For example, titanium dioxide (a naturally occurring mineral often used as a pigment or thickener) is considered to be safe when put into a viscous mixture, such as in sunscreen or toothpaste.

例如，二氧化钛（一种天然矿物，可用做着色剂或粘稠剂）在粘稠状混合物中是安全的，如防晒露或牙膏。

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Titanium dioxide has unique characteristics, such as the surface hydroxy groups involved, wetting properties, surface acidity or basicity, surface electrical properties and photochemical activity.

二氧化钛具有表面羟基、润湿性、表面酸碱性、表面电性、光化学活性等表面物理化学性质。

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Mesoporous titanium dioxide have shown potential applications in wide fields such as catalysis, adsorption, separation and so on.

介孔二氧化钛特殊的结构和性能，使其在催化、 吸附、分离等领域展现出广阔的应用前景。

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He held eight meetings with entrepreneurs trying to build companies around nanopowdered materials such as titanium dioxide--and then was flooded with 30 similar proposals, all of which he tossed.

FORBES: Mr. Nanotech