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Piezoelectric excitation and acoustic detection of thin film polymer membrane vibrations (2024)
Journal Article
Roberts, N. M., & Sharp, J. S. (2024). Piezoelectric excitation and acoustic detection of thin film polymer membrane vibrations. Physical Review E, 109(1), Article 014802. https://doi.org/10.1103/physreve.109.014802

A simple method of measuring the vibrational response of a thin film membrane was developed. Piezoelectric excitation and acoustic detection (using a microphone) allowed the vibrational spectra of thin membranes to be measured in the kHz range. Vibra... Read More about Piezoelectric excitation and acoustic detection of thin film polymer membrane vibrations.

Thickness dependence of telephone cord blister formation in solvent swollen films of polydimethylsiloxane (2023)
Journal Article
Sharp, J. S., & Roberts, N. M. (2023). Thickness dependence of telephone cord blister formation in solvent swollen films of polydimethylsiloxane. Soft Matter, 19(40), 7796-7803. https://doi.org/10.1039/d3sm01051a

The thickness dependence of telephone cord blister formation in thin films of solvent swollen polydimethylsiloxane (PDMS) was studied using a simple imaging setup. Chloroform was deposited on top of PDMS that had been spin coated on to glass slides c... Read More about Thickness dependence of telephone cord blister formation in solvent swollen films of polydimethylsiloxane.

Imaging mass spectrometry of fingermarks on brass bullet casings using sample rotation (2021)
Journal Article
Lee, C. J., Scurr, D. J., Jiang, L., Kenton, A., Beebe, S. R. T., & Sharp, J. S. (2021). Imaging mass spectrometry of fingermarks on brass bullet casings using sample rotation. Analyst, 146(24), 7563-7572. https://doi.org/10.1039/d1an01768c

A rotation stage was developed to allow the surface of bullet casings to be imaged under ultra-high vacuum (UHV) conditions using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Experiments were performed over a period of seven months to d... Read More about Imaging mass spectrometry of fingermarks on brass bullet casings using sample rotation.

The emergence of local wrinkling or global buckling in thin freestanding bilayer films (2020)
Journal Article
Niven, J. F., Chowdhry, G., Sharp, J. S., & Dalnoki-Veress, K. (2020). The emergence of local wrinkling or global buckling in thin freestanding bilayer films. European Physical Journal E, 43(4), https://doi.org/10.1140/epje/i2020-11946-y

Periodic wrinkling of a rigid capping layer on a deformable substrate provides a useful method for templating surface topography for a variety of novel applications. Many experiments have studied wrinkle formation during the compression of a rigid fi... Read More about The emergence of local wrinkling or global buckling in thin freestanding bilayer films.

Dual optical force plate for time resolved measurement of forces and pressure distributions beneath shoes and feet (2019)
Journal Article
Tompkins, C. G., & Sharp, J. S. (2019). Dual optical force plate for time resolved measurement of forces and pressure distributions beneath shoes and feet. Scientific Reports, 9, Article 8886. https://doi.org/10.1038/s41598-019-45287-9

Frustrated total internal reflection (FTIR) imaging was used to perform remote optical measurements of the forces/pressures exerted beneath shoes and feet during a number of different training activities including countermovement jumps, jogging and d... Read More about Dual optical force plate for time resolved measurement of forces and pressure distributions beneath shoes and feet.

Optical measurement of contact forces using frustrated total internal reflection (2018)
Journal Article
Sharp, J. S., Poole, S. F., & Kleiman, B. W. (2018). Optical measurement of contact forces using frustrated total internal reflection. Physical Review Applied, 10(3), Article 034051. https://doi.org/10.1103/physrevapplied.10.034051

A simple device based on the principle of frustrated total internal reflection is used to image the regions of contact between rubber objects and a large-area perspex waveguide. Measurements of the intensity of light scattered at the interface are fo... Read More about Optical measurement of contact forces using frustrated total internal reflection.

Exposing latent fingermarks on problematic metal surfaces using time of flight secondary ion mass spectroscopy (2018)
Journal Article
Thandauthapani, T. D., Reeve, A. J., Long, A. S., Turner, I. J., & Sharp, J. S. (2018). Exposing latent fingermarks on problematic metal surfaces using time of flight secondary ion mass spectroscopy. Science and Justice, 58(6), 405-414. https://doi.org/10.1016/j.scijus.2018.08.004

Fingermarks are a key form of physical evidence for identifying persons of interest and linking them to the scene of a crime. Visualising latent (hidden) fingermarks can be difficult and the correct choice of techniques is essential to develop and pr... Read More about Exposing latent fingermarks on problematic metal surfaces using time of flight secondary ion mass spectroscopy.

Accessible biometrics: a frustrated total internal reflection approach to imaging fingerprints (2017)
Journal Article
Smith, N. D., & Sharp, J. S. (2017). Accessible biometrics: a frustrated total internal reflection approach to imaging fingerprints. Science and Justice, 57(3), https://doi.org/10.1016/j.scijus.2017.03.003

Fingerprints are widely used as a means of identifying persons of interest because of the highly individual nature of the spatial distribution and types of features (or minuta) found on the surface of a finger. This individuality has led to their wid... Read More about Accessible biometrics: a frustrated total internal reflection approach to imaging fingerprints.

Optovibrometry: tracking changes in the surface tension and viscosity of multicomponent droplets in real-time (2016)
Journal Article
Harrold, V. C., & Sharp, J. S. (2016). Optovibrometry: tracking changes in the surface tension and viscosity of multicomponent droplets in real-time. Soft Matter, 12(42), https://doi.org/10.1039/C6SM01901C

An instrument was developed for measuring real time changes in the surface tension and viscosity of multicomponent droplets of miscible liquids and other soft materials. Droplets containing glycerol and water were supported on superamphiphobic surfa... Read More about Optovibrometry: tracking changes in the surface tension and viscosity of multicomponent droplets in real-time.

The interplay of crack hopping, delamination and interface failure in drying nanoparticle films (2016)
Journal Article
Yang, B., Sharp, J. S., & Smith, M. I. (2016). The interplay of crack hopping, delamination and interface failure in drying nanoparticle films. Scientific Reports, 6(1), 1-9. https://doi.org/10.1038/srep32296

Films formed through the drying of nanoparticle suspensions release the build-up of strain through a variety of different mechanisms including shear banding, crack formation and delamination. Here we show that important connections exist between thes... Read More about The interplay of crack hopping, delamination and interface failure in drying nanoparticle films.