scholarly journals Catalytic nanoreactors in continuous flow: hydrogenation inside single-walled carbon nanotubes using supercritical CO2

2014 ◽  
Vol 50 (40) ◽  
pp. 5200-5202 ◽  
Author(s):  
Thomas W. Chamberlain ◽  
James H. Earley ◽  
Daniel P. Anderson ◽  
Andrei N. Khlobystov ◽  
Richard A. Bourne
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Reactions ◽  
Continuous Flow ◽  
Supercritical Co2 ◽  
Single Walled Carbon Nanotubes ◽  
Reaction Vessel ◽  
Preparative Scale ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

One nanometre wide carbon nanoreactors are utilised as the reaction vessel for catalytic chemical reactions on a preparative scale.

Vertical Alignment of Single-Walled Carbon Nanotubes on Chemically Functionalized Silicon Substrates

2002 ◽  
Vol 739 ◽  
Author(s):  
Ha-Jin Lee ◽  
Hyeyoung Park ◽  
Sunyoung Koo ◽  
Haiwon Lee
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Time ◽  
Chemical Reactions ◽  
Chemical Reaction ◽  
Single Walled Carbon Nanotubes ◽  
Vertical Alignment ◽  
Single Walled Carbon ◽  
Functionalized Surfaces ◽  
Bundle Size ◽  
Walled Carbon Nanotubes

ABSTRACTCarbon nanotubes have been widely investigated as an essential component for fabricating nanoelectronic devices and for their numerous applications. We investigated the vertical alignment of single-walled carbon nanotubes (SWNTs) on chemically functionalized Si surfaces using chemical reactions between chemical groups in SWNTs and surfaces. For controlling the high selectivity of a specific chemical reaction, a pre-patterned 3-D nanostructure was used by using AFM anodization lithography for achieving the vertical alignment of SWNTs. To consider the subsequent chemical reaction with chemically modified Si surface, the carboxylic acid groups were converted into acid chloride groups followed by the reaction with chemically functionalized surfaces. The protruded structures on pre-patterned areas strongly suggest the vertically oriented SWNTs, and the distribution of the vertically aligned SWNTs becomes denser and their heights are longer with prolonged reaction time. The aspect ratio of SWNTs aligned on -OH functionalized surface is independent from the reaction time (H/W = 0.2). After random alignment of relatively shorter nanotubes on the substrate, their bundle size increases with increasing the reaction time due to strong van der Waals interaction between the lateral sides of nanotubes described as ‘nucleation growth’. Longer tubes get also adsorbed on the surface by increase in the bundle size and nanotube length, simultaneously. Based on the chemical reactions of the modified SWNTs with functionalized surfaces, selective attachments of SWNTs were carried out onto pre-patterned surfaces. Detailed characterization of aligned SWNTs will be discussed.

scholarly journals Controlled slicing of single walled carbon nanotubes under continuous flow

Carbon ◽  
2018 ◽  
Vol 140 ◽  
pp. 428-432 ◽  
Author(s):  
Thaar M.D. Alharbi ◽  
Kasturi Vimalanathan ◽  
Warren D. Lawrance ◽  
Colin L. Raston
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Flow ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Confined propagation of covalent chemical reactions on single-walled carbon nanotubes

2011 ◽  
Vol 2 (1) ◽  
Author(s):  
Shunliu Deng ◽  
Yin Zhang ◽  
Alexandra H. Brozena ◽  
Maricris Lodriguito Mayes ◽  
Parag Banerjee ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Reactions ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Thioamidation of Single-Walled Carbon Nanotubes: a New Chemical Functionalization Protocol by the Willgerodt - Kindler Reaction

2009 ◽  
Vol 62 (5) ◽  
pp. 413 ◽  
Author(s):  
Hossein Reza Darabi ◽  
Shabnam Mohandessi ◽  
Kioumars Aghapoor ◽  
Farshid Mohsenzadeh ◽  
Mohammad Hashemi Karouei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Reactions ◽  
Secondary Amine ◽  
Convenient Method ◽  
Single Walled Carbon Nanotubes ◽  
Covalent Attachment ◽  
Chemical Functionalization ◽  
Single Walled Carbon ◽  
Side Walls ◽  
Walled Carbon Nanotubes

A new and convenient method for covalent attachment of thioamide groups to the side-walls of carbon nanotubes (SWNT) via the Willgerodt–Kindler (WK) reaction is presented. Treating SWNTs with 4-acetylaniline and subsequently with morpholine as a secondary amine and sulfur leads to the thioamidation of SWNTs. This approach paves the way for a new chemical functionalization protocol to enhance the potential of SWNTs for further chemical reactions applicable in various fields.

scholarly journals Aminated Single-walled Carbon Nanotubes as Carrier for Covalent Immobilization of Phenylalanine Ammonia-lyase

2017 ◽  
Vol 61 (1) ◽  
pp. 59 ◽  
Author(s):  
Judith Hajnal Bartha-Vári ◽  
László Csaba Bencze ◽  
Evelin Bell ◽  
László Poppe ◽  
Gabriel Katona ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Flow ◽  
Phenylalanine Ammonia Lyase ◽  
Kinetic Resolution ◽  
Single Walled Carbon Nanotubes ◽  
Packed Bed Reactor ◽  
Original Activity ◽  
Single Walled Carbon ◽  
Ammonia Addition ◽  
Walled Carbon Nanotubes

A new and efficient immobilized form of phenylalanine ammonia-lyase (PAL) was obtained by covalent linkage onto amino functionalized single-walled carbon nanotubes (SwCNTNH2) as carrier. The catalytic properties of the resulted nanostructured biocatalyst (SwCNTNH2-PAL) were tested in the kinetic resolution of racemic 2-amino-3-(thiophen-2-yl)propanoic acid 1 by ammonia elimination and in the enantiotope selective addition of ammonia onto (E)-3-(thiophen-2-yl)acrylic acid 2. SwCNTNH2-PAL was a durable biocatalyst in batch mode for ammonia elimination from 1 (>85% of original activity after 7 cycles) and in ammonia addition to 2 (>70% of original activity after 3 cycles in 6 M NH3 , pH 10.0). The ammonia addition onto 2 was also studied in a continuous-flow microreactor packed with SwCNTNH2-PAL (2 M NH3, pH 10.0, 15 bar) in the 30-80 °C temperature range. No significant loss of PAL activity was observed over 72 h in the microreactor up to 60 °C. Productivity of SwCNTNH2-PAL at 30 °C was significantly higher in the enantiotope selective ammonia addition performed in a packed-bed reactor operated in continuous-flow mode (rflow =2.41 mmol min-1 g-1) than in the reaction performed in batch system (rbatch = 1.38 mmol min-1 g-1).

scholarly journals Immobilization of Phenylalanine Ammonia-Lyase on Single-Walled Carbon Nanotubes for Stereoselective Biotransformations in Batch and Continuous-Flow Modes

ChemCatChem ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 1122-1128 ◽  
Author(s):  
Judith H. Bartha-Vári ◽  
Monica I. Toşa ◽  
Florin-Dan Irimie ◽  
Diána Weiser ◽  
Zoltán Boros ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Flow ◽  
Phenylalanine Ammonia Lyase ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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