Luminescence and associated effector activity in Pyrosoma (Tunicata: Pyrosomida)

1978 ◽  
Vol 202 (1149) ◽  
pp. 483-495 ◽  
Keyword(s):  
Light Emission ◽  
Mechanical Stimuli ◽  
Luminescent Bacteria ◽  
Effector Activity

The behaviour, histology, and ciliary and luminescent responses of Pyrosoma tetrazooids are described. Each zooid contains paired luminous organs made up of large cells packed with organelles that are concluded to be intracellular luminescent bacteria. Light emission can be evoked by photic or mechanical stimuli, and is always preceded (with a latency of at least 600 ms) by arrests of the ciliary cells of the gill bars, and con­comitant ciliary arrest potentials. The gill bars are innervated by axons running under the ciliary cells; the luminous organs are not innervated. Ciliary arrests are evoked by photic stimuli and this appears to be the basis for transmission of light emission between zooids.

scholarly journals Photoluminescence and electrical properties in Pr-modified (Ba1-xCax)TiO3 multifunctional ceramics

2020 ◽  
Vol 14 (1) ◽  
pp. 77-82
Author(s):  
Miroslaw Bucko ◽  
Agnieszka Wilk ◽  
Jerzy Lis ◽  
Anna Toczek ◽  
Lucjan Kozielski
Keyword(s):  
Light Emission ◽  
Mechanical Energy ◽  
Red Light ◽  
Calcium Content ◽  
Ceramic Materials ◽  
Direct Conversion ◽  
Calcium Titanate ◽  
Mechanical Stimuli ◽  
Wet Chemistry ◽  
Thermal Light

Mechanoluminescence materials, characterized with non-thermal light emission in response to mechanical stimuli, can have many applications in direct conversion of mechanical energy into light energy. The aim of this study was to develop wet chemistry approaches for the synthesis of the finest ceramic powders of barium calcium titanate for the use in the production of a mechanoluminescent detector. Wet chemistry route allows the control of the particle size of ceramic materials up to several nanometers. For the first time luminescence was recorded in Ba0.9Ca0.1TiO3 ceramics despite reports that light emission in BCT is possibly only over 23% of calcium content. The resulting ceramics showed high relative density, reasonable ferro and dielectric properties, and red light emission can be observed with the naked eye.

Multifunctional Mechano-Luminescent-Optoelectronic Composites for Self-Powered Strain Sensing

2017 ◽  
Author(s):  
Elias Pulliam ◽  
George Hoover ◽  
Donghyeon Ryu
Keyword(s):  
Light Emission ◽  
Strain Sensor ◽  
Mechanical Stimuli ◽  
Strain Sensing ◽  
Glass Slides ◽  
Close Proximity ◽  
External Power ◽  
Self Powered ◽  
Dc Sensor ◽  
Elastomeric Composites

Aerospace mechanical structures encounter various forms of damage throughout their operation due to mechanical stimuli. Structural health monitoring (SHM) is suggested as a way to actively check the integrity of a component by using a system of sensors. However, these conventional sensors can often require external power that is not always readily available in aerospace, thus the development of self-powered sensors could prove beneficial for SHM applications. In this study, the design of multifunctional mechano-luminescent-optoelectronic (MLO) composites strain sensor is suggested. The MLO composites sensor is composed of two transformative materials: 1) mechano-luminescent (ML) copper-doped zinc sulfide (ZnS:Cu) and 2) mechano-optoelectronic (MO) poly(3-hexylthiophene) (P3HT). ML ZnS:Cu emits light in response to mechanical stimuli. MO P3HT showed self-sensing capability by generating direct current (DC) sensor signal under light. First, ZnS:Cu ML crystals will be embedded in polydimethylsiloxane (PDMS) matrix to fabricate ZnS:Cu/PDMS elastomeric composites. ML light emission characteristics of ZnS:Cu/PDMS will be studied by subjecting the ZnS:Cu/PDMS to cyclic tensile strain loadings while videos are recorded of the light emission. The data are analyzed using a statistical factorial methodology so that a regression model to predict light emission based on loading strain and frequency can be calculated. Second, MO P3HT-based self-sensing thin films will be fabricated on glass slides using a spin-coating technique. Last, self-powered sensing capability of the MLO composites strain sensor will be validated by measuring DC voltage (DCV) in close proximity of the ZnS:Cu/PDMS subjected to cyclic tensile loadings.

scholarly journals Triboluminescence Phenomenon Based on the Metal Complex Compounds—A Short Review

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7142
Author(s):  
Adam Szukalski ◽  
Adam Kabanski ◽  
Julia Goszyk ◽  
Marek Adaszynski ◽  
Milena Kaczmarska ◽  
...  
Keyword(s):  
Metal Complex ◽  
Light Emission ◽  
Short Review ◽  
Spectroscopic Properties ◽  
Triphenylphosphine Oxide ◽  
Complex Compounds ◽  
Mechanical Stimuli ◽  
Radiation Mechanism ◽  
Triphenylphosphine Complex ◽  
Available Information

Triboluminescence (TL) is a phenomenon of light emission resulting from the mechanical force applied to a substance. Although TL has been observed for many ages, the radiation mechanism is still under investigation. One of the exemplary compounds which possesses triboluminescent properties are copper(I) thiocyanate bipyridine triphenylphosphine complex [Cu(NCS)(py)2(PPh3)], europium tetrakis dibenzoylmethide triethylammonium EuD4TEA, tris(bipyridine)ruthenium(II) chloride [Ru(bpy)3]Cl2, and bis(triphenylphosphine oxide)manganese(II) bromide Mn(Ph3PO)2Br2. Due to the effortless synthesis route and distinct photo- and triboluminescent properties, these compounds may be useful model substances for the research on the triboluminescence mechanism. The advance of TL studies may lead to the development of a new group of sensors based on force-responsive (mechanical stimuli) materials. This review constitutes a comprehensive theoretical study containing available information about the coordination of metal complex synthesis methodologies with their physical, chemical, and spectroscopic properties.

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