Materials 2010, 3(8), 4355-4386; doi:10.3390/ma3084355
Review

Nanoscale Hollow Spheres: Microemulsion-Based Synthesis, Structural Characterization and Container-Type Functionality

Institut für Anorganische Chemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
* Author to whom correspondence should be addressed.
Received: 5 July 2010; in revised form: 22 July 2010 / Accepted: 6 August 2010 / Published: 12 August 2010
(This article belongs to the Special Issue Progress in Nanomaterials Preparation)
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Abstract: A wide variety of nanoscale hollow spheres can be obtained via a microemulsion approach. This includes oxides (e.g., ZnO, TiO2, SnO2, AlO(OH), La(OH)3), sulfides (e.g., Cu2S, CuS) as well as elemental metals (e.g., Ag, Au). All hollow spheres are realized with outer diameters of 10-60 nm, an inner cavity size of 2-30 nm and a wall thickness of 2-15 nm. The microemulsion approach allows modification of the composition of the hollow spheres, fine-tuning their diameter and encapsulation of various ingredients inside the resulting “nanocontainers”. This review summarizes the experimental conditions of synthesis and compares them to other methods of preparing hollow spheres. Moreover, the structural characterization and selected properties of the as-prepared hollow spheres are discussed. The latter is especially focused on container-functionalities with the encapsulation of inorganic salts (e.g., KSCN, K2S2O8, KF), biomolecules/bioactive molecules (e.g., phenylalanine, quercetin, nicotinic acid) and fluorescent dyes (e.g., rhodamine, riboflavin) as representative examples.
Keywords: hollow sphere; nanomaterial; microemulsion synthesis; structural characterization; properties; container functionality

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MDPI and ACS Style

Gröger, H.; Kind, C.; Leidinger, P.; Roming, M.; Feldmann, C. Nanoscale Hollow Spheres: Microemulsion-Based Synthesis, Structural Characterization and Container-Type Functionality. Materials 2010, 3, 4355-4386.

AMA Style

Gröger H, Kind C, Leidinger P, Roming M, Feldmann C. Nanoscale Hollow Spheres: Microemulsion-Based Synthesis, Structural Characterization and Container-Type Functionality. Materials. 2010; 3(8):4355-4386.

Chicago/Turabian Style

Gröger, Henriette; Kind, Christian; Leidinger, Peter; Roming, Marcus; Feldmann, Claus. 2010. "Nanoscale Hollow Spheres: Microemulsion-Based Synthesis, Structural Characterization and Container-Type Functionality." Materials 3, no. 8: 4355-4386.

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