Winkelstein named 2012 Penn Fellows

NIMS WorkshopLRSM-NIMS Materials Workshop
[ read more ]

Andrew Rappe: "Stressing the Most Important (Dirac) Points"

figure
"Editor's Suggestion" Physical Review B, v84
[ read more ]

Inside cover Advanced Materials, December 8, 2011

Pillar-Assisted Epitaxial Assembly of Toric Focal Conic Domains of Smectic-A Liquid Crystals

[ read article ]

LRSM awarded a six-year MRSEC grant from the NSF
[ read more ]

figureDaniel A. Hammer
Sensing membrane stress with near IR-emissive porphyrins

[ read more ]


Left: Sukekatsu Ushioda, NIMS presidentRight: Prof. Yodh, LRSM-UPenn directorSigning Ceremony of the Comprehensive Collaborative Agreement between LRSM and the National Institute for Materials Science (NIMS)



Pillar-Assisted Epitaxial Assembly of Toric Focal Conic Domains of Smectic-A Liquid CrystalsAdvanced Materials inside cover article, Kamien, Stebe & Yang
Pillar-Assisted Epitaxial Assembly of Toric Focal Conic Domains of Smectic-A Liquid Crystals, December 8, 2011


Philly Materials Science and Engineering DayPhilly Materials Science and Engineering Day
a Penn, Drexel & WHYY event on Saturday, February 5, 2011


Physical Review Focus article on How Thin Films MeltPhysical Review Focus
article on "How Thin Films Melt", Arjun Yodh and Yilong Han


Percec, Science Mag. May 2010SCIENCE MAGAZINE (5/21/10)
Self-Assembly of Janus Dendrimers into Uniform Dendrimersomes and Other Complex Architectures, Hammer/Percec/Klein


Nanotechnologists at Penn and Columbia Reveal the Frictional Characteristics of Atomically Thin SheetsNanotechnologists at Penn and Columbia Reveal the Frictional Characteristics of Atomically Thin Sheets

Soft Matter Cover / April 7, 2010
Soft Matter Cover / April 7, 2010

 

Centimeter-scale Binary Nanocrystal Superlatices
The group of Prof. Chris Murray (Chemistry and Materials Science) has created a method to rapidly grow centimeter-scale membranes of binary nanocrystal superlattices by crystallizing a mixture of nanocrystals on a liquid surface. In a MRSEC collaboration involving the group of Prof. Jay Kikkawa (Physics) and the Property Measurement Shared Equipment Facility, they have studied the hybrid magnetic properties of these new materials.
[ press release ] [ Nature article ] [ Army Research Office ]


Dendrimersomes Debut

Dendrimersomes Debut
Supramolecular Chemistry: Self-assembled dendrimer-based structures could deliver drugs, other substances. Virgil Percec
[ C&EN Latest News ]


Janus Dendrimers

LRSM work on the Janus dendrimers is highlighted on NSF home page
LRSM work on the Janus dendrimers is highlighted on NSF.GOV


Science, May 2010

Percec, Science Mag. May 2010 SCIENCE MAGAZINE (5/21/10)
Self-Assembly of Janus Dendrimers into Uniform Dendrimersomes and Other Complex Architectures, Hammer/Percec/Klein


COMPASS (Complex Assemblies of Soft Matter)
1st COMPASS Symposium, April 29, 2010

Burstein Lecture / 2010
Burstein Lecture Series in Materials Science

Arjun Yodh Photo credit: Candace diCarlo

Arjun Yodh

The James M. Skinner Professor of Science, and newest director if the LRSM featured in the Penn Current.