نتایج جستجو برای: inter crystalline structure

تعداد نتایج: 1692196  

Journal: :journal of nanostructures 2012
s. asadi h. abdizadeh y. vahidshad

the stabilized zirconia with different cu contents synthesized via sol-gel method. the samples were prepared by hydrolysis and condensation of orgnomatelic sol. after that the result gels were dried at 80 °c and then calcined at various temperatures.  ِ the differential thermal analysis (dta), x-ray diffraction (xrd), field emission scanning electronic microscopy (fesem) and transmission electro...

Journal: :علوم و تکنولوژی پلیمر 0
نعیمه کلته مهدی نکومنش حقیقی پژوهشگاه پلیمر و پتروشیمی ایران حسن عربی

mgcl2/c2h5oh adducts with constant relative ratio of 1/3 were prepared and kept at 120oc for different lengths of times of 5, 10, 20, 30, 50, 90,120 and 220 h. then the samples were quenched and analyzed by xrd and bet. no meaningful changes were observed in the specific surface area of the samples, while xrd spectra showed 3 peaks at 2θ<15o for samples kept at 120oc for 5 h. these 3 peaks were...

Journal: :Dalton transactions 2012
Fei Xu Kazuhiko Matsumoto Rika Hagiwara

A series of 1-alkyl-3-methylimidazolium hexafluorocomplex salts (C(x)MImAF(6), x = 14, 16 and 18, A = P, As, Sb, Nb and Ta) have been characterized by thermal analysis, X-ray diffraction and polarized optical microscopy. A liquid crystalline mesophase is observed for all the C(16)MIm and C(18)MIm salts. The C(14)MIm(+) cation gives a liquid crystalline mesophase only with PF(6)(-). The temperat...

Journal: :Revista Capital Científico - Eletrônica 2015

Journal: :علوم و تکنولوژی پلیمر 0
علی اکبر یوسفی

single-walled carbon nanotubes (swcnt) and multi-walled carbon nanotubes(mwcnt) were melt-blended with polyvinylidene fluoride (pvdf).ft-ir technique revealed that swcnt has insignificant effect on the crystalline structure of pvdf and at 3wt% modification only 14% beta crystal isformed. this observation was accounted for by the chair structure of swcnt. in mwcnt nancomposites it was found that...

Journal: :Journal of Physics: Condensed Matter 2006

Journal: :The Journal of chemical physics 2009
A Diama B Matthies K W Herwig F Y Hansen L Criswell H Mo M Bai H Taub

We present evidence from neutron diffraction measurements and molecular dynamics (MD) simulations of three different monolayer phases of the intermediate-length alkanes tetracosane (n-C(24)H(50) denoted as C24) and dotriacontane (n-C(32)H(66) denoted as C32) adsorbed on a graphite basal-plane surface. Our measurements indicate that the two monolayer films differ principally in the transition te...

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