Simple preparation and initial characterization of semi-amorphous hollow calcium silicate hydrate nanoparticles by ammonia-hydrothermal-template techniques
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Semi-amorphous hollow calcium silicate hydrate nanoparticles (CS10d120Hac) were successfully synthesized via simple ammonia-hydrothermal-template approach (AHT) followed by acid treatment. Results revealed that the newly synthesized samples had homogenous hollow nano-interior wherein the shell wall contained semi-amorphous calcium silicate hydrate. The AHT intensified the formation of a stronger electrostatic interaction (Si–O–Ca) from the weaker electrostatic contact composed of silicate wall-calcium hydroxide interaction (Si–OH–Ca) forming a thin semi-amorphous calcium silicate hydrate shell wall. This is also a convenient way for structural stability of the hollow CS10d120Hac. The CS10d120Hac showed a relatively higher surface area, which is uniquely rare especially if compared with bulk calcium silicate particles. This CS10d120Hac can be selectively functionalized with multiple organic and inorganic groups. Hence, this work may open a new route for the formation of hybrid hollow bio-active particles.
KeywordsCalcium silicate hydrate Hollow nanoparticles Colloidal Hydrothermal-template synthesis
The authors gratefully acknowledge that this research was partially supported by the Japanese Government Ministry of Education, Culture, Sports, Science and Technology (MEXT; Monbukagakusho Scholarship) and Grant-in-Aid for Scientific Research 22310066 (2010–2012). We are also thankful to C.C. Chua-Nakar (Reviewer-Inorganic Chemistry, Ramon Sison Review Center) for the useful technical discussion and assistance with this study.
Conflict of interest
The author declares that they have no competing interest.
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