Study of the hydrolysis and condensation of γ-Aminopropyltriethoxysilane by FT-IR spectroscopy

Natural halloysite nanotubes as mesoporous carriers for the loading of ibuprofen

“…6c and d) is confirmed by the presence of additional peaks such as the -CH 2 asymmetric stretching vibration band at 2933 cm À1 and the -NH 2 deformation vibration band at 1473 cm À1 . Furthermore, the -CH 3 deformation vibration band at 1390 cm À1 is present in both Hal/120-A and Hal/400-A, suggesting that incomplete hydrolysis of APTES occurred in both samples [67]. Because the inner AlOH groups are unavailable for grafting APTES and loading IBU, their vibration (3621 cm À1 ) can be used as a reference to evaluate the 29 Si MAS NMR spectra, and (b) 13 C MAS NMR spectra (dotted lines for experimental and solid lines for simulated).…”

Calotropis Procera plant extract as green corrosion inhibitor for 304 stainless steel in hydrochloric acid solution

“…Those observations are consistent with the previous assumptions. Moreover, the peaks that originated from -CH 3 asymmetric stretching (2957 cm ), vibrations are the highest for the coatings deposited from aqueous solutions [32]. Bands at 1267cm -1 and 1053 cm -1 are assigned to the -CN (symmetric bending) and -CO (asymmetric stretching) vibrations, respectively [33].…”

Revestimentos de alta camada obtidos com a modificação de resinas epóxi novolaca pela reação com organo-siloxano e catálise ácida

“…Além disso, os produtos obtidos foram caracterizados por absorção de radiação no infravermelho (FTIR), com o emprego do 21 espectrofotômetro Varian 660-IR equipado com sistema de reflexão ATR (Attenuated Total Reflection). Os espectros foram obtidos na faixa de 4000-4520 cm -1 , com resolução de 4 cm -1 e um total de 16 varreduras acumuladas nas aquisições de cada espectro.…”