scholarly journals Aqueous dispersion of single walled carbon nanotubes stabilized by PEG modified diperylene bisimide and their application as an antibacterial agent

RSC Advances ◽  
2017 ◽  
Vol 7 (42) ◽  
pp. 26125-26129 ◽  
Author(s):  
Yan Sun ◽  
Zhibo Li
Keyword(s):  
Carbon Nanotubes ◽  
Polyethylene Glycol ◽  
Antibacterial Agent ◽  
Aqueous Dispersion ◽  
Single Walled Carbon Nanotubes ◽  
Antibacterial Activities ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Polyethylene glycol modified diperylene bisimide was synthesized and applied to disperse single-walled carbon nanotubes in water. Moreover, the well-dispersed SWCNTs show excellent antibacterial activities.

scholarly journals Chemically Functionalized Water-Soluble Single-Walled Carbon Nanotubes Obstruct Vesicular/Plasmalemmal Recycling in Astrocytes Down-Stream of Calcium Ions

Cells ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1597
Author(s):  
Manoj K. Gottipati ◽  
Elena Bekyarova ◽  
Robert C. Haddon ◽  
Vladimir Parpura
Keyword(s):  
Carbon Nanotubes ◽  
Plasma Membrane ◽  
Polyethylene Glycol ◽  
Adenosine Triphosphate ◽  
Calcium Ions ◽  
Glutamate Release ◽  
Single Walled Carbon Nanotubes ◽  
Water Soluble ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

We used single-walled carbon nanotubes chemically functionalized with polyethylene glycol (SWCNT-PEG) to assess the effects of this nanomaterial on astrocytic endocytosis and exocytosis. We observed that the SWCNT-PEG do not affect the adenosine triphosphate (ATP)-evoked Ca2+ elevations in astrocytes but significantly reduce the Ca2+-dependent glutamate release. There was a significant decrease in the endocytic load of the recycling dye during constitutive and ATP-evoked recycling. Furthermore, SWCNT-PEG hampered ATP-evoked exocytotic release of the loaded recycling dye. Thus, by functionally obstructing evoked vesicular recycling, SWCNT-PEG reduced glutamate release from astrocytes via regulated exocytosis. These effects implicate SWCNT-PEG as a modulator of Ca2+-dependent exocytosis in astrocytes downstream of Ca2+, likely at the level of vesicle fusion with/pinching off the plasma membrane.

Aqueous Dispersion and Dielectrophoretic Assembly of Individual Surface-Synthesized Single-Walled Carbon Nanotubes

Langmuir ◽  
2009 ◽  
Vol 25 (14) ◽  
pp. 7778-7782 ◽  
Author(s):  
Brian R. Burg ◽  
Julian Schneider ◽  
Matthias Muoth ◽  
Lukas Durrer ◽  
Thomas Helbling ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Dispersion ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Nonlinear optical properties of single-walled carbon nanotubes/water dispersed media exposed to laser radiation with nano- and femtosecond pulse durations

2021 ◽  
Vol 23 (4) ◽  
pp. 496-506
Author(s):  
Pavel N. Vasilevsky ◽  
Mikhail S. Savelyev ◽  
Sergey A. Tereshchenko ◽  
Sergey V. Selishchev ◽  
Alexander Yu. Gerasimenko
Keyword(s):  
Carbon Nanotubes ◽  
Laser Radiation ◽  
Nonlinear Optical ◽  
Aqueous Dispersion ◽  
Single Walled Carbon Nanotubes ◽  
Optical Systems ◽  
Optical Parameters ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Intensity Laser

The constant increase in the power of laser systems and the growth of potential fields for the application of lasers make the problem of protecting sensitive elements of electro-optical systems and visual organs from high-intensity radiation an urgent issue. Modern systems are capable of generating laser radiation in a wide range of wavelengths, durations, and pulse repetition rates. High-quality protection requires the use of a universal limiter capable of attenuating laser radiation, not causing colour distortion, and having a high transmission value when exposed to low-power radiation. For this, dispersed media based on carbon nanotubes with unique physicochemical properties can be used. Such media have constant valuesof their absorption coefficient and refractive index when exposed to low-intensity laser radiation and change their properties only when the threshold value is reached.The aim of this work was the study of the nonlinear optical properties of an aqueous dispersion of single-walled carbon nanotubes exposed to nano- and femtosecond radiation. For the characterization of the studied medium, Z-scan and fixed sample location experiments were used. The optical parameters were calculated using a threshold model based on the radiation transfer equation.As a result of the experiments, it was shown that the aqueous dispersion of single-walled carbon nanotubes is capable of limiting radiation with wavelengths from the visible and near-IR ranges: nano- (532, 1064 nm) and femtosecond (810 nm). A description of nonlinear optical effects was proposed for when a medium is exposed to radiation with a nanosecond duration due to reverse saturable absorption and two-photon absorption. When the sample exposed for a femtosecond duration the main limiting effect is spatial self-phase modulation. The calculated optical parameters can be used to describe the behaviour of dispersions of carbon nanotubes when exposed to radiation with different intensities. The demonstrated effects allow us to conclude that it is promising to use the investigated media as limiters of high-intensity laser radiationin optical systems to protect light-sensitive elements.

scholarly journals Polyethylene-Glycol-Modified Single-Walled Carbon Nanotubes for Intra-Articular Delivery to Chondrocytes

ACS Nano ◽  
2014 ◽  
Vol 8 (12) ◽  
pp. 12280-12291 ◽  
Author(s):  
Cristiano Sacchetti ◽  
Ru Liu-Bryan ◽  
Andrea Magrini ◽  
Nicola Rosato ◽  
Nunzio Bottini ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polyethylene Glycol ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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