| 摘要 |
A wick-based delivery system includes a container (1) for holding a liquid, and a porous wick (3a, 3b), having a first section (3a) of a material with a pore size of a predetermined size and a second section (3b) of a material of a predetermined pore size that is greater than that of the material of the fir st section. The porous wick extends through an opening (5) in the container so that when the liquid is added to the container, a lower region (3b) of the porous wick is in contact with the liquid, and an upper region (3a, 3b) of t he porous wick is exposed to the ambient air. In one embodiment, at least a portion of the first section (3a) and at least a portion of the second secti on (3b) are exposed to the ambient air. In another embodiment, only the second section (3b) is exposed to the ambient air.
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