In situ synthesis of ferrites in ionic and neutral cellulose gels

Raymond, Louise; Revol, J.‐F.; Marchessault, R. H.; Ryan, D. H.

doi:10.1016/0032-3861(96)81633-8

Cited by 35 publications

(19 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Magnetic particles in the range of nanosized can be produced and thereby explore a new level of optical and magnetic properties. Iron oxide particles were performed via careful oxidation of ferrous hydroxide precipitated from the ferrous ion-exchanged form of sodium carboxymethyl cellulose fibres and the magnetic fibres containing small ferrite (Fe 3 O 4 ) particles about 10nm in size [1,[6][7][8][9] . In the present work, however, the magnetic fibres were produced via the in situ synthesis of chemical coprecipitation technique by adding ferric (Fe 3+ ) and ferrous (Fe 2+ ) salts into the alkali solution under non oxidizing environment.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Magnetic Paper from Kenaf: Lumen Loading and in situ Synthesis Method

Chia¹,

Zakaria²,

Ahamd³

et al. 2006

American J. of Applied Sciences

View full text Add to dashboard Cite

Abstracts: Magnetic papers have been successfully prepared from unbleached kenaf (hibiscus cannabinus) kraft pulps via the lumen loading and in situ synthesis process. The lumen loading method allows the magnetic fillers to be introduced into the lumen of fibres and at the same time leaving the external surfaces free from filler, resulting the better inter-fibre bonding and subsequently its papermaking properties are not affected. Fillers, which deposited in the lumen of fibres will be protected from further mechanical influences. For the lumen loading process, commercial magnetite (Fe 3 O 4 ) powders have been introduced into the lumen by mixing the pulp and magnetic powder. For the in situ synthesis process, nanosized magnetite particles have been precipitated in the presence of pulp fibres and deposited inside the lumen of fibres via chemical coprecipitation process. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and their magnetization properties were examined by a vibrating sample magnetometer (VSM). The loading degree of the papers was estimated by using the Thermogravimetric analyzer (TGA). The VSM results show that the magnetic properties of the lumen loaded papers are higher compared to the in situ synthesis papers in which can be explained that the nanosized magnetite particles possess superparamagnetic properties. However, the SEM micrograph shows that the size and the distribution of the magnetic particles inside the lumen for the in situ synthesis papers are much better than that of the lumen loading papers.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of Magnetic Paper from Kenaf: Lumen Loading and in situ Synthesis Method

Chia¹,

Zakaria²,

Ahamd³

et al. 2006

American J. of Applied Sciences

View full text Add to dashboard Cite

show abstract

“…In the next steps, iron salt is precipitated in an alkaline solution, and subsequently oxidized into a magnetic form(16,18) in the presence of air or hydrogen peroxide.Downloaded by NANYANG TECH UNIV LIB on November 3, 2014 | http://pubs.acs.org Publication Date: June 22, 2006 | doi: 10.1021/bk-2006-0934.ch014 When hydrogen peroxide was used as an oxidant, several precipitationoxidation cycles were needed in order to obtain high magnetic response of the material, and each cycle required addition of fresh Fe 2+ solution. Magnetic responsiveness of the particles was estimated by means of extraction sample magnetometry (Fig.…”

mentioning

confidence: 99%

Iron-Polysaccharide Composites for Pharmaceutical Applications

Shingel

Marchessault

2006

ACS Symposium Series

View full text Add to dashboard Cite

Polysaccharide-stabilized iron complexes are an important class of biomaterials with numerous applications, including iron supplement for treating anemia, contrast agents for magnetic resonance imaging, and magnetic separation of cells and protein. An original procedure for the "in situ" synthesis of ferrites is proposed and applied successfully to a series of carbohydrate matrices, differing in chemical structure and molecular organization, i.e. semi-crystalline, cross-linked, composites, etc. The method implies introduction of the iron salt into microvoids of polysaccharide platforms, followed by oxidation of iron hydroxide under alkaline conditions. The particles synthesized via "in situ" method are characterized by high magnetic responsiveness and represent an excellent support for covalent attachment of proteins, which make them suitable for the magnetic separation of pharmaceutically important biomolecules.

show abstract

“…The size of the ferrite particles varies from ~2 to 20 nm with the particles existing both individually and as aggregates in the matrix. These magnetic BC membranes are superparamagnetic at room temperature with no coercivity or remanence (Raymond et al, , 1995Sourty et al, 1998;Small & Johnston, 2009). …”

Section: Magnetic Cellulose Filmsmentioning

confidence: 99%