Combining mesoporous silica–magnetite and thermally-sensitive polymers for applications in hyperthermia

Azevedo, Raquel C. S.; Sousa, Ricardo Geraldo de; Macedo, W. A. A.; Sousa, Edésia Martins Barros de

doi:10.1007/s10971-014-3307-7

Cited by 21 publications

(7 citation statements)

References 37 publications

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“…The absorption peak at 660 cm −1 is due to the formation of silicon–oxygen–iron bonds (Si–O–Fe) in the structure of glass . The results show that some Fe 3+ form the [FeO 4 ] tetrahedrons like the Si 4+ , mending the structure and increasing the viscosity of the glass in SiO 2 ‐rich domain . At the same time, the oxygen ion of ferric oxide was snatched for charge balance to prompt the formation of magnetite.…”

Section: Resultsmentioning

confidence: 97%

Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

Liu

Zhu

Zhang

et al. 2018

Int J Applied Ceramic Tech

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Ferrimagnetic nano‐crystal glass‐ceramics and glass fibers were prepared based on the ferrosilicate glass system of SiO2–Fe2O3–B2O3–Al2O3 using large amount of pyrite slag (PS) and small quantities of pure chemicals. Two different fabrication methods were employed, eg, annealing and fiber‐drawing method, without performing any nucleation and crystallization heat treatments. The influence of PS content on the magnetite spontaneous crystallization is investigated by the X‐ray diffraction, FTIR, SEM, and TEM. The X‐ray diffraction patterns show the presence of nanometric magnetite crystals in glass matrix. The ferrimagnetic glass fibers with a diameter of about 20 μm were one‐step drawn. The magnetic hysteresis loops of the glass‐ceramic and glass fiber samples were analyzed using a vibrating sample magnetometer (VSM). Electromagnetic parameters of samples were also examined.

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Section: Resultsmentioning

confidence: 97%

Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

Liu

Zhu

Zhang

et al. 2018

Int J Applied Ceramic Tech

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“…This historical trend may as well apply to innovation in materials science and other disciplines. To some extent, however, one meaningful point makeable by those who insist on depositing additional layers onto silica-coated iron oxides is supported by the following inference derivable after going through this history of major findings in silica-coated iron oxides: namely, rare exceptions aside, no significant drug loading capacity and no smart, environmentally responsive properties were achieved in the material without the third shell, which has been typically polymeric in nature. − One such outer polymeric shell, as some may notice, also represents a carbonaceous coating, such as the one forming the crust of the earthicle. Although it is not monatomic, the presence of hydrogen and oxygen in it make it even more reflective of the biosphere and more in accordance with the idea of the earthicle than a monatomic carbon crust is.…”

Section: Biphasic Silica-coated Iron (Oxide) Compositionsmentioning

confidence: 99%

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Uskoković

2020

ACS Earth Space Chem.

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Earthicle was conceived as an astromimetic particle mimicking the stratified structure of Earth. Although earthicle can come in various compositional and structural forms, its seminal version consisted of a spherical nanoparticle with an iron core, a silica shell, and a carbon crust. This study provides a historical review of composite, core/shell particles composed of four different combinations of phases present in this original version of the earthicle, three of which are biphasic and one of which is triphasic: iron(oxide)/silica, iron(oxide)/carbon, silica/carbon, and iron(oxide)/silica/carbon. The connection of all four types of particles to materials of astrophysical origin found in interstellar and interplanetary space is discussed. The referred studies on the three biphasic compositions were selected on the basis of their conceptual and methodological innovativeness or originality in terms of the analytical data. In contrast, all studies that have reported so far on the synthesis, characterization, or application of the hybrid particles with the triphasic composition, along with a number of related studies, are reviewed. The chronological perspective adopted for both types of hybrid compositions, biphasic and triphasic, allowed for the deduction of past and present trends in the research of these composite systems but also for the extrapolation of probable future trends. For example, the interest in silica-coated iron (oxides) has been greater than that in other three core/shell systems, especially in biomedical studies, one reason being the difference in reactivity and in the favored oxidation state of the magnetic core under silica and under carbon. The early focus of research on silica-coated iron (oxides) was mostly on controlling the synthesis process, but as of the early 2000s the interest in controlling the properties and devising new applications for these systems became dominant among the scientific community. Carbon-coated silica particles have been the least studied and have had the least impact among the three biphasic combinations reviewed, especially in the biomedical field where their research has been virtually none. Revived briefly around 2010, the interest in them wound down soon thereafter in favor of more complex compositions. Still, the most complex hybrid composition reviewed here, comprising iron (oxide) particles shelled doubly, first with silica and then with carbon, was the least studied of all four multiphasic compositions elaborated here. However, unlike the ups and downs in the research on the biphasic compositions in the particulate form, the corresponding interest in these triphasic particles has been continually increasing, in spite of the comparatively low number of literature reports on them. This promising trend emerging from the literature search may go hand-in-hand with the ongoing global tendency to fabricate complex composite particle structures in search of novel properties arising from the sometimes theoretically predictable and sometimes serendipitous synergies be...

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“…Recently, the progress of nanocomposite materials containing metal oxide nanoparticles have attracted considerable attention owning to generating new materials with interesting physicochemical properties in many areas of science . Homogeneity of the prepared nano mixed materials affects their physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

Derikvand

Rahmati

Azadbakht

2019

Applied Organom Chemis

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Highly ordered mesoporous molecular sieves AlMCM‐41 and a new NiO/AlMCM‐41 nanocomposite were synthesized using a sol–gel method. Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and N2 adsorption desorption analyses were used to examine the structure, morphology, size and phase composition of the synthesized NiO/AlMCM‐41 nanocomposites. AlMCM‐41 embedded with NiO nanoparticles was subsequently prepared using different nickel loadings in a direct synthetic route. The results show the successful deposition of NiO nanoparticles onto the framework of AlMCM‐41. AlMCM‐41 provides enormous benefits such as environmentally safe, economic viability and porosity when used as support for NiO nanoparticles. The excellent catalytic activities of AlMCM‐41 and NiO/AlMCM‐41 were investigated for the reduction of nitrophenols (4‐NP, 2‐NP) to aminophenols (4‐AP, 2‐AP) in water at ambient temperature. The best observed performance of reduction of NP with 100% conversion into analogous amino derivatives occurred within 6 min with an estimated rate constant of 0.46 min−1. The efficiency of reduction was observed to increase as a function of NiO enrichment. The NiO/AlMCM‐41 nanocomposite could be recycled and reused up to five times without noticeable change in its structure and activity. These properties make NiO/AlMCM‐41 nanocomposite an ideal platform to study various heterogeneous catalytic processes which can have application in purification, catalysis, sensing devices, and green chemistry.

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Combining mesoporous silica–magnetite and thermally-sensitive polymers for applications in hyperthermia

Cited by 21 publications

References 37 publications

Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

Synthesis and properties of ferrimagnetic glass‐ceramics and glass fibers derived from pyrite slag

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

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