Effect of transition metal oxides on the thermal conductivity of glass

Ghoneim, N.A.; Ahmed, A. A.; Gharib, S.

doi:10.1016/0040-6031(83)80353-0

Cited by 18 publications

(5 citation statements)

References 5 publications

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“…A faster evaporation rate may create a localized dense concentration of protein at the surface of the hanging drop, resulting in a higher level of supersaturation at the surface and further extending the range of supersaturation to higher levels than that at 277 K. Another possible reason may be related to the volume change of the crystallisation drop. In a CTS programme, when the temperature of the heat source decreases, the actual temperature of the crystallisation drop will decrease faster than that of the reservoir solution due to the following reasons: a) the hanging drop's lower heat capacity compared to that of the reservoir solution, b) the higher thermal conductivity of the cover glass (~1.0 Wm -1 K -1 at room temperature) [27,28] compared to that of the plastic ware (polystyrene, ~0.14 Wm -1 K -1 at room temperature) [29] surrounding the reservoir solution, and c) sufficient thermal insulating material (the humid air, thermal conductivity ~ 0.025 Wm -1 K -1 at room temperature) [30] between the drop and the reservoir solution. As a result, when the heat source decreases in temperature, the water vapour will condensate on the colder crystallisation drop, resulting in an increase in the drop volume.…”

Section: Cts Can Induce Nucleationmentioning

confidence: 99%

Effect of temperature programmes on protein crystallisation

Wang

Yin

Zhang

et al. 2010

Cryst. Res. Technol.

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Varying the temperature has been proven to be beneficial for improving the screening efficiency of protein crystallisation, and thus a crystallisation screening strategy based on this phenomenon can be developed. Such a temperature varying strategy can be applied in practical crystallisation screening, however, there are no guidelines for determining what temperature programme should be utilised. It is therefore necessary to investigate how the temperature programme affects the crystallisation process, so as to help people design a suitable temperature programme. For this purpose, we investigated the effect of temperature programmes on the protein crystallisation (lysozyme, proteinase K, and concanavalin A) that are characterised by different solubility behaviours with respect to temperature. Judging from the reproducibility studies of protein crystallisation with different temperature programmes, we recommend using linear temperature programmes for a moderate time period (24 to 48 h) and a large temperature range according to the properties of the proteins.

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Section: Cts Can Induce Nucleationmentioning

confidence: 99%

Effect of temperature programmes on protein crystallisation

Wang

Yin

Zhang

et al. 2010

Cryst. Res. Technol.

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“…The thermal conductivity of all the HGMs samples discussed in this work, with Zn percentage 0–10, was measured using C‐THERM TCi thermal conductivity analyzer and is tabulated in Table . The thermal conductivity increased from 0.072 to 0.203 (W/m‐K) when the zinc loading increased from 0 to 10% .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of zinc-loaded hollow glass microspheres (HGMs) for hydrogen storage

Dalai

Vijayalakshmi

Shrivastava

et al. 2015

Int. J. Energy Res.

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The greatest challenge for a feasible hydrogen economy lies on the production of pure hydrogen and the materials for its storage with controlled release at ambient conditions. Hydrogen with its great abundance, high energy density and clean exhaust is a promising candidate to meet the current global challenges of fossil fuel depletion and green house gases emissions. Extensive research on hollow glass microspheres (HGMs) for hydrogen storage is being carried out world-wide, but the right material for hydrogen storage is yet underway. But many other characteristics, such as the poor thermal conductivity etc. of the HGMs, restrict the hydrogen storage capacity. In this work, we have attempted to increase the thermal conductivity of HGMs by ZnO doping. The HGMs with Zn weight percentage from 0 to 10 were prepared by flame spheroidization of amber-colored glass powder impregnated with the required amount of zinc acetate. The prepared HGMs samples were characterized using field emission-scanning electron microscope (FE-SEM), environmental SEM (ESEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques. The deposition of ZnO on the microsphere walls was observed using FE-SEM, ESEM and HRTEM which was further confirmed using the XRD and ultraviolet-visible absorption data. The hydrogen storage studies done on these samples at 200°C and 10-bar pressure for 5 h showed that the hydrogen storage increased when the Zn percentage in the sample increased from 0 to 2%. The percentage of zinc beyond 2, in the microspheres, showed a decline in the hydrogen storage capacity. The closure of the nanopores due to the ZnO nanocrystal deposition on the microsphere surface reduced the hydrogen storage capacity. The hydrogen storage capacity of HAZn2 was found 3.26 wt% for 10-bar pressure at 200°C.

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“…For example, in the case of silicate glasses, the influence of Ti, Co, Fe, Mn, Ni and Co on the thermal conductivity of a barium borosilicate glass, where it was shown that the conductivity increases with increasing atomic weight of the metallic species [22]; the addition of Cr to a lithium silicate composition in order to increase solar absorbance [23]; and the effect of various TMO additions at the 2 mol% level on the properties of a LZS glass [11]. Some studies have also been reported for non-silicate glasses.…”

Section: Discussionmentioning

confidence: 98%