Dae Won Son

Metal complexation-based gelation imparts load-bearing hydrogels with striking properties like reversibility, self-healing, and mechanical tunability. Using a bio-inspired metal–catechol complex, these properties have been introduced to a variety of polymer hydrogels, except hyaluronic acid, which is widely used in biological applications. In this research, we developed two different hyaluronic acid (HA) hydrogels by regulating the gelation kinetics of Fe 3+ and a catechol cross-linker, includin

We modified the functional groups of holloysite nanotubes (HNT) from hydroxyl groups (HNT-OH) to carboxylic acids (HNT-COOH). Aggregation and dispersion properties of HNT-COOH under dry conditions were probed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Moreover, the degree of aggregation and dispersion of HNT-COOH in acidic, basic, and neutral solutions were measured by multiple angle polarized dynamic light scattering (MA-DLS). HNT-COOH formed aggregates in neutral

Aggregation and dispersion behaviours of halloysite nanotubes (HNTs) were influenced by pH. The meso- and micro-porosity of halloysite were determined by N2 gas physisorption. The blocking and opening of halloysite nanotube pores with acid, neutral, and base treatment were detected in a micro- and mesoporous matrix of tunable porosity. The inner pores of HNTs were opened with base treatment, but were closed with acid or neutral treatment.

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSize Control of Polyaniline Nanoparticle by Polymer SurfactantDeokgeun Kim, Jinwoo Choi, Jin-Yeol Kim, Yang-Kyoo Han, and Daewon SohnView Author Information Department of Chemistry, Hanyang University, 17 Haengdang Dong, Sungdong Ku, Seoul 133-791, Korea Cite this: Macromolecules 2002, 35, 13, 5314–5316Publication Date (Web):May 24, 2002Publication History Received31 January 2002Revised16 April 2002Published online24 May 2002Published inissue 1 June 2002h

The present work focuses on enhancing the anti-corrosive performance of multi-functional PU coatings by encapsulation of the commercial inhibitors 2-mercaptobenzimidazole & 2-mercapatobenzothiozole, despite their reaction with diisocyanate.