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1.
Article in English | MEDLINE | ID: mdl-38886025

ABSTRACT

ISSUE ADDRESSED: Communication tools have long been used to address complex social policy problems, known as wicked problems, in communities around the world. However, the challenge has remained, how do we measure the impact of social change with communication for development (C4D)? Evaluators recommend utilising evaluation tools that take a wider systems-based approach to assist in the evaluation of C4D projects. Health Communication Resources (HCR) Inc., a health promotion charity that supports C4D projects around the world, aimed to trial a tool to assist evaluation of a project addressing gender inequality, an underlying driver of family violence in the community. METHODS: WickedLab's tool for systemic change was utilised to assist the evaluation of the complex adaptive system. The research team mapped the system that existed in Geraldton working towards addressing the wicked problem of gender inequality. RESULTS: Mapping the system highlighted how integral C4D actions were in maintaining and strengthening the system as it works together towards gender equality in the community. CONCLUSION: A systems-based approach can strengthen evaluation and demonstrates the role C4D projects play in addressing wicked problems in a defined location. SO WHAT?: WickedLab's tool for systemic change provides significant potential for the evaluation of other health promotion and communication for development projects.

2.
Adv Sci (Weinh) ; 11(10): e2306561, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38145339

ABSTRACT

Palladium films hold signicance due to their remarkable affinity for hydrogen diffusion, rendering them valauble for the seperation and purification of hydrogen in membrane reactors. However, palladium is expensive, and its films can become brittle after only a few cycles of hydrogen separation. Alloying with silver has been shown to overcome the problem of palladium embrittlement. Palladium-silver films have been produced via several methods but all have drawbacks, such as difficulties controlling the alloy composition. This study explores two promising jet printing methods: Inkjet and Aerosoljet. Both methods offer potential advantages such as direct patterning, which reduces waste, enables thin film production, and allows for the control of alloy composition. For the first time, palladium-silver alloys have been produced via inkjet printing using a palladium-silver metal organic decomposition (MOD) ink, which alloys at a temperature of 300 °C with nitrogen. Similarly, this study also demonstrates a pioneering approach for Aerosol Jet printing, showing the potential of a novel room-temperature method, for the deposition of palladium-silver MOD inks. This low temperature approach is considered an important development as palladium-silver MOD inks are originally designed for deposition on heated substrates.

3.
Materials (Basel) ; 16(3)2023 Feb 01.
Article in English | MEDLINE | ID: mdl-36770266

ABSTRACT

Particle size and morphology analysis is a problem common to a wide range of applications, including additive manufacturing, geological and agricultural materials' characterisation, food manufacturing and pharmaceuticals. Here, we review the use of microfocus X-ray computed tomography (X-ray CT) for particle analysis. We give an overview of different sample preparation methods, image processing protocols, the morphology parameters that can be determined, and types of materials that are suitable for analysis of particle sizes using X-ray CT. The main conclusion is that size and shape parameters can be determined for particles larger than approximately 2 to 3 µm, given adequate resolution of the X-ray CT setup. Particles composed of high atomic number materials (Z > 40) require careful sample preparation to ensure X-ray transmission. Problems occur when particles with a broad range of sizes are closely packed together, or when particles are fused (sintered or cemented). The use of X-ray CT for particle size analysis promises to become increasingly widespread, offering measurements of size, shape, and porosity of large numbers of particles within one X-ray CT scan.

4.
J Digit Imaging ; 35(4): 743-753, 2022 08.
Article in English | MEDLINE | ID: mdl-35386033

ABSTRACT

An increased number of healthcare providers across the continuum of care share responsibility for providing treatment and care to the patient. Treatment is often provided at community-based facilities and not necessarily at the hospital that performed the imaging. As a result, there is an increased dependency on readily available access to a patient's longitudinal imaging records. The ways in which diagnostic images and results are exchanged among providers within a patient's circle of care have expanded. This article explores three varieties of image exchange. First, we examine image exchange patterns within a regional Diagnostic Imaging Repository and identify missed sharing opportunities. Secondly, we explore the use of a regional clinical viewer widely used in southwestern Ontario, called ClinicalConnect™, and examine the adoption of the viewer by providers. Finally, the paper provides a high-level look at how patients can leverage patient portals to view their imaging data to empower their healthcare experience.


Subject(s)
Health Information Exchange , Patient Portals , Delivery of Health Care , Electronic Health Records , Health Personnel , Humans , Ontario
5.
Mater Sci Eng C Mater Biol Appl ; 131: 112476, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34857261

ABSTRACT

Corneal opacities are the 4th leading cause of blindness, and the only current treatment method is the replacement of damaged tissue with a donor cornea. The worldwide shortage of donor eye bank tissue has influenced research into biomaterial substrates for both partial and full thickness corneal implantation. Here, polymer hydrogels based on natural peptides, poly-ɛ-lysine and gellan gum, can be manufactured using reactive inkjet printing (RIJ). The inks used for printing were optimised based on their rheological properties. Printing alternating layers of ink forms a unique surface pattern, based on the immediate formation of ionic bonds between polymers of opposing charges. This surface pattern resembles a repeating honeycomb-like structure, visible by both optical and scanning electron microscopy. The structure of the printed hydrogels can be modified to include pores, a feature of interest for the tissue engineering of full thickness corneal constructs. Printed poly-ɛ-lysine/gellan gum hydrogels demonstrated a transparency of 80% and cyto-compatibility with both corneal epithelial and endothelial cells. Both corneal cell types demonstrated cell attachment across the surface of the printed hydrogel arrays, displaying their typical cell morphology. This gives confidence of the cyto-compatibility of these hydrogels in vitro. Reactive inkjet printing can produce 3D structures with a high resolution, producing printed tracks in the micron range. Additionally, RIJ demonstrates versatility, as constructs can be tailored to meet various dimension and thickness requirements. Furthermore, this work demonstrates for the first time that reactive inkjet printing can been used to produce hydrogel constructs based on these two inks, with the aim of producing constructs for corneal tissue engineering.


Subject(s)
Hydrogels , Lysine , Cornea , Endothelial Cells , Polysaccharides, Bacterial , Printing, Three-Dimensional , Tissue Engineering
6.
Bioelectrochemistry ; 134: 107499, 2020 Aug.
Article in English | MEDLINE | ID: mdl-32179453

ABSTRACT

An "indirect" photo-electrochemical sensor is presented for the measurement of a mixture of analytes including reducing sugars (e.g. glucose, fructose) and non-reducing sugars (e.g. sucrose, trehalose). Its innovation relies on the use of a palladium film creating a two-compartment cell to separate the electrochemical and the photocatalytic processes. In this original way, the electrochemical detection is separated from the potential complex matrix of the analyte (i.e. colloids, salts, additives, etc.). Hydrogen is generated in the photocatalytic compartment by a Pt@g-C3N4 photocatalyst embedded into a hydrogen capture material composed of a polymer of intrinsic microporosity (PIM-1). The immobilised photocatalyst is deposited onto a thin palladium membrane, which allows rapid pure hydrogen diffusion, which is then monitored by chronopotentiometry (zero current) response in the electrochemical compartment. The concept is demonstrated herein for the analysis of sugar content in commercial soft drinks. There is no requirement for the analyte to be conducting with electrolyte or buffered. In this way, samples (biological or not) can be simply monitored by their exposition to blue LED light, opening the door to additional energy conversion and waste-to-energy applications.


Subject(s)
Hydrogen/chemistry , Membranes, Artificial , Nitriles/chemistry , Palladium/chemistry , Photochemical Processes , Platinum/chemistry , Sugars/analysis , Catalysis , Electrochemistry , Polymers/chemistry , Porosity , Sugars/chemistry
7.
Adv Sci (Weinh) ; 6(19): 1900719, 2019 Oct 02.
Article in English | MEDLINE | ID: mdl-31592411

ABSTRACT

Carbon and carbon/metal systems with a multitude of functionalities are ubiquitous in new technologies but understanding on the nanoscale remains elusive due to their affinity for interaction with their environment and limitations in available characterization techniques. This paper introduces a spectroscopic technique and demonstrates its capacity to reveal chemical variations of carbon. The effectiveness of this approach is validated experimentally through spatially averaging spectroscopic techniques and using Monte Carlo modeling. Characteristic spectra shapes and peak positions for varying contributions of sp2-like or sp3-like bond types and amorphous hydrogenated carbon are reported under circumstances which might be observed on highly oriented pyrolytic graphite (HOPG) surfaces as a result of air or electron beam exposure. The spectral features identified above are then used to identify the different forms of carbon present within the metallic films deposited from reactive organometallic inks. While spectra for metals is obtained in dedicated surface science instrumentation, the complex relations between carbon and metal species is only revealed by secondary electron (SE) spectroscopy and SE hyperspectral imaging obtained in a state-of-the-art scanning electron microscope (SEM). This work reveals the inhomogeneous incorporation of carbon on the nanoscale but also uncovers a link between local orientation of metallic components and carbon form.

8.
RSC Adv ; 9(67): 39143-39146, 2019 Nov 27.
Article in English | MEDLINE | ID: mdl-35540660

ABSTRACT

A reactive ink (Ink 1) containing Ti(OPri)4 in PriOH with dimethoxyethan as a kinetic stabiliser deposits TiO2 by inkjet printing. A hybrid ink (Ink 2) consists of Ink 1 with the addition of anatase NPs, which act as seeds for the formation of anatase TiO2 at 200 °C. Printing of anatase on PET is also reported.

9.
Sci Rep ; 6: 20814, 2016 Feb 09.
Article in English | MEDLINE | ID: mdl-26857286

ABSTRACT

Inkjet printing offers an attractive method for the deposition of metal interconnects in electronic systems and enables a low-cost, environmentally friendly route to manufacture. However, virtually all current metal inkjet processes require post-deposition sintering treatments to achieve the optimum electrical conductivity, because the growth mechanism involves coalescence of discrete nanoparticles. A manufacturing process that reduces the number of steps by directly printing silver, removing the need to sinter the printed metal, would be highly advantageous. Here we describe a, sinter-free process that results in the direct printing of crystalline silver. This process exploits the chemistries developed for Atomic Layer Deposition (ALD), to form the basis of a new ink formulation, which we term; Reactive Organometallic inks (ROM). These ROM ink formulations are capable of depositing low temperature, high conductivity metal films, without the need for subsequent sintering treatments. To reduce the temperature for direct formation of metallic Ag, we have added an alcohol as a catalytic reducing agent to dissociate the organometallic component. Silver films printed from our novel ROM ink, on a glass substrate at 120 °C, are electrically conductive with a typical resistivity as low as 39.2% that of bulk silver, without the need for sintering.

10.
Inorg Chem ; 50(22): 11644-52, 2011 Nov 21.
Article in English | MEDLINE | ID: mdl-22017450

ABSTRACT

Thin films of ceria (CeO(2)) have many applications, and their synthesis by liquid-injection MOCVD (metal-organic chemical vapor deposition) or ALD (atomic layer deposition) requires volatile precursor compounds. Here we report the synthesis of a series of homoleptic and heteroleptic Ce(IV) complexes with donor-functionalized alkoxide ligands mmp (1-methoxy-2-methylpropan-2-olate), dmap (1-(dimethylamino)propan-2-olate), and dmop (2-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)propan-2-olate) and their potential as precursors for MOCVD and ALD of CeO(2). New complexes were synthesized by alcohol exchange reactions with [Ce(OBu(t))(4)]. [Ce(mmp)(4)] and [Ce(dmap)(4)] were both found to be excellent precursors for liquid-injection MOCVD of CeO(2), depositing high purity thin films with very low carbon contamination, and both have a large temperature window for diffusion controlled growth (350-600 °C for [Ce(mmp)(4)]; 300-600 °C for [Ce(dmap)(4)]). [Ce(mmp)(4)] is also an excellent precursor for liquid-injection ALD of CeO(2) using H(2)O as oxygen source and demonstrates self-limiting growth from 150 to 350 °C. [Ce(dmap)(4)] has lower thermal stability than [Ce(mmp)(4)] and does not show self-limiting growth in ALD. Heteroleptic complexes show a tendency to undergo ligand redistribution reactions to form mixtures in solution and are unsuitable as precursors for liquid-injection CVD.

11.
Chem Commun (Camb) ; (43): 6661-3, 2009 Nov 21.
Article in English | MEDLINE | ID: mdl-19865683

ABSTRACT

Gold nanoparticles are obtained by reduction of a Au(iii) precursor within an agarose hydrogel where they form percolating networks upon partial dehydration and shrinkage of the gel.

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