✦ LIBER ✦

Reversible pH-Dependent Properties of Multilayer Microcapsules Made of Weak Polyelectrolytes

✍ Scribed by Tatjana Mauser; Christophe Déjugnat; Gleb B. Sukhorukov

Publisher: John Wiley and Sons
Year: 2004
Tongue: English
Weight: 152 KB
Volume: 25
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.200400331

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Summary: We investigated microcapsules composed of the weak polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(methacrylic acid) (PMA) assembled on calcium carbonate cores. These capsules are stable in the pH range from 2.5 to 11.5, undergoing reversible swelling in the pH interval from 2.7 to 2.6. Capsule swelling occurs at a protonation degree above 90%. The pH‐dependent size variation of PAH/PMA capsules is blocked after crosslinking of the polyelectrolyte layers.

Schematic of the swelling and de‐swelling of the capsules with changing pH.

imageSchematic of the swelling and de‐swelling of the capsules with changing pH.

📜 SIMILAR VOLUMES

Preparation and Unique pH-Responsive Pro

Preparation and Unique pH-Responsive Properties of Novel Biodegradable Nanocapsules Composed of Poly(γ-glutamic acid) and Chitosan as Weak Polyelectrolytes

✍ Takayuki Imoto; Toshiyuki Kida; Michiya Matsusaki; Mitsuru Akashi 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 419 KB

## Abstract Novel biodegradable hollow nanocapsules composed of two kinds of weak polyelecrolytes, CT and γ‐PGA, were successfully prepared by the deposition of their LbL‐assembled films onto silica particles and the subsequent removal of the silica. These CT‐γ‐PGA hollow nanocapsules showed unique