Sunhee Kim's research while affiliated with University of Pittsburgh and other places

... It is within this region of five stellar radii where SiO + aluminum (Al 2 O 3 ) dust grain surface reactions can occur, while the AlO + silicon (SiC) dust grain surface reaction is more likely further from the stellar surface. Such surface reaction processes have been investigated for similar aluminum-bearing molecules (AlCO and AlCN), demonstrating the feasibility of the proposed mechanism (Casarin et al. 2000;Kim et al. 2007;Van de Sande et al. 2019). Further out, near the outer CSE, high-energy ionizing radiation would increase the likelihood of an ion-neutral collision, such as Al + + SiO, a binary collision between an ion and a neutral molecule in which the ion induces a dipole moment in the neutral molecule, increasing the longrange attractive forces. ...

... In the most common neutralization technologies use is made of mixtures that consist of nanoparticles of such metal oxides as MgO, CaO, ZnO, SrO, TiO 2 , Al 2 O 3 , CuO, Fe 2 O 3 with grain diameters ranging from a few nanometers to several dozen micrometers . The nanocrystalline MgO with grains of a 4 µm diameter and a specific surface exceeding 500 m 2 /g is characterized by a particularly large surface and activity [14][15][16][17][18]30,34]. Reducing the size of nanocrystallites causes a significant increase in the share of surface atoms, including those occupying edge and corner places, particularly as their network defects comprise the active sites of the oxide neutralizer [34]. ...

... The increase of Knudsen diffusion into porous media at the onset of desorption has been demonstrated experimentally (Ballinger et al. 1989). Outward diffusion of an adsorbate through MgO powders with nanosized interparticle voids showed both a fast and a slow diffusion channel, suggestive of bonding on two types of sites, and thermal desorption followed a symmetric TPD curve unlike a first-order curve (Kim et al. 2009, their Figure 4). We suggest that these experimental results are similar to our findings that desorption from a powder is slower than an exponential decay of the adsorbate reservoir even for well-defined sites. ...

... Casarin et al. performed a density functional theory (DFT) based chemisorption study of the interaction of CO with an Al 2 O 3 surface and found that the preferred orientation consists of the C atom reacting perpendicular with the surface to form a chemical bond (Casarin et al. 2000). Following this bonding interaction, desorption of AlCO is possible; analogous to AlCN desorption observed by Kim et al. (2007) following the ClCN + alumina surface reaction. Using the Very Large Telescope, Karovicova et al. (2013) observed a prominent Al 2 O 3 dust shell within 2 stellar radii of the oxygen-rich stars S Ori, R Cnc, and GX Mon, while Gobrecht et al. (2016) modeled the dust chemistry of IK Tau and came to the same conclusion. ...

... 38 In the presence of HA and FA, the amount of surface hydroxyl groups increased aer the PSMPs adsorption of As(III), more so in the presence of HA as compared to FA because the molecular weight, structural complexity, and number of oxygencontaining functional groups are higher on HA. 39 Aer adsorption, the FTIR band associated with hydroxyl group vibrations was red-shied to a lower energy, indicating that the energy required for the vibration of the hydroxyl group is less and the group is less stable. 40 Thus, considering that the adsorption of metal ions is related to the chemical functions of oxygen on the adsorbent, 41 we speculate that As(III) may interact with the surface -OH of PSMPs. ...

... With the goal of evaluating the transport dynamics of CWAs in Zr-based MOFs, our research efforts began by developing a method for monitoring molecular transport under pristine conditions. Our approach, adapted from Kim et al., 46 utilized in situ infrared (IR) spectroscopy operating under ultrahigh vacuum (UHV) conditions to monitor changes that occur during exposure, diffusion, and desorption of the analytes of interest within porous materials, specifically Zr-based MOFs. 30,46−48 Initial diffusion studies were performed on UiO-66 with a series of linear and aromatic hydrocarbons to validate the method. ...

... As for the reason why Metal/Al 2 O 3 was selected as the co-milling regent of MCT of HCB, many previous studies demonstrated its effectiveness in the organic pollutants treatment from their excellent adsorption and chemical composition properties [48][49][50][51][52]. HCB was selected as the model pollutant due to its universality, typical symmetry and polysubstitution. ...

... Apart from above mentioned multifunctional materials, Al 2 O 3 , as a catalyst and/or catalyst support used in organic pollutants elimination has been endowed heightened interests owing to its large surface and pore volume (Li et al., 2010;Lu et al., 2017). In addition, among multiple kinds of Al 2 O 3 crystalline forms, g-Al 2 O 3 , attributed to its specific defective spinel structure, processes large amounts of surface-adsorbed oxygen species, Brønsted and Lewis acid sites (Kim et al., 2005;Liu et al., 2017c;Lu et al., 2017). Given that, Lu et al. (2017) successfully synthesized micro/nano-g-Al 2 O 3 rod-like fibers to perform the gaseous degradation of 1chloronaphthalene (CN-1), and the proposed mechanism is shown in Fig. S1. ...

... For instance, Pt@CoO yolk@shell CNHSs were found to exhibit the typical catalytic activity of Pt for the hydrogenation of ethylene. Dedicated experiments revealed that, because of their small sizes, the molecular reactants and byproducts could approach the surface of the buried Pt core by permeating through the porous CoO shell [189,193]. Encouraged by the success of prototypical biological assays, in which FePt@CoS 2 and Co@Au yolk@shell CNHSs were proven to act as effective killers for cancer cells [165] and as carriers for gene delivery [187], respectively, FePt@Fe 3 O 4 yolk@shell CNHSs were assessed for their potential as MRI contrast agents and as anticancer drugs [188]. ...