#Mechanochemistry

[materialsscienceandengineering]

Mechanochemical synthesis: New theory explains reaction rate acceleration

In contrast to conventional organic synthesis, mechanochemistry does not use solvents that eventually become industrial wastes. Thus, mechanochemistry is environmentally friendly and enables us to perform organic synthesis using reactants that poorly dissolve into common solvents. As solvents are not used, reactants used for organic synthesis are often in the solid state. Previous experimental studies have suggested that the force applied by the ball to the system accelerates the chemical reaction, but it is not well understood how macroscopic forces influence chemical reactions on the molecular scale. Compared to conventional methods for organic synthesis, the theoretical foundation of mechanochemical organic synthesis is still in its infancy. A deeper understanding of reaction kinetics within mechanochemical reactions will be crucial for advancing the field towards becoming a conventional strategy itself.

Read more.

[sunset-sunbun]

art dump of the Connor's (plus zinkop)

Liam is Ted's brother, and senth is teddy's son. infodump time- Liam and Ted are opposites; Liam is very aloof and apathetic towards most people and nearly all his relationships are transactional. whereas Ted actually cares about people, like a normal person, and is outwordly very friendly and extroverted and kind. which is why he is nicknamed and goes by teddy ::] (Liam takes it the extra mile to piss him off though, and calls him "T". you don't like how long your name is, don't worry I got it. *uses a singular letter*) Now; senth has ADHD and takes a special interest in robotics for a while before it moves onto chemistry- but still goes to college with the intent of Mechanochemistry being his field ::] that is before he died due to demigod fuckery. Levi Tell; one of AAC's demigods, is a ghost who needs a physical anchor to keep him in the mortal plane. during a time when Liam was heavily deteriorated he just latched onto the closest person, that was unfortunately senth. since it was unconsentual and unprepared, it shattered his body and physical makeup entirely.. and he became a soul. while it anchored levi enough to find justin- it was really unfortunate for senth as he "disappeared without a trace" (he's just sort of a soul with kayko that hangs around levi now since he doesn't have a choice. but like. he goes on cool adventures and sees other dimensions so that's fun at least) Teddy suspects Liam killed him but Liam insists he didn't. and he isn't lying (he just killed different people is all- lmao) this mystery is never solved and just sits with the three (liam teddy and Anne [ted's wife]) until the apocalypse.

[3acesnews]

Mechanochemistry Might Help Us Achieve “Impossible” Reactions

[qingzinano]

Russian Scientists Have Found That A Nanometer Mask With Antibacterial Properties May Help Protect Against The New Coronavirus Qingzi Nano Can Provide Up To 99.99% Antibacterial Filter Membrane

 #nanometer #mask #antibacterial #filter #membrane #nanosilver #polypropylene #microfibers #micrometer #nanofiber #electrospinning #technology #nanomembrane #nanofibers #equipment #technical #solutions #nanofilament #processing #services #materials #silver #nanoparticles

 Russian scientists have discovered a material that can kill the flu virus, in the hope that it will protect against coronaviruses. Russian scientists have discovered a new material that can kill the flu virus, and they hope it could be used to make face masks to help protect people against both the flu virus and the new coronavirus.Scientists hope a material they claim kills bacteria and viruses could be used to make masks to help combat the new coronavirus.The main ingredient of this material is nano-silver with antibacterial properties, which is prepared by using a melt-blown process. Alexander Zanovic Medvedev, who worked on the project, explains that the process can be used to make polypropylene microfibers one micrometer in diameter. Medvedev is currently in charge of a laboratory at the Siberian branch of the Russian academy of sciences. It is unclear whether the study has been published in a peer-reviewed journal. In a statement, Mr. Medvedev said he and his colleagues put the material inside a conventional three-ply surgical mask.The researchers tested the mask against influenza a viruses as well as staphylococcus and e. coli, said Nikolai Zakharovic Lyakhov, principal researcher at the institute of chemistry and technology. When the team compared the new material to a regular mask, the number of viruses penetrating the mask was 10,000 times higher. "Our material kills and completely suppresses the virus," Lyakhov said. However, he added that the mechanism of how the material works was not fully understood and would have to be studied in other research projects.The team believes the material could protect people from swine flu for up to 10 hours, compared with regular masks that need to be replaced every hour or two.The new mask will be reusable but will be more expensive than conventional masks, according to a press release issued by the institute of solid state chemistry and mechanochemistry of the Siberian branch of the Russian academy of sciences.

Lyakhov said he spoke with infectious disease experts. Since the masks kill the virus, "other viruses that are likely to cause respiratory infections are likely to be affected in the same way," the experts said.

Qingzi Nano nanofiber antibacterial filter membrane

 Qingzi Nano self-developed nano-fiber antibacterial filter membrane, using advanced electrospinning nano-fiber technology, nano-membrane diameter of about 100~500nm, compared with the melt spray process produced by the fiber diameter is smaller, better antibacterial performance. Compared with the conventional use of silver as an antibacterial material, the Qingzi Nano team has overcome the yellow problem. The nano-fiber antibacterial filter membrane is used as the lining of the mask, effectively blocking and filtering dust, PM2.5 particles, filtering up to 99.99%, effectively inhibiting more than 650 kinds of bacteria and viruses such as influenza virus, MERS, SARS bacteria.

 Nanofibers

 Due to the characteristics of small diameter, small void volume and small pore size, nanofibers can be widely used in the field of air filtration, which can filter viruses, bacteria, fine particles and other micro substances, and significantly improve the filtration efficiency of air filters.

 Nanofiber equipment and technical solutions

In order to cope with the epidemic, our company actively organized the resumption of work and provided:

◆Nanofiber processing services;

◆Electrostatic electret processing service.

 To assist medical and health materials processing enterprises to improve product performance and provide functional layer of nano-fiber, to resist bacterial invasion.

In view of the epidemic situation, our company developed: high efficiency and low resistance filter material and antibacterial filter material;The above two types can be used as core filter material or antibacterial functional layer:

◆Combined with PP, PET, electrostatic cotton and other filter materials to improve filtration efficiency;

◆It can also be used as a filtration/functional layer alone to achieve filtration or antibacterial functions;

◆Nanofilament was used to realize physical filtration, and the filtration persistence was increased 5 times;

◆Can inhibit common bacteria (staphylococcus aureus, escherichia coli, pneumoniae, etc.), antibacterial efficiency > 98%;

◆Solve the yellowing problem, durable and beautiful (our own intellectual property technology).

In response to this outbreak, our company actively cooperated with non-woven raw materials and finished products processing enterprises to provide customers with nano-fiber processing services. The materials are widely used in masks, protective clothing and other medical and health supplies.

Our nano-fiber materials can be widely used in household and industrial air filtration products, vehicle filters, water filtration, sanitary products and other filtration and antibacterial fields.

Looking forward to working with more colleagues from all walks of life to get rid of the new coronavirus as soon as possible!

Link to report: Russian scientists find silver nanoparticles mask may help protect against new coronavirus

https://mp.weixin.qq.com/s/kmSOcgc70NB8kHlW_1bn5w

 Contact｜86-757-89956077

E-mail｜info@qingzitech.com

Foshan Lepton Precision M&C Tech Co.,Ltd

www.qingzitech.com

www.qingzitech.net

[vgtrust]

Carter triplety

CARTER TRIPLETY UPDATE

Elina Ploshnik, David Danovich, Philippe C.Journal of the American Chemical Society 2011, 133 A Cyclic Disilylated Stannylene: Synthesis, Dimerization, and Adduct Formation. Henning Arp, Judith Baumgartner, Christoph Marschner, and Thomas Müller.The Journal of Physical Chemistry C 2011, 115 Bond Energies in Models of the Schrock Metathesis Catalyst. Monica Vasiliu, Shenggang Li, Anthony J.A New Target for Synthesis of Triply Bonded Plumbacetylene (RC≡PbR): A Theoretical Design. The Journal of Physical Chemistry A 2011, 115 New Generation of Dialkylsilylenes with Stabilities Comparable to Diaminosilylenes: A Theoretical Study. Room-Temperature Dissociation of 1,2-Dibromodisilenes to Bromosilylenes. Katsunori Suzuki, Tsukasa Matsuo, Daisuke Hashizume, and Kohei Tamao.Thermochemical Properties of Selenium Fluorides, Oxides, and Oxofluorides. Computational Investigation of Brook-Type Silabenzenes and Their Possible Formation through -Si→O Silyl Shifts. Role Played by Isopropyl Substituents in Stabilizing the Putative Triple Bond in Ar′EEAr′ and Ar*PbPbAr*. Issaka Seidu, Michael Seth, and Tom Ziegler.The Journal of Physical Chemistry C 2014, 118 Role of Electronegative Substituents on the Bond Energies in the Grubbs Metathesis Catalysts for M = Fe, Ru, Os. The Journal of Physical Chemistry A 2014, 118 Vibrational Anharmonicities and Reactivity of Tetrafluoroethylene. Robertson, Chris Medcraft, and Dominique R. Journal of the American Chemical Society 2015, 137 Coplanar Oligo(p-phenylenedisilenylene)s as Si═Si Analogues of Oligo(p-phenylenevinylene)s: Evidence for Extended π-Conjugation through the Carbon and Silicon π-Frameworks. Liangchun Li, Tsukasa Matsuo, Daisuke Hashizume, Hiroyuki Fueno, Kazuyoshi Tanaka, and Kohei Tamao.Advances in Quantum Mechanochemistry: Electronic Structure Methods and Force Analysis. The Journal of Physical Chemistry A 2017, 121 Computational Investigation on the Role of Disilene Substituents Toward N2O Activation. Quantum Mechanical Study of N-Heterocyclic Carbene Adsorption on Au Surfaces. Journal of the American Chemical Society 2018, 140 Geometrically Compelled Disilene with λ4-Coordinate SiII Atoms. Computational Ligand Descriptors for Catalyst Design. Chemical Bonding and Bonding Models of Main-Group Compounds. Lili Zhao, Sudip Pan, Nicole Holzmann, Peter Schwerdtfeger, Gernot Frenking.Journal of the American Chemical Society 2020, 142 Metathetical Exchange between Metal–Metal Triple Bonds. Why is Si2H2 Not Linear? An Intrinsic Quasi-Atomic Bonding Analysis. Accurate Ring Strain Energy Calculations on Saturated Three-Membered Heterocycles with One Group 13–16 Element. Alicia Rey Planells, Arturo Espinosa Ferao.Difluorocarbene Generation from TMSCF3: Kinetics and Mechanism of NaI-Mediated and Si-Induced Anionic Chain Reactions.

CARTER TRIPLETY UPDATE

An Update on Multiple Bonding between Heavier Main Group Elements: The Importance of Pauli Repulsion, Charge-Shift Character, and London Dispersion Force Effects. The Journal of Physical Chemistry A 2022, 126 Bond Dissociation Energies of Carbene–Carbene and Carbene–Main Group Adducts. This article is cited by 244 publications.

[benjamin-lpbchem]

Olefin Enables Efficient Solvent-Free Cross-Coupling Reactions

Olefin Enables Efficient Solvent-Free Cross-Coupling Reactions

A cross-coupling reaction is usually carried out in an organic solvent, resulting in the production of a huge amount of solvent waste, which is often hazardous to the environment. Hokkaido University researchers, in Japan, have developed a new approach making room for the execution of more environmentally friendly solvent-free solid-state cross-coupling processes using mechanochemistry. This new…

[howtopronounceenglishcorrectly]

Learn how to pronounce Mechanochemistry in English --- MECHANOCHEMISTRY Pronunciation of Mechanochemistry: /ˌme-kə-nō-ˈke-mə-strē/ noun Definition of Mechanochemistry: chemistry that deals with the conversion of chemical energy into mechanical work (as in the contraction of a muscle) ★ http://Learn2Pronounce.com ★ How to pronounce Mechanochemistry | English pronunciation: https://youtu.be/Zr5OEsYF7Ng

[materialsscienceandengineering]

Simple tool could facilitate discovery of new mechanically-responsive materials

The exploration of mechanophores continues to expand the practical application of these molecules in materials science, organic synthesis, and pharmaceuticals due to their ability to change physically or chemically in response to force. A mechanophore discovered a few years ago by University of Illinois Urbana-Champaign chemists, including Prof. Jeffrey Moore and graduate student Yunyan Sun, can release controlled amounts of carbon monoxide when triggered by mechanical force, which can potentially be used in the human body as a drug to treat diseases and conditions. Called NEO, it depends on the breaking of carbon-carbon bonds, which is common in a variety of mechanochemical transformations. But a major challenge in studying mechanophores is understanding and predicting the reactivity of breaking the C–C bond. Typically, that requires a lot of experimentation and calculation due to the unpredictable vectoral nature of forces like pushing or pulling.

Read more.

[kerinlevesque]

New production process promises to make dental ceramic implants more resilient

MÜLHEIM AN DER RUHR, Germany: Prof. Sami Sandhaus’s development of ceramic dental implants marked a turning point in the advancement of dental implant systems. His first ceramic implant was created in 1960. In the more recent past, clinicians and manufacturers have helped to advance the rather young discipline of ceramic implantology, which still requires considerable research. Now, scientists from the Max-Planck-Institut für Kohlenforschung [Max Planck institute for coal research] in Mülheim an der Ruhr have found a way to produce corundum, a particularly stable variant of alumina, in the form of nanoparticles using simple mechanochemistry in a ball mill. This means, among other things, that materials for dental implants could become more robust and easier to manufacture. from Dental https://www.dental-tribune.com/news/new-production-process-promises-to-make-dental-ceramic-implants-more-resilient/ via http://www.rssmix.com/

[3acesnews]

Mechanochemistry Might Help Us Achieve “Impossible” Reactions

[ginamadigean]

New production process promises to make dental ceramic implants more resilient

MÜLHEIM AN DER RUHR, Germany: Prof. Sami Sandhaus’s development of ceramic dental implants marked a turning point in the advancement of dental implant systems. His first ceramic implant was created in 1960. In the more recent past, clinicians and manufacturers have helped to advance the rather young discipline of ceramic implantology, which still requires considerable research. Now, scientists from the Max-Planck-Institut für Kohlenforschung [Max Planck institute for coal research] in Mülheim an der Ruhr have found a way to produce corundum, a particularly stable variant of alumina, in the form of nanoparticles using simple mechanochemistry in a ball mill. This means, among other things, that materials for dental implants could become more robust and easier to manufacture. from Dental Tips https://www.dental-tribune.com/news/new-production-process-promises-to-make-dental-ceramic-implants-more-resilient/ via http://www.rssmix.com/

[ernestmccullougho5]

New production process promises to make dental ceramic implants more resilient

MÜLHEIM AN DER RUHR, Germany: Prof. Sami Sandhaus’s development of ceramic dental implants marked a turning point in the advancement of dental implant systems. His first ceramic implant was created in 1960. In the more recent past, clinicians and manufacturers have helped to advance the rather young discipline of ceramic implantology, which still requires considerable research. Now, scientists from the Max-Planck-Institut für Kohlenforschung [Max Planck institute for coal research] in Mülheim an der Ruhr have found a way to produce corundum, a particularly stable variant of alumina, in the form of nanoparticles using simple mechanochemistry in a ball mill. This means, among other things, that materials for dental implants could become more robust and easier to manufacture.

[scottadeputy]

New production process promises to make dental ceramic implants more resilient

MÜLHEIM AN DER RUHR, Germany: Prof. Sami Sandhaus’s development of ceramic dental implants marked a turning point in the advancement of dental implant systems. His first ceramic implant was created in 1960. In the more recent past, clinicians and manufacturers have helped to advance the rather young discipline of ceramic implantology, which still requires considerable research. Now, scientists from the Max-Planck-Institut für Kohlenforschung [Max Planck institute for coal research] in Mülheim an der Ruhr have found a way to produce corundum, a particularly stable variant of alumina, in the form of nanoparticles using simple mechanochemistry in a ball mill. This means, among other things, that materials for dental implants could become more robust and easier to manufacture.

[earlhess88]

New production process promises to make dental ceramic implants more resilient

MÜLHEIM AN DER RUHR, Germany: Prof. Sami Sandhaus’s development of ceramic dental implants marked a turning point in the advancement of dental implant systems. His first ceramic implant was created in 1960. In the more recent past, clinicians and manufacturers have helped to advance the rather young discipline of ceramic implantology, which still requires considerable research. Now, scientists from the Max-Planck-Institut für Kohlenforschung [Max Planck institute for coal research] in Mülheim an der Ruhr have found a way to produce corundum, a particularly stable variant of alumina, in the form of nanoparticles using simple mechanochemistry in a ball mill. This means, among other things, that materials for dental implants could become more robust and easier to manufacture.

[inhandnetworks-blog]

“Molecular Levers” Acc healthcare  elerate Reactions

www.inhandnetworks.com

Researchers at Duke University found that a molecule made with a polynorbornene backbone  fault location  can act as a lever to open a ring embedded within the molecule 1000 times faster than a similar ring being tugged at on a polybutadiene scaffold. The discovery could be used to engineer more efficient materials.

Durham, North Carolina – In a forced game of molecular tug-of war, some s healthcare  trings of atoms can act like a lever, accelerating reactions 1000 times faster than other molecules. The discovery suggests that scientists could use these molecular levers to drive chemical and mechanical reactivity among atoms and ultimately engineer more efficient materials.

“We are interested in designing new, stress-responsive materials, so we are trying to develop reactions that are very slow normally but that can be accelerated efficiently by force,” said Duke chemist Steve Craig, who headed the research.

In recent experiments, Craig and his team found that a molecule made with a polynorbornene backbone can act as a lever to open a ring embedded within the molecule 1000 times faster than a similar ring being tugged at on a polybutadiene scaffold. The results, which appear in Nature Chemistry, suggest that a simple change in the backbone may affect the how fast mechanically assisted reactions occur.

Scientists are interested in this type of molecular tug-of-war because many materials break down after repeated cycles of tugging, stress and other forces. “If we can channel usually destructive forces into constructive pathways, we could trigger reactions that make the material stronger when and where it is most useful,” Craig said. Researchers might then be able to extend the material’s lifetime, which might in the long term have applications ranging from composites for airplane frames to biomedical implants.

In the experiment, Craig, who is a professor and chair of the chemistry department, and his team used the equivalent of microscopic tweezers to grab onto two parts of atomic chains and pulled them so that they would break open, or react, in certain spots. The team predicted that one molecule would react more efficiently th cashless vending  an the other but was surprised to find that the force-induced rates differed by three orders of magnitude, an amount that suggests that the polynorbornene backbone can actually accelerate forced reactions the way a crowbar quickens pulling a nail from a wall.

Craig said changes to the molecular group undergoing the reaction may have a much smaller effect than changes to nearby, unreactive molecules like those on the backbone. It is also a good starting point to identify other molecular backbones that are easy to make and have the largest response to changes in nearby reactions, features Craig said might help in developing even better, more responsive materials.

The research was supported by the U.S. Army Research Laboratory, the Army Research Office and National Science Foundation.

Citation: “A Backbone Lever Arm Effect Enhances Polymer Mechanochemistry.” (2012) Klukovich, H. et al. Nature Chemistry. AOP. DOI: 10.1038/NCHEM.1540

Image: Molecular structure from Shutterstock

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