Korea University · Materials Science
Professor Sang Ho Lim's research lab specializes in the development and characterization of advanced magnetic materials, with a focus on nanocrystalline and amorphous alloys for soft and magnetostrictive applications. The lab investigates the effects of elemental doping and processing parameters—such as melt-spinning conditions and magnetic field-assisted sputtering—on magnetic and structural properties, aiming to optimize materials for high-performance sensors, actuators, and biomedical devices. A key research direction involves enhancing magnetostrictive performance in rare-earth transition metal thin films and ribbons for use in precision microsystems and medical interventions.
Figures are computed from collected data and may differ slightly.
Solutions containing the components Au(+), dppe (dppe is bis(diphenylphosphino)ethane), and Br(-) in a 1:1:1 ratio can produce three different types of crystals: type A, orange luminescent solvates of the dimer Au(2)(dppe)(2)Br(2) (Au(2)(μ-dppe)(2)Br(2)·2(OSMe(2)), Au(2)(μ-dppe)(2)Br(2)·2(OCMe(2)), Au(2)(μ-dppe)(2)Br(2)·2(CH(2)Cl(2)), Au(2)(μ-dppe)(2)Br(2)·2(HC(O)NMe(2))); type B, green luminescent solvates of the same dimer (Au(2)(μ-dppe)(2)Br(2)·(NCMe) and Au(2)(μ-dppe)(2)Br(2)·0.5(C(4)H(10)O)
The solid state interconversions of four different crystalline compounds containing the Au2(dppe)2I2 unit (dppe is bis-(diphenylphosphino)ethane) have been observed and characterized through X-ray diffraction and emission spectroscopy. Treatment of AuI in acetone with solid dppe yields the crystalline polymorphs: α-Au2(μ-dppe)2I2·2OCMe2 (1) with orange emission and β-Au2(μ-dppe)2I2·2OCMe2 (2) with green emission. Both polymorphs contain dimeric molecules with three-coordinate gold(I) centers tha
Percutaneous vertebroplasty is a minimally invasive procedure in which polymethylmethacrylate polymer is used to treat painful diseased vertebral bodies. However, despite its minimally invasive nature and relative safety, cement leakage beyond involved vertebral bodies into the venous system can induce devastating cardiovascular complications. Here, the authors report a case of multiple cardiac perforations and pulmonary embolism caused by cement leakage after percutaneous vertebroplasty.
Treasure chests: The Group 11 metals CuI, AgI, and AuI form tetrahedral supramolecular clusters with a rigid threefold-symmetric phosphine ligand. These supramolecular clusters, which assemble by metal–phosphine interactions, are the first to form across an entire group of the periodic table. Cu+ green, Ag+ pale blue, Au+ green, I− red, P purple. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or
The effects of Al on the soft magnetic properties of nanocrystalline Fe73.5−xAlxCu1Nb3Si13.5B9 alloy ribbons are investigated in the composition range of 0≤x≤1.0. The relative initial permeability at 1 kHz is found to increase by the addition of Al, and reaches the peak value at x=0.1. The coercivity decreases, rather significantly, with the Al content in the whole composition range investigated in the present work, the values of the coercivity being 12.5 mOe at x=0 and 9.3 mOe at x=1.0. The mag
An array of coordination-driven supramolecular metal-ligand clusters has been synthesized using polytopic phosphine ligands and coinage metals (Cu(+), Ag(+), Au(+)). Rigid 3-fold or 2-fold symmetric phosphine ligands have been prepared: 1,3,5-tris((4-(diphenylphosphino)ethynyl)phenyl)benzene) (tppepb, L(1)), 1,4-bis((diphenylphosphino)ethynyl)benzene (1,4-dppeb, L(2)), 1,3-bis((diphenylphosphino)ethynyl)benzene (1,3-dppeb, L(3)), 2,6-bis((diphenylphosphino)ethynyl)pyridine (2,6-dppep, L(4)), and
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Soon Ho Lim, James L. White; Development and characterization of orientation of anisotropic disk and fibrous particles in a thermoplastic matrix. J. Rheol. 1 April 1990; 34 (3): 343–366. https://doi.org/10.1122/1.550132 Download citation file: Ris (Zotero) Reference Manager Eas
Four crystalline dimers of the type, Au(I)(2)(μ-PnP)(2)I(2), where PnP is PPh(2)(CH(2))(n)PPh(2) with n = 3, 4, 5, and 6 have been prepared and characterized by single-crystal X-ray diffraction and by (31)P NMR and infrared spectroscopy. Au(I)(2)(μ-P3P)(2)I(2) and Au(I)(2)(μ-P6P)(2)I(2) are centrosymmetric dimers with the planar Au(I)P(2)I units oriented in antiparallel fashion. Remarkably, noncentrosymmetric Au(I)(2)(μ-P5P)(2)I(2) has its planar Au(I)P(2)I units oriented in parallel manner. Au(
The magnetostriction of melt-spun ribbons of Dyx(Fe1−yBy)1−x (x=0.2, 0.25, 0.3; 0≤y≤0.2) alloys is systematically investigated as a function of the wheel speed during melt quenching. As the wheel speed increases from 10 to 50 m/s, the magnetic softness improves with the wheel speed rather continuously for the alloys with the Dy content x=0.2 and 0.25 but it exhibits a maximum at the wheel speed of 30 or 40 m/s for the alloys with the highest B content (x=0.3). The softness also improves with the
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