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SSRN 2025年

作者： Kuetzing, Peter M. Scheven, Ulrich M. Arruda, Ellen M. Department of Mechanical Engineering University of Michigan Ann ArborMI48109 United States Department of Biomedical Engineering University of Michigan Ann ArborMI48109 United States Program in Macromolecular Macromolecular Science and Engineering University of Michigan Ann ArborMI48109 United States

The ability of the Anterior Cruciate Ligament (ACL) to dissipate energy during cyclic loading conditions is crucial for understanding ACL failure. This study employs a novel mechanical test fixture for both shorter duration Digital Image Correlation (DIC) and longer duration Repeated Cycle-Recovery (RCR) ex-vivo experiments. The fixture ensured effective clamping and precise alignment of the Anterior Medial Bone-Ligament-Bone (AM BLB) samples while preserving the integrity and camera view of the region directly above the entheses. Results from the DIC and RCR experiments provide compelling evidence of localized hysteresis and evolving energy dissipation characteristics. The RCR experiments indicate a reduction in the energy absorption capabilities of the AM BLB with progressive cyclic loading, evident by a decrease in normalized hysteresis and diminished viscoelasticity over time. Furthermore, DIC experiments revealed strain concentrations in areas prone to acute ACL injuries. These findings underscore the importance of considering cyclic loading and localized strain behaviors in ACL failure mechanisms and may inform strategies for injury prevention and rehabilitation. © 2025, The Authors. All rights reserved.

关键词： Cyclic loads

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Zero Thermal Expansion Metamaterial Designs for Space Structures

Zero Thermal Expansion Metamaterial Designs for Space Struct...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Lu, Wei-Chun Oudghiri-Idrissi, Othman Poli, Andrea Arruda, Ellen M. Tol, Serife Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States Fariborz Maseeh Department of Civil Architectural and Environmental Engineering The University of Texas at Austin 301 E. Dean Keeton St AustinTX78712 United States Department of Mechanical Engineering Macromolecular Science and Engineering Program University of Michigan 2350 Hayward St Ann ArborMI48109 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The precision of space structures is sensitive to high-temperature variation during on-orbit operations. This work develops zero thermal expansion (ZTE) metamaterials that can be integrated into space structures to restrict large thermal deformation under precision requirements. The proposed bi-material ZTE metamaterial beams show extremely low coefficients of thermal expansion (CTE) for a wide temperature variation. Static and dynamic analyses are conducted on the designed metamaterials for performance evaluation. The proposed ZTE beam elements are integrated into a 48-meter rib of a space RF antenna to enhance its thermal precision over a wide temperature range. Further, experimental validation of the ZTE truss beam design is conducted in a thermal chamber to demonstrate its low thermal deformation compared to a reference aluminum truss beam. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Trusses

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Material Design for Durable Lubricant-Infused Surfaces That Can Reduce Liquid and Solid Fouling

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ACS Nano 2025年第19期19卷 2025 May 7页

作者： Wang, Fan-Wei Sun, Jianxing Tuteja, Anish Department of Chemical Engineering University of Michigan Ann ArborMI48109 United States Biointerfaces Institute University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Macromolecular Science and Engineering Program University of Michigan Ann ArborMI48109 United States

Liquid and solid fouling is a pervasive problem in numerous natural and industrial settings, significantly impacting energy efficiency, greenhouse emissions, operational costs, equipment lifespan, and human health. Inspired by pitcher plants, recently developed lubricant-infused surfaces (LISs) demonstrate resistance to both liquid and solid accretion under diverse environmental conditions, offering a potential solution to combat various foulants such as ice, bacteria, and mineral deposits. However, the commercial viability for most fouling-resistant LISs has thus far been compromised due to the challenges associated with maintaining a stable lubricant layer during operation. This review aims to address this important concern by providing systematic material design guidelines for fabricating durable LISs. We discuss fundamental design principles, methods for evaluating fouling resistance, and strategies to prevent lubricant loss. By presenting a comprehensive design methodology for this important class of materials, this review aims to aid future advancements in the field of antifouling surfaces, potentially impacting a variety of industries ranging from marine engineering to medical device manufacturing. © 2025 American Chemical Society.

关键词： Biofouling

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EFFECT OF COMPOSITION ON MOLECULAR ALIGNMENT IN POLYETHYLENE TEREPHTHALATE COPOLYMERS

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POLYMER 1982年第4期23卷 505-508页

作者： WANG, CS YEH, GSY Macromolecular Science and Engineering Program Department of Chemical Engineering The University of Michigan Ann Arbor Michigan 48109 USA

In this study molecular alignment in copolymers of polyethylene terephthalate (PET) and p -hydroxybenzoic acid (PHB) was examined by means of differential radial distribution function ( DRDF ) analysis of wide angle X-ray scattering data. The study was carried out using two representative copolymers with the PHB content of 30 and 60 mol%. The DRDF curves for the amorphous and the partially crystalline samples of these copolymers showed periodic intermolecular peaks up to various radial distances. The appearance of these peaks at ∼5 A ̊ periodicity suggested the existence of more-or-less parallel chain segments in the copolymers. The extent of the lateral molecular organization was ∼15 and 30 A ̊ for the amorphous copolymers containing 30 and 60 mol% PHB, respectively. A substantial structural difference was therefore shown for the copolymers in this composition range. The DRDF curve for the amorphous copolymer with 30 mol% PHB was found to be very similar to that for the previously reported glassy PET with 0 mol% PHB, indicating that the two materials had almost the same intermolecular structure. The structural information revealed by these DRDF results was in agreement with the various property changes caused by varying PHB contents of the copolymers.

关键词： Polymers liquid crystalline differential radial distribution function wide angle X-ray scattering molecular alignment polyethylene terephthalate copolymers

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Validation and Mechanistic Studies of the Headspace Effect in MOF Synthesis

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Angewandte Chemie 2025年第12期137卷

作者： Julia C. Donovan Keenan R. Wright Adam J. Matzger Department of Chemistry Institution University of Michigan Address 930 North University Avenue Ann Arbor Michigan 48109-1055 United States Charles G. Overberger Collegiate Professor of Chemistry and Macromolecular Science & Engineering Department of Chemistry and Macromolecular Science and Engineering Program Institution University of Michigan Address 930 North University Avenue Ann Arbor Michigan 48109-1055 United States

The influence of headspace volume and composition on metal–organic framework (MOF) synthesis has been largely overlooked with no mechanisms currently invoking these factors. Herein, we reveal that an increased volume of oxygen in the headspace during the synthesis of zinc carboxylate-based MOFs (MOF-5, MOF-177, and IRMOF-8) as well as UiO-66 and ZJU-28 accelerates crystal formation. Investigation into the underlying mechanism of this phenomenon elucidates the critical roles played by all reagents, and some of their byproducts, in MOF synthesis. These insights are the key to developing more efficient and sustainable synthetic strategies for MOF production.

关键词： crystal growth formamide nitrosamine nucleation Raman spectroscopy

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Fabrication of electrodes for polymer actuators and sensors via self-assembly

Fabrication of electrodes for polymer actuators and sensors ...

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IEEE Sensors 2004

作者： Supriya, Lakshmi Claus, Richard O. Macromolecular Science and Engineering Program Virginia Polytechnic Institute State University Blacksburg VA 24061 United States

A method for the fabrication of conductive gold electrodes on flexible polymer substrates, using a solution-based selfassembly process, has been developed. This involves the use of functionalized silanes with amino- or mercaptogroups to anchor the gold to the substrate. Colloidal gold particles are deposited from solution and the formation of a conductive film is achieved by reducing more gold onto the attached particles by a "seeding" process. Conductive films have been successfully deposited on materials like Kapton and polyethylene with a surface resistance of 1Ω/sq and good adhesion properties. Films have also been deposited on Nafion, an ionic polymer used in polymer actuators and sensors, for the fabrication of polymer transducers. Preliminary tests using these electrodes on Nafion show sensing and actuation behavior. © 2004 IEEE.

关键词： Polymer membrane electrodes

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Tear Growth Mechanisms in High-Grade Bursal-Sided Partial Thickness Tears in the Rotator Cuff Measured with Full Volume Methods

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SSRN 2025年

作者： Villacís Núñez, Carla Nathaly Scheven, Ulrich Bedi, Asheesh Arruda, Ellen M. Department of Mechanical Engineering University of Michigan G.G. Brown Laboratory 2350 Hayward St. Ann ArborMI48109 United States Department of Orthopedic Surgery University of Michigan Taubman Health Care Center 2912 1500 E Medical Center Dr. Ann ArborMI48109 United States Department of Biomedical Engineering University of Michigan 1107 Carl A. Gerstacker Building 2200 Bonisteel Blvd Ann ArborMI48109 United States Program of Macromolecular Science and Engineering University of Michigan 1221 Beal Ave Ann ArborMI48109 United States 2464 Stone Rd. Ann ArborMI48105 United States

In this work, we evaluate the mechanical response of rotator cuff tendons with high-grade partial thickness tears through a novel full volume measurement technique. As opposed to traditional strain-measurement methods, which examine surfaces of the tendon or localized two-dimensional regions, we have probed three-dimensional strains including internal locations. Differences between the intact and torn states have been considered. The torn condition depicts sliding between cut/uncut tissue regions, revealing regions of high shear strain concentration at the boundaries of detached/attached tissue portions. At both submaximal and supramaximal force levels, the internal and inferior bands of the tendon show high shear strain magnitudes, which could indicate regions of high risk for tear propagation. Geometrical features which could explain strain distribution differences in their intact and torn conditions are also analyzed. Through the understanding of full volume displacement and strain distributions, our study elucidates why two-dimensional values might not represent the global behavior of the injured tendon, critical components of the Lagrangian strain tensor which have not been probed before, and important implications for surgical repairs. © 2025, The Authors. All rights reserved.

关键词： Tendons

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Rheological Properties of Silica Filled Poly (Methyl Methacrylate)

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MRS Online Proceedings Library 2011年第1期385卷 173-178页

作者： Derek P. Rucker Stacy G. Bike Macromolecular Science and Engineering Program University of Michigan Ann Arbor USA

Ceramic fiber spinning is critical to the manufacture of fibrous monolith ceramics, and understanding the interactions between the polymer matrix and ceramic particle filler is necessary to predict the flow properties of these systems. In this study, poly (methyl methacrylate) (PMMA) was filled with octadecanol-coated St6ber silica, and the rheological behavior of the filled polymers investigated at various filler volume fractions. The rheological behavior of these materials was studied in both dynamic and steady-state experiments. The time required for filled PMMA to reach steady-state behavior under constant shear stress was found to be long, on the order of an hour. The steady-state viscosities increased as expected with filler volume fraction, but did not correlate well with existing models. This is hypothesized to be a result of matrix-filler surface interactions, and will be investigated further in future work.

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Synthesis and characterization of multiblock partially fluorinated hydrophobic poly(ether ether ketone) hydrophilic disulfonated poly(arylene ether sulfone) copolymers for proton exchange membranes

Synthesis and characterization of multiblock partially fluor...

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20th Annual Meeting of the North American Membrane Society 2010, NAMS 2010 and 11th International Conference on Inorganic Membranes 2010, ICIM 2010

作者： Chen, Yu Lee, Chang Hyun Lane, Ozma McGrath, James E. Macromolecular Science and Engineering Program Macromolecules and Interfaces Institute Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States

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Bioimmobilization using huisgen -dipolar cycloaddition on vapor-based polymer coatings

Bioimmobilization using huisgen -dipolar cycloaddition on va...

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235th ACS National Meeting, Spring 2008

作者： Nandivada, Himabindu Jiang, Xuwei Panades, Augusti Bourke, Allison Yoshida, Mutsumi Chen, Hsien-Yeh Lahann, Joerg Macromolecular Science and Engineering Program Department of Chemical Engineering University of Michigan 2300 Hayward St. Ann Arbor MI 48109-2136 United States

No abstract available

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