• 제목/요약/키워드: Thermochromic ingredients

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과열감지용 열변색 겔성형체의 특성 평가 (Properties Evaluation of Thermochromic Gel Compounds for Detecting Overheating)

  • 김정훈;조명호;강영구
    • 한국화재소방학회논문지
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    • 제22권5호
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    • pp.61-66
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    • 2008
  • 본 연구에서는 특정물질의 과열로 인한 이상 상태를 조기에 감지하여 화재 및 폭발로의 전이 위험성을 사전에 예방할 수 있는 방법 중 하나로 열변색 색소를 유효성분으로 한 겔성형체를 제조하여 그 특성을 평가하였다. 또한 과열감지용 대상물에 대한 적용성을 확대하기 위하여 성형체는 원료물질의 종류와 함량, 그리고 제조방법에 따라 점탄성형과 도포형의 2가지로 제조하였다. 변색성 시험, 점도 특성, 변색 개시시간, FT-IR 분석을 수행한 결과 이상 조건을 효과적으로 감지하여 변색 기능을 나타낼 수 있는 물질이 제조되어 다양한 응용이 가능할 것으로 사료된다.

Skin-Mimicking Phantom for Measurment of Cosmetic Transdermal Absorption and Temperature Changes by Sonophoresis

  • Kim, Gahee;Jang, Hwijin;Choi, Seonmin;Park, Sanghyo;Kim, Woo Cheol;Key, Jaehong
    • 대한의용생체공학회:의공학회지
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    • 제43권4호
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    • pp.271-279
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    • 2022
  • Functional cosmetics containing various ingredients that improve skin health are currently being developed. In addition, technologies that help increase the absorption rate of such cosmetics have recently gained significant attention. Sonophoresis is a method to increase the transdermal absorption of cosmetics using ultrasound. A skin-mimicking phantom was fabricated using polydimethylsiloxane, Strat-MTM membrane, and thermochromic pigments. Gel-type cosmetics used in skin mask packs and epidermal-growth-factor-based nano-cosmetics were tested for their absorption rates at ultrasound frequencies of 1, 3, and 10 MHz in the single frequency mode, and 1/3 and 3/10 MHz in the dual frequency mode. The gel-type cosmetics and epidermal-grow-factor-based nano-cosmetics showed the highest absorption rate at 3/10MHz dual frequency. The size of the cosmetic particles decreased by 5-9 %. Furthermore, the temperature rise caused by ultrasound could be visually recognized by the thermochromic pigment in the phantom turning white. We presented a skin-mimicking phantom. The device can be customized according to the size of the ultrasound probe and has the advantage of quantitatively evaluating the transdermal permeability of cosmetics at a low cost. The development of the skin-mimicking phantom will be useful for determining the suitable conditions required to increase the absorption rate of cosmetics using ultrasound.