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대구가톨릭대학교 자연과학연구소> 자연과학연구논문집> 그래핀을 이용한 레졸형 접착제의 접착강도 향상

그래핀을 이용한 레졸형 접착제의 접착강도 향상

Enhanced adhesion strength of resol-based adhesive by incorporating graphene

백건욱 ( Baek Geon Wook ) , 한윤수 ( Han Yoon Soo )
  • : 대구가톨릭대학교 자연과학연구소
  • : 자연과학연구논문집 17권1호
  • : 연속간행물
  • : 2019년 12월
  • : 17-24(8pages)

DOI


목차

Ⅰ. 서론
Ⅱ. 실험
Ⅲ. 결과 및 고찰
Ⅳ. 결론
Ⅴ. 감사의 글
참고문헌

키워드 보기


초록 보기


						
For successful fabrication of graphene-reinforced adhesives, the specific surface modification of graphene was key issues to provide better dispersion of graphene and to obtain a higher adhesion by chemical bonding between the polymer matrix and the graphene particles. The surface hydroxyl groups of the as-received graphenes were modified via hydrolysis of N- (3-trimethoxysilyl propyl) - 4 - hydroxy butylamide as a surface modifier to create reactive methylol groups on the surface of graphene. Resol-type adhesives reinforced with methylolated graphenes were prepared and evaluated. As a result, the methylolated graphene was found to be effective in providing a higher adhesion strength and thermal stability of the adhesives, due to chemical grafting to resol resin.

UCI(KEPA)

간행물정보

  • : 자연과학분야  > 기타(자연과학)
  • :
  • :
  • : 연간
  • : 2093-8624
  • :
  • : 학술지
  • : 연속간행물
  • : 2003-2019
  • : 340


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발행기관 최신논문
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1총잔류산화물(TRO, Total Residual Oxidant) 중화를 위한 최적 조건 도출

저자 : 김동석 ( Kim Dong-seog ) , 박영식 ( Park Young-seek )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 1-6 (6 pages)

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(기관인증 필요)

초록보기

In order to treat microorganisms in ballast water, inert or active materials are mainly used. Processes using active substances remain active substances after treatment. TRO is a generic term for active substances such as these types of oxidants. Due to the convenience of measurement and the stability of equipment, ballast water treatment systems are mainly controlled by TRO values. This study investigated the effects of thiosulfate concentrations and Ca and Mg ions on the neutralization capacity of thiosulfate as a TRO neutralizer. The sodium thiosulfate concentration at the salinity of 32 PSU was found to be 4 mg/L for the 10 mg/L of TRO produced with NaOCl. At 32 PSU, Ma and Ca did not appear to affect residual TRO concentrations.

2Needle Trap Device를 이용한 날숨 (Breath) 분석에서의 artefacts

저자 : 김라윤 ( Kim Ra Yun ) , 엄인용 ( Eom In-yong )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 7-10 (4 pages)

다운로드

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초록보기

Breath volatile organic compounds (VOCs) can be used as non-invasive markers for disease. We intended to use needle trap device (NTD) as a sampling device to collect breath and then to analyze VOCs in breath by the gas chromatograph - mas s spectrometer (GC-MS). However, we realized many artefacts came from sampling tools related to this experiment. In the beginning, we wanted to use a storage system using tedlar bag but artefacts such as phenol was discovered and we change method of using glass syringe and syringe pump to adsorb to NTD just after sampling. Other than that, investigate artefacts by hand and adsorbent, and breath of smoker (Isoprene ↑, toluene, smell of tobacco) and nonsmoker (Isoprene, p-ethyl benzaldehyde) was analyzed and compared.

3우사 작업자들의 세포면역력 분석

저자 : 김창열 ( Chang-yul Kim ) , 송은섭 ( Eun-seob Song ) , 신소정 ( So-jung Shin ) , 조지훈 ( Ji-hun Jo ) , Ravi Gautam , 이재희 ( Jae-hee Lee ) , 양수정 ( Su-jeong Yang ) , 김형아 ( Hyoung-ah Kim ) , 허용 ( Yong Heo )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 11-16 (6 pages)

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Endotoxin in dust generated at agricultural environments is known to contribute to occurrence of farmer's lung. Iimmunological markers related with respiratory allergy was evaluated for bovine husbandry workers, and compared with the age-sex matched non - agricultural subjects. Peripheral bloods were collected from 6 workers at 3 bovine farms, and 14 control subjects. Peripheral mononuclear cells were stimulated with phorbol 12-myristate 13-acetate and ionomycin for 72 hours. Level of various cytokines produced at culture supernatants was determined using commercially available ELISA kit. Plasma levels of IgE and IgG subclass were determined. Concentration of inhalable and respirable particulate matter in indoor of the bovine farms was evaluated, and endotoxin level in the dust was measured by Limulus Amebocyte Lysate Kinetic QCL method. Level of endotoxin in the inhalable dust was approximately 154 EU/m3, and 9 EU/m3 in the respirable dust. Plasma IgG4 level, a humoral indicator for allergic propensity, was higher in the milk cow farmers tan the control. Ratio (interferon - γ vs interleukin-4 or intrleukin-13), indicating immunologic skewedness against allergic reactivities, was lower at the milk cow workers compared with those of control subjects. Even though sufficient number of bovine husbandry workers and farms were not investigated, this study suggests in general that immunological function of milk cow farm workers exposed to high level of endotoxin could be modulated toward allergic reactivities.

4그래핀을 이용한 레졸형 접착제의 접착강도 향상

저자 : 백건욱 ( Baek Geon Wook ) , 한윤수 ( Han Yoon Soo )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 17-24 (8 pages)

다운로드

(기관인증 필요)

초록보기

For successful fabrication of graphene-reinforced adhesives, the specific surface modification of graphene was key issues to provide better dispersion of graphene and to obtain a higher adhesion by chemical bonding between the polymer matrix and the graphene particles. The surface hydroxyl groups of the as-received graphenes were modified via hydrolysis of N- (3-trimethoxysilyl propyl) - 4 - hydroxy butylamide as a surface modifier to create reactive methylol groups on the surface of graphene. Resol-type adhesives reinforced with methylolated graphenes were prepared and evaluated. As a result, the methylolated graphene was found to be effective in providing a higher adhesion strength and thermal stability of the adhesives, due to chemical grafting to resol resin.

5과수 작물과 하우스 작물 재배의 산업보건학적 현황 조사

저자 : 송영웅 ( Song Young-woong )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 25-29 (5 pages)

다운로드

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초록보기

This study investigated the work load of each farm-work process, occupational health related problem situation, perceived fatigue symptoms, and body parts with musculoskeletal disorders symptom for fruit crop farmers (n=27) and vinyl house seed farmers(n=44). Results showed that for vinyl house work, the workload of cultivating process showed the highest stress, while pollination/thinning out and crop during process induced high workload for fruit crop farming. Eduction about the preventive method of toxic gas/dust/vibration/noise was not conducted for 88% of the respondents. Perceived fatigue results showed that the house seed farmers was 39% which was higher than the fruit crop farmers(20%). Forty four percentage of fruit crop farmers showed musculoskeletal symptoms (pain, ache) in the shoulder, and 37% for hand/wrist, and 26% for the knee. However, the house seed farmers showed MSDs symptoms the highest percentage in the knee(59%), and low back(50%), hand/wrist(39%), shoulder(34%). These results indicate that there is a quite big difference between the fruit crop and house seed farmers in the aspect of workload for each farming step, occupational health control practices, perceived fatigue, and body parts with MSDs symptoms. Thus, nationwise scale survey for different crops, farming methods should be conducted to understand and prevent the health related problems of the farmers.

6청각 프로세스의 심리물리학적 진단

저자 : 이지영 ( Ji Young Lee )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 31-34 (4 pages)

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(기관인증 필요)

초록보기

(Central) auditory processing disorder ((C)APD) is a perceptual disorder thought to result from the neurological problem that affects auditory process. To diagnose the (C)APD as a definite disorder differently from the other related disorders, a variety of psychoophysical and electophysiological tests have been developed. Of them, the present paper aims to examine the principle and procedure of psychoophysical tests currently used for localization/lateralization, auditory discrimination, temporal processing, dichotic listening, and monaural low-redundancy speech perception as essential areas of auditory processing. It needs to develop more additional tests to establish the diagnosis and management of (C)APD effectively on the multidisciplinary approach.

7[1,2,4]-Triazole 유도체의 합성

저자 : 이지훈 ( Ji-hoon Lee ) , 이상협 ( Sang-hyeup Lee )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 35-39 (5 pages)

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초록보기

A series of N-(4-(2-(2-(2-(2 -mercaptoethoxy)ethoxy)ethoxy)ethoxy)phenyl)-2-((4- phenyl - 5 - (pyridin - 2 - y 1) - 4H -1,2,4 - triazol - 3 - y 1) thio) acetamideand their analogues were synthesized.

8미생물 성장에 따른 Alexandrium catenella와 Chattonella marina에 대한 살조활성의 관계

저자 : 정성윤 ( Seong-yun Jeong )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 41-45 (5 pages)

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In order to exploit the novel algicidal bacteria as a useful biological agent against harmful algal blooms (HABs), marine bacterial strain was isolated. The inhibitory effect for the growth of HAB species was examined. The isolated strain DC-31 exhibited significant algicidal activity against HAB species, Alexandrium catenella and Chattonella marina. The isolated algicidal bacterium was identified as Janibacter sp. The algicidal activity of the isolate was bacterial growth-dependent, since the strongest algicidal activity occurred in early stationary-phase cultures. A concentration of < 5% showed strong algicidal activity against A. catenella and C. marina. These results indicates that the algicidal activity of DC-31 is potentially useful in controlling HABs. In addition, it was demonstrated that the filtrate of DC-31 were very effective at killing or inhibiting of HAB species.

9대두 유래 genistein의 투여와 불안 조절 및 수면 유도 효과의 평가

저자 : 제현동 ( Je Hyun Dong )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 47-51 (5 pages)

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In this study, we investigated the possible influence and related mechanisms that have yet to be clearly demonstrated of Glycine max derived-genistein on the antianxiety or anesthesia. Genistein (5,7- Dihydroxy - 3 - (4 - hydroxy phenyl) chromen - 4 - one) which exert protective effects on the cardiovascular system through mechanisms that have yet to be clearly demonstrated, is a hydroxylated isoflavone, a type of flavonoids found in Glycine max (Fabaceae). However, there are no reports on the antianxiety or hypnotic properties of genistein, the primary ingredient of Glycine max. We hypothesized that genistein plays a role in the modulation of insomnia or anxiery evoked by elevated plus maze. Male Institute of Cancer Research mice were used and the duration of sleep, duration and entry frequency into open arms were measured and recorded. The present study was carried out to evaluate the antianxiety and hypnotic effects of genistein. The administration of genistein (30 and 100 mg/kg) increased b arbitur ate - induced sleep suggesting the activation of GABAA receptor. It also increased the duration and entry frequency into open arms in the maze. In conclusion, genistein has hypnotic and antianxiety properties and is a potential therapeutic for anxiety and insomnia.

10축열식과 비축열식 바닥복사난방의 실내 열환경 특성 비교

저자 : 최동호 ( Choi Dong-ho )

발행기관 : 대구가톨릭대학교 자연과학연구소 간행물 : 자연과학연구논문집 17권 1호 발행 연도 : 2019 페이지 : pp. 53-63 (11 pages)

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This paper examines the characteristics of thermal storage floor heating system and compares the heating characteristics of thermal and non-thermal storage floor heating systems through field experiments. In addition, the heating energy consumption of the two heating systems were measured and used as the basis for performance evaluation. Our results are as follows: ① The two floor radiant heating systems showed extremely uniform temperature regardless of location and height of the indoor space, which effectively improved the thermal comfort of the room. ② Non-thermal storage floor heating systems were found to elicit relatively fast thermal responses and were thus effective for intermittent heating that requires a fast thermal response. ③ It was confirmed that the longer the heating operation time and the higher the set temperature of water, the higher the indoor globe temperature rose. ④ The initial long-wave radiation of non-thermal storage floor heating systems, which exhibits a relatively rapid rise of the bottom surface temperature, was high, but subsequently thermal storage floor heating systems showed higher long-wave radiation than that of non-thermal storage floor heating. ⑤ In this comparative experiment, non-thermal storage floor heating required only 27% of energy compared to its thermal storage counterpart.

12
주제별 간행물
간행물명 수록권호

KCI등재

한국과학사학회지
42권 1호 ~ 42권 1호

KCI등재

대한원격탐사학회지
36권 2호 ~ 36권 2호

KCI등재

대한임상검사과학회지 (Korean Journal of Clinical Laboratory Science)
52권 1호 ~ 52권 1호

KCI등재

대한원격탐사학회지
36권 1호 ~ 36권 1호

충남과학연구지
36권 1호 ~ 36권 1호

KCI등재

대한임상검사과학회지 (Korean Journal of Clinical Laboratory Science)
51권 4호 ~ 51권 4호

KCI등재

한국환경과학회지
28권 12호 ~ 28권 12호

KCI등재

대한원격탐사학회지
35권 6호 ~ 35권 6호

KCI등재

한국과학사학회지
41권 3호 ~ 41권 3호

자연과학연구논문집
17권 1호 ~ 17권 1호

KCI등재

한국환경과학회지
28권 11호 ~ 28권 11호

KCI등재

대한원격탐사학회지
35권 5호 ~ 35권 5호

KCI등재

한국과학사학회지
39권 2호 ~ 39권 2호

KCI등재

한국환경과학회지
28권 10호 ~ 28권 10호

KCI등재

한국환경과학회지
28권 9호 ~ 28권 9호

KCI등재

대한임상검사과학회지 (Korean Journal of Clinical Laboratory Science)
51권 3호 ~ 51권 3호

KCI등재

한국과학사학회지
41권 2호 ~ 41권 2호

KCI등재

한국환경과학회지
28권 8호 ~ 28권 8호

KCI등재

대한원격탐사학회지
35권 4호 ~ 35권 4호

KCI등재

한국환경과학회지
28권 7호 ~ 28권 7호
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