Effect of the gel elasticity of model skin matrices on the distance/depth-dependent transmission of vibration energy supplied from a cosmetic vibrator.
OBJECTIVE
The purpose of this study was to determine how the energies supplied from a cosmetic vibrator are deeply or far transferred into organs and tissues, and how these depths or distances are influenced by tissue elasticity.


METHODS
External vibration energy was applied to model skin surfaces through a facial cleansing vibrator, and we measured a distance- and depth-dependent energy that was transferred to model skin matrices. As model skin matrices, we synthesized hard and soft poly(dimethylsiloxane) (PDMS) gels, as well as hydrogels with a modulus of 2.63 MPa, 0.33 MPa and 21 kPa, respectively, mostly representing those of skin and other organs. The transfer of vibration energy was measured either by increasing the separation distances or by increasing the depth from the vibrator.


RESULTS
The energies were transmitted deeper into the hard PDMS than into the soft PDMS and hydrogel matrices. This finding implies that the vibration forces influence a larger area of the gel matrices when the gels are more elastic (or rigid). There were no appreciable differences between the soft PDMS and hydrogel matrices. However, the absorbed energies were more concentrated in the area closest to the vibrator with decreasing elasticity of the matrix. Softer materials absorbed most of the supplied energy around the point of the vibrator. In contrast, harder materials scattered the external energy over a broad area.


CONCLUSIONS
The current results are the first report in estimating how the external energy is deeply or distantly transferred into a model skins depending on the elastic moduli of the models skins. In doing so, the results would be potentially useful in predicting the health of cells, tissues and organs exposed to various stimuli.
Department of Chemical Engineering, Hanyang University, Seoul, 04763, South Korea.
M K
MK
Jeong
Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea.
C
C
Hwang
Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea.
H
H
Nam
Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea.
Y S
YS
Cho
Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea.
B Y
BY
Kang
Department of Chemical Engineering, Hanyang University, Seoul, 04763, South Korea.
E C
EC
Cho
D003358:Cosmetics; D004548:Elasticity; D006801:Humans; D008954:Models, Biological; D012867:Skin; D014732:Vibration
D003358:Cosmetics
distance- and depth-dependent vibration energy transfer/absorption; elasticity of model skins; polymers; safety testing; skin physiology/structure