Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Rapid preparation of uniform colloidal indium hydroxide by the controlled double-jet precipitation (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 847-850 
    Details
    ISSN: 1435-1536
    Keywords: Key words Indium hydroxide ; colloidal ; indium hydroxide ; rod-like ; controlled double-jet precipitation ; monodispersed indium hydroxide ; precipitation of indium hydroxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The synthesis of uniform colloidal rod-like In(OH)3 particles from relatively concentrated solutions of InCl3 (0.1 mol dm-3) in short reaction time (〈15 min) by the controlled double-jet precipitation (CDJP) technique is described. The effects of the molar ratio of [NH4OH]/[InCl3], temperature, concentration of the reactants, and reaction time on the size and shape of the final products are investigated. It is found that such In(OH)3 particles are formed by aggregation of nanosize subunits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050320
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Kinetic Analysis of Solid State Reactions by Means of Stepwise Isothermal Analysis (SIA) and Constant Rate Thermal Analysis (CRTA) A comparative study (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 389-396 
    Details
    ISSN: 1572-8943
    Keywords: Constant Rate Thermal Analysis (CRTA) ; solid state kinetics ; Stepwise Isothermal Analysis (SIA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results obtained in this work point out that both SIA and CRTA traces, simulated assuming the same values of the reaction rate, are identical provided that either 'n order’ or diffusion controlled kinetics are concerned. The α-T CRTA plots of solid state reactions fitting an Avrami-Erofeev kinetic model show that the temperature decreases with increasing α until reaching a minimum at a value of the reacted fraction α = αmin characteristic of the Avrami-Erofeev exponent. The shapes of the corresponding SIA diagrams are quite different and a very long isothermal step is obtained. Moreover, the reaction rate is not maintained constant during the isothermal period but it shows a maximum at a value of α depending on the Avrami-Erofeev coefficient. It is important to point out that this αmax value agrees with the corresponding αmin calculated from a CRTA curve by assuming the same Avrami-Erofeev exponent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010172821020
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Characterisation of α-FeOOH Grinding Products Using Simultaneous DTA and TG/DTG Coupled with MS (1998)
    Springer
    Journal of thermal analysis and calorimetry 53 (1998), S. 509-517 
    Details
    ISSN: 1572-8943
    Keywords: DTA ; EGA ; goethity hematite ; grinding ; mechanochemical decomposition ; thermal behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Effects induced by grinding in synthetic goethite samples were studied. The products of α-FeOOH grinding were characterised by means of DTA, TG/DTG coupled with EGA (Mass spectrometry detection), powder X-ray diffraction analysis, and surface area determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010197510542
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The Accuracy of Senum and Yang's Approximations to the Arrhenius Integral (2000)
    Springer
    Journal of thermal analysis and calorimetry 60 (2000), S. 909-915 
    Details
    ISSN: 1572-8943
    Keywords: Arrhenius integral ; Senum and Young's approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The accuracy of the integral of the Arrhenius equation, as determined from the 1st to the 4th degree rational approximation proposed by Senum and Yang, has been calculated. The precision of the 5th to 8th rational approximations, here proposed for the first time, has also been analyzed. It has been concluded that the accuracy increases by increasing the order of the rational approximation. It has been shown that these approximations to the Arrhenius equation integral would allow an accuracy better than 10−8 % in the E/RT range generally observed for solid state reactions. Moreover, it has been demonstrated that errors closed to 10−2 % can be obtained even for E/RT=1, provided that high enough degrees of rational approximation have been used. Thus, it would be reasonable to assume that high degree rational approximations for the Arrhenius integral could be used for the kinetic analysis of processes, like adsorption or desorption of gases on solid surfaces, which can take place at low temperatures with very low values of E/RT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010115926340
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Constant Rate Thermal Analysis (CRTA) as a Tool for the Synthesis of Materials with Controlled Texture and Structure (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1447-1452 
    Details
    ISSN: 1572-8943
    Keywords: CRTA ; material synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Some examples of the use of the CRTA method for the synthesis of materials with controlled texture and structure are given. BaTiO3 has been obtained from the thermal decomposition of Barium Titanyl Oxalate (BTO) and Barium Titanyl Citrate (BTC) by controlling the reaction temperature in such a way that the partial pressure of the gases generated in the reaction was maintained constant at a value close to 10-2 mbar. It has been shown that this method allows getting BaTiO3 with crystal sizes considerably lower than those obtained by decomposing the same precursors by conventional methods. This small crystal sizes lead to the stabilisation of the metastable cubic phase with regards to the tetragonal phase. It has been also shown that the control of the CO generated in the carbothermal reduction of silica allows tailoring the phase composition of the silicon nitride obtained as final product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010187313720
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Use of Emanation Thermal Analysis in Characterisation of Nanosized Hematite Prepared by Dry Grinding of Goethite (2000)
    Springer
    Journal of thermal analysis and calorimetry 60 (2000), S. 997-1007 
    Details
    ISSN: 1572-8943
    Keywords: emanation thermal analysis (ETA) ; goethite ; grinding ; mechanochemical decomposition ; nanosized hematite particles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Hematite nanoparticles of narrow size distribution were prepared by grinding of goethite. Intermediate and final products of grinding were characterised by different techniques, including the less-common emanation thermal analysis (ETA). ETA was shown to be a useful technique for characterising processes of surface annealing, initial sintering and growth of hematite particles under in situ conditions of thermal treatment. A good agreement was found between results of ETA, TG, XRD, IR spectrometry, transmission electron microscopy and scanning electron microscopy, used for characterisation of thermal behaviour of the goethite samples ground for varying time (0–70 h).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010180313136
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...