HR-TEM

This size is larger than the size of the pure PB2 estimated from the AFM observations (i.e., the height of the particles because the width is systematically overestimated by the tip-broadening effect). This difference is consistent with the embedding of the PB2 in the P2VP layer. The core-shell morphology of these particles was confirmed by high resolution TEM (HR TEM). As seen from the Fig. 6,... 

FIGURE 11.2 TEM/HR-TEMmicrographsforsamplesofas-synthesizedPt46Ni22Fe32nanopartides(a,3.0 0.3mn), Pt46Ni22Fe32/C catalysts treated at 800 °C (b-c, 7.8 0.6nm). Reprinted with permission from reference [155]. Copyright (2011) American Chemical Society. 

Fig. 5. The TEM image (A), particle size distribution (inlet) and FTIR spectra (B) of PVA -capped nanoparticles at 5 hrs reaction time.

The TEM image of the PVP capped CdSe at 5 hr in figure 6A showed small, spherical particles with some aggregation. The aggregation is due to the oriented attachment between the spherical nanoparticles as a result of dipole-dipole interactions between the highly... 

Figure 15.1 High resolution transmission electron microscopy images (HR-TEM) of 5 wt% Pd (a) and 50 wt% Pt-Ru (b) particles supported on carbon supports of the Sibunit family with surface areas of about 6m g (a) and 72m g (b). (c) Fourier-transformed image of (b). ((a) Reprinted from Pronkin et al. [2007], Copyright 2007, with permission from Elsevier, (b) and (c) reprinted from Gavrilov et al. [2007]—Reproduced by permission of the PCCP Owner Societies.)...

Fig. 56. TEM images of DNA-linked gold network (a) an assembly of 8 and 30 nm gold particles (b) higher resolution image of (a) (c) control experiment without DNA (d) HR-TEM image of a portion of a hybrid Au/quantum dot (QD) assembly. The lattice fringes of the QDs, which resemble fingerprints, appear near each Au nanoparticle, (e) A satellite structure formed using a 60-fold excess of the 8 nm particles. Reproduced with permission from Ref. (185). Copyright 2000, American Chemical Society.

Figure 2. HR-TEM of SWNTs. Insert show the diffraction rings.

Fig. 2.27 HR-TEM images of mesoporous silica prepared by the lizard template method (A) before hydrolysis (as-synthesized) (B) after hydrolysis. Reprinted with permission from [106],...

During aging and startup/shutdown, the authors found that poisoning by carbonate-type species was not a major issue. Rather, by HR-TEM and CO chemisorption, the authors concluded that sintering of Pt occurred, with clusters growing from about 1.5 nm to 2.7 nm over the aging period. 

Kim and Thompson—site blocking by formates/carbonates over Au/ceria catalysts linked to deactivation. Kim and Thompson437 reported on the deactivation of Au/ceria catalysts. The ceria was prepared by the decomposition of cerium carbonate (BET SA ceria calcined at 400 °C = 203 m2/g) or obtained from Rhodia (BET SA ceria calcined at 400 °C = 155 m2/g). Au was added by precipitation of HAuC14, resulting in a particle distribution between 1 and 10 nm, with the majority of clusters between 2 and 7 nm, as examined by HR-TEM. The experimental catalyst was tested with respect to the Sud-Chemie water-gas shift catalysts, consisting of Cu-Zn-Al with surface area 60 m2/g, and results are reported in Table 87. 

Some reports showed that pure CNTs can cross cell membrane with high efficiency (Kam et al., 2005 Pantarotto et al., 2004). Some reports showed that CNTs could not be found in cells by HR-TEM (Carrero-Sanchez et al., 2006 Stone and Donaldson, 2006). In our previous studies, we also found that pure CNTs were very difficult to enter into cells such as human fibroblast cells (Tian et al., 2006) and HEK293 cells (Cui et al., 2005), and stem cells, we spent almost 6 months on sectioning these cells and looking for CNTs within cells by HR-TEM, finally we could not find CNTs within cells, we only observed that a lot of CNTs attached to the surface of cells (Fig. 9.10a), and some tubers appeared on the surface of CNTs (Fig. 9.10c). That is to say, non-modified CNTs enter into cells via low-efficient means. However, biomolecules-modified CNTs can efficiently enter into almost all... 

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