高濃度で迅速に機能化され,水中に分散した炭素ナノチューブ

Yubing Wang¹, Zafar Iqbal, Somenath Mitra

¹Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA.

Journal of the American Chemical Society

|January 5, 2006

まとめ

マイクロ波機能化により,水分分散性の高い単一壁の炭素ナノチューブ (SWNT) が急速に生み出され,前例のない安定濃度を達成し,先進的な材料アプリケーションの可能性を実証しました.

科学分野:

マテリアルサイエンス材料科学
ナノテクノロジーナノテクノロジー
化学工学は化学工学というものです.

背景:

シングルウォールカーボンナノチューブ (SWNT) は優れた性能を誇るが,水溶液での分散性が悪い.
効果的な機能化は,様々なアプリケーションのSWNTの溶解性と処理性を高めるために不可欠です.

研究の目的:

高水分散性を達成するためにSWNTを機能化するための迅速かつ効率的な方法を開発する.
合成されたSWNTsの機能群,分散品質,および性質を特徴付ける.

主な方法:

窒素酸と硫黄酸の混合物を用いたSWNTのマイクロ波支援機能化.
フーリエ変換赤外線スペクトル検査,元素分析,ラマンスペクトル検査,スキャニング電子顕微鏡検査,伝送電子顕微鏡検査,レーザー光散射を用いた特徴化.
機能化されたSWNT膜の電気伝導性の評価.

主要な成果:

10 mg/mLのSWNTの安定した水中濃度を達成し,2度程度の増加しました.
重要な表面覆いを持つSWNTのカルボキシル化および硫化機能群を特定した.
広範な解体と真の溶液の形成が実証され,触媒の含有量が減少しました.
薄膜のSWNTの平行並列が観察され,電気伝導性が維持されました.

結論:

マイクロ波補助機能化は,水中に分散するSWNTを生産するための非常に効果的な方法です.
機能化されたSWNTは,分散が改善され,不純物質が減少し,電気的性質が保持されています.
この方法は,高性能なSWNTベースの材料のスケーラブルな生産のための有望な経路を提供します.

さらに関連する動画

09:12

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

08:33

Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process

Published on: May 30, 2017

関連する概念動画

01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...

02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

01:15

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation. However, because inorganic electron donors...

01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...

01:23

Microbial Fuel Cells

Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...

関連する実験動画