Temperature-controlled reversible exfoliation-stacking of titanate nanosheets in an aqueous solution containing tetraalkylammonium ions

Abstract

Exfoliation and stacking of titanate nanosheets dispersed in aqueous solutions containing tetraalkylammonium ions can be reversibly controlled by adjusting the solution temperature as a tunable physical parameter. That is, the transparent colloidal solution of exfoliated titanates is clouded on the basis of spontaneous staking of multiple nanosheets when heated at a certain temperature, and cooling of the clouded solution causes regeneration of the original exfoliated state. This cycle repeatedly and rapidly occurs according to the temperature fluctuation. The origin of behavior is qualitatively interpreted with a temperature-dependent variation in the Debye screening length of negatively charged nanosheets that affects the dispersibility of nanosheets.

Intense emissions from photoproteins interacting with titanate nanosheets

“…Our previous paper demonstrated that the crystal structure of TNS produced by the hydrolysis of TTIP is akin to the tetratitanate (Ti 4 O 9 2À ). 19 In addition, The diffraction line assigned to the (200) plane of tetratitanate intercalated with TBA + counter ions appeared in the XRD pattern of the solid aer drying the colloidal solution (Fig. 1b).…”

Enhanced catalytic activity of enzymes interacting with nanometric titanate nanosheets

“…1b. According to literatures, 24,25 the colloidal particles prepared by the present hydrolysis technique have a crystal structure consisting of tetratitanate (Ti 4 O 9…”

Enzyme-Mimetic Activity of Ce-Intercalated Titanate Nanosheets

“…Solid components in the solution had tiny dimensions less than 10 nm with a narrow distribution, and a mean hydrodynamic diameter gradually increased with increasing Ce content (Figure 1b). Our previous papers demonstrated that the crystal structure of TNS produced by the hydrolysis of TTIP is akin to tetratitanate (Ti 4 O 9 2− ) 21 and that the colloidal particle seems to be a tiny stack assembled with several nanosheets (average stack number <5). 22 In fact, the diffraction line assigned to (200) plane of tetratitanate intercalated with bulky TBA + counterions appeared in the XRD pattern of solid after drying the colloidal solutions irrespective of Ce content (Figure 2).…”