Bismuth titanate-based UV filters embedded mesoporous silica nanoparticles: Role of bismuth concentration in the self-sealing process

Zaccariello, Gloria; Back, Michele; Benedetti, Alvise; Canton, Patrizia; Cattaruzza, Elti; Onoda, Hiroaki; Glisenti, Antonella; Alimonti, Andrea; Bocca, Beatrice; Riello, Pietro

doi:10.1016/j.jcis.2019.04.042

Cited by 26 publications

(20 citation statements)

References 40 publications

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“…Bismuth oxide-based materials are characterized by interesting properties triggered by the high refractive indexes, low bandgap energies, and the stereochemical activity of the 6s 2 lone-pair electrons (LPE) of Bi 3+ , 22 funding application in many different fields such as fuel cells, 23 UV filters, 24,25 and water splitting. 26,27 Despite the narrow bandgap exhibited by many bismuth-based compounds, they are recently demonstrated to be also very appealing hosts for luminescent ions such as lanthanides and transition metals, showing potential applications as luminescent probes 28−31 and optical thermometers.…”

Section: ■ Introductionmentioning

confidence: 99%

Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

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Casagrande

Brondin

et al. 2020

ACS Appl. Nano Mater.

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The development of nanomaterials with high sensitivity to external stimuli such as temperature is critical to investigate the driving force of not only biological processes but also catalytic mechanisms in extreme environments. However, the instability of nano-objects at high temperatures and different environments is a serious drawback limiting often their real use. This is particularly severe in the case of bismuth-based compounds, making the development of highly stable bismuth-based nanosystems a challenge. Here, we report the synthesis of uniform crystalline lanthanide-doped Bi 2 SiO 5 nanoparticles into a silica shell of a controlled thickness (Bi 2 SiO 5 :Ln@SiO 2 ) for the design of a reliable ratiometric optical thermometer stable at high temperatures and extreme acid environments. The fine control of the SiO 2 shell thickness is modeled based on a theoretical and experimental approach. The formation of the Bi 2 SiO 5 single phase is triggered by the local reactivity between Bi 2 O 3 and SiO 2 in the Bi 2 O 3 @SiO 2 system, leading to a double-layered Bi 2 SiO 5 @SiO 2 hollow nanosystem. The potential of the Bi 2 SiO 5 :Ln@SiO 2 nanosystem as a ratiometric nanothermometer is demonstrated for the upconverting Yb−Er couple. The performances were evaluated in the wide range of linearity of the Boltzmann law (280−800 K) showing suitable values of relative sensitivity, temperature uncertainty, and repeatability (R > 99%) not only for biological applications but also to probe the temperature in extreme environments. In fact, the strategy results in an acid-inert thermal probe up to pH < 1 overcoming the weakness of bismuthbased materials to acid environments with promising properties for in situ thermometry of catalytic reactions.

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Section: ■ Introductionmentioning

confidence: 99%

Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

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Casagrande

Brondin

et al. 2020

ACS Appl. Nano Mater.

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“…Nanomaterials are used in medicine, 97 environmental applications, 98 cosmetics, 99 biotechnology, 100 engineering, 101 and electronics, 100 among others. Rising nanomaterial production has been accompanied by their increasing release into the environment, categorizing nanomaterials as emerging pollutants.…”

Section: Research Areasmentioning

confidence: 99%

Zebrafish as an Emerging Model System in the Global South: Two Decades of Research in Brazil

et al. 2020

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The zebrafish (Danio rerio) is an emerging model system in several research areas worldwide, especially in the Global South. In this context, the present study revised the historical use and trends of zebrafish as experimental models in Brazil. The data concerning the bibliometric parameters, research areas, geographic distribution, experimental design, zebrafish strain, and reporter lines, as well as recent advances were revised. In addition, the comparative trends of Brazilian and global research were discussed. Revised data showed the rapid growth of Brazilian scientific production using zebrafish as a model, especially in three main research areas (Neuroscience &and Behavior, Pharmacology and Toxicology, and Environment/Ecology). Studies were conducted in 19 Brazilian states (70.37%), confirming the wide geographic distribution and importance of zebrafish research. Results indicated that research related to toxicological approaches are widespread in Global South countries such as Brazil. Studies were performed mainly using in vivo tests (89.58%) with adult fish (59.75%) and embryos (30.67%). Moreover, significant research gaps and recommendations for future research are presented. The present study shows that the zebrafish is a suitable vertebrate model system in the Global South.

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“…Silica supports are widely used due to their low cost, good stability, inertness, and easy modulation of their physicochemical properties [30,31,33,40,41]. Furthermore, Fe 3 O 4 magnetic nanoparticles have been used to immobilise cellulase [36,[42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Facile Cellulase Immobilisation on Bioinspired Silica

et al. 2022

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Cellulases are enzymes with great potential for converting biomass to biofuels for sustainable energy. However, their commercial use is limited by their costs and low reusability. Therefore, the scientific and industrial sectors are focusing on finding better strategies to reuse enzymes and improve their performance. In this work, cellulase from Aspergillus niger was immobilised through in situ entrapment and adsorption on bio-inspired silica (BIS) supports. To the best of our knowledge, this green effect strategy has never been applied for cellulase into BIS. In situ entrapment was performed during support synthesis, applying a one-pot approach at mild conditions (room temperature, pH 7, and water solvent), while adsorption was performed after support formation. The loading efficiency was investigated on different immobilisation systems by Bradford assay and FTIR. Bovine serum albumin (BSA) was chosen as a control to optimize cellulase loading. The residual activity of cellulase was analysed by the dinitro salicylic acid (DNS) method. Activity of 90% was observed for the entrapped enzyme, while activity of ~55% was observed for the adsorbed enzyme. Moreover, the supported enzyme systems were recycled five times to evaluate their reuse potential. The thermal and pH stability tests suggested that both entrapment and adsorption strategies can increase enzyme activity. The results highlight that the entrapment in BIS is a potentially useful strategy to easily immobilise enzymes, while preserving their stability and recycle potential.

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Bismuth titanate-based UV filters embedded mesoporous silica nanoparticles: Role of bismuth concentration in the self-sealing process

Cited by 26 publications

References 40 publications

Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

Zebrafish as an Emerging Model System in the Global South: Two Decades of Research in Brazil

Facile Cellulase Immobilisation on Bioinspired Silica

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Bismuth titanate-based UV filters embedded mesoporous silica nanoparticles: Role of bismuth concentration in the self-sealing process

Cited by 26 publications

References 40 publications

Lanthanide-Doped Bi2SiO5@SiO2 Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

Lanthanide-Doped Bi2SiO5@SiO2 Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

Zebrafish as an Emerging Model System in the Global South: Two Decades of Research in Brazil

Facile Cellulase Immobilisation on Bioinspired Silica

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Product

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Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry

Lanthanide-Doped Bi₂SiO₅@SiO₂ Core–Shell Upconverting Nanoparticles for Stable Ratiometric Optical Thermometry