水溶液での脂質炭素ナノチューブの自己組み立て
1Laboratory of Single-Molecule Biophysics and Polymer Physics, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA.
Journal of the American Chemical Society
|October 19, 2006
まとめ
リソホスフォリピドは,複合体を形成することによって,単一壁の炭素ナノチューブ (SWNT) の溶解性を改善します. この研究は,それらの結合機構が既存のモデルとは異なることを明らかにし,ナノ構造の設計を支援しています.
科学分野:
- 超分子化学 超分子化学
- ナノテクノロジー ナノテクノロジー
- マテリアルサイエンス 材料科学
背景:
- 単一壁の炭素ナノチューブ (SWNTs) は,水害性のために液体相で集積し,そのアプリケーションを制限します.
- リソホスフォリピドはSWNTsと効果的な超分子複合体を形成し,他の薬よりも溶解性を向上させます.
- 以前の観測では,ライソフォスフォリピドがSWNTのストライアを形成していることが示されましたが,その配置は不明でした.
研究 の 目的:
- リンソホスファティディルコレイン (Zwitterionic lysophospholipid) がSWNTsにインシリコ結合するメカニズムを調査する.
- 立体表面活性物質が円筒形ナノ構造に結合する既存のモデルに挑戦する.
- 新しいナノ構造物を設計し,ナノ医療を進歩させるための洞察を提供する.
主な方法:
- 単一壁の炭素ナノチューブに結合するズウィトリアン型リソファスファディチルコレンの計算シミュレーション (in silico study).
- 分子レベルで結合相互作用と構造的取り決めの分析.
主要な成果:
- 脂質表面活性物質が液体相でのSWNTに結合することは,科学文献の3つの一般的なモデルに適合しません.
- 詳細な分子相互作用と配列は,計算分析によって解明されました.
結論:
- この研究は,脂質ナノチューブ相互作用の確立されたモデルに対する説得力のある証拠を提供します.
- これらの結合ダイナミクスを理解することは,先進ナノマテリアルの合理的な設計に不可欠です.
- この研究は,基本的な相互作用を明確にすることによって,ナノ毒性およびナノ医療に関する将来の研究をサポートします.
関連する概念動画
02:18Network Covalent Solids
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
03:22Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
01:18Assembly of Cytoskeletal Filaments
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
01:30Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...