Synthesis and structural characterization of sol–gel derived titania/poly (vinyl pyrrolidone) nanocomposites

Hybrid biodegradable membranes of silane-treated chitosan/soy protein for biomedical applications

“…There is a growing interest in the use of sol–gel method for the creation of nanocomposites, biosensors and optical devices. 1 –3 The sol–gel process has been used in the production of hybrid organic–inorganic materials, and represents a promising class of engineered materials, which includes functional and structural components constructed by the integration of biopolymers with inorganic components in a variety of forms. 4 –7 Silane coupling agents such as 3-isocyanatopropyltriethoxysilane (ICPTES), 3-glycidyloxypropyltrimethoxysilane (GPTMS), 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) 3,4,8,9 have been used to form the inorganic component of the hybrid materials, while natural polymers and their blends have been considered good candidates to form the organic phase due to their intrinsic properties and characteristics.…”

Stability and Influence of Storage Conditions on Nanofibrous Film Containing Tooth Whitening Agent

“…Only the stretching vibration of N–H at 1635 cm −1 was found. These results suggested that high temperature could lead to a decrease in the water content and hydroxyl groups [ 54 ]. Therefore, many peaks were missing due to damage from heat.…”

Polyethersulfone membrane embedded with amine functionalized microcrystalline cellulose

“…According to the literature, the following peaks are observed in the FTIR spectrum of PVP: 572 cm −1 is ascribed to δ(N-C=O) [17], 735-657 cm −1 is assigned to amide or CH 2 rocking band [18], 839 cm −1 is attributed to the vibrations occurred due to C\ \C ring bending [19], the vibrational peak observed at 894 cm −1 belongs to CH 2 rocking [20], 933 cm −1 corresponds to the C\ \C bonding [21] or out-of-plane rings C\ \H bending [22], 1017 cm −1 depicts the CH 2 rocking of PVP [23], 1072 cm −1 may be due to the C\ \N bond stretching mode [24], 1229 cm −1 is originated from the CH 2 twisting [25], 1288 cm −1 is owned to C\ \N stretching or CH 2 twisting or wagging [26], 1321 cm −1 is proportioned to CH 2 wagging [27], the absorption peak at ~1371 cm −1 is related to the C\ \H bond in PVP [28], ~1421 cm −1 and ~1458 cm −1 are ascribed to the -CH 2 absorption [28] or C 4 N-of PVP bond absorption [29], a small absorption band at about 1496 cm −1 is assigned to the characteristic vibration of C_N (pyridine ring) [30], the band at 1663 cm −1 is attributed to the amide group of PVP [31], the vibrational peak observed at 2135 cm −1 belongs to CN stretching vibration [20], 2919 cm −1 corresponds to symmetric CH 2 stretching [32], 2955 cm −1 depict C\ \H bond vibrations [29] or asymmetric of ѵ(CH 2 ) pyrrole ring [17], and 3454 cm −1 is due to O\ \H bond vibrations [29].…”