All Outputs (17)

Piezoelectric excitation and acoustic detection of thin film polymer membrane vibrations (2024)
Journal Article

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

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

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.

Combined total internal reflection AF spectral-imaging and Raman spectroscopy for fast assessment of surgical margins during breast cancer surgery (2021)
Journal Article

The standard treatment for breast cancer is surgical removal mainly through breast conserving surgey (BCS). We developed a new technique based on auto-fluorescence (AF) spectral imaging and Raman spectroscopy for fast intraoperative assessment of exc... Read More about Combined total internal reflection AF spectral-imaging and Raman spectroscopy for fast assessment of surgical margins during breast cancer surgery.

The emergence of local wrinkling or global buckling in thin freestanding bilayer films (2020)
Journal Article

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

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

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

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

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.

Rheological properties of viscoelastic drops on superamphiphobic substrates (2016)
Journal Article
Harrold, V. C., Paven, M., Vollmer, D., & Sharp, J. S. (2016). Rheological properties of viscoelastic drops on superamphiphobic substrates. Langmuir, 32(16), 4071-4076. https://doi.org/10.1021/acs.langmuir.6b00779

The rheological properties of microliter sized drops of polymer solutions were investigated using measurements of their mechanical vibrational response. Drops were suspended on superamphiphobic substrates and vibrated by the application of a short me... Read More about Rheological properties of viscoelastic drops on superamphiphobic substrates.

Watch your step!: a frustrated total internal reflection approach to forensic footwear imaging (2016)
Journal Article
Needham, J., & Sharp, J. S. (2016). Watch your step!: a frustrated total internal reflection approach to forensic footwear imaging. Scientific Reports, 6, Article 21290. https://doi.org/10.1038/srep21290

Forensic image retrieval and processing are vital tools in the fight against crime e.g. during fingerprint capture. However, despite recent advances in machine vision technology and image processing techniques (and contrary to the claims of popular f... Read More about Watch your step!: a frustrated total internal reflection approach to forensic footwear imaging.

Mechanical vibrations of pendant liquid droplets (2015)
Journal Article
Temperton, R. H., Smith, M. I., & Sharp, J. S. (2015). Mechanical vibrations of pendant liquid droplets. European Physical Journal E, 38, Article 79. https://doi.org/10.1140/epje/i2015-15079-2

A simple optical deflection technique was used to monitor the vibrations of microlitre pendant droplets of deuterium oxide, formamide, and 1,1,2,2-tetrabromoethane. Droplets of different volumes of each liquid were suspended from the end of a microli... Read More about Mechanical vibrations of pendant liquid droplets.

3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling (2015)
Journal Article
Bailey, J., Havelund, R., Shard, A. G., Gilmore, I. S., Alexander, M. R., Sharp, J. S., & Scurr, D. J. (2015). 3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling. ACS Applied Materials and Interfaces, 7(4), 2654-2659. https://doi.org/10.1021/am507663v

ToF-SIMS imaging with argon cluster sputter depth profiling has provided detailed insight into the three-dimensional (3D) chemical composition of a series of polymer multilayer structures. Depths of more than 15 μm were profiled in these samples whil... Read More about 3D ToF-SIMS Imaging of Polymer Multilayer Films Using Argon Cluster Sputter Depth Profiling.

High-frequency acousto-optic effects in Bragg reflectors (2014)
Journal Article
Farmer, D., Akimov, A. V., Gippius, N., Bailey, J., Sharp, J. S., & Kent, A. (2014). High-frequency acousto-optic effects in Bragg reflectors. Optics Express, 22(12), 15218-15231. https://doi.org/10.1364/OE.22.015218

Picosecond acoustic interferometry was used to study the acousto-optic properties of a distributed Bragg reflector (DBR) manufactured from two immiscible polymers (cellulose acetate and polyvinylcarbyzole). Picosecond strain pulses were injected into... Read More about High-frequency acousto-optic effects in Bragg reflectors.

Mechanical vibrations of magnetically levitatedviscoelastic droplets (2014)
Journal Article
Temperton, R. H., Hill, R. J., & Sharp, J. S. (2014). Mechanical vibrations of magnetically levitatedviscoelastic droplets. Soft Matter, 10(29), 5375-5379. https://doi.org/10.1039/c4sm00982g

The mechanical vibrations of magnetically levitated droplets were investigated using a simple optical deflection technique. Droplets of water and a water-based solution of poly(acrylamide-co-acrylic acid) were levitated in the bore of a superconducti... Read More about Mechanical vibrations of magnetically levitatedviscoelastic droplets.

Origin of contact line forces during the retraction of dilute polymer solution drops (2014)
Journal Article