10-01 :: January 2010
nanotimes
39
News in Brief
Samuel I. Stuppa and his team from the North- based solely on solution-processable carbon-based
western University, USA, report in PNAS on a materials. Results are low-voltage, inexpensive,
coassembly system of peptide amphiphile (PA) and efficient light-emitting devices without metals.
molecules designed to form nanofibers for carti-
lage regeneration by displaying a high density of Piotr Matyba, Hisato Yamaguchi, Goki Eda, Manish Chho-
binding epitopes to transforming growth factor β-1 walla, Ludvig Edman, and Nathaniel D. Robinson: Gra-
(TGFβ-1). Growth factor release studies showed phene and Mobile Ions: The Key to All-Plastic, Solution-
that passive release of TGFβ-1 was slower from PA Processed Light-Emitting Devices, In: ACS Nano ASAP,
gels containing the growth factor binding sites. The February 4, 2010, DOI:10.1021/nn9018569:
research results demonstrate the potential of a

http://pubs.acs.org/doi/abs/10.1021/nn9018569
completely synthetic bioactive biomaterial as a
therapy to promote cartilage regeneration.
Ramille N. Shaha,b, Nirav A. Shahc, Marc M. Del Rosa- Researchers from Stanford University presented
rio Limd, Caleb Hsieha,b, Gordon Nubere, and Samuel in PNAS a highly conductive paper for energy-
I. Stuppa: Supramolecular design of self-assembling na- storage devices. Paper is explored in this study as
nofibers for cartilage regeneration, In: PNAS Early Edition, a platform for energy-storage devices by integrati-
February 1, 2010, DOI:10.1073/pnas.0906501107: on with 1D nanomaterials. Commercially available
http://dx.doi.org/10.1073/pnas.0906501107 paper can be made highly conductive with a sheet
resistance as low as 1 ohm per square (Ω/sq) by
using simple solution processes to achieve con-
Scientists at Linköping University and Umeå formal coating of single-walled carbon nanotube
University, in Sweden, and Rutgers, The State (CNT) and silver nanowire films.
University of New Jersey, USA, are presenting an Liangbing Hua, Jang Wook Choia, Yuan Yanga, Sang-
alternative to OLEDs, an organic light-emitting moo Jeongb, Fabio La Mantiaa, Li-Feng Cuia and Yi Cuia:
electrochemical cell (LEC). It is inexpensive to Highly conductive paper for energy-storage devices, In:
produce, and the transparent electrode is made of PNAS Early Edition, December 7, 2009, DOI:10.1073/
the carbon material graphene. pnas.0908858106:

http://dx.doi.org/10.1073/pnas.0908858106
They utilize chemically derived graphene for the
transparent cathode in an all-plastic sandwich-
structure device, similar to an OLED, called a
light-emitting electrochemical cell (LEC). Using a
screen-printable conducting polymer as a partially
transparent anode and a micrometer-thick active
layer solution-deposited from a blend of a light-
emitting polymer and a polymer electrolyte, the
researchers demonstrate a light-emitting device
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