Surfactant effects on the particle size of iron (III) oxides formed by sol–gel synthesis

Camponeschi, Erin; Walker, Jeremy; Garmestani, Hamid; Tannenbaum, Rina

doi:10.1016/j.jnoncrysol.2008.04.018

Cited by 12 publications

(6 citation statements)

References 33 publications

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“…A few processes that are currently being investigated and refined to produce high-quality nanomaterials are chemical vapour deposition to produce carbon nanotubes and carbon nanostructures [6, 7], ultrasound techniques to produce nanohydroxyapatite crystals for biomedical applications [8, 9] and the wet sol-gel synthesis method for creating iron oxide (Fe 2 O 3 ) nanoparticles [10, 11]. The most attractive feature of using nanotechnology-based processing techniques is that it gives the manufacturer far greater control over the polydiversity, phase, crystalline structure, topography, morphology, and quality of the nanomaterials produced.…”

Section: Introductionmentioning

confidence: 99%

Engineering a Biocompatible Scaffold with Either Micrometre or Nanometre Scale Surface Topography for Promoting Protein Adsorption and Cellular Response

Poinern

Ali

et al. 2013

International Journal of Biomaterials

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Surface topographical features on biomaterials, both at the submicrometre and nanometre scales, are known to influence the physicochemical interactions between biological processes involving proteins and cells. The nanometre-structured surface features tend to resemble the extracellular matrix, the natural environment in which cells live, communicate, and work together. It is believed that by engineering a well-defined nanometre scale surface topography, it should be possible to induce appropriate surface signals that can be used to manipulate cell function in a similar manner to the extracellular matrix. Therefore, there is a need to investigate, understand, and ultimately have the ability to produce tailor-made nanometre scale surface topographies with suitable surface chemistry to promote favourable biological interactions similar to those of the extracellular matrix. Recent advances in nanoscience and nanotechnology have produced many new nanomaterials and numerous manufacturing techniques that have the potential to significantly improve several fields such as biological sensing, cell culture technology, surgical implants, and medical devices. For these fields to progress, there is a definite need to develop a detailed understanding of the interaction between biological systems and fabricated surface structures at both the micrometre and nanometre scales.

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Section: Introductionmentioning

confidence: 99%

Engineering a Biocompatible Scaffold with Either Micrometre or Nanometre Scale Surface Topography for Promoting Protein Adsorption and Cellular Response

Poinern

Ali

et al. 2013

International Journal of Biomaterials

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“…The surfactant interfered in the growth stage of the iron oxide nanoparticles (gel phase) and prevented the formation of a gel. This occurred because the NaDDBS molecules had already coordinated to the iron (III) centers due to the attraction between the negatively-charged hydrophilic head of the surfactant and the positively-charged iron (Matarredona et al, 2003;Camponeschi et al, 2008). Therefore, due to the presence of the NaDDBS molecules, no aggregates of γ-Fe 2 O 3 were formed but rather the nanoparticles remained individually isolated and dispersed along the length of the CNTs.…”

Section: Wwwintechopencommentioning

confidence: 99%

Magnetic Carbon Nanotubes: Synthesis, Characterization, and Anisotropic Electrical Properties

Kim¹,

Tannenbaum²

2011

Electronic Properties of Carbon Nanotubes

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Electronic Properties of Carbon Nanotubes 34The alignment of CNTs in a variety of matrices can be used to reinforce, intensify, and enhance some of the properties of the resulting systems, as well as introduce various degrees of anisotropy into the properties of the desired nanomaterials (Kimura et al., 2002;Garmestani et al., 2003). The alignment of CNTs in a suspension under a magnetic field requires that the energy produced by the torque acting on a magnetically-anisotropic segment exceeds the thermal energy of that particular segment, such that:, where B is the field strength, n is the number of carbon atoms in the segment, and  is the magnetic anisotropy (Fisher et al., 2003). However, due to the low magnetic susceptibility of CNTs, their alignment by the application of an external magnetic field requires a relatively high magnetic field (Camponeschi et al., 2007). This drawback could be eliminated by enhancing the magnetic susceptibility of carbon nanotubes via the tethering of magnetic nanoparticles onto their surface. In zero field, the magnetic moments of the maghemite nanoparticles randomly point in different directions, resulting in a vanishing net magnetization. However, if a sufficient homogeneous magnetic field is applied, the magnetic moments of the nanoparticles align in parallel, and the resulting dipolar interactions are sufficiently large to overcome thermal motion and to reorient the magnetic CNTs.In this chapter, we describe and report a convenient approach for the decoration of CNTs with near-monodisperse maghemite nanoparticles by employing a novel and simple modified sol-gel process (in-situ process) with a n i r o n s a l t a s p r e c u r s o r , f o l l o w e d b y calcination. The resulting hybrid nanomaterials are superparamagnetic at room temperature and are conducive to facile alignment under relatively low magnetic fields. Subsquently, the nanohybrid materials, i.e. the magnetized carbon nanotubes, were incorporated into a polymer matrix and aligned by the application of a magnetic field, forming polymer composites with an aligned filler phase. It is therefore expected that the composites formed in this manner would exhibit anisotropic mechanical and electrical properties that would depend on and correlate with the parallel and perpendicular direction to the magnetic field that has been applied and under which the alignment has taken place. Experimental details 2.1 Synthesis of maghemite-MWCNT nanohybrid materialsPure-MWCNTs were first dispersed in a solution mixture of concentrated H 2 SO 4 and HNO 3 with the volume ratio of 3:1. The suspension was ultra-sonicated for 3 hrs at room temperature. After that, the concentration of the suspension was diluted up to 50% and filtered with a PTFE membrane (0.45 μm pore size) with the aid of a vacuum pump. Carboxylated MWCNT (MWCNT-COOH) was washed with de-ionized water several times to reach neutral pH and dried under vacuum at 50 °C overnight. The synthesis of maghemite-MWCNT was performed by first adding 0.65 g Fe(NO 3 ) 3 ·9H 2 O to ...

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“…(N, N`-bis(β-Salicylalimino ethyl)-2,6-pyridine di carboxylic acid) was derived from salicylaldehyde and acetyl acetone with Di aliphatic and aromatic amines (5) .Complexes of transition metal (Cu +2 ,Co +2 ,Mn +2 ,Pd +2 ) with (N,N`-bis(β-Salicylalimino ethyl)-2,6-pyridine di carboxylic acid) ligand were prepared (6) . This ligand and it`s metal complexes were characterized by using FTIR, HNMR and Mass spectroscopy (7) .Schiff base complexes with transition metal were used as antibacterial and antifungal (8) .…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Photo Study of Di (Meta-Hydroxyl Acetone Phenome) Ethylene Di Amine Cobalt (II) Complexes in Organic Solvents

Sultan¹

2017

djps

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Preparation of Schiff base tetra dentate ligand (bis (m-hydroxy aceto phenone) ethylene di amine). Cobalt (II) complex was prepared with (H) Ligand. Both Ligand and it`s complex were characterized by using FTIR, Uv-visible, Molar conductivity, Kinetic study for the photo chemical study was achieved for the prepared complex by using different polar organic solvent (Di methyl sulfoxide, Chloroform, carbon tetra chloride) by using source of mono wave length (λ =365nm) at 25 C). Order of photo reaction were calculated which showed that reaction was from the first order at the same time the Kd of photo reaction was computed by follow up spectral changes through photo radiation process. Kd value increased by increasing of solvent polarity.

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Surfactant effects on the particle size of iron (III) oxides formed by sol–gel synthesis

Cited by 12 publications

References 33 publications

Engineering a Biocompatible Scaffold with Either Micrometre or Nanometre Scale Surface Topography for Promoting Protein Adsorption and Cellular Response

Engineering a Biocompatible Scaffold with Either Micrometre or Nanometre Scale Surface Topography for Promoting Protein Adsorption and Cellular Response

Magnetic Carbon Nanotubes: Synthesis, Characterization, and Anisotropic Electrical Properties

Preparation, Characterization and Photo Study of Di (Meta-Hydroxyl Acetone Phenome) Ethylene Di Amine Cobalt (II) Complexes in Organic Solvents

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