Preparation of nanometer-sized hollow particles by photochemical degradation of polysilane shell cross-linked micelles and reversible encapsulation of guest molecules

Macromolecules

Volumn 33, Issue 23, 2000, Pages 8524-8526

  Sanji, Takanobu ^a   Nakatsuka, Yuriko ^a   Ohnishi, Satomi ^b   Sakurai, Hideki ^a  

^a TOKYO UNIVERSITY OF SCIENCE   (Japan)

^b NATL INST OF MAT AND CHEM RES   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ACRYLICS; BLOCK COPOLYMERS; CROSSLINKING; ENCAPSULATION; MICELLES; MOLECULAR STRUCTURE; PARTICLES (PARTICULATE MATTER); PHOTOLYSIS; POLYSILANES; REACTION KINETICS; SYNTHESIS (CHEMICAL);

NANOCAGES; POLYMETHACRYLIC ACID;

NANOSTRUCTURED MATERIALS;

EID: 0034317974     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0011892     Document Type: Article

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35. A solution of the shell cross-linked micelles (47 mg) in water (10 mL) was irradiated for several minutes with a 500 W high-pressure mercury lamp equipped with selected cutoff filters (hv ≥ 280 nm). After evaporating the solvent, the residual mass was washed with benzene and then transferred to a dialysis bag followed by dialysis against distilled water for 2 days. A sample of hollow particles was obtained after drying under vacuum (43 mg, 90%).
36. Photodegradation of the polysilane core part gave linear oligosilanes with the chain length less than eight under the condition, while the final length of the oligosilane chain depends on the wavelength of the light used. Strictly speaking, the oligosilane may attach to the chain end of cross-linked poly(methacrylic acid) in the interior side of the layer.
37. -1.
38. Samples for AFM measurement were prepared by dipping a Pyrex glass plate, which was treated with hexamethyldisilazane, to solution of the hollow particles in THF (0.029 mg/mL) and allowing it to dry in air.