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自己適応型コロイド結晶の形状記憶
Seungkyu Lee1,2, Heather A Calcaterra2,3, Sangmin Lee4,5
1Department of Chemistry, Northwestern University, Evanston, USA.
Nature
|October 17, 2022
まとめ
DNAで作られたコロイド結晶は 驚くべき力学的な回復力を表しています これらの材料は変形し,再生時に元の構造と光学特性を迅速に回復します.
科学分野:
- 材料科学
- ナノテクノロジー
- 柔らかい物質の物理
背景:
- 再構成可能で 機械的に反応する結晶材料は 先進的な装置に不可欠です
- 結晶の変形回復は結合型に大きく依存し,分子結合は静電相互作用よりも高い弾力性を可能にします.
研究 の 目的:
- DNA製のコロイド結晶の 変形特性について調べるため
- 機械的変形と可逆光学特性変化の関係を理解する
主な方法:
- 体中心の立方体構造と高粘着弾性体積分 (97%以上) を有する大きな (100μm以上の) コロイド結晶の製造.
- 結晶を不規則な形に圧縮し,その後構造回復を観察するために再水分化します.
- 変形前の,時の,後の光学特性変化 (吸収と反射) の分析.
主要な成果:
- や折りたたみで不規則な形に変形したコロイド結晶は,リヒドレーションで初期形態とナノスケールの順番をすばやく回復しました.
- ほとんどの結晶材料とは違って このDNAで作られた結晶は 永久的な損傷なしに 重要な構造変化を遂げました
- 変形は光学特性の可逆的な変化を引き起こし,変化した屈折指数と不均一性による反射率 (最大50%) が増加し,回復した結晶は高いブロードバンド吸収率 (98%以上) を示した.
結論:
- DNAで作られたコロイド結晶は 特殊な機械的反応と 急速な自己治癒能力を示しています
- リバーシブルな構造と光学的性質の変化は,適応性のある材料と反応性のあるデバイスでの応用の可能性を強調しています.
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