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Low Aspect Ratio Nature-Inspired Micropatterned Surfaces for Tunable Adhesion
Low Aspect Ratio Nature-Inspired Micropatterned Surfaces for Tunable Adhesion
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105200
- ISBN
- 9798297648302
- DDC
- 621
- 서명/저자
- Low Aspect Ratio Nature-Inspired Micropatterned Surfaces for Tunable Adhesion
- 발행사항
- [Sl] : Carnegie Mellon University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 101 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Majidi, Carmel.
- 학위논문주기
- Thesis (Ph.D.)--Carnegie Mellon University, 2025.
- 초록/해제
- 요약The ability to achieve controllable adhesion and friction is fundamental to biological locomotion, gripping, and object manipulation, yet remains a major challenge in soft robotics. Conventional bioinspired adhesives often employ high-aspect-ratio fibrillar structures that provide strong adhesion but are fragile, difficult to fabricate in soft elastomers. This thesis investigates an alternative approach: low-aspect-ratio, nature-inspired micropatterned surfaces that are mechanically stable, fabrication-friendly, and capable of tunable adhesion across diverse environments.In the first part of this work, hemispherical microstructures were fabricated in soft elastomers and characterized for their frictional adhesion response. These surfaces were integrated into soft robotic limbs and tested against glass, acrylic, and metal substrates under dry and wet conditions. Extending this concept, a five-limbed, sea star-inspired soft robot was developed, and its locomotion was quantified on flat and inclined acrylic surfaces in both environments. These studies demonstrated that hemispherical textures provide sufficient adhesion for locomotion while enabling easy detachment, highlighting their utility for amphibious soft robotics.The second part expanded the design space to include hemispherical, wedge, and sucker-like microstructures with aspect ratios near unity but spanning different functional sizes. Adhesion was systematically characterized on flat glass surfaces under varying unloading rates and applied loads. Further, adhesion was tested against individual glass beads of 0.5-5 mm diameter, and particulate manipulation was evaluated by quantifying bead pickup from a petri dish. These experiments revealed that hemispheres and plain elastomer surfaces rely primarily on rate-sensitive viscoelastic adhesion, whereas wedges and suckers, though ineffective on flat substrates, engage particles through interlocking or rim confinement. In bulk bead pickup, suckers achieved the highest mean performance, suggesting that geometry-driven confinement plays a central role in granular manipulation.Together, these studies show that geometry, loading rate, and environment jointly tune adhesion and friction in low-aspect-ratio micropatterned surfaces. No single mechanism is universally sufficient: hemispheres provide contact adhesion, wedges enable frictional interlocking, and suckers contribute confinement. Integrating these motifs into soft robotic systems demonstrated their ability to support amphibious locomotion and particle pickup across dry and wet conditions. This work establishes low-aspect-ratio micropatterns as a practical and versatile design strategy for tunable adhesion in soft robotics, offering new pathways for robots that can climb, grip, and manipulate objects in real-world, particulate-rich environments.
- 일반주제명
- Mechanical engineering
- 일반주제명
- Robotics
- 키워드
- Low aspect-ratio
- 키워드
- Nature-inspired
- 키워드
- Soft robotics
- 키워드
- Tunable adhesion
- 기타저자
- Carnegie Mellon University Mechanical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105200
■006m o d
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■020 ▼a9798297648302
■035 ▼a(MiAaPQ)AAI32244486
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aAcharya, Sampada S.▼0(orcid)0009-0001-0361-7917
■24510▼aLow Aspect Ratio Nature-Inspired Micropatterned Surfaces for Tunable Adhesion
■260 ▼a[Sl]▼bCarnegie Mellon University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a101 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Majidi, Carmel.
■5021 ▼aThesis (Ph.D.)--Carnegie Mellon University, 2025.
■520 ▼aThe ability to achieve controllable adhesion and friction is fundamental to biological locomotion, gripping, and object manipulation, yet remains a major challenge in soft robotics. Conventional bioinspired adhesives often employ high-aspect-ratio fibrillar structures that provide strong adhesion but are fragile, difficult to fabricate in soft elastomers. This thesis investigates an alternative approach: low-aspect-ratio, nature-inspired micropatterned surfaces that are mechanically stable, fabrication-friendly, and capable of tunable adhesion across diverse environments.In the first part of this work, hemispherical microstructures were fabricated in soft elastomers and characterized for their frictional adhesion response. These surfaces were integrated into soft robotic limbs and tested against glass, acrylic, and metal substrates under dry and wet conditions. Extending this concept, a five-limbed, sea star-inspired soft robot was developed, and its locomotion was quantified on flat and inclined acrylic surfaces in both environments. These studies demonstrated that hemispherical textures provide sufficient adhesion for locomotion while enabling easy detachment, highlighting their utility for amphibious soft robotics.The second part expanded the design space to include hemispherical, wedge, and sucker-like microstructures with aspect ratios near unity but spanning different functional sizes. Adhesion was systematically characterized on flat glass surfaces under varying unloading rates and applied loads. Further, adhesion was tested against individual glass beads of 0.5-5 mm diameter, and particulate manipulation was evaluated by quantifying bead pickup from a petri dish. These experiments revealed that hemispheres and plain elastomer surfaces rely primarily on rate-sensitive viscoelastic adhesion, whereas wedges and suckers, though ineffective on flat substrates, engage particles through interlocking or rim confinement. In bulk bead pickup, suckers achieved the highest mean performance, suggesting that geometry-driven confinement plays a central role in granular manipulation.Together, these studies show that geometry, loading rate, and environment jointly tune adhesion and friction in low-aspect-ratio micropatterned surfaces. No single mechanism is universally sufficient: hemispheres provide contact adhesion, wedges enable frictional interlocking, and suckers contribute confinement. Integrating these motifs into soft robotic systems demonstrated their ability to support amphibious locomotion and particle pickup across dry and wet conditions. This work establishes low-aspect-ratio micropatterns as a practical and versatile design strategy for tunable adhesion in soft robotics, offering new pathways for robots that can climb, grip, and manipulate objects in real-world, particulate-rich environments.
■590 ▼aSchool code: 0041.
■650 4▼aMechanical engineering
■650 4▼aRobotics
■653 ▼aLow aspect-ratio
■653 ▼aNature-inspired
■653 ▼aSoft microstructures
■653 ▼aSoft robotics
■653 ▼aTunable adhesion
■690 ▼a0548
■690 ▼a0800
■690 ▼a0771
■71020▼aCarnegie Mellon University▼bMechanical Engineering.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0041
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359697▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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