Additions of single-walled carbon nanotubes (SWCNTs) to kappa-carrageenan gels weaken thixotropy. The minimum volume fraction of SWCNT to kappa-carrageenan necessary to affect thixotropy is about 10(-4). Confocal Raman microscopy reveals that SWCNTs are preferentially located close to the hole perimeter native to the gel network. This suggests that the destruction of network initiates at the hole perimeter. By locating at the critical region, only a small amount of SWCNTs is sufficient to resist initiating destruction.