date: 2021-01-15T08:43:58Z
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pdf:docinfo:title: From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties
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Keywords: inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy
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subject: Oxide inverse opals (IOs) with their high surface area and open porosity are promising candidates for catalyst support applications. Supports with confined mesoporous domains are of added value to heterogeneous catalysis. However, the fabrication of IOs with mesoporous or sub-macroporous voids (<100 nm) continues to be a challenge, and the diffusion of tracers in quasi-mesoporous IOs is yet to be adequately studied. In order to address these two problems, we synthesized ZnO IOs films with tunable pore sizes using chemical bath deposition and template-based approach. By decreasing the size of polystyrene (PS) template particles towards the mesoporous range, ZnO IOs with 50 nm-sized pores and open porosity were synthesized. The effect of the template-removal method on the pore geometry (spherical vs. gyroidal) was studied. The infiltration depth in the template was determined, and the factors influencing infiltration were assessed. The crystallinity and photonic stop-band of the IOs were studied using X-Ray diffraction and UV-Vis, respectively. The infiltration of tracer molecules (Alexa Fluor 488) in multilayered quasi-mesoporous ZnO IOs was confirmed via confocal laser scanning microscopy, while fluorescence correlation spectroscopy analysis revealed two distinct diffusion times in IOs assigned to diffusion through the pores (fast) and adsorption on the pore walls (slow).
dc:creator: Shravan R. Kousik, Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov and Petia Atanasova
dcterms:created: 2021-01-14T08:22:00Z
Last-Modified: 2021-01-15T08:43:58Z
dcterms:modified: 2021-01-15T08:43:58Z
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title: From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties
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pdf:docinfo:keywords: inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy
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dc:title: From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties
modified: 2021-01-15T08:43:58Z
cp:subject: Oxide inverse opals (IOs) with their high surface area and open porosity are promising candidates for catalyst support applications. Supports with confined mesoporous domains are of added value to heterogeneous catalysis. However, the fabrication of IOs with mesoporous or sub-macroporous voids (<100 nm) continues to be a challenge, and the diffusion of tracers in quasi-mesoporous IOs is yet to be adequately studied. In order to address these two problems, we synthesized ZnO IOs films with tunable pore sizes using chemical bath deposition and template-based approach. By decreasing the size of polystyrene (PS) template particles towards the mesoporous range, ZnO IOs with 50 nm-sized pores and open porosity were synthesized. The effect of the template-removal method on the pore geometry (spherical vs. gyroidal) was studied. The infiltration depth in the template was determined, and the factors influencing infiltration were assessed. The crystallinity and photonic stop-band of the IOs were studied using X-Ray diffraction and UV-Vis, respectively. The infiltration of tracer molecules (Alexa Fluor 488) in multilayered quasi-mesoporous ZnO IOs was confirmed via confocal laser scanning microscopy, while fluorescence correlation spectroscopy analysis revealed two distinct diffusion times in IOs assigned to diffusion through the pores (fast) and adsorption on the pore walls (slow).
pdf:docinfo:subject: Oxide inverse opals (IOs) with their high surface area and open porosity are promising candidates for catalyst support applications. Supports with confined mesoporous domains are of added value to heterogeneous catalysis. However, the fabrication of IOs with mesoporous or sub-macroporous voids (<100 nm) continues to be a challenge, and the diffusion of tracers in quasi-mesoporous IOs is yet to be adequately studied. In order to address these two problems, we synthesized ZnO IOs films with tunable pore sizes using chemical bath deposition and template-based approach. By decreasing the size of polystyrene (PS) template particles towards the mesoporous range, ZnO IOs with 50 nm-sized pores and open porosity were synthesized. The effect of the template-removal method on the pore geometry (spherical vs. gyroidal) was studied. The infiltration depth in the template was determined, and the factors influencing infiltration were assessed. The crystallinity and photonic stop-band of the IOs were studied using X-Ray diffraction and UV-Vis, respectively. The infiltration of tracer molecules (Alexa Fluor 488) in multilayered quasi-mesoporous ZnO IOs was confirmed via confocal laser scanning microscopy, while fluorescence correlation spectroscopy analysis revealed two distinct diffusion times in IOs assigned to diffusion through the pores (fast) and adsorption on the pore walls (slow).
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pdf:docinfo:creator: Shravan R. Kousik, Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov and Petia Atanasova
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creator: Shravan R. Kousik, Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov and Petia Atanasova
meta:author: Shravan R. Kousik, Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov and Petia Atanasova
dc:subject: inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy
meta:creation-date: 2021-01-14T08:22:00Z
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meta:keyword: inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy
Author: Shravan R. Kousik, Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov and Petia Atanasova
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