Combined effect of cetyltrimethylammonium bromide and laponite platelets on colloidal stability of carbon nanotubes in aqueous suspensions

An efficient doxorubicin (DOX) drug delivery system with specificity against tumor cells was developed, based on multi-walled carbon nanotubes (MWCNTs) functionalized with guanidinylated dendritic molecular transporters. Acid-treated MWCNTs (oxCNTs) interacted both electrostatically and through hydrogen bonding and van der Waals attraction forces with guanidinylated derivatives of 5000 and 25,000 Da molecular weight hyperbranched polyethyleneimine (GPEI5K and GPEI25K). Chemical characterization of these GPEI-functionalized oxCNTs revealed successful decoration with GPEIs all over the oxCNTs sidewalls, which, due to the presence of guanidinium groups, gave them aqueous compatibility and, thus, exceptional colloidal stability. These GPEI-functionalized CNTs were subsequently loaded with DOX for selective anticancer activity, yielding systems of high DOX loading, up to 99.5% encapsulation efficiency, while the DOX-loaded systems exhibited pH-triggered release and higher therapeutic efficacy compared to that of free DOX. Most importantly, the oxCNTs@GPEI5K-DOX system caused high and selective toxicity against cancer cells in a non-apoptotic, fast and catastrophic manner that cancer cells cannot recover from. Therefore, the oxCNTs@GPEI5K nanocarrier was found to be a potent and efficient nanoscale DOX delivery system, exhibiting high selectivity against cancerous cells, thus constituting a promising candidate for cancer therapy.

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Environmentally Induced Changes of Commercial Carbon Nanotubes in Aqueous Suspensions. Adaptive Behavior of Bacteria in Biofilms

ACS Omega ◽

10.1021/acsomega.0c05114 ◽

2021 ◽

Vol 6 (8) ◽

pp. 5197-5208

Author(s):

Damián Rodríguez Sartori ◽

Marcos Bertuola ◽

Alejandro Miñán ◽

Eduardo Gonik ◽

Mónica C. Gonzalez ◽

...

Keyword(s):

Carbon Nanotubes ◽

Adaptive Behavior ◽

Aqueous Suspensions ◽

Commercial Carbon ◽

Induced Changes

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Combined effect of expanded graphite and multiwall carbon nanotubes on the thermo mechanical, morphological as well as electrical conductivity of in situ bulk polymerized polystyrene composites

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2013.10.007 ◽

2014 ◽

Vol 56 ◽

pp. 181-191 ◽

Cited By ~ 29

Author(s):

Goutam Hatui ◽

Pallab Bhattacharya ◽

Sumanta Sahoo ◽

Saptarshi Dhibar ◽

Chapal Kumar Das

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Multiwall Carbon Nanotubes ◽

Expanded Graphite ◽

Combined Effect ◽

Multiwall Carbon

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Interaction of aqueous suspensions of single-walled oxidized carbon nanotubes with inorganic and organic electrolytes

Journal of Molecular Liquids ◽

10.1016/j.molliq.2021.117948 ◽

2021 ◽

pp. 117948

Author(s):

Anna N. Laguta ◽

Nikolay O. Mchedlov-Petrossyan ◽

Sergey I. Bogatyrenko ◽

Sergiy M. Kovalenko ◽

Natalya D. Bunyatyan ◽

...

Keyword(s):

Carbon Nanotubes ◽

Organic Electrolytes ◽

Aqueous Suspensions ◽

Oxidized Carbon ◽

Oxidized Carbon Nanotubes ◽

Inorganic And Organic

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Colloidal Stability of Aqueous Suspensions of Polymer-Coated Iron Oxide Nanorods: Implications for Biomedical Applications

ACS Applied Nano Materials ◽

10.1021/acsanm.8b01558 ◽

2018 ◽

Vol 1 (12) ◽

pp. 6760-6772 ◽

Cited By ~ 5

Author(s):

J. A. Marins ◽

T. Montagnon ◽

H. Ezzaier ◽

Ch. Hurel ◽

O. Sandre ◽

...

Keyword(s):

Iron Oxide ◽

Biomedical Applications ◽

Colloidal Stability ◽

Aqueous Suspensions ◽

Oxide Nanorods

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Effect of Surface Modification of Multiwall Carbon Nanotubes on their Electrical and Surface Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.636-637.676 ◽

2010 ◽

Vol 636-637 ◽

pp. 676-681 ◽

Cited By ~ 3

Author(s):

M. Omastová ◽

M. Mičušík ◽

Pavol Fedorko ◽

M.M. Chehimi ◽

J. Pionteck

Keyword(s):

Carbon Nanotubes ◽

Surface Properties ◽

Photoelectron Spectroscopy ◽

Cetyltrimethylammonium Bromide ◽

Multiwall Carbon Nanotubes ◽

Dodecylbenzenesulfonic Acid ◽

Molar Ratios ◽

Electrical Conductivities ◽

Multiwall Carbon ◽

Effect Of Surface

The surface of multiwall carbon nanotubes (CNT) was modified by non-covalent approach. Various types of surfactants, an anionic surfactant - dodecylbenzenesulfonic acid, an cationic surfactant - cetyltrimethylammonium bromide and their combination with different molar ratios were used for modification. Different power of ultrasound, 64 or 400 W was used to evaluate its influence on the properties of prepared composites. The electrical conductivities of unmodified CNT, particles treated by ultrasound, and CNT modified with surfactants were measured. The surface properties of modified particles were determined by X-ray photoelectron spectroscopy and scanning electron microscopy. Thermogravimetric analysis was used to confirm the presence and to evaluate the quantity of surfactants in the modified CNT.

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