실리케이트계 반응성 나노소재의 시멘트 혼화재로써 적용 가능성에 대한 실험적 연구

김원우(Won-Woo Kim),문재흠(Jae-Heum Moon),백철우(Chul-Woo Baek),양근혁(Keun-Hyeok Yang) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.4

본 연구에서는 나노소재를 콘크리트용 혼화재로 사용 시 압축강도 증진효과를 실험적으로 분석하였다. 콘크리트용 배합설계를 위해 시멘트 비중 시험(KS L 5110) 방법을 이용하여 5종의 실리케이트계와 1종의 티타늄계 나노소재의 비중을 측정하였다. 그리고 BS EN 196-1의 시멘트 페이스트의 강도측정을 통해 K-value 산정하여 나노소재의 반응성을 검토하였다. 실리케이트계 나노소재 2종의 압축강도 증진효과 분석을 위해 건설용 혼화재 및 활성화재를 함께 사용하여 압축강도를 비교분석하였다. 본 연구에 사용한 실리케이트계 나노소재의 비중은 1.40 – 2.11 수준으로 OPC 대비 비중이 낮게 측정되었으며 나노소재의 반응성은 OPC 대비 7일차에 최대 1.22배, 28일차에 최대 1.12배 높게 분석됐다. 나노소재의 비중이 낮아 나노소재를 사용한 콘크리트의 단위중량은 2.08 – 2.24 수준으로 OPC 배합 2.26과 비교해 상대적으로 낮게 나타났다. 나노소재를 사용한 배합의 압축강도는 재령 28일 기준 81.47-101.34MPa로 건설용 혼화재 및 활성화재를 사용 시 OPC 배합과 비교해서 압축강도가 최대 47.5% 증가했다. In this study, nano-silica and nano-titanium were selected to determine the possibility of applying the binder to reactive nano materials. The basic characteristics of the nano material candidate group were reviewed. and the reactivity of nano materials was reviewed through K-value. The reactivity of the nano silicate materials was measured to be high. Therefore, as a final candidate group, nano silicate materials were selected. The finally selected reactive nano material was reviewed for its usability as a construction binder. The mechanical properties and unit weight of cement paste were reviewed using silica fume and blast furnace slag and nano materials. When cement composites with nano silicate materials, it was confirmed that it was effective in improving the mechanical performance and decrease the unit weight of cement composites.

중국의 재료과학분야 연구현황과 우리의 대응방안

노경란,길상철,남수우,Noh, Kyung Ran,Kil, Sang-Cheol,Nam, Soo Woo 한국재료학회 2013 한국재료학회지 Vol.23 No.12

Recent rapid development of the Chinese economy based on science and technology is challenging Korean industries and economy. Since the driving force for this rapid development of China is known to be scientific technologies, the purpose of this research is to confirm the current status of Chinese scientific research in the field of "Materials Science and Engineering" and propose a strategy for competition with China. Even though there are numerous journals of "Materials Science and Engineering", the 10 most popular journals with high impact factors were selected to cover general materials, nano materials, bio materials, and electronic materials. It was found that the number of scientific papers written by Chinese scientists for the materials field in the 10 journals was slowly increasing from the year 2000 until 2005, but has been rapidly increasing since 2005. This research found that Chinese research activities in the traditional metallic materials and nano materials have tremendously increased to occupy around 30 % or more papers published in several major journals related with materials science and engineering. On the other hand, bio materials and electronic materials research has not been pursued so actively; however, very recently the number of publications in these fields is also beginning to increase. To compete with this tremendously growing Chinese scientific development, Korea should have a policy of "selection and concentration" in materials-related fields, including basic science in nano, bio, and electronic materials.

나노클레이 첨가량에 따른 나노재료 시멘트 모르타르에 정착된 보강섬유의 인발성능

오리온,박찬기,Oh, Ri-On,Park, Chan Gi 한국농공학회 2013 한국농공학회논문집 Vol.55 No.3

Recently, it has been studied for the application of nano-materials in the concrete. Applied a small amount of nano-materials can achieve the goal of high strength, high performance and high durability. The small addition of nano clay improves strength, thermal stability, and durability of concrete because of the excellent dispersion. The present study has investigated the effectiveness, when varying with the contents of nano clay, influencing the pull-out behavior of macro synthetic fibers in nano materials cement mortar. Pullout tests conducted in accordance with the Japan Concrete Institute (JCI) SF-8 standard for fiber-reinforced concrete test methods were used to evaluate the pullout performance of the different nano clay. Nano clay was added to the 0, 1, 2, 3, 4 and 5 % of cement weight. The experimental results demonstrated that the addition of nano clay led to improve the pull-out properties as of the load-displacement curve in the precracked and debonded zone. Also, the compressive strength, flexural strength and pullout performance and of Mix No. 1 and No. 2 increased up to the point when nano clay used increased by 2 and 3 % contents, respectively, but decreased when the exceeded 3 and 4 %, respectively. It was proved by verifying increase of the scratching phenomenon in macro synthetic fiber surface through the microstructure analysis on the surface of macro synthetic fiber.

A study on 3D printing materials in product design and art area

Jung, Hyong Gi(정형기),Hong, Sung Yeap(홍성엽) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.22 No.-

Building materials layers upon layers to produce a desired product, 3D printing, so called the ‘Third Industrial Revolution’, is expected to bring significant changes throughout the industry besides being an innovation in the manufacturing technology. A 3D printer produces a product by using additive manufacturing, a process to stack lay by lay according to spraying of powder or liquid materials to its 2D cross-section by a digitalized 3D product design. Even though 3D printing technology is broadly used in product design area in addition to industry, the 3D printing materials are not known very much. In this study, the classification of 3D printing materials that are recently used in the arts are discussed with the respective properties except for the bio-materials. Metals, plastics such as PLA, ABS and nylon, and nanomarterials such as carbon nano tube, graphene are discussed as 3D printing materials. By the discussion of the unique properties of those 3D printing materials, artists and product designers will be understand the materials and possibly combine the discussed materials to find new 3D printing materials.

Fluorescent carbon nano-materials from coal-based precursors: unveiling structure–function relationship between coal and nano-materials

Kundu Niloy,Sadhukhan Dhrubajyoti,Sarkar Supriya 한국탄소학회 2022 Carbon Letters Vol.32 No.3

Fluorescent carbon nano-materials with quantum confinement and edge effects have recently piqued attention in a variety of applications, including biological imaging, drug delivery, optoelectronics and sensing. These nano-materials can be synthesized from a variety of carbon-based precursors using both top-down and bottom-up methods. Coal and its derivatives typically include a vast crystalline network and condensed aromatic ring cluster, which can be easily exfoliated by chemical, electrochemical, or physical processes to produce nano-materials. As a result, they are regarded as a low-cost, abundant and efficient carbon source for the fabrication of high-yield nano-materials. Nano-materials synthesized from coal-based precursors have outstanding fluorescence, photostability, biocompatibility and low toxicity, among other properties. Their properties in optical sensors, LED devices, bio-imaging, and photo and electro-catalyst applications have already been investigated. In this review, we have highlighted current developments in the synthesis, structural properties and fluorescence properties of nano-materials synthesized from coal-based precursors.

고압환경에서의 결정 크기에 원시료의 상이 미치는 영향: 비정질 시료와 나노파우더를 이용한 시료의 결정 크기 비교

김은정,알레시오 잔도나,타케히코 히라가,사나에 고이즈미,노부요시 미야지마,토모오 카추라,소병달 한국광물학회 2023 광물과 암석 (J.Miner.Soc.Korea) Vol.36 No.3

본 연구에서는 고압 환경에서 합성된 결정 입자의 크기에 원시료(starting materials)의 상(phase)이 미치는 영향을 확인했다. 상이 다른 두 가지 원시료인 비정질 시료와 나노파우더 시료를 이용해 알루미늄이 부화된 고압의 환원환경에서 삼원계 시스템인 브리지마나이트-페리클레이스-칼슘 페라이트(calcium ferrite)상의 MgAl2O4을합성했다. 시료는 40 GPa 2000 K의 압력온도 조건에서 20 시간 동안 가열하여 합성했다. 합성된 시료는 비정질시료를 이용한 경우 입자 크기가 50-200 nm였으며, 나노파우더를 이용한 경우 ~500 nm로 나타났다. 이러한 차이는 1) 시료가 합성된 2000 K의 온도가 낮아 비정질 시료의 경우 결정 성장보다 결정핵 성장이 더 우세하게 나타났거나 2) 시료에 존재할 수 있는 산화 환원반응 상태의 차이로 생각된다. 추후 다원계 시스템에 대한 고압 실험을수행할 때 비정질 시료보다 나노파우더를 원시료로 이용하는 것이 결정 성장에서 더 유리할 것으로 생각된다. In this study, we report the effect of starting materials on the grain size in a multi-component system at high pressure experiments. We used two different starting materials, glass and nano powders, to synthesize bridgmanite in the reduced conditions in the presence of calcium-ferrite-phase MgAl2O4 to compared the grain size of synthesized samples. After synthesizing the sample at 40 GPa, 2000 K for 20 hrs, the sample from glass showed the grain size of 50-200 nm whereas the one from nano powders has ~500 nm of grains. This difference may come from 1) the temperature of 2000 K which is low enough for glass starting materials to make more crystal nucleis than to grow crystal size or 2) the possible difference in the redox state of starting materials. It is suggested that the using of nano powders is better to synthesize bigger grains in high pressure experiments with multi-component systems rather than using glass starting materials.

국내 나노안전성 관련 규제의 법체계 고찰

이천무(Lee Cheon-mu),윤종민(Yoon Chong-min) 한국기술혁신학회 2016 기술혁신학회지 Vol.19 No.4

최근 일부 나노물질과 나노제품의 보건 및 환경에 대한 유해성과 위해성 문제가 사회적 이슈로 제기되는 등 과거 예상하지 못했던 부정적인 영향이 현실화되면서 나노물질 또는 나노기술이 적용된 제품의 안전성 확보가 선결되어야 한다는 사회적 공감대가 확산되고 있다. 나노물질이 환경과 인체에 미치는 위험으로부터 국민건강과 안전을 확보하기 위해 전 세계적으로 나노물질에 대한 관리 및 규제정책을 강화하고 있는 추세이며, 한국은 2011년에 ‘나노안전관리 종합계획(2012~2016)’을 수립하여 나노안전성 확보를 위한 범부처 정책을 추진하고 있다. 하지만, 제도적 측면에서 명확한 근거가 될 수 있는 나노안전 법제가 미비하고 나노물질의 응용범위의 다양성을 고려할때 기존 관계 법령의 개정을 통해서는 사후대응적 한계와 전주기적 관리 및 종합적인 관리체계가 부족한 것이 현실이다. 이에 본 논문은 국내 나노안전 관리에 관한 국가정책 및 관련 법제현황을 분석하고 현행 제도상의 한계점들을 검토하여 나노안전 기반을 확립할 발전적인 법제적 개선방안을 제시하고자 한다. Recently, the social issue about harmful effects of nano-materials including nano-products to human body and environment have been raised, which were not expected in times past. To prevent the risks of nano-materials on the environment and human body, the regulatory policies are reinforced to ensure public health in world trends. In Korea, governmental department has prepared the policy for ‘National nano-safety Management Master Plan’ since 2011. However, it is very hard to manage all kinds of nano-materials, due to lack of nano-safety law and a wide range of nano-technology application. This study aims to analyze the current situation of the national policy related to nano-safety management and legislation, and also review the limitation of current system to propose improvement plan for nano-safety.

정보마당 : 중국의 재료과학분야 연구현황과 우리의 대응방안

남수우 대한금속재료학회(구 대한금속학회) 2014 재료마당 Vol.27 No.4

Recent rapid development of the Chinese economy based on science and technology is challenging Korean industries and economy. Since the driving force for this rapid development of China is known to be the scientific technologies, the purpose of this research is to confirm the current status of the Chinese scientific research and propose a strategy for the competition with China. It is known that the number of scientific papers for materials field written by Chinese scientists is rapidly increasing after the year 2000. In this research, it is found that the research activities in the traditional metallic materials and nano materials are tremendously increased to occupy around 30% or more papers published in several major journals related with materials science. On the other hand, bio materials and electronic materials researches are not so active. To compete with China, Korea should have a policy of "selection and concentration" for the field of basic science in nano, bio and electronic materials.

탄소나노재료-리튬이온전지 융합연구의 현황 분석 및 미래유망분야 도출 연구

임상우(SangWoo Lim),유종태(JongTae Yoo) 한국기술혁신학회 2018 한국기술혁신학회 학술대회 발표논문집 Vol.2018 No.11

1991년 Sony 社의 리튬이온전지 등장 이후, 빠르게 변화하는 기술 환경은 고용량, 고효율성, 안전성 등 성능이 대폭 향상된 리튬이온전지의 시장 수요를 지속적으로 증가시켜왔다. 이러한 수요 속에 탄소나노재료와 리튬이온전지의 융합 연구는 기존의 한계점을 극복하고 관련 산업의 패러다임을 변화시킬 혁신적인 기술로 많은 연구자들에 의해 주목받고 있다. 이에 본 연구에서는 2가지 단계를 통해 리튬이온전지와 탄소나노재료의 융합 기술에 대한 동향을 분석하였다. Phase 1로 탄소나노재료-리튬이온전지 융합기술의 사례분석을 수행하였다. Phase 2로 LDA 알고리즘을 활용하여 탄소나노재료-리튬이온전지 산업의 기술 동향을 분석하였다. 이러한 연구 결과는 이차전지분야의 연구방향 설정 및 민·관의 R&D 투자방향 수립에 큰 도움을 줄 것으로 기대된다. Of various rechargeable energy storage systems reported to date, lithium-ion batteries (LIBs) have occupied a predominant position from the first commercialization thereof in 1991. However, the rapidly changing technology environment, including smart portable electronics, internet of things (IoTs), and electric vehicles (EVs), has driven a relentless pursuit of high-energy-density/high-safety rechargeable energy storage systems with reliable electrochemical performance. Among the vast variety of energy materials, carbon nano-materials have garnered considerable attention as a powerful tool to address the above mentioned challenges. Here, we introduce the technical analysis on current trends and future outlook for nano-battery interdisciplinary research. In the first phase, case studies for the LIBs are carried out especially focused on carbon nano-materials. Then, in the second phase, technology trends for the nano-battery interdisciplinary research were analyzed though the LDA Algorithm based on patent data. We anticipate that this study will provide a promising perception for establishing the research direction and R&D investment in the nano-battery interdisciplinary research.

나노입자 첨가 유리섬유강화 복합재료의 전자기파 차폐특성

정우균(W. K. Jung),안성훈(S. H. Ahn),원명식(M. S. Won) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

The research on electromagnetic shielding has been advanced for military applications as well as for commercial products. Utilizing the reflective properties and absorptive properties of shielding material, the replied signal measured at the rear surface or at the signal source can be minimized. The shielding effect was obtained from materials having special absorptive properties or from structural characteristics such as stacking sequence. Recently researchers studied the electromagnetic properties of nano size particles. In this research {glass fiber}/{epoxy}/{nano particle} composites(GFR-Nano composites), was fabricated using various nano particles, and their properties in electromagnetic shielding were compared. For the visual observation of the nano composite materials, SEM(Scanning Electron Microscope) and TEM(Transmission Electron Microscope) were used. For the measurement of electromagnetic shielding, HP8719ES S-parameter Vector Network Analyser System was used on the frequency range of 8㎓ ~12㎓. Among the nano particles, carbon black and Multi-Walled Carbon Nano-Tube (MWCNT) revealed outstanding electromagnetic shielding. Although silver nano particles (flake and powder) were expected to have effective electromagnetic shielding due to their excellent electric conductivities, test showed little shielding effect.