24 Matching Annotations
  1. Sep 2019
    1. It should be noted here that the substitution of LiTFSI forLiClO4could be expected to affect the reactions of polysuldesat the negative electrode surface; LiClO4, like LiNO3,isa powerful oxidising agent which may contribute to thepassivation of the negative electrode

      Testing with document hosted on MP.

  2. May 2019
    1. The metal is a solid material and metallic gray in color. Furthermore, the metal possess high melting and boiling points. At standard temperature and pressure, cobalt is not readily oxidized, which means it does not easily lose electrons from its surface.

      A description of cobalt.

    2. cobalt can be found among the d-block elements, transition metals. It has the chemical abbreviation Co and atomic number 27.

      Where to find cobalt on periodic table and cobalt's atomic number.

  3. Mar 2019
    1. A nano-porous carbon composite membrane has been found to display high water flux due to exceptionally high surface diffusion, together with an excellent salt rejection [2616, 2958].

      With an excellent ability to reject salt, how often does membrane fouling become an issue when desalinating seawater? to a point where it causes water flux decline and lowers the quality of the water produced.

      ~ Anthony Y.

    1. common oxidizing agents: Halogens (they favor gaining an electron to obtain noble gas configuration).

      • O2, O3, F2, Br2, H2SO4

      common reducing agents: Alkali metals (they favor losing an electron to obtain noble gas configuration).

      • H2, CO, Fe, Zn, Li
  4. Oct 2018
    1. are step-by-step descriptions of what occurs on a molecular level in chemical reactions. Each step of the reaction mechanism is known as an elementary process, a term used to describe a moment in the reaction when one or more molecules changes geometry or is perturbed by the addition or omission of another interacting molecule. Collectively, an overall reaction and a reaction mechanism consist of multiple elementary processes. These elementary steps are the basic building blocks of a complex reaction, and cannot be broken down any further.

      reaction mechanisms

  5. Jun 2018
  6. May 2018
  7. Mar 2018
    1. alembics
      1. Chem. An early apparatus used for distilling, consisting of two connected vessels, a typically gourd-shaped cucurbit (cucurbit n.1 1) containing the substance to be distilled, and a receiver or flask in which the condensed product is collected. Occasionally also: spec. the lid or head (head n.1 19f) of the cucurbit together with its tube or beak which connects the two vessels. Now hist. (from Oxford English Dictionary)
  8. Nov 2016
    1. Two new molecular catalysts of water oxidation have been synthesized by a team of brilliant scientists from the U.S. Department of Energy’s Brookhaven National Laboratory. These new molecular catalysts – complexes of ruthenium which are surrounded by the binding molecules, and they contain phosphonate groups.

  9. Jun 2016
    1. Title: The dying breed of craftsmen behind the tools that make scientific research possible - LA Times

      Keywords: government-funded research opened, snake glass coils, fuse glass beakers, organic chemistry, research hubs, world war, experienced glassblowers, glassblowers remain, church laboratory, befallen glassblowing, glass manufacturer, glass technicians, cost-cutting world, jobs tend, entry-level jobs

      Summary: Hunkered down in the sub-basement of the Norman W. Church Laboratory for Chemical Biology, underneath a campus humming with quantum teleportation devices, gravity wave detectors and neural prosthetics, Rick Gerhart chipped away at a broken flask.<br>Peering into the dancing flames, he examined his work for wrinkles — imperfections invisible to the untrained eye.<br>“It not only should be functional,” he said, smoothing the rim with a carbon rod, “it has to look good.”<br>Here in Caltech’s one-man glass shop, where Gerhart transforms a researcher’s doodles into intricate laboratory equipment, craftsmanship is king.<br>In a cost-cutting world of machines and assembly plants, few glassblowers remain with the level of mastery needed at research hubs like Caltech.<br>“He’s a somewhat dying breed,” said Sarah Reisman, who relied on Gerhart to create 20 maze-like contraptions for her synthetic organic chemistry lab.<br>Rick Gerhart, scientific glass blower at Caltech, has been helping to make scientific research possible at the campus since 1992.<br>(Dillon Deaton/Los Angeles Times)<br>Similar fates have befallen glassblowing at UCLA and NASA’s Jet Propulsion Laboratory.<br>Across the U.S., those who land such jobs tend to stay until retirement.<br>He chuckled: “Looks like we have to steal somebody.”<br>To master scientific glassblowing, proper training and apprenticeships are key.<br>In addition to the hands-on training, which requires a knack for precision as well as coordination, students must take courses in organic chemistry, math and computer drawing.<br>So it really takes a long time to get to a position like Rick’s.”<br>Gerhart enrolled in the Salem program in 1965, after dropping out of college to give his father’s profession a try.<br>The craft, which dates back to alchemy in the 2nd century, took hold in America by the 1930s and 1940s, after World War I cut off glassware supply from Germany.<br>The profession peaked after World War II, when booms in oil and government-funded research opened up numerous glassblowing jobs in many a lab.<br>At first, Gerhart hopped around a number of firms and worked alongside more experienced glassblowers at TRW Inc. and UCLA.<br>When he settled at Caltech in 1992, the glassblower before him handed over the key to the shop and said, “Good luck.” On his own, Gerhart pieced together his patchwork of experience to twist and fuse glass beakers and snake glass coils over vacuum chambers.<br>“That’s when I really started learning.”<br>Social media videos have sparked new interest in the craft, Briening said.<br>But while his students have no trouble getting entry-level jobs at companies like Chemglass Life Sciences, a glass manufacturer, and General Electric Global Research, rarely are universities willing to budget the overhead costs for more than one glassblower, if any.<br>“Years ago, all the universities had two or three people,” Briening said.<br>One of the few resources left for the next generation is the American Scientific Glassblowers Society, a close-knit group that hosts national workshops and swaps ideas when a researcher’s custom order stumps one of its members.<br>Its members also serve as Caltech’s best — and possibly only — options once Gerhart leaves.<br>“Rick’s one of those glass technicians that I put in the top 5%,” Ponton said.<br>

    1. The four new synthetic elements have been named.<br> 113 nihonium (Nh)<br> 115 moscovium (Mc)<br> 117 tennessine (Ts)<br> 118 oganesson (Og)

  10. May 2016
    1. After hundreds of emails with developers and peer-reviewers, his open-source book will be ready for use at UConn. Neth began planning for the second version of the book in January and the project has taken more than four months.
  11. Jan 2016
    1. Elements 113, 115, 117, and 118 were recently produced in laboratories. 114 and 116 were created about five years ago. There is a petition to name one of the new elements Lemmium, after rock musician Lemmy Kilmister, who died 28 December 2015. It has 133,465 signatures so far.

      NPR<br> https://twitter.com/LemmiumMetal