Hochimin Thilagar - Academia.edu (original) (raw)
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Papers by Hochimin Thilagar
This work presents evaluation of macro sized metal based microgrippers of various shapes such as ... more This work presents evaluation of macro sized metal based microgrippers of various shapes such as circular, square and rectangular, which can hold circular, square and rectangular microcomponents respectively. The developed microgrippers can be used effectively as a holding device in mechanical environments and also in the assembly of microcomponents. Microgrippers are designed and analyzed using SOLIDWORKS and COMSOL Multiphysics respectively. Fabrication of microgrippers are carried out using direct metal laser sintering process with six gripping arms to prevent the slipping of the microcomponents during handling. The microgrippers were actuated by means of specially designed actuation system. The fabricated microgrippers are characterized for gripping displacements and gripping forces and the results are compared with that of the simulation and analytical results. It is observed that the displacements of the gripping arms of the fabricated microgrippers are four times higher than ...
This paper considers the use of surface stress based sensors as bio chemical sensors. In principl... more This paper considers the use of surface stress based sensors as bio chemical sensors. In principle, adsorption of bio chemical species on a functionalized surface of a microfabricated cantilever will cause surface stress and consequently the cantilever bends. Piezoresistive actuation of a micro cantilever induced by bio molecular binding such as DNA hybridization and antibody-antigen binding is an important principle. This paper presents design and simulation studies of gold coated Piezoresistive cantilever used as Micro Electro Mechanical System (MEMS) based biosensor for the detection of Low Density Lipoproteins (LDL). This paper uses Finite Element Method (FEM) to obtain the performance of piezoresistive microcantilever sensor by optimizing the geometrical dimensions of both cantilever and piezoresistor. A 200µm X 100µm X 1µm Silicon cantilever integrated with 0.3 µm thick Silicon piezoresistor, with 1µm of gold coating was used. The sensor performance was measured on the basis of displacement sensitivity and surface stress sensitivity. The sensor sensitivity was investigated by varying cantilever thickness as well as piezoresistor thickness and its width. Simulation results show that the cantilever sensitivity is good when cantilever, piezoresistor thickness and piezoresistor width are at minimum.
This work presents evaluation of macro sized metal based microgrippers of various shapes such as ... more This work presents evaluation of macro sized metal based microgrippers of various shapes such as circular, square and rectangular, which can hold circular, square and rectangular microcomponents respectively. The developed microgrippers can be used effectively as a holding device in mechanical environments and also in the assembly of microcomponents. Microgrippers are designed and analyzed using SOLIDWORKS and COMSOL Multiphysics respectively. Fabrication of microgrippers are carried out using direct metal laser sintering process with six gripping arms to prevent the slipping of the microcomponents during handling. The microgrippers were actuated by means of specially designed actuation system. The fabricated microgrippers are characterized for gripping displacements and gripping forces and the results are compared with that of the simulation and analytical results. It is observed that the displacements of the gripping arms of the fabricated microgrippers are four times higher than ...
This paper considers the use of surface stress based sensors as bio chemical sensors. In principl... more This paper considers the use of surface stress based sensors as bio chemical sensors. In principle, adsorption of bio chemical species on a functionalized surface of a microfabricated cantilever will cause surface stress and consequently the cantilever bends. Piezoresistive actuation of a micro cantilever induced by bio molecular binding such as DNA hybridization and antibody-antigen binding is an important principle. This paper presents design and simulation studies of gold coated Piezoresistive cantilever used as Micro Electro Mechanical System (MEMS) based biosensor for the detection of Low Density Lipoproteins (LDL). This paper uses Finite Element Method (FEM) to obtain the performance of piezoresistive microcantilever sensor by optimizing the geometrical dimensions of both cantilever and piezoresistor. A 200µm X 100µm X 1µm Silicon cantilever integrated with 0.3 µm thick Silicon piezoresistor, with 1µm of gold coating was used. The sensor performance was measured on the basis of displacement sensitivity and surface stress sensitivity. The sensor sensitivity was investigated by varying cantilever thickness as well as piezoresistor thickness and its width. Simulation results show that the cantilever sensitivity is good when cantilever, piezoresistor thickness and piezoresistor width are at minimum.