Water Promotes Melting of a Metal-Organic Framework.

Water is one of the most reactive and abundant molecules on Earth, and it is thus crucial to understand its reactivity with various material families. One of the big unknown questions is how water in liquid and vapor forms impact the fast-emerging class of metal-organic frameworks (MOFs). Here, we discover that high-pressure water vapor drastically modifies the structure and hence the dynamic, thermodynamic, and mechanical properties of MOF glasses. In detail, we find that an archetypical MOF (ZIF-62) is extremely sensitive to heat treatments performed at 460 °C and water vapor pressures up to ∼110 bar. Both the melting and glass transition temperatures decrease remarkably (by >100 °C), and simultaneously, hardness and Young's modulus increase by up to 100% under very mild treatment conditions (<20 bar of hydrothermal pressure). Structural analyses suggest water to partially coordinate to Zn in the form of a hydroxide ion by replacing a bridging imidazolate-based linker. The work provides insight into the role of hot-compressed water in influencing the structure and properties of MOF glasses and opens a new route for systematically changing the thermodynamics and kinetics of MOF liquids and thus altering the thermal and mechanical properties of the resulting MOF glasses.

Beam damage in operando X-ray diffraction studies of Li-ion batteries.

Operando powder X-ray diffraction (PXRD) is a widely employed method for the investigation of structural evolution and phase transitions in electrodes for rechargeable batteries. Due to the advantages of high brilliance and high X-ray energies, the experiments are often carried out at synchrotron facilities. It is known that the X-ray exposure can cause beam damage in the battery cell, resulting in hindrance of the electrochemical reaction. This study investigates the extent of X-ray beam damage during operando PXRD synchrotron experiments on battery materials with varying X-ray energies, amount of X-ray exposure and battery cell chemistries. Battery cells were exposed to 15, 25 or 35 keV X-rays (with varying dose) during charge or discharge in a battery test cell specially designed for operando experiments. The observed beam damage was probed by µPXRD mapping of the electrodes recovered from the operando battery cell after charge/discharge. The investigation reveals that the beam damage depends strongly on both the X-ray energy and the amount of exposure, and that it also depends strongly on the cell chemistry, i.e. the chemical composition of the electrode.

A Framework for Standardizing Emergency Nursing Education and Training Across a Regional Health Care System: Programming, Planning, and Development via International Collaboration.

INTRODUCTION: The challenges related to providing continuing education and competence management for emergency nurses are not unique to any one organization, health system, or geographic location. These shared challenges, along with a desire to ensure high-quality practice of emergency nursing, were the catalyst for an international collaboration between emergency nurse leaders in Region Zealand, Denmark, and nurse leaders and educators from a large academic medical center in Boston, Massachusetts. The goal of the collaboration was to design a competency-based education framework to support high-quality emergency nursing care in Region Zealand. The core objectives of the collaboration included the following: (1) elevation of nursing practice, (2) development of a sustainable continuing education framework, and (3) standardization of training and nursing practice across the 4 emergency departments in Region Zealand. METHODS: To accomplish the core objectives, a multi-phased strategic approach was implemented. The initial phase, the needs assessment, included semi-structured interviews, a self-evaluation of skills of all regional emergency nurses, and a survey regarding nursing competency completed by emergency nurse leadership. Two hundred ninety emergency nurses completed the self-evaluation. The survey results were utilized to inform the strategic planning and design of a regional competency-based education framework. RESULTS: In 18 months, and through an international collaboration, emergency nursing education, training, and evaluation tools were developed and integrated into the 4 regional emergency departments. Initial feedback indicates that the education has had a positive impact. The annual competency day program has continued through 2021 and is now fully institutionalized within the regional emergency nursing continuing education program. Furthermore, use of this innovative education framework has expanded beyond the emergency department to other regional nursing specialties. DISCUSSION AND CONCLUSION: Through this unique collaboration with regional and international participants, a sustainable, regional emergency nursing education program was developed that has elevated and standardized the practice of emergency nurses in Region Zealand, Denmark. This program development can serve as a model for region-wide or health care system-wide collaborations in other countries.