• 제목/요약/키워드: Printed Materials

검색결과 839건 처리시간 0.028초

Fabrication of three-dimensional electrical patterns by swollen-off process: An evolution of the lift-off process

  • Mansouri, Mariam S.;An, Boo Hyun;Shibli, Hamda Al;Yassi, Hamad Al;Alkindi, Tawaddod Saif;Lee, Ji Sung;Kim, Young Keun;Ryu, Jong Eun;Choi, Daniel S.
    • Current Applied Physics
    • /
    • 제18권11호
    • /
    • pp.1235-1239
    • /
    • 2018
  • We present a novel process to fabricate three-dimensional (3D) metallic patterns from 3D printed polymeric structures utilizing different hygroscopic swelling behavior of two different polymeric materials. 3D patterns are printed with two different polymers as cube shape. The surface of the 3D printed polymeric structures is plated with nickel by an electroless plating method. The nickel patterns on the surface of the 3D printed cube shape structure are formed by removing sacrificial layers using the difference in the rate of hygroscopic swelling between two printing polymer materials. The hygroscopic behavior on the interfaced structure was modeled with COMSOL Multiphysics. The surface and electrical properties of the fabricated three-dimensional patterns were analyzed and characterized.

원문대체자료로서 뉴미디어 도입의 효과분석 - Business Periodicals On disc와 Router Business Briefings를 중심으로 - (A Study on Analysis of Using the New Media Instead of Printed Materials)

  • 김윤실
    • 정보관리연구
    • /
    • 제27권2호
    • /
    • pp.1-32
    • /
    • 1996
  • 1990년대에 들어오면서 도서관에 데이터베이스 온라인탐색 및 CD-ROM탐색이 보편화되고 이러한 뉴미디어들은 이용자의 편의성 면에서, 도서관 경영적인 측면에서, 또는 소장공간의 효율적인 측면에서 볼 때 기존의 책자형 자료보다 도입효과가 있을 것으로 기대된다. 그러나 새로운 자료를 도입하거나, 시스템을 설계할 때 비용 대 효과를 객관적으로 평가하여야 하고, 구체적인 평가지침에 근거하여 일관성 있는 장서구성을 하여야 하므로 본 연구에서는 대외경제정책연구원 정보자료실을 모델로 하여 기존문헌, CD-ROM, 온라인탐색을 비교 평가하고자 한다.

  • PDF

Fabrication of Flexible Inorganic/Organic Hybrid Thin-Film Transistors by All Ink-Jet Printed Components on Plastic Substrate

  • Kim, Dong-Jo;Lee, Seong-Hui;Moon, Joo-Ho
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
    • /
    • pp.1463-1465
    • /
    • 2008
  • We report all-ink-jet printed inorganic/organic hybrid TFTs on plastic substrates. We have investigated the optimal printing conditions to make uniform patterned layers of gate electrode, dielectrics, source/drain electrodes, and semiconductor as a coplanar type TFT in a successive manner. All ink-jet printed devices have good mechanical flexibility and current modulation characteristic even when bent.

  • PDF

Comparative evaluation of shear bond strength of orthodontic brackets bonded to three-dimensionally-printed and milled materials after surface treatment and artificial aging

  • Ameer Biadsee;Ofir Rosner;Carol Khalil;Vanina Atanasova;Joel Blushtein;Shifra Levartovsky
    • 대한치과교정학회지
    • /
    • 제53권1호
    • /
    • pp.45-53
    • /
    • 2023
  • Objective: This study aimed to evaluate the shear bond strength (SBS) of orthodontic brackets bonded to three-dimensionally (3D)-printed materials after various surface treatments and artificial aging compared with that bonded to computer-aided design/computer-aided manufacturing (CAD-CAM) polymethyl methacrylate (PMMA)-milled materials. Methods: Eighty cylindrical specimens were 3D printed and divided into the following four subgroups (n = 20 each) according to the surface treatment and artificial aging procedure. Group A, sandblasted with 50 ㎛ aluminum oxide particles (SA) and aging; group B, sandblasted with 30 ㎛ silica-coated alumina particles (CO) and aging; group C, SA without aging; and group D, CO without aging. For the control group, 20 CAD-CAM PMMA-milled cylindrical specimens were sandblasted with SA and aged. The SBS was measured using a universal testing machine (0.25 mm/min), examined at ×2.5 magnification for failure mode classification, and statistically analyzed (p = 0.05). Results: The retention obtained with the 3D-printed materials (groups A-D) was higher than that obtained with the PMMA-milled materials (control group). However, no significant difference was found between the study and control groups, except for group C (SA without aging), which showed significantly higher retention than the control group (PMMA-SA and thermocycling) (p = 0.037). Study groups A-D predominantly exhibited a cohesive specimen mode, indicating specimen fracture. Conclusions: Orthodontic brackets bonded to 3D-printed materials exhibit acceptable bonding strengths. However, 3D-printed materials are prone to cohesive failure, which may result in crown fractures.

바코팅 공정을 이용한 유기 발광 다이오드 특성 향상 (Improvement of Inverted Hybrid Organic Light-emitting Diodes Properties with Bar-coating Process)

  • 곽선우;유종수;한현숙;김정수;이택민;김인영
    • 한국정밀공학회지
    • /
    • 제30권6호
    • /
    • pp.589-595
    • /
    • 2013
  • Solution processed conjugated molecules enable to manufacture various electronic devices by unconventional and cost effective patterning methods as screen or gravure printing. Spin-coating is the most popularly used method to form conjugated polymeric film for various electronic devices. The coating method has certain disadvantages such as a large amount of unwanted wastes, difficulty forming a film with a large area, and impossible to apply roll-to-roll manufacturing. We present here a promising alternative coating method, bar-coating for conjugated polymer film and OLED with the bar coated light emitting layer. In this papers, we show atomic force microscope images of spin- and bar-coated Poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) films on substrate. The bar-coated film showed a slight lower RMS roughness (1.058 [nm]) than spin-coated film (1.767 [nm]). It means the bar-coating is suitable method to form light emitting layers in OLEDs. By using bar-coating process, an OLED obtained with 4.7 [cd/A] in maximum current efficiency.

3차원 인쇄기술을 이용한 전자소자 연구 동향 (3D Printed Electronics Research Trend)

  • 박예슬;이주용;강승균
    • 마이크로전자및패키징학회지
    • /
    • 제28권2호
    • /
    • pp.1-12
    • /
    • 2021
  • 3차원 인쇄 기술은 제품의 설계를 3차원으로 하여 조립없이 제품의 생산까지의 시간을 획기적으로 줄이고 복잡한 구조도 구현할 수 있어 미래의 기술로 각광받고 있다. 본 논문은 3차원 인쇄기술을 이용한 전자소자에 대한 최근 연구동향을 알아보면서 구성품, 전원공급장치와 회로에서의 연결과 3차원 인쇄기술 PCB의 응용한 연구논문들을 소개하고 있다. 3차원 인쇄기술로 제작한 전자소자는 원스톱으로 전자소자, 솔더링(soldering), 스태킹(stacking), 회로의 봉지막(encapsulation)까지 제작함으로써 생산설비의 단순화와 전자기기를 개인 맞춤형을 할 수 있는 가능성을 보여주었다.

High performance inkjet printed polymer CMOS integrated circuits

  • Baeg, Kang-Jun;Kim, Dong-Yu;Koo, Jae-Bon;Jung, Soon-Won;You, In-Kyu;Noh, Yong-Young
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
    • /
    • pp.67-70
    • /
    • 2009
  • Printed electronics are emerging technology to realize various microelectronic devices via a cost-effective method. Here we introduce high performance inkjet printed polymer field-effect transistors and application to complementary integrated circuits with p-type and n-type conjugated polymers. The performance of devices highly depends on the selection of dielectrics, printing condition and device architecture. The device optimization and performances of various integrated circuits, e.g., complementary inverters and ring oscillators will be mainly discussed in this talk.

  • PDF

3D 프린팅 복합소재의 가공에서 가공 조건 선정을 위한 머신러닝 개발에 관한 연구 (Development of Machine Learning Method for Selection of Machining Conditions in Machining of 3D Printed Composite Material)

  • 김민재;김동현;이춘만
    • 한국기계가공학회지
    • /
    • 제21권2호
    • /
    • pp.137-143
    • /
    • 2022
  • Composite materials, being light-weight and of high mechanical strength, are increasingly used in various industries such as the aerospace, automobile, sporting-goods manufacturing, and ship-building industries. Recently, manufacturing of composite materials using 3D printers has increased. 3D-printed composite materials are made in free-form and adapted for end-use by adjusting the fiber content and orientation. However, research on the machining of 3D printed composite materials is limited. The aim of this study is to develop a machine learning method to select machining conditions for machining of 3D-printed composite materials. The composite material was composed of Onyx and carbon fibers and stacked sequentially. The experiments were performed using the following machining conditions: spindle speed, feed rate, depth of cut, and machining direction. Cutting forces of the different machining conditions were measured by milling the composite materials. PCA, a method of machine learning, was developed to select the machining conditions and will be used in subsequent experiments under various machining conditions.

Comparison of fracture strength, surface hardness, and color stain of conventionally fabricated, 3D printed, and CAD-CAM milled interim prosthodontic materials after thermocycling

  • Mesut Yildirim;Filiz Aykent;Mahmut Sertac Ozdogan
    • The Journal of Advanced Prosthodontics
    • /
    • 제16권2호
    • /
    • pp.115-125
    • /
    • 2024
  • PURPOSE. The purpose of this in vitro study was to investigate the fracture resistance, surface hardness, and color stain of 3D printed, CAD-CAM milled, and conventional interim materials. MATERIALS AND METHODS. A total of 80 specimens were fabricated from auto polymerizing polymethyl methacrylate (PMMA), bis-acryl composite resin, CAD-CAM polymethyl methacrylate resin (milled), and 3D printed composite resin (printed) (n = 20). Forty of them were crown-shaped, on which fracture strength test was performed (n = 10). The others were disc-shaped specimens (10 mm × 2 mm) and divided into two groups for surface hardness and color stainability tests before and after thermal cycling in coffee solution (n = 10). Color parameters were measured with a spectrophotometer before and after each storage period, and color differences (CIEDE2000 [DE00]) were calculated. The distribution of variables was measured with the Kolmogorov Smirnov test, and one-way analysis of variance (ANOVA), Tukey HSD, Kruskal-Wallis, Mann-Whitney U tests were used in the analysis of quantitative independent data. Paired sample t-test was used in the analysis of dependent quantitative data (P < .05). RESULTS. The highest crown fracture resistance values were determined for the 3D printed composite resin (P < .05), and the lowest were observed in the bis-acryl composite resin (P < .05). Before and after thermal cycling, increase in mean hardness values were observed only in 3D printed composite resin (P < .05) and the highest ΔE00 value were observed in PMMA resin for all materials (P < .05). CONCLUSION. 3D printing and CAD-CAM milled interim materials showed better fracture strength. After the coffee thermal cycle, the highest surface hardness value was again found in 3D printing and CAD-CAM milled interim samples and the color change of the bis-acryl resin-based samples and the additive production technique was higher than the PMMA resin and CAD-CAM milled resin samples.

FDM 방식으로 제작된 ABS 재료의 피로 특성 평가 (Fatigue Test of 3D-printed ABS Parts Fabricated by Fused Deposition Modeling)

  • 설경수;신병철;장성욱
    • 한국기계가공학회지
    • /
    • 제17권3호
    • /
    • pp.93-101
    • /
    • 2018
  • FDM is one of the popular 3D printing technologies because of an inexpensive extrusion machine and multi-material printing. FDM can use thermoplastics such as ABS and PLA. The 3D-printed ABS parts fabricated by FDM are attractive in the automotive industry because of their weight. A 10% reduction in weight can increase the fuel economy by approximately 7%. To use 3D-printed ABS parts as automotive parts, we should evaluate the 3D-printed parts in terms of automotive reliability. In this study, 3D-printed ABS samples were evaluated using Ono's rotary bending fatigue test. We obtained an S-N curve for the 3D-printed ABS specimen from the finite-element analysis. The S-N curve can be useful in early-stage design decisions for 3D-printed ABS parts.