Reduced graphene oxide (RGO) and silver nanoparticle (AgNP) hybrids (RGO-AgNP) were prepared by a facile one-pot method using Poly (N-vinyl-2-pyrrolidone) as reductant and stabilizer. Folic acid (FA) molecules were attached to the RGO-AgNP by physisorption for targeting specific cancer cells with folate receptors (FRs) and using as Raman reporter molecules. The internalization of the FA loaded RGO-AgNP (RGO-AgNP-FA) inside the FRs-positive cancer cell was confirmed by confocal laser scanning and transmission electron microscopy. The Raman signals of the FA in live cancer cells were detected by confocal Raman spectroscope at 514 nm excitation, indicating that the RGO-AgNP-FA material has great potential as a Raman probe for cancer diagnosis in vitro.
Morphology, mechanical behavior and other properties of isotactic polypropylene (iPP) and poly(phenylene oxide) (PPO) blends were studied. Large PPO particle sizes or delamination were found in binary iPP/PPO blends when no compatibilizers were added, while fracture toughness of the binary alloy was higher than that of both pure iPP and PPO. The addition of compatibilizers, triblock copolymers SEBS and SEPS, tremendously improved PPO particle dispersion and particle-matrix interfacial adhesion in iPP. The results of mechanical properties of the ternary iPP/PPO/ compatibilizer blends showed that the compatiblization of SEPS is better than that of SEBS.
Isotactic poly(4-methyl-1-pentene) (PMP) is a semicrystalline polyolefin with many unique properties. The crystallization theory of pure PMP had been well studied based on its molecular structure. In this study, the crystallization behavior and compatibility of PMP/polypropylene (PP) blends were investigated by differential scanning calorimetry, x-ray diffraction, scanning electron microscopy (SEM), and mechanical testing. It was found that the PP crystallization behavior was strongly affected by the presence of PMP in the blend: first, PMP crystallized and then acted as nucleating agent during the crystallization process of PP at lower temperature. In contrast, the influence of PP on the crystallization of PMP was relatively small due to the wide disparity of the melting temperatures of PMP and PP. The fracture morphology observed by SEM showed that there was no obvious phase separation structure in the blends; but the mechanical properties of PP/PMP blends are not good as expected for an ideal homogenous mixture.
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