of ammoxidation on thermal stability of carbonaceous materials characterised
by degree of coalification other than that of brown coal (Konin mine, Poland)
or sub-bituminous coal (Sośnica mine, Poland) was studied by thermogravimetric
(TG-DTG) method. Analysis of TG-DTG curves has shown that coal samples ammoxidised
at the higher temperature show slightly lower thermal stability. It has been
established the importance of the sequence in the processes of carbonisation
and ammoxidation. Both the amount of nitrogen introduced on the surface of
studied carbonaceous materials and the thermal stability of nitrogen groups
Authors:Mark S. Romano, Sanjeev Gambhir, Joselito M. Razal, Adrian Gestos, Gordon G. Wallace, and Jun Chen
attributed to the difference in structure for these two carbonmaterials. The oxygen containing functional groups in GO diminish the integrity of the sp 2 system which lowers its thermal stability and also leads to total decomposition. Hydrazine reduction in
Summary Some aromatic based conjugated polymers having carbon-carbon triple bonds moiety were synthesized and carbonized. The polymers were efficiently carbonized by heating up to 900°C under an argon atmosphere, affording porous carbons in high yields. The polymer characteristics were appropriate to form nano-structured carbons in the pyrolytic carbonization process. The carbon materials were consisted of 2-4 nm sized graphitic crystallites and had slit-shaped micropores with ca. 0.7 nm pore width. Structural defects in the pre-carbon materials caused generation of mesopores with ca. 4 nm pore width after carbonization.
Authors:H. Nakahara, K. Sueki, W. Sato, and K. Akiyama
Radiochemical techniques have been applied in various ways to the study of fullerenes and metallofullerenes for the past several years, and they have provided invaluable information pertaining to the stability, structures, and formation of the novel carbon material. This paper reviews those experimental results that have fully shown the usefulness and uniqueness of radionuclides demonstrated in the field of fullerene science.
The covalent chemistry of carbon nanostructures has put forth a wide variety of interesting derivatives that widen their potential as functional materials. However, the synthetic procedures that have been developed to functionalize the nanostructures may require long reaction times and harsh conditions. In this paper, we study the continuous flow processing of single-wall carbon nanotubes with azomethine ylides and diazonium salts and demonstrate that this approach is effective to reduce reaction times and tune the properties of the functionalized carbon materials.
Authors:Alexandre Léonard, Aurélien Vantomme, Claire Bouvy, Nicolas Moniotte, Pascal Mariaulle, and Bao-Lian Su
A great deal of progress has recently been made in the field of ordered porous materials with uniform channel dimensions that can be adjusted over a wide range of length scales. The present paper describes the state of the art and the evolution from highly ordered mesoporous silica, aluminosilicate and pure carbon materials to our very recent success in hierarchically structured meso-macroporous carbon materials, single and binary oxides and aluminosilicates. By means of selected examples, we want to shed some light on the current strategies for the conception of these sophisticated materials. The great potential applications of these new nanomaterials emerge while their real utilisation in some expected and traditional industrial processes such as catalysis, separation, electrode materials for fuel cells and biomaterials still faces some important challenges, for example, the high price, the pelletisation and the stability (thermal, hydrothermal and water resistance). Some new perspectives, which can open the concrete applications of these materials in nanotechnology, biotechnology, information technology and medical purposes, will be prospected.
Authors:S. Cebulak, B. Smieja-Król, S. Duber, M. Misz, and A. Morawski
The paper presents the applicability of Oxyreactive Thermal Analysis (OTA) for the investigation of different kinds of carbon
matter. For comparative reasons and more precise interpretation, along with OTA some physico-chemical properties of analyzed
materials were used as the methods commonly applied for the investigations.
The carbon materials of both natural (anthracites, graphite and diamonds) and synthetic origin (active carbon, glass carbon,
expanded graphite, soot and synthetic diamonds) were investigated.
It was stated that there is close relationship between structure parameters and physico-chemical properties and the thermal
reactivity within the investigated groups of carbon matters. The results show that OTA can be accepted as a good investigative
way for such materials.
-based solid acid catalyst with high specific surface area in order to ensure good accessibility to active sites.
Porous carbonmaterials functionalized with –SO 3 H have been investigated as potential and environment-friendly solid acid catalysts [ 23