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41.
Hobbie EK Bauer BJ Stephens J Becker ML McGuiggan P Hudson SD Wang H 《Langmuir : the ACS journal of surfaces and colloids》2005,21(23):10284-10287
Single-walled carbon nanotubes (SWNTs) are dispersed in water via wrapping with short segments of single-stranded DNA (ssDNA). Small angle neutron scattering suggests a power-law exponent that is consistent with clustered nanotubes and hence marginal stability. The SWNT-ssDNA complex is used to stabilize dispersions of hydrophilic colloidal particles with the nanotubes adhered to the surface of the colloids. Near-infrared fluorescence microscopy demonstrates the interfacial band-gap fluorescence of these SWNT-coated particles, suggesting potential routes to novel platforms and applications. 相似文献
42.
We report an elastic instability associated with flow-induced clustering in semidilute non-Brownian colloidal nanotubes. Rheo-optical measurements are compared with simulations of mechanical flocculation in sheared fiber suspensions, and the evolving structure is characterized as a function of confinement and shear stress. The transient rheology is correlated with the evolution of highly elastic vorticity-aligned aggregates, with the underlying instability being somewhat ubiquitous in complex fluids. 相似文献
43.
We measure the anisotropy of sheared carbon-nanotube suspensions for a broad range of concentration, aspect ratio, and strain rate using a variety of methods. Our measurements highlight the importance of excluded-volume interactions in the semidilute regime, with scaling in terms of a dimensionless shear rate. Our results also suggest that such interactions might be exploited to fractionate carbon nanotubes by length in simple shear flow. 相似文献
44.
Fagan JA Simpson JR Landi BJ Richter LJ Mandelbaum I Bajpai V Ho DL Raffaelle R Walker AR Bauer BJ Hobbie EK 《Physical review letters》2007,98(14):147402
We report measurements of the full intrinsic optical anisotropy of isolated single-wall carbon nanotubes (SWNTs). By combining absorption spectroscopy with transmission ellipsometry and polarization-dependent resonant Raman scattering, we obtain the real and imaginary parts of the SWNT permittivity from aligned semiconducting SWNTs dispersed in stretched polymer films. Our results are in agreement with theoretical predictions, highlighting the limited polarizability of excitons in a quasi-1D system. 相似文献
45.
Dmitrijs Lubriks Klara Haldimann Fatmanur Kiliç Maximilian Hartmann Erik C. Böttger Sven N. Hobbie Edgars Suna David Crich 《Helvetica chimica acta》2023,106(11):e202300138
We report the synthesis and evaluation of two new apramycin 5-O-β-d -ribofuranosides, or apralogs, carrying aminoalkyl branches at the ribofuranose 4-position. This novel modification conveys excellent activity for the inhibition of protein synthesis by wild-type bacterial ribosomes and correspondingly high antibacterial activity against several Gram-negative pathogens. Notably, these new modifications overcome the reduction of antibacterial activity in other 2-deoxystreptamine-type aminoglycosides carrying a 5-O-ribofuranosyl moiety when challenged by the presence of an aminoglycoside phosphotransferase enzyme capable of acting on the ribose 5-position. 相似文献
46.
Fagan JA Landi BJ Mandelbaum I Simpson JR Bajpai V Bauer BJ Migler K Walker AR Raffaelle R Hobbie EK 《The journal of physical chemistry. B》2006,110(47):23801-23805
Model composites of DNA-wrapped single-wall carbon nanotubes in poly(acrylic acid) are used to evaluate metrics of nanotube dispersion. By varying the pH of the precursor solutions, we introduce a controlled deviation from ideal behavior. On the basis of small-angle neutron scattering, changes in near-infrared fluorescence intensity are strongly correlated with dispersion, while optical absorption spectroscopy and resonant Raman scattering are less definitive. Our results represent the first systematic comparison of currently accepted measures of nanotube dispersion. 相似文献