Novel macroscopic self-organization in polymer gels

Fully reversible macroscopic self-organization is observed in polymeric gel s based on acryloyl derivatives of amino acids. Only certain gels, which ha ve a critical balance of hydrophilic and hydrophobic groups in their chemic al structure, demonstrate the self-organization from solid cylinder to holl ow sphere (see Figure). These gels can be used in novel applications such a s the controlled release of drugs and chemicals.