Experimental Characterization of the Nanoparticle Size Effect on the Mechanical Stability of Nanoparticle-Based Coatings

Heni, Wajdi; Vonna, Laurent; Haïdara, Hamidou

doi:10.1021/nl503768r

Cited by 27 publications

(26 citation statements)

References 42 publications

(64 reference statements)

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“…Hence, establishing stability and cytotoxicity behaviour of such materials/implants are of vital importance. While the use of nanoparticle coatings are prevalent, dissolution of coating ions into the biological environment and loss of functionality over time is possible [ 137 – 140 ], which has large repercussions involving toxicity to the human body.…”

Section: Stability and Toxicity Of Micro And Nanomaterialsmentioning

confidence: 99%

Bio-mimicking nano and micro-structured surface fabrication for antibacterial properties in medical implants

et al. 2017

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Orthopaedic and dental implants have become a staple of the medical industry and with an ageing population and growing culture for active lifestyles, this trend is forecast to continue. In accordance with the increased demand for implants, failure rates, particularly those caused by bacterial infection, need to be reduced. The past two decades have led to developments in antibiotics and antibacterial coatings to reduce revision surgery and death rates caused by infection. The limited effectiveness of these approaches has spurred research into nano-textured surfaces, designed to mimic the bactericidal properties of some animal, plant and insect species, and their topographical features. This review discusses the surface structures of cicada, dragonfly and butterfly wings, shark skin, gecko feet, taro and lotus leaves, emphasising the relationship between nano-structures and high surface contact angles on self-cleaning and bactericidal properties. Comparison of these surfaces shows large variations in structure dimension and configuration, indicating that there is no one particular surface structure that exhibits bactericidal behaviour against all types of microorganisms. Recent bio-mimicking fabrication methods are explored, finding hydrothermal synthesis to be the most commonly used technique, due to its environmentally friendly nature and relative simplicity compared to other methods. In addition, current proposed bactericidal mechanisms between bacteria cells and nano-textured surfaces are presented and discussed. These models could be improved by including additional parameters such as biological cell membrane properties, adhesion forces, bacteria dynamics and nano-structure mechanical properties. This paper lastly reviews the mechanical stability and cytotoxicity of micro and nano-structures and materials. While the future of nano-biomaterials is promising, long-term effects of micro and nano-structures in the body must be established before nano-textures can be used on orthopaedic implant surfaces as way of inhibiting bacterial adhesion.

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Section: Stability and Toxicity Of Micro And Nanomaterialsmentioning

confidence: 99%

Bio-mimicking nano and micro-structured surface fabrication for antibacterial properties in medical implants

et al. 2017

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“…We believe it is porosity and strength of the bonding between the grains that affect the mechanical properties of the films. In the case of V s = 0 kV, fragile NP coatings with poor mechanical properties are formed due to the weak adhesive van der Waals interaction between NPs and substrate [ 62 ].When increasing the substrate voltage, the strengthening is attributed to the high temperatures that arise locally when the NPs impact on the substrate [ 63 ]. Due to the high temperatures lead to partial coalescence of the NPs and neck formation.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

Michelakaki¹,

Boukos²,

Dragatogiannis³

et al. 2018

Beilstein J. Nanotechnol.

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In this work we study the fabrication and characterization of hafnium nanoparticles and hafnium nanoparticle thin films. Hafnium nanoparticles were grown in vacuum by magnetron-sputtering inert-gas condensation. The as deposited nanoparticles have a hexagonal close-packed crystal structure, they possess truncated hexagonal biprism shape and are prone to surface oxidation when exposed to ambient air forming core–shell Hf/HfO2 structures. Hafnium nanoparticle thin films were formed through energetic nanoparticle deposition. This technique allows for the control of the energy of charged nanoparticles during vacuum deposition. The structural and nanomechanical properties of the nanoparticle thin films were investigated as a function of the kinetic energy of the nanoparticles. The results reveal that by proper adjustment of the nanoparticle energy, hexagonal close-packed porous nanoparticle thin films with good mechanical properties can be formed, without any additional treatment. It is shown that these films can be patterned on the substrate in sub-micrometer dimensions using conventional lithography while their porosity can be well controlled. The fabrication and experimental characterization of hafnium nanoparticles is reported for the first time in the literature.

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“…Because of the “quantum size effect”, the properties of NPs can be greatly influenced by their size . It has been reported that their surface free energy will be enhanced when their size is minimized . When NPs are smaller than 2 nm in diameter, a high surface free energy will keep the NPs in a “boiling state”, which further causes poor stability and thus a tendency to aggregate and loss of catalytic performance…”

Section: Introductionmentioning

confidence: 99%

“…[3] It has been reported that their surface free energy will be enhanced when their size is minimized. [4] When NPs are smaller than 2nmindiameter,ahigh surface free energy will keep the NPs in a" boiling state", which further causes poor stability and thus atendency to aggregate and loss of catalytic performance. [5] Loading of nanomaterials on high-surface-area supports to give heterogeneous catalysts is af easible strategy to improve stability and catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Embedding Ultrasmall Au Clusters into the Pores of a Covalent Organic Framework for Enhanced Photostability and Photocatalytic Performance

Deng

Zhang

et al. 2020

Angewandte Chemie

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Gold clusters loaded on various supports have been widely used in the fields of energy and biology. However, the poor photostability of Au clusters on support interfaces under prolonged illumination usually results in loss of catalytic performance. Covalent organic frameworks (COFs) with periodic and ultrasmall pore structures are ideal supports for dispersing and stabilizing Au clusters, although it is difficult to encapsulate Au clusters in the ultrasmall pores. In this study, a two‐dimensional (2D) COF modified with thiol chains in its pores was prepared. With −SH groups as nucleation sites, Au nanoclusters (NCs) could grow in situ within the COF. The ultrasmall pores of the COF and the strong S−Au binding energy combine to improve the dispersibility of Au NCs under prolonged light illumination. Interestingly, Au–S–COF bridging as observed in this artificial Z‐scheme photocatalytic system is deemed to be an ideal means to increase charge‐separation efficiency.

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Experimental Characterization of the Nanoparticle Size Effect on the Mechanical Stability of Nanoparticle-Based Coatings

Cited by 27 publications

References 42 publications

Bio-mimicking nano and micro-structured surface fabrication for antibacterial properties in medical implants

Bio-mimicking nano and micro-structured surface fabrication for antibacterial properties in medical implants

Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

Embedding Ultrasmall Au Clusters into the Pores of a Covalent Organic Framework for Enhanced Photostability and Photocatalytic Performance

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