New method for preparing graphene by peeling graphite and facile fabrication of bulk Bi0.45Sb1.55Te3.02/graphene composites with dense texture and high ZT

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42492-42499 ◽  
Author(s):  
Jingying Cui ◽  
Shanming Li ◽  
Qing Hao ◽  
Huaizhou Zhao ◽  
Hongbo Zhao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
New Method ◽  
Graphene Sheets ◽  
Facile Fabrication

The incorporated graphene sheets acted as a growth template and result in dense texture with laminates, an increased Seebeck efficient, a decreased thermal conductivity, and therefore a 25%-enhanced-ZT in pressure direction.

scholarly journals New Method for Diagnostic of Heat Engineering and Mechanical Properties of Cellular Concrete

2019 ◽  
Vol 9 (1) ◽  
pp. 6885-6887
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Information Technology ◽  
Optical Method ◽  
New Method ◽  
Modern Approach ◽  
Heat Engineering ◽  
Aerated Concrete ◽  
Pore Arrangement ◽  
Cellular Concrete

The article presents the results of studies assessing the structure of cellular concrete using a photo-optical method based on the use of a modern approach from the standpoint of information technology. Based on the photo-optical method, a reverse formulation of the problem is also possible: on the basis of a given percentage of porosity of the material, obtain the most optimal pore arrangement (type of packaging) that meets the specified strength and thermal conductivity of aerated concrete. Having a specific type of image of aerated concrete obtained as a result of modeling, otherwise, a specific type of packing of pores of certain sizes that meets the required (specified) characteristics, then, we can set the technological task of obtaining it.

Enhanced thermal conductivity for polyimide composites with a three-dimensional silicon carbide nanowire@graphene sheets filler

2015 ◽  
Vol 3 (9) ◽  
pp. 4884-4891 ◽  
Author(s):  
Wen Dai ◽  
Jinhong Yu ◽  
Yi Wang ◽  
Yingze Song ◽  
Fakhr E. Alam ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Three Dimensional ◽  
Graphene Sheets ◽  
Polyimide Composites ◽  
Polyimide Matrix ◽  
Enhanced Thermal Conductivity

3DSG incorporated into a polyimide matrix greatly enhanced its thermal conductivity (up to 2.63 W m−1 K−1), approximately a 10-fold enhancement in comparison with that of neat polyimide.

A New Method to Measure Prandtl Number and Thermal Conductivity of Fluids

1957 ◽  
Vol 24 (1) ◽  
pp. 25-28
Author(s):  
E. R. G. Eckert ◽  
T. F. Irvine
Keyword(s):  
Thermal Conductivity ◽  
Boundary Layer ◽  
Prandtl Number ◽  
High Velocity ◽  
Atmospheric Pressure ◽  
New Method ◽  
Test Results ◽  
Test Setup ◽  
Velocity Boundary Layer ◽  
Layer Flow

Abstract A new method is described by which the Prandtl number and indirectly the thermal conductivity of fluids can be measured. The method is based on the fact that a well-established, unique relation exists between the Prandtl number and the recovery factor for laminar high-velocity boundary-layer flow. The test setup is described which has been devised for such measurements, and test results are presented for air at atmospheric pressure and temperatures between 60 and 350 F.

Preparation and Characterization of In Situ Nanocomposites of Graphene Nanosheets/Polyurethane

2019 ◽  
Vol 814 ◽  
pp. 90-95 ◽  
Author(s):  
Guang Lei Lv ◽  
Yuan Yuan Li ◽  
Chen Fei ◽  
Zhi Hao Shan ◽  
Jing Gan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Graphene Nanosheets ◽  
Graphene Sheets ◽  
Microstructural Properties ◽  
Wear Performance ◽  
Polyurethane Composites

Graphene nanosheets/polyurethane (GNS/PU) was prepared in situ by polymerization technique for the manufacture of PU safety shoes soles. The graphene nanosheets/polyurethane composites were characterized for their mechanical properties, thermal conductivity and abrasion resistance, and comparison is made with those of the neat polyurethane. The microstructural properties of GNS/PU were characterized by SEM. The results show that with the increase of the amount of graphene within the range of weight-percentages analyzed, the tensile strength of the composites gradually increases. The tensile strength of the GNS/PU composites increased to 64.14 MPa with 2 wt% GNS, compared with 55.1 MPa for neat PU. When the graphene sheets reached 2 wt%, the abrasion volume reached 71 mm3. Compared with the pure PU, the wear performance of GNS/PU composites was significantly improved.

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