A versatile colloidal Janus platform: surface asymmetry control, functionalization, and applications

Chengjiao Wu; Ziwei Deng; Bin Shang; Olli Ikkala; Bo Peng

doi:10.1039/c8cc06830e

A versatile colloidal Janus platform: surface asymmetry control, functionalization, and applications

Chemical Communications ◽

10.1039/c8cc06830e ◽

2018 ◽

Vol 54 (90) ◽

pp. 12726-12729 ◽

Cited By ~ 12

Author(s):

Chengjiao Wu ◽

Ziwei Deng ◽

Bin Shang ◽

Olli Ikkala ◽

Bo Peng

Keyword(s):

Multiple Roles ◽

Magnetic Vectors

A versatile colloidal Janus platform with tunable surface asymmetries and functions was achieved and can play multiple roles as Pickering emulsifiers, catalysts and magnetic vectors in wastewater remedy.

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Microchemistry of ZnO Varistors

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100133102 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1694-1695

Author(s):

K. K. Soni ◽

J. Hwang ◽

V. P. Dravid ◽

T. O. Mason ◽

R. Levi-Setti

Keyword(s):

Grain Boundaries ◽

Multiple Roles ◽

Grain Boundary Engineering ◽

Ion Microprobe ◽

Dopant Distribution ◽

Important Ingredient ◽

Zno Varistor ◽

Zno Varistors ◽

Zno Powder ◽

The University

ZnO varistors are made by mixing semiconducting ZnO powder with powders of other metal oxides e.g. Bi2O3, Sb2O3, CoO, MnO2, NiO, Cr2O3, SiO2 etc., followed by conventional pressing and sintering. The non-linear I-V characteristics of ZnO varistors result from the unique properties that the grain boundaries acquire as a result of dopant distribution. Each dopant plays important and sometimes multiple roles in improving the properties. However, the chemical nature of interfaces in this material is formidable mainly because often trace amounts of dopants are involved. A knowledge of the interface microchemistry is an essential component in the ‘grain boundary engineering’ of materials. The most important ingredient in this varistor is Bi2O3 which envelopes the ZnO grains and imparts high resistance to the grain boundaries. The solubility of Bi in ZnO is very small but has not been experimentally determined as a function of temperature.In this study, the dopant distribution in a commercial ZnO varistor was characterized by a scanning ion microprobe (SIM) developed at The University of Chicago (UC) which offers adequate sensitivity and spatial resolution.

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