la7b03536_si_001.pdf (3.36 MB)
Synthesis of Hollow Doughnut Shape Mesoporous Silica Nanoparticle: A Case of Self-Assembly Composite Templates
journal contributionposted on 2018-03-13, 00:00 authored by Nhat Tri Vo, Astam K. Patra, Dukjoon Kim
The new class of silica nanoparticles with unprecedented structural morphology is synthesized by hydrolysis of tetraethyl orthosilicate (TEOS) in the presence of cetyltrimethylammonium bromide (CTAB), l-arginine, and ammonium metatungstate (AMT) composite template, all in aqueous ethanol. The morphology of the synthesized mesoporous silica nanoparticles (MSNs) can be tuned from a spherical to a hollow doughnut shape through a hollow sphere by controlling the concentration of AMT in the composite template. The formation mechanism of the hollow doughnut shaped MSNs (hd-MSNs) is well-explored by means of zeta potential, high-resolution transmission electron microscopy (HRTEM) with elemental mapping analysis, and X-ray photoelectron spectroscopy. The unique structure of the hd-MSNs as well as their high thermal and mechanical stability is expected to result in their application in shape-selective catalysis, drug-delivery, and sensors.
hd-MSNCTABcetyltrimethylammonium bromidepresenceshape-selective catalysisl-arginineammonium metatungstatestabilityMSNmorphologyconcentrationsilica nanoparticleswell-exploredapplicationtemplateHollow Doughnut Shape Mesoporous Silica NanoparticlesensorAMTSynthesiformation mechanismmesoporous silica nanoparticlesX-ray photoelectron spectroscopymapping analysistetraethyl orthosilicateethanolzetaHRTEMSelf-Assembly Composite Templatestransmission electron microscopyTEOSdoughnut shapehydrolysis