Modulation of the internal structure and surface properties of natural and synthetic polymer matrices by graphene oxide doping

2020 ◽  
Vol 31 (7) ◽  
pp. 1562-1570
Author(s):  
Tonya D. Andreeva ◽  
András Dér ◽  
Lóránd Kelemen ◽  
Rumen Krastev ◽  
Stefka G. Taneva
Keyword(s):  
Graphene Oxide ◽  
Internal Structure ◽  
Surface Properties ◽  
Synthetic Polymer ◽  
Polymer Matrices ◽  
Natural And Synthetic

scholarly journals Experimental Investigation of the Mechanical and Surface Properties of Sub-Micron Carbon Spheres

Lubricants ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 77
Author(s):  
Abdullah A. Alazemi ◽  
Arthur D. Dysart ◽  
Vilas G. Pol
Keyword(s):  
Elastic Modulus ◽  
Internal Structure ◽  
Surface Properties ◽  
Ion Beam ◽  
Lithium Ion ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Carbon Particles ◽  
Oil Additives ◽  
Focus Ion Beam

This study investigates the mechanical and surface properties of spherical carbon particles. Sub-micrometer carbon spheres were previously used as oil additives to improve the tribological performance of oils, and as anode material to enhance the storage of rechargeable lithium-ion batteries. In the current work, internal structure and chemical analysis of these carbon sphere particles was conducted via focus ion beam scanning electron microscopy, and the results revealed that the carbon sphere particles are pure carbon particles with a solid internal structure. Atomic force microscopy (AFM) and nano-indenter were utilized to explore the mechanical properties (hardness and elastic modulus) of carbon sphere particles. The obtained results showed that the carbon spheres have an elastic modulus in the range of 10 to 42 GPa, while their hardness is in the range of 0.5 to 2.6 GPa. Besides, the AFM scans confirmed that the carbon particles are entirely separated and devoid of agglomeration. These results support the viable use of carbon sphere particles in various engineering applications.

The Protection of Rubber against Atmospheric Ozone—Cracking

1958 ◽  
Vol 31 (5) ◽  
pp. 1015-1034 ◽  
Author(s):  
B. S. Biggs
Keyword(s):  
Present Status ◽  
Synthetic Polymer ◽  
Atmospheric Ozone ◽  
Considerable Effort ◽  
Extreme Resistance ◽  
Considerable Success ◽  
Differences Of Opinion ◽  
Dynamic Exposure ◽  
Fair Degree ◽  
Natural And Synthetic

Abstract The cracking of rubber by atmospheric ozone is now a well-known phenomenon and for a number of years rubber scientists and technologists have devoted considerable effort to combating it. While the differences of opinion and the confusion of data in this work are sometimes more conspicuous than the successes, nevertheless, there has been considerable success. In spite of the existence of large areas of uncertainty, much progress has been made. A new word, “antiozonant”, has been added to the vocabulary of the rubber man. The substances so designated, together with waxes already well known, enable the compounder to protect natural and synthetic rubbers against both static and dynamic exposure to a fair degree, and this in spite of the fact, now recognized, that certain urban atmospheres may contain much higher concentrations of ozone than were formerly considered normal. In addition, the synthetic polymer chemist has made available a number of commercial rubbers which, because they are saturated, are not at all vulnerable to ozone attack, and serve in many special applications in which extreme resistance to ozone is necessary. The purpose of this paper is to review the present status of the antiozone work.

Tuning surface properties of graphene oxide quantum dots by gamma-ray irradiation

2016 ◽  
Vol 175 ◽  
pp. 88-93 ◽  
Author(s):  
Shunkai Lu ◽  
Fan Liao ◽  
Tao Wang ◽  
Lili Zhu ◽  
Mingwang Shao
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Surface Properties ◽  
Gamma Ray ◽  
Gamma Ray Irradiation ◽  
Graphene Oxide Quantum Dots
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