Flexible Shear Stress Sensor

Micro- and Nanoscale Anemometry Implication for Biomedical Applications, Fig. 7 (a) Cross section of a flexible shear stress sensor, (b) Shear stress sensors are... 

Xu Y, Jiang F, Newbem S, Huang A, Ho C-M, Tai Y-C (2003) Flexible shear-stress sensor skin and its application to unmanned aerial vehicle. Sens Actuators A 105 321-329... 

Flexible shear-stress sensor skin and its application to unmanned aerial vehicles. Sens Actuators A 105 321-329... 

The design and development of aerod)mamic vehicles require precise measurements of shear stress and boundary layer for turbulence control. The application of MEMS sensors has enabled the locahzation of flow separation where drastic variation in shear stress develops on the air foils. Ho and Tai [11] have demonstrated the utilization of the MEMS shear stress sensors for an aerodynamic aircraft by fabricating an IC-integrated skin, which is flexible and conformal to the surface of air foils [15]. For instance, a network of sensors has been implemented in different structural sections of a delta-wing (Fig. 9a) via flexible shear stress sensors (Fig. 9b) in an unmanned... 

Flexible Polymer Packaging for Shear Stress Sensors... 

The emerging role of micro- and nanoscale hot-wire anemometry would likely accelerate the translation of in vitro devices to in vivo applications, thereby bridging the lab-to-patient gap. Real-time measurements of intravascular physical parameters, specifically shear stress, temperature, pressure, and flow rate, provide a basis to link hemodynamics with biochemical events in blood vessels. The complex curvature of the vascular system requires small, minimally invasive sensors to discretely measure in real time intravascular physical parameters with minimal blood flow disturbance. To achieve this, flexible micro-and nanoscale sensors would allow for steering in the complicated anatomy in biological systems (Fig. 11). In summary, the utilization of micro- or nanoscale sensors provides a quantitative assessment of vascular hemodynamics. This approach lends itself to applications in broad areas of medicine and physiology and is particularly relevant to quantitative studies of cancer biology as well as... 

Fillers of various dimensions are added to polymers to alter its processability, properties and uses. Such micro and nano composites obtained may have tremendous possibilities in industries and information on their viscoelasticity is very necessary as far as their processing and applicability are concerned. The dynamic properties of filled elastomers have been a subject of active research since they affect the performance of tyres such as skid, traction, and rolling resistance. Elastomer nanocomposites are most important materials characterized by excellent elasticity and flexibility, and are widely used in various applications such as cables, tyres, tubing, dielectric materials and sensors [1-5]. The non linear features observed in filled elastomers upon a simple shear are as follows. The dynamic storage and loss moduli of the composites are only dependent on the dynamic strains and not on the static strain. In the same way the stress strain curves also do not depend on static strain. Moreover the initial modulus under constant strain rate is highly rate dependent whereas the terminal modulus is independent of strain rate. This initial to terminal modulus ratio in the stress-strain curves is the same as the ratio of the dynamic storage moduli obtained at low and high strains. 

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