Arturo Ponce; Darío Bueno's Advanced electron microscopy and nanomaterials : selected, PDF

By Arturo Ponce; Darío Bueno

ISBN-10: 3038133361

ISBN-13: 9783038133360

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Read Online or Download Advanced electron microscopy and nanomaterials : selected, peer reviewed papers from the First Joint Advanced Electron Microscopy School for Nanomaterials and the Workshop on Nanomaterials (AEM-NANOMAT '09), Saltillo (Coahuila) México, September 29th-Oct PDF

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From the linear fit of ln (τ/τo) vs TB ln (τ/τo) (Fig. 96x103 J/m3 is close to that of bulk magnetite (104 – 105 J/m3) [5]. The magnetic nanocomposite and pure polyurethane foams consist of open cells and spherical pores as shown in Fig. 4. Incorporation of magnetic particles provoked a decrease of about 38 % in pore size probably due to the oleic acid on the particle surfaces acting as a surfactant and thus decreasing superficial tension and/or the particles acting as a nucleation agent, provoking an increase in bubble Arturo Ponce and Darío Bueno 31 generation, and, therefore, a decrease in pore size.

7(4) nm. The morphology of the as-spun membranes was investigated by SEM. The sample of PVDF alone showed straight fibers together with a certain number of beads, or small regions where the fiber gets thicker, as shown in Fig. 1(a). In contrast, all nanocomposites were conformed of thin fibers and a large amount of beads, as shown in Fig. 1(b) to (d). These results reflect the fact that the nanoparticles induced a drastic change in the morphology of the membranes, favoring the formation of beads.

41, respectively. In contrast, when TIPAC was used as additive, the fraction of beta phase raised to 1, which indicates that the amount of alfa phase was completely suppressed. The mechanism responsible for such change in the crystalline phases is not well understood, but could be attributable to the ionic interactions of the polymer with the additive and the subsequent inhibition of the crystal growth. ) TIPAC b) m-silane a-silane 800 1000 1200 1400 Wavenumber (1/cm) Fig. 4. % TIPAC The addition of TIPAC also induced a drastic change in the morphology of the sample, as shown in Fig.

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Advanced electron microscopy and nanomaterials : selected, peer reviewed papers from the First Joint Advanced Electron Microscopy School for Nanomaterials and the Workshop on Nanomaterials (AEM-NANOMAT '09), Saltillo (Coahuila) México, September 29th-Oct by Arturo Ponce; Darío Bueno


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