A template-directed and surface-modified method for the facile synthesis of polypyrrole (PPy) or polyaniline (PAni) hollow spheres having smooth surface, uniform wall thickness, and a range of controllable sizes is developed. The use of these biocompatible hollow spheres as a new class of contrast agents for sonography (see image) is also demonstrated.
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Bai et al. (2009) studied this question.
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