Particle anisotropy and crystalline phase transition in one-pot synthesis of nano-zirconia: a causal relationship

Tana, Francesca; Serafini, Andrea; Lutterotti, Luca; Cigada, A.; Variola, Fabio; Bondioli, Federica; Nardo, Luigi De

doi:10.1039/c7ce01949a

Cited by 11 publications

(5 citation statements)

References 65 publications

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“…10 nm. [12,32] Previous reports have discussed that different parameters such as reaction temperature, [33] precursor concentration [34] or the presence of different chemical species at the surface of the NPs [35] can affect the crystalline structure of ZrO 2 NPs obtained through colloidal chemistry routes. As discussed below, the different steric hindrance of the molecules used in the present study during the nucleation and growth steps and the chemical interaction between their functional groups and the inorganic surface can also be at the origin of the different morphologies and sizes obtained, thus influencing the final crystalline structures of the objects.…”

Section: Resultsmentioning

confidence: 99%

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Venier,

Brissaud,

Cormary

et al. 2024

ChemNanoMat

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We present a straightforward one‐pot hydrothermal method for the synthesis of zirconia nanodispersions, leading to the formation of stable sols. By simply varying the nature of the stabilizer used, one can obtain a large variety of objects with different sizes, shapes and crystallinities. Our results demonstrate the crucial role played by aliphatic amino acids both during the formation of the objects and after, since their interaction with the surface of the inorganic crystals influences strongly the optical properties and colloidal stability of the latter. Importantly, the versatility of this method allows for the introduction of different dopants, increasing substantially the scope of applications that can be achieved with such nanoscale oxides. The high transparencies and the easy dispersibility of nanoparticles in different liquid matrixes ensure the formation of zirconia‐based nanocomposites and ceramics with outstanding optical features for the orthopedic, dental, photonics and chemical sectors. This method can be easily scaled up, being already available for the production of high‐quality zirconia nanodispersions at the industrial level.

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Section: Resultsmentioning

confidence: 99%

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Venier,

Brissaud,

Cormary

et al. 2024

ChemNanoMat

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“…[40][41][42] Nonclassical crystallization occurring through amorphous intermediates has been shown for HfO 2 , [12] ZrO 2 , [43] and yttria-stabilized ZrO 2 . [44] Nonclassical crystallization pathways for particles have been proposed in ZrO 2 by oriented attachment or oriented aggregation mechanisms, [45][46][47][48][49][50] where the amount of aggregation or attachment has been shown to influence the crystallographic phases that form. [47,48,51] Here, the phase evolution of Hf 0.5 Zr 0.5 O 2 nanoparticles from an intermediate amorphous phase is presented.…”

Section: Introductionmentioning

confidence: 99%

Leveraging Crystallization Pathway to Control Structure in Hf_0.5Zr_0.5O₂ Nanoparticles

Anguish,

Andrew

2024

Adv Eng Mater

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Hf0.5Zr0.5O2‐based materials have garnered significant attention for applications requiring ferroelectricity at the nanoscale. This behavior arises due to the stabilization of metastable phases at room temperature. However, the synthesis of phase pure Hf0.5Zr0.5O2 remains a challenging problem in both thin films and nanoparticles. Here, the crystallization of Hf0.5Zr0.5O2 nanoparticles from an as‐synthesized amorphous phase is studied. By tailoring the aggregate nature of the intermediate amorphous nanoparticles via different drying processes the crystallization pathway could be altered, resulting in significant differences in crystal structure, crystallite size, and crystallite morphology after calcination. X‐ray diffraction (XRD) and Rietveld refinement show the dominant crystallographic phase changes from a monoclinic structure to a cubic structure for samples with decreased aggregation. Samples prepared via freeze drying, exhibited the most aggregation control and correspond with the observation of single‐crystalline particle aggregates and branching structures attributed to a crystallization by particle attachment mechanism. Here, differing crystallization pathways lead to unique crystal morphologies that stabilize the traditionally high temperature phases of Hf0.5Zr0.5O2‐based materials that are necessary for functional applications.This article is protected by copyright. All rights reserved.

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“…Surface modifications were able to improve both the initial efficacy and long-term antibacterial efficiency [9]. Notably, there is evidence that the various molecular and biological process at the implant/tissue interface are principally stimulated by nanoscale surface properties because material-host tissue interactions are guided by nanometric cues [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous zirconia surfaces with anti-biofilm properties for dental implants

et al. 2021

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Cytocompatible bioactive surface treatments conferring antibacterial properties to osseointegrated dental implants are highly requested to prevent bacteria-related peri-implantitis. Here we focus on a newly designed family of mesoporous coatings based on zirconia (ZrO2) microstructure doped with gallium (Ga), exploiting its antibacterial and pro-osseo-integrative properties. The ZrO2 films were obtained via sol–gel synthesis route using Pluronic F127 as templating agent, while Ga doping was gained by introducing gallium nitrate hydrate. Chemical characterization by means of x-ray photoelectron spectroscopy and glow discharge optical emission spectroscopy confirmed the effective incorporation of Ga. Then, coatings morphological and structural analysis were carried out by transmission electron microscopy and selected area electron diffraction unveiling an effective stabilization of both the mesoporous structure and the tetragonal ZrO2 phase. Specimens’ cytocompatibility was confirmed towards gingival fibroblast and osteoblasts progenitors cultivated directly onto the coatings showing comparable metabolic activity and morphology in respect to controls cultivated on polystyrene. The presence of Ga significantly reduced the metabolic activity of the adhered oral pathogens Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans in comparison to untreated bulk zirconia (p < 0.05); on the opposite, Ga ions did not significantly reduce the metabolism of the oral commensal Streptococcus salivarius (p > 0.05) thus suggesting for a selective anti-pathogens activity. Finally, the coatings’ ability to preserve cells from bacterial infection was proved in a co-culture method where cells and bacteria were cultivated in the same environment: the presence of Ga determined a significant reduction of the bacteria viability while allowing at the same time for cells proliferation. In conclusion, the here developed coatings not only demonstrated to satisfy the requested antibacterial and cytocompatibility properties, but also being promising candidates for the improvement of implantable devices in the field of implant dentistry.

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Particle anisotropy and crystalline phase transition in one-pot synthesis of nano-zirconia: a causal relationship

Abstract: The effects of experimental variables on zirconia nanocrystal growth are investigated, correlating the morphological transformations with phase composition in synthesized nanopowders.

Cited by 11 publications

References 65 publications

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Leveraging Crystallization Pathway to Control Structure in Hf_0.5Zr_0.5O₂ Nanoparticles

Mesoporous zirconia surfaces with anti-biofilm properties for dental implants

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Particle anisotropy and crystalline phase transition in one-pot synthesis of nano-zirconia: a causal relationship

Abstract: The effects of experimental variables on zirconia nanocrystal growth are investigated, correlating the morphological transformations with phase composition in synthesized nanopowders.

Cited by 11 publications

References 65 publications

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Amino Acid‐Mediated Formation of Zirconia Nanoparticles and their Transparent Dispersions

Leveraging Crystallization Pathway to Control Structure in Hf0.5Zr0.5O2 Nanoparticles

Mesoporous zirconia surfaces with anti-biofilm properties for dental implants

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Leveraging Crystallization Pathway to Control Structure in Hf_0.5Zr_0.5O₂ Nanoparticles