Abstract:
A chemical indicator comprises a particulate inorganic substrate, and at least one reactive dye or ink coated on and/or impregnated within the particulate inorganic substrate. Coating and/or impregnating at least one reactive dye or ink on or within a particulate inorganic substrate improves the storage stability and/or thermal stability of the at least one reactive dye or ink, which typically comprises relatively unstable compounds. This allows the present indicators to be incorporated into thermoplastic polymer materials and processed conventionally while maintaining the efficacy and stability of the new indicators. The indicators provide simple, reliable, and cost effective detection means for detecting analytes such as ammonia, carbon dioxide, and oxygen, and may find use in applications such as food packaging and medical applications.
Abstract:
A chemical indicator or ink, and methods for manufacture thereof, comprises at least one carbon dioxide-sensitive reactive dye which is capable of detecting changes in carbon dioxide concentration in a fluid under fluid and/or gas phase pressure of carbon dioxide above approximately (1) bar. The present chemical indicators or inks are useful in the monitoring of relatively high carbon dioxide pressure environments, such as in carbonated drinks. The present invention also relates to containers for holding a carbonated liquid, and closures therefore, comprising a carbon dioxide indicator or a carbon dioxide-sensitive ink, wherein the carbon dioxide indicator and/or the ink comprises at least one carbon dioxide-sensitive reactive dye which is capable of detecting changes in carbon dioxide concentration in a fluid under fluid and/or gas phase pressure of carbon dioxide above approximately (1) bar.
Abstract:
A UV radiation (UVR) response indicator comprises a first UVB and/or UVA radiation sensitive material which has been modified so as to display an altered characteristic in a delayed manner in response to UVB and/or UVA radiation exposure. The UV indicator is capable of displaying exposure to increased UV radiation over a period of time. The present invention also relates to a method of displaying a relative amount of exposure to UVR by a UV indicator over a period of time. The invention is particularly useful in detecting the level of exposure to sunlight or sunbed radiation.
Abstract:
Packaging including an oxygen-scavenging element including an activatable semiconductor, in embodiments, one or both of a photo-activatable semiconductor activatable by ultra-bandgap light or an electro-activatable semiconductor activatable by application of an electrical bias, which, when activated, acts to scavenge oxygen from its surrounding environment.
Abstract:
The present invention relates to the provision of UV sensitive compositions and sensors comprising the compositions. The sensors can find use in a wide range of applications including as dosimeters for indicating the amount of exposure to UV light of a person or an article.
Abstract:
This invention relates to an irreversible indicator for detecting oxidising agents, or in particular an oxygen indicator, comprising at least one redox-sensitive dyestuff, at least one semiconductor material and at least one electron donor. This indicator is activated by exposure to light of about 200-400 nm. The invention also relates to a UV light detector.
Abstract:
This invention relates to an indicator for detecting a photocatalyst wherein the indicator comprises at least one redox-sensitive material and either at least one electron donor or at least one electron acceptor. The invention also relates to a method for detecting a photocatalyst using an indicator. In particular, the photocatalyst may be a semiconductor such as titanium dioxide on a glass substrate.
Abstract:
The present invention relates to a method of using a sensor-array to identify a vapour. The invention also relates to apparatus comprising a sensor-array to identify a vapour.
Abstract:
A method (1000) of operation of a storage system (100) includes: accessing a storage tier manager (106) coupled to a first tier storage (120) and a second tier storage (122); identifying a low activity region (304) in the first tier storage (120) and a high activity region (306) in the second tier storage (122); and exchanging a physical block region (602) corresponding to the high activity region (306) with the physical block region (602) corresponding to the low activity region (304) by the storage tier manager (106).
Abstract:
There is disclosed an indicator composition, the application thereof to substrates, and related products. The indicator composition comprises an organic solvent soluble polymer and a redox sensitive material which displays different visible properties in the oxidised and reduced forms, and a reducing agent or the oxidation product therefrom. The organic solvent soluble polymer can be at least partially sulfonated polystyrene. The indicator composition can be dissolved in organic solvents such as acetone, ethanol and ethyl acetate to form inks which can be used in a variety of printing processes. The indicator composition can be used to detect oxidising agents, oxygen, water, temperature and the passage of time.