댓글 0조회 수 84547추천 수 0
?

단축키

이전 문서

다음 문서

+ - Up Down Comment Print
?

단축키

이전 문서

다음 문서

+ - Up Down Comment Print

http://www.ncbi.nlm.nih.gov/pubmed/26549103


 2016 Jan 21;12(3):859-66. doi: 10.1039/c5sm01649e. Epub 2015 Nov 9.

Nanotribological and wetting performance of hierarchical patterns.

Abstract

Surface modification is a promising method to solve the tribological problems in microsystems. To modify the surface, we fabricated hierarchical patterns with different pitches of nano-scale features and different surface chemistries. Micro- and nano-patterns with similar geometrical configurations were also fabricated for comparison. The nano-tribological behavior of the patterns was investigated using an atomic force microscope at different relative humidity levels (5% to 80%) and applied normal loads (40 nN to 120 nN) under a constant sliding velocity. The results showed significant enhancement in the de-wetting and tribological performance of the hierarchical patterns compared with those of flat and micro- and nano-patterned surfaces. The PTFE-coated hierarchical patterns showed similar dynamic contact angles (advancing and receding) to those of the real lotus leaf. The influence of relative humidity on adhesion and friction behavior was found to be significant for all the tested surfaces. The tribological performance was improved as the pitch of the nano-scale geometry of the hierarchical pattern increased, even though the wetting property was not influenced significantly. A model was proposed based on the role of intermolecular force to explain the effect of the pitch of the hierarchical patterns on the adhesion and friction behavior. According to the model based on the molecular force, the contact between a ball and the patterned surface was a multi-asperity contact, contrary to the single-asperity contact predicted by the Johnson-Kendall-Roberts (JKR) and Maugis-Dugdale (MD) models. The strong intermolecular forces, which are activated in the confined spaces between the adjacent nano-pillars and the ball, contributed to the contact area and hence the adhesion and friction forces.



분류 제목 조회 수
Award 2019.11 한국비파괴검사학회 2019 추계학술대회 우수논문발표상 (박성현, 홍정연, 최성호, 장경영)     11071
Award 2019.07 한국비파괴검사학회 2019 춘계학술대회 우수논문발표상 (송동기, 류주영, 홍정연, 최성호, 장경영)     12445
Award 2019.07 한국비파괴검사학회 2019 춘계학술대회 우수논문발표상 (박성현, 심명종, 최성호, 장경영)     10975
International Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by measuring Acoustic Nonlinearity of Laser-generated Surface Acoustic Waves     15685
International Stress estimation using the acoustoelastic effect of surface waves in weak anisotropic materials     15771
International Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel     15251
Domestic Imaging and Sizing of Surface Defects Using Synthetic Aperture Focusing of Laser-generated Surface Waves     15460
Award 2018 산업통상자원부장관 위촉장  fileimage   20623
Award 2018.11 비파괴학회 우수포스터상 (이영진,박기태,김종범,김창수,장경영)     24971
Award 2018.11 비파괴학회 우수논문발표상 (김창수,김종범,송동기,장경영)     24881
International Internal defect detection using laser-generated longitudinal waves in ablation regime     36075
International Synthetic aperture imaging of contact acoustic nonlinearity to visualize the closing interfaces using tone-burst ultrasonic waves     38926
Domestic Variation of Acoustoelastic Effect in Al6061-T6 according to Heat Treatment Time     37222
International Dependence of Nonlinear Ultrasonic Characteristic on Second-Phase Precipitation in Heat-Treated Al 6061-T6 alloy     37557
International Relative Measurement of the Acoustic Nonlinearity Parameter using Laser Detection of an Ultrasonic Wave  fileimage   45758
International A Method to Estimate the Absolute Ultrasonic Nonlinearity Parameter from Relative Measurements  fileimage   48687
International Finite element analysis of a low-velocity impact test for glass fiber-reinforced polypropylene composites considering mixed-mode interlaminar fracture toughness  fileimage   46911
Award 2017년 비파괴검사학회지 우수논문발표상 (하홍필, 김종범, 장경영)  fileimage   40329
Award 2017 글로벌박사 펠로우십 (Global Ph.D. Fellowship) 1건 선정 - 전지현 (박사과정)     54268
Award 2017 글로벌박사 펠로우십 (Global Ph.D. Fellowship) 1건 선정 - 서호건 (박사과정)     53963
Workshop 제 5차 잠닉손상진단 핵심기술개발 Workshop  fileimage   56698
Award 2016년 비파괴검사학회지 우수논문발표상 (박성현, 김종범, 이주호, 장경영)  fileimage   57825
International Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter     87592
International Assessment of Thermal Aging of Aluminum Alloys by Acoustic Nonlinearity Measurement of Surface Acoustic Waves     84376
International Absolute Measurement and Relative Measurement of Ultrasonic Nonlinear Parameter     83571
International Experimental Comparison of Nonlinear Parameters Obtained from Absolute Measurement and Relative Measurement     83701
International Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers     83972
Award KSME-SEMES 오픈 이노베이션 챌린지 동상 수상 - 윤성희  fileimage   58872
Award 2016 글로벌박사 펠로우십 (Global Ph.D. Fellowship) 1건 선정 - 전지현 (석박사통합과정)  fileimage   58782
Award 2016 글로벌박사 펠로우십 (Global Ph.D. Fellowship) 1건 선정 - 서호건 (박사과정)     56398
Award JMST - JMST Contribution Award  fileimage   57888
Workshop Yoshikazu Ohara 교수 초청 세미나  fileimage   56885
Workshop Takahiro Hayashi 교수 초청 세미나  fileimage   57188
International Nanotribological and wetting performance of hierarchical patterns     84547
Workshop 제 4차 잠닉손상 진단 핵심기술개발 Workshop  fileimage   58365
Award 2015 산업부장관 표창  fileimage   59392
Workshop 제3차 잠닉손상 진단 핵심기술개발 Workshop  fileimage   57288
Workshop 김진연 박사 초청 세미나 "Advanced Ultrasonic Testingbased on Acoustic Nonlinearity Measurement for NDE"  fileimage   59121
Workshop 제2차 잠닉손상 진단 핵심기술개발 Workshop  fileimage   56018
Workshop 2차년도 잠닉손상진단 핵심기술개발 1세부과제 진행 회의  fileimage   58711
Workshop 잠닉손상 진단 핵심기술개발 2차년도 kick-off Meeting  fileimage   58331
Workshop The Workshop on Current & Future of Nonlninear Ultrasonic Techniques for NDE  fileimage   56704
Workshop The Pre-workshop on Current and Future of Nonlinear Ultrasonic Techniques for NDE  fileimage   57683
Workshop 잠닉손상 진단 핵심원천기술 개발 연구 Workshop  fileimage   57752
Workshop 잠닉손상 진단 핵심원천기술 개발 – 1세부 진도회의  fileimage   58404
Workshop 잠닉손상 진단 핵심원천기술 개발 Kick-off Meeting  fileimage   57175
Workshop Ultrasonic & Electromagnetic Waves for NDE and SHM  fileimage   57996
International Demonstration of Disturbance Propagation and Amplification in Car-Following Situation for Enhancement of Vehicle Platoon System     86591
International Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging     86055
International Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic     89011
International Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement     84252
International Non-Contact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy     84316
International Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime     85411
International Real-time detection of surface cracks on silicon wafers during laser beam irradiation     85505
Domestic High power CW laser-induced damage of CMOS image sensor     84893
Domestic Measurement of Ultrasonic Nonlinear Parameter by Using Non-Contact Ultrasonic Receiver     85346
Domestic Study on the Nonlinear Electromagnetic Acoustic Resonance Method for the Evaluation of Hidden Damage in a Metallic Material     84220
International Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves     94900
International Laser ultrasonic inspection in ablation regime     82798
International Improvement of Crack Sizing Performance by using Nonlinear Ultrasonic Technique     84754
Award 대한기계학회 - 우수 학생 논문상  fileimage   58999
Award 비파괴검사학회지 - 우수논문상  fileimage   57730
Award 한국도로공사 교통데이터 공모전 - 대한교통학회 회장상 수상 (김진수)  fileimage   100220
International In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe     89760
International In situ detection of laser-induced slip initiation on the silicon wafer surface     88229
International Initiation time of near-infrared laser-induced slip on the surface of silicon wafers     86517
Domestic Evaluation of Ultrasonic Nonlinear Characteristics in Artificially Aged Al6061-T6     89116
Domestic Simulations for Internal Defect Inspection using Laser Generated Ultrasonic Wave in Ablation Regime     88385
International Slip damage of silicon wafers subjected to continuous infrared laser irradiation     87962
International Thermal damages on the surface of a silicon wafer induced by a near-infrared laser     87674
Domestic Feasibility of MFC (Macro-Fiber Composite) Transducers for Guided Wave Technique     90363
Domestic Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models     89578
Domestic Evaluation of Ultrasonic Nonlinear Characteristics in Heat-Treated Aluminum Alloy     90398
Domestic A6061 합금의 석출경화 열처리에 따른 탄성파의 음향 특성 연구     91537
Award 비파괴검사학회지 - 우수 논문상  fileimage   63885
Award 한국ITS학회 - 우수논문상  fileimage   69577
International Crack Detection in Single-Crystalline Silicon Wafer Using Laser Generated Lamb Wave     88067
International Evaluation of Ultrasonic Nonlinear Characteristics in Heat-Treated Aluminum Alloy (Al-Mg-Si-Cu)     154828
International Application of Macrofiber Composite for Smart Transducer of Lamb Wave Inspection     90479
Domestic Thermal Damage Characterization of Silicon Wafer Subjected to CW Laser Beam     93333
International Imaging of contact acoustic nonlinearity using synthetic aperture technique     88615
Domestic Feasibility of MFC (Macro-Fiber Composite) Transducers for Guided Wave Technique     97947
Domestic Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile     95498
Domestic Evaluation of Ultrasonic Nonlinear Characteristics in Heat-Treated Aluminum Alloy     94742
International Influence of slit width on harmonic generation in ultrasonic surface waves excited by masking a laser beam with a line arrayed slit     87583
International Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy     89820
International Analysis of Transmitted Ultrasound signals through Apples at Different Storage Times using the Continuous Wavelet Transformation     88097
Domestic Fully Non-Contact Assessment of Acoustic Nonlinearity According to Plastic Deformation in Al6061 Alloy     92753
Domestic Imaging of Harmonic Wave Generated by Contact Acoustic Nonlinearity in Obliquely Incident Ultrasonic Wave     91826
Domestic Frequency Characteristics of Surface Wave Generated by Single-Line Pulsed Laser Beam with Two Kinds of Spatial Energy Profile Models: Gaussian and Square-Like     94852
International Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces     85724
International NDE of low-velocity impact damages in composite laminates using ESPI, digital shearography and ultrasound C-scan techniques     84577
Award Best Poster Award, 3rd International Symposium on Laser Ultrasonics and Advanced Sensing (Sungho Choi)     82013
Award Best Student Poster Presentation Award: FIRST PRIZE, 9th FEOFS (Sung-ho Choi)  fileimage   95473
Award 2013 글로벌박사펠로우십 신규 사업 2 건 최종 선정 (박사과정 김진수, 석박통합과정 서호건)     122730
Award 비파괴검사학회지 우수 논문상 (김정석, 남태형, 최성호, 장경영)  fileimage   70890
Workshop 2012 첨단 비파괴 진단 기술 워크샵, 제주도  fileimage   70540
International Surface characteristics of aluminum 6061-T6 subjected to Nd:YAG pulsed-laser irradiation     105127
International Fatigue-induced microdamage characterization of stainless steel 316L using innovative nonlinear acoustics     98658
International Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces     103039
Board Pagination ‹ Prev 1 2 3 Next ›
/ 3
Designed by hikaru100

나눔글꼴 설치 안내


이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소

SketchBook5,스케치북5

SketchBook5,스케치북5

SketchBook5,스케치북5

SketchBook5,스케치북5

ISNDE Laboratory
203-2,Engineering Center Annex
Hanyang University,
222 Wangsimni-ro, Seongdong-gu
Seoul 04763, Korea
04763 서울특별시 성동구 왕십리로 222
한양대학교 공업센터 별관 203-2호
지능계측 및 비파괴평가 연구실
Tel: 02 - 2220 - 4220
Fax: 02 - 2299 - 7207