Nano-scale effects of selective spin-on deposition

2021 ◽  
Author(s):  
Ryan L. Burns ◽  
Yuanyi Zhang ◽  
Colton D'Ambra ◽  
Mark H. Somervell ◽  
Sean Berglund ◽  
...  
Keyword(s):  
Scale Effects ◽  
Nano Scale

Effects of Elastic Restraints on the Fundamental Frequency of Nonlocal Nanobeams with Tip Mass

2019 ◽  
Vol 24 (3) ◽  
pp. 520-530
Author(s):  
Malesela K. Moutlana ◽  
Sarp Adali
Keyword(s):  
Fundamental Frequency ◽  
Scale Effects ◽  
Beam Theory ◽  
Nonlocal Theory ◽  
Small Scale ◽  
Nano Scale ◽  
Scale Structures ◽  
Elastically Restrained ◽  
Elastic Restraints ◽  
Tip Mass

The fundamental frequencies of an elastically restrained nanobeam with a tip mass are studied based on the nonlocal Euler-Bernoulli beam theory. The nanobeam has a torsional spring at one end and a translational spring at the other end where a tip mass is attached. The aim is to model a tapping mode atomic force microscope (TM-AFM), which can be utilized in imaging and the manufacture of Nano-scale structures. A TM-AFM uses high frequency oscillations to remove material, shape structures or scan the topology of a Nano-scale structure. The nonlocal theory is effective at modelling Nano-scale structures, as it takes small scale effects into account. Torsional elastic restraints can model clamped and pinned boundary conditions, as their stiffness values change between zero and infinity. The effects of the stiffness of the elastic restraints, tip mass and the small-scale parameter on the fundamental frequency are investigated numerically.

scholarly journals A Revised Model for Magneto Convection in Binary Nanofluids

2019 ◽  
Vol 4 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Jyoti Sharma ◽  
Urvashi Gupta ◽  
Shushant Shukla
Keyword(s):  
Magnetic Field ◽  
Brownian Motion ◽  
Normal Mode ◽  
Scale Effects ◽  
Onset Of Convection ◽  
Nano Scale ◽  
Brownian Motion And Thermophoresis ◽  
Mode Technique ◽  
Double Diffusive

The paper presents double-diffusive nanofluid convection under magnetic field using more realistic revised model in which boundaries are assumed to have zero nanoparticle flux. The nanofluid layer includes the nano scale effects (Brownian motion and thermophoresis) and solutal effects (Dufour and Soret). Impact of different parameters is analyzed using normal mode technique and interpreted graphically with the help of the software Mathematica. Complex expressions for oscillatory motions are solved using approximations to confirm their non-existence and onset of convection is established as stationary. Binary nanofluids are found to be much less stable than regular fluids. Higher conductivity of metallic nanofluids makes them less stable as compared to non-metallic nanofluids.

Finite bending of a multilayered cylindrical nanosector with residual deformations

2017 ◽  
Vol 23 (5) ◽  
pp. 715-726 ◽  
Author(s):  
Taisiya Sigaeva ◽  
Aleksander Czekanski
Keyword(s):  
Plane Strain ◽  
Scale Effects ◽  
Cylindrical Tube ◽  
Nonlinear Effects ◽  
Universal Model ◽  
Multiplicative Decomposition ◽  
Nano Scale ◽  
Residual Deformations ◽  
Finite Bending ◽  
Deformation Gradients

This paper deals with the universal model describing plane strain bending of a multilayered sector of a cylindrical tube which can have residual deformations as well as nano-scale effects. In order to model the response of the sector at the nano-scale, the Gurtin–Murdoch theory is employed. Residual deformations of the layers, such as prestretch or precompression, are introduced into the model of finite bending using the multiplicative decomposition rule for corresponding deformation gradients. Numerous coupled nonlinear effects exhibited by the sector are discussed.

Heat Transfer Enhancement in Nanofluid Suspensions

2004 ◽  
Author(s):  
Peter Vadasz ◽  
Johnathan J. Vadasz ◽  
Saneshan Govender
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Scale Effects ◽  
Nano Scale ◽  
Sufficient Detail ◽  
Macro Scale ◽  
Wave Effects ◽  
Conduction Theory ◽  
Wave Phenomena ◽  
Liquid Layering

The investigation into possible applications of the thermal wave conduction theory to explain the spectacular enhancement of heat flux by a factor of between 1.4 to 2.5 in nanofluid suspensions is presented. While other possible explanations have been proposed to settle this discrepancy they were not investigated into sufficient detail for providing a definite answer and they all apply at the nano-scale level rather than bridging between the nano-scale effects and the macro-system investigated. The possible mechanisms proposed so far are Brownian motion, liquid layering at the liquid/particle interface, ballistic phonon effects, nanoparticle clustering as well as convection and wave effects. Furthermore, most available methods for measuring thermal conductivity assume and make use explicitly of the Fourier mechanism of heat transfer. If somehow the nano-level heat transfer effects impact profoundly on the resulting heat flux at the macro-level, possibly via wave phenomena, the whole concept behind the measurement device might be flawed. The present paper presents a possible way by which the transitions from nano-scale via the micro-scales towards the macro-scale occur, hence bridging the gap from nano devices to macro systems performance.

Nano-Scale Effects in the Sliding and Rolling of a Cylinder on a Substrate

2005 ◽  
Vol 72 (5) ◽  
pp. 633-640 ◽  
Author(s):  
O¨. T. Sari ◽  
G. G. Adams ◽  
S. Mu¨ftu¨
Keyword(s):  
Contact Problem ◽  
Scale Effects ◽  
Cylindrical Body ◽  
Friction Stress ◽  
Two Dimensional ◽  
Nano Scale ◽  
Sliding Motion ◽  
Tangential Forces ◽  
Applied Forces ◽  
The Subject

The behavior of a nano-scale cylindrical body (e.g., a fiber), lying on a substrate and acted upon by a combination of normal and tangential forces, is the subject of this investigation. As the scale decreases to the nano level, adhesion becomes an important issue in this contact problem. Thus, this investigation treats the two-dimensional plane strain elastic deformation of both the cylinder and the substrate during a rolling/sliding motion, including the effect of adhesion using the Maugis model. For the initiation of sliding, the Mindlin approach is used, whereas for rolling, the Carter approach is utilized. Each case is modified for nano-scale effects by including the effect of adhesion on the contact area and by using the adhesion theory of friction for the friction stress. Analytical results are given for the normal and tangential loading problems, including the initiation of sliding and rolling in terms of dimensionless quantities representing adhesion, cylinder size, and applied forces.

MODELING GATE CURRENT FOR NANO SCALE MOSFET WITH DIFFERENT GATE SPACER

2011 ◽  
Vol 20 (08) ◽  
pp. 1659-1675 ◽  
Author(s):  
ASHWANI K. RANA ◽  
NAROTTAM CHAND ◽  
VINOD KAPOOR
Keyword(s):  
Leakage Current ◽  
Scale Effects ◽  
Current Model ◽  
Tunneling Current ◽  
Oxide Semiconductor ◽  
Experimental Result ◽  
Gate Leakage ◽  
Gate Current ◽  
Nano Scale ◽  
Gate Tunneling

Dimensions of metal–oxide–semiconductor field effect transistor (MOSFET) have been scaled down for decades to maintain the performance. So, as a result of aggressive scaling, gate oxide thickness approaches its manufacturing and physically limiting value of less than 2 nm in nano regime. Under such circumstances, gate leakage (tunneling) current has become a critical problem in nano domain as compared to subthreshold leakage current. Consequently, accurate quantitative understanding of gate tunneling leakage current is very important especially in context of low power VLSI application. In this work, gate tunneling currents have been modeled including the inevitable nano scale effects for a MOSFET having different high-k dielectric spacer such as SiO2 , Si3N4 , Al2O3 , HfO2 . The gate current model is compared and contrasted with santaurus simulation results and reported experimental result to verify the accuracy of the model. The agreement found was good, thus validating the developed analytical model. It is observed that neglecting nano scale effects may lead to large error in the calculated gate current. It is found in the results that gate leakage current decreases with the increase of dielectric constant of the gate spacer. Further, it is also reported that the spacer materials impact the threshold voltage, on current, off current, drain induced barrier lowering, and subthreshold slope of the device.

scholarly journals Nano-scale effects on Young's modulus of nanoimprint polymers measured by photoacoustic metrology

2010 ◽  
Vol 214 ◽  
pp. 012049 ◽  
Author(s):  
T Kehoe ◽  
J Bryner ◽  
V Reboud ◽  
J Dual ◽  
C M Sotomayor Torres
Keyword(s):  
Young’S Modulus ◽  
Scale Effects ◽  
Young's Modulus ◽  
Nano Scale

The Sliding and Rolling of a Cylinder at the Nano-Scale

2004 ◽  
Author(s):  
O. Taylan Sari ◽  
George G. Adams ◽  
Sinan Mu¨ftu¨
Keyword(s):  
Contact Problem ◽  
Scale Effects ◽  
Cylindrical Body ◽  
Friction Stress ◽  
Two Dimensional ◽  
Nano Scale ◽  
Sliding Motion ◽  
Tangential Forces ◽  
Applied Forces ◽  
The Subject

The behavior of a nano-scale cylindrical body (e.g. a fiber), lying on a substrate and acted upon by a combination of normal and tangential forces, is the subject of this investigation. As the scale decreases to the nano level, adhesion becomes an important issue in this contact problem. Thus this investigation treats the two-dimensional plane strain elastic deformation of both the cylinder and the substrate during a rolling/sliding motion, including the effect of adhesion using the Maugis model. For the initiation of sliding, the Mindlin approach is used, whereas for rolling, the Carter approach is utilized. Each case is modified for nano-scale effects by including the effect of adhesion on the contact area and by using the adhesion theory of friction for the friction stress. Analytical results are given for the normal and tangential loading problems, including the initiation of sliding and rolling in terms of dimensionless quantities representing adhesion, cylinder size, and applied forces.

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