Synthesis of cobalt oxide aerogels and nanocomposite systems containing single‐walled carbon nanotubes

Abstract

Summary:The synthesis and characterization of porous nanostructured cobalt oxide (Co 3 O 4 ) aerogels using epoxide addition method is described. Cobalt-containing monoliths were obtained by sol-gel processing of an alcoholic cobalt chloride solution with propylene oxide as the gelation agent. The alcogels were dried by supercritical CO 2 fluid extraction to obtain the highly porous amorphous cobalt (II) aerogels. To enhance and control the structural properties of the aerogels, single-walled carbon nanotubes (SWCNT) were incorporated into the cobalt (II) aerogel network to form a homogenous composite material. The resulting materials were characterized using powder X-ray diffraction and nitrogen adsorption/desorption analysis. The detailed microstructure of aerogel networks was investigated using scanning and transmission electron microscopy, which showed significant structural changes induced by the incorporation of SWCNT to the cobalt aerogel. Annealing of the aerogel materials at 6001C yields a highly crystalline well-faceted Co 3 O 4 network SCANNING 31: 132-138, 2009. r

Influence of PEI as a core modifying agent on PLGA microspheres of PGE1, a pulmonary selective vasodilator

“…Surface area, pore volume, and pore radii were determined using a Nova 3200e surface area analyzer (Gill et al, 2009). The surface area increased as a function of PEI and PVA concentrations.…”

“…After generation of the isotherm, surface areas of all the microparticulate formulations were evaluated by using Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) adsorption isotherms. The average pore radius and cumulative pore volumes were calculated from the desorption curve of BJH isotherm from a range of desorption points (Gill et al, 2009). The analysis was performed in triplicates for 24 hours with a 150 s equilibrium interval.…”

PLGA Microparticles Encapsulating Prostaglandin E1-Hydroxypropyl-β-cyclodextrin (PGE1-HPβCD) Complex for the Treatment of Pulmonary Arterial Hypertension (PAH)

“…Each sample was run for 24 hours with a 150-second equilibrium interval to obtain Brunauer-Emmett-Teller (BET) and Barrett-JoynerHalenda (BJH) isotherms. Average surface areas (m 2 /g) for all microparticulate formulations were determined by both BET and BJH isotherms, whereas average pore volumes (cm 3 /g) and pore radii (Å) were determined using the desorption branch of the BJH isotherm (28).…”

Diethylenetriamine (DETA)-assisted anchoring of Co3O4nanorods on carbon nanotubes as efficient electrocatalysts for the oxygen evolution reaction

“…As such, we expect that Co 3 O 4 nanorods anchored on CNTs should generate a novel composite with promising OER performance. So far, only nanoparticles 18,19,[30][31][32] or other irregular structured [33][34][35] Co 3 O 4 in Co 3 O 4 -CNT composites have been reported. Therefore, it is of scientic signicance to realize the anchoring of the 1D Co 3 O 4 nanorod on the 1D CNT towards electrochemical water oxidation, while the technique still remains challenging.…”