Tag: chemistry

Movies and Chemistry: Keeping the Enchantment of Education

Several movies give you an “enchanting” back door or window into chemistry so that you can “beat” the tediousness of regular education and come into the field and its topics via these movies:

I.

The Man in the White Suit is a 1951 British comedy classic with Alec Guinness as a genius research chemist. He fiddles with his flasks and polymer and textile chemistry experiments until he invents a fabric that shows no wear and tear “forever.” This would seem like a great boon to humanity in its clothing needs but the chemist (“Sidney Stratton”) finds that both labor and management reject his discovery violently as it threatens jobs and profits. Textile or fabric polymer chemistry is at the heart of the plot.

Cry Terror! is a taut 1958 crime thriller movie with James Mason and Rod Steiger. The plot involves the terrorist threat of exploding a domestic airliner with a hidden RDX cache (a TNT successor) unless the demanded payment is made.

RDX was used by both sides in World War II. The U.S. produced about 15,000 long tons per month during WWII and Germany about 7,000 long tons per month. RDX had the major advantages of possessing greater explosive force than TNT, used in World War I and requiring no additional raw materials for its manufacture.

Semtex is a general-purpose plastic explosive containing RDX and PETN. It is used in commercial blasting, demolition, and in certain military applications.

A Semtex bomb was used in the Pan Am Flight 103 (known also as the Lockerbie) bombing in 1988. A belt laden with 700 g (1.5 lb) of RDX explosives tucked under the dress of the assassin was used in the assassination of former Indian prime minister Rajiv Gandhi in 1991.

The 1993 Bombay bombings used RDX placed into several vehicles as bombs. RDX was the main component used for the 2006 Mumbai train bombings and the Jaipur bombings in 2008. It also is believed to be the explosive used in the 2010 Moscow Metro bombings.

Traces of RDX were found on pieces of wreckage from 1999 Russian apartment bombings and 2004 Russian aircraft bombings. Further reports on the bombs used in the 1999 apartment bombings indicated that while RDX was not a part of the main charge, each bomb contained plastic explosive used as a booster charge.

Ahmed Ressam, the al-Qaeda Millennium Bomber, used a small quantity of RDX as one of the components in the bomb that he prepared to detonate in Los Angeles International Airport on New Year’s Eve 1999-2000; the bomb could have produced a blast forty times greater than that of a devastating car bomb.

In July 2012, the Kenyan government arrested two Iranian nationals and charged them with illegal possession of 15 kilograms (33 pounds) of RDX. According to the Kenyan Police, the Iranians planned to use the RDX for “attacks on Israeli, U.S., UK and Saudi Arabian targets.”

RDX was used in the assassination of Lebanese Prime Minister Rafic Hariri on February 14, 2005.

In the 2019 Pulwama attack in India, 250 kg of high-grade RDX was used by Jaish-e-Mohammed. The attack resulted in the deaths of 44 Central Reserve Police Force personnel as well as the attacker.

Semtex was developed and manufactured in Czechoslovakia, originally under the name B 1 and then under the “Semtex” designation since 1964, labeled as SEMTEX 1A, since 1967 as SEMTEX H, and since 1987 as SEMTEX 10. Originally developed for Czechoslovak military use and export, Semtex eventually became popular with paramilitary groups and rebels or terrorists because prior to 2000 it was extremely difficult to detect, as in the case of Pan Am Flight 103.

The Russian apartment bombings were a series of explosions that hit four apartment blocks in the Russian cities of Buynaksk, Moscow and Volgodonsk in September 1999, killing more than 300, injuring more than 1,000, and spreading fear across the country. The bombings, together with the Invasion of Dagestan, triggered the Second Chechen War. The handling of the crisis by Vladimir Putin, who was prime minister at the time, boosted his popularity greatly and helped him attain the presidency within a few months.

The blasts hit Buynaksk on 4 September and in Moscow on 9 and 13 September. On 13 September, Russian Duma speaker Gennadiy Seleznyov made an announcement in the Duma about receiving a report that another bombing had just happened in the city of Volgodonsk. A bombing did indeed happen in Volgodonsk, but only three days later, on 16 September. Chechen militants were blamed for the bombings, but denied responsibility, along with Chechen president Aslan Maskhadov.

A suspicious device resembling those used in the bombings was found and defused in an apartment block in the Russian city of Ryazan on 22 September. On 23 September, Vladimir Putin praised the vigilance of the inhabitants of Ryazan and ordered the air bombing of Grozny, which marked the beginning of the Second Chechen War. Three FSB agents who had planted the devices at Ryazan were arrested by the local police, with the devices containing a sugar-like substance resembling RDX.

II.

The movie Khartoum (1966) has General Charles Gordon traveling to Sudan in 1884 to quell the “mad mullah” the Mahdi. (Osama bin Laden of his day).
At the train station where General Gordon starts his trip, there’s a railway ad sign that promotes the use of “Wright’s Coal Tar Soap.”

This gives us a sign of the rise of the modern chemical industry.

III.

Think of “Sherlock Holmes” in terms of all the movies and TV series or the original stories and books:

Holmes has to explain to Watson how he survived the assassination attempt on him by Moriarty, “the Napoleon of Crime” who threw him off the Reichenbach Falls. Holmes explains that he faked Moriarty out and clung to a bush or something and was (obviously) not killed.

Holmes tells Watson what he does when he returns to civilization and travels and studies for some three years:

“I then passed through Persia, looking in at Mecca, and paid a short but interesting visit to the Khalifa at Khartoum, the results of which I communicated to the Foreign Office. Returning to France, I spent some months in a research into the coal-tar derivatives, which I conducted in a laboratory at Montpellier, in the south of France.”

The context implies the year 1894.

There is clear evidence that Mr. Holmes was deeply involved in the research of coal-tar derivatives as early as 1889 when the events of the Copper Beeches matter were transpiring.

We are told that on an evening in 1889, Mr. Holmes was seated in 221B Baker Street at the deal table loaded with retorts and test tubes. He was settling down to one of those all-night chemical researches in which he frequently indulged.

The research work was interrupted by a message of distress from Violet Hunter. Watson found that there was a train the next morning, and Holmes tells Watson:

“That will do very nicely. Then perhaps I had better postpone my analysis of the acetones as we may need to be at our best in the morning.”

It is clear that Holmes was engaged in coal-tar research long before his visit to Montpellier in the south of France.

The quotation from the Copper Beeches story refers to acetones, not to coal-tar derivatives.

“In the fractional distillation of coal-tar, the distillate separates into five distinct groups or layers, depending upon the stage of the process and the amount of heat applied. Category-one of the five includes benzene, toluene, xylenes and cumenes.

Acetones [dimethelketone-CH3COCH3] may be derived from the oxidation of cumene. And cumene [isopropylbenzene-C6H5C(CH3)2] is derived by distillation from the coal-tar naphtha fractions.”

Cumenes are derived from coal-tar, and acetones are derived from cumenes. Thus, a study of the acetones is, necessarily, research into coal-tar derivatives.

The rise of chemical engineering and organic chemistry are at the heart of the Sherlock Holmes stories.

Thus we can “climb” into chemistry via these books and movies and keep a feeling of enchantment as a kind of educational “shoehorn.”

Education: Holding On to the Adventure Part of It

Education must hold on to learning-as-adventure or it goes stale.

Here’s a real example:

A man goes to his American Heritage Dictionary, to look up the word “vinaigrette” which he seems to remember as a salad dressing but finds there are as so often happens, other meanings.

The man’s eye looks down and comes across medicinal words close by like “vinblastine” and “vincristine” which have anti-tumor properties and are used in cancer medicine.

If you read the dictionary definitions receptively and thoughtfully you enter a world of tremendous complexity and interest (e.g., alkaloids, plant chemistry, phytochemistry, medicine, etc.). The Madagascar periwinkle plant is mentioned as a source for these alkaloids that become anti-neoplastic drugs. You wonder: why Madagascar? Why periwinkle plants? Why plants? These questions have “nontrivial” answers.

You also wonder about the nature of alkaloids and whether there are some evolutionary reasons why some plants produce food, some poisons (poison ivy, say), and others “good poisons” (i.e., alkaloids that can be made therapeutic through pharmacology).

You perhaps remember the PBS program of years ago about the black genius who did deep work in these and other “phytochemical” fields:

Percy Lavon Julian (April 11, 1899 – April 19, 1975) was a research chemist and a pioneer in the chemical synthesis of medicinal drugs from plants. He later started his own company to synthesize steroid intermediates from the wild Mexican yam. Julian received more than 130 chemical patents.

You can be dismissive and dismiss this “spontaneous questing” as a kind of woolgathering or “lolling about” mentally but the truth is often the opposite: it is only such “productive daydreams” that allow you to penetrate fields and topics and questions and problems by finding a “surprise window” or “backdoor” into them. Serendipity is very related to education, which has both formal or “do your homework” components to it and also a “wander about” one when you’re quite relaxed and mentally receptive.

Going from your “vinaigrette” definition quest, where you started, to wandering off into a deep look at vinblastine, vincristine, cancer, alkaloids and phytochemicals opens up “worlds” to you which is of course at the very basis of real education.

New Ultrathin Capacitor Could Enable Energy-Efficient Microchips

Scientists turn century-old material into a thin film for next-gen memory and logic devices

[from Berkeley Lab, by Rachel Berkowitz]

Electron microscope images show the precise atom-by-atom structure of a barium titanate (BaTiO3) thin film sandwiched between layers of strontium ruthenate (SrRuO3) metal to make a tiny capacitor. (Credit: Lane Martin/Berkeley Lab)

The silicon-based computer chips that power our modern devices require vast amounts of energy to operate. Despite ever-improving computing efficiency, information technology is projected to consume around 25% of all primary energy produced by 2030. Researchers in the microelectronics and materials sciences communities are seeking ways to sustainably manage the global need for computing power.

The holy grail for reducing this digital demand is to develop microelectronics that operate at much lower voltages, which would require less energy and is a primary goal of efforts to move beyond today’s state-of-the-art CMOS (complementary metal–oxide semiconductor) devices.

Non-silicon materials with enticing properties for memory and logic devices exist; but their common bulk form still requires large voltages to manipulate, making them incompatible with modern electronics. Designing thin-film alternatives that not only perform well at low operating voltages but can also be packed into microelectronic devices remains a challenge.

Now, a team of researchers at Lawrence Berkeley National Laboratory (Berkeley Lab) and UC Berkeley have identified one energy-efficient route—by synthesizing a thin-layer version of a well-known material whose properties are exactly what’s needed for next-generation devices.

First discovered more than 80 years ago, barium titanate (BaTiO3) found use in various capacitors for electronic circuits, ultrasonic generators, transducers, and even sonar.

Crystals of the material respond quickly to a small electric field, flip-flopping the orientation of the charged atoms that make up the material in a reversible but permanent manner even if the applied field is removed. This provides a way to switch between the proverbial “0” and “1” states in logic and memory storage devices—but still requires voltages larger than 1,000 millivolts (mV) for doing so.

Seeking to harness these properties for use in microchips, the Berkeley Lab-led team developed a pathway for creating films of BaTiO3 just 25 nanometers thin—less than a thousandth of a human hair’s width—whose orientation of charged atoms, or polarization, switches as quickly and efficiently as in the bulk version.

“We’ve known about BaTiO3 for the better part of a century and we’ve known how to make thin films of this material for over 40 years. But until now, nobody could make a film that could get close to the structure or performance that could be achieved in bulk,” said Lane Martin, a faculty scientist in the Materials Sciences Division (MSD) at Berkeley Lab and professor of materials science and engineering at UC Berkeley who led the work.

Historically, synthesis attempts have resulted in films that contain higher concentrations of “defects”—points where the structure differs from an idealized version of the material—as compared to bulk versions. Such a high concentration of defects negatively impacts the performance of thin films. Martin and colleagues developed an approach to growing the films that limits those defects. The findings were published in the journal Nature Materials.

To understand what it takes to produce the best, low-defect BaTiO3 thin films, the researchers turned to a process called pulsed-laser deposition. Firing a powerful beam of an ultraviolet laser light onto a ceramic target of BaTiO3 causes the material to transform into a plasma, which then transmits atoms from the target onto a surface to grow the film. “It’s a versatile tool where we can tweak a lot of knobs in the film’s growth and see which are most important for controlling the properties,” said Martin.

Martin and his colleagues showed that their method could achieve precise control over the deposited film’s structure, chemistry, thickness, and interfaces with metal electrodes. By chopping each deposited sample in half and looking at its structure atom by atom using tools at the National Center for Electron Microscopy at Berkeley Lab’s Molecular Foundry, the researchers revealed a version that precisely mimicked an extremely thin slice of the bulk.

“It’s fun to think that we can take these classic materials that we thought we knew everything about, and flip them on their head with new approaches to making and characterizing them,” said Martin.

Finally, by placing a film of BaTiO3 in between two metal layers, Martin and his team created tiny capacitors—the electronic components that rapidly store and release energy in a circuit. Applying voltages of 100 mV or less and measuring the current that emerges showed that the film’s polarization switched within two billionths of a second and could potentially be faster—competitive with what it takes for today’s computers to access memory or perform calculations.

The work follows the bigger goal of creating materials with small switching voltages, and examining how interfaces with the metal components necessary for devices impact such materials. “This is a good early victory in our pursuit of low-power electronics that go beyond what is possible with silicon-based electronics today,” said Martin.

“Unlike our new devices, the capacitors used in chips today don’t hold their data unless you keep applying a voltage,” said Martin. And current technologies generally work at 500 to 600 mV, while a thin film version could work at 50 to 100 mV or less. Together, these measurements demonstrate a successful optimization of voltage and polarization robustness—which tend to be a trade-off, especially in thin materials.

Next, the team plans to shrink the material down even thinner to make it compatible with real devices in computers and study how it behaves at those tiny dimensions. At the same time, they will work with collaborators at companies such as Intel Corp. to test the feasibility in first-generation electronic devices. “If you could make each logic operation in a computer a million times more efficient, think how much energy you save. That’s why we’re doing this,” said Martin.

This research was supported by the U.S. Department of Energy (DOE) Office of Science. The Molecular Foundry is a DOE Office of Science user facility at Berkeley Lab.

Education and Word and Number Hidden Vagueness

These mini-essays help students of any age to re-understand education in a deeper and more connected way.

They look for “circum-spective” intelligence. (Not in the sense of prudential or cautious but in the sense of “around-looking.”)

One of the things to begin to see is that explaining things in schools is misleading “ab initio” (i.e., from the beginning).

Let’s do an example:

In basic algebra, you’re asked: what happens to (x2 – 1)/(x – 1) as x “goes to” (i.e., becomes) 1.

If you look at the numerator (thing on top), x2 is also 1 (since 1 times 1 is 1) and (1 – 1) is zero. The denominator is also (1 – 1) and zero.

Thus you get 0 divided by 0.

You’re then told that’s a no-no and that’s because zeros and infinities lead to all kinds of arithmetic “bad behavior” or singularities.

You’re then supposed to see that x2 – 1 can be re-written as (x – 1)(x + 1) and since “like cancels like,” you cancel the x – 1 is the numerator and denominator and “get rid” of it.

This leaves simply x + 1. So, as x goes to 1, x + 1 goes to 2 and you have a “legitimate” answer and have bypassed the impasse of 0 acting badly (i.e., zero divided by zero).

If you re-understand all this more slowly you’ll see that there are endless potential confusions:

For example: you cannot say that (x2 – 1)/(x – 1) = x + 1 since looking at the two sides of the equal sign shows different expressions which are not equal.

They’re also not really equivalent.

You could say that coming up with x + 1 is a workaround or a “reduced form” or a “downstream rewrite” of (x2 – 1)/(x – 1).

This reminds us of the endless confusions in high school science: if you combine hydrogen gas (H2) with oxygen gas (O2) you don’t get water (H2O). Water is the result of a chemical reaction giving you a compound.

A mixture is not a compound. Chemistry is based on this distinction.

Math and science for that matter, are based on taking a formula or expression (like the one we saw above) and “de-cluttering” it or “shaking loose” a variant form which is not identical and not the same but functionally equivalent in a restricted way.

A lot of students who fail to follow high school or college science sense these and other “language and number” problems of hidden vagueness.
School courses punish students who “muse” to themselves about hidden vagueness. This behavior is pre-defined as “bad woolgathering” but we turn this upside down and claim it is potentially “good woolgathering” and might lead to enchantment which then underlies progress in getting past one’s fear of something like math or science or anything else.

One is surrounded by this layer of reality on all sides, what Wittgenstein calls “philosophy problems which are really language games.”

Think of daily life: you say to someone: “you can count one me.” You mean trust, rely on, depend on, where count on is a “set phrase.” (The origin of the phrase and how it became a set phrase is probably unknowable and lost in the mists of time.)

“You can count on me” does not mean you can stand on me and then count something…one, two, three.

In other words in all kinds of language (English, say, or math as a language) one is constantly “skating over” such logic-and-nuance-and-meaning issues.

The genius Kurt Gödel (Einstein’s walk around buddy at Princeton) saw this in a deep way and said that it’s deeply surprising that languages work at all (spoken, written or mathematical) since the bilateral sharing of these ambiguities would seem deadly to any clarity at all and communication itself would seem a rather unlikely outcome.

You could also say that drama giants of the twentieth century like Pinter, Ionesco and Beckett, intuit these difficulties which then underlie their plays.

All of this together gives you a more “composite” “circum-spective” view of what is really happening in knowledge acquisition.

Essay 51: “The Whole:” a Quick Second Look

We started this book with a quote from Wittgenstein “Light dawns gradually over the whole” and argued that the meaning of the “whole” is and will be elusive forever.

That is as it should be:

Think of the final pages of John Dewey’s classic book, The Quest for Certainty.  You’ll sense how Dewey oscillates between the “pin-down-ability” of the “whole” and its eternal slipperiness:

“Diversification of discoveries and the opening up of new points of view and new methods are inherent in the progress of knowledge.  This fact defeats the idea of any complete synthesis of knowledge upon an intellectual basis.  The sheer increase of specialized knowledge will never work the miracle of producing an intellectual whole.  The astronomer, biologist, chemist, may attain systematic wholes, at least for a time, within his whole field.

“Man has never had such a varied body of knowledge in his possession before, and probably never before has he been so uncertain and so perplexed as to what his knowledge means, what it points to in action and in consequences.”

(Dewey, The Quest for Certainty, Capricorn Books, 1960, pages 312/313)

Wholeness, Dewey senses, like the white whale in Moby-Dick, “won’t sit for a portrait.”   That is why the student should take an eternally “non-rigid” answer to these questions which are “arguments without end” and that’s fine.

Essay 36: What We Mean by “Epochal Waters”

We sometimes use the phrase “epochal waters” to refer to the deepest layers of the past which we “swimmers” at the surface of the ocean don’t see or know. “Epochal waters” are latent, currents are closer to the surface.

There’s a similar idea from the French philosopher Michel Foucault who died in 1984. In his The Order of Things, classic from 1966, he talks about the “episteme” (as in epistemology) that frames everything from deep down. (The Greeks distinguished between “techne” (arts, crafts, practical skills and “episteme” (theory, overview).

“In essence, Les mots et les choses (Foucault’s The Order of Things) maintains that every period is characterized by an underground configuration that delineates its culture, a grid of knowledge making possible every scientific discourse, every production of statements. Foucault designates this historical a priori as an episteme, deeply basic to defining and limiting what any period can—or cannot—think.

Each science develops within the framework of an episteme, and therefore is linked in part with other sciences contemporary with it.

(Didier Eribon, Michel Foucault, Harvard University Press,  1991, page 158)

Take a simple example. A discussion comes up about what man is or does or thinks or knows. In today’s episteme or pre-definition, one thinks immediately not of man in terms of language or the invention of gods, but in terms of computational genomics, big data, bipedalism (walking upright on two legs). Its assumed in advance via an invisible episteme, that science and technology. physics, genetics, big data, chemistry and biology hold the answer and the rest is sort of outdated. This feeling is automatic and reflexive like breathing and might be called “mental breathing.”

One’s thoughts are immediately sent in certain directions or grooves, a process  that is automatic and more like a “mental reflex” than a freely chosen “analytical frame.” The thinker has been “trained” in advance and the episteme pre-decides what is thinkable and what is not.

There are deep episteme that underlie all analyses: for example, in the Anglo-American tradition of looking at things, the phrase “human nature” inevitably comes in as a deus ex machina (i.e., sudden way of clinching an argument, the “magic factor” that has been there all along). If you ask why are you suddenly “importing” the concept of “human nature,” the person who uses the phrase has no idea. It’s in the “epochal water” or Foucault’s episteme, and it suddenly swims up from below at the sea floor.

Another quick example: In the Anglo-American mind, there’s a belief from “way down and far away” that failure in life is mostly about individual behavior (laziness, alcoholism, etc.) and personal “stances” while “circum-stances” are an excuse. This way of sequencing acceptable explanations is deeply pre-established in a way that is itself hard to explain. It serves to “frame the picture” in advance. These are all “epochal water“ or episteme phenomena.