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Room-temperature sputtered electrocatalyst WSe2 nanomaterials for hydrogen evolution reaction

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Journal of Energy Chemistry 2020年第8期29卷 107-111,I0004页

作者： Jae Hyeon Nam Myeong Je Jang Hye yeon Jang Woojin Park Xiaolei Wang Sung Mook choi Byungjin Cho Department of Advanced Material Engineering Chungbuk National UniversityChungdae-ro 1Seowon-GuCheongjuChungbuk 28644Republic of Korea Surface Technology Department Korea Institute of Materials Science797 ChangwonDaeroSungsan-guChangwon 51508Republic of Korea Advanced Materials Engineering Korea University of Science and Technology(UST)217 Gajeong-roYuseong-guDaejeon 34113Republic of Korea Department of Chemical and Materials Engineering University of Alberta9211116 Street NWEdmontonAlberta T6C 1H9Canada

The low-temperature physical vapor deposition process of atomically thin two-dimensional transition metal dichalcogenide(2D TMD) has been gaining attention owing to the cost-effective production of diverse electrochemical catalysts for hydrogen evolution reaction(HER) applications. We, herein, propose a simple route toward the cost-effective physical vapor deposition process of 2D WSe2 layered nanofilms as HER electrochemical catalysts using RF magnetron sputtering at room temperature(<27℃). By controlling the variable sputtering parameters, such as RF power and deposition time, the loading amount and electrochemical surface area(ECSA) of WSe2 films deposited on carbon paper can be carefully determined. The surface of the sputtered WSe2 films are partially oxidized, which may cause spherical-shaped particles. Regardless of the loading amount of WSe2, Tafel slopes of WSe2 electrodes in the HER test are narrowly distributed to be ~120–138 mV dec-1, which indicates the excellent reproducibility of intrinsic catalytic activity. By considering the trade-off between the loading amount and ECSA, the best HER performance is clearly observed in the 200 W-15 min sample with an overpotential of 220 mV at a current density of 10 mA cm-2. Such a simple sputtering method at low temperature can be easily expanded to other 2D TMD electrochemical catalysts, promising potentially practical electrocatalysts.

关键词： Two dimensional nanomaterials Sputtering WSe2 nanofilm Electrocatalyst Hydrogen evolution reaction

Finger compartment syndrome due to a high-pressure washer injury:A case report

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World Journal of Clinical Cases 2023年第13期11卷 3017-3021页

作者： Jun Ho choi Seung yeon choi Jae Ha hwang Kwang Seog Kim Sam Yong Lee Department of Plastic and Reconstructive Surgery Chonnam National University Hospital Chonnam National University Medical SchoolGwangju 61469South Korea

BACKGROUND Although the finger compartment syndrome is not common,it compresses the neurovascular bundles in a limited space and blocks blood flow to the fingers,causing necrosis of the *** fasciotomy through unilateral or bilateral midline release of the finger can achieve decompression of the finger ***,we report a case of the compartment syndrome in a finger injury caused by a high-pressure water flow which is commonly used in car washing *** SUMMARY A 60-year-old man injured his right middle finger while using a high-pressure washer at a car washing *** patient complained of severe pain in his middle finger and a 0.2 cm punctured open wound on the volar side of the distal phalangeal joint of the middle *** fingertip was pale,numb,and characterized by severe swelling and a limited range of *** radiography showed that there was no fracture in the *** decompression was performed through finger fasciotomy by bilateral midline *** the second day after surgery,the color of the fingertip returned to pink,swelling was resolved,and the range of motion returned to *** sensation of the fingertip was completely restored,and the capillary refill test and pinprick test were *** The fingertip compartment syndrome can be caused by a high-pressure water flow damage to the fingers when using high-pressure washers at a car washing *** avoid finger necrosis,rapid diagnosis of the finger compartment syndrome and appropriate digital decompression are essential to better outcome.

关键词： Compartment syndrome Crush injuries Fasciotomy Finger injuries Case report

SnO2@Co3O4 hollow nano-spheres for a Li-ion battery anode with extraordinary performance

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Nano Research 2014年第8期7卷 1128-1136页

作者： Won-Sik Kim Yoon hwa Hong-Chan Kim Jong-Hyun choi Hun-Joon Sohn Seong-Hyeon Hong Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National University Seoul151-744 Republic of Korea

SnO2@Co3O4 hollow nano-spheres have been prepared using the template-based sol-gel coating technique and their electrochemical performance as an anode for lithium-ion battery （LIB） was investigated. The size of synthesized hollow spheres was about 50 nm with the shell thickness of 7-8 nm. The fabricated SnO2@Co3O4 hollow nano-sphere electrode exhibited an extraordinary reversible capacity （962 mAh-g-1 after 100 cycles at 100 mA-g-1）, good cyclability, and high rate capability, which was attributed to the Co-enhanced reversibility of the Li20 reduction reaction during cycling.

关键词： hollow sphere lithium-ion battery anode SnO2 Co3O4

Toxicological study of the hepatotherapeutic herbal formula,Chunggan extract,in beagle dogs

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World Journal of Gastroenterology 2006年第46期12卷 7497-7502页

作者： Woo-Jin choi Jang-Woo Shin Jin-Young Son Dong-Seok Seo Hark-Soo Park Seung-Hyun Han Ha-lung Sung Jung-Hyo Cho Chong-Kwan Cho hwa-Seung Yoo yeon-Weol Lee Chang-Gue Son East-West Cancer Center Dunsan Oriental Hospital of Oriental medical Collage of Daejeon University 1136Dunsan-dong Seo-gu Daejeon 302-122 South Korea Safety Assess-ment Center Korea Testing and Research Institute for Chemical Industry 7-6 Gomak-ri Wolgot-myeon Gimpo-si Kyonggi-doKorea Department of Oromaxillofacial Infection & Immunity and Dental Research Institute School of DentistrySeoul National University 28 Yongon-Dong Chongno-Gu Seoul110-749 South Korea

AIM: To evaluate the pharmaceutical safety of a Chinese herbal formula, Chunggan extract (CGX), traditionally prescribed as a hepatotherapeutic drug via systemic acute and subacute toxicological study. METHODS: Twenty male dogs and 20 female dogs were fed doses 50 times and 4 times greater than the clinically-recommended drug dosages in an acute and a subacute toxicological study, respectively. Adverse effects were examined by comparing the differences between normal and drug-administered groups using clinical signs, necropsies, histopathologic findings, haematology, urinalysis, and biochemical analysis. RESULTS: In the acute study no change in the body weight, diarrhoea, apetite, mortality rate and histopa- thology of major organs was observed in male or female dogs with a single administration of CGX at 5 g/kg. No drug-induced abnormalities at analysis of histopathology, haematology, urinalysis, and biochemistry were found with any dose of this drug. CONCLUSION: CGX is supposed to be very safe when used in a clinical application with a wide therapeutic index.

关键词： Hepatotherapeutics Herbal remedy Chung-gan extract Safety Toxicological study

Removal of unexpected schwannoma with superficial parotidectomy using modified-Blair incision and superficial musculoaponeurotic system folding: A case report

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World Journal of Clinical Cases 2023年第18期11卷 4438-4445页

作者： Ha-Jong Nam hwan Jun choi Je-yeon Byeon Syeo-Young Wee Department of Plastic and Reconstructive Surgery Soonchunhyang University Gumi HospitalGumi-si 39371Gyeonsangbuk-doSouth Korea Department of Plastic and Reconstructive Surgery Soonchunhyang University Cheonan HospitalCheonan-si 31151Chungcheongnam-doSouth Korea

BACKGROUND When a firm facial mass in the cheek region is associated with a high index of clinical suspicion of its being of parotid gland origin,preventive parotidectomy is invariably *** report a rare case of a schwannoma that was suspected to be of parotid gland origin in a patient,who underwent successful surgical management using a modified-Blair incision and superficial musculoaponeurotic system(SMAS)layer folding *** SUMMARY A 27-year-old woman presented to the hospital for evaluation of a firm,fixed,non-tender mass(2.5 cm×3.5 cm),located anterior to the right ear,of 1 year’s ***-enhanced facial computed tomography revealed a wellencapsulated,low-density mass adherent to the superficial lobe of the right parotid gland,with a high index of clinical suspicion of an accessory parotid gland *** patient was scheduled to undergo resection of the mass and superficial *** underwent surgery using a modified-Blair incision,and the SMAS layer was folded posteriorly to reconstruct the *** examination confirmed the diagnosis of a schwannoma.,and we observed no postoperative complications such as hematoma,infection,or abnormal facial *** incision scar was unnoticeable 2 mo postoperatively,and the facial contour was maintained without any differences between the affected and unaffected *** We used a modified-Blair incision and SMAS layer folding method to achieve aesthetically good results following resection of a rare schwannoma with superficial parotidectomy in the cheek region.

关键词： Schwannoma Parotid gland Superficial musculoaponeurotic system Case report

Gene editing particle system as a therapeutic approach for drug-resistant colorectal cancer

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Nano Research 2020年第6期13卷 1576-1585页

作者： Jee-yeon Ryu You Jung choi Eun-Jeong Won Emmanuel Hui Ho-Shik Kim Young-Seok Cho Tae-Jong Yoon Laboratory of Nanopharmacy College of PharmacyResearch Institute of Pharmaceutical Science and Technology(RIPST)Ajou UniversitySuwon16499Republic of Korea Division of Gastroenterology Department of Internal MedicineSeoul St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul06591Republic of Korea Moogene Medi Co. Ltd.Seongnam13488Republic of Korea

The epidermal growth factor receptor(EGFR)pathway plays an important role in the progression of colorectal cancer(CRC).Anti-EGFR drugs based on antibodies have been widely used for treating CRC through inducing the cell death ***,the majority of CRC patients will inevitably develop drug-resistance during anti-EGFR drug treatment,which is mainly caused by a point mutation in the KRAS *** developed a nanoliposomal(NL)particle containing the Cas9 protein and a single-guide RNA(sgRNA)complex(Cas9-RNP),for genomic editing of the KRAS *** NL particle is composed of bio-compatible lipid compounds that can effectively encapsulate *** modifying the NL particle to include the appropriate antibody,it can specifically recognize EGFR expressing CRC and effectively deliver the gene-editing *** conditions of NL treatment were optimized using a KRAS mutated CRC in vivo mouse *** with KRAS-mutated CRC showed drug resistance against cetuximab,a therapeutic antibody *** treating the mice with the KRAS gene-editing NL particles,the implanted tumors showed a dramatic decrease in *** results demonstrated that this genomic editing complex has great potential as a therapeutic carrier system for the treatment of drug-resistant cancer caused by a point mutation.

关键词： nanoliposome clustered regularly interspaced short palindromic repeat and associated Cas9 nuclease(CRISPR/Cas9) KRAS mutation drug-resistance colorectal cancer

Effectiveness of out-fracture of the inferior turbinate with reduction nasal bone fracture

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世界临床病例杂志 2023年第27期11卷 6374-6382页

作者： Se-Young Kim Ha-Jong Nam Je-yeon Byeon hwan Jun choi Department of Plastic and Reconstructive Surgery Soonchunhyang University Gumi HospitalGumi-si 39371South Korea Department of Plastic and Reconstructive Surgery Soonchunhyang University Cheonan HospitalCheonan-si 31151South Korea

BACKGROUND The nasal bone,being the most protruding bone in the center of the facial bones,is particularly susceptible to *** bone fractures can often result in secondary deformation and dysfunction of the nose,including septal *** on functional or intra-nasal complications have been rarely reported after nasal bone fracture *** To evaluate the severity of nasal obstruction and its improvement following nasal bone fracture reduction using inferior *** We conducted a retrospective review of data from 50 patients with symptomatic nasal obstruction between January to December *** patients underwent preoperative Computed tomography evaluation,and symptom changes and nasal cavity volume were analyzed using a visual analog scale and acoustic rhinometry before and after *** reduction and out-fracture of both inferior turbinates performed by the same *** outcomes were assessed by comparing changes in the nasal airway volume measured using acoustic rhinometry before and after *** minimal cross-sectional area(MCA)was also analyzed based on the Stranc *** Before reduction,the mean MCA for all cases was 0.59±0.06 cm^(2),which represented an 11%decrease compared to the average size of a Korean adult(0.65±0.03 cm^(2)).The MCA for frontal impact was 0.60±0.02 cm^(2) and for lateral impact,it was 0.58±0.03 cm^(2).After reduction via inferior turbinoplasty,the MCA improved to 0.64±0.04 cm^(2).CONCLUSION This study suggests that turbinoplasty is helpful in addressing nasal ***-fracture of the inferior turbinate is an effective and durable technique that can be easily performed to enlarge the nasal airway with minimal morbidity.

关键词： Acoustic rhinometry Nasal bone Fracture Turbinate

稀土氧化物修饰的富勒烯-二氧化钛复合材料光催化降解亚甲基蓝(英文)

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催化学报 2011年第9期32卷 1457-1464页

作者： choi Jong-geun PARK Chong-yeon OH Won-chun Department of Advanced Materials Science & Engineering Hanseo University

Rare earth oxide-treated fullerene and titania composites (Y-fullerene/TiO2) were prepared by the sol-gel method. The products had interesting surface compositions. X-ray diffraction patterns of the composites showed that the Y-fullerene/TiO2 composites contained a single and clear anatase phase. The surface properties were observed by scanning electron microscopy, which gave a characterization of the texture on the Y-fullerene/TiO2 composites and showed a homogenous distribution of titanium particles. The energy-dispersive X-ray spectra showed the presence of C and Ti with strong Y peaks. The composite obtained was also characterized with transmission electron microscopy and UV-Vis spectroscopy. The photocatalytic results showed that the Y-fullerene/TiO2 composites had excellent activity for the degradation of methylene blue under visible light irradiation. This was attributed to both the effects on the photocatalysis of the supported TiO2 by charge transfer by the fullerene, and the introduction of yttrium to enhance photo-generated electron transfer.

关键词： fullerene yttrium titania visible light methylene blue

Hepatic artery pseudoaneurysm caused by acute idiopathic pancreatitis

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World Journal of Gastroenterology 2012年第18期18卷 2291-2294页

作者： yeon hwa Yu Joo Hyun Sohn Tae Yeob Kim Jae Yoon Jeong Dong Soo Han Yong Cheol Jeon Min Young Kim Department of Internal Medicine Hanyang University College of MedicineGuriGyunggi-Do 471-701South Korea Department of Radiology Hanyang University College of MedicineGuri 471-701South Korea

Hepatic artery pseudoaneurysm(HAP) is a very rare disease but in cases of complication,there is a very high *** most common cause of HAP is iatrogenic trauma such as liver biopsy,transhepatic biliary drainage,cholecystectomy and *** may also occur with complications such as infections or inflammation associated with septic *** has been reported rarely in patients with acute *** far as we are aware,there is no report of a case caused by acute idiopathic pancreatitis,*** report a case of HAP caused by acute idiopathic pancreatitis which developed in a 61-year-old *** woman initially presented with acute pancreatitis due to unknown *** conservative management,her symptoms seemed to have *** eight days after admission,abdominal pain abruptly became worse *** computed tomography(CT) was rechecked and it detected a new HAP that was not seen in a previous abdominal *** retrograde cholangiopancreatography(ERCP) was performed because of a suspicion of hemobilia as a cause of aggravated abdominal *** confirmed hemobilia by observing fresh blood clots at the opening of the ampulla and several filling defects in the distal common bile duct on *** any particular treatment such as embolization or surgical ligation,HAP thrombosed *** months after discharge,abdominal CT demonstrated that HAP in the left lateral segment had disappeared.

关键词： Hepatic artery Pseudoaneurysm Pancreatitis Acute Hemobilia