Adhesion strength measurement of polymer dielectric interfaces using laser spallation technique

Kandula, Soma Sekhar V.; Hartfield, Cheryl; Geubelle, Philippe H.; Sottos, Nancy R.

doi:10.1016/j.tsf.2008.05.033

Cited by 45 publications

(31 citation statements)

References 23 publications

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“…A significant number of laser spallation studies incorporate images of film failure by stress wave loading [24][25][26][27][28][29]. The sequence of images indicates an increase in spall size with each increment in laser fluence, however, this trend has not been previously quantified.…”

Section: Scale Bar Is 1 MMmentioning

confidence: 99%

“…The spallation region varies based on the laser loading fluence (energy per unit area), and the coating composition or growth conditions. For example, several authors [25][26][27][28][29] report a larger spall size at higher fluences when compared with the same coating loaded at lower fluences, though no systematic study has been presented. It has also been qualitatively shown that a loaded film with low adhesion strength would result in a larger spall size than that of a high adhesion strength film loaded at the same fluence.…”

Section: Introductionmentioning

confidence: 99%

“…Laser spallation has been implemented to measure adhesion of various coatings including metallic [25,[30][31][32][33] and polymeric [27,29,34] films, by obtaining the stress that causes film failure. The use of laser spallation on biological films such as cells and bacteria is a relatively newer field [35][36][37], thus these methods must be carefully examined to determine the validity of the measurements.…”

Section: Introductionmentioning

confidence: 99%

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Biofilm rupture by laser-induced stress waves increases with loading amplitude, independent of location

Kearns

Boyd

Grady

2019

Preprint

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Integral to the production of safe and biocompatible medical devices is to determine the interfacial properties that affect or control strong biofilm adhesion. The laser spallation technique has recently emerged as an advantageous method to quantify biofilm adhesion across candidate biomedical surfaces. However, there is a possibility that membrane tension is a factor that contributes to the stress required to separate biofilm and substrate. In that case, the stress amplitude, controlled by laser fluence, that initiates biofilm rupture would vary systematically with location on the biofilm. Film rupture, also known as spallation, occurs when film material is ejected during stress wave loading. In order to determine effects of membrane tension, we present a protocol that measures spall size with increasing laser fluence (variable fluence) and with respect to distance from the biofilm centroid (iso-fluence). Streptococcus mutans biofilms on titanium substrates serves as our model system. A total of 185 biofilm loading locations are analyzed in this study.We demonstrate that biofilm spall size increases monotonically with laser fluence and apply our procedure to failure of non-biological films. In iso-fluence experiments, no correlation is found between biofilm spall size and loading location, thus providing evidence that membrane tension does not play a dominant role in biofilm adhesion measurements. We recommend our procedure as a straightforward method to determine membrane effects in the measurement of adhesion of biological films on substrate surfaces via the laser spallation technique.

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Section: Scale Bar Is 1 MMmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biofilm rupture by laser-induced stress waves increases with loading amplitude, independent of location

Kearns

Boyd

Grady

2019

Preprint

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“…or 400 nm thickness and a silicon wafer (Kandula et al, 2008b). Stress wave propagation in this multilayer system was analyzed analytically and numerically, by neglecting the influence of the silicon nitride layer in the analysis.…”

Section: Si/si X N Y /Pbo Systemmentioning

confidence: 99%

Laser-based Determination of Decohesion and Fracture Strength of Interfaces and Solids by Nonlinear Stress Pulses

Hess¹

2010

Acoustic Waves

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“…In microelectronic devices this layer also protects the underlying integrated circuit structure from moisture and contamination. Kandula et al (2008) have shown that a thin Si x N y layer does not influence the wave propagation, and in turn the state of stress at the film interface. They have also found that the substrate surface roughness significantly affects the thin film interfacial strength.…”

Section: Specimen Geometrymentioning

confidence: 99%

Mixed-mode interfacial adhesive strength of a thin film on an anisotropic substrate

Kitey

Geubelle

Sottos

2009

Journal of the Mechanics and Physics of Solids

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Adhesion strength measurement of polymer dielectric interfaces using laser spallation technique

Cited by 45 publications

References 23 publications

Biofilm rupture by laser-induced stress waves increases with loading amplitude, independent of location

Biofilm rupture by laser-induced stress waves increases with loading amplitude, independent of location

Laser-based Determination of Decohesion and Fracture Strength of Interfaces and Solids by Nonlinear Stress Pulses

Mixed-mode interfacial adhesive strength of a thin film on an anisotropic substrate

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