Sintering behaviour of celsian based ceramics obtained from the thermal conversion of (Ba, Sr)-exchanged zeolite A

Marocco, Antonello; Liguori, Barbara; Dell’Agli, Gianfranco; Pansini, Michele

doi:10.1016/j.jeurceramsoc.2011.04.028

Cited by 31 publications

(25 citation statements)

References 26 publications

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“…Through cation exchange, different TM cations (also more than one contemporaneously) may be introduced in the zeolite framework to a various extent, which affects the magnetic metal(s) nanoparticles. Moreover, through cation exchange as well as alkaline-earth cations (e.g., Ba 2+ and Sr 2+ ) may be introduced into the zeolite framework, thus giving rise to ceramic phases, which modify the features of the ceramic matrix [70,71]. (3) The temperature and time of the thermal treatment under the reducing atmosphere.…”

Section: Ceramic Nanocompositesmentioning

confidence: 99%

Magnetic Properties of Nanocomposites

et al. 2019

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The magnetic properties of various families of nanocomposite materials containing nanoparticles of transition metals or transition-metal compounds are reviewed here. The investigated magnetic nanocomposites include materials produced either by dissolving a ferrofluid containing pre-formed nanoparticles of desired composition and size in a fluid resin submitted to subsequent curing treatment, or by generating the nanoparticles during the very synthesis of the embedding matrix. Two typical examples of these production methods are polymer nanocomposites and ceramic nanocomposites. The resulting magnetic properties turn out to be markedly different in these two classes of nanomaterials. The control of nanoparticle size, distribution, and aggregation degree is easier in polymer nanocomposites, where the interparticle interactions can either be minimized or exploited to create magnetic mesostructures characterized by anisotropic magnetic properties; the ensuing applications of polymer nanocomposites as sensors and in devices for Information and Communication Technologies (ICT) are highlighted. On the other hand, ceramic nanocomposites obtained from transition-metal loaded zeolite precursors exhibit a remarkably complex magnetic behavior originating from the simultaneous presence of zerovalent transition-metal nanoparticles and transition-metal ions dissolved in the matrix; the applications of these nanocomposites in biomedicine and for pollutant remediation are briefly discussed.

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Section: Ceramic Nanocompositesmentioning

confidence: 99%

Magnetic Properties of Nanocomposites

et al. 2019

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“…The solid was, then, separated from the liquid by filtration and contacted again with a fresh solution. In total, the procedure was iterated 8 and 5 times with Na-A and Na-X zeolite, respectively, due to their different exchange capacities [51,52]. The Fe 2+ exchanged zeolites (hereafter referred to as Fe-A and Fe-X zeolite) were washed with ddH 2 O, dried at 80 • C for 24 h, and stored for at least 72 h in a 50% relative humidity environment (as obtained by using a saturated Ca(NO 3 ) 2 solution); this storage method resulting in the zeolite water saturation.…”

Section: Chemicals and Materials Synthesismentioning

confidence: 99%

Separation of Biological Entities from Human Blood by Using Magnetic Nanocomposites Obtained from Zeolite Precursors

et al. 2020

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In this work, three novel magnetic metal–ceramic nanocomposites were obtained by thermally treating Fe-exchanged zeolites (either A or X) under reducing atmosphere at relatively mild temperatures (750–800 °C). The so-obtained materials were thoroughly characterized from the point of view of their physico-chemical properties and, then, used as magnetic adsorbents in the separation of the target gene factors V and RNASE and of the Staphylococcus aureus bacteria DNA from human blood. Such results were compared with those obtained by using a top ranking commercial separation system (namely, SiMAG-N-DNA by Chemicell). The results obtained by using the novel magnetic adsorbents were similar to (or even better than) those obtained by using the commercial system, both during manual and automated separations, provided that a proper protocol was adopted. Particularly, the novel magnetic adsorbents showed high sensitivity during tests performed with small volumes of blood. Finally, the feasible production of such magnetic adsorbents by an industrial process was envisaged as well.

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“…The thermal transformation of cation exchanged zeolites was then used in successive works to produce ceramics of high technological interest and specifically for the synthesis of the monoclinic polymorph of barium feldspar celsian …”

Section: Introductionmentioning

confidence: 99%

Sintering behavior of Ba/Sr celsian precursor obtained from zeolite‐A by ion‐exchange method

et al. 2017

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(Ba, Sr)‐exchanged zeolite A with composition Ba0.74Sr0.22Na0.04Al2Si2O8 was prepared by cation exchange; a mild thermal treatment converts into an amorphous phase. Successive crystallization and sintering behavior was studied by XRD, DTA, and thermodilatometric analysis. The results point out the activation of viscous flow sintering mechanisms between 900°C and 1050°C. The densification process starts when the amorphous phase reaches its glass transition temperature (897°C) and finishes when the material crystallizes forming hexacelsian. The application of an external pressure in such temperature range allows to achieve an almost complete densification, the material transforming at 1300°C into dense monoclinic celsian much below the typical processing temperature.

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Sintering behaviour of celsian based ceramics obtained from the thermal conversion of (Ba, Sr)-exchanged zeolite A

Cited by 31 publications

References 26 publications

Magnetic Properties of Nanocomposites

Magnetic Properties of Nanocomposites

Separation of Biological Entities from Human Blood by Using Magnetic Nanocomposites Obtained from Zeolite Precursors

Sintering behavior of Ba/Sr celsian precursor obtained from zeolite‐A by ion‐exchange method

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