Location-selective immobilisation of single-atom catalysts on the surface or within the interior of ionic nanocrystals using coordination chemistry

白金単原子触媒を担体表面/内部に選択的に担持する方法を開発 --錯体化学を用いた新しい合成戦略および触媒性能への効果--. 京都大学プレスリリース. 2023-07-20.Single-atom catalysts dispersed on support materials show excellent heterogeneous catalytic properties that can be tuned using the interactions between the single atoms and the support. Such interactions depend on whether the single atoms are located on the surface or within the interior of the support. However, little is known about immobilising single atoms on the surface or within the interior of supports deliberately and selectively. Herein, such location-selective placement of single atoms is achieved through the choice of metal complex precursor, solvent, and workup procedure. Using CdSe nanoplatelets as a support, a cis-[PtCl₂(SO(CH₃)₂)₂] precursor in an aprotic solvent exclusively attaches single Pt atoms on the surface of the support. In contrast, a [PtCl₄]²⁻ precursor in a protic solvent followed by amine treatment places 60% of the single Pt atoms inside the support by cation substitution. The surface-adsorbed single Pt atoms show higher stability in photocatalytic hydrogen evolution than the substituted ones, and the preclusion of substitution as internal Pt maximises the activity. Thus, this study provides a viable strategy for the structurally precise synthesis and design of single-atom catalysts

Phylogenetic analyses of Japanese golden chanterelles and a new species description, Cantharellus anzutake sp nov.

ArticleMycoscience. 59(2): 153-165. (2018)journal articl

Thermal Degradation Behavior of Poly(Lactic Acid) in a Blend with Polyethylene

Poly(L-lactic acid) (PLLA) is a candidate for feedstock recycling materials, because it easily depolymerizes back into the cyclic monomer, L,L-lactide. To examine the recycling of PLLA from blends with other kinds of polymers, a polymer blend of PLLA and linear low-density polyethylene (LLDPE) was prepared and thermally degraded with a degradation catalyst: magnesium oxide (MgO) in a thermogravimeter/differential thermal analyzer (TG/DTA) and pyrolysis-gas chromatograph/mass spectrometer (Py-GC/MS). To clarify the influence of the LLDPE ingredient in the blend, the thermal degradation data were analyzed kinetically using two simulation methods: integration and random degradation analytical methods. From the results, it was found that PLLA was effectively depolymerized in the presence of MgO into L,L-lactide with a low racemization ratio and that LLDPE had no effect on the feedstock recycling of PLLA

An azoospermic factor gene, Ddx3y and its paralog, Ddx3x are dispensable in germ cells for male fertility

Takafumi MATSUMURA, Tsutomu ENDO, Ayako ISOTANI, Masaki OGAWA, Masahito IKAWA, An azoospermic factor gene, Ddx3y and its paralog, Ddx3x are dispensable in germ cells for male fertility, Journal of Reproduction and Development, 2019, Volume 65, Issue 2, Pages 121-128, Released April 12, 2019, [Advance publication] Released January 07, 2019, Online ISSN 1348-4400, Print ISSN 0916-8818, https://doi.org/10.1262/jrd.2018-145, https://www.jstage.jst.go.jp/article/jrd/65/2/65_2018-145/_article/-char/e

Efficient establishment of pure cultures of yellow chanterelle Cantharellus anzutake from ectomycorrhizal root tips, and morphological characteristics of ectomycorrhizae and cultured mycelium

ArticleMycoscience. 60(1): 45-53. (2019)journal articl

Protocol for Genome Editing to Produce Multiple Mutants in Wheat

Here, we describe a protocol for producing multiple recessive mutants via genome editing in hexaploid wheat (Triticum aestivum) cv. Fielder. Using Agrobacterium-delivered CRISPR/Cas9 and three sub-genome-specific primer sets, all possible combinations of single, double, and triple transgene-free mutants can be generated. The technique for acceleration of generation advancement with embryo culture reduces time for mutant production. The mutants produced by this protocol can be used for the analysis of gene function and crop improvement. For complete details on the use and execution of this protocol, please refer to Abe et al. (2019)