A5039614562- Nonlinear Optical Materials Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Materials and Mechanics
- Analytical Chemistry and Sensors
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Radiation Detection and Scintillator Technologies
- Electrochemical sensors and biosensors
- Electron and X-Ray Spectroscopy Techniques
- Luminescence and Fluorescent Materials
- Micro and Nano Robotics
- Particle Detector Development and Performance
- Advanced Sensor and Energy Harvesting Materials
- Microfluidic and Capillary Electrophoresis Applications
- 3D Printing in Biomedical Research
- Photochromic and Fluorescence Chemistry
- Nanofabrication and Lithography Techniques
- Electrowetting and Microfluidic Technologies
- Advanced Chemical Sensor Technologies
- Additive Manufacturing and 3D Printing Technologies
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Surface Chemistry and Catalysis
- Photocathodes and Microchannel Plates
Advanced Materials and BioEngineering Research
2021-2024
Trinity College Dublin
2011-2024
Dublin City University
2016-2021
University College Dublin
2018-2021
22q11 Ireland
2013-2018
University of Colorado Colorado Springs
1994
Royal Holloway University of London
1979
We describe the high resolution echelle spectrometer (HIRES) now in operation on Keck Telescope. HIRES, which is permanently located at a Nasmyth focus, standard in-plane with grating post dispersion. The collimated beam diameter 12', and 1 x 3 mosaic, 12' by 48' total size, of 52.6 gr mm<SUP>MIN1</SUP>, R-2.8 echelles. cross disperser 2 24' 16 ' size. camera unique new design: large (30' aperture) f/1.0, all spherical, fused silica, catadioptric system superachromatic performance. It spans...
With the advent of direct laser writing using two-photon polymerization, generation high-resolution three-dimensional microstructures has increased dramatically. However, development stimuli-responsive photoresists to create four-dimensional (4D) remains a challenge. Herein, we present supramolecular cholesteric liquid crystalline photonic photoresist for fabrication 4D microactuators, such as pillars, flowers, and butterflies, with submicron resolution. These micron-sized features display...
Abstract Stimuli‐responsive hydrogels have attracted much attention owing to the versatility of their programmed response in offering intelligent solutions for biomimicry applications, such as soft robotics, tissue engineering, and drug delivery. To achieve complexity biomimetic structures, two photon polymerization (2PP) has provided a means fabricating intricate 3D structures from stimuli‐responsive hydrogels. Rapid swelling hydrogel microstructures are advantageous osmotically driven...
Abstract Two photon polymerisation using direct laser writing is a burgeoning field of research, with recent focus being placed on bringing added value to microstructures, by incorporating soft, responsive polymers. Moving the micron‐scale can have profound impact such stimuli‐responsive materials, whose speed actuation be increased many‐fold compared their mm‐scale counterparts. Here, fabrication submicron 2D photonic structures, based vapor‐responsive photoresist refractive index <1.55,...
Soft, stimulus-responsive 3D structures created from crosslinked poly(ionic liquid)s (PILs) have been fabricated at unprecedented sub-micron resolution by direct laser writing (DLW). These absorb considerable quantities of solvent (e.g., water, alcohol, and acetone) to produce PIL hydrogels that exhibit behavior. Due their flexibility soft, responsive nature, these are much more akin biological systems than the conventional, highly crosslinked, rigid typically produced using 2-photon...
Over the past decade, progress in direct laser writing by two‐photon polymerization (DLW‐TPP) of stimuli‐responsive materials has made considerable inroads into realization microactuators. With focus on performing complex tasks such as walking, grasping, or delivering drugs, these actuators require a controlled preprogrammed actuation. Liquid crystalline microactuators enable programmed movement when mesogenic alignment can be successfully controlled. To date, this necessitated low crosslink...
Precision control of flow using photoresponsive hydrogels within fluidic channels was demonstrated by applying a PID algorithm.
This work reports on a low cost microfluidic electronic tongue (e-tongue) made with carbon interdigitated electrodes, printed paper, and coated boronic acid-containing hydrogels.
Abstract Hydrogels possess desirable properties for the additive manufacturing of 3D objects, but a significant challenge is to expand range hydrogel feedstocks with defined molecular structure and functionality while retaining mechanical properties. To this end, design photopolymerizable copolypeptides, derived from linear or star‐shaped architectures which can be tailored provide control over associated printing performance, are reported. Based on hydroxy ethyl‐L‐glutamine...
This paper describes apparatus for the direct measurement of statistics secondary electron emission, i.e. frequency distribution in number secondaries produced by individual primary particles. The method is to accelerate electrons about 50 keV and focus them on a cooled silicon semiconductor detector. Unless correction made adverse effect backscattering from detector (up 37%) resolution system does not reach expected value. A whereby these scattered are returned magnetic field described....
Using direct laser writing, arrays of optically responsive ionogel structures were fabricated. To demonstrate their nature, visible colour changes in the presence different solvent vapours investigated. This represents a new departure for photonic structural colouration, which fabricating structure shows programmable, controllable, and dynamic stimuli response.
Abstract Two‐photon direct laser writing enables the fabrication of shape‐changing microstructures that can be exploited in stimuli responsive micro‐robotics and photonics. The use Liquid Crystalline Networks (LCN) allows to realize 3D micrometric objects contract along a specific direction response stimuli, such as temperature or light. In this paper, free‐standing LCN is demonstrated graphical units smart tag for simple physical optical encryption. Using an array identical pixels,...
Novel paper-based impedance sensor for saccharide sensing in the sub-mM range.
Herein, a new class of polymerizable boronic acid (BA) monomers are presented, which used to generate soft hydrogels capable accurate determination saccharide concentration. By exploiting the interaction these cationic BAs with an anionic fluorophore, 8-hydroxypyrene-1,3,6-trisulfonic trisodium salt (pyranine), two-component sugar-sensing system was realized. In presence such (o-BA, m-BA, and p-BA), fluorescence pyranine becomes quenched because formation nonfluorescent BA–fluorophore...
A series of Ir(III) complexes, based on 1,10-phenanthroline featuring aryl acetylene chromophores, were prepared and investigated as triplet photosensitizers. The complexes synthesized by Sonogashira cross-coupling reactions using a "chemistry-on-the-complex" method. absorption properties luminescence lifetimes successfully tuned controlling the number type light-harvesting group. Intense UV/Vis was observed for with two groups at 3- 8-positions phenanthroline. asymmetric complex (with...
Herein we demonstrate the fabrication of arrays micropillars, achieved through combination direct laser writing and nanoimprint lithography. By combining two diacrylate monomers, polycaprolactone dimethacrylate (PCLDMA) 1,6-hexanediol (HDDA), copolymer formulations that, owing to varying ratios hydrolysable ester functionalities present in moiety, can be degraded presence base a controllable manner. As such, degradation micropillars tuned over several days as function PCLDMA concentration...
The DFT optimized 44BEP on metal (M) surfaces. change of binding energy (<italic>E</italic><sub>b</sub>) and distances (<italic>d</italic><sub>Br_sub</sub> <italic>d</italic><sub>N_sub</sub>) different surfaces will bring configurations self-assembling behaviours.
A description is given of a Monte Carlo method for the computation electron trajectories in solids. The calculations are based on Bethe energy loss law and Rutherford scattering equation. By assembling large number these trajectories, predictions made transmission, backscattering, angular distribution spectrum electrons passing through thin films. results good agreement with experimental data passage electrons, initially from 5 to 30 keV, aluminium, aluminium oxide, copper gold.
New supramolecular luminescent host systems based on 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), a triphenylamine acid, and amines (propylamine (1), dimethylaminopyridine, DMAP (2) (1S,2R)-2-amino-1,2-diphenylethanol (3)) were prepared using approach. For each, the inclusion of in CDPA matrix led to blue shifts solid state luminescence. 1 forms CH3CN-selective, exhibits solvent dependent changes state. Crystallisation CDPA-DMAP from EtOAc (2a) CH3CN (2b) produces two different...
Herein we demonstrate the ability to control swelling and photo-induced shrinking kinetics of hydrogels by changing polymerisation solvent.
Herein, we present the synthesis of linear photochromic norbornene polymers bearing spiropyran side groups (poly(SP-R)) and their assembly into layer-by-layer (LbL) films on glass substrates when converted to poly(MC-R) under UV irradiation. The LbL were composed bilayers poly(allylamine hydrochloride) (PAH) poly(MC-R), forming (PAH/poly(MC-R))n coatings. merocyanine (MC) form presents a significant absorption band in visible spectral region, which allowed tracking deposition process by...