Water Vapor Sorption and Desorption by Human Callus I: Anomalous Diffusion

Wursterx, Dale E.; Yang, Kin-Hai

doi:10.1002/jps.2600711113

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…where aG is the thermal expansion coefficient of the glass substrate, and a SC is the thermal expansion coefficient of the SC. a G is $ 3 · 10 )6 per°C, whereas a SC is higher and on the order of 10 )4 per°C [38] similar to other biological tissues [39] and polymeric materials. Using our measured value of E SC $ 272 MPa and assuming m SC is $ 0.4, Dr sc is $ )0.4 MPa when the tissue is heated from 35 to 45°C and +0.4 MPa when cooled over the same range.…”

Section: Moisture and Temperature Effectsmentioning

confidence: 53%

“…Using thin‐film mechanics, the change in the SC stress, Δσ sc , resulting from thermal expansion mismatch between the substrate and the SC layer when the temperature is changed from T o to T is given by: where α G is the thermal expansion coefficient of the glass substrate, and α SC is the thermal expansion coefficient of the SC. α G is ∼ 3 × 10 −6 per °C, whereas α SC is higher and on the order of 10 −4 per °C [38] similar to other biological tissues [39] and polymeric materials. Using our measured value of E SC ∼ 272 MPa and assuming ν SC is ∼ 0.4, Δσ sc is ∼−0.4 MPa when the tissue is heated from 35 to 45°C and +0.4 MPa when cooled over the same range.…”

Section: Resultsmentioning

confidence: 98%

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Drying stress and damage processes in human stratum corneum

Levi

Weber

et al. 2010

Intern J of Cosmetic Sci

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The drying stresses that develop in stratum corneum (SC) are crucial for its mechanical and biophysical function, its cosmetic feel and appearance, and play a central role in processes of dry skin damage. However, quantitative methods to characterize these stresses are lacking and little understanding exists regarding the effects of drying environment, chemical exposures and moisturizing treatments. We describe the application of a substrate curvature technique adapted for biological tissue to accurately characterize SC drying stresses as a function of time following environmental pre-conditioning and chemical treatment in a range of drying environments. SC stresses were observed to increase to stress levels of up to approximately 3 MPa over periods of 8 h depending on pretreatment and drying environment. A unique relationship between the SC stress and water in the drying environment was established. The effect of glycerol on lowering SC stresses and damaging surfactants on elevating SC stresses were quantified. Extensions of the method to continuous monitoring of SC stresses in response to changes in environmental moisture content and temperature are reported. Finally, a biomechanics framework to account for the SC drying stress as a mechanical driving force for dry skin damage is presented.

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Section: Moisture and Temperature Effectsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 98%

Drying stress and damage processes in human stratum corneum

Levi

Weber

et al. 2010

Intern J of Cosmetic Sci

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An analysis on the rates and regulation of insensible water loss through the eccrine sweat glands

Jeje

Koon

1989

Journal of Theoretical Biology

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Buraphacheep

Wurster

1994

Pharmaceutical Research

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A variable long path gas cell was used to measure the sorption of organic vapors by a polymer slab. Unfilled polydimethylsiloxane (PDMS) slabs were cast and used to study the sorption of a series of aliphatic alcohols. The PDMS slab was suspended in the gas cell and exposed to low relative pressures of an alcohol vapor. The sorption rate of the alcohol vapor by the PDMS slab was obtained by measuring the decrease in the amount of free diffusant in the gas cell. The diffusion coefficients of the alcohols in the PDMS slab were then calculated from the curves of amount of diffusant sorbed versus time. The results show that the values of the diffusion coefficients at nearly infinite dilution, D0, for methanol, ethanol, 1-propanol, and 1-butanol are 1.01 x 10(-5), 0.61 x 10(-5), 0.54 x 10(-5), and 0.33 x 10(-5) cm2/sec, respectively. The isotherms for the sorption of the alcohols by the PDMS slab were also constructed from the data.

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Water Vapor Sorption and Desorption by Human Callus I: Anomalous Diffusion

Cited by 3 publications

References 25 publications

Drying stress and damage processes in human stratum corneum

Drying stress and damage processes in human stratum corneum

An analysis on the rates and regulation of insensible water loss through the eccrine sweat glands

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