Preparation and properties of hybrid monodispersed magnetic α-Fe2O3 based chitosan nanocomposite film for industrial and biomedical applications

Singh, Jay; Srivastava, Manish; Dutta, Joydeep; Dutta, Pradip Kumar

doi:10.1016/j.ijbiomac.2010.10.016

Cited by 77 publications

(26 citation statements)

References 56 publications

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“…3. Chitosan exhibits three reflection falls at 2Â = 11 • , 20 • and 23 • with 270 and 567 intensity counts [38]. The former two peaks correspond to the hydrated crystalline structure, while the broaden peak observed at 2Â = 23 • indicates the existence of an amorphous structures [39].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…In TGA graph of nanocomposite film (Fig. 5c) the weight loss of 5% in the temperature range 54-140 • C is due to the residual water in the sample [38], the weight loss of 8% in the temperature range 158-246 • C is due to the degradation of chitosan chain and weight loss of 24% in the temperature range 256-395 • C is due to the lower grafting of acid in polymer [28].…”

Section: Thermal Analysismentioning

confidence: 99%

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4-(Ethoxycarbonyl) phenyl-1-amino-oxobutanoic acid–chitosan complex as a new matrix for silver nanocomposite film: Preparation, characterization and antibacterial activity

Srivastava

Tiwari

Dutta

2011

International Journal of Biological Macromolecules

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Section: Thermal Analysismentioning

confidence: 99%

4-(Ethoxycarbonyl) phenyl-1-amino-oxobutanoic acid–chitosan complex as a new matrix for silver nanocomposite film: Preparation, characterization and antibacterial activity

Srivastava

Tiwari

Dutta

2011

International Journal of Biological Macromolecules

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“…The diversity in chemical structure and physical properties of the iron oxide phases provide many different applications at the research and industrial levels (see Figure 1). Iron oxides have been investigated for their potential use in a wide range of important applications, such as catalysis, electrochemistry, magnetization, biomedical science, as pigments in ceramic glazes, and in environmental applications [3][4][5][6][7][8]. Hematite, maghemite, and magnetite, for example, are used as catalysts in the Fischer-Tropsch synthesis of hydrocarbons and ammonia [9][10][11][12][13][14], and in the synthesis of styrene through the dehydrogenation of ethylbenzene [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Density Functional Theory Study of the Adsorption of Benzene on Hematite (α-Fe2O3) Surfaces

2014

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Abstract:The reactivity of mineral surfaces in the fundamental processes of adsorption, dissolution or growth, and electron transfer is directly tied to their atomic structure. However, unraveling the relationship between the atomic surface structure and other physical and chemical properties of complex metal oxides is challenging due to the mixed ionic and covalent bonding that can occur in these minerals. Nonetheless, with the rapid increase in computer processing speed and memory, computer simulations using different theoretical techniques can now probe the nature of matter at both the atomic and sub-atomic levels and are rapidly becoming an effective and quantitatively accurate method for successfully predicting structures, properties and processes occurring at mineral surfaces. In this study, we have used Density Functional Theory calculations to study the adsorption of benzene on hematite (α-Fe 2 O 3 ) surfaces. The strong electron correlation effects of the Fe 3d-electrons in α-Fe 2 O 3 were described by a Hubbard-type on-site Coulomb repulsion (the DFT+U approach), which was found to provide an accurate description of the electronic and magnetic properties of hematite. For the adsorption of benzene on the hematite surfaces, we show that the adsorption geometries parallel to the surface are energetically more stable than the vertical ones. The benzene molecule interacts with the hematite surfaces through π-bonding in the parallel adsorption geometries and through weak hydrogen bonds in the vertical geometries. Van der Waals interactions are found to play a significant role in stabilizing the absorbed benzene molecule. Analyses of the electronic structures reveal that upon benzene adsorption, the conduction band edge of the surface atoms is shifted towards the valence bands, thereby considerably reducing the band gap and the magnetic moments of the surface Fe atoms. OPEN ACCESSMinerals 2014, 4 90

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“…It is used as a pigment, catalyst, sensor, electrode material, biomedical and magnetic material [1,2,[21][22][23]. Hematite crystallizes in the rhombohedral system space group R3c (corundum structure) with n-type semiconducting properties (2.1 eV band gap) [1,2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles

Tadić

Čitaković

Panjan

et al. 2011

Journal of Alloys and Compounds

115

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Preparation and properties of hybrid monodispersed magnetic α-Fe2O3 based chitosan nanocomposite film for industrial and biomedical applications

Cited by 77 publications

References 56 publications

4-(Ethoxycarbonyl) phenyl-1-amino-oxobutanoic acid–chitosan complex as a new matrix for silver nanocomposite film: Preparation, characterization and antibacterial activity

4-(Ethoxycarbonyl) phenyl-1-amino-oxobutanoic acid–chitosan complex as a new matrix for silver nanocomposite film: Preparation, characterization and antibacterial activity

A Density Functional Theory Study of the Adsorption of Benzene on Hematite (α-Fe2O3) Surfaces

Synthesis, morphology, microstructure and magnetic properties of hematite submicron particles

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