Development of a novel UV indicator and dosimeter film.
Development of a novel UV indicator and dosimeter film.
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开发新型紫外线指示剂和剂量计薄膜。
DOI：
10.1039/b502969d
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Sheridan
中科院分区：
文献类型：
--
作者：
A. Mills;Soo;M. Sheridan
描述了一种新型UV指示剂，其包含分散在聚合物羟乙基纤维素（HEC）膜中的二氧化钛纳米晶体颗粒，所述聚合物羟乙基纤维素（HEC）膜包含：温和还原剂三乙醇胺（TEOA）和氧化还原指示剂亚甲蓝（MB）。UV指示剂膜在没有UV光的情况下是蓝色的，并且在暴露于UV光时失去颜色，在几分钟内达到稳定状态的漂白程度，其可以提供入射光的辐照度的测量。一旦紫外线光源被移除，膜的原始蓝色就会恢复。讨论了典型紫外指示膜的光谱特性及其组分，并着重讨论了二氧化钛颗粒的紫外吸收作用。从典型的UV指示剂所经历的作为光辐照度的函数的所测量的漂白%，指示剂在7分钟内通过3 mW cm（-2）或更大的UV辐照度表现出完全漂白。介绍了紫外指示剂的工作机理。UV指示剂的可逆性质通过用薄的、基本上不透氧的聚合物膜（例如在透明胶带中发现的再生纤维素）覆盖典型的UV指示剂来去除。该产品是一种紫外线剂量计，其响应与入射紫外线的强度和持续时间以及薄膜中二氧化钛的含量有关。典型的UV剂量计膜被250 mJ cm（-2）的UV光完全漂白。可能使用这些新的指标来衡量紫外线照射水平，辐照度和剂量，进行了讨论。
A novel UV indicator is described, comprising nanocrystalline particles of titania dispersed in a film of a polymer, hydroxyl ethyl cellulose (HEC), containing: a mild reducing agent, triethanolamine (TEOA) and a redox indicator, methylene blue (MB). The UV indicator film is blue-coloured in the absence of UV light and loses colour upon exposure to UV light, attaining within a few min a steady-state degree of bleaching that can provide a measure of the irradiance of the incident light. The original blue colour of the film returns once the source of UV light is removed. The spectral characteristics of a typical UV indicator film, and its components, are discussed and the UV-absorbing action of the titania particles highlighted. From the measured %bleaching undergone by a typical UV indicator as a function of light irradiance the indicator appears fully bleached, within 7 min, by a UV irradiance of 3 mW cm(-2) or greater. The mechanism by which the UV indicator works is described. The reversible nature of the UV indicator is removed by covering a typical UV indicator with a thin, largely oxygen impermeable, polymer film, such as the regenerated cellulose found in Sellotape. The product is a UV dosimeter, the response of which is related to the intensity and duration of the incident UV light, as well as the amount of titania in the film. A typical UV dosimeter film is fully bleached by 250 mJ cm(-2) of UV light. The possible use of these novel indicators to measure UV exposure levels, irradiance and dose, is discussed.