A REVIEW OF PURIFICATION TECHNIQUES FOR CARBON NANOTUBES

Purification of carbon nanotubes (CNTs) is a very actively discussed topic in contemporary CNT literature. To a large extent, impurities embedded in CNTs influence the physical and chemical characteristics of the CNTs. Different purification methods yield different CNT characteristics and may be suitable for the production of different types of CNTs. Developments in the purification methods of CNTs are reviewed, and the production methods are briefly discussed and summarized. This is followed by a detailed description of the three major purification methods, viz. chemical, physical, and multi-step purification.

Download Full-text

A review of the current understanding of nanoparticles protein corona composition

Medicine and Pharmacy Reports ◽

10.15386/mpr-1756 ◽

2020 ◽

Author(s):

Pranvera Breznica ◽

Rozafa Koliqi ◽

Arlinda Daka

Keyword(s):

Protein Binding ◽

Exposure Time ◽

Protein Corona ◽

Current Understanding ◽

Biological Medium ◽

Chemical Characteristics ◽

Physical And Chemical Characteristics ◽

Different Types ◽

Physical And Chemical ◽

Universal Protein

Upon entering into the biological environments, the surface of the nanoparticles is immediately coated with proteins and form the so-called a protein corona due to which a nanoparticle changes its "synthetic" identity to a new "biological" identity. Different types of nanoparticles have different protein binding profiles, which is why they have different protein corona composition and therefore it cannot be said that there is a universal protein corona. The composition and amount of protein in the corona depends on the physical and chemical characteristics of the nanoparticles, the type of biological medium and the exposure time. Protein corona increases the diameter but also changes the composition of the surface of the nanoparticles and these changes affect biodistribution, efficacy, and toxicity of the nanoparticles.

Download Full-text

Effect on physical and chemical characteristics of activated carbon on adsorption of trimethoprim: mechanisms study

RSC Advances ◽

10.1039/c5ra17968h ◽

2015 ◽

Vol 5 (104) ◽

pp. 85187-85195 ◽

Cited By ~ 19

Author(s):

Hai Liu ◽

Jian Zhang ◽

Huu Hao Ngo ◽

Wenshan Guo ◽

Haiming Wu ◽

...

Keyword(s):

Activated Carbon ◽

Functional Groups ◽

Chemical Characteristics ◽

Porosity Structure ◽

Physical And Chemical Characteristics ◽

Different Types ◽

Physical And Chemical

Five different types of activated carbon varying in porosity, structure, and functional groups were prepared and used as adsorbents.

Download Full-text

Physical and chemical characteristics of multiwalled carbon nanotubes functionalized with aminosilane and its influence on the properties of natural rubber composites

Composites Science and Technology ◽

10.1016/j.compscitech.2006.10.021 ◽

2007 ◽

Vol 67 (9) ◽

pp. 1813-1822 ◽

Cited By ~ 243

Author(s):

A SHANMUGHARAJ ◽

J BAE ◽

K LEE ◽

W NOH ◽

S LEE ◽

...

Keyword(s):

Carbon Nanotubes ◽

Natural Rubber ◽

Multiwalled Carbon Nanotubes ◽

Chemical Characteristics ◽

Rubber Composites ◽

Multiwalled Carbon ◽

Physical And Chemical Characteristics ◽

Natural Rubber Composites ◽

Physical And Chemical

Download Full-text

Doping of Petroleum, Oil and Lubricants with Carbon Nanotubes as a Way to Improve the Performance of POL

Eurasian Chemico-Technological Journal ◽

10.18321/ectj273 ◽

2016 ◽

Vol 17 (4) ◽

pp. 295 ◽

Cited By ~ 2

Author(s):

I.V. Arkharova ◽

I.V. Zaporotskova

Keyword(s):

Carbon Nanotubes ◽

Oxidation Stability ◽

Acid Number ◽

Engine Oil ◽

Chemical Characteristics ◽

Functional Characteristics ◽

Initial State ◽

Physical And Chemical Characteristics ◽

Physical And Chemical ◽

Petroleum Oil

It is assumed that carbon nanotubes can be used as an additive, which will improve the operational properties and functional characteristics of lubricants. The doping of petroleum, oil and lubricants – semi – synthetic engine oil – with the carbon nanotubes, taken in various wt.% of additives, was carried out: 0.01; 0.1; 0.5 wt.%. The following physical and chemical characteristics were investigated: 1) viscosity of composite mix at a temperature of T = 25 °C (an initial state); 2) viscosity of composite mix after its aging at T = 160 °C on the mode of oxidation of the investigated samples of composite mix during 24 h; 3) the oxidation stability has been determined by the «acidity» and «acid number» parameters, these parameters have been carried out for the investigated samples of composite mix in an initial state and after aging. We assumed that doping of oil with carbon nanotubes will change some of oil’s properties such as an indicator of viscosity, and chemical stability. The way of development functional and operational characteristics of lubricants by doping with carbon nanotubes was suggested. Results of researches showed that doping of carbon nanotubes causes change of such physical and chemical characteristics of lubricant as viscosity, acidity and acid number, alkaline parameter. Doping of lubricant with carbon nanotubes stops oxidation process and also leads to decrease of acidity and acid number in an initial state and for a state after aging. Besides, the carbon nanotube’s presence has increased alkaline parameter after aging of composite mix that provides ability of oil to neutralize collateral sulphurous products and after aging during its exploitation. Thus, the researches proved positive influence of carbon nanotubes on the main functional characteristics of lubricants that allow us to recommend CNTs as new additives of liquid lubricant composite mixes.

Download Full-text