Effect of initial γ-irradiation on infrared laser ablation of poly(vinyl alcohol) studied by infrared spectroscopy

Electrospun Fibrous Silica for Bone Tissue Engineering Applications

“…To investigate the composition of ES-obtained sample characteristic absorption bands and the interactions between com were recorded for non-aged and 1.5 h aged materials (Figure 2), bo and SiO2/PVA_1.5h aging) and after 500 °C treatment (SiO2_0h agin The infrared spectrum of non-aged and non-calcined sample the preponderant presence of silica-originating vibrations, such stretching (~1060 cm −1 ), overlapped Si-O-C stretching and symm (~800 cm −1 ), Si-OH bending (~950 cm −1 ), and Si-O stretching (~44 Si-containing bonds, the intense absorbance maxima from ~1060 c vibrations of C-C-O from the ethoxy of TEOS and ethanol (a hyd the subtle shoulder between 1100-1200 cm −1 may be assigned to t PVA [68,69]. Additionally, the presence of carbon-containing bond is noticed at ~2900 cm −1 and ~1700 cm −1 [69,70].…”

“…These results confirm the formation of pure, inorganic silica-b The infrared spectrum of non-aged and non-calcined samples (Figure 2, pink) shows the preponderant presence of silica-originating vibrations, such as asymmetric Si-O-Si stretching (~1060 cm −1 ), overlapped Si-O-C stretching and symmetric Si-O-Si stretching (~800 cm −1 ), Si-OH bending (~950 cm −1 ), and Si-O stretching (~440 cm −1 ) [66,67]. Besides Si-containing bonds, the intense absorbance maxima from ~1060 cm −1 may superpose the vibrations of C-C-O from the ethoxy of TEOS and ethanol (a hydrolysis product), while the subtle shoulder between 1100-1200 cm −1 may be assigned to the C-O stretching from PVA [68,69]. Additionally, the presence of carbon-containing bonds originating from PVA is noticed at ~2900 cm −1 and ~1700 cm −1 [69,70].…”

Surface Functionalities of Polymers for Biomaterial Applications

“…Depending on the chemical composition and physical state of the polymer, a dose of preliminary γ-irradiation can decrease the rate of LA of PVF [113], or it can increase the rate of LA of PE, an ethylene-propylene copolymer [114]; polyamide; and PTFE [115]. It was reported that an increase in the time of laser irradiation leads to an acceleration of the rate of LA for the ablation of polyethylene (PE) [114], poly(vinylidene fluoride) (PVDF), polyamide, and polytetrafluoroethylene (PTFE) [115][116][117][118].…”

“…This was confirmed by IR spectrum of the γ-irradiated PVA [119] with the spectrum of the crater formed during its laser ablation showing that all of the bands in the spectrum of the radiolized PVA are also present in the spectrum of its crater formed after LA. Their presence in the spectrum of the ablation crater is associated with both their stability under the action of a laser and the probability of replacing such preradiolysis products with a new portion of them from the PVA that has undergone radiolysis [116].…”