Untitled

Lana, Sebastiana Luiza Bragança; Seddon, Angela B.

doi:10.1023/a:1008685614559

Cited by 43 publications

(12 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1-3). One can perceive from the XRD the amorphous structure of all hybrids containing PEO and HEMA, which is in good agreement with the studies of Lana and Seddon [53]. For the sample with chitin, X-ray patterns feature main peaks at 9.8°and 20°a ssociated with the chitin structure [33].…”

Section: Resultssupporting

confidence: 88%

Sol–gel synthesis and structure of silica hybrid biomaterials

Samuneva

Djambaski

Kashchieva

et al. 2008

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 88%

Sol–gel synthesis and structure of silica hybrid biomaterials

Samuneva

Djambaski

Kashchieva

et al. 2008

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…A second broad peak around a 2q value of 21 , and also observed in the XRD spectra of all xerogels samples, is related with short range order of amorphous silica (SieOeSi), corresponding to a Bragg d-spacing of 4 Å [72]. Table 5 Values of power exponent d, radius of gyration R g , surface fractal dimension D S and intensity pre-factor A, determined from the SAXS and SANS plots for the different compositions, and values of surface area calculated from the nitrogen adsorption isotherms of group I samples.…”

Section: Small Angle Scattering and Xrdmentioning

confidence: 61%

PDMS-SiO2 hybrid materials – A new insight into the role of Ti and Zr as additives

Almeida

Wacha

Bóta

et al. 2015

Polymer

View full text Add to dashboard Cite

“…Usually, materials with higher content of chemical groups or organic molecules use to present higher formation of less stressed sixmembered ring, thereby allowing a better accommodation of the nonreactive organic groups [37]. Furthermore, there is a correlation between the formation of six-membered rings and an increase in the relative degree of crystallinity, as well as with the long-range organization in hybrid silica materials that is normally observed with an increase in the degree of matrix alkylation [38]. 4 above and six-membered siloxane ring (SiO) 6 below.…”

Section: Molecules Within Bulk Silicamentioning

confidence: 99%

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Capeletti¹,

Zimnoch²

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

View full text Add to dashboard Cite

Fourier Transform Infrared and Raman are powerful techniques to evaluate silica and hybrid silica structure. It is possible to evaluate the silica network formation along the hydrolysis and condensation reactions in terms of siloxane rings formation and Si-O(-Si) angle deformation due to the introduction of organic groups, the employed synthetic route or encapsulated species interaction. The siloxane four-or six-membered rings imply in a more rigid or flexible network, respectively, in order to accommodate the organic groups. A structural analysis of the materials is of high importance, since interactions between the encapsulated molecules and the matrix are critical for the device performance, such as sensors. This type of device needs the permeation of an analyte to activate the encapsulated receptor molecules inside the silica structure. Fourier transform infrared spectrometry can be also used to determine parameters of the silica network as a function of the hydrophilicity/hydrophobicity degree and the siloxane ring structure with respect to thin film porosity. This silica structural analysis is reviewed along the text in a tentative of better exploring the data resulting from these powerful techniques. In addition, the functionalization of silica structures by the use of organoalkoxysilanes, which is important to the creation of high-specific materials, can be well described by these two complementary techniques. The Si-C bonds and the maintenance of the organic substituents such as methyl, octyl, octadecyl, vinyl, phenyl, aminopropyl, mercaptopropyl, isocyanatopropyl, iodopropyl, chloropropyl and glicydoxypropyl could be evaluated after the sol-gel synthesis process. The literature regarding silica vibrational spectroscopy is also explored creating a data bank of wave numbers for the most important bonds for different types of silica and hybrid silica materials obtained by different synthetic routes.

show abstract

Untitled

Cited by 43 publications

References 1 publication

Sol–gel synthesis and structure of silica hybrid biomaterials

Sol–gel synthesis and structure of silica hybrid biomaterials

PDMS-SiO2 hybrid materials – A new insight into the role of Ti and Zr as additives

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Contact Info

Product

Resources

About