Projekteja vuodessa
Abstrakti
This article presents measurements of the permittivity of gelatin hydrogels between 220 and 330 GHz. Hydrated gelatin was treated as a binary mixture of free water and a compound consisting of water bound to collagen. Submillimeter-wave reflectometry was used to estimate the hydrated gelatin permittivity, hydrated gelatin density, and free-water volume fraction in phantoms composed of 62, 67, 72, and 77% water by weight. A hydrated dry/wet density ratio of 0.335 was validated with optical-coherence tomography. A constant nonfreezing bound-water mass of 0.6 g/g was observed and confirmed with differential-scanning calorimetry. Good agreement between results from different modalities supports the dielectric spectroscopy methods and data analysis. Depending on the hydrodynamics at the sample/air interface, measurements indicate a bound-water compound permittivity of 3.77-j2.52 to 3.95-j2.49 - contrasting the pure-water average permittivity of 5.16-j5.63. The loss related to bound water was much higher than anticipated and characterization will help reduce uncertainty in measurements of gelatin hydrogel-based tissue phantoms; particularly corneal phantoms where adjacent free water creates complex hydration gradients. This is the first known, submillimeter-wave, frequency domain measurement of complex permittivity of the bound-water component in solid, proteinaceous matter.
Alkuperäiskieli | Englanti |
---|---|
Artikkeli | 9451620 |
Sivut | 538-547 |
Sivumäärä | 10 |
Julkaisu | IEEE Transactions on Terahertz Science and Technology |
Vuosikerta | 11 |
Numero | 5 |
DOI - pysyväislinkit | |
Tila | Julkaistu - syysk. 2021 |
OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Sormenjälki
Sukella tutkimusaiheisiin 'Submillimeter-Wave Permittivity Measurements of Bound Water in Collagen Hydrogels via Frequency Domain Spectroscopy'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 1 Päättynyt
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AGRUM: Assessment of the Graft Rejection Using Millimeter Waves
Taylor, Z. (Vastuullinen tutkija), Tamminen, A. (Projektin jäsen), Ala-Laurinaho, J. (Projektin jäsen), Masyukov, M. (Projektin jäsen), Baggio, M. (Projektin jäsen), Vaynshteyn, S. (Projektin jäsen), Lamberg, J. (Projektin jäsen), Grigorev, R. (Projektin jäsen), Nefedova, I. (Projektin jäsen), Rezapoor, P. (Projektin jäsen) & Kiviharju, P. (Projektin jäsen)
01/01/2020 → 31/12/2022
Projekti: Academy of Finland: Other research funding