TY  - BOOK
AU  - Asmaa Said Abdelfattah
AU  - Abeer Mohamed Salah Eldin , 
AU  - Gamal Abdelfattah , 
TI  - Thermo-Optical switching of Paraffin wax hosting graphite / 
PY  - 2016///
CY  - Cairo : 
PB  - Asmaa Said Abdelfattah , 
KW  - Hosting graphite
KW  - Paraffin wax
KW  - Thermo-Optical switching
N1  - Thesis (M.Sc.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Laser Science and Interaction; Issued also as CD
N2  - Thermo-optical switching (TOS) transmission of paraffin wax hosting a different concentration  of powder graphite or graphene was examined. Two series of graphite/paraffin wax and  graphene/paraffin wax were studied. In the composite, paraffin wax was used as a Phase  Change Material (PCM) while graphite or graphene used to enhance thermal properties of  paraffin wax. Due to a large particle size of graphite, dispersing toluene into paraffin wax  graphite composites was done. Optical microscopy was used in characterizing the  microstructure of the composite. It is found that graphene/paraffin wax and graphite/paraffin  wax dispersed in toluene have a homogenous distribution while samples without toluene have  agglomeration and precipitation at the bottom of the tube. TOS transmission versus time and  temperature are measured by using test tube with inner diameter 11 mm for bulk composites  and capillary tube with inner diameter 1 mm for spot composites. TOS properties of spots  composites were better than that of bulk composites because the small spot weight of the  sample, need a small quantity of heat to melt, that leads to fast switching. Differential Scanning  Calorimetric (DSC) was measured for the prepared samples. The melting temperature, latent  heat of fusion, heat gained and heat loss of paraffin wax-graphite or graphene composites were  determined. The melting temperature of Paraffin wax hosting graphite without toluene is close  to those of pure paraffin wax. The melting temperature, latent heat, heat gained and heat loss of  two phase transitions measured from DSC for paraffin wax-graphite composite dispersed in  toluene decrease as graphite to paraffin wax ratios increase. DSC for paraffin wax-graphene  composite shows that the temperature is affected gradually as the graphene content increase,  the sample of high graphene concentration (0.007) shows strongly decrease the melting  temperature, latent heat, and heat gained and heat lost
UR  - http://172.23.153.220/th.pdf
ER  -