Amorphous Carbon Based Nanofluids for Direct Radiative Absorption in Solar Thermal Concentrators

2021 ◽  
Author(s):  
Anurag Pramanik ◽  
Harjit Singh ◽  
Ram Chandra ◽  
Virendra Kumar Vijay ◽  
S Suresh
Keyword(s):  
Amorphous Carbon ◽  
Solar Thermal ◽  
Radiative Absorption ◽  
Carbon Based

Potential Heat Transfer Fluids (Nanofluids) for Direct Volumetric Absorption-Based Solar Thermal Systems

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Vikrant Khullar ◽  
Vishal Bhalla ◽  
Himanshu Tyagi
Keyword(s):  
Heat Transfer ◽  
Optical Properties ◽  
Amorphous Carbon ◽  
Solar Thermal ◽  
Solar Irradiation ◽  
Working Fluid ◽  
Distilled Water ◽  
Thermal Systems ◽  
Nanoparticle Dispersions ◽  
Carbon Based

Nanoparticle dispersions or more popularly “nanofluids” have been extensively researched for their candidature as working fluid in direct-volumetric-absorption solar thermal systems. Flexibility in carving out desired thermophysical and optical properties has lend the nanofluids to be engineered for solar thermal and photovoltaic applications. The key feature which delineates nanofluid-based direct absorption volumetric systems from their surface absorption counterparts is that here the working fluid actively (directly) interacts with the solar irradiation and hence enhances the overall heat transfer of the system. In this work, a host of nanoparticle materials have been evaluated for their solar-weighted absorptivity and heat transfer enhancements relative to the basefluid. It has been found that solar-weighted absorptivity is the key feature that makes nanoparticle dispersions suitable for solar thermal applications (maximum enhancement being for the case of amorphous carbon nanoparticles). Subsequently, thermal conductivity measurements reveal that enhancements on the order of 1–5% could only be achieved through addition of nanoparticles into the basefluid. Furthermore, dynamic light scattering (DLS) and optical measurements (carried out for as prepared, 5 h old and 24 h old samples) reveal that nanoclustering and hence soft agglomeration does happen but it does not have significant impact on optical properties of the nanoparticles. Finally, as a proof-of-concept experiment, a parabolic trough collector employing the amorphous carbon-based nanofluid and distilled water has been tested under the sun. These experiments have been carried out at no flow condition so that appreciable temperatures could be reached in less time. It was found that for the same exposure time, increase in the temperature of amorphous carbon based nanofluid is approximately three times higher as compared to that in the case of distilled water.

Self-encapsulating Ag nanospheres in amorphous carbon: A novel ultrathin selective absorber for flexible solar-thermal conversion

2021 ◽  
Author(s):  
Wei Li ◽  
Cheng-Bing Wang ◽  
Jinzhu Yang ◽  
Jiulong wang ◽  
Wenhe Zhang
Keyword(s):  
Energy Conversion ◽  
Amorphous Carbon ◽  
Thermal Conversion ◽  
Solar Thermal ◽  
Solar Absorbers ◽  
Energy Conversion Devices

Solar-thermal conversion is very appealing for various applications, especially in wearable energy conversion devices. Despite various solar absorbers having been developed, they are usually suitable only for rigid substrates. Hence...

Piezoresistive properties of amorphous carbon based nanocomposite thin films deposited by plasma assisted methods

2013 ◽  
Vol 538 ◽  
pp. 78-84 ◽  
Author(s):  
Sigitas Tamulevičius ◽  
Šarūnas Meškinis ◽  
Kęstutis Šlapikas ◽  
Andrius Vasiliauskas ◽  
Rimantas Gudaitis ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Nanocomposite Thin Films ◽  
Carbon Based

scholarly journals Structure and tribo-mechanical properties of Si- and W-containing amorphous carbon based multilayers

2021 ◽  
Vol 5 ◽  
pp. 100105
Author(s):  
Wolfgang Tillmann ◽  
Nelson Filipe Lopes Dias ◽  
Dominic Stangier ◽  
Serguei Matveev ◽  
Carl-Arne Thomann ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Amorphous Carbon ◽  
Carbon Based

Thermal-assisted electroforming enables performance improvement by suppressing the overshoot current in amorphous carbon-based electrochemical metallization memory

2021 ◽  
Vol 119 (14) ◽  
pp. 143505
Author(s):  
Qiaoling Tian ◽  
Xiaoning Zhao ◽  
Xiaohan Zhang ◽  
Huai Lin ◽  
Di Wang ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Amorphous Carbon ◽  
Carbon Based

DEVELOPMENT OF CARBON-BASED COATING OF EXTREMELY HIGH TOUGHNESS WITH GOOD HARDNESS

2004 ◽  
Vol 03 (04n05) ◽  
pp. 571-578 ◽  
Author(s):  
S. ZHANG ◽  
X. L. BUI ◽  
Y. FU ◽  
H. DU
Keyword(s):  
Residual Stress ◽  
Contact Angle ◽  
Amorphous Carbon ◽  
High Hardness ◽  
Hydrophobic Surface ◽  
Nanocomposite Coating ◽  
High Toughness ◽  
Surface Contact ◽  
Surface Contact Angle ◽  
Carbon Based

Metallic Al was doped into amorphous carbon (a-C) to form a matrix of a-C(Al) of very low residual stress and high toughness at the expense of some hardness. Nanocrystallites of TiC (nc-TiC) of a few nanometers in size were embedded in this matrix to bring back the hardness. The nanocomposite coating of nc-TiC/a-C(Al) was deposited via co-sputtering of graphite, Ti , and Al targets. Although the nanocomposite coating exhibited a moderately high hardness (about 20 GPa), it possessed extremely high toughness (about 55% of plasticity during indentation deformation) and low residual stress (less than 0.4 GPa), smooth (Ra=5.5 nm ), and hydrophobic surface (contact angle with water reaches 100°).

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