FTIR spectroscopy studies on the spontaneous neutralization of chitosan acetate films by moisture conditioning

Mauricio-Sánchez, Reina Araceli; Salazar, Ricardo; Luna-Bárcenas, J. Gabriel; Mendoza-Galván, A.

doi:10.1016/j.vibspec.2017.10.005

Cited by 160 publications

(69 citation statements)

References 28 publications

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“…The bands at 895 and 1,559 cm -1 corresponded to N-H wagging and -NH 2 bending vibration modes, respectively. 39,40 The C-O and bridge oxygen stretching vibration bands were detected at 1,069 and 1,155 cm -1 , respectively. 39 The Gd-BG scaffolds also showed characteristic absorption peaks of CH n groups, including the CH 2 deformation vibration band at 1,418 cm -1 , -CH 3 symmetric deformation vibration band at 1,384 cm -1 , and CH 2 wagging vibration band at 1,335 cm -1 .…”

Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 98%

“…39,40 The C-O and bridge oxygen stretching vibration bands were detected at 1,069 and 1,155 cm -1 , respectively. 39 The Gd-BG scaffolds also showed characteristic absorption peaks of CH n groups, including the CH 2 deformation vibration band at 1,418 cm -1 , -CH 3 symmetric deformation vibration band at 1,384 cm -1 , and CH 2 wagging vibration band at 1,335 cm -1 . 36 The band at 1,652 cm -1 was ascribed to amide I group, and the bands at 1,559 and 1,418 cm -1 were ascribed to carboxylate ions.…”

Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 98%

“…36 The band at 1,652 cm -1 was ascribed to amide I group, and the bands at 1,559 and 1,418 cm -1 were ascribed to carboxylate ions. 39 The sharp band at 668 cm -1 was attributed to the OCO(δ) vibration of residuary CH 3 COOH. 41 The SEM images of Gd-BG scaffolds showed 3D macropores, with pore sizes of ~150 µm (Figure 2A).…”

Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 99%

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<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>

Zhu¹,

Lü²,

Yin³

et al. 2019

IJN

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BackgroundBiomaterial-induced osteogenesis is mainly related to hierarchically porous structures and bioactive components. Rare earth elements are well known to promote osteogenesis and stimulate bone repair; however, the underlying biological effects of gadolinium (Gd) element on bone regeneration are not yet known.MethodsIn this study, we successfully fabricated gadolinium-doped bioglass (Gd-BG) scaffolds by combining hollow mesoporous Gd-BG microspheres with chitosan and evaluated in vitro effects and underlying mechanisms with Cell Counting Kit-8, scanning electron microscopy, alkaline phosphatase, Alizarin red staining, and polymerase chain reaction. Cranial defect model of rats was constructed to evaluate their in vivo effects.ResultsThe results indicated that Gd-BG scaffolds could promote the proliferation and osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (hBMSCs). Mechanistically, the Akt/GSK3β signaling pathway was activated by the Gd-BG scaffolds. The enhancing effect of Gd-BG scaffolds on the osteogenic differentiation of hBMSCs was inhibited by the addition of LY294002, an inhibitor of Akt. Moreover, the in vivo cranial defect model of rats indicated that the Gd-BG scaffolds could effectively promote bone regeneration.ConclusionBoth in vitro and in vivo results suggested that Gd-BG scaffolds have promising applications in bone tissue engineering.

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Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 98%

Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 98%

Section: Morphology and Structure Of Gd-bg Scaffoldsmentioning

confidence: 99%

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<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>

Zhu¹,

Lü²,

Yin³

et al. 2019

IJN

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“…The presence of the characteristic peak at 1648 cm −1 is related to vibration of water absorbed and primary amide. The peaks in the range 1260-800 cm −1 belong to the absorption of glycosidic ring, 27 and the peak at 1258 cm −1 is regarded as the absorption of C-O of the glycosidic ring and the red shift of this absorption peak is observed from the CTS-PFCS sample, which may result from the formation of a large conjugated system. As for the FTIR spectra of PFCS and CTS-PFCS samples, the two peaks at 1060 and 958 cm −1 are masked by the broad Si-O-Si band and stretching vibration of Fe-O-Si.…”

Section: Calculation Of the Decolorization Percentagementioning

confidence: 99%

Synthesis and evaluation of a novel inorganic–organic composite flocculant, consisting of chitosan and poly‐ferric cerium silicate

Liu

Zhu

Yang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Coagulation/flocculation is widely used in the treatment of dye wastewater because of the low cost, high efficiency, short process and convenient operation. However, with the increase of pollutants in water and in recent years the higher requirement for environment protection, traditional flocculants have found it difficult to meet the processing requirements. Therefore, to develop new, efficient, stable and environment‐friendly flocculants is very necessary and urgent. RESULTS Decoloration performance and mechanism, stability and structure of flocculants were determined from experimental data, and the results indicated that chitosan and poly‐ferric cerium silicate (CTS‐PFCS) flocculant, a three‐dimensional chain‐net structure with bar‐like branches, was a complex compound rather than a simple mixture of raw materials. The decoloration performance and stability of this flocculant was superior to that of poly‐ferric cerium silicate (PFCS) when treating Direct Red dye wastewater, and also it had a wide range of pH application. The main mechanism for flocculation is charge‐neutralization and chemical adsorption in the initial stage of flocculation and later bridge‐aggregation. CONCLUSION A novel inorganic–organic composite flocculant CTS‐PFCS was successfully synthesized by the combination of chitosan and homemade PFCS. The potential use of chitosan as an organic additive for modifying inorganic polymers flocculant in the clarification of wastewater was demonstrated. © 2018 Society of Chemical Industry

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“…In infrared spectroscopy, IR radiation is incident on a sample; then some of the infrared radiation passes through (transmitted) and some of it is absorbed by the sample. The resulting spectrum represents the transmission and absorption of a sample [46][47][48].…”

Section: Spectral Measurement and Analysismentioning

confidence: 99%

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Family¹,

Mengüç²

2018

Sustainability

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The main goal of this paper is to explore the radiative cooling and solar heating potential of several materials for the built environment, based on their spectrally-selective properties. A material for solar heating, should have high spectral emissivity/absorptivity in the solar radiation band (within the wavelength range of 0.2–2 μm), and low emissivity/absorptivity at longer wavelengths. Radiative cooling applications require high spectral emissivity/absorptivity, within the atmospheric window band (8–13 μm), and a low emissivity/absorptivity in other bands. UV-Vis spectrophotometer and FTIR spectroscopy, are used to measure, the spectral absorption/emission spectra of six different types of materials. To evaluate the radiative cooling potential of the samples, the power of cooling is calculated. Heat transfer through most materials is not just a surface phenomenon, but it also needs a volumetric analysis. Therefore, a coupled radiation and conduction heat transfer analysis is used. Results are discussed for the selection of the best materials, for different applications on building surfaces.

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FTIR spectroscopy studies on the spontaneous neutralization of chitosan acetate films by moisture conditioning

Cited by 160 publications

References 28 publications

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>

Synthesis and evaluation of a novel inorganic–organic composite flocculant, consisting of chitosan and poly‐ferric cerium silicate

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

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FTIR spectroscopy studies on the spontaneous neutralization of chitosan acetate films by moisture conditioning

Cited by 160 publications

References 28 publications

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3&beta; pathway and facilitate bone repair in vivo</p>

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3&beta; pathway and facilitate bone repair in vivo</p>

Synthesis and evaluation of a novel inorganic–organic composite flocculant, consisting of chitosan and poly‐ferric cerium silicate

Analysis of Sustainable Materials for Radiative Cooling Potential of Building Surfaces

Contact Info

Product

Resources

About

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>

<p>Gadolinium-doped bioglass scaffolds promote osteogenic differentiation of hBMSC via the Akt/GSK3β pathway and facilitate bone repair in vivo</p>