Capacitive and Oxidant Generating Properties of Black-Colored TiO₂ Nanotube Array Fabricated by Electrochemical Self-Doping

Kim, Choonsoo,Kim, Seonghwan,Lee, Jaehan,Kim, Jiye,Yoon, Jeyong American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.14

<P>Recently, black-colored TiO<SUB>2</SUB> NTA (denoted as black TiO<SUB>2</SUB> NTA) fabricated by self-doping of TiO<SUB>2</SUB> NTA with the amorphous phase led to significant success as a visible-light-active photocatalyst. This enhanced photocatalytic activity is largely attributed to a higher charge carrier density as an effect of electrochemical self-doping resulting in a higher optical absorbance and lower transport resistance. Nevertheless, the potential of black TiO<SUB>2</SUB> NTA for other electrochemical applications, such as a supercapacitor and an oxidant-generating anode, has not been fully investigated. Here, we report the capacitive and oxidant generating properties of black TiO<SUB>2</SUB> NTA. The black TiO<SUB>2</SUB> NTA exhibited significantly a high value for areal capacitance with a good rate capability and novel electrocatalytic activity in generating <SUP>•</SUP>OHs and Cl<SUB>2</SUB> compared to pristine TiO<SUB>2</SUB> NTA with the anatase phase. This study suggests that the black TiO<SUB>2</SUB> NTA be applied as a supercapacitor and an oxidant generating anode.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-14/acsami.5b00123/production/images/medium/am-2015-00123w_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00123'>ACS Electronic Supporting Info</A></P>

(Poly(3,4-ethylenedioxythiophene):Polystyrene Sulfonate):Polytetrafluoroethylene for Use in High-Performance and Stable Bottom-Contact Organic Field-Effect Transistors

Kim, Jiye,Kim, Hyekyoung,Kim, Se Hyun,Park, Chan Eon American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.2

<P>We successfully fabricated highly stable pentacene-based bottom-contact organic field-effect transistors (OFETs) with good charge injection properties at the electrode/organic semiconductor interface, obtained by optimizing the composition of solution-processed (poly(3,4-ethylenedioxythiophene):polystyrene sulfonate):polytetrafluoroethylene ((PEDOT:PSS):PTFE)-treated Au source/drain (S/D) electrodes. The (PEDOT:PSS):PTFE layer was deposited on the Au layer by spin-coating a mixture solution. The work function of the electrode increased from 4.84 to 5.21 eV as the PTFE concentration increased, accompanied by an interface dipole at the electrode surface. The optimized (PEDOT:PSS):PTFE (0.95:0.05)-treated electrodes significantly reduced the charge injection barrier at the electrode/semiconductor interface to achieve efficient charge transfer in the OFETs. Bottom-contact OFETs prepared with the optimized (PEDOT:PSS):PTFE-treated S/D electrodes had a field-effect mobility of 0.16 cm(2)/(V.s), which exceeded that of PEDOT:PSS-treated S/D electrodes (0.073 cm(2)/(V.s)). The operational stability of the optimized device was remarkable under gate-bias stress (V-G = -40 V over 3 h).</P>

Evaluation of thin-film nanocomposite RO membranes using TiO2 nanotubes and TiO2 nanoparticles: a comparative study

Kim, Jungchan,Baek, Youngbin,Hong, Sung Pil,Yoon, Hongsik,Kim, Seonghwan,Kim, Choonsoo,Kim, Jiye,Yoon, Jeyong Taylor Francis 2016 Desalination and Water Treatment Vol.57 No.51

3D Hollow Framework Silver Nanowire Electrodes for High-Performance Bottom-Contact Organic Transistors

Kim, Jiye,Lee, So Hee,Kim, Haekyoung,Kim, Se Hyun,Park, Chan Eon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.26

<P>We successfully fabricated high performance bottom-contact organic field-effect transistors (OFETs) using silver nanowire (AgNW) network electrodes by spray deposition. The synthesized AgNWs have the dimensions of 40–80 nm in diameter and 30–80 μm in length and are randomly distributed and interconnected to form a 3D hollow framework. The AgNWs networks, deposited by spray coating, yield an average optical transmittance of up to 88% and a sheet resistance as low as 10 ohm/sq. For using AgNWs as source/drain electrodes of OFETs with a bottom-contact configuration, the large contact resistance at the AgNWs/organic channel remains a critical issue for charge injection. To enhance charge injection, we fabricate semiconductor crystals on the AgNW using an adsorbed residual poly(<I>N</I>-vinylpyrrolidone) layer. The resulting bottom-contact OFETs exhibit high mobility up to 1.02 cm<SUP>2</SUP>/(V s) and are similar to that of the top-contact Au electrodes OFETs with low contact resistance. A morphological study shows that the pentacene crystals coalesced to form continuous morphology on the nanowires and are highly interconnected with those on the channel. These features contribute to efficient charge injection and encourage the improvement of the bottom-contact device performance. Furthermore, the large contact area of individual AgNWs spreading out to the channel at the edge of the electrode also improves device performance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-26/acsami.5b02610/production/images/medium/am-2015-02610b_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b02610'>ACS Electronic Supporting Info</A></P>

Ectopic pleomorphic adenoma on subcutaneous plane of the cheek

Kim, Yong Hun,Yoon, Hyung Woo,Kim, Jiye,Kim, Sug Won Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.1

Pleomorphic adenoma is the most common benign tumor of the salivary gland. Pleomorphic adenoma occurs most commonly in the parotid gland but it may involve other salivary gland such as submandible or lingual. We report an ectopic pleomorphic adenoma in the subcutaneous layer of the face. A woman presented with a mass of the nasolabial fold. After excision of the mass, it was revealed as an pleomorphic adenoma pathologically. An ectopic pleomorphic adenoma which was located in the subcutaneous layer of the face is very rare in medical literature.

Epidemiologic study of hand and upper extremity injuries by power tools

Kim, Yong Hun,Choi, Jin-hee,Chung, Yoon Kyu,Kim, Sug Won,Kim, Jiye Korean Society of Plastic and Reconstructive Surge 2019 Archives of Plastic Surgery Vol.46 No.1

Background Hand injuries caused by chain saws, electric saws, and hand grinders range from simple lacerations to tendon injuries, fractures, and even amputations. This study aimed to understand the distribution of various types of hand and upper extremity injuries caused by power tools, in order to help prevent them, by investigating the incidence and cause of power tool injuries treated over a 4-year period at a single institution in Korea. Methods We reviewed the medical records of patients who visited a single institution for power tool-induced injuries from 2011 to 2014. The distribution of sex, age, injured body part, type of injury, and mechanism of injury sustained by patients who received hand and upper extremity injuries from using an engine saw, electric saw, or hand grinder was evaluated. Results Among 594 subjects who were injured by power tools, 261 cases were hand and upper extremity injuries. The average age was 53.2 years. Tendon injury was the most common type of injury. An electric saw was the most common type of power tool used. More injuries occurred in non-occupational settings than in occupational settings. Conclusions In this study, power tool-induced hand and upper extremity injuries were mostly caused by direct contact with electric saw blades. More injuries occurred due to non-occupational use of these tools, but the ratios of amputations and structural injuries were similar in the non-occupational and occupational groups.

Fasciotomy in compartment syndrome from snakebite

Kim, Yong Hun,Choi, Jin-hee,Kim, Jiye,Chung, Yoon Kyu Korean Society of Plastic and Reconstructive Surge 2019 Archives of Plastic Surgery Vol.46 No.1

Background Local symptoms and signs of snake envenomation mimic the clinical features of compartment syndrome. It is important to measure the intracompartmental pressure to diagnose compartment syndrome. In this study, we present our experiences of confirming compartment syndrome and performing fasciotomy in snakebite patients based on high intracompartmental pressure findings. Methods The medical records of patients who visited the trauma center of Wonju Severance Christian Hospital from January 2010 to December 2015 for the management of venomous snakebite were retrospectively reviewed. Starting in 2014, fasciotomy was performed in patients with an intracompartmental pressure of more than 40 mmHg in addition to the clinical symptoms of compartment syndrome. Results A total of 158 patients with snakebite came to the hospital within 48 hours for treatment. Most patients (110 patients) were bitten at the upper extremities (69.6%). Since 2014, 33 out of 59 patients were suspected to have compartment syndrome, and their intracompartmental pressures were measured. Seventeen of those patients had a high intracompartmental pressure (average, 49.6 mmHg; range, 37-88 mmHg), and fasciotomy was performed. Conclusions In this study, as many as 10.8% of all cases were in need of fasciotomy when compartment syndrome was diagnosed by measuring the intracompartmental pressure. Previously, it was reported that fasciotomy was not required in many cases of compartment syndrome originating from snakebite. However, some patients may develop very severe compartment syndrome, requiring fasciotomy.

Electrochemical Peroxodisulfate (PDS) Generation on a Self-Doped TiO₂ Nanotube Array Electrode

Kim, Jiye,Lee, Changha,Yoon, Jeyong American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.33

<P>Peroxodisulfate (PDS, S<SUB>2</SUB>O<SUB>8</SUB><SUP>2-</SUP>) is one of the strong oxidants (<I>E</I>°[S<SUB>2</SUB>O<SUB>8</SUB><SUP>2-</SUP>/HSO<SUB>4</SUB><SUP>-</SUP>] = 2.12 V<SUB>NHE</SUB>), which is widely used for radical polymerization or wastewater treatment. In electrochemical PDS generation, its efficiency highly depends on the •OH generating electrode materials. A boron-doped diamond (BDD) used in electrochemical PDS generation is very expensive prompting the need for new electrode materials for PDS generation. This study reports the self-doped TiO<SUB>2</SUB> nanotube array electrodes (blue and black TNAs) for PDS generation which are cheap and effective for generating a significant amount of •OH and comparable to BDD electrodes. Blue and black TNA electrodes were excellent for PDS generation exhibiting high current efficiencies for PDS generation (46% and 22%, respectively). Similar to the BDD electrode, it was also confirmed that •OH was the key precursor to the PDS generation on the self-doped TNA electrodes from the linear relationship between the PDS generation rate and •OH generation.</P> [FIG OMISSION]</BR>

RuO₂ coated blue TiO₂ nanotube array (blue TNA-RuO₂) as an effective anode material in electrochemical chlorine generation

Kim, Jiye,Kim, Choonsoo,Kim, Seonghwan,Yoon, Jeyong THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.66 No.-

<P><B>Abstract</B></P> <P>Blue TiO<SUB>2</SUB> nanotube array (blue TNA) has gained interest as a highly effective and low-cost material in electrochemical chlorine generation. Hydroxyl radicals mediated chlorine generation is the major pathway (indirect pathway) on the blue TNA which showed lower efficiency than direct pathway on dimensionally stable anodes. In this study, RuO<SUB>2</SUB> coated blue TNA (blue TNA-RuO<SUB>2</SUB>) was fabricated, which exhibited a higher current efficiency (96%) than that of the blue TNA and RuO<SUB>2</SUB>. The excellent performance of the blue TNA-RuO<SUB>2</SUB> is attributed to the simultaneous reaction of direct pathway on the RuO<SUB>2</SUB> and indirect pathway on the blue NTA together.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Correction of a nasal soft triangle deficiency as a complication of augmentation rhinoplasty

Kim, Eon Su,Heo, Jae Won,Yang, Chae Eun,Kim, Jiye,Kim, Sug Won Korean Cleft Palate-Craniofacial Association 2021 Archives of Craniofacial Surgery Vol.22 No.3

The soft tissue triangle is an easily recognizable subunit of the nose. Therefore, deformities in this region resulting from trauma or complications after cosmetic surgery can have serious cosmetic impacts. Various reconstruction choices exist for deformities such as depression of the soft triangle but choosing the most appropriate treatment in each case remains a challenge. In the case described herein, a patient underwent augmentation rhinoplasty with a silastic implant and experienced implant exposure in the soft triangle area. After implant removal, the patient complained of depression in this area. The authors effectively solved this problem through a de-epithelialized composite tissue graft. In this report, we present this case and review similar cases of reconstruction of the soft triangle.