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Strength dependence of epoxy composites on the average filler size of non-oxidized graphene flake
Kim, Jin,Kim, Jungmo,Song, Sungho,Zhang, Shuye,Cha, Jaemin,Kim, Kisun,Yoon, Hyewon,Jung, Yeonwoong,Paik, Kyung-Wook,Jeon, Seokwoo Elsevier 2017 Carbon Vol.113 No.-
<P>Enhancing the filler-to-matrix contact area by incorporating large graphene flakes (GFs) is considered a viable approach for improving the mechanical properties of polymer composites. Graphene oxide (GO) flakes have been initially pursued for this application owing to the advantage of producing large-sized GFs. However, the defective nature of GO makes it technically challenging to precisely assess their dimensional effect on resulting mechanical properties, limiting their versatility as reinforcing materials. Therefore, it is highly desired to fabricate GFs with minimum defects and large lateral size. In this paper, we report the fabrication of high-quality edge functionalized non-oxidized graphene flakes (f-NOGFs) by the liquid exfoliation of graphite intercalation compounds. As-prepared f-NOGFs are over 1 mu m in lateral size and contain less than 6.25% of impurity oxygen. By using size-sorted f-NOGFs, we systematically studied the relationship between mechanical properties and lateral sizes in f-NOGFs-incorporated epoxies. We identify that epoxy composites containing 0.6 wt% of f-NOGFs with a lateral size of 1 mu m present outstanding mechanical properties; elastic modulus of 3.65 GPa, ultimate tensile strength of 95.74 GPa and toughness of 2.52 Mj m(-3). The study presented in this paper could provide better understanding for optimization of the mechanical reinforcement of graphene-polymer composites. (C) 2016 Elsevier Ltd. All rights reserved.</P>
A case of keratoacanthoma successfully treated with intralesional methotrexate
( Joongoon Kim ),( Moonhyung You ),( Yeonwoong Kim ),( Byeongsu Kim ),( Donghoon Shin ),( Jongsoo Choi ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Solitary keratoacanthoma is a rather common, rapidly growing neoplasm appearing mainly on sun-exposed areas of the skin in elderly, light-complexioned person. The majority of these lesions occur on the face, forearms, and hands. It is thought that intralesional methotrexate is effective as nonsurgical treatment of keratoacanthoma. A 85-year-old female presented with history of a rapidly growing 1.5cm-sized mass on the right submandible for 2 months. Histopathologic examination showed eosinophilic and glassy cell within shell and resulted in diagnosis of keratoacanthoma. We performed methotrexate injection with 0.1cc (50mg/2cc) each, four times in a row, with an interval of 3 weeks between inspections. After 6 weeks of treatment, the skin lesion had almost completely resolved. We report a case of keratoacanthoma which was successfully treated by intralesional methotrexate. Intralesional methotrexate can promote rapid improvement so in patient with cosmetic concern, we recommend intralesional methotrexate as nonsurgical treatment of keratoacanthoma.
A case of tumid lupus erythematous following Kikuchi`s disease
( Joongoon Kim ),( Moonhyung You ),( Yeonwoong Kim ),( Byeongsu Kim ),( Donghoon Shin ),( Jongsoo Choi ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Tumid lupus erythematosus is a rare subtype of chronic cutaneous lupus erythematosus. Clinical lesions are characterized by raised erythematous plaques on sun-exposed areas such as the face, chest, arms and shoulders. Kikuchi’s disease is commonly associated with systemic lupus erythematosus, but rarely associated with tumid lupus erythematosus. A 36-year-old female patient presented with multiple erythematous plaques on both cheeks and back. She was diagnosed as Kikuchi’s disease by lymph node biopsy 3 month ago. ANA was negative, and histopathologic examination showed little vacuolar alteration, periadnexal, perivascular lymphocytic infiltration at dermo-epidermal junction. Mucin deposition in the reticular dermis was identified by alcian blue stain, so we diagnosed as tumid lupus erythematosus. After treatment with oral hydrochloroquine 100mg daily, the skin lesion was improved significantly. Herein, when skin lesion developed in patient with Kikuchi’s disease, we recommend skin biopsy to identify whether the skin lesion is from Kikuchi’s disease or other associated diseases.
Subcutaneous wood stick found by Leclercia adecarboxylata infection
( Joongoon Kim ),( Moonhyung You ),( Yeonwoong Kim ),( Byeongsu Kim ),( Donghoon Shin ),( Jongsoo Choi ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Leclercia adecarboxylata is gram-negative, motile, facultative anaerobic bacillus of the En-terobacteriaceae family. It has been rarely isolated from clinical specimens. A 15-year-old boy presented with two nodules on the left lower leg. He said that the first nodule emerged presumably following an injury about 2 years ago, and the second one emerged about 6 months ago. A week before visiting hospital, he felt pain on both nodules. We performed incision & drainage, bacterial culture on the first nodule, and skin biopsy on the second one. During incision & biopsy, we found an approximately 4cm-long wood stick. Histopathologic examination showed foreign body granuloma and Leclercia adecarboxylata was isolated from the bacterial culture. We report an interesting case of the skin lesion following wood stick injury, which was asymptomatic during last 2 years and later diagnosed as Leclercia adecarboxylata infection.
A case of green nail syndrome with onychomycosis
( Joongoon Kim ),( Moonhyung You ),( Yeonwoong Kim ),( Byeongsu Kim ),( Donghoon Shin ),( Jongsoo Choi ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Green nail syndrome is characterized by greenish discoloration of the nail. It is caused by Pseudomonas aeruginosa which is an aerobic gram-negative rod found in moist environment. Trauma of the nail and exposure to water are common predisposing factors of green nail syndrome. A 66-year-old woman developed an asymptomatic greenish discoloration of the nail plate of the right great finger nail over a period of 20 days. Dermatologic examination showed onycholysis and many hyphae were seen in KOH examination. Pseudomonas aeruginosa was identified by bacterial culture and susceptible to ciprofloxacin. We prescribed oral ciprofloxacin, oral terbinafine and topical hexamedine. Three weeks later, the nail discoloration was improved significantly. Detailed medical history should be obtained because green nail syndrome often can be developed following trauma, periungal infection and inflammatory skin disease. In case of the green nail syndrome with onychomycosis, identifying causative organism is necessary to choose appropriate treatment.
A case of folliculotropic mycosis fungoides
( Joongoon Kim ),( Moonhyung You ),( Yeonwoong Kim ),( Byeongsu Kim ),( Donghoon Shin ),( Jongsoo Choi ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Mycosis fungoides is the most common form of cutaneous T-cell lymphoma, and it rarely exhibits predilection for hair follicle and eccrine gland infiltration. Folliculotropic mycosis fungoides is a distinct variant of mycosis fungoides. It is characterized by tropism of the lymphocytic infiltrate for hair follicle and other adnexal structure. Two cases of folliculotropic mycosis fungoides have been reported in Korean dermatologic literature. A 68-year-old male presented with a single recurring nodule on the left chin for 3 years. Histopathologic examination showed folliculotropism of atypical lymphocytes and immunohistochemical stain showed positivity for CD3, negativity for CD20 and elevated CD4: CD8 ratio (6:1). These findings correspond to folliculotropic mycosis fungoides’s histopathologic finding. We report an interesting case of folliculotropic mycosis mimicking acne or folliculitis-like lesion and recommend biopsy when skin lesion is persistant despite long term therapy.