• 제목/요약/키워드: engineered surface

검색결과 130건 처리시간 0.026초

바이오미미크리 특성이 적용된 신재료 가공방법 연구 (A Study on Processing Methods of New Materials Applied to Biomimicry Characteristics)

  • 지주연;서지은
    • 한국실내디자인학회논문집
    • /
    • 제22권5호
    • /
    • pp.367-375
    • /
    • 2013
  • Using the 'New material' concept has recently been introduced into the natural characteristics. In the course of such a, Janine M. Benyus has proposed to mimic the characteristics of natural ecosystems to mention the concept of Biomimicry. Process made engineered using technical elements for representing the material properties of Biomimicry such will be acting importantly, This study intends to analyze how new materials applied to 'Biomimicry' characteristics are processed in space. The results were as follows : 1) Processing methods of new materials resulted as 'Forming', 'Surface treatment', 'Bonding', 'Inserting'. These four were divided and analyzed into 'Form', 'System', 'Adaptation'. As a result of this analysis, such significances were shown as 'Forming/Surface treatment/Bonding' in 'Form', 'Bonding' in 'System' and 'Adaptation'. 2) 'Bonding' applied to 'System' of new material can be recycled to be combined with other materials through the existing adhesive material, and present as a solution of 'Sustainable development'. 3) 'Bonding' applied to 'Adaptation' of new material is to impart the ability to react to the environment through the joint, but is characteristic, at this time, using digital and other field technology. It appeared primarily that it can be known to meet the social trends and convergence between fields. Thus, as the finish that are friendly to the environment from the interior design, the results of the study are expected to be utilized in the study of new materials guidelines.

Biomimetically Engineered Polymeric Surfaces for Micro-scale Tribology

  • Singh R. Arvind;Kim Hong-Joon;Kong Ho-Sung;Yoon Eui-Sung
    • KSTLE International Journal
    • /
    • 제7권1호
    • /
    • pp.14-17
    • /
    • 2006
  • In this paper, we report on the replication of surface topography of natural leaf of Lotus onto thin polymeric films using a capillarity-directed soft lithographic technique. PDMS molds were used to replicate the surface. The replication was carried out on poly(methyl methacrylate) (PMMA) film coated on silicon wafer. The patterns so obtained were investigated for their friction properties at micro-scale using a ball-on-flat type micro-tribo tester, under reciprocating motion. Soda lime balls (1 mm diameter) were used as counterface sliders. Friction tests were conducted at a constant applied normal load of $3000{\mu}N$ and speed of 1mm/s. All experiments were conducted at ambient temperature ($24{\pm}1^{\circ}C$) and relative humidity ($45{\pm}5%$). Results showed that the patterned samples exhibited superior tribological properties when compared to the silicon wafer and non patterned sample (PMMA thin film). The reduced real area of contact projected by the surfaces was the main reason for their enhanced friction property.

Engineered biochar from pine wood: Characterization and potential application for removal of sulfamethoxazole in water

  • Jang, Hyun Min;Yoo, Seunghyun;Park, Sunkyu;Kan, Eunsung
    • Environmental Engineering Research
    • /
    • 제24권4호
    • /
    • pp.608-617
    • /
    • 2019
  • The adsorption of sulfamethoxazole (SMX) onto a NaOH-activated pine wood-derived biochar was investigated via batch experiments and models. Surprisingly, the maximum adsorption capacity of activated biochar for SMX (397.29 mg/g) was superior than those of pristine biochars from various feedstock, but comparable to those of commercially available activated carbons. Elovich kinetic and Freundlich isotherm models revealed the best fitted ones for the adsorption of SMX onto the activated biochar indicating chemisorptive interaction occurred on surface of the activated biochar. In addition, the intraparticle diffusion limitation was thought to be the major barrier for the adsorption of SMX on the activated biochar. The main mechanisms for the activated biochar would include hydrophobic, π-π interactions and hydrogen bonding. This was consistent with the changes in physicochemical properties of the activated biochar (e.g., increase in sp2 and surface area, but decrease in the ratios of O/C and H/C).

Electrospun Metal Oxide Composite Nanofibers Gas Sensors: A Review

  • Abideen, Zain Ul;Kim, Jae-Hun;Lee, Jae-Hyoung;Kim, Jin-Young;Mirzaei, Ali;Kim, Hyoun Woo;Kim, Sang Sub
    • 한국세라믹학회지
    • /
    • 제54권5호
    • /
    • pp.366-379
    • /
    • 2017
  • Nanostructured materials have attracted considerable research interest over the recent decades because of their potential applications in nanoengineering and nanotechnology. On the other hand, the developments in nanotechnology are strongly dependent on the availability of new materials with novel and engineered morphologies. Among the novel nanomaterials reported thus far, composite nanofibers (NFs) have attracted considerable attention in recent years. In particular, metal oxide NFs have great potential for the development of gas sensors. Highly sensitive and selective gas sensors can be developed by using composite NFs owing to their large surface area and abundance of grain boundaries. In composite NFs, gas sensing properties can be enhanced greatly by tailoring the conduction channel and surface properties by compositional modifications using the synergistic effects of different materials and forming heterointerfaces. This review focuses on the gas sensing properties of composite NFs synthesized by an electrospinning (ES) method. The synthesis of the composite NFs by the ES method and the sensing mechanisms involved in different types of composite NFs are presented along with the future perspectives of composite NFs.

나노허니컴 구조물을 이용한 산업용 극소수성 표면 제작 (Superhydrophobic Engineered Surface Based on Nanohoneycomb Structures)

  • 김동현;박현철;이건홍;황운봉
    • Composites Research
    • /
    • 제20권2호
    • /
    • pp.17-20
    • /
    • 2007
  • Oxalic acid를 이용한 양극산화기법과 테플론 담금법을 이용하여 극소수성 나노/마이크로 구조물을 복제하였다. 이때 nanoscale hole의 사이즈는 양극산화시의 전압과 양극산화시간에 의해 결정된다. nanoscale에서 분자들 사이에 영향을 미치는 Van der Waals interactions에 의해서 복제 중 polymer sticking 현상이 발생한다. 이는 복제된 나노 구조물들이 서로 들러붙고 구부러지고 침강시키는 작용을 하게 된다. 이러한 현상이 microstructures위에 nanostructures가 존재하는 hierarchical structure가 생성되게 하며, 이러한 구조물은 연꽃잎의 미세구조물과 유사한 특성을 보인다. 즉 제작된 극소수성 나노/마이크로 구조물 표면은 접촉각이 $160^{\circ}{\sim}170^{\circ}$정도로 나타내고 또한 $1^{\circ}$미만의 sliding angle을 나타낸다.

Numerical Simulation of Rainfall Infiltration Into Disposal Cover of Performance Test Facility

  • Mijin Kwon;Seho Choi;Chunhyung Cho
    • 방사성폐기물학회지
    • /
    • 제22권2호
    • /
    • pp.185-199
    • /
    • 2024
  • Disposal cover as an engineered barrier of a near-surface disposal facility for low and very low-level radioactive waste is composed of a multi-layer to isolate radioactive waste from environmental influences for the long term. To acquire a realistic forecast for the post-closure period of the disposal facility, it is essential to carry out long-term experimental research in a similar condition to the actual disposal environment. Hence, a performance test facility of the disposal cover was constructed in Gyeongju low and intermediate level radioactive waste disposal center in 2022. The constructed performance test facility has differences from the material properties presented in the design. These differences are factors that affect the prevent rainfall infiltration, which is one of the important roles of the disposal cover. Therefore, in this study, a numerical simulation of rainfall infiltration into the performance test facility was performed for the designed case and the actual constructed case. To simulate the behavior of water infiltration, the FEFLOW software based on the finite element method is used. Through the analysis of numerical simulation results, it is confirmed that the hydraulic conductivity of the material constituting the multi-layer of the disposal cover greatly influences the amount of water infiltration.

THE IMPACT OF ENVIRONMENT ON DIMENSIONAL REPRODUCIBILITY OF POLYESTER FILM DURING FLEXIBLE ELECTRONICS PROCESSING

  • MacDonald, W.A.;Looney, M.K.;Adam, R.;Eveson, R.;MacKerron, D.;Rollins, K.;Rustin, R.;Hashimoto, K.
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
    • /
    • pp.637-640
    • /
    • 2006
  • DuPont Teijin Films (DTF) have developed engineered substrates specifically for the flexible electronics market. $Teonex^{(R)}Q65$ is a biaxially oriented crystalline polyester with a tailored surface and it is emerging as a competitive material for the base substrate in OLED displays and active matrix backplanes. Given the dimensional reproducibility requirements in the display applications, uncontrolled moisture absorption during the processing cycle could potentially be far more significant than the inherent shrinkage of the base substrate. Understanding these effects and optimising the processing steps involved in device manufacture will be critical to achieving the ultimate performance that can be achieved with the base substrate.

  • PDF

툴링볼을 이용한 측정 및 레지스트레이션 방법 개발 (Developent of Scanning and Registration Methods Using Tooling Balls)

  • 김용환;윤정호;이관행
    • 한국CDE학회논문집
    • /
    • 제4권1호
    • /
    • pp.60-68
    • /
    • 1999
  • In reverse engineering (RE) sustems, the quality of the data aquisition process is crucial to the accuracy of the reverse engineered three dimensional computer-aided design (CAD) model. However, these tasks are predominantly done manually, and little work has been done to improve the efficiency of scanning by determining the minimum number of scans and the optimal scanning directions. In this paper, new scanning and registration methods using tooling balls are developed to assist in determining the optimal parameter for these processes. When the object to scanned has no concavity, attaching path of the object and its bounding rectangle are used for optimal scanning and registration. Then minimum number of tooling balls and their positions are calculated automatically. In the case of concave parts, the scanning plan should include a complete scan of the concave area. With the surface normal vector and the scanning direction, the minimum degree of rotating the part can be calculated. But the maximum rotation should be restricted in order to prevent occlusion of the part. Finally tow sample part ar scanned based on the proposed methods and the results are discussed.

  • PDF

AN ANALYSIS OF THE FACTORS AFFECTING THE HYDRAULIC CONDUCTIVITY AND SWELLING PRESSURE OF KYUNGJU CA-BENTONITE FOR USE AS A CLAY-BASED SEALING MATERIAL FOR A HIGH-LEVEL WASTE REPOSITORY

  • Cho, Won-Jin;Lee, Jae-Owan;Kwon, Sang-Ki
    • Nuclear Engineering and Technology
    • /
    • 제44권1호
    • /
    • pp.89-102
    • /
    • 2012
  • The buffer and backfill are important components of the engineered barrier system in a high-level waste repository, which should be constructed in a hard rock formation at a depth of several hundred meters below the ground surface. The primary function of the buffer and backfill is to seal the underground excavation as a preferred flow path for radionuclide migration from the deposited high-level waste. This study investigates the hydraulic conductivity and swelling pressure of Kyungju Ca-bentonite, which is the candidate material for the buffer and backfill in the Korean reference high-level waste disposal system. The factors that influence the hydraulic conductivity and swelling pressure of the buffer and backfill are analyzed. The factors considered are the dry density, the temperature, the sand content, the salinity and the organic carbon content. The possibility of deterioration in the sealing performance of the buffer and backfill is also assessed.

ECC로 피복된 고강도콘크리트의 폭렬저감 및 열적특성에 관한 실험적 연구 (Fire Resistant Performance of Anti-Spalling ECC Layers in High-Strength Concrete Structures)

  • 이재영;권영진
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2008년도 춘계 학술논문 발표대회
    • /
    • pp.199-202
    • /
    • 2008
  • The purpose of this study is to obtain the fundamental fire resistance performance of engineered cementitious composites(ECC) under fire temperature in order to use the fire protection material in high-strength concrete structures. The present study conducted the experiment to simulate fire temperature by employing of ECC and investigated experimentally the explosion and cracks in heated surface of these ECC. In the experimental studies, 3 HSC specimens are being exposed to fire, in order to examine the influence of various parameters(such as depth of layer=20, 30, 40mm; construction method=lining type) on the fire performance of HSC structures. Employed temperature curve were ISO 834 criterion(3hr), which are severe in various criterion of fire temperature in building structures. The numerical regressive analysis and proposed equation to calculate ambient temperature distribution is carried out and verified against the experimental data. By the use of proposed equation, the HSC members subjected to fire loads were designed and discussed.

  • PDF