• 제목/요약/키워드: Bio-film

검색결과 441건 처리시간 0.026초

Preparation of Carrageenan-based Antimicrobial Films Incorporated With Sulfur Nanoparticles

  • Saedi, Shahab;Shokri, Mastaneh;Rhim, Jong-Whan
    • 한국포장학회지
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    • 제26권3호
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    • pp.125-131
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    • 2020
  • Carrageenan-based functional films were prepared by adding two different types of sulfur nanoparticles (SNP) synthesized from sodium thiosulfate (SNPSTS) and elemental sulfur (SNPES). The films were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction spectroscopy (XRD), and thermal gravimetric analysis (TGA). Also, film properties such as UV-visible light transmittance, water contact angle (WCA), water vapor permeability (WVP), mechanical properties, and antibacterial activity were evaluated. SNPs were uniformly dispersed in the carrageenan matrix to form flexible films. The addition of SNP significantly increased the film properties such as water vapor barrier and surface hydrophobicity but did not affect the mechanical properties. The carrageenan/SNP composite film showed some antibacterial activity against foodborne pathogenic bacteria, L. monocytogenes and E. coli.

벼 부산물을 함유한 생분해성 필름의 기계적 성질 및 분해 특성 (Bio-degradable Characteristics and Mechanical Properties of Mulching Films Containing Rice By-product)

  • 한상익;강항원;변대우;장기창;서우덕;나지은;김준영;최경진
    • 한국작물학회지
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    • 제56권2호
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    • pp.113-118
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    • 2011
  • 작물의 멀칭재배에 활용이 가능한 생분해성 필름의 개발과 이용가능성을 검토하고자 수행한 결과는 다음과 같다. 1. 천연고분자를 이용한 생분해가 가능한 필름의 제조를 위해 벼 부산물인 왕겨와 쌀겨를 이용하여 생분해성 필름을 제조하였다. 2. 천연고분자를 이용하여 개발된 생분해성 필름의 기계적인 특성은 기존 멀칭필름과 비교해서 신장율은 낮으나 인장강도는 2배 이상 강함을 보였다. 그리고 파열점 비교에서도 멸칭필름은 뚜렷한 파열점이 존재하고 그 이후에는 같은 힘을 주어도 계속 늘어난 반면, 생분해성 필름은 서서히 늘어나며 점차 힘을 증가시켜야 늘어나는 특성을 보였다. 3. 생분해성 필름에 대한 유해성분 용출시험에서 중금속 들이 검출되지 않았고, 국내 친환경 인증 기준이 정하는 생분해성 수지의 함량기준에 충족하였다. 4. 작물을 이용한 토양 분해력 시험에서도 3 개월 이후에 서 대부분 분해됨을 보여 일반 농업 현장에 적용이 가능할 것으로 사료된다.

Electrodeposition of AuPt Alloy Nanostructures on a Biotemplate with Hierarchically Assembled M13 Virus Film Used for Methanol Oxidation Reaction

  • Manivannan, Shanmugam;Seo, Yeji;Kim, Kyuwon
    • Journal of Electrochemical Science and Technology
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    • 제10권3호
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    • pp.284-293
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    • 2019
  • Herein, we report an electrode surface with a hierarchical assembly of wild-type M13 virus nanofibers (M13) to nucleate the AuPt alloy nanostructures by electrodeposition. M13 was pulled on the electrode surface to produce a virus film, and then a layer of sol-gel matrix (SSG) was wrapped over the surface to protect the film, thereby a bio-template was constructed. Blending of metal binding domains of M13 and amine groups of the SSG of the bio-template were effectively nucleate and directed the growth of nanostructures (NSs) such as Au, Pt and AuPt alloy onto the modified electrode surface by electrodeposition. An electrocatalytic activity of the modified electrode toward methanol oxidation in alkaline medium was investigated and found an enhanced mass activity ($534mA/mg_{Pt}$) relative to its controlled experiments. This bio-templated growth of NSs with precise composition could expedite the intention of new alloy materials with tuneable properties and will have efficacy in green energy, catalytic, and energy storage applications.

CEM BIO Film 피복시설의 환경특성이 풋고추 생육에 미치는 영향 (Effect of Greenhouse Environment Covered with CEM BIO Film on Green Pepper(Capsicum annuum L.) Growth)

  • 전희;권영삼;김현환;이시영
    • 한국생물환경조절학회:학술대회논문집
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    • 한국생물환경조절학회 1998년도 임시총회 및 학술논문발표요지
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    • pp.99-102
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    • 1998
  • 우리나라 윈예생산 시설의 피복에 사용되는 피복자재는 값이 싸고 설치가 쉬우며 비교적 광투과율이 높고 시설에 피복할 경우 긴밀도가 뛰어나 보온력이 우수한 플라스틱 필름이 99 % 이상을 차지하고 있다. 최근에 플라스틱 필름의 종류는 다양하게 발전하여 소재는 PE(polyethylene), EVA(ethylene vinylacetate), PVC(polyvinylchloride), 등의 연질필름과 PET(poly ethylene terephthalate) 그리고 ETFE(ethylene tetrafluoride ethylene) 등의 반경질핌름으로 되어 있다. (중략)

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마늘 재배시 생분해성 멀칭 필름 이용효과 (Effects of Biodegradable Mulching Film Application on Cultivation of Garlic)

  • 이재한;김목종;김홍림;곽용범;권준국;박경섭;최효길;벡조드
    • 생물환경조절학회지
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    • 제24권4호
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    • pp.326-332
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    • 2015
  • 난지형 마늘 재배시 잡초발생 억제와 친환경 방제기술을 개발하기 위하여 생분해성 필름을 이용한 멀칭재배효과를 구명하고자 수행하였다. 멀칭 필름의 투광률은 흑색 PE 필름은 1.1%, 녹색 PE 필름은 26.1%, 투명 PE 필름은 86.1%, 생분해성 필름은 75.4%로 흑색 PE 필름의 경우 대부분의 광이 투과되지 못하였지만 녹색 PE 필름은 일부 광이 투과되었고 생분해성 필름과 투명 PE 필름은 투광률이 높았다. 지온은 무멀칭구에 비해 멀칭구가 높았고 투명 PE 필름, 생분해성 필름이 가장 높게 나타났다. 초장과 구중에서도 지온이 높게 유지되었던 멀칭구가 높았고 투명 PE 필름, 생분해성 필름이 가장 높았다. 멀칭재료별 소실상태는 멀칭 7개월까지 비닐 및 부직포멀칭구는 외관상 크게 소실되는 것을 없었으나, 생분해필름은 멀칭 5개월 이후 필름표면에 가로로 미세한 줄이 나타났고 쉽게 찢어지는 것을 볼 수 있었다.

맥문동 뿌리줄기의 저장력 향상을 위한 기능성필름 활용 (Use of Functional Films for Storage of Seed Tuber in Liriope platyphylla)

  • 성은수;최재후;김희규;최승혁;김철중;이재근;유지혜;김나영;유창연
    • 한국약용작물학회지
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    • 제26권4호
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    • pp.296-301
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    • 2018
  • Background: The objective of this study was to investigate the effect of packaging material on the growth of rootstock of Liriope platyphylla. Methods and Results: This study examined the effects of two types of packaging material, LDPE (low density polyethylene) and functional film on the growth of the tubers of L. platyphylla, at $5^{\circ}C$. During the 16-weeks of storage period, the ratio of loss and decay of the tubers was examined at intervals of 4, 8, and 16 weeks to detect the quality of the plant. After 16 weeks of storage, the treated tubers were own. Subsequently, plant height and the number of leaves were recorded. The results revealed that functional film at $5^{\circ}C$ was the ideal material for the storage of L. platyphylla tubers. The rate of loss was the highest (57.42%) with a onion net and the lowest (22.12%) with a functional film. Similarly, the rate of tuber decay was highest (8.20%) using onion net and the least (4.60%) when the functional film was used. Conclusions: Thus, the use of the functional film proved to be the most effective in the storage of L. platyphylla tubers when compared with the LDPE.

파이프 비닐온실용 권취식 창개폐기의 개발 (Development of roll - up ventilation system for pipe- constructed plastic film greenhouse)

  • 이기명;박규식;김유일;김태홍
    • 생물환경조절학회지
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    • 제4권2호
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    • pp.232-239
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    • 1995
  • This study was carried out to get required torque data needed to design and develop a roll-up ventilation system in a pipe-constructed plastic film green-house. The results obtained from this study are as follows : 1. The required torques of a roll-up ventilation system in greenhouse are the functions of its length. The torques should multiplied by the conversion coefficients (2.0 in ceiling vent, 1.8 in side vent) in case of application. 2. In constructing pipe-constructed plastic film greenhouse, a shaft pipe is the largest essential element in roll - up shaft weight constitution which have an effect on the required torques. Therefore, the pipe should be light using nonferrous materials like aluminum alloy. 3. A planetary reduction ventilator of differential ring gear type is suitable for a roll-up ventilation system, because it can make high efficient reduction just using the first step shift.

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Highly Efficient, Flexible Thin Film Nanogenerator

  • 이건재
    • 한국재료학회:학술대회논문집
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    • 한국재료학회 2011년도 춘계학술발표대회
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    • pp.10.1-10.1
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    • 2011
  • Energy harvesting technologies converting external sources (such as thermal energy, vibration and mechanical energy from the nature sources of wind, waves or animal movements) into electrical energy is recently a highly demanding issue in the materials science community for making sustainable green environments. In particular, fabrication of usable nanogenerator attract the attention of many researchers because it can scavenge even the biomechanical energy inside the human body (such as heart beat, blood flow, muscle stretching, or eye blinking) by converging harvesting technology with implantable bio-devices. Herein, we describe procedure suitable for generating and printing a lead-free microstructured $BaTiO_3$ thin film nanogenerator on plastic substrates to overcome limitations appeared in conventional flexible ferroelectric devices. Flexible $BaTiO_3$ thin film nanogenerator was fabricated and the piezoelectric properties and mechanically stability of ferroelectric devices were characterized. From the results, we demonstrate the highly efficient and stable performance of $BaTiO_3$ thin film nanogenerator and the integration of bio-eco-compatible ferroelectric materials may enable innovative opportunities for artificial skin and energy harvesting system.

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폴리에틸렌 필름의 광가교에 의한 옥타데칸의 고정화 (Octadecane Fixation via Photocrosslinking of Polyethylene Film)

  • 윤득원;장진호
    • 한국염색가공학회지
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    • 제22권3호
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    • pp.214-219
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    • 2010
  • Polyethylene(PE) films were photocrosslinked by continuous UV irradiation. Benzophenone addition as low as 1wt% into the PE film increased the gel fraction up to 96%. The photocrosslinking was attributed to the recombination of PE radicals generated upon UV irradiation, which was enhanced by the hydrogen abstraction of the added benzophenone. Also the crossliked PE showed higher thermal stability and decreased crystallinity with increasing UV energy as shown by TGA, XRD and DSC analysis. It was also possible to fix 5.4% octadecane into PE by the photocrosslinking. The crosslinked PE film containing octadecane showed lower tensile strength and modulus coupled with higher extension compared to that without octadecane, which can be used as a new plasticizing method for the crosslinked PE film.