Adsorbate Screening of Surface Charge of Microscopic Ferroelectric Domains in Sol–Gel PbZr0.2Ti0.8O3 Thin Films

Copie, O.; Chevalier, Nicolas; Rhun, G. Le; Rountree, Cindy; Martinotti, D.; Gonzalez, Sara; Mathieu, Claire; Renault, O.; Barrett, N.

doi:10.1021/acsami.7b08925

Cited by 25 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1d-g. On the surface of poled piezoelectric materials, bound charges are balanced by screening charges, thus the material is electrically neutral 33 , as shown in Fig. 1d.…”

Section: Resultsmentioning

confidence: 99%

Piezo-catalysis for nondestructive tooth whitening

et al. 2020

View full text Add to dashboard Cite

The increasing demand for a whiter smile has resulted in an increased popularity for tooth whitening procedures. The most classic hydrogen peroxide-based whitening agents are effective, but can lead to enamel demineralization, gingival irritation, or cytotoxicity. Furthermore, these techniques are excessively time-consuming. Here, we report a nondestructive, harmless and convenient tooth whitening strategy based on a piezo-catalysis effect realized by replacement of abrasives traditionally used in toothpaste with piezoelectric particles. Degradation of organic dyes via piezo-catalysis of BaTiO 3 (BTO) nanoparticles was performed under ultrasonic vibration to simulate daily tooth brushing. Teeth stained with black tea, blueberry juice, wine or a combination thereof can be notably whitened by the poled BTO turbid liquid after vibration for 3 h. A similar treatment using unpoled or cubic BTO show negligible tooth whitening effect. Furthermore, the BTO nanoparticle-based piezocatalysis tooth whitening procedure exhibits remarkably less damage to both enamel and biological cells.

show abstract

“…1d-g. On the surface of poled piezoelectric materials, bound charges are balanced by screening charges, thus the material is electrically neutral 33 , as shown in Fig. 1d.…”

Section: Resultsmentioning

confidence: 99%

Piezo-catalysis for nondestructive tooth whitening

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This technique provides full-field, noncontact imaging of surface potential with a spatial resolution better than 20 nm [31]. Incident electrons with very low kinetic energy are reflected before reaching the surface [using mirror electron microscopy (MEM)], while the electrons with higher energy can penetrate the sample surface and are elastically backscattered (LEEM) [31][32][33][34]. The transition between MEM and LEEM provides a direct measure of the surface potential.…”

Section: Introductionmentioning

confidence: 99%

Interaction of low-energy electrons with surface polarity near ferroelastic domain boundaries

Zhao

Barrett

et al. 2019

Phys. Rev. Materials

View full text Add to dashboard Cite

We derive surface polarity at and near ferroelastic domain boundaries from molecular dynamics simulations based on an ionic spring model. Interatomic gradient forces lead to flexoelectricity which, in turn, generates polarity at the surface and in twin boundaries. We then derive generic properties of electron scattering spectra equivalent to those observed in low-energy electron microscopy (LEEM) and mirror electron microscopy (MEM) experiments. Negatively (positively) charged surfaces reflect (attract) incident electrons with low kinetic energy. The electron images reveal the valley and ridge surface structures near the intersection of the twin boundary and the surface. Polarity in surface layers is predicted to be visible in LEEM and MEM spectra at neutral surfaces, but much less when surfaces are charged. Inward polarity reflects electrons similar to negative surface charges, and outward polarity backscatters electrons like positive surface charges. Both the polarity in the twin boundary and the physical topography scatter electrons, consistent with experimental LEEM and MEM experiments on CaTiO 3 with (001) and (111) surface terminations.

show abstract

“…[85] As in many other applications involving a template, any other sol-gel precursor can be employed, for example for obtaining titania (from TiCl 4 , tested). This allows us to variate the surface (charge and chemistry) [86][87][88][89][90][91][92] and structural (elasticity, porosity) [85,[93][94][95] properties of the material composing the nanochannel. Shape, dimensions and aspect ratio of the pillar porosity are, however, conserved since they are determined by the initial thickness and hole distance/ diameter of the block-copolymer thin film.…”

Section: Methodsmentioning

confidence: 99%

Ionic Diffusion, Nanoparticle Formation and Trapping Within Sol‐Gel Made Pillared Planar Nanochannels in a Simple Microfluidic Device

2020

View full text Add to dashboard Cite

Efforts to obtain widespread applications in the field of nanofluidics are increasing in intensity in recent years. However, high cost production of nanofluidic devices through the commonly used nanofabrication technologies and the incomplete understanding of solute confinement is still delaying the development of reliable, reproducible and affordable nanofluidic tools. The concentration of species and their diffusion dynamics are strongly influenced by the nanostructure architecture and surface chemistry. Testing a large number of known geometries and surface characteristics has not been possible due to limitations in fabrication procedures. Here, we try to overcome these fabrication difficulties by making the production of large scale nanofluidic devices more viable. We use an alternative bottom‐up method based on supramolecular self‐assembly and sol‐gel chemistry to produce and integrate controlled ceramic nanoporous Pillar Planar Nanochannels (PPN) within microfluidic devices. The system provides a way to easily analyze the diffusion and reaction of species in the aforementioned nanochannels. We show how to extract the nano‐confined concentration and diffusion speed without requiring any expensive analysis instrument. Subsequently, large data sets can be obtained due to the affordability of the presented nanostructure and the ease of its analysis. Moreover, since PPNs have a periodical and regular geometry the obtained data can be compared with simulations, allowing for a better description of the nanoconfined behavior of species.

show abstract

Adsorbate Screening of Surface Charge of Microscopic Ferroelectric Domains in Sol–Gel PbZr_0.2Ti_0.8O₃ Thin Films

Cited by 25 publications

References 32 publications

Piezo-catalysis for nondestructive tooth whitening

Piezo-catalysis for nondestructive tooth whitening

Interaction of low-energy electrons with surface polarity near ferroelastic domain boundaries

Ionic Diffusion, Nanoparticle Formation and Trapping Within Sol‐Gel Made Pillared Planar Nanochannels in a Simple Microfluidic Device

Contact Info

Product

Resources

About