20 Feb 22:46

Nearly Monodisperse Insulator Cs4PbX6 (X = Cl, Br, I) Nanocrystals, Their Mixed Halide Compositions, and Their Transformation into CsPbX3 Nanocrystals

by Quinten A. Akkerman, Sungwook Park, Eros Radicchi, Francesca Nunzi, Edoardo Mosconi, Filippo De Angelis, Rosaria Brescia, Prachi Rastogi, Mirko Prato and Liberato Manna

TOC Graphic

Nano Letters
DOI: 10.1021/acs.nanolett.6b05262
20 Feb 19:48

21 Utterly Mind-Bottling Facts

19 Feb 06:06

Comic for February 19, 2017

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20 Feb 13:05

Assassination of Kim Jong-nam captured on surveillance video

by Rob Beschizza

Doesn't look like they thought they were pranking him.

(more…)

20 Feb 22:00

Detection of Palladium(I) in Aerobic Oxidation Catalysis

by Jonathan N. Jaworski, Scott D. McCann, Ilia A. Guzei, Shannon S. Stahl

Abstract

Palladium(II)-catalyzed oxidation reactions exhibit broad utility in organic synthesis; however, they often feature high catalyst loading and low turnover numbers relative to non-oxidative cross-coupling reactions. Insights into the fate of the Pd catalyst during turnover could help to address this limitation. Herein, we report the identification and characterization of a dimeric PdI species in two prototypical Pd-catalyzed aerobic oxidation reactions: allylic C−H acetoxylation of terminal alkenes and intramolecular aza-Wacker cyclization. Both reactions employ 4,5-diazafluoren-9-one (DAF) as an ancillary ligand. The dimeric PdI complex, [PdI(μ-DAF)(OAc)]2, which features two bridging DAF ligands and two terminal acetate ligands, has been characterized by several spectroscopic methods, as well as single-crystal X-ray crystallography. The origin of this PdI complex and its implications for catalytic reactivity are discussed.

Thumbnail image of graphical abstract

Catalyst entanglement: Catalyst dimerization is observed in both the aerobic palladium-catalyzed allylic C−H acetoxylation and aza-Wacker cyclization. A novel PdI species is rigorously characterized in catalysis which has implications for palladium catalyst design and presents insights into catalyst deactivation.

20 Feb 08:33

Comic: 2017-02-20

New Comic: 2017-02-20
20 Feb 04:00

Hoofin' It

If I'm on my Ride Pokemon and a wild Pokemon jumps out in front of me, I think it's only fair that they start the battle already severely brutalized by angry hooves.
20 Feb 16:30

Ctrl+Alt+Del: Console War, p53

by tim@cad-comic.com (Tim Buckley)
20 Feb 06:11

SSSS page 679

Page 679 is up!
20 Feb 07:27

Girls With Slingshots - GWS Chaser #510

by tech@thehiveworks.com
New comic!
Today's News:

Lesbianism seemed like it had a pretty stringent entry fee to me when I was in my twenties.

http://www.girlswithslingshots.com//comic/gws510">Here's the old strip!

21 Feb 11:12

Physical Organic Approach to Persistent, Cyclable, Low-Potential Electrolytes for Flow Battery Applications

by Christo S. Sevov, David P. Hickey, Monique E. Cook, Sophia G. Robinson, Shoshanna Barnett, Shelley D. Minteer, Matthew S. Sigman and Melanie S. Sanford

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.7b00147
20 Feb 10:20

1063

by Lar

The post 1063 appeared first on Looking For Group.

20 Feb 19:41

α-Imino Gold Carbenes from 1,2,4-Oxadiazoles: Atom-Economical Access to Fully Substituted 4-Aminoimidazoles

by Zhongyi Zeng, Hongming Jin, Jin Xie, Bing Tian, Matthias Rudolph, Frank Rominger and A. Stephen K. Hashmi

TOC Graphic

Organic Letters
DOI: 10.1021/acs.orglett.7b00001
21 Feb 16:21

Where Do You Live?

by Megan Cahn

My friends are dropping like flies…

Every few months, another one sits us down and breaks the news. He or she is leaving New York. They got a new job, their partner got a job, they want to be closer to their parents, they’re sick of the cold winters, they want more space, the rent is just too high (basically this).… Read more

The post Where Do You Live? appeared first on A Cup of Jo.

19 Feb 17:56

Don’t walk upside down in the middle of the street, y’all.

by thebloggess
So, I came across this sign yesterday: …and I couldn’t decide if it meant “don’t walk upside down” or “don’t stand on your head in this particular intersection” but I suspect it most likely means “Don’t hang signs while drunk”.  All … Continue reading →
20 Feb 13:51

Atomic Modulation of FeCo–Nitrogen–Carbon Bifunctional Oxygen Electrodes for Rechargeable and Flexible All-Solid-State Zinc–Air Battery

by Chang-Yuan Su, Hui Cheng, Wei Li, Zhao-Qing Liu, Nan Li, Zhufeng Hou, Fu-Quan Bai, Hong-Xing Zhang, Tian-Yi Ma

Rational design and exploration of robust and low-cost bifunctional oxygen reduction/evolution electrocatalysts are greatly desired for metal–air batteries. Herein, a novel high-performance oxygen electrode catalyst is developed based on bimetal FeCo nanoparticles encapsulated in in situ grown nitrogen-doped graphitic carbon nanotubes with bamboo-like structure. The obtained catalyst exhibits a positive half-wave potential of 0.92 V (vs the reversible hydrogen electrode, RHE) for oxygen reduction reaction, and a low operating potential of 1.73 V to achieve a 10 mA cm−2 current density for oxygen evolution reaction. The reversible oxygen electrode index is 0.81 V, surpassing that of most highly active bifunctional catalysts reported to date. By combining experimental and simulation studies, a strong synergetic coupling between FeCo alloy and N-doped carbon nanotubes is proposed in producing a favorable local coordination environment and electronic structure, which affords the pyridinic N-rich catalyst surface promoting the reversible oxygen reactions. Impressively, the assembled zinc–air batteries using liquid electrolytes and the all-solid-state batteries with the synthesized bifunctional catalyst as the air electrode demonstrate superior charging–discharging performance, long lifetime, and high flexibility, holding great potential in practical implementation of new-generation powerful rechargeable batteries with portable or even wearable characteristic.

Thumbnail image of graphical abstract

Bamboo-like FeCo alloy encapsulated in nitrogen-doped carbon nanotubes exhibits superior catalytic oxygen reduction and oxygen evolution performance than that of noble metal benchmarks, which benefits from the nitrogen-rich and defect-rich catalyst surface. The all-solid-state zinc–air batteries equipped by the synthesized materials show low charging/discharging overpotentials, long lifetime, and high flexibility, suitable for practical application.

21 Feb 06:55

Planning

20 Feb 06:03

Comic for February 20, 2017

Dilbert readers - Please visit Dilbert.com to read this feature. Due to changes with our feeds, we are now making this RSS feed a link to Dilbert.com.
20 Feb 21:43

Cat attempts to steal a treat tossed to dog, regrets decision quickly

by Xeni Jardin

Miscalculation.

(more…)

20 Feb 22:00

Understanding of Strain Effect in Electrochemical Reduction of CO2: Using Pd Nanostructures as an Ideal Platform

by Hongwen Huang, Huanhuan Jia, Zhao Liu, Pengfei Gao, Jiangtao Zhao, Zhenlin Luo, Jinlong Yang, Jie Zeng

Abstract

Tuning the surface strain of heterogeneous catalysts represents a powerful strategy to engineer their catalytic properties by altering the electronic structures. However, a clear and systematic understanding of strain effect in electrochemical reduction of carbon dioxide is still lacking, which restricts the use of surface strain as a tool to optimize the performance of electrocatalysts. Herein, we demonstrate the strain effect in electrochemical reduction of CO2 by using Pd octahedra and icosahedra with similar sizes as a well-defined platform. The Pd icosahedra/C catalyst shows a maximum Faradaic efficiency for CO production of 91.1 % at −0.8 V versus reversible hydrogen electrode (vs. RHE), 1.7-fold higher than the maximum Faradaic efficiency of Pd octahedra/C catalyst at −0.7 V (vs. RHE). The combination of molecular dynamic simulations and density functional theory calculations reveals that the tensile strain on the surface of icosahedra boosts the catalytic activity by shifting up the d-band center and thus strengthening the adsorption of key intermediate COOH*. This strain effect was further verified directly by the surface valence-band photoemission spectra and electrochemical analysis.

Thumbnail image of graphical abstract

No strain, no gain: Pd octahedra and icosahedra with similar sizes are used as a well-defined platform to study the effect of surface strain in electrochemical reduction of CO2. The results show that tensile strain improves catalytic activity by shifting up the d-band center and thus strengthening the adsorption of key intermediate COOH*.

20 Feb 17:12

Comic: A Big, Big Love

by Tycho@penny-arcade.com (Tycho)
New Comic: A Big, Big Love
20 Feb 17:02

Why You Can Eat Raw Fish But Not Other Raw Meats

by Kristin Wong

Raw fish is pretty tasty if you like sushi, but eating other raw meats is a terrible idea. The parasites and bacteria in some raw meat, like pork or chicken, are a lot more dangerous than the bacteria in fish. SciShow breaks it down.

Read more...

20 Feb 17:14

How the BBC made Planet Earth II

by Jason Kottke

In the first of a three-part video series, Vox’s Joss Fong looks at how the technology used to film nature documentaries has changed over the past 50 years and how the producers of Planet Earth II used contemporary image stabilization techniques to make the series with a more cinematic style.

In the 1970s and ’80s, it was enough for the NHU to show people a creature they’d never seen before and provide the details in the narration. The films were illustrated zoology lectures. Since then, the producers have become sticklers for capturing specific behaviors, and in Planet Earth II, they showcase the drama of those behaviors. Each scene sets up the characters to perform something - something brave, something brutal, something bizarre. They’ve made room for our emotions; that’s what cinematic storytelling means.

And visually, the cinematic approach means the camera is often moving.

Hollywood filmmakers have kept the camera in motion for decades, but for obvious reasons, it’s much more difficult when your subject is wildlife. As we explain in the video at the top of this post, NHU producers used new stabilization tools throughout the production of Planet Earth II to move the camera alongside the animals.

The program doesn’t make you wait long to showcase this new approach. The tracking shot of a lemur jumping from tree to tree is one of the first things you see in the first episode and it put my jaw right on the floor. It’s so close and fluid, how did they do that? Going into the series, I thought it was going to be more of the same — Planet Earth but with new stories, different animals, etc. — but this is really some next-level shit. The kids were more excited after watching it than any movie they’ve seen in the past 6 months (aside from possibly Rogue One). The Blu-ray will be out at the end of March1 but there’s also a 4K “ultra HD” version that had me researching new ultra HD TVs I don’t really need.

Oh, and remember that thrilling sequence of the snakes chasing the newly hatched iguanas? Here’s a short clip on how they filmed it.

  1. I still have a Blu-ray player than I barely use and only buy 1-2 BR discs a year, but Planet Earth II is one of those increasingly rare programs you want to see in full HD without compression or streaming artifacts.

Tags: Joss Fong   movies   Planet Earth   TV   video
20 Feb 19:03

A Video Guide to Help You Find the Perfect Fitting Dress Shirt Every Time

by Stephanie Lee

You could buy the most expensive and nicest looking dress shirt at the store, but if it doesn’t fit right it just looks wrong. This video shows you how to buy dress shirts that look great on you every time.

Read more...

21 Feb 06:59

Comic for February 21, 2017

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