By Steve Cohen
4.5
3333 ratings
The podcast currently has 148 episodes available.
In which we learn about the beginnings of chemistry applied to art conservation, from the initial attempts by Edward Forbes, but especially when he hired Rutherford John Gettens. We discuss Harvard University's Pigment Collection, plus various analytical tools chemists use to examine art, both light-based and non-light-based. We talk of several institutions with strong chemical applications for art conservation. Finally we examine the problems of modern products--polymers--that need to be preserved, from toys to photographic film.
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Dear Listener,
I have been posting episodes weekly for two and a half years. I need a short break. I promise I will be back very soon. I have many more episodes already written and recorded for you. Please stay tuned. Until then….brave the elements!
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Here we explore the history of unusual and uncommon isotopes of known elements on the periodic table. We discuss the (almost) true statement that all isotopes of an element react the same. Then we reach inside the atomic nucleus and hear of theories to describe nuclear structure and--hence--stability of various isotopes, beginning with Dmitri Ivanenko's work. We learn of the best model, shell structure, and its failings that appeared in the 1980s. Then we talk about half-lives, and how short can a half-life be and still be an atom? How short can a half-live be and still be at least a nucleus? We learn of proton-rich isotopes. Then we hear of the practical value of such research.
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In which I give a brief history of queer chemists. We talk of the rise of queer scientific associations, and the slog to acceptance of the Gay and Transgender Chemists and their Allies in the American Chemical Society, some current queer chemists around the world, and something of the challenge of queer chemists in the Britain.
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Science-fiction writers (and scientists) have been promoting molecular transistors since the 1950s, and we explore the history of why that hasn't happened yet. We start with the parallel sci-fi writer (and biochemist) Isaac Asimov's "molecular valves" and physicist Arthur von Hippel's "molecular engineering." We talk of military projects that failed, and theoretical ideas that take a lot of engineering to make them work.
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In this episode, I have a conversation with Professor David Perlmutter in the Communications Department at Texas Tech University, on the public's impressions of chemistry, and what value chemistry brings to the wider world.
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We start with the first chemical conspiracy theory from 1996, "chemtrails." Then we move to another popular chemical hoax, "alkaline water" somehow being healthy for you. Related to that are the bizarre "hexagonal water" and water memory ideas. Other creative pseudochemical hoaxes are denial of global warming and the gasoline pill, creating fuel from non-fuel with merely a pill in your liquid. There is the fun cryogenically-cooled audio cable hoax (if you are into high-fidelity audio). There was the truly harmful radioactive bed scandal in Korea. Finally I offer some clues to detecting such hoaxes and scams.
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A new material, the MXene, discovered in 2010, is the topic of this episode. We hear of its creation and derivation at Drexel University in Philadelphia. Then we learn of ways to create single layers, variations in materials, and new methods of synthesis of MXenes. Finally, we discuss the practical uses of MXenes.
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We finally get to discuss what the term "aromatic compound" means in chemistry, from Michael Faraday's report in 1825 of a new organic compound (we call it benzene), to von Hofmann's first use in 1856 (without defining it) of the term "aromatic". We examine the ensuing controversies and definitions of "aromatic compound," how people modeled molecularly and diagrammatically what that meant, and current discussions over the word. My Patreon supporters may download a supplemental sheet with molecular structures of some aromatic compounds I mention in the episode.
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Aerogels, those feather-weight materials, have a century-old history. We begin with Samuel Kistler, the inventor of the first aerogels, and move forward through time with loss of interest in them, then revival of interest in the 1970s. We learn about gradual improvements in their fabrication over time. Then we talk of their fascinating properties, and then their uses.
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The podcast currently has 148 episodes available.
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