They found that the MXene coating offered a sixfold reduction in friction compared with untreated surfaces, which puts it in the same low-friction ballpark as graphene and molybdenum disulfide. The MXene coating maintained its performance throughout the 100,000 cycles, offering at least twice the wear life of rival 2D materials.
by Mark Peplow, special to C&EN | May 06, 2021
C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - SULFUR C&EN | Periodic Table Element Symbols Ac Ag Al Am Ar As At Au B Ba Be Bh Bi Bk Br C Ca Cd Ce Cf Cl Cm Co Cs Cr Cu Db Ds Dy Es Er Eu F Fe Fm Fr Ga Gd Ge H He Hf Hg Ho Hs I In Ir K Kr La Li Lr Lu Md Mg Mn Mo Mt N Na Nb Nd Ne Ni No Np O Os P Pa Pb Pd Pm Po Pr Pt Pu Ra Rb Re Rf Rh Rn Ru S Sb Sc Se Sg Si Sm Sn Sr Ta Tb Tc Te Th Ti Tl Tm U Uub Uuq Uuu V W Xe Y Yb Zn Zr Element Names Actinium Aluminum Americium Antimony Argon Arsenic Astatine Barium Berkelium Beryllium Bismuth Bohrium Boron Bromine Cadmium Calcium Californium Carbon Cerium Cesium Chlorine Chromium Cobalt Copper Curium Darmstadtium+ Dubnium Dysprosium Einsteinium Erbium Europium Fermium Fluorine Francium Gadolinium Gallium Germanium Gold Hafnium Hassium Helium Holmium Hydrogen Indium Iodine Iridium Iron Krypton Lanthanum Lawrencium Lead Lithium Magnesium Manganese Meitnerium Mendelevium Mercury Molybdenum Neodymium Neon Neptunium Nickel Niobium Nitrogen Nobelium Osmium Oxygen Palladium Phosphorus Platinum Plutonium Polonium Potassium Praseodymium Promethium Protactinium Radium Radon Rhenium Rhodium Rubidium Ruthenium Rutherfordium Samarium Scandium Seaborgium Selenium Silicon Silver Sodium Strontium Sulfur Tantalum Technetium Tellerium Terbium Thallium Thorium Thulium Tin Titanium Tungsten Uranium Vanadium Xenon Ytterbium Yttrium Zinc Zirconium Author Names M.
by AMOS B. SMITH III, UNIVERSITY OF PENNSYLVANIA | September 08, 2003
Stiefel became a leader in molybdenum chemistry, elucidating redox states and proposing the first comprehensive mechanism for the action of molybdenum enzymes involving coupled proton and electron transfer. In 1974, Stiefel became an investigator at the now-defunct Charles F. Kettering Research Laboratory, Yellow Springs, Ohio. At Kettering, he pursued his interests in the biological aspects of molybdenum chemistry, which included nitrogen fixation. His group prepared the first oxo molybdenum(VI) complexes that resembled the active sites of molybdenum enzymes. This work involved collaborations using synchrotron-based X-ray absorption spectroscopy that demonstrated the power of the extended X-ray absorption fine structure (EXAFS) technique in bioinorganic chemistry. The potential technological connection to molybdenum sulfur chemistry brought Stiefel to Exxon as a research associate in 1980. At Exxonnow ExxonMobilStiefel and colleagues have investigated internal redox reactions in which addition of oxidants remarkably leads to reduction of molybdenum and other metal centers.
February 07, 2000
Two-dimensional materials like graphene and molybdenum disulfide have been tested in applications from photovoltaics to sensors, but these gossamer sheets are fragile and can be difficult to integrate into devices. So J. Nathan Hohman of the Molecular Foundry at Lawrence Berkeley National Laboratory has been developing materials that pack 2-D properties into more robust 3-D structures, using organic ligands to sandwich flat atomic layers and also fine-tune their optoelectronic qualities.
by Mark Peplow, special to C&EN | October 10, 2018
Top MoS2 'onions' help reduce wear and tear Solid lubricants like molybdenum disulfide and related compounds are useful in vacuum, space, and other applications where liquids are impractical to use. But these materials often decompose in the presence of oxygen or water. Now, researchers in the electrical engineering division of the University of Cambridge have developed a procedure for preparing MoS2 films that results in a highly wear-resistant product that stands up to high levels of humidity [Nature, 407, 164 (2000)].
September 18, 2000
The past few years—and especially the past few months—have seen several materials, including boron nitride, molybdenum disulfide, metal carbides, and others, join the 2-D club. Researchers are investigating the fundamental properties of these materials and devising methods for preparing them in large quantities.
by Mitch Jacoby | October 08, 2012