Microcrystalline carbon

Microcrystalline carbon was formerly called amorphous carbon. It is known in many varieties active carbons, carbon blacks, carbon... 

Neutralization Behavior of Acidic Surface Oxides on Microcrystalline Carbon"... 

Diamond is the prototype of all alijihatic compounds. One would expect on its surface free valences which are capable of surface compound formation. The surface compounds on diamond should differ somewhat in character as compared to the surface compounds on aromatic graphite or microcrystalline carbon. Apart from singly bonded carbon atoms on the edges and corners of diamond crystals... 

The neutralization behavior was different from that of oxidized microcrystalline carbon. No relationship was observed between the neutralization values with different bases as is found in Tables I and III for black microcrystalline carbon. Samples outgassed at -800° adsorbed no alkali. 

FAB is most often compared to the soft ionization method known as field desorption (FD) mass spectrometry, a technique in which the sample, deposited on an emitter wire coated with microcrystalline carbon needles, is desorbed under the influence of a high electric field gradient. As usual, bioorganic systems are best represented by both techniques (21, 33). Though FAB is the easier of the two, they are complementary, FAB being particularly suited for the case of extreme thermal lability and FD for the case of chemical lability or matrix interference. Cerny et al. (33) compare the two techniques for the study of coordination complexes and conclude FD is better for molecular-ion determination, while FAB provides better fragmentation information, which is useful in elucidating structures. 

Activated carbons Microcrystalline carbon Hydrophobic, terminating polar groups such as hydroxyl, carboxyl etc. 

Mang, D., Boehm, H.-P., Stanczyk, K., and Marsh, H. (1992). Inhibiting effect of incorporated nitrogen on the oxidation of microcrystalline carbons. Carbon, 30, 391-8. 

Synonyms carbonaceous material microcrystalline carbon Lanolin... 

Surface unsaturation in microcrystalline carbons, as measured by the fixation of bromine from aqueous solution, is thought to arise from the elimination of acidic C02-complexes, the elimination of two moles of complex generating one ethylenic bond. This is said to be a definite quantity characteristic of a carbon, and it can be enhanced by surface oxidation (treatment with potassium persulphate) followed by evacuation. 

Selective Neutralization of Acidic Surface Structures on Microcrystalline Carbons... 

CVD processes are well suited for the deposition of refractory coatings such as titanium carbides or nitrides, as well as for the fabrication of amorphous or microcrystalline carbon coatings. Conventional CVD processes normally require high temperatures, which limits the number of substrates that can be treated. To circumvent this problem a number of processes have been developed that use a plasma to enhance the reaction rate (plasma enhanced CVD). These processes combine chemical reactions typical for CVD with plasma deposition typical for PVD and therefore the two types of processes increasingly overlap. 

Other forms of carbon that you may have come across are charcoal and soot. These are forms of microcrystalline carbon. Activated charcoal, made by heating charcoal in steam at high temperatures to remove impurities, is very porous and highly adsorbent. ... 

---