๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Investigations of the role of cavitation in low-frequency sonophoresis using acoustic spectroscopy

โœ Scribed by Ahmet Tezel; Ashley Sens; Samir Mitragotri

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
168 KB
Volume
91
Category
Article
ISSN
0022-3549

No coin nor oath required. For personal study only.

โœฆ Synopsis

Application of low-frequency ultrasound signiยฎcantly enhances skin permeability. The enhancement of skin permeability is mediated by cavitation, oscillation, and collapse of gaseous cavities. In this article, we report detailed investigations of the occurrence of cavitation during low-frequency sonophoresis. Cavitation was monitored by recording pressure amplitudes of subharmonic emission and broadband noise at four different ultrasound frequencies in the range of 20ยฑ100 kHz and at various intensities in the range of 0ยฑ2.6 W/cm 2 . Enhancement of skin conductivity, in the presence of sodium lauryl sulfate (SLS), was also measured under the same ultrasound conditions. Enhancement of skin conductivity correlated well with the amplitude of broadband noise, which suggests the role of transient cavitation in low-frequency sonophoresis. No correlation was found between the subharmonic pressure amplitude and conductivity enhancement.

๐Ÿ“œ SIMILAR VOLUMES

Experimental demonstration of the existe
Experimental demonstration of the existence of highly permeable localized transport regions in low-frequency sonophoresis
โœ Joseph Kushner IV; Daniel Blankschtein; Robert Langer ๐Ÿ“‚ Article ๐Ÿ“… 2004 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 257 KB

Recent advances in low-frequency sonophoresis have focused on the existence of hypothesized localized transport regions (LTRs). However, there has been no actual experimental demonstration that the hypothesized LTRs are, in fact, localized regions of high permeability. Through a series of low-freque

Low-frequency assessment of the in situ
Low-frequency assessment of the in situ acoustic absorption of materials in rooms: an inverse problem approach using evolutionary optimization
โœ Guillaume Dutilleux; Franck C. Sgard; Ulf R. Kristiansen ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 167 KB

## Abstract The __in situ__ assessment of the acoustic absorption of materials is often a necessity. The need to cover the whole frequency range of interest for the building engineer has led the authors to an approach involving two frequencyโ€complementary measurement methods. This paper deals with

Low-Frequency Relaxation Phenomena in ฮฑ-
Low-Frequency Relaxation Phenomena in ฮฑ-LiIO3: The Nature and Role of Defects
โœ Y. Mugnier; C. Galez; J.M. Crettez; P. Bourson; C. Opagiste; J. Bouillot ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 272 KB

The lithium iodate ionic conduction in the polar c-axis direction is studied between 35 and 470 K for crystals grown in various conditions. So far, to separate processes induced by the nature of electrodes, the impedance spectroscopy technique had been used at room temperature with both metallic and

The role of higher energy bands in hot c
The role of higher energy bands in hot carrier transport investigated by electroluminescence spectroscopy
โœ J.W. Cockburn; J.J. Finley; M.S. Skolnick; P. Wisniewski; R. Teissier; R. Grey; ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 78 KB

We report the use of high sensitivity electroluminescence (EL) techniques to study intervalley scattering processes in single barrier p-i-n GaAs/AlGaAs/GaAs heterostructures. The EL experiments provide spectroscopic information on the nature of the intervalley scattering mechanisms and on their rel