Showing papers in "Thermochimica Acta in 2007"

TL;DR: In this article, various nanoparticles such as multi-walled carbon nanotube (MWCNT), fullerene, copper oxide, and silicon dioxide have been used to produce nanofluids for enhancing thermal conductivity and lubricity.

TL;DR: In this article, a detailed examination of factors influencing thermal stability, including the role of chemical constitution of organic modifier, composition and structure of nanocomposites, and mechanisms of improvement of thermal stability in polymer/montmorillonite composites, is presented.

TL;DR: In this paper, the thermal conductivities of several nanofluids were consistently greater than the theoretical predictions obtained from existing models, and mechanisms for thermal conductivity enhancement were discussed, where Mono-type nanoparticle suspensions showed the greatest enhancement in thermal conductive, among which the enhancement with CuNPs was the highest.

TL;DR: In this paper, the melting behavior of aluminum nanoparticles having an oxide passivation layer was examined using a differential scanning calorimetry (DSC) and the melting point depression, both corrected and uncorrected for the effects of the oxide shell, was linear with the reciprocal of particle radius.

TL;DR: In this paper, a cell disrupter generating high power pulses is used for improving the dispersion of nanoparticles, and the transient hot wire method was used for the measurement of thermal conductivity.

TL;DR: In this article, a manufacturing technique based on in situ polymerization is proposed to accomplish the microencapsulation of phase change materials (PCMs) that can ultimately be used in different textile applications, incorporating such products into the multi-component non-conventional fabrics.

TL;DR: In this article, the thermal decomposition of Ni(NO3)2·6H2O (1), Ca( NO3) 2·4H 2O (2) and nitryl/nitrosyl nitrato nickelate(II), NO2/NO[Ni(NO 3)3] (3), was investigated by thermogravimetric measurements with quasi-isothermal conditions.

TL;DR: In this paper, the basic changes in thermal behavior of different polymeric matrixes (e.g. polyolefins, polyamides, polyvinyl chloride) upon addition of montmorillonite have been described.

TL;DR: In this article, thermal decomposition products evolved during the degradation of several commercially available organoclays (Cloisites TM Na +, 10A, 15A, 20A, 25A, 93A and 30B) were investigated.

TL;DR: In this paper, an ab initio quantum chemical calculations (DFT-B3LYP) was used to predict thermal decomposition mechanisms, temperatures and the activation energies of the thermal breakdown reactions.

TL;DR: The exoskeletons of the American lobster Homarus americanus and of the edible crab Cancer pagurus were analyzed with structural and chemical methods as mentioned in this paper, showing that the shell of the lobster is less mineralized (and therefore lighter and less hard) than that of the crab.

TL;DR: In this article, the pyrolysis combustion flow calorimeter (PCFC) was used as a tool for assessing the flammability of a polycarbonate (bisphenol A)/acrylonitrile-butadiene-styrene (PC/ABS) blend containing different flame retardants and additives.

TL;DR: In this paper, the thermal conductivity of boron nitride (BN) reinforced high density polyethylene (HDPE) composites was investigated under a special dispersion state of BN particles in HDPE, i.e., BNs particles surrounding HDPE matrix particles.

TL;DR: In this paper, the authors quantitatively measured the heat capacity of pure dry silk fibroin films cast from water solution, and containing bound water, and found that the total solid specific heat capacity is in good agreement with the calculated solid baseline in the low-temperature region below about 240 K.

TL;DR: In this paper, the thermal degradation of chitosan, degree of acetylation 12%, was studied by using TG in nitrogen atmosphere in isothermal and dynamic conditions, with an apparent activation energy of 149.6 and 138.5 kJ/mol, respectively.

TL;DR: In this article, two paraffin waxes acting as phase change materials were directly incorporated into the polyurethane foams at different ratios, and polymerization modified by means of n-alkane addition could be achieved without any adverse effect.

TL;DR: In this article, the junction temperatures of high power LED arrays with and without heat pipe at the same air velocity of 7 m/s were reported to be 87.6 °C and 63.3 °C, respectively.

TL;DR: In this article, the authors analyzed the dehydration kinetics of equilibrium swollen poly (acrylic acid) hydrogel by both model-fitting and model-free approaches and found that the values of Arrhenius parameters obtained in such a way are in fact an average that does not reflect changes in the reaction mechanism and kinetics with the extent of conversion.

TL;DR: In this article, the thermal behavior of a mixture containing an ammonium polyphosphate based compound (AP760) and zinc borate (ZB) was investigated by thermogravimetry.

TL;DR: In this article, the activation energies (E a ) were obtained from these methods and compared, and it was found that the values of E a for modified epoxy hybrids are higher than that of pure epoxy.

TL;DR: In this article, the NETZSCH LFA 457 MicroFlash was developed for measurement of the thermophysical properties (thermal diffusivity, specific heat, thermal conductivity).

TL;DR: In this article, a structural model of a grafting process of the interlayer [Al(OH)4]− tetrahedron onto hydroxylated octahedrons of aluminum-oxide polyhedrons has been proposed in order to explain observed loss of one water molecule, shrinkage of interlayer spacing and qualitative changes of FT-IR spectra.

TL;DR: In this article, the effect of EG content and preparation methods on thermal conductivity of composites were investigated, and it was found that with increasing EG, the thermal conductivities increased, and solution intercalation method showed better effect than melt mixing method in improving the thermalconductivity of composite.

TL;DR: In this article, the authors investigated polyvinylidene fluoride (PVDF) in non-isothermal mode at ultra-high cooling rates ranging between 30-3000 k/s as well as at constant temperatures after quenching at 6000k/s.

TL;DR: In this paper, the kinetic and thermodynamic characterization of a non-catalyzed reaction between poly(hexamethylene carbonate- co-caprolactone)diol (PHMC- co -PCL) with a stochastic functional concentration, using both isothermal and dynamic differential scanning calorimetry, DSC, as well as Fourier transform infrared spectroscopy, FT-IR, was presented.

TL;DR: In this article, a twin-screw co-rotating extruder was used to extract isotactic polypropylene (iPP) and carbon nanoparticles (CN) from carbon black nanoparticles.

TL;DR: In this article, the crystallization behavior of poly(ethylene oxide) (PEO)/multi-walled carbon nanotubes (MWCNT) and PEO/chemically modified MWCNT nanocomposites were investigated by means of differential scanning calorimetry.

TL;DR: In this article, a review about the application of calorimetry to study soil properties and its metabolism is presented, and the contributions of these techniques to different topics in soil research are described and their importance for the environmental concern is discussed in the light of this new era.

TL;DR: In this paper, the occupancy of cis and trans positions of the dioctahedral smectites was investigated by simultaneous thermal analysis, and limits for the proportion of cis - and trans -vacancies were defined resulting in four classes (cv, cv/tv; tv/cv; tv) for montmorillonites with respect to the distribution of the octahedral cations.

TL;DR: In this paper, thermal analysis of three kinds of ceramic package designs for high power LEDs was made by transient thermal measurement and thermal simulation using the Finite Volume Method, and the results showed that the junction temperature decreases with the effective contact area ratio in the LED packages.