Supported ammonia borane decomposition through enhanced homopolar B-B coupling.

The thermolytic decomposition of ammonia borane (AB) is known to proceed through the polymeric coupling reaction between -BH3 and -NH3 sites of multiple ammonia borane molecules, which results in the release of hydrogen and other by-products, e.g., ammonia, diborane and borazine.

Formulation of Aminosilica Adsorbents into 3D-Printed Monoliths and Evaluation of Their CO Capture Performance.

Amine-based materials have represented themselves as a promising class of CO adsorbents; however, their large-scale implementation requires their formulation into suitable structures. In this study, we report formulation of aminosilica adsorbents into monolithic structures through a three-dimensional (3D) printing technique. In particular, 3D-printed monoliths were fabricated using presynthesized silica-supported tetraethylenepentamine (TEPA) and poly(ethylenimine) (PEI) adsorbents using three different approaches.

Sonographic evaluation of uterine volume and its clinical importance.

Aim: The study was conducted to: (i) measure uterine volume in adolescent and perimenopausal age groups with normal pelvic findings and in women with pathological uteri scheduled for surgery, and (ii) utilize uterine volume as a parameter for the management of perimenopausal women scheduled for vaginal hysterectomy.

Methods: Data of 800 clinically non-gravid uteri of 16 weeks or smaller size with benign pathology scheduled for vaginal hysterectomy, and 150 adolescent women and 150 perimenopausal aged women with clinically and sonographically normal pelvic findings with normal uteri from the authors private practices were studied to find related sonographic uterine volume. Cases clinically more than 16 weeks size were not included in the study.

3D-Printed Zeolite Monoliths for CO Removal from Enclosed Environments.

Structured adsorbents, especially in the form of monolithic contactors, offer an excellent gas-solid contacting strategy for the development of practical and scalable CO capture technologies. In this study, the fabrication of three-dimensional (3D)-printed 13X and 5A zeolite monoliths with novel structures and their use in CO removal from air are reported. The physical and structural properties of these printed monoliths are evaluated and compared with their powder counterparts.

Aminosilane-Grafted Zirconia-Titiania-Silica Nanoparticles/Torlon Hollow Fiber Composites for CO2 Capture.

In this work, the development of novel binary and ternary oxide/Torlon hollow fiber composites comprising zirconia, titania, and silica as amine supports was demonstrated. The resulting binary (Zr-Si/PAI-HF, Ti-Si/PAI-HF) and ternary (Zr-Ti-Si/PAI-HF) composites were then functionalized with monoamine-, diamine-, and triamine-substituted trialkoxysilanes and were evaluated in CO2 capture. Although the introduction of both Zr and Ti improved the CO2 adsorption capacity relative to that with Si/PAI-HF sorbents, zirconia was found to have a more favorable effect on the CO2 adsorption performance than titania, as previously demonstrated for amine sorbents in the powder form.