96 research outputs found
Surface effects on the electro-mechanical properties of silicon nano-ribbons and nano-wires
No full textThe need for developing simple and generic characterization tools to deform
freestanding silicon beams down to the nanometre scale, sufficiently equipped to
investigate both the mechanical properties and the carrier transport under large strains,
has been met in this research through the design of a versatile lab-on-chip. The Young’s
modulus was observed to unexpectedly decrease from a bulk value of 169 GPa down to
96 GPa when varying the thickness of silicon from 200 down to 30 nm. The fracture
strain increases when decreasing the volume of the test specimen starting from 0.2 % for
a bulk silicon wafer, to reach 5% in the smallest SiNWs.
In order to proceed with characterizing its electro-mechanical properties, it is necessary
to understand the influence of surface state charge distributions on SiNW transport
characteristics. The removal of the oxide at the surface of SiNWs by a HF treatment
results in a drop in conductance up to six orders of magnitude. This effect is from a
surface depletion of holes in the SiNW induced by positive surface charges deposited
from the HF treatment. However, it is observed that this charge density is transient and is
dissipated with the re-growth of an oxide layer. Additionally, atomic layer deposited Al203
can be used to control the surface potential of p-type SiNWs from depletion to
accumulation. In summary, the SiNW conductance can be reproducibly controlled up to
several orders of magnitude, while playing with four common surface conditions: with a
native oxide, deposited Al203, thermal oxide and HF induced H-terminations.
Finally, the piezo-resistance of SiNWs has been investigated under large uniaxial tension
up to fracture using an original on-chip tensile testing technique. The piezo-resistance
coefficient (π) was found to increase by a factor of 6, when decreasing the dopant
concentration from Na ~ 1 x 1019 cm-3 down to ~ Na ~ 5 x 1017 cm-3. Reduction of
resistance up to a factor of 5.8, higher than theoretical prediction of 4.5 is reported for Na
~ 5 x 1017 cm-3 under a stress of 1.7 GPa, without any sign of saturation.(FSA 3) -- UCL, 201
Affinity Based Reverse Micellar Extraction and Separation (ARMES)of Bromelain from Pineapple (Ananas comosus)
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Field Assisted Drying for Improving Food Quality
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Hybrid Technology for Food Dehydration
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Application of process induced stress to study the mechanical properties of monocrystalline and amorphous silicon thin films (poster pres. by U. Bhaskar)
No full textA critical assessment of technical advances in pharmaceutical removal from wastewater – A critical review
No full textUse of pharmaceutical products has seen a tremendous increase in the recent decades. It has been observed that more than thirty million tons of pharmaceuticals are consumed worldwide. The used pharmaceutical products are not completely metabolized in human and animal body. Therefore, they are excreted to the environment and remain there as persistent organic chemicals. These compounds emerge as toxic contaminants in water and affect the human metabolism directly or indirectly. This literature review is an endeavour to understand the origin, applications and current advancement in the removal of pharmaceuticals from the environment. It discusses about the pharmaceuticals used in medical applications such diagnosis and disease treatment. In addition, it discusses about the recent approaches applied in pharmaceutical removal including microbial fuel cells, biofiltration, and bio nanotechnology approaches. Moreover, the challenges associated with pharmaceutical removal are presented considering biological and environmental factors. The review suggest the potential recommendations on pharmaceutical removal.The corresponding author Prof. Vinay Kumar is thankful to all the co-authors for their collaborative efforts in writing this paper. This work was supported by Department of Community Medicine, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, India.Peer reviewe
Biotransformation Of Tea Polyphenols To Value Added Products
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Ferromagnetism in half-metallic EuGaO3 perovskite: A combined DFT and DFT+U investigation
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