Monolithic chitosan-silica composite aerogel with comprehensive performances prepared by SBG-FD method

Lian, Wenxian; Zhang, Jie; Liu, Weixin; Liu, Kun; Tang, Shaokun

doi:10.1016/j.ceramint.2023.04.019

Cited by 6 publications

(2 citation statements)

References 57 publications

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“…Also, the resulting peaks around 790 cm −1 , 1077 cm −1 , 1384 cm −1 , and 1400 cm −1 correspond to deformation vibration bands of chitosan-based nanocomposites matched well with previously reported [59,[73][74][75]. Similar results were obtained for the two other chitosan-silica nanocomposites sol-gelderived silica at bands located near ∼449 cm −1 , 790 cm −1 , 946 cm −1 , 1077 cm −1 , referred to the Si-O-and Mg- O-stretching vibration of Si-OH silanol groups within chitosan matrix [64,76,77]. The change in peak intensities detected in the nanoribbon composites succeeding the aminosilane, dispersion as determined by FTIR analysis, is stared as revealing of the optimal chemical parameters for the nanocomposites.…”

Section: Ftir Studysupporting

confidence: 89%

Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites

Abouelnaga,

Abou Hammad

2024

Phys. Scr.

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This investigation involved synthesizing a nanocomposite heterostructure, Chitosan-MgO-SiO2@aminosilane, using the physical blending of chitosan-MgO-silica with aminosilane using the sol–gel technique. The prepared nanocomposites were characterized using x-ray diffraction (XRD), Scanning/Transmission Electron Microscope (SEM-EDX/TEM), Fourier Transform Infrared Spectroscopy (FTIR), and optical analysis to investigate the microstructural and spectroscopic properties. XRD results confirmed the formation of orthorhombic Mg2SiO4 within the fabricated system. FTIR analysis verified interactions among chitosan, MgO-silica, and aminosilane, leading to the development of diverse functional groups, including M-O bonds, silanol-hydroxyl ions, and heteropolymeric-O-M within the chitosan-MgO-SiO2@aminosilane nanocomposite. Optical studies demonstrated that aminosilane-incorporated samples have two distinct absorption bands around 215 nm and 419 nm, corresponding to the electronic transitions π–π* (k-band) and n–π* (R-band), respectively. The absorption band at 400 nm is ascribed to localized surface plasmon resonance (SPR). The incorporation of aminosilane resulted in a decrease in the direct transition energy gap from 2.677 to 2.399 eV. The nanocomposites displayed significant antimicrobial activity against pathogenic microorganisms such as Gram-positive Staphylococcus aureus, Gram-negative Pseudomonas aeruginosa, and pathogenic fungi Candida albicans and Aspergillus niger. The positive antimicrobial response of the fabricated nanocomposites candidates them for various applications, including wound dressings and food packaging.

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Section: Ftir Studysupporting

confidence: 89%

Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites

Abouelnaga,

Abou Hammad

2024

Phys. Scr.

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“…The C 1s binding energy spectrum of CA and SCA14 is shown in Figure c. The peaks at 284.8 and 283.3 eV correspond to the chemical bonding of C in the C–N/C–C and C–O/C–OH bonds, respectively, while the peaks around 286.4 eV are attributed to the residual acetamide groups present in chitosan. In addition, the C–O bond peak strength of SCA14 is lower than that of CA, indicating the hydrogen-bond formation between silica and chitosan .…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Silica–Chitosan Aerogels for Thermal Insulation and Flame Retardancy

Zhuo,

Chen,

Xie

et al. 2024

ACS Appl. Nano Mater.

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The significant accumulation of fly ash has resulted in serious environmental issues. It is imperative to find a safe and high-value method for reusing fly ash to effectively address this problem. Additionally, silica aerogels have gained attention as a promising material for energy conservation and thermal management. However, producing a silica aerogel with low production costs and superior overall properties is still a major challenge. In this study, silica−chitosan composite aerogels (SCA) were prepared from fly ash and chitosan. Amorphous silica is polymerized in situ on chitosan by hydrogen bonding and silyloxygen condensation. The resulting aerogels exhibited a fully formed block structure, extremely low density, exceptional flame retardancy, and notable mechanical properties (able to withstand 24,000 times the stress of its own mass). It is noteworthy that the nanopores and three-dimensional network structure endow SCA with excellent thermal insulation performance (with a thermal conductivity of 0.0474−0.0521 W m −1 K −1 ). The strategy presented here provides a cost-effective and straightforward approach to prepare SCA. The results demonstrate its considerable potential for practical use in energy-efficient and thermally insulated structures. Moreover, this approach offers a direct and high value-added solution to the problem of fly ash.

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Silica nanowires-reinforced silica aerogels with outstanding thermal insulation, thermal stability and mechanical properties

Wang,

Lian,

Yin

et al. 2024

Ceramics International

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Monolithic chitosan-silica composite aerogel with comprehensive performances prepared by SBG-FD method

Cited by 6 publications

References 57 publications

Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites

Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites

Nanoporous Silica–Chitosan Aerogels for Thermal Insulation and Flame Retardancy

Silica nanowires-reinforced silica aerogels with outstanding thermal insulation, thermal stability and mechanical properties

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Monolithic chitosan-silica composite aerogel with comprehensive performances prepared by SBG-FD method

Cited by 6 publications

References 57 publications

Optical properties and antimicrobial of ionic chitosan-MgO-SiO2@ aminolsilane nanocomposites

Optical properties and antimicrobial of ionic chitosan-MgO-SiO2@ aminolsilane nanocomposites

Nanoporous Silica–Chitosan Aerogels for Thermal Insulation and Flame Retardancy

Silica nanowires-reinforced silica aerogels with outstanding thermal insulation, thermal stability and mechanical properties

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Product

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Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites

Optical properties and antimicrobial of ionic chitosan-MgO-SiO₂@ aminolsilane nanocomposites