Ali Rouhanipour

Two-dimensional graphene nanoribbons

A new synthetic strategy toward novel linear two-dimensional graphene nanoribbons up to 12 nm has been established. The nanoribbons are characterized by MS, UV/vis, and scanning tunneling microscopy (STM). Various microscopic studies of these novel structures showed a high tendency to self-assemble.

Fine-tuning DNA/albumin polyelectrolyte interactions to produce the efficient transfection agent cBSA-147

We present the preparation and isolation of different chemically modified BSA species with varying numbers of primary amino groups at the surface. Highly cationic albumin proteins with increased numbers of amino groups were achieved and complex formation with plasmid DNA was carefully investigated. We compare the transfection results, polyelectrolyte complexes morphologies with their impact on complex stabilities, cytotoxicities and DNA accessibility. This knowledge-driven approach led to the identification of the efficient non-viral DNA delivery agent cBSA-147, which showed high transfection efficacies and stability.

Subliming the Unsublimable: How to Deposit Nanographenes

Quite sublime: Thin-layer fabrication of unsublimable large polycyclic aromatic hydrocarbons (PAHs) by pulsed laser deposition was used to prepare samples for scanning tunneling microscopy. Giant PAHs with up to 222 carbon atoms can be visualized-a size that was previously not possible because of the lack of suitable deposition methods.

Soft deposition of organic macromolecules with fast atom bombardment mass spectrometry

In order to investigate the requirements for soft deposition of intact positively charged organic macromolecules, an homogenous series of modal compounds such as polyphenylene dendronized perylenes (PDPs), C80H52, C200H132 and C320H212 and a series of derivatives involving perylene derivative, C98H104N8O4, terrylene derivative, C78H82N6O4 and quaterrylene derivative, C140H138N10O8, were used for soft-landing experiments on a metallic or matrix coated surface using fast atom bombardment mass spectrometry. Soft-landing can be achieved at impact energies below 180 eV with no production of fragments. The deposition rate shows strong energy dependence with similar behavior of the different organic compounds. A single isotope of the molecule was selected and soft-landed at increased resolution.

High-performance organic field-effect transistors, textured by self-assembly

FA4-MS04-P11 High Performance Organic Field Effect Transistors, Textured by Self-assembly. Jens W. Andreasena, Claudia M. Duffyb, Hoi N. Tsaoc, Dag W. Breibyd, Wojciech Pisulac, Masahiko Andoe, Takashi Minakataf, Don Choc, Ali Rouhanipourc, Martin M. Nielseng, Henning Sirringhausb, Klaus Müllenc. aSolar Energy Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark. bOptoelectronics Group, Cavendish Laboratory, University of Cambridge. cMax Planck Institute for Polymer Research. dDepartment of Physics, Norwegian University of Science and Technology. eHitachi Cambridge Laboratory. fAsahiKASEI Corporation. gCentre for Molecular Movies, Niels Bohr Institute, University of Copenhagen. E-mail: jewa@risoe.dtu.dk