RESUMO
Polar crystalline materials, a subset of the non-centrosymmetric materials, are highly sought after. Their symmetry properties make them pyroelectric and also piezoelectric and capable of second-harmonic generation (SHG). For SHG and piezoelectric applications, metal oxides are commonly used. The advantages of oxides are durability and hardness - downsides are the need for high-temperature synthesis/processing and often the need to include toxic metals. Organic polar crystals, on the other hand, can avoid toxic metals and can be amenable to solution-state processing. While the vast majority of polar organic molecules crystallize in non-polar space groups, we found that both 7-chloro-1,3,5-triazaadamantane, for short Cl-TAA, and also the related Br-TAA (but not I-TAA) form polar crystals in the space group R3m, easily obtained from dichloromethane solution. Measurements confirm piezoelectric and SHG properties for Cl-TAA and Br-TAA. When the two species are crystallized together, solid solutions form, suggesting that properties of future materials can be tuned continuously.
RESUMO
BACKGROUND: There is a pervasive mental health treatment gap for children across the globe. Engaging stakeholders in child mental health evidence-based treatment (EBT) implementation projects may increase the likelihood of successful EBT implementation, thereby better addressing the treatment gap. However, little is known about the extent of stakeholder engagement to inform the implementation of child mental health EBTs. METHODS: We conducted a scoping review to characterize stakeholder engagement in child mental health EBT implementation projects, including what stakeholders are engaged, how they are engaged, when they are engaged, where they are engaged (i.e., location of projects), why they are engaged, and the reported impacts of stakeholder engagement. We searched seven databases: MEDLINE, PsycInfo, Embase, ERIC, CINAHL Complete, Scopus, and Web of Science Core Collection. To be included, studies had to report on some form of stakeholder engagement that was undertaken to inform or explain the implementation of a child mental health EBT. We performed data extraction and synthesis to describe key study and stakeholder characteristics, stakeholder engagement methods and rationales, reported impacts of stakeholder engagement, and quality of reporting on stakeholder engagement. RESULTS: In total, 122 manuscripts met our inclusion criteria, from which we identified a total of 103 unique child mental health EBT implementation projects. Projects spanned 22 countries, which included low-, lower-middle, upper-middle, and high-income countries. The largest number of projects was in the USA and conducted in public mental health settings. Most projects engaged EBT providers during the active implementation phase and with limited depth, often gathering information from stakeholders without sharing decision-making power in implementation efforts. Across projects, impacts of stakeholder engagement spanned all of Proctor and colleague's implementation outcomes. CONCLUSIONS: Given that stakeholder engagement is often shallow and with limited shared decision-making, additional effort should be made to increase engagement to preempt challenges to EBT implementation and ensure implementation success. Such efforts may ensure the just distribution of power in EBT implementation efforts. TRIAL REGISTRATION: All procedures were pre-registered on the Open Science Framework prior to conducting the literature search (DOI 10.17605/OSF.IO/GR9AP ).