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Search for "diffusion coefficient" in Full Text gives 81 result(s) in Beilstein Journal of Nanotechnology.

Reduced electron recombination of dye-sensitized solar cells based on TiO2 spheres consisting of ultrathin nanosheets with [001] facet exposed

  • Hongxia Wang,
  • Meinan Liu,
  • Cheng Yan and
  • John Bell

Beilstein J. Nanotechnol. 2012, 3, 378–387, doi:10.3762/bjnano.3.44

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  • recombination rate compared to the conventional TiO2 nanoparticles. In contrast, the effective electron diffusion coefficient, Dn, was not sensitive to the variation of the TiO2 morphology. The TiO2 spheres showed the same Dn as that of the nanoparticles. The influence of TiCl4 post-treatment on the conduction
  • IMVS, the advantage of the EIS method for characterization of DSCs lies in the fact that both the effective electron lifetime, τn, and the effective electron diffusion coefficient, Dn, can be obtained in one measurement. This is achieved by fitting the EIS spectrum using a suitable equivalent circuit
  • -recombination process in DSCs is reflected by the effective electron lifetime, τn, whereas the electron-transport process is manifested by the effective electron diffusion coefficient Dn. Bisquert et al. showed that both τn and Dn of a DSC are dependent on the distribution of the density of electrons in the
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Published 07 May 2012

Ultraviolet photodetection of flexible ZnO nanowire sheets in polydimethylsiloxane polymer

  • Jinzhang Liu,
  • Nunzio Motta and
  • Soonil Lee

Beilstein J. Nanotechnol. 2012, 3, 353–359, doi:10.3762/bjnano.3.41

Graphical Abstract
  • polymer structure that is highly permeable. PDMS has a high oxygen permeability due to the large free volume from the flexibility of the siloxane (–SiO–) linkages; the oxygen concentration in PDMS has been reported as 2 mM [23]. The diffusion coefficient of oxygen in PDMS is reported as 3.55 × 10−5 cm2·s
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Published 02 May 2012

An NC-AFM and KPFM study of the adsorption of a triphenylene derivative on KBr(001)

  • Antoine Hinaut,
  • Adeline Pujol,
  • Florian Chaumeton,
  • David Martrou,
  • André Gourdon and
  • Sébastien Gauthier

Beilstein J. Nanotechnol. 2012, 3, 221–229, doi:10.3762/bjnano.3.25

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  • that the molecules diffuse by successive hopping of CN groups from one K+ to another in a way that is similar to the "walking" of the truxene-derived molecule described recently [10]. To get an order of magnitude for the diffusion coefficient, we observe that the molecule travels approximately 1 nm in
  • molecule by the electrostatic interaction of the cyano groups with K+ ions. HCPTP was designed with its six CN groups to limit the diffusion of the molecule on the KBr(001) surface. What the present study demonstrates is that maximizing the adsorption energy does not necessarily imply a low diffusion
  • coefficient. There is in fact no simple relation between adsorption and diffusion energy, especially for large molecules with numerous degrees of freedom [32]. Moreover, a high adsorption energy is likely to induce surface restructuring, as observed in the present case. While such processes could be useful to
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Published 12 Mar 2012

Formation of SiC nanoparticles in an atmospheric microwave plasma

  • Martin Vennekamp,
  • Ingolf Bauer,
  • Matthias Groh,
  • Evgeni Sperling,
  • Susanne Ueberlein,
  • Maksym Myndyk,
  • Gerrit Mäder and
  • Stefan Kaskel

Beilstein J. Nanotechnol. 2011, 2, 665–673, doi:10.3762/bjnano.2.71

Graphical Abstract
  • : where k is the rate of the surface reaction with the nanoparticle, D the diffusion coefficient of the educt species in the (atmospheric) gaseous plasma, pv is given by the Gibbs–Thompson law, and again p"SiC" can be approximated based on the concentration of the precursor for the nanoparticle. The
  • nanoparticle for a large supersaturation of the system p"SiC" >> pv, as depicted in Figure 2: The high ambipolar diffusion coefficient of the species in the plasma results in the fast growth of the particle accompanied by the fast depletion of the educt in the plasma, which of course contradicts the simple
  • the argon plasma causes a higher plasma temperature, and also a higher neutral gas temperature and, secondly, helps to decrease the carbon content in the argon plasma. Addition of hydrogen into the argon plasma will also increase the reaction rate owing to a higher diffusion coefficient of the species
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Published 07 Oct 2011

Characterization of protein adsorption onto FePt nanoparticles using dual-focus fluorescence correlation spectroscopy

  • Pauline Maffre,
  • Karin Nienhaus,
  • Faheem Amin,
  • Wolfgang J. Parak and
  • G. Ulrich Nienhaus

Beilstein J. Nanotechnol. 2011, 2, 374–383, doi:10.3762/bjnano.2.43

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  • scale of diffusion, τD. Based on the well-known spatial extension of the observation volume, the diffusion coefficient, D, and, by using the Stokes–Einstein equation (see Experimental), the hydrodynamic radius of the fluorescent particle, RH, can be calculated. Consequently, a NP size increase due to
  • experiments and accounted for in the determination of the diffusion coefficient, D, according to the Stokes–Einstein relation, with hydrodynamic radius RH, Boltzmann constant kB, temperature T, and viscosity η. Three independent series of measurements were taken and averaged. Data analysis In conventional FCS
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Published 12 Jul 2011

Preparation and characterization of supported magnetic nanoparticles prepared by reverse micelles

  • Ulf Wiedwald,
  • Luyang Han,
  • Johannes Biskupek,
  • Ute Kaiser and
  • Paul Ziemann

Beilstein J. Nanotechnol. 2010, 1, 24–47, doi:10.3762/bjnano.1.5

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Published 22 Nov 2010
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