16 research outputs found
Additivity of Thermodynamic Properties of Organic Compounds in the Crystalline State. 3. Heat Capacities and Related Properties of Urea Phenyl Derivatives
No full textCalculation of Pseudorotational Moments of Inertia of Cyclopentane Derivatives Using Molecular Mechanics Method
No full textThe Kinetics of Thermal Decomposition of 1-Butyl-3-methylimidazolium Hexafluorophosphate
No full textAdditivity of Thermodynamic Properties of Organic Compounds in Crystalline State. 2. Heat Capacities and Enthalpies of Phase Transition of Alkyl Derivatives of Urea in Crystalline State
No full textThermodynamic Properties and Similarity of Stacked-Cup Multiwall Carbon Nanotubes and Graphite
No full textThe heat capacity
of stacked-cup multiwall carbon nanotubes (MWCNTs)
was measured in an adiabatic calorimeter over the temperature range
of (5 to 370) K. Results are compared with literature data on various
samples of CNTs and other carbon allotropes. The relatively large
scatter of the heat capacity data for CNTs is discussed. The energy
of combustion for MWCNTs was determined by combustion calorimetry,
and the enthalpy of formation was found to be Δ<sub>f</sub><i>H</i>°<sub>m</sub> = (0.6 ± 0.9) kJ·mol<sup>–1</sup>. It is demonstrated that the thermodynamic properties of MWCNTs
at <i>T</i> > 200 K are close to those of graphite. Equilibria
of the synthesis of MWCNTs were considered
Physicochemical Properties of Imidazolium-Based Ionic Nanofluids: Density, Heat Capacity, and Enthalpy of Formation
No full textThe heat capacity
of ionic nanofluids (INF) of stacked-cup multiwalled
carbon nanotubes (MWCNT) and [C<sub>4</sub>mim]ÂBF<sub>4</sub> and
[C<sub>4</sub>mim]ÂPF<sub>6</sub> ionic liquids (IL) as well as their
components was measured over the temperature range of 80–370
K. The specific heat capacity of INF was found be an additive quantity
of specific heat capacities of the components. The temperatures of
glass transition and fusion of IL in INF did not observably change
compared to pure IL. The enthalpy of formation of ([C<sub>4</sub>mim]ÂBF<sub>4</sub>+MWCNT) INF from its components was found to be negligible
compared to the uncertainty of the measurements. All these facts confirm
liophobic nature of the studied INF and provide the opportunity to
predict thermodynamic properties of similar INF from the data on individual
components. The apparent density of the studied MWCNT in INF is lower
than those in their unstable dispersions with ionic and molecular
liquids due to the high viscosity of INF not allowing penetration
of ions into MWCNT and removal of gases from inner parts of MWCNT.
The structural parameters of the studied MWCNT were estimated from
the obtained density data
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Thermodynamic Properties of Organic Compounds. 2. Combustion and Sublimation Enthalpies of 2,4,6-Trimethylbenzonitrile N-Oxide
No full textArticle discussing thermodynamic properties of organic compounds and combustion and sublimation enthalpies of 2,4,6-trimethylbenzonitrile N-oxide
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Thermodynamic Properties of Organic Compounds. 3. Sublimation Enthalpy and Heat Capacities of 2,4,6-Trimethylbenzonitrile N-oxide
No full textArticle discussing thermodynamic properties of organic compounds and sublimation enthalpy and heat capacities of 2,4,6-trimethylbenzonitrile N-oxide
Thermodynamic Properties of Plant Biomass Components. Heat Capacity, Combustion Energy, and Gasification Equilibria of Lignin
No full textHeat capacities and enthalpies of formation were determined
for
two samples of lignin obtained from rape straw by different methods.
The obtained experimental results allowed us to obtain the values
of thermodynamic properties for this material. The equilibria of the
processes of lignin gasification were considered. The adiabatic temperatures
of the gasification and energetic characteristics of the products
of lignin thermolysis were evaluated
