Electronic threshold switching of As-embedded SiO selectors: charged oxygen vacancy model.

Sneak current issues in crossbar arrays of non-volatile memories can be effectively alleviated using threshold switching (TS)-based selectors. However, 1-selector-1-resistor integration requires coherence between the constituent materials and operational parameters of the two components. Here, we propose a highly coherent selector via in-depth investigation of the operation process of a fab-friendly As-SiO selector unit.

Microplastics as adsorbent for Pb and Cd: A comparative study of polypropylene, polyvinyl chloride, high-density polyethylene, and low-density polyethylene.

Microplastics (MPs) in aquatic environments adsorb heavy metals, thereby posing potential environmental risks. However, further research is needed to elucidate the adsorption behavior of different types of MPs for various heavy metals. The aim of this study was to characterize four types of MPs: polypropylene (PP), polyvinyl chloride (PVC), high-density polyethylene (HDPE), and low-density polyethylene (LDPE).

Variations in mechanical and thermal properties of mesoporous alumina thin films due to porosity and ordered pore structure.

Ordered mesoporous aluminum oxide films with porosity ranging between 5% and 37% were synthesized by evaporation-induced self-assembly (EISA) using surfactant templating. To investigate the effects of mesoporous structure on thermal properties, changes in pore structure including pore size, pore distribution, and porosity were monitored as a function of surfactant concentration (Pluronic P-123, poly(ethylene oxide)(20)-poly(propylene oxide)(70)-poly(ethylene oxide)(20)). The ordered mesoporous alumina films were then examined to determine how their morphology influences their thermal properties.

Investigation of the effect of calcination temperature on HMDS-treated ordered mesoporous silica film.

To reduce signal delay in ultra-large-scale integrated circuits, an intermetal dielectric with low dielectric constant is required. Ordered mesoporous silica film is appropriate for use as an intermetal dielectric due to its low dielectric constant and superior mechanical properties. To reduce the dielectric constant, an ordered mesoporous silica film prepared by a tetraethoxysilane/methyltriethoxysilane silica precursor and Brij-76 block copolymer was surface-modified by hexamethyldisilazane (HMDS) treatment.

Investigation of the properties of organically modified ordered mesoporous silica films.

Organically modified, ordered mesoporous silica films, which can provide hydrophobicity and low polarizability to the framework, were prepared using Brij-76 block copolymer as a template. Due to a fast condensation reaction of the silica precursor, mesostructured silica films were not properly synthesized. To circumvent this problem, a synthesis procedure was modified to provide an enhancement of pore periodicity through the incorporation of methyl ligands on the framework.

Isolation and identification of dihydrochrysanolide and its 1-epimer from Chrysanthemum coronarium L.

A new sesquiterpene lactone (1) was isolated with known dihydrochrysanolide derivatives (2 and 3) from the flowers of Chrysanthemum coronarium L., and their structures were identified by spectroscopic data. The stereochemistry of the epimers (1 and 2) was determined from NOESY data and an X-ray crystallographic analysis.