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1.916 Aktuelle Fachpublikationen zum Thema temperature

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Deep-Sea Field Test of the CH4 Hydrate to CO2 Hydrate Spontaneous Conversion Hypothesis

17.10.2014 | Peter G. Brewer; Edward T. Peltzer; Peter M. Walz; Elizabeth K. Coward; Laura A. Stern; Stephen H. Kirby; John Pinkston, Energy & Fuels, 2014

We have carried out a small-scale deep-sea field test of the hypothesis that CH4 gas can be spontaneously produced from CH4 hydrate by injection of a CO2/N2 gas mixture, thereby inducing release of the encaged molecules with sequestration of the injected gas. Pressure cell studies have shown ...

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Room Temperature Growth of Ultrathin Au Nanowires with High Areal Density over Large Areas by in Situ Functionalization of Substrate

16.10.2014 | Subhajit Kundu; Annamalai Leelavathi; Giridhar Madras; N. Ravishankar, Langmuir, 2014

Although ultrathin Au nanowires (∼2 nm diameter) are expected to demonstrate several interesting properties, their extreme fragility has hampered their use in potential applications. One way to improve the stability is to grow them on substrates; however, there is no general method to grow these ...

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Fabrication of a Novel Calcium Carbonate Composite Ceramic as Bone Substitute

14.10.2014 | Fupo He, Fanwen Yang, Jixiang Zhu, Ye Peng, Xiumei Tian, Xiaoming Chen, Journal of the American Ceramic Society, 2014

The coral, whose main composition is aragonite‐type calcium carbonate, has been widely used as bone substitute in clinic. However, the study on calcium carbonate bioceramic has not been largely reported due to difficulty in sintering calcium carbonate which is liable to evidently decompose at ...

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Effects of dianhydrides on the thermal behavior of linear and crosslinked polyimides

13.10.2014 | Kwangin Kim, Taewon Yoo, Jinyoung Kim, Hyemin Ha, Haksoo Han, Journal of Applied Polymer Science, 2014

ABSTRACT To determine the thermal characteristics of linear and crosslinked polyimides (PIs), BTDA, ODPA, and 6FDA were used to synthesize polyimides. Thermal degradation temperature and glass transition temperature of the resulting PIs were measured using thermogravimetric analysis (TGA) and ...

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Fabrication and Luminescence Properties of Transparent Glass‐Ceramics Containing Eu3+‐Doped TbPO4 Nanocrystals

13.10.2014 | Fangfang Hu, Xiantao Wei, Sha Jiang, Shan Huang, Yanguang Qin, Yonghu Chen, Chang‐Kui Duan, Min Yin, Journal of the American Ceramic Society, 2014

Eu3+‐doped transparent phosphate precursor glasses and glass‐ceramics containing TbPO4 nanocrystals were successfully fabricated by a conventional high‐temperature melt‐quenching technique for the first time. The formation of TbPO4 nanocrystals was identified through X‐ray diffraction, ...

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Epoxy‐amine networks with varying epoxy polydispersity

10.10.2014 | Ian M. Mc Aninch, Giuseppe R. Palmese, Joseph L. Lenhart, John J. La Scala, Journal of Applied Polymer Science, 2014

ABSTRACT Solid, high molecular weight DGEBA‐based epoxies were blended with high purity liquid DGEBA to create several resins with equivalent epoxy equivalent weights, but with polydispersity indices (PDIs) ranging from 3 to over 10. The resins were cured with a stoichiometric amount of ...

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Energies, Vol. 7, Pages 6382-6400: Performance Evaluation of a Continuous Operation Adsorption Chiller Powered by Solar Energy Using Silica Gel and Water as the Working Pair

09.10.2014 | Hassan, Hassan Zohair, Energies, 2014

In the present study, dynamic analysis and performance evaluation of a solar-powered continuous operation adsorption chiller are introduced. The adsorption chiller uses silica gel and water as the working pair. The developed mathematical model represents the heat and mass transfer within the ...

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Size Effect of Nanoparticle Diffusion in a Polymer Melt

09.10.2014 | Christopher A. Grabowski; Ashis Mukhopadhyay, Macromolecules, 2014

We investigated the dynamics of gold nanoparticles (NPs) within an entangled liquid of poly(n-butyl methacrylate) (PBMA) above the glass transition temperature (Tg). The experiments were performed by using a modified version of fluctuation correlation spectroscopy (FCS), which measured the ...

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Ferroic Glasses: Magnetic, Polar and Strain Glass (Phys. Status Solidi B 10/2014)

07.10.2014 | Peter Entel, Raymundo Arroyave, Sebastian Fähler, Ryosuke Kainuma, Antoni Planes, Xiaobing Ren, Avadh Saxena, physica status solidi (b), 2014

The last two decades have witnessed an ever increasing interest in multiferroics, i.e. materials with more than one primary order parameter simultaneously (ferromagnetism, ferroelectricity, ferroelasticity and ferrotoroidicity). In particular the formation of multiple ferroic glasses (magnetic, ...

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Smart Polymer Nanoparticles for High-Performance Water-Borne Coatings

07.10.2014 | Susana Piçarra; Alexandra Fidalgo; Aleksander Fedorov; José M. G. Martinho; José Paulo S. Farinha, Langmuir, 2014

Poly(butyl methacrylate) nanoparticles encapsulating a silica precursor, tetraethoxysilane (TEOS), were synthesized by a two-step emulsion polymerization process. We show that TEOS remains mostly unreacted inside the nanoparticles in water but acts both as a plasticizer and cross-linker in films ...

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