Hollow Spheres Based on Mesostructured Lead Titanate with Amorphous Framework

Abstract

Hollow spheres of mesostructured lead titanate, denoted as PTM-1, have been prepared via a combined oil-in-water emulsion mediated and neutral amine supermolecular templated route. The variety of reaction temperatures and KOH concentrations indicates hollow spheres can be formed under a very critical condition. The structure and composition of the as-synthesized PTM-1 have been determined by powder X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), CHN (carbon-hydrogen-nitrogen) elemental analysis, and thermal analysis. Chemical extraction of organic templates by a cosolvent of weak acid and alcohol has resulted in the formation of a new mesoporous material of non-silica oxide with high porosity.

Tailoring the shape of amorphous nanomaterials: recent developments and applications

“…Spherical structure is also favorable in terms of surface energy. Nanospheres are the most reported shape of amorphous materials in the last decade (see Table 1), and they can be composed of calcium carbonate (CaCO 3 ) [43][44][45][46][47], silicon (Si) [48][49][50][51][52], metals or their compounds [53][54][55][56][57][58][59][60][61]. CaCO 3 is abundant in the natural world, and a typical model system used to mimic the mineralization process of biominerals [43].…”

“…Apart from the common amorphous nanospheres composed of CaCO 3 and Si, and amorphous nanospheres of some other compounds, such as Se [53], TiO 2 [54][55][56][57], Co-B alloy [58], FePO 4 [60] and zinc citrate [61], have also been prepared, generally by facile solution routes. Recently, Kuai et al [59] reported an interesting aerosol-spray-as- …”

“…Because of their complex internal structure, the growth of amorphous nanomaterial is usually ruleless, resulting in irregular particles using solution approaches or thin films using deposition techniques as their conventional shape. Over the last decade, inorganic amorphous nanomaterials with a variety of novel shapes, with notable examples including spheres, wires, tubes, fibers, cubes, octahedra, polyhedra, flower-like spheres and arrays, which are summarized in spheres (hollow) CaCO 3 gas-diffusion solution method [43] spheres CaCO 3 solution method [44] spheres CaCO 3 solution method [45] spheres CaCO 3 solution method [46] spheres CaCO 3 solution method [47] spheres Si thermal decomposition [48] spheres Si solution method [49] spheres Si/Ti solution method [50] spheres Si:H thermal decomposition [51] spheres Si:H thermal decomposition [52] spheres Se solution method [53] spheres TiO 2 solution method [54][55][56] spheres (hollow) PbO-TiO 2 sol-gel method [57] spheres Co-B alloy solution method [58] spheres 2 solution method [80] nanoboxes Ni(OH) 2 solution method [81] nanocubes (hollow) Co(OH) 2 solution method [82] nanopolyhedra (hollow) CoS solution method [83] mesopores nanocubes ZnSnO 3 solution method and annealing [84] REVIEWS SCIENCE CHINA Materials Table 1, have been synthesized. In this review, we explain how these exquisite nanostructures can be obtained by a number of innovative methods.…”

Synthesis and Applications of Hollow Particles

“…The resultant structures, which are called "colloidosome" , are hollow, elastic shells whose permeability and elasticity can be precisely controlled. M. M. Wu and co-workers 63) reported to prepare .…”

Sacrificial functional polystyrene core template to fabricate cross-linked chitosan microcapsules

“…Then the template is removed to form a cavity, leading to a hollow sphere structure [11,12]. The hollow spheres are generally fabricated by inorganic material of silica or non-silica oxides directly deposited on the surface of the polystyrene templates [13]. Another common method to fabricate microcapsules by the layer-by-layer (LBL) assembly [14,15], multilayer microcapsules with ultrathin wall thickness and tunable wall structures and properties has been fabricated.…”