A simple model is developed to predict the complex mechanical properties of carbon nanotube sheets (buckypaper) [Hall et al., Science 320 504 (2008)]. Fabricated using a similar method to that deployed for making writing paper, these buckypapers can have in-plane Poisson's ratios changed from positive to negative, becoming auxetic, as multiwalled carbon nanotubes are increasingly mixed with single-walled carbon nanotubes. Essential structural features of the buckypapers are incorporated into the model: isotropic in-plane mechanical properties, nanotubes preferentially oriented in the sheet plane, and freedom to undergo stress-induced elongation by both angle and length changes. The expressions derived for the Poisson's ratios enabled quantitative prediction of both observed properties and remarkable new properties obtainable by structural modification.

PACS 84.60. Jt, 85.35.Kt In this study, an oriented, strong and transparent multiwall carbon nanotube sheet is used as the hole collecting electrode in polymer solar cells with RR-P3HT as the donor material and PCBM as the acceptor material. An open circuit voltage of 0.49 V, a short circuit current of 5.47 mA/cm 2 , a fill factor of 0.49, and an efficiency of 1.32% have been obtained. Performance dependence on incident light intensity along with other various investigations are presented.

No abstract

phenotype. We confirmed the over-expression of CD163 in M1 macrophages at 48 and 72 hours after transfection. Using an in vitro scratch assay we also observed that the addition of CD163-blocking antibody, but not isotype control, blocked the efficient and faster wound healing process induced by CD163-overexpressing macrophages. Moreover, the interaction among keratinocytes, fibroblasts and CD163-overexpressing macrophages resulted in an increased CD163 gene expression in these macrophages. CD163 seems to play a critical role in the induction of wound healing by promoting an anti-inflammatory phenotype in macrophages. We further postulate that this approach could promote a more efficient wound healing process following major surgeries, which would reduce the incidence of chronic postoperative pain.

Well-ordered aligned arrays of multiwalled carbon nanotubes were synthesized by the catalytic thermal chemical vapor deposition (CVD) in acetylene gas at the atmospheric pressure. Abrupt spark-type light emission spots and release of the carbon nanotubes from the cathode and succeeding deposition onto the anode without decomposition has been detected above the threshold electron emission current. Spectral analysis of the light showed that the spectra consist of a background similar to blackbody radiation and a set of sharp lines identified with the radiative transitions of excited carbon and iron atoms. Light emission spectra were found to be essentially different depending on the type (AC or DC) of the applied bias voltage and its value. As-grown and re-deposited materials were characterized by Raman spectroscopy and scanning electron microscopy. It was found that the structural properties of the re-deposited carbon nanotubes remained intact, with only negligible amorphization. A mechanism of the spark emission and re-deposition processe is proposed and discussed in terms of fast overheating of CNT, after explosion type melting of Fe-catalyst nanoclusters, followed by CNT transfer from cathode to anode .

phenotype. We confirmed the over-expression of CD163 in M1 macrophages at 48 and 72 hours after transfection. Using an in vitro scratch assay we also observed that the addition of CD163-blocking antibody, but not isotype control, blocked the efficient and faster wound healing process induced by CD163-overexpressing macrophages. Moreover, the interaction among keratinocytes, fibroblasts and CD163-overexpressing macrophages resulted in an increased CD163 gene expression in these macrophages. CD163 seems to play a critical role in the induction of wound healing by promoting an anti-inflammatory phenotype in macrophages. We further postulate that this approach could promote a more efficient wound healing process following major surgeries, which would reduce the incidence of chronic postoperative pain.

No abstract