Fabrication of porous hollow glass microspheres

Xie, Yuqun; McAllister, Simon D.; Edwards, Dean B.; Cheng, I. Francis

doi:10.1016/j.jpowsour.2011.07.049

Cited by 28 publications

(12 citation statements)

References 26 publications

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“…introduce PCM into cenospheres, the film covering the surface must be removed. This can be done by acid etching the cenospheres [21,22]. was quickly removed from the hot plate for cenospheres to be filtered and washed by °C water.…”

Section: Three-step Procedures To Produce Cenopcmmentioning

confidence: 99%

“…The specific gravity of cenospheres used is about 0.75 g/cm3 , thus 12 g of cenospheres corresponded to a volume of 16 mL. This made the volume ratio of solid to liquid to 1:15 in this acid treatment, which was among the range adopted by other researchers[21,22]. Occasional stirring was applied instead of continuous one to prevent the possible damage of the cenospheres during stirring.…”

mentioning

confidence: 99%

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Integrating phase change materials into concrete through microencapsulation using cenospheres

Liu

Wang

Qian

2017

Cement and Concrete Composites

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Phase change materials (PCMs) can enhance the building energy efficiency through Thermal Energy Storage and thermal regulation. Microencapsulated PCMs (MEPCMs) provide a better utilization of PCMs with building materials. This study proposes a novel method to encapsulate PCMs into cenospheres which are hollow fly ash particles generated in coal burning power plants with size ranging from a few micrometers to hundreds of micrometers. The shell of the cenosphere inherently has some small pores which are sealed by a thin layer of glass-crystalline film. By removing this film through chemical etching, these holes can be exposed, providing paths for PCMs moving into the internal void of cenospheres. A thin layer of silica is coated on

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Section: Three-step Procedures To Produce Cenopcmmentioning

confidence: 99%

mentioning

confidence: 99%

Integrating phase change materials into concrete through microencapsulation using cenospheres

Liu

Wang

Qian

2017

Cement and Concrete Composites

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“…To make the internal volume of cenospheres accessible for water, the film should be removed. This can be done by etching the cenospheres with acids [15]. Approximately 12 g of cenospheres were soaked into 250 mL of 1.0 M NH 4 F-1.2 M HCl-H 2 O solution for 2 hours with occasional stir.…”

Section: Production Of Perforated Cenospheres With Acid Etchingmentioning

confidence: 99%

“…in the perforated cenospheres. This is because alumina was not subjected to the etching action [15], while the silica and iron deposits on cenospheres were dissolved by the hydrofluoric based acid system. The dissolution resulted in about 8.77% weight loss of the cenospheres shell.…”

Section: Microstructure Of Perforated Cenospheres 260mentioning

confidence: 99%

Internal curing of high performance concrete using cenospheres

Liu

Wang

Qian

et al. 2017

Cement and Concrete Research

126

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This study explores a novel internal curing agent, perforated cenospheres. Cenospheres are hollow fly ash particles produced from coal burning power plants. The shell of the cenospheres is inherently porous that is sealed by a thin layer of glass-crystalline film. By removing this film through chemical etching, the pores on the shell can be exposed, perforating the cenospheres and providing paths for water propagating into the internal volume of cenospheres. The perforated cenosphere were found to have water absorption as high as 180 wt.%. The loaded water can be readily released from the cenospheres under high relative humidity (95%). When incorporating saturated cenospheres into cement mortar for internal curing, the autogenous shrinkage of the mortar was almost eliminated. The internal curing also improved the compressive strength of the cement mortar. All these results suggest that perforated cenospheres can be used as an efficient internal curing agent for HPC.

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“…The HGMs are easy to handle at atmospheric pressure and ambient temperature and can be packed in cartridges from which, the hydrogen gas can be released for energy applications. Moreover, HGMs are cheap, reusable and recyclable, too .…”

Section: Introductionmentioning

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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Fabrication of porous hollow glass microspheres

Cited by 28 publications

References 26 publications

Integrating phase change materials into concrete through microencapsulation using cenospheres

Integrating phase change materials into concrete through microencapsulation using cenospheres

Internal curing of high performance concrete using cenospheres

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

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