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Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light.

ABSTRACT: Platinum nanocrystals with a fine control of the crystal domain size in the range 1.0-2.2 nm are produced by tuning the NaOH concentration during the UV-induced reduction of H2PtCl6 in surfactant-free alkaline ethylene glycol. The colloidal solutions obtained are characterized by transmission electron microscopy and pair distribution function analysis, allowing analysis of both atomic and nanoscale structures. The obtained nanoparticles exhibit a face-centered cubic crystal structure even for the smallest nanoparticles, and the cubic unit cell parameter is significantly reduced with decreasing crystallite size. It is further demonstrated how the "UV-approach" can be used to achieve spatial control of the nucleation and growth of the platinum nanocrystals, which is not possible by thermal reduction.

SUBMITTER: Quinson J

PROVIDER: S-EPMC6120742 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light.

Quinson Jonathan J Kacenauskaite Laura L Christiansen Troels L TL Vosch Tom T Arenz Matthias M Jensen Kirsten M Ø KMØ

ACS omega 20180801 8

Platinum nanocrystals with a fine control of the crystal domain size in the range 1.0-2.2 nm are produced by tuning the NaOH concentration during the UV-induced reduction of H<sub>2</sub>PtCl<sub>6</sub> in surfactant-free alkaline ethylene glycol. The colloidal solutions obtained are characterized by transmission electron microscopy and pair distribution function analysis, allowing analysis of both atomic and nanoscale structures. The obtained nanoparticles exhibit a face-centered cubic crystal ...[more]

PMID: 30198008

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Project description:Background and aimsAustralian sexually deceptive Chiloglottis orchids attract their specific male wasp pollinators by means of 2,5-dialkylcyclohexane-1,3-diones or 'chiloglottones', representing a newly discovered class of volatiles with unique structures. This study investigated the hypothesis that UV-B light at low intensities is directly required for chiloglottone biosynthesis in Chiloglottis trapeziformis.MethodsChiloglottone production occurs only in specific tissue (the callus) of the labellum. Cut buds and flowers, and whole plants with buds and flowers, sourced from the field, were kept in a growth chamber and interactions between growth stage of the flowers and duration and intensity of UV-B exposure on chiloglottone production were studied. The effects of the protein synthesis inhibitor cycloheximide were also examined.Key resultsChiloglottone was not present in buds, but was detected in buds that were manually opened and then exposed to sunlight, or artificial UV-B light for ?5?min. Spectrophotometry revealed that the sepals and petals blocked UV-B light from reaching the labellum inside the bud. Rates of chiloglottone production increased with developmental stage, increasing exposure time and increasing UV-B irradiance intensity. Cycloheximide did not inhibit the initial production of chiloglottone within 5?min of UV-B exposure. However, inhibition of chiloglottone production by cycloheximide occurred over 2?h of UV-B exposure, indicating a requirement for de novo protein synthesis to sustain chiloglottone production under UV-B.ConclusionsThe sepals and petals of Chiloglottis orchids strongly block UV-B wavelengths of light, preventing chiloglottone production inside the bud. While initiation of chiloglottone biosynthesis requires only UV-B light, sustained chiloglottone biosynthesis requires both UV-B and de novo protein biosynthesis. The internal amounts of chiloglottone in a flower reflect the interplay between developmental stage, duration and intensity of UV-B exposure, de novo protein synthesis, and feedback loops linked to the starting amount of chiloglottone. It is concluded that UV-B light contributes directly to chiloglottone biosynthesis. These findings suggest an entirely new and unexpected biochemical reaction that might also occur in taxa other than these orchids.

Dataset Information

Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light.

Publications

Spatially Localized Synthesis and Structural Characterization of Platinum Nanocrystals Obtained Using UV Light.

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