Aggregation and Stabilization of Carboxylic Acid Functionalized Halloysite Nanotubes (HNT-COOH)
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- 作者：Yongho Joo ; Yangjun Jeon ; Sang Uck Lee ; Jae Hyun Sim ; Jungju Ryu ; Sungyoung Lee ; Hoik Lee ; Daewon Sohn
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：August 30, 2012
- 年：2012
- 卷：116
- 期：34
- 页码：18230-18235
- 全文大小：539K
- 年卷期：v.116,no.34(August 30, 2012)
- ISSN：1932-7455
文摘
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 solution; however, the material was dispersed in basic and acidic solutions. This occurrence is due to hydrogen bonds (HB) between the carboxyl groups of HNT-COOH in neutral solution, which decrease in acidic and basic solution due to charge dispersion.