Gamma-irradiation assisted seeded growth of Ag nanoparticles within PVA matrix

Eisa, Wael H.; Abdel-Moneam, Yasser K.; Shaaban, Yasser; Abdel-Fattah, A.A.; Zeid, Amira M. Abou

doi:10.1016/j.matchemphys.2011.02.076

Cited by 90 publications

(42 citation statements)

References 28 publications

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“…5). As reported in literature this A the initial absorbtion spectrum; B the peak assigned to π → π * transition; C the peak assigned to → π * transition and to the isolated carbonyl group peak is assigned to diffraction from the planes (101) [9,12]. In ours experiments the amplitude of this peak increases after irradiation (Fig.…”

Section: Resultssupporting

confidence: 82%

“…Thus the absorption band at 285 nm may be assigned to π → π * transition of the carbonyl groups (C=O) associated with ethylene unsaturation (C=C) of the type -(CH=CH) 2 CO -. The existence of carbonyl functionalities is probably due to residual acetate groups remaining after hydrolysis of polyvinyl acetate or oxidation during manufacturing [7][8][9]. This absorption peak increases with the content of water of the initial gel.…”

Section: Resultsmentioning

confidence: 99%

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Preliminary spectroscopic investigation of some PVA membranes gamma irradiated

2012

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Abstract:The UV-VIS absorption property and the structural modification of PVA membranes gamma irradiated were investigated by XRD, UV-VIS and Raman spectroscopies. The increase of UV absorbance is observed after irradiation. This behavior is correlated with the scission effect and local ordering of the polymeric chain induced by irradiation. These effects were probed by XRD and Raman spectroscopy.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Preliminary spectroscopic investigation of some PVA membranes gamma irradiated

2012

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“…The average crystallite/grain size is estimated using Debye-Scherrer formula [D=kλ/βcos (θ)] where D is average crystal size, k is the Scherrer coefficient (0.9), λ is the X-ray wavelength (λ=1.54A0), β is the full width half maximum intensity (FWHM) and θ is the diffraction angle [28]. From the Scherrer equation the average crystalline/grain size of Fe3O4-nano particle (NP) is 24 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The strategy of the use of waste materials has an amazing upsurge of good intention in the application of bio-waste materials such as eggshell waste. Low-cost eggshell waste has been widely used as a possible bone substitute, catalyst, support, and efficient bio-templates due to their high catalytic activity, ease of handling, reusability and benign character [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. The eggshell is an inexpensive and easily available biomaterial; it has porous structure that is related to its natural content.…”

Section: Introductionmentioning

confidence: 99%

“…According to the literature, chemical compounds found in egg shell are calcium carbonate (94%), magnesium carbonate (1%), calcium phosphate (1%) and organic matter (4%) [40]. It is individually attractive for synthesizing metal nanoparticles due to strong metal-protein bonding can be readily employed [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Nowadays, waste shell of egg support have been employed as a catalyst for biodiesel synthesis, lactose isomerization and preparation of dimethyl carbonate [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Fe 3 O 4 /Eggshell Nanocomposite and Application for Preparation of Tetrahydrobenzo[b]Pyran Derivatives

Naghizadeh

Mohammadi

Sheibani

et al. 2017

IJEE

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This work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of any stabilizer or surfactant.Fe3O4 magnetic nanoparticles were established on the egg shell nanocomposite. The nanocompositeshave shown high catalytic activities in the synthesis of Tetrahydrobenzo[b]pyran. These derivatives were synthesized via an one-pot three-component condensation of aromatic aldehydes with malononitrile and dimedonewith excellent yields in the presence of Fe3O4/eggshell nanocomposites as a highly efficient heterogeneous catalyst. The obtained catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD) and Vibrating sample magnetometer (VSM). The developed technique of nano-composite synthesis is energy efficient since the reactions carried out in single step. The present catalyst is possible to be used for the production of biodiesel.

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Structural and antibacterial properties of a γ‐radiation‐assisted,in situprepared silver–polycarbonate matrix

Deore

Hareesh

Ramya

et al. 2016

J of Applied Polymer Sci

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A silver–polycarbonate (Ag–PC) matrix was prepared by a γ‐radiation‐assisted diffusion method, and its antibacterial properties were studied. Rutherford backscattering spectroscopy, X‐ray diffraction, and transmission electron microscopy results showed the diffusion of good, crystalline‐structured (face‐centered cubic) silver nanoparticles (AgNPs) inside polycarbonate (PC) after irradiation. Ultraviolet–visible spectroscopic results indicated a blueshift in the surface plasmon resonance of the AgNPs; this revealed a particle size decrease with increasing γ‐radiation dose. This was also supported by the scanning electron microscopy results. The microstructure of the pristine PC and silver‐doped PC was monitored with positron annihilation spectroscopy, and it showed decreases in the free‐volume hole size and fractional free‐volume for Ag–PC and γ‐ray‐irradiated PC. This corroborated the Doppler broadening spectroscopy results. The thermal degradation temperature of PC was increased because of the diffusion of AgNPs in PC. The antibacterial activity of the synthesized Ag–PC matrix was evaluated by the zone of inhibition, and the results demonstrated its bacterial growth inhibition ability. The results indicate the potential to produce an Ag–PC matrix for various applications in medical and food industries. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43729.

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Gamma-irradiation assisted seeded growth of Ag nanoparticles within PVA matrix

Cited by 90 publications

References 28 publications

Preliminary spectroscopic investigation of some PVA membranes gamma irradiated

Preliminary spectroscopic investigation of some PVA membranes gamma irradiated

Synthesis of Fe 3 O 4 /Eggshell Nanocomposite and Application for Preparation of Tetrahydrobenzo[b]Pyran Derivatives

Structural and antibacterial properties of a γ‐radiation‐assisted,in situprepared silver–polycarbonate matrix

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