Deformation of colloidal silica particles using MeV Si ion irradiation

Cheang-Wong, J.C.; Morales, Ulises; Reséndiz, Eder; Oliver, A.; Rodrı́guez-Fernández, L.

doi:10.1016/j.jnoncrysol.2007.01.056

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…As mentioned, most of the studies have focused on silica particles irradiated with different types of ions impinging with an energy such that electronic stopping power is dominant and usually with an incidence angle of the ion beam θ ion = 45 • . The effect of several parameters has been considered, for instance of the ion fluence or areal density N I (i.e., the number of ions impinging on the target material per unit area) [14,15,[23][24][25], electronic energy loss controlled either via the ion energy E for the same ion or via the type of ion at the same energy E [14][15][16]24,26,27], angle of incidence [25], temperature [24,28] and particle size [14,23,29]. Generally speaking, when all the other conditions are the same, deformation increases with S e and with fluence, while it decreases with temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In previous works, the quantitative characterization of the deformation has been performed by evaluating transverse and longitudinal axes with scanning electron microscopy (SEM). The biaxial expansion in the plane perpendicular to the ion beam direction and the uniaxial contraction along the direction of the ion beam can be estimated by properly choosing the angle of observation of the deformed particles with respect to the angle of irradiation during SEM measurements [14][15][16]23,[25][26][27][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation

et al. 2020

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Self-assembly of colloidal monolayers represents a prominent approach to the fabrication of nanostructures. The modification of the shape of colloidal particles is essential in order to enrich the variety of attainable patterns which would be limited by the typical assembly of spherical particles in a hexagonal arrangement. Polymer particles are particularly promising in this sense. In this article, we investigate the deformation of closely-packed polystyrene particles under MeV oxygen ion irradiation at normal incidence using atomic force microscopy (AFM). By developing a procedure based on the fitting of particle topography with quadrics, we reveal a scenario of deformation more complex than the one observed in previous studies for silica particles, where several phenomena, including ion hammering, sputtering, chemical modifications, can intervene in determining the final shape due to the specific irradiation conditions. In particular, deformation into an ellipsoidal shape is accompanied by shrinkage and polymer redistribution with the presence of necks between particles for increasing ion fluence. In addition to casting light on particle irradiation in a regime not yet explored, we present an effective method for the characterization of the colloidal particle morphology which can be applied to describe and understand particle deformation in other regimes of irradiation or with different techniques.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation

et al. 2020

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“…This ionbeam induced anisotropic deformation of amorphous materials such as silica has been reported in the case of SiO 2 films on Si substrates [2,3], as well as in colloidal silica particles [4,5]. Ion irradiation induces damage and structural changes in solids due to energy losses of multi-MeV heavy ions via ionization events and atomic collisions occurring in the near-surface region of the irradiated sample.…”

Section: Introductionmentioning

confidence: 63%

Shape deformation of colloidal titania nanoparticles by means of ion irradiation

Cheang-Wong

Díaz-Fonseca

2008

MRS Proc.

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Spherical submicrometer-sized titanium dioxide (TiO 2 or titania) particles were prepared by the sol-gel method from hydrolysis and condensation of titanium butoxide Ti(OC 4 H 9 ) 4 using ammonia as a catalyst in ethanol/acetonitrile and annealing in air at 100ºC. Subsequently, they were deposited onto silicon substrates, in order to form a monolayer of TiO 2 particles. Then these samples were irradiated at room temperature with Si 2+ ions at 4, 6 and 8 MeV, with fluences in the 2×10 14 -2×10 15 Si/cm 2 range, under an angle of 45° with respect to the sample surface. The titania particles were characterized by scanning electron microscopy to determine their size and shape before and after the ion irradiation. After the Si irradiation the spherical titania particles turned into ellipsoidal particles, as a result of the increase of the particle dimension perpendicular to the ion beam and the decrease in the direction parallel to the ion beam. This deformation effect increases monotonically with the ion fluence, and depends on the electronic energy loss of the impinging ion.

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“…In the case of spherical colloidal silica particles, ion irradiation turns them into oblate particles, as a result of the increase of the particle dimension perpendicular to the ion beam and the decrease in the parallel direction. Our previous works on this kind of samples showed that this anisotropic shape deformation increases with the ion fluence and with the silica particle size [4], and it depends on the impinging ion, the ion energy and the irradiation temperature in a way that merits further detailed studies [6,7]. Moreover, the mechanical or elastic properties of these structures are poorly studied.…”

Section: Introductionmentioning

confidence: 93%

“…Ion irradiation is a widely used technique to modify the structure and composition of materials. It is well known that MeV ion-irradiated silica particles can undergo extreme deformations [3,4]. The ion-induced shape deformation has been described in terms of the ion hammering theory, in which an amorphous material undergoes a shape modification when bombarded with fast heavy ions [5].…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic Studies of Colloidal Silica Particles after MeV Ion-Induced Shape Deformation

Morales¹,

Castañeda-Guzmán²,

Pérez‐Ruiz³

et al. 2011

NJGC

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Ordered arrays of colloidal submicrometer-sized silica particles deposited onto silicon wafers were irradiated with MeV Si ions. The spherical silica particles turned into oblate particles as a result of the increase of the particle dimension perpendicular to the ion beam direction and the decrease in the parallel direction. Pulsed laser photoacoustic spectroscopy was used to study the structural changes of the silica particles after the ion-induced shape deformation. Our purpose is to correlate the mechanical vibrations generated by the pulsed laser as a function of the Si irradiation parameters: ion energy and fluence. Fast Fourier transform analysis of the photoacoustic signal was carried out in order to obtain the normal vibration modes of the system. The size, size distribution and shape of the silica particles were determined by scanning electron microscopy. Our results revealed significant structural differences between the spherical and the deformed silica particles

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Deformation of colloidal silica particles using MeV Si ion irradiation

Cited by 7 publications

References 11 publications

Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation

Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation

Shape deformation of colloidal titania nanoparticles by means of ion irradiation

Photoacoustic Studies of Colloidal Silica Particles after MeV Ion-Induced Shape Deformation

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