scholarly journals Rapid Coating of Aqueous Pearls with Carbon Nanotubes via In Situ Polymerization of Dopamine

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Lin Rong ◽  
Xiaoqing Mu ◽  
Jinchao Zhao ◽  
Leping Huang ◽  
Mingqiao Ye ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
In Situ Polymerization ◽  
Adhesive Property ◽  
Loss Ratio ◽  
Multiwalled Carbon ◽  
Mild Conditions ◽  
Uniform Coating ◽  
Modification Process ◽  
Aqueous Core

Millimeter-scale calcium alginate aqueous core capsules (mm-CaSA-Caps) are suitable for embedding of temperature and chemical sensitive substances because of its excellent biocompatibility and biodegradability. In this study, mm-CaSA-Caps were coated with multiwalled carbon nanotubes (MWNTs) via in situ self-polymerization of dopamine (DA) under mild conditions. During the modification process, mm-CaSA-Caps transferred quickly from colorless and transparent capsules to dark and opaque “pearls” in 15 min. The obtained MWNTs-polydopamine- (PDA-) modified mm-CaSA-Caps (mm-MWNTs-PDA@CaSA-Caps) retained the spherical appearance of mm-CaSA-Caps with uniform coating of MWNTs-PDA. Obviously, the MWNTs were easily coated on the mm-PDA@CaSA-Caps due to the strong adhesive property of PDA. As the MWNTs content increased, the stacking density of MWNTs on surface of the mm-MWNTs-PDA@CaSA-Caps raised. The water loss ratio of mm-MWNTs-PDA@CaSA-Caps was enhanced ascribed to increasing the path length of water by raising stacking density of MWNTs. This study provided a new path for enhancement of the barrier property of hydrogel capsules.

A facile preparation of CoFe2O4 nanoparticles on polyaniline-functionalised carbon nanotubes as enhanced catalysts for the oxygen evolution reaction

2016 ◽  
Vol 4 (12) ◽  
pp. 4472-4478 ◽  
Author(s):  
Yang Liu ◽  
Jing Li ◽  
Feng Li ◽  
Wenzhu Li ◽  
Haidong Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Cofe2o4 Nanoparticles ◽  
Multiwalled Carbon ◽  
Mild Conditions ◽  
Facile Preparation

A polyaniline-multiwalled carbon nanotube supported, high performance CoFe2O4 nanoparticle loaded electrocatalyst is synthesized through a novel and simple in situ process under mild conditions.

In situ polymerization of functionalized multiwalled-carbon nanotubes/epoxy resin composite fibers using a non-solvent technique

2020 ◽  
pp. 096739112093523
Author(s):  
Mohammad Ebrahim Karkhanehchin ◽  
Morteza Maghrebi ◽  
Majid Baniadam ◽  
Ali Dashti ◽  
Maryam Mokhtarifar
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Epoxy Resin ◽  
In Situ Polymerization ◽  
Syringe Pump ◽  
Composite Fibers ◽  
Multiwalled Carbon ◽  
Functionalized Multiwalled Carbon Nanotubes

The aim of this study was to produce carbon nanotubes (CNTs)/polymer composite fibers by wet spinning without any solvent. The functionalized multiwalled-carbon nanotubes (F-MWNTs)/epoxy resin was synthesized by in situ polymerization method. Epoxy resin, F-MWNTs, and curing agent were mixed and injected by a syringe pump. The effects of operating parameters including the percentage of CNTs and the extrusion velocity of the syringe pump on the dispersion and alignment of F-MWNTs in the cross-section of F-MWNTs/polymer composite fibers were investigated. The composite fibers were characterized by tensile strength analysis, scanning electron microscopy (SEM), and electrical conductivity analysis. The experimental results showed that a decrease (30 ml/h to 15 ml/h) in extrusion velocity increased the electrical conductivity of composite fibers by more than 3%. This behavior was attributed to the higher alignment of F-MWNTs and improved conducting pathways along the composite fiber axis, as observed by SEM. In addition, by reducing extrusion velocity (30 ml/h to 15 ml/h), the tensile strength of composite fibers was enhanced just over twofold due to the better arrangement of CNTs which can be attributed to the further retention time of composite fibers and the pressure of the walled-needle. Moreover, the higher the processing time of spinning, the lower electrical conductivity of the fibers is which might be due to the higher coagulation of fibers.

scholarly journals Morphology of polyamide 6 confined into carbon nanotubes

2015 ◽  
Vol 33 (2) ◽  
pp. 306-311
Author(s):  
Agnieszka Piegat ◽  
Zygmunt Staniszewski ◽  
Artur Poeppel ◽  
Miroslawa El Fray
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Polyamide 6 ◽  
Multiwalled Carbon ◽  
Simple Method ◽  
Melt Compounding ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThe preparation of polymer nanocomposites filled with carbon nanotubes requires the nanotubes to be uniformly dispersed and compatible with the polymer matrix. In this work we report a preparation method of polyamide 6 (PA 6) based nanocomposite containing multi-walled carbon nanotubes (MWCNT) without any additional surface modification and obtained by in situ polymerization, as a simple method for composites production. The process was assisted by ultrasounds prior to synthesis.With such a method, an interesting morphology of polyamide 6 confined into a multiwalled carbon nanotube as well as grafted on a carbon nanotube surface was observed. For comparative purpose, PA 6 nanocomposites were also prepared from commercially available master batch by melt compounding.

Polymer Nanohybrids With High Electrical Conductivities

2012 ◽  
Vol 1371 ◽  
Author(s):  
R. Yañez-Macías ◽  
P. González-Morones ◽  
C Ávila-Orta ◽  
S. Torres-Rincón ◽  
J. Valdéz-Garza ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Irradiation Time ◽  
Surface Conductivity ◽  
The Other ◽  
Multiwalled Carbon ◽  
Electrical Conductivities ◽  
Opposite Behavior

ABSTRACTMultiwalled carbon nanotube (MWCNT)/Nylon-6 nanohybrids were prepared by in situ polymerization under microwave irradiation. The effect of time and power of irradiation on the surface conductivity of the nanohybrid was studied. It was observed that the resistivity increases with irradiation time at low microwave power (200W). On the other hand, at high power (600W) an opposite behavior was observed. And at intermediate power (400W) the resistivity was independent of the irradiation time. Resistivity values range from 102 to 101 Ω/sq. This behavior was associated with the polymer nanocoating covering the surface of the carbon nanotubes.

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