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Choi, Jongmin,Park, Sung-Hae,Kwon, Young Soo,Lim, Jongchul,Song, In Young,Park, Taiho The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.70
<P>A simple selective etching process easily removed a 2nd anodized TiO<SUB>2</SUB> nanotubes (TNTs) layer from a physically stable 1st anodized TNTs layer to produce noncurling, freestanding, large-area aligned doubly open-ended TNTs. These TNTs were easily transferred to a conducting glass for use in fabricating front-illuminated dye sensitized solar cells.</P> <P>Graphic Abstract</P><P>A simple selective etching process easily removed a 2nd anodized layer from a physically stable 1st anodized layer to produce noncurling, freestanding, large-area aligned doubly open-ended TiO<SUB>2</SUB> nanotubes (TNTs). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc33629d'> </P>
Choi, Jongmin,Kang, Gyeongho,Park, Taiho American Chemical Society 2015 Chemistry of materials Vol.27 No.4
<P>We prepared well-defined hierarchical structures comprising doubly open-ended TiO<SUB>2</SUB> nanotube (NT) arrays covered with various layers of few-nanometer-sized TiO<SUB>2</SUB> nanoparticles (NPs) to investigate the electron collection mechanisms in homogeneous hybrid structures. We found that competitive electron transport pathways (direct transport through the NT and randomized transport through the NPs) are present in the homogeneous hybrid structures. Photoinduced electrons generated at the few-nanometer-sized TiO<SUB>2</SUB> NPs directly connected with TiO<SUB>2</SUB> NTs (e.g., isolated and single-layer NPs on the surface of NTs) dominantly traveled to the NTs. With an increasing number of TiO<SUB>2</SUB> NP layers, photoinduced electrons are randomly transported through the TiO<SUB>2</SUB> NP layers. Enhanced light harvesting and efficient charge collection (∼95%) caused by the increased amounts of dye loading and the direct transport through the NT, respectively, are achieved in a structure with ∼1.4 layers of few-nanometer-sized TiO<SUB>2</SUB> NPs, resulting in a power conversion efficiency of 11.3% with a <I>J</I><SUB>SC</SUB> value (22.9 mA/cm<SUP>2</SUP>) close to the theoretical value (∼26 mA/cm<SUP>2</SUP>) of a N719-based dye-sensitized solar cell.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-4/cm504516n/production/images/medium/cm-2014-04516n_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm504516n'>ACS Electronic Supporting Info</A></P>
Choi, In-Ae,Lee, Cheol Soon,Kim, Hahn Young,Choi, Dong-Hee,Lee, Jongmin MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.7
<P>To develop new rehabilitation therapies for chronic stroke, this study examined the effectiveness of task-specific training (TST) and TST combined with DNA methyltransferase inhibitor in chronic stroke recovery. Eight weeks after photothrombotic stroke, 5-Aza-2′-deoxycytidine (5-Aza-dC) infusion was done on the contralesional cortex for four weeks, with and without TST. Functional recovery was assessed using the staircase test, the cylinder test, and the modified neurological severity score (mNSS). Axonal plasticity and expression of brain-derived neurotrophic factor (BDNF) were determined in the contralateral motor cortex. TST and TST combined with 5-Aza-dC significantly improved the skilled reaching ability in the staircase test and ameliorated mNSS scores and cylinder test performance. TST and TST with 5-Aza-dC significantly increased the crossing fibers from the contralesional red nucleus, reticular formation in medullar oblongata, and dorsolateral spinal cord. Mature BDNF was significantly upregulated by TST and TST combined with 5-Azd-dC. Functional recovery after chronic stroke may involve axonal plasticity and increased mature BDNF by modulating DNA methylation in the contralesional cortex. Our results suggest that combined therapy to enhance axonal plasticity based on TST and 5-Aza-dC constitutes a promising approach for promoting the recovery of function in the chronic stage of stroke.</P>
Choi, Jongmin,Song, Seulki,Kang, Gyeongho,Park, Taiho American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.17
<P>We systematically investigated the charge transport properties of doubly or singly open-ended TiO<SUB>2</SUB> nanotube arrays (DNT and SNT, respectively) for their utility as electrodes in dye-sensitized solar cells (DSCs). The SNT or DNT arrays were transferred in a bottom-up (B-up) or top-up (T-up) configuration onto a fluorine-doped tin oxide (FTO) substrate onto which had been deposited a 2 μm thick TiO<SUB>2</SUB> nanoparticle (NP) interlayer. This process yielded four types of DSCs prepared with SNTs (B-up or T-up) or DNT (B-up or T-up). The photovoltaic performances of these DSCs were analyzed by measuring the dependence of the charge transport on the DSC geometry. High resolution scanning electron microscopy techniques were used to characterize the electrode cross sections, and electrochemical impedance spectroscopy was used to characterize the electrical connection at the interface between the NT array and the TiO<SUB>2</SUB> NP interlayer. We examined the effects of decorating the DNT or SNT arrays with small NPs (sNP@DNT and sNP@SNT, respectively) in an effort to increase the extent of dye loading. The DNT arrays decorated with small NPs performed better than the decorated SNT arrays, most likely because the Ti(OH)<SUB>4</SUB> precursor solution flowed freely into the array through the open ends of the NTs in the DNT case but not in the SNT case. The sNP@DNT-based DSC exhibited a better PCE (10%) compared to the sNP@SNT-based DSCs (6.8%) because the electrolyte solution flow was not restricted, direct electron transport though the NT arrays was possible, the electrical connection at the interface between the NT array and the TiO<SUB>2</SUB> NP interlayer was good, and the array provided efficient light harvesting.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-17/am503934s/production/images/medium/am-2014-03934s_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503934s'>ACS Electronic Supporting Info</A></P>
JONGMIN CHOI,HYUN JOON CHOUNG,YOUNGJU JOO,HOON KANG,김용찬 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.3
The cooling load in winter is significant in buildings and hotels because of the usage of office equipments and the high efficiency of wall insulation. Hence, the development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the performance of a simultaneous heating and cooling heat pump was investigated in the heat recovery mode (HR mode). The system adopted a variable speed compressor using R-410A with four indoor units and one outdoor unit. In the HR mode, the capacity and COP were improved as compared with those in the cooling or heating mode because the waste heat in the outdoor unit was utilized as useful heat in the indoor units. However, energy imbalance between heating and cooling capacities of each indoor unit was observed in the 2H–1C HR mode. Therefore, the performance of the system in the 2H–1C HR mode was enhanced by controlling refrigerant flow rate through the outdoor unit.