Surface modification of metal oxide nanoparticles by capillary condensation and its application

Titania nanoparticles were modified using tetraethyl orthosilicate in a capillary condensation process and nanoparticles interconnected by silica layers were obtained. The amount of the silica layer was tunable by adjusting saturation conditions and the thickness of the layer generally increased as the saturation ratio increased up to a saturation ratio of 1.0. However, layer thickness was significantly affected by the geometric dimensions of the space between nanoparticles. Grand canonical Monte Carlo simulation was utilized in order to study the role of particle surface curvature and gap space between particles in capillary condensation. The curvature of the particle surface and the gap space played a crucial role in the meniscus formation…

Contents

I. INTRODUCTION
II. BACKGROUND
2.1 Capillary condensation
2.2 Computer simulation
2.3 Photocatalytic activity of semiconductor particles
III. FLOW CHAMBER DESIGN
3.1 Abstract
3.2 Introduction
3.3 Flow chamber design
IV. CAPILLARY CONDENSATION ONTO TITANIA (TiO2) NANOPARTICLE AGGLOMERATES
4.1 Abstract
4.2 Introduction
4.3 Experimental sections
4.4 Theoretical background
4.5 Results and discussion
4.6 Conclusions
V. GRAND CANONICAL Monte Carlo SIMULATION STUDY OF CAPILLARY CONDENSATION BETWEEN NANOPARTICLES
5.1 Abstract
5.2 Introduction
5.3 Analytical approach of capillary condensation phenomena
5.4 Simulation details
5.5 Results and discussion
5.6 Concluding remarks
vI. PHOTOCATALYTIC ACTIVITY OF SURFACE-MODIFIED TITANIA NANOPARTICLE MIXUTRE CONSISTING OF ANATASE AND RUTILE PHASES
6.1 Abstract
6.2 Introduction
6.3 Experimental
6.4 Results and discussion
6.5 Conclusions
VII. CONCLUSIONS
7.1 Summary
7.2 Future work
APPENDIX
MIXTURES OF DIFFERENT COMPOSITIONS
APPENDIX C. STANDARD OPERATING PROCEDURE OF THE CAPILLARY
CONDENSATION PROCESS
APPENDIX D. STANDARD OPERATING PROCEDURE FOR PHOTOCATLYTIC REACTION OF TITANIA PARTICLE IN METHYLENE BLUE SOLUTION
REFERENCE

Author: Kim, Seonmin

Source: University of Maryland

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