본 연구에서는 디벤조퓨란(dibenzofuran), 바이페닐(biphenyl), 7-브로모-1,1,1-트라이플루오로헵탄-2-온(7-Bromo- 1,1,1-trifluoroheptan-2-one)을 단량체로 사용하여 강산 촉매하에서 축합중합을 수행함으로써 가지형 구조의 이오노머 전구체 (BFBC7Br)를 합성하였다. 이후 4차 암모늄기로의 개질 반응을 통해 OH⁻ 이온 전달이 가능한 디벤조퓨란–바이페닐 기반 이 오노머(BFBN)를 제조하였다. 합성된 BFBN의 화학 구조, 분자량 및 열적 특성을 분석하였으며, 용액 캐스팅(solution casting) 공법을 이용하여 BFBN 막을 제조하고 그 수화 거동 특성을 평가하였다. 또한 기계적 물성과 이온전도도를 PiperION 막과 비교함으로써 구조적 차이에 따른 성능 특성을 분석하였다. 그 결과, BFBN 막은 PiperION 대비 유연한 알킬 측쇄의 도입으 로 인해 변형 수용성(연신율)이 향상되었으며, 가지형 구조가 형성하는 친수/소수 영역의 미세상 분리 효과로 인해 우수한 OH⁻ 이온 전도도를 나타내었다.

In recent years, the efficient and clean utilization of coal has been widely concerned by scholars at home and abroad. Despite the abundance of global coal resources, the deep utilization rate of coal is still insufficient. To address this challenge, it has been explored the development and preparation of coal-based high value-added carbonaceous materials. In the present study, a novel process was developed for the preparation of graphene using biphenyl sourced from low-rank coal. Using chemical vapor deposition (CVD) technology, it was successfully implemented for us to grow high-quality graphene on copper foils. The prepared graphene products were observed and characterized using Raman spectroscopy, optical microscopy and scanning electron microscopy techniques. The results of this research provide a new perspective for the utilization of low-rank coal resources.

본 연구에서는 Cholestery1 bipheny1 ester계열 화합물을 합성하여 편광현미경이 부착된 hot-stage와 시차열분석기로 물성을 조사하였다. 이 계열 화합물들은 모두 콜레스테릭 액정상을 나타내며, 알콕시 사슬 3번부터 스메틱상이 형성됨을 보여 준다. 또한, 일반적인 콜레스테릭 액정화합물에 비해 높은 상전이 온도를 보유하고 있으며, 넓은 온도 범위에 걸쳐 액정상을 나타낸다.

Three biphenyl-degrading microorganisms were isolated from polluted soil samples in Sasang-gu, Busan. Among them, isolate DS-94 showing the strong degrading activity was selected. The morphological, physiological, and biochemical characteristics of DS-94 were investigated by API 20NE and other tests. This bacterium was identified as the genus Pseudomonas by 16S rDNA sequencing and designated as Pseudomonas sp. DS-94. The optimum temperature and pH for the growth of Pseudomonas sp. DS-94 were 25℃ and pH 7.0, respectively. This isolate could utilize biphenyl as sole source of carbon and energy. Biphenyl-degrading efficiency of this isolate was measured by HPLC analysis. As a result of biological biphenyl-degradation at high biphenyl concentration (500 mg/L), biphenyl-removal efficiency by this isolate was 73.5% for 7 days.

In an effort to uncover the spermatogenic impairment by the polychlorinated biphenyls (PCBs), the expression of tight junctions (TJs) genes important for the formation of the blood testis barrier (BTB) were examined following the 3,3',4,4',5-pentachloro biphenyl (PCB126) treatment in cultured neonatal testis in mice. At 4 days (D4) after 10 and 100 nM PCB126 treatment the expression of claudin-11 was significantly increased when compared with vehicle control. In contrast no difference in occludin and claudin-1 expression was found among the experimental group. On D8, 100 nM PCB126 significantly increased the expression of claudin-11 but not occludin and claudin-1. 1 uM PCB126 treatment significantly decreased expressions of occludin and ciaudin -1, suggesting the general toxic effect on the Sertoli cell. Because PCB126 does not alter the proliferative activity of spermatogenic cells and Sertoli cells in neonatal testis, it is likely that increase in the expression of claudin-11 by low dose of PCB126 may attribute to the alteration of the Sertoli cells differentiation in testis. It also emphasized that PCB126 might have differentially affected the transcription of TJ genes in Sertoli cells. In conclusion, this result suggests that the structure of TJ may be targeted by PCB126 in neonatal testis in mice and that co-PCB is potentially harmful to spermatogenesis by alteration of the development of BTB.