RD
R.J. Dolleman
info
Please Note
<p>This page displays the records of the person named above and is not linked to a unique person identifier. This record may need to be merged to a profile.</p>
2 records found
1
Master thesis
(2018)
-
Irek Rosłoń, Robin Joey Dolleman, Peter Steeneken, Farbod Alijani, Herre van der Zant
Gas permeation through graphene membranes has received considerable attention for water purification and molecular sieving applications. However, characterization of the permeation has been limited to long timescales of minutes. This thesis shows a method for measuring gas permeation through porous graphene membranes at the microsecond timescale. Suspended porous graphene membranes, with an average pore size of 14 nm and a single 400 nm pore, are brought into sinusoidal motion by optothermal actuation. By monitoring the frequency dependent phase delay between actuation signal and mechanical motion, the gas dependent permeation time of the porous membrane is determined. The permeation time constant is demonstrated to be proportional to the square root of the molecular mass, indicating an effusion dominated permeation mechanism. The determination of permeation at timescales below 1 ms using a femtoliter gas cavity opens up opportunities for novel nanoscale porous graphene based gas sensors, with very fast response times.
...
Gas permeation through graphene membranes has received considerable attention for water purification and molecular sieving applications. However, characterization of the permeation has been limited to long timescales of minutes. This thesis shows a method for measuring gas permeation through porous graphene membranes at the microsecond timescale. Suspended porous graphene membranes, with an average pore size of 14 nm and a single 400 nm pore, are brought into sinusoidal motion by optothermal actuation. By monitoring the frequency dependent phase delay between actuation signal and mechanical motion, the gas dependent permeation time of the porous membrane is determined. The permeation time constant is demonstrated to be proportional to the square root of the molecular mass, indicating an effusion dominated permeation mechanism. The determination of permeation at timescales below 1 ms using a femtoliter gas cavity opens up opportunities for novel nanoscale porous graphene based gas sensors, with very fast response times.
Ever since its inception, graphene has been the subject of research in many parts of the
world. This is due to its exceptional mechanical and electrical properties, which makes it
ideal for NanoElectroMechanical (NEMS) devices. The inherent nature of NEMS devices,
includes low damping, large amplitudes of oscillation, resonant operating conditions, and
the presence of nonlinear force fields. This sets an ideal stage for the appearance of nonlinear
behavior. In this thesis, appearance of such nonlinear behavior in optothermally actuated
graphene nanodrum resonators is studied. Frequency response arising from parametric
excitation is explained based on, time modulated stiffness due to temperature variation in
the membrane. Also, the response arising from direct excitation is discussed based on initial
geometric imperfection present in the membrane. In order to explain the nonlinear response
seen in graphene resonators, novel analytical models are developed and its corresponding
limitations are discussed. A single differential equation is used to simulate the behavior
of both directly and parametrically excited graphene nanoresonator. This equation is
used to study the influence of nonlinear damping on response of the system. Then, an
illustration is provided on characterization of graphene properties from the parametric
response of the system. Finally, it is concluded that, alternative damping mechanism and
other physical phenomena could be influencing the system dynamics. Therefore, modeling
of these phenomena would lead to better matching of the experimental results. ...
world. This is due to its exceptional mechanical and electrical properties, which makes it
ideal for NanoElectroMechanical (NEMS) devices. The inherent nature of NEMS devices,
includes low damping, large amplitudes of oscillation, resonant operating conditions, and
the presence of nonlinear force fields. This sets an ideal stage for the appearance of nonlinear
behavior. In this thesis, appearance of such nonlinear behavior in optothermally actuated
graphene nanodrum resonators is studied. Frequency response arising from parametric
excitation is explained based on, time modulated stiffness due to temperature variation in
the membrane. Also, the response arising from direct excitation is discussed based on initial
geometric imperfection present in the membrane. In order to explain the nonlinear response
seen in graphene resonators, novel analytical models are developed and its corresponding
limitations are discussed. A single differential equation is used to simulate the behavior
of both directly and parametrically excited graphene nanoresonator. This equation is
used to study the influence of nonlinear damping on response of the system. Then, an
illustration is provided on characterization of graphene properties from the parametric
response of the system. Finally, it is concluded that, alternative damping mechanism and
other physical phenomena could be influencing the system dynamics. Therefore, modeling
of these phenomena would lead to better matching of the experimental results. ...
Ever since its inception, graphene has been the subject of research in many parts of the
world. This is due to its exceptional mechanical and electrical properties, which makes it
ideal for NanoElectroMechanical (NEMS) devices. The inherent nature of NEMS devices,
includes low damping, large amplitudes of oscillation, resonant operating conditions, and
the presence of nonlinear force fields. This sets an ideal stage for the appearance of nonlinear
behavior. In this thesis, appearance of such nonlinear behavior in optothermally actuated
graphene nanodrum resonators is studied. Frequency response arising from parametric
excitation is explained based on, time modulated stiffness due to temperature variation in
the membrane. Also, the response arising from direct excitation is discussed based on initial
geometric imperfection present in the membrane. In order to explain the nonlinear response
seen in graphene resonators, novel analytical models are developed and its corresponding
limitations are discussed. A single differential equation is used to simulate the behavior
of both directly and parametrically excited graphene nanoresonator. This equation is
used to study the influence of nonlinear damping on response of the system. Then, an
illustration is provided on characterization of graphene properties from the parametric
response of the system. Finally, it is concluded that, alternative damping mechanism and
other physical phenomena could be influencing the system dynamics. Therefore, modeling
of these phenomena would lead to better matching of the experimental results.
world. This is due to its exceptional mechanical and electrical properties, which makes it
ideal for NanoElectroMechanical (NEMS) devices. The inherent nature of NEMS devices,
includes low damping, large amplitudes of oscillation, resonant operating conditions, and
the presence of nonlinear force fields. This sets an ideal stage for the appearance of nonlinear
behavior. In this thesis, appearance of such nonlinear behavior in optothermally actuated
graphene nanodrum resonators is studied. Frequency response arising from parametric
excitation is explained based on, time modulated stiffness due to temperature variation in
the membrane. Also, the response arising from direct excitation is discussed based on initial
geometric imperfection present in the membrane. In order to explain the nonlinear response
seen in graphene resonators, novel analytical models are developed and its corresponding
limitations are discussed. A single differential equation is used to simulate the behavior
of both directly and parametrically excited graphene nanoresonator. This equation is
used to study the influence of nonlinear damping on response of the system. Then, an
illustration is provided on characterization of graphene properties from the parametric
response of the system. Finally, it is concluded that, alternative damping mechanism and
other physical phenomena could be influencing the system dynamics. Therefore, modeling
of these phenomena would lead to better matching of the experimental results.