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- Keyword
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- FISCHER-TROPSCH REACTION; DENSITY-FUNCTIONAL THEORY; ULTRASOFT PSEUDOPOTENTIALS; LIQUID POLYOL; COBALT; CATALYSTS; COERCIVITY; PARTICLES; NANOWIRES; IRON (1)
- FISCHER-TROPSCH SYNTHESIS; COERCIVITY; PARTICLES; NANOWIRES (1)
- MAGNETIC NANOPARTICLES; PARTICLES (1)
- MAGNETIC-PROPERTIES; GLASS (1)
- MOLECULAR-DYNAMICS SIMULATIONS; MICROSCOPIC WETTING PHENOMENA; SELF-ASSEMBLED MONOLAYERS; LENNARD-JONES FLUID; SURFACE POLARITY; CAVITY FORMATION; FORCE-FIELD; GRAPHENE; WATER; HYDROPHOBICITY (1)
Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Bf2obn∙Oet2: A Novel Lewis Acid And Its Use In A Regio- And Stereo-Selective Opening Of Trisubstituted Epoxides And Its Application Towards Amphidinolide C, Nicholas A. Morra, Brian Pagenkopf
Bf2obn∙Oet2: A Novel Lewis Acid And Its Use In A Regio- And Stereo-Selective Opening Of Trisubstituted Epoxides And Its Application Towards Amphidinolide C, Nicholas A. Morra, Brian Pagenkopf
Chemistry Publications
The generation of a new Lewis acid (BF2OBn·OEt2) has been reported, and its usefulness has been demonstrated in the regio- and stereoselective ring-opening of trisubstituted epoxides. This Lewis acid is one in a series of new Lewis acids generated from BF3·OEt2 that display varying levels of Lewis acidity. When paired with a modified Shi epoxidation protocol, highly functionalized propionate units, such as those found in a wide variety of natural products, can be accessed. In conjunction with a Mukaiyama oxidative cyclization employing our second generation catalyst Co(nmp)2, this procedure ultimately culminated in the shortest and highest yielding route towards the …
Magnetic Properties Of Co2c And Co3c Nanoparticles And Their Assemblies, Kyler J. Carroll, Zachary J. Huba, Steven R. Spurgeon, Meichun Qian, Shiv N. Khanna, Daniel M. Hudgins, Mitra L. Taheri, Everett E. Carpenter
Magnetic Properties Of Co2c And Co3c Nanoparticles And Their Assemblies, Kyler J. Carroll, Zachary J. Huba, Steven R. Spurgeon, Meichun Qian, Shiv N. Khanna, Daniel M. Hudgins, Mitra L. Taheri, Everett E. Carpenter
Chemistry Publications
Nano-composite material consisting of Co2C and Co3C nanoparticles has recently been shown to exhibit unusually large coercivities and energy products. Experimental studies that can delineate the properties of individual phases have been undertaken and provide information on how the coercivities and the energy product change with the size and composition of the nanoparticles. The studies indicate that while both phases are magnetic, the Co3C has higher magnetization and coercivity compared to Co2C. Through first principles electronic structure studies using a GGA+U functional, we provide insight on the role of C intercalation on …
Controlled Synthesis Of Superparamagnetic Iron-Oxide Nanoparticles By Phase Transformation, Mark A. Laurenzi, Everett E. Carpenter
Controlled Synthesis Of Superparamagnetic Iron-Oxide Nanoparticles By Phase Transformation, Mark A. Laurenzi, Everett E. Carpenter
Chemistry Publications
A synthesis procedure for generating a uniform distribution of iron-oxide nanoparticles from an amorphous precursor is reported. The investigation suggests no evidence of the formation of unwanted surface oxide layers, internal stress, and multiple phases. This is likely because the physical properties of the diffusion fields surrounding the nanoparticles are self-limiting by Fe(II) depletion. Inside the diffusion field surrounding the nucleation site, decreasing Fe(II) concentration results in a decrease in the diffusion rate that continues to decrease until self-limiting kinetic arrest occurs. The initial Fe(II) concentration is established by reducing a system abundant in Fe(III) by means of exposure to …
Wettability Of Pristine And Alkyl-Functionalized Graphane, Davide Vanzo, Dusan Bratko, Alenka Luzar
Wettability Of Pristine And Alkyl-Functionalized Graphane, Davide Vanzo, Dusan Bratko, Alenka Luzar
Chemistry Publications
Graphane is a hydrogenated form of graphene with high bandgap and planar structure insensitive to a broad range of chemical substitutions. We describe an atomistic simulation approach to predict wetting properties of this new material. We determine the contact angle to be 73°. The lower hydrophobicity compared to graphene is explained by the increased planar density of carbon atoms while we demonstrate that the presence of partial charges on carbonand hydrogen atoms plays only a minor role. We further examine the effects of graphane functionalization by alkyl groups of increasing chain lengths. The gradual increase in contact angle with chain …
Size And Phase Control Of Cobalt-Carbide Nanoparticles Using Oh- And Cl- Anions In A Polyol Process, Zachary J. Huba, Everett E. Carpenter
Size And Phase Control Of Cobalt-Carbide Nanoparticles Using Oh- And Cl- Anions In A Polyol Process, Zachary J. Huba, Everett E. Carpenter
Chemistry Publications
Exchange coupled cobalt–carbide nanocomposites and single-phase Co2C nanoparticles were synthesized using the polyol process. Hydroxide and chloride anions were used to controlcarbide phase and particle shape. Synthesized Co x C nanocomposites exhibited average diameters around 300 nm. Co x C nanocomposites synthesized at 0.25 M [OH−] and [Cl−] formed clusters of capped nanorods, whereas synthesis at 0.37 M [OH−] and [Cl−] produced clusters of long blade-like particles. For single-phase Co2C, an [OH−] and [Cl−] of 0.71 M was used and produced clusters of ellipsoidal …
Large-Scale Synthesis Of High Moment Feco Nanoparticles Using Modified Polyol Synthesis, Mehdi Zamanpour, Yajie Chen, Bolin Hu, Kyler Carroll, Zachary J. Huba, E. E. Carpenter, Laura H. Lewis, Vincent G. Harris
Large-Scale Synthesis Of High Moment Feco Nanoparticles Using Modified Polyol Synthesis, Mehdi Zamanpour, Yajie Chen, Bolin Hu, Kyler Carroll, Zachary J. Huba, E. E. Carpenter, Laura H. Lewis, Vincent G. Harris
Chemistry Publications
Binary alloys of Fe and Co have among the highest magnetizations of any transition metal alloy systems, but their affinity to form oxides act to reduce the magnetization of nanoparticles as their size is reduced below ∼30 nm. Here, we demonstrate the synthesis of single phase, size-controlled FeCo nanoparticles having magnetization greater than 200 emu/g via a non-aqueous method in which ethylene glycol served as solvent and reducing agent as well as surfactant. Experiments indicated pure-phase FeCo nanoparticles, having saturationmagnetization up to 221 emu/g for sizes of 20–30 nm, in single batch processes resulting in > 2 g/batch. Post-synthesis oxidation of …