1、The terrific electrical and physical properties of carbon materials have brought greatattention of researchers and scientists studying their characteristics related to the chemical,physical and environmental conditions m

2、ainly for the purpose of aerospace, marine andelectronic industries.The aim of this project is to study the liquid adsorption behavior anddetermine the surface free energy of carbon materials by capillary rise method.The

3、 methodsused to characterize CB were BET, XRD and FTIR.BET test revealed the mesoporous structureof CB with greater specific surface area of the oven dried CB than the as received one.The XRDtest exposed the difference i

4、n spacing between the hexagonal layered planes of the two samples.From FTIR spectra test of CB the existence of the following functional groups was deduced: O-H (hydroxyl or carboxyl), C-H (aliphatic), C=C (olefin), C-O

5、(hydroxyl, ester, or ether), and O-H (residual hydroxyl groups), sulfide (C-S) and bromide(C-Br).The capillary rise method wasused to study the surface free energy and liquid adsorption behavior of four different carbonm

6、aterials: carbon black, carbon nanotubes, carbon fibers and graphene.The four probe liquidsused for the experiment were hexane and diiodomethane (non polar liquids) and water andformamide (polar liquids).Four of the carb

7、on materials were found to adsorb diiodomethanegreatly which indicates the major role of Lifshitz-van der Waals interaction component in theadsorption process.The total surface free energies of all four carbon materials

8、are contributedgreatly by the Lifshitz-van der Waals interaction component.The surface free energy of CB wasgreater for as-received sample than for oven-dried sample due to the difference in Lewis acidbase component of t

9、he two samples.Surface free energy of SWCNTs was found to be greaterthan MWCNTs and MWCNTs were found to be greatly in Lewis acid, γs+, where as SWCNTsgreatly in Lewis base, γs-.The liquid adsorption behavior of CNTs see

10、ms to be influenced by thewall structure or the surface properties because the SWCNT adsorbed polar liquid greatly and theMWCNT adsorbed non-polar liquid greatly.Furthermore, the capillary rise method has approvedthe aci

11、dic nature of carbon fibers.The uncertainty exhibited in the surface energy of graphenecould be attributed to either the few number of literature reported data (actually one) or the purityof graphene.Carbon materials are