Synthesis and characterization of SiO2–La2O3 gels obtained in a water-free environment

Nowicki, W.; Rypka, Ganna; Kawałko, Adriana; Tolińska, Agnieszka; Kirszensztejn, Piotr

doi:10.1007/s10853-014-8134-2

Cited by 15 publications

(4 citation statements)

References 24 publications

(28 reference statements)

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“…Key features include the sharp oxirane absorption peak at 913 cm -1 and a number of peaks in the range 1035-1244 cm -1 that are associated with C-O bonds and which evince the presence of ether linkages in the resin. The only significant difference stems from the presence of the silica in the Nanopox E 470, which results in broad IR bands in the region 460 to 1080 cm -1 as a result of the stretching and the bending modes of Si-O-Si bonds [38][39][40]. Figure 2 shows a selection of representative FTIR data obtained from a number of cured samples.…”

Section: The Chemistry Of Curingmentioning

confidence: 99%

The effect of resin stoichiometry and nanoparticle addition on epoxy/silica nanodielectrics

Nguyen

Vaughan

Lewin

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Epoxy-based systems are used widely as dielectrics in electrical applications and, in such systems, the chosen stoichiometry is important in determining the nature of the molecular network that forms and, hence, the physical properties of the final system. However, the inclusion of nanoparticles with large interfacial areas into epoxy systems may introduce additional chemical reactions between moieties on the nanoparticle surfaces and the reactants, or may alter the rate and sequence of the various chemical pathways that occur during curing, with the consequence that the cross-linked network that forms within the matrix polymer will be altered. This study set out to investigate the effects of resin stoichiometry on material properties, including the glass transition temperature and electrical breakdown strength of an epoxy resin and its nanocomposites filled with silica particles, which were introduced using a Nanopox masterbatch system. The results indicate that the nanosilica affects network formation in complex ways and that the concept of an optimum stoichiometry is highly dependent upon the property of interest. From the perspective of breakdown strength, a stoichiometric excess of anhydride hardener is detrimental; the introduction of nanoparticles has a comparable effect to an excess of hardener.

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Section: The Chemistry Of Curingmentioning

confidence: 99%

The effect of resin stoichiometry and nanoparticle addition on epoxy/silica nanodielectrics

Nguyen

Vaughan

Lewin

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…In view of the earlier studies performed on similar binary gels [32][33][34][35][36] with Al 2 O 3 or SiO 2 as a matrix, a similar approach was applied in the design and synthesis of a catalyst with metal phase. The proposed method for the synthesis of a binary oxide support based on employing sol-gel processes, permitted the elimination of the presence of inorganic additives that could obscure the process of interaction between the metal phase precursor and the support surface.…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed Pt on B2O3/Al2O3 support: catalytic properties in the total oxidation of 1-butene

Przekop

Kirszensztejn

2016

Reac Kinet Mech Cat

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Applying a newly proposed method for the synthesis of a binary system Al 2 O 3 /B 2 O 3 , a series of metal phase supports with the ratio of B:Al components varied in the range from 0.05 to 1 was obtained. The supports were loaded with a metal phase from the water solution of H 2 PtCl 6 to get the final load of 1 % of the metallic phase. The samples were subjected to thermal treatment under oxidizing or reducing conditions. The degree of dispersion of the metal phase, evaluated on the basis of hydrogen chemisorption, was very high, reaching a maximum of over 150 %. The catalytic performance of the catalysts was tested in the reaction of temperature-programmed complete oxidation of 1-butene.

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“…Lanthanum (La) is a rare-earth (RE) element and is finding many technological and industrial applications in the form of lanthanum oxide (La 2 O 3 ), such as chemical catalysts, laser material, precision optical glasses, electrode material, light-emitting material (blue powder) and hydrogen storage material [178,179]. It is also employed in many biomedical applications, such as targeted drug delivery within the body, suppression of bacteria and viruses [180][181][182], binding agent for several proteins, calcium channel suppression, fluorescence dyes and ROS scavenging activity [181,183].…”

Section: Oxygen-deficient Lanthanum Oxidementioning

confidence: 99%

Microenvironmental Behaviour of Nanotheranostic Systems for Controlled Oxidative Stress and Cancer Treatment

et al. 2022

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The development of smart, efficient and multifunctional material systems for diseases treatment are imperative to meet current and future health challenges. Nanomaterials with theranostic properties have offered a cost effective and efficient solution for disease treatment, particularly, metal/oxide based nanotheranostic systems already offering therapeutic and imaging capabilities for cancer treatment. Nanoparticles can selectively generate/scavenge ROS through intrinsic or external stimuli to augment/diminish oxidative stress. An efficient treatment requires higher oxidative stress/toxicity in malignant disease, with a minimal level in surrounding normal cells. The size, shape and surface properties of nanoparticles are critical parameters for achieving a theranostic function in the microenvironment. In the last decade, different strategies for the synthesis of biocompatible theranostic nanostructures have been introduced. The exhibition of therapeutics properties such as selective reactive oxygen species (ROS) scavenging, hyperthermia, antibacterial, antiviral, and imaging capabilities such as MRI, CT and fluorescence activity have been reported in a variety of developed nanosystems to combat cancer, neurodegenerative and emerging infectious diseases. In this review article, theranostic in vitro behaviour in relation to the size, shape and synthesis methods of widely researched and developed nanosystems (Au, Ag, MnOx, iron oxide, maghemite quantum flakes, La2O3−x, TaOx, cerium nanodots, ITO, MgO1−x) are presented. In particular, ROS-based properties of the nanostructures in the microenvironment for cancer therapy are discussed. The provided overview of the biological behaviour of reported metal-based nanostructures will help to conceptualise novel designs and synthesis strategies for the development of advanced nanotheranostic systems.

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Synthesis and characterization of SiO2–La2O3 gels obtained in a water-free environment

Cited by 15 publications

References 24 publications

The effect of resin stoichiometry and nanoparticle addition on epoxy/silica nanodielectrics

The effect of resin stoichiometry and nanoparticle addition on epoxy/silica nanodielectrics

Highly dispersed Pt on B2O3/Al2O3 support: catalytic properties in the total oxidation of 1-butene

Microenvironmental Behaviour of Nanotheranostic Systems for Controlled Oxidative Stress and Cancer Treatment

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