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触媒性ナノ粒子超網の構造と多孔性をDNAで制御する
Evelyn Auyeung1, William Morris, Joseph E Mondloch
1Department of Materials Science and Engineering, Northwestern University , 2220 Campus Drive, Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|January 23, 2015
まとめ
研究者は,不活性な金ナノ粒子超網をアルコールの酸化のための活性な触媒に変換する方法を開発しました. このDNAによるアセンブリとカルシネーションプロセスは,多孔性で,構造的に定義された異質な触媒を生成します.
科学分野:
- 材料科学 材料科学とは
- ナノテクノロジー ナノテクノロジー
- カタリシス カタリシス カタリシス
背景:
- 高結晶ナノ粒子超網は,しばしば触媒的に無活性である.
- ナノ粒子触媒の構造とアクセシビリティを制御することは,その性能にとって極めて重要です.
- ナノ粒子触媒の特徴と安定化のための既存の方法は,挑戦的かもしれません.
研究 の 目的:
- 不活性なナノ粒子超網を触媒的に活性な多孔構造に変換するための戦略を開発する.
- アルコール酸化におけるこれらの改変されたスーパーラットスの触媒的活性を調べる.
- 構造的に定義された異質な触媒を作り出すためのボトムアップのアプローチを実証する.
主な方法:
- DNA改変ナノ粒子を用いて,体中心の立方体 (bcc) 金ナノ粒子スーパーラットスの合成.
- スーパーラティスをシリカに埋め込み,その後350°Cで焼却.
- 表面積分析,誘導結合プラズマ質量スペクトロメトリ,電子顕微鏡を用いた特徴付け.
主要な成果:
- カルシネートされたスーパーグリットはbccの順番を維持し,210 m2/gの表面積を示した.
- 超格子には重量約10%の金が含まれ,アルコールの酸化における触媒的活性を示した.
- 電子顕微鏡では,カルシネーションとカタリシス後の結晶構造の保存が確認されました.
結論:
- 開発された方法は,不活性なナノ粒子超網を,活性で多孔性の異質な触媒に成功裏に変換します.
- DNAテンプレート型ナノ粒子超網は,構造的に定義された触媒への制御可能な経路を提供します.
- このアプローチは,集積および特徴付けの難しさなどの大量ナノ粒子触媒の限界を克服します.
関連する概念動画
DNA as a Genetic Template
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
Single-Strand DNA Binding Proteins
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
DNA as a Genetic Template
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...

