Hollow Capsule Processing through Colloidal Templating and Self-Assembly

Abstract

Hollow capsules of nanometer to micrometer dimensions constitute an important class of materials that are employed in diverse technological applications, ranging from the delivery of encapsulated products for cosmetic and medicinal purposes to their use as light-weight composite materials and as fillers with low dielectric constant in electronic components. Hollow capsules comprising polymer, glass, metal, and ceramic are nowadays routinely produced by using various chemical and physicochemical methods. The current article focuses on a recent novel and versatile technique, based on a combination of colloidal templating and self-assembly processes, developed for synthesizing uniform hollow capsules of a broad range of materials. The strategy outlined readily affords control over the size, shape, composition, and wall thickness of the hollow capsules.

Development of Fabrication of Giant Nanomembranes

“…This method is now widely used for the lamination of oppositely charged polymers, polymers with proteins, and organic with inorganic compounds in the molecular thickness. Preparation of the layer-bylayer assembled ultrathin hollow polymer shells (or nanotubes) has been extensively investigated by Caruso et al [15][16][17][18][19] and by other groups. [20][21][22][23][24][25][26] The preparation of free-standing ultrathin films by this approach has been studied by several groups.…”

Synthesis and Characterization of Nontoxic Hollow Iron Oxide (α-Fe2O

“…From the last few decades controlled synthesis of hollow and porous NPs of metal oxides is of particular interest due to potential applications such as drug delivery, controlled release of drugs, catalysis, artificial cells, chemical storage, light weight fillers, adsorptive materials, and chemical sensors [4][5][6]. Hollow NPs are a unique class in the functional nanomaterials and hollow metal oxide NPs have raised attention due to their thin shell, inner void, and doubled surface area [3,7] in their applications due to their unique nature and different physicochemical properties and a remarkable progress has been made in their synthesis until now [8].…”

Characterisation of hollow Russian doll microspheres

“…In recent years, there has been a great deal of interest in the fabrication of uniformly sized hollow microspheres, as they can be used to encapsulate inorganic or organic materials and for the manufacture of advanced materials [1,2]. The sacrificial core process is one of the most frequently used techniques to produce hollow inorganic spheres [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…The sacrificial core process is one of the most frequently used techniques to produce hollow inorganic spheres [1][2][3][4][5][6][7][8][9][10][11][12]. The sacrificial core approach involves the use of a solid organic or inorganic spherical particle as the template.…”

“…The core-shell structure is produced by coating the core with inorganic precursors or nanoparticles which are crosslinked to form the shell. Hollow spherical particles are subsequently generated by removing the template from the core-shell structure thermally [1][2][3][4][5][6][7][8][9][10] or chemically [1-3, 11, 12].…”