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

Almeida, J. Carlos; Wacha, András; Bóta, Attila; Almásy, László; Fernandes, María Helena; Margaça, F.M.A.; Salvado, Isabel M. Miranda

doi:10.1016/j.polymer.2015.06.053

Cited by 11 publications

(22 citation statements)

References 67 publications

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“…4.8 ppm is assigned to physisorbed water molecules [41,43], probably related to the inclusion of Ca into the composition of the hybrids. No physisorbed water was detected in our previous studies [12] were the structure of PDMS-SiO 2 hybrids without Ca was also analysed by 1 H MAS-NMR.…”

Section: H} Nmr Cp-mas Analysismentioning

confidence: 85%

“…Besides its importance as an inducing agent for the precipitation of surface calcium phosphates, titanium can have an effect on the condensation of the siloxane units leading to the formation of longer PDMS chains together with oxide based particles [11] and also influencing the final morphology of PDMSSiO 2 -TiO 2 xerogels [12].…”

Section: +mentioning

confidence: 99%

“…For this, two PDMS-SiO 2 -TiO 2 -CaO porous hybrid materials were prepared with the same amounts of precursors and solvents, but using two different approaches for the sol-gel procedure based on the authors' previous works [12,16,17]. The …”

Section: +mentioning

confidence: 99%

“…In procedure I, already discussed in previous works [12,19], an aqueous solution of Ca(CH 3 CO 2 ) 2 .H 2 O (the amount of water used was only the required to dissolve the acetate) was added to a mixture of TEOS, PDMS and the remaining H 2 O. Afterwards, isopropanol was added and the medium was acidified with HCl.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Si-{ 1 H} CP-MAS (cross-polarization magical angle spinning) NMR, using the experimental conditions described in a previous work [12]. The CP-MAS spectra were simulated using DMFIT [20] and data available from the literature [21][22][23][24] is the scattering angle and λ is the wavelength).…”

Section: Ft-ir and Solid-state Nmr Spectroscopymentioning

confidence: 99%

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PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Almeida

Wacha

Gomes

et al. 2016

Materials Science and Engineering: C

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Two biocompatible PDMS-SiO 2 -TiO 2 -CaO porous hybrid materials were prepared using the same base composition, precursors, and solvents, but following two different sol-gel procedures, based on the authors' previous works where for the first time, in this hybrid system, calcium acetate was used as calcium source. The two different procedures resulted in monolithic materials with different structures, microstructures, and surface wettability. Even though both are highly hydrophobic (contact angles of 127.2° and 150.6°), and present different filling regimes due to different surface topographies, they have demonstrated to be biocompatible when tested with human osteoblastic cells, against the accepted idea that high-hydrophobic surfaces are not suitable to cell adhesion and proliferation. At the nanoscale, the existence of hydrophilic silica domains containing calcium, where water molecules are physisorbed, is assumed to support this capability, as discussed.

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Section: H} Nmr Cp-mas Analysismentioning

confidence: 85%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%