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Presentation to give on Samsonov 2012 conference

Oleksandr Vasiliev

on 24 January 2013

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Transcript of smsnv2012_carbonhc

The heat capacity of hexagonal and cubic carbon nanoforms Oleksandr Vasiliev National Technical University of Ukraine
"Kyiv Polytechnic Institute"
Chemical Technology Faculty
Department of General and Inorganic Chemistry Valeriy Muratov Institute for Problems of Material Sciences
NAS of Ukraine
Department of Thin Inorganic Synthesis,
Thermodynamics and Kinetics of Heterogeneous Processes Introduction Thermodynamics of nanoforms is modest, but very important part of nanoscience "If I have seen further,
it is only by standing on
the shoulders of Giants."
Sir Isaac Newton Search keywords (every time only one of the listed keywords was used with "nano" ): "nano" and "synthesis", "production", "application", "properties"
"nano" and "thermodynamics", "heat capacity", "specific heat", "enthalpy", "entropy" Fields of nanoscience (values are in millions of search results) Thermodynamics Synthesis
Production Application Properties Thermodynamics greatly influences all the other fields of nanoscience central experimental quantity is... ...Heat capacity
Cp Enthalpy Entropy Reduced Gibbs Energy Other Properties
Thermal conductivity
Electric conductivity Are thermodynamic properties of bulk and nano forms of substances interchangeable? Heat capacity excess Experimentally evident No heat capacity excess Experimentally evident Internal energy at low T ? thermodynamic properties bulk form nano form Specimen
purity Phisical-chemical
state of atoms Influence of the structure ? ? ? on the heat capacity of nanoforms has been poorly regarded previously includes many other important questions (like specimen purity and phys.-chem. state of atoms) Materials, Experimental and Results Carbon nanoforms are best suited for the study Comparison basis is a result of rigorous calculations and experimental study of bulk forms Transition to nanostate influences the heat capacity of MWNT and nanodiamond Carbon nanoforms' heat capacity specifics are structure dependent Carbon Graphite Diamond Hexagonal Cubic Fullerens Graphen Nanotubes
(MWNTs) Detonation
nanodiamond Shock ND CVD ND Specific surface area: Chemical composition, % by mass TEM Oxidation carboximetry Chemical composition, % by mass X-ray diffraction pattern TEM Average particle size: Specific surface area: 4.5 nm Conclusions The problem of interchangeable use of thermodynamic properties of bulk and nano forms are of great fundamental importance Carbon nanoforms are best suited for studying the specifics of nanoforms' thermodynamic properties, as they are numerous and of different structure Effects of transition into nanostate on heat capacity of cubic and hexagonal carbon differ: detonation nanodiamond shows significant deviations from bulk diamond, while multiwalled carbon nanotubes do not Thank You Very Much! this work The heat capacity of MWNTs Jorge 2010, DOI: 10.1016/j.carbon.2009.09.073 Mizel 1999, DOI: 10.1103/PhysRevB.60.3264 Masarapu 2005, DOI: 10.1088/0957-4484/16/9/013 Yi 1999, DOI: 10.1103/PhysRevB.59.R9015 graphite (calculation) The heat capacity of detonation nanodiamond Surface area
influence Gaseous impurities
influence Vacuum thermal treatment (VTT) X-ray before VTT X-ray after VTT Gaseous impurities content Heat capacities of diamond,
graphene and graphite were
calculated from respective PhDOSs
and elastic properties Experimental installation was certified for work with carbon materials using graphite and diamond Our experimental findings support hypothesis of different change in physical-chemical state of atoms during the transition to nanostate for different structure type Adiga 2011, DOI: 10.1021/jp207424m
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