scholarly journals The Piezoresistive Highly Elastic Sensor Based on Carbon Nanotubes for the Detection of Breath

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 713 ◽  
Author(s):  
Romana Daňová ◽  
Robert Olejnik ◽  
Petr Slobodian ◽  
Jiri Matyas
Keyword(s):  
Carbon Nanotubes ◽  
Flexible Substrate ◽  
Thermoplastic Polyurethane ◽  
Aqueous Dispersion ◽  
Portable Devices ◽  
Multiwalled Carbon ◽  
Novel Technique ◽  
Subsequent Application ◽  
Wearable Electronic ◽  
Type Frequency

Wearable electronic sensor was prepared on a light and flexible substrate. The breathing sensor has a broad assumption and great potential for portable devices in wearable technology. In the present work, the application of a flexible thermoplastic polyurethane/multiwalled carbon nanotubes (TPU/MWCNTs) strain sensor was demonstrated. This composite was prepared by a novel technique using a thermoplastic filtering membrane based on electrospinning technology. Aqueous dispersion of MWCNTs was filtered through membrane, dried and then welded directly on a T-shirt and encapsulated by a thin silicone layer. The sensing layer was also equipped by electrodes. A polymer composite sensor is capable of detecting a deformation by changing its electrical resistance. A T-shirt was capable of analyzing a type, frequency and intensity of human breathing. The sensitivity to the applied strain of the sensor was improved by the oxidation of MWCNTs by potassium permanganate (KMnO4) and also by subsequent application of the prestrain.

scholarly journals Tuning the Solubility Parameters of Carbon Nanotubes by Means of Their Adducts with Janus Pyrrole Compounds

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1176
Author(s):  
Daniele Locatelli ◽  
Vincenzina Barbera ◽  
Luigi Brambilla ◽  
Chiara Castiglioni ◽  
Annalisa Sironi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solubility Parameter ◽  
Reaction Pathway ◽  
Aqueous Dispersion ◽  
Solubility Parameters ◽  
High Yield ◽  
Primary Amines ◽  
Multiwalled Carbon ◽  
Chemical Structures ◽  
Carbon Efficiency

The solubility parameters of multiwalled carbon nanotubes (CNTs) was tuned via their chemical modification with pyrrole compounds (PyCs), by means of a simple and sustainable methodology. PyCs were synthesized with high atom efficiency through the Paal–Knorr reaction of primary amines with 2,5-hexanedione, in the absence of solvents and catalysts. Methylamine, 1-dodecylamine, 2-amino-1,3-propanediol, and 3-(triethoxysilyl)propan-1-amine were selected. PyCs are characterized by two moieties, the pyrrole ring and the substituent of the nitrogen atom, and can be considered as Janus molecules. The functionalization of CNTs occurred with a high yield by simply heating CNTs and PyC. The whole reaction pathway did not produce any waste and was characterized by a carbon efficiency up to almost 100%. Thanks to the variety of PyC chemical structures, the CNT solubility parameter was modified in a pretty broad range of values, in the expected direction. Stable CNT dispersions were prepared in different solvents. From the aqueous dispersion, coating layers were prepared with high electrical conductivity, larger with respect to a top commercial product. The “pyrrole methodology” reported here is based on one reaction and allows almost infinite variations of the CNT solubility parameter, thus promoting their compatibility with target matrices and allowing the preparation of nanocomposite materials with improved properties. This work thus paves the way for a highly efficient exploitation of CNTs.

Aqueous dispersion of surfactant-modified multiwalled carbon nanotubes and their application as an antibacterial agent

Carbon ◽  
2011 ◽  
Vol 49 (11) ◽  
pp. 3663-3671 ◽  
Author(s):  
Yu Bai ◽  
Il Song Park ◽  
Sook Jeong Lee ◽  
Tae Sung Bae ◽  
Fumio Watari ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Antibacterial Agent ◽  
Aqueous Dispersion ◽  
Multiwalled Carbon

scholarly journals Key role of the linker in pyrene-linker-carboxylate surfactants for the efficient aqueous dispersion of multiwalled carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 95360-95368 ◽  
Author(s):  
Daniel J. Welsh ◽  
Luke J. O'Driscoll ◽  
Steven W. D. Bailey ◽  
David Visontai ◽  
Kara Howes ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Aqueous Dispersion ◽  
Multiwalled Carbon ◽  
Linker Group

This study establishes that the structure of the linker group between the hydrophobic and hydrophilic units in the new surfactants 1–13 plays an important role in the dispersibility of multiwalled carbon nanotubes (MWNTs) in water.

scholarly journals Dispersion and characterization of thermoplastic polyurethane/multiwalled carbon nanotubes by melt mixing

2011 ◽  
Vol 122 (6) ◽  
pp. 3744-3750 ◽  
Author(s):  
Adolfo Benedito ◽  
Ignacio Buezas ◽  
Enrique Giménez ◽  
Begoña Galindo ◽  
Amaya Ortega
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Thermoplastic Polyurethane ◽  
Melt Mixing ◽  
Multiwalled Carbon
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