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Browsing by Author "Wilson, Stephen A."

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Characterisation of PZT thin film micro-actuators using a silicon micro-force sensor

Duval, Fabrice F. C.; Wilson, Stephen A.; Ensell, Graham; Evanno, Nicolas M. P.; Cain, Markys G.; Whatmore, Roger W. (Elsevier, 2007-01-08)

This paper reports on the measurements of displacement and blocking force of piezoelectric micro-cantilevers. The free displacement was studied using a surface profiler and a laser vibrometer. The experimental data were ...
Chemical synthesis of nanoparticles and electrohydrodynamic manipulation of nanoparticulate suspensions

Libor, Zsuzsanna (Cranfield University, 2009-09)

This research concerns the study of nanoparticle synthesis methods and the influence that nanoparticles can have on the physical and electrical properties of non-polar fluids. In this study it is demonstrated that a very ...
Electric-field structuring of piezoelectric composite materials

Wilson, Stephen A. (Cranfield University, 1999-09)

Piezoelectric composite materials, consisting of a ferroelectric ceramic in an electrically-inactive polymer matrix, have been shown to greatly outperform single phase materials for certain applications. A new assembly ...
Electrostatic manipulation of piezoelectric fibres using a sharp probe electrode in a dielectric liquid: Analysis of the electrohydrodynamic phenomena

Capria, Ennio (Cranfield University, 2007-05)

Micro-assembly techniques have been identified as a major technology ‘pillar’ that will underpin further advancements in integrated micro-and nano-systems. In practice, there is a generic requirement for component parts ...
Enhanced DC conductivity of low volume-fraction nano-particulate suspensions in silicone and perfluorinated oils.

Wilson, Stephen A.; Libor, Zsuzsanna; Skordos, Alexandros A.; Zhang, Qi (Iop Publishing Ltd, 2009-03-01)

The contrasting DC conductivities of several different types of nanoparticles (nickel, barium titanate and magnetite) suspended in both silicone and perfluorinated oils have been measured and compared. Enhanced DC ...
Flextensional ultrasonic motor using the contour mode of a square piezoelectric plate.

Leinvuo, Joni T.; Wilson, Stephen A.; Whatmore, Roger W. (IEEE Institute of Electrical and Electronics, 2004-08-01)

This paper presents the design, fabrication, and characterization of a new type of standing wave piezoelectric ultrasonic motor. The motor uses a metallic flextensional amplifier, or cymbal, to convert the contour mode ...
Flextensional ultrasonic piezoelectric micro-motor.

Leinvuo, Joni T.; Wilson, Stephen A.; Whatmore, Roger W.; Cain, Markys G. (IEEE Institute of Electrical and Electronics, 2006-12-01)

This paper presents the experimental design, construction, and operational characteristics of a new type of standing wave piezoelectric ultrasonic micro-motor. The motor uses a composite stator, consisting of a metallic ...
The impact of structural changes on the actuation of polypyrroles

Melling, Daniel (Cranfield University, 2012-08)

A new non-contact method for characterizing the time-dependent mechanical performance of electro-active polymer films has been developed and is described in detail. We first illustrate our new measuring technique by ...
A new flextensional piezoelectric ultrasonic motor - design, fabrication and characterisation

Leinvuo, Joni T.; Wilson, Stephen A.; Whatmore, Roger W.; Cain, Markys G. (Elsevier, 2007-01-08)

This paper presents the techniques used for the characterisation of a new type of standing-wave piezoelectric ultrasonic motor. The motor uses a metallic flextensional amplifier, or “cymbal”, to convert the radial mode ...
Rheological properties of magnetic and electro-active nanoparticles in non-polar liquids

Libor, Zsuzsanna; Wilson, Stephen A.; Zhang, Qi (Springer Science Business Media, 2011-08-31)

The rheological properties of two non-polar liquids [silicone oil or perfluorinated oil (FC70)] containing various types of particles, barium titanate, nickel and iron oxide, were investigated as functions of solid loading, ...
Structure modification of 0–3 piezoelectric ceramic/polymer composites through dielectrophoresis

Wilson, Stephen A.; Maistros, George M.; Whatmore, Roger W. (Institute of Physics, 2005-01-21)

Anisotropic material properties can be induced in ceramic/polymer composites by applying an alternating electric field of moderate strength during processing. Under suitable conditions, particles of a ceramic filler material ...
Thick-film piezoelectric bimorph actuators for MEMS devices

Owens, Sam (Cranfield University, 2011-08)

Active ow control can be used to improve the aerodynamic e ciency of passenger aircraft, road tra c and wind turbines amongst other applications. This work describes the fabrication of an ultra-compact microvalve that ...
Ultra-precision grinding of piezoelectric ceramic thick films for fabrication of pre-stressed bimorph microactuators and development of new numerical models to assess induced thermal stress in multilayer structure

Jourdain, R. P. (Cranfield University, 2005-09)

The research programme aims to develop a novel 2.5 dimensional fabrication process for multilayer piezoelectric microactuators. Ultra-precision grinding was used in conjunction with standard micro-fabrication techniques ...
Ultra-precision grinding of PZT ceramics--Surface integrity control and tooling design

Arai, S.; Wilson, Stephen A.; Corbett, John; Whatmore, Roger W. (Elsevier, 2009-10)

A comprehensive statistical analysis of the factors controlling surface quality and form in ultra-precision grinding of polycrystalline lead zirconate titanate (PZT) ceramics has been conducted. The work focuses on practical ...

Browsing by Author "Wilson, Stephen A."

Browsing by Author "Wilson, Stephen A."

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