ChemPhysChem

Cover image for Vol. 10 Issue 15

October 19, 2009

Volume 10, Issue 15

Pages 2549–2735

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Cover Picture: Novel Multifunctional Micro-Ampoules for Structuring and Encapsulation (ChemPhysChem 15/2009) (page 2549)

      Andrew L. Campbell, Simeon D. Stoyanov and Vesselin N. Paunov

      Version of Record online: 19 OCT 2009 | DOI: 10.1002/cphc.200990061

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      Scientists from University of Hull in UK and Unilever Research in The Netherlands have developed novel micro-ampoules made from edible materials, having multiple compartments loaded with oils. The micro-ampoules are prepared using a single-step, in-shear solvent-attrition liquid–liquid dispersion technique, allowing control of particle morphology, as described by V. N. Paunov et al. on p. 2599. Due to their shape, size and surface properties they can adsorb at oil–water or air–water interfaces and could have a dual functionality for foam or emulsion stabilization and encapsulation and delivery simultaneously. Such micro-ampoules can find applications in the pharmaceutical, nutraceutical, personal care and food industries.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Inside Cover: Ensemble Measurement of Diffusion: Novel Beauty and Evidence (ChemPhysChem 15/2009) (page 2550)

      Christian Chmelik, Lars Heinke, Pavel Kortunov, Jing Li, David Olson, Despina Tzoulaki, Jens Weitkamp and Jörg Kärger

      Version of Record online: 12 OCT 2009 | DOI: 10.1002/cphc.200990062

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      With interference microscopy and infrared micro-imaging, recently introduced into the investigation of mass transfer phenomena in nanoporous materials, unprecedented details on molecular diffusion are accessible, as shown by J. Kärger et al. on p. 2623. The picture shows the evolution of intracrystalline guest concentration after a pressure step in the surrounding atmosphere.

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
  4. News

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
  5. Review

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Hydrogen Storage Mediated by Pd and Pt Nanoparticles (pages 2566–2576)

      Miho Yamauchi, Hirokazu Kobayashi and Hiroshi Kitagawa

      Version of Record online: 12 OCT 2009 | DOI: 10.1002/cphc.200900289

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      Convenience stores: Hydrogen atoms are stored in metal nanoparticles under mild conditions. Novel hydrogen absorption sites form in the hetero-interface that forms between the Pd core and Pt shell of the Pd/Pt core/shell-type bimetallic nanoparticles (see figure). It is proposed that the potential formed in the hetero-interface stabilizes hydrogen atoms rather than interstitials in the Pd core and Pt shells.

  6. Minireview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
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    1. Photoswitchable Fluorescent Nanoparticles: Preparation, Properties and Applications (pages 2577–2591)

      Zhiyuan Tian, Wuwei Wu and Alexander D. Q. Li

      Version of Record online: 10 SEP 2009 | DOI: 10.1002/cphc.200900492

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      Little chameleons: Photoswitchable fluorescent nanoparticles enable live-cell imaging with nanometer resolution (see picture). This Minireview summarizes the synthetic strategies, fluorescence photoswitching properties, and the emerging applications of such novel nanoparticles.

  7. Highlight

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Processive Motion of Bipedal DNA Walkers (pages 2593–2597)

      Friedrich C. Simmel

      Version of Record online: 8 SEP 2009 | DOI: 10.1002/cphc.200900493

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      Made for walking: Using DNA base-pairing interactions alone, recently several examples of bipedal DNA walkers have been demonstrated experimentally (see picture). The walkers display coordinated leg movement and are able to walk processively on a supramolecular track. To achieve this behavior, the kinetics of the hybridization reactions involved in each case is intricately designed.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Novel Multifunctional Micro-Ampoules for Structuring and Encapsulation (pages 2599–2602)

      Andrew L. Campbell, Simeon D. Stoyanov and Vesselin N. Paunov

      Version of Record online: 19 AUG 2009 | DOI: 10.1002/cphc.200900317

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      Micro-ampoules: A novel method for the scalable fabrication of micro-rod-capsules made from edible materials is described. The capsules closely resemble ampoules by having multiple compartments loaded with oils (see picture). Such novel micro-ampoules could find application in the pharmaceutical, nutraceutical or food industries.

    2. Numerous Isomers of Serine Octamer Ions Characterized by Infrared Photodissociation Spectroscopy (pages 2603–2606)

      Xianglei Kong, Cheng Lin, Giuseppe Infusini, Han-Bin Oh, Honghai Jiang, Kathrin Breuker, Chih-Che Wu, Oleg P. Charkin, Huan-Cheng Chang and Fred W. McLafferty

      Version of Record online: 2 SEP 2009 | DOI: 10.1002/cphc.200900564

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      Building block of life? Infrared photodissociation spectroscopy shows at least six stable (Ser8+H)+ isomers. While retaining the chiral selectivity of the zwitterionic core, these vary mainly in H-bonding of their peripheral O[BOND]H groups (see picture). This could allow incorporation of any other amino acid to make these isomers unique for prebiotic selectivity of L-amino acids for proteins.

    3. Magnetic Alignment in Solid State and Temperature Hysteresis in Aqueous Tetrahydrofuran Solution for Tetrathiafulvaleno[18]annulenes (pages 2607–2611)

      Hideo Enozawa, Masashi Hasegawa, Eigo Isomura, Tohru Nishinaga, Tadashi Kato, Masafumi Yamato, Tsunehisa Kimura and Masahiko Iyoda

      Version of Record online: 13 AUG 2009 | DOI: 10.1002/cphc.200900545

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      Substituted [18]annulene-hexaesters have a multi-functionality that is sensitive to small differences in the ester side chain. Self-aggregation of the [18]annulenes in THF–H2O (v/v, 1:1) either produce a fibrous structure or resulte in temperature hysteresis of the color (see picture) and the 1H NMR signals. This is due both to strong self-aggregation behavior and unique cluster formation in a binary solution of THF and water.

    4. Controlled Synthesis of III–V Quantum Dots in Microfluidic Reactors (pages 2612–2614)

      Adrian M. Nightingale and John. C. de Mello

      Version of Record online: 7 AUG 2009 | DOI: 10.1002/cphc.200900462

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      Defined properties: Microfluidic reactors have recently emerged as near-ideal systems for the growth of high quality colloidal nanoparticles due to the unprecedented control they offer over reaction conditions (see figure). High quality InP quantum dots are synthesized in simple microfluidic devices, and their spectral characteristics are easily tuned.

    5. Lipid-Modulated Pharmacophore Nanorods Assembled at the Air/Water Interface (pages 2615–2619)

      Liron Philosof-Mazor, Roman Volinsky, Jurgen Jopp, Peter Blumberg, Hanna Rapaport, Victor E. Marquez and Raz Jelinek

      Version of Record online: 11 AUG 2009 | DOI: 10.1002/cphc.200900539

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      Biomimetic pharmacophores deposited at the air/water interface self-assemble into distinct crystalline nanostructures (see figure). The shapes and dimensions of the nanostructures are significantly modulated by the lipid environments in mixed lipid/DAG-lactone monolayers.

    6. Thousand-Fold Acceleration of Phase Decomposition in Polymer/Liquid Crystal Blends (pages 2620–2622)

      Natalia Ziębacz, Stefan A. Wieczorek, Tomasz Szymborski, Piotr Garstecki and Robert Hołyst

      Version of Record online: 31 JUL 2009 | DOI: 10.1002/cphc.200900505

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      Pulling apart: The authors demonstrate experimentally that oscillating electric fields can be used to accelerate the rate of phase separation by up to three orders of magnitude (see picture), and to change the character of the phase-separation process from a power to exponential evolution of the mean size of the domains.

  9. Articles

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Ensemble Measurement of Diffusion: Novel Beauty and Evidence (pages 2623–2627)

      Christian Chmelik, Lars Heinke, Pavel Kortunov, Jing Li, David Olson, Despina Tzoulaki, Jens Weitkamp and Jörg Kärger

      Version of Record online: 11 SEP 2009 | DOI: 10.1002/cphc.200900489

      Thumbnail image of graphical abstract

      Seeping in: With interference microscopy and infrared micro-imaging, recently introduced into the investigation of mass-transfer phenomena in nanoporous materials, unprecedented details on molecular diffusion are accessible. The picture shows transient maxima of intracrystalline guest concentrations.

    2. Uniform Mesoporous Silica Hexagon and Its Two-Dimensional Colloidal Crystal (pages 2628–2632)

      Yu-Shen Lin, Chun-Yi David Lu, Yann Hung and Chung-Yuan Mou

      Version of Record online: 18 SEP 2009 | DOI: 10.1002/cphc.200900251

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      Superstructures: Well-ordered mesoporous silica colloids of uniform hexagonal shape are synthesized and can be arranged in hierarchical 2D ordered periodical super-structured colloidal crystals (see figure). A statistical mechanical cell model analyses the interesting packing structure, including osmotic bulk modulus, phase separation and defects in these structures.

    3. Rectification in Supramolecular Zinc Porphyrin/Fulleropyrrolidine Dyads Self-Organized on Gold(111) (pages 2633–2641)

      Francesca Matino , Valentina Arima, Manuel Piacenza, Fabio Della Sala, Giuseppe Maruccio, Ray J. Phaneuf , Roberta Del Sole, Giuseppe Mele, Giuseppe Vasapollo, Giuseppe Gigli, Roberto Cingolani and Ross Rinaldi

      Version of Record online: 23 SEP 2009 | DOI: 10.1002/cphc.200900371

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      Molecular rectification with higher tunneling currents at positive voltage is exhibited by donor–acceptor dyads in which a fulleropyrrolidine is axially ligated to a zinc porphyrin self-organized on a 4-aminothiophenol self-assembled monolayer on Au(111) [see picture for the I/V curve and structure]. Higher currents at positive voltages indicate an easier tunneling for electrons moving from the acceptor side of the dyads to the donor side.

    4. Effect of Film Thickness on the Columnar Packing Structures of Discotic Supramolecules in Thin Films (pages 2642–2646)

      Hyo-Sik Kim, Sung-Min Choi, Brian D. Pate and Po Gyu Park

      Version of Record online: 18 SEP 2009 | DOI: 10.1002/cphc.200900464

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      Tilted alignment: Thin films (<100 nm) composed of uniaxially aligned columnar layers of a discotic mesogen on octadecyltrichlorosilane-functionalized solid substrates show undistorted two-dimensional columnar rectangular structures (see figure). In thicker films, symmetric tilting of the columnar layer orientation occurs as a result of longitudinal edge dislocations induced by accumulated elastic deformation.

    5. Preferred Hydrogen Adsorption Sites in Various MOFs—A Comparative Computational Study (pages 2647–2657)

      Michael Fischer, Frank Hoffmann and Michael Fröba

      Version of Record online: 18 SEP 2009 | DOI: 10.1002/cphc.200900459

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      Force-field based grand-canonical Monte Carlo simulations are used to predict the preferential adsorption sites of hydrogen in metal-organic frameworks. Capabilities and limitations of the methodology are critically discussed. A particular focus is put on the structure–property relationships, identifying structural features that are most favourable for hydrogen adsorption.

    6. An Excursion from Normal to Inverted C[BOND]C Bonds Shows a Clear Demarcation between Covalent and Charge-Shift C[BOND]C Bonds (pages 2658–2669)

      Sason Shaik, Zhenhua Chen, Wei Wu, Amnon Stanger, David Danovich and Philippe C. Hiberty

      Version of Record online: 12 OCT 2009 | DOI: 10.1002/cphc.200900633

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      Two of a kind: Like in a phase diagram, 16 C[BOND]C bonds separate into two bond families (see picture), namely classical covalent bonds, where bonding arises from spin pairing, and charge-shift bonds, where spin pairing is destabilizing and bonding arises from the covalent–ionic resonance energy.

    7. SERS in Salt Wells (pages 2670–2673)

      G. V. Pavan Kumar and Joseph Irudayaraj

      Version of Record online: 11 SEP 2009 | DOI: 10.1002/cphc.200900634

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      Salty SERS: Microscopic containers of nanoparticles are shown to self-assemble in salt wells (see picture). These microwells loaded with plasmonic nanoparticles are harnessed for low-volume, highly sensitive surface-enhanced Raman detection of biomolecules, and show immense promise in achieving soft-material platforms for optically assisted proteomics and genomics.

    8. DNA-Based Polymers as Chiral Templates for Second-Order Nonlinear Optical Materials (pages 2674–2678)

      Duangporn Wanapun, Victoria J. Hall, Nathan J. Begue, James G. Grote and Garth J. Simpson

      Version of Record online: 29 SEP 2009 | DOI: 10.1002/cphc.200900303

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      Intrinsic chirality of DNA: DNA treated with the surfactant cetyltrimethylammonium forms films that are active for coherent second harmonic generation (SHG). Doping the DNA films with crystal violet increases the efficiency of SHG, but does not significantly alter the polarization dependence, which suggests that the SHG produced upon doping arises from the same chiral-specific origin, templated by the DNA.

    9. From the SmA to the Hexatic, Including the SmC*, SmC*A and SmC*re Phases: A 2H NMR Relaxation Study (pages 2679–2691)

      Valentina Domenici, Alberto Marini, Carlo A. Veracini, Corrado Malanga and Rita Menicagli

      Version of Record online: 2 SEP 2009 | DOI: 10.1002/cphc.200900385

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      A relaxing time study: The dynamics of a liquid-crystalline smectogen in its rich variety of mesophases has been explored by means of spin–lattice (T1Q and T1Z) and spin–spin (T2) 2H NMR relaxation (see picture). A slowdown of dynamic motions affecting both the phenyl and biphenyl moieties is observed that corresponds to the antiferroelectric and re-entrant phases.

    10. Photoactive Nanostructures of Polypyrrole (pages 2692–2697)

      Matthias A. Ruderer, Matthias Hirzinger and Peter Müller-Buschbaum

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/cphc.200900578

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      Easy does it: Simple creation of nanostructures (inset) of the photoactive polymer polypyrrole on a large surface area by using the spin coating method is reported. The influence of confinement on the conjugation length results in a modified absorption behavior (main picture).

    11. Enhancing Electron Collection Efficiency and Effective Diffusion Length in Dye-Sensitized Solar Cells (pages 2698–2702)

      Daniel Kwan-Pang Wong, Chen-Hao Ku, Yen-Ru Chen, Guan-Ren Chen and Jih-Jen Wu

      Version of Record online: 23 SEP 2009 | DOI: 10.1002/cphc.200900393

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      Intensity-modulated photocurrent spectroscopy and intensity-modulated photovoltage spectroscopy results indicate that the electron-transport rate and electron lifetime in a ZnO nanowire/nanoparticle (NW/NP) composite dye-sensitized solar cell (DSSC) are superior to those in a conventional TiO2–NP cell because of the existence of vertical ZnO NWs and insulating layered basic zinc acetate (see figure).

    12. Ultrasonic Spectrometry of Aqueous Solutions of Alkyl Maltosides: Kinetics of Micelle Formation and Head-Group Isomerization (pages 2703–2710)

      Julian Haller  and Udo Kaatze

      Version of Record online: 16 SEP 2009 | DOI: 10.1002/cphc.200900457

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      High-frequency relaxation terms in the ultrasonic spectra of aqueous solutions of alkyl maltosides reveal the conformational variety of the surfactant carbohydrate head groups. A low-frequency term at surfactant concentrations above the critical micelle concentration (cmc; red symbols in figure, c=0.25 mol L−1) reflects monomer exchange between the micelles and the suspending phase.

    13. Visualization of the Local Catalytic Activity of Electrodeposited Pt–Ag Catalysts for Oxygen Reduction by means of SECM (pages 2711–2718)

      Tharamani C. Nagaiah, Artjom Maljusch, Xingxing Chen, Michael Bron and Wolfgang Schuhmann

      Version of Record online: 25 SEP 2009 | DOI: 10.1002/cphc.200900496

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      Pt–Ag co-deposits are prepared by electrodeposition on glassy carbon electrodes. Scanning electrochemical microscopy images of local oxygen reduction at different catalysts illustrate the local catalytic activity (see picture) and confirm that co-deposition of Ag and Pt enhances the catalytic activity for the oxygen reduction reaction.

    14. Estimation of Surface Structure and Carbon Monoxide Oxidation Site of Shape-Controlled Pt Nanoparticles (pages 2719–2724)

      Masashi Nakamura, Yuto Hanioka, Wataru Ouchida, Mami Yamada and Nagahiro Hoshi

      Version of Record online: 2 SEP 2009 | DOI: 10.1002/cphc.200900486

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      Structural estimation: The surface structures and CO oxidation site of shape-controlled Pt nanoparticles are investigated. The planes of the cubic and cuboctahedral nanoparticles are composed of step-terrace and atomically flat terraces, respectively (see picture). Edge sites of Pt nanoparticles promote CO oxidation.

    15. Helical Fibrous Nanostructures Self-Assembled from Metal-Free Phthalocyanine with Peripheral Chiral Menthol Units (pages 2725–2732)

      Wei Lv, Xingcui Wu, Yongzhong Bian, Jianzhuang Jiang and Xiaomei Zhang

      Version of Record online: 18 SEP 2009 | DOI: 10.1002/cphc.200900547

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      Handy helices: (D)- and (L)-enantiomers of a novel metal-free phthalocyanine with four chiral menthol units attached at the peripheral positions have been synthesized. Both enantiomers self-assemble, in a hierarchical manner, into a mixture of nanofibers with both right- and left-handed helicity (see picture).

  10. Preview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Minireview
    8. Highlight
    9. Communications
    10. Articles
    11. Preview
    1. Preview: ChemPhysChem 16/2009 (page 2735)

      Version of Record online: 12 OCT 2009 | DOI: 10.1002/cphc.200990065

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