International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition最新文献

FABRICATION OF PATTERNED HYDROGELS WITH CONTROLLED MECHANICAL PROPERTIES USING CHEMICALLY MODIFIED RLPS. 利用化学改性树脂制备具有控制机械性能的图案水凝胶。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2026-01-01 Epub Date: 2026-02-23 DOI: 10.1115/IMECE2025-164092

Ramadan Abouomar, Zameer Hussain Shah, David P Rivas, Sudipta Mallick, Luisa Palmese, Sai S Patkar, Kristi L Kiick, Sambeeta Das

{"title":"FABRICATION OF PATTERNED HYDROGELS WITH CONTROLLED MECHANICAL PROPERTIES USING CHEMICALLY MODIFIED RLPS.","authors":"Ramadan Abouomar, Zameer Hussain Shah, David P Rivas, Sudipta Mallick, Luisa Palmese, Sai S Patkar, Kristi L Kiick, Sambeeta Das","doi":"10.1115/IMECE2025-164092","DOIUrl":"10.1115/IMECE2025-164092","url":null,"abstract":"In our study, we created hydrogels containing selectively polymerized regions with distinct mechanical properties by photopolymerizing chemically modified resilin-like polypeptides (RLPs) under a variety of conditions. To promote the formation of microstructures, we utilized a poly(ethylene glycol) crosslinker and employed Digital Micromirror Display (DMD) techniques to pattern the hydrogel. The microstructures of the hydrogels were analyzed using various methods, such as confocal microscopy and scanning electron microscopy, while the local mechanical properties were determined through atomic force microscopy (AFM) measurements. Overall, our work demonstrates a versatile approach for creating hydrogels with spatially varying mechanical properties. The mechanical properties, both inside and outside the illuminated region, can furthermore be adjusted by adding a crosslinker. We find that the microstructure of the hydrogel is different when the hydrogel is crosslinked via DMD compared to a UV lamp, providing an additional method for material property control. These results have potential applications in various fields, including tissue engineering and drug delivery, where the ability to precisely control mechanical properties and microstructures is critical for achieving desired outcomes.","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"3 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13211947/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148045058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EFFECT OF SURFACE MODIFICATION ON LONG-TERM MECHANICAL AND TRIBOLOGICAL PERFORMANCE OF BIOMEDICAL POLYMERS. 表面改性对生物医用高分子材料长期力学和摩擦学性能的影响。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2025-11-01 Epub Date: 2026-02-23 DOI: 10.1115/imece2025-166637

Ravi Chandra Madasani, Mohammad Motaher Hossain

{"title":"EFFECT OF SURFACE MODIFICATION ON LONG-TERM MECHANICAL AND TRIBOLOGICAL PERFORMANCE OF BIOMEDICAL POLYMERS.","authors":"Ravi Chandra Madasani, Mohammad Motaher Hossain","doi":"10.1115/imece2025-166637","DOIUrl":"10.1115/imece2025-166637","url":null,"abstract":"Long-term mechanical durability of biomedical polymers is essential for their effectiveness in hip and knee joint replacement prostheses, where materials experience various stress situations in the presence of physiological fluids. However, prolonged exposure to physiological fluids can accelerate moisture absorption, leading to mechanical degradation of the polymers. This can significantly reduce the lifespan of polymers used in various biomedical applications, such as total joint replacement prostheses applications. Surface modification can improve hydrophobicity, which can delay moisture absorption and enhance the resistance to mechanical degradation. Among the various surface modification techniques, surface texturing has drawn significant attention as it does not alter the chemical properties of the material. This study investigates the role of surface texturing in improving the long-term mechanical and tribological performance of Ultrahigh Molecular Weight Polyethylene (UHMWPE) and High-Density Polyethylene (HDPE). UHMWPE and HDPE samples with square, cylindrical, and hemispherical micro-protrusions and microcavities were submerged in deionized (DI) water and compared against the mechanical properties of flat samples. Scratch and wear testing was done on flat and textured polymer samples under dry and boundary lubrication scenarios to investigate the effect of surface modification on tribological behavior of polymers. Relationships between long-term mechanical behavior and tribological performance under dry and boundary lubrication scenarios were sought. The findings highlight the crucial role of surface texturing in preserving mechanical and tribological performance under physiological conditions.","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"2025 Volume 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13020045/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147576822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IMPACT OF SURFACE TEXTURE ON MOISTURE ABSORPTION AND LONG-TERM MECHANICAL PERFORMANCE OF BIOMEDICAL POLYMERS. 生物医用高分子材料表面结构对吸湿性和长期力学性能的影响。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2024-11-01 Epub Date: 2025-01-23 DOI: 10.1115/IMECE2024-145742

Ravi Chandra Madasani, Mohammad Motaher Hossain

{"title":"IMPACT OF SURFACE TEXTURE ON MOISTURE ABSORPTION AND LONG-TERM MECHANICAL PERFORMANCE OF BIOMEDICAL POLYMERS.","authors":"Ravi Chandra Madasani, Mohammad Motaher Hossain","doi":"10.1115/IMECE2024-145742","DOIUrl":"https://doi.org/10.1115/IMECE2024-145742","url":null,"abstract":"Mechanical integrity over time is a crucial factor for various biomedical polymers used in numerous applications, including total joint replacement prostheses applications. However, moisture absorption can significantly affect the long-term mechanical behavior of these polymers, leading to potential degradation and failure. This research investigates how surface texture influences the long-term mechanical behavior of two biomedical polymers, High Density Polyethylene (HDPE) and Ultrahigh Molecular Weight Polyethylene (UHMWPE). A comprehensive analysis is conducted by comparing the mechanical performance of flat/smooth and textured HDPE and UHMWPE specimens subjected to moisture exposure over an extended period. A combination of laser engraving and hot-pressing techniques is used to introduce textures, with variation in geometry and dimension, on the surfaces of model polymers. Tensile tests are performed on both flat/smooth and textured specimens stored under dry condition and in moisture environment for up to 90 days. Effects of moisture absorption on mechanical properties are studied and compared for the flat/smooth samples as well as among different textured samples with varying geometries and dimensions. The results demonstrate that the introduction of surface texture delays moisture absorption compared to flat/smooth samples. This delayed moisture absorption enhances the long-term mechanical durability of polymers under moisture environment. Dynamic mechanical analysis (DMA) is conducted to understand the molecular mechanisms responsible for the observed long-term mechanical behavior. The findings highlight the critical role surface texture plays in mitigating moisture-induced degradation, thereby enhancing the long-term mechanical performance of biomedical polymers in moisture environments.","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"4 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12077233/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IMPROVING THE LONG-TERM DURABILITY OF POLYMERS USED IN BIOMEDICAL APPLICATIONS. 提高生物医学应用中所用聚合物的长期耐久性。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2023-10-01 Epub Date: 2024-02-05 DOI: 10.1115/IMECE2023-112796

Mohammad Motaher Hossain, Ravi Chandra Madasani

{"title":"IMPROVING THE LONG-TERM DURABILITY OF POLYMERS USED IN BIOMEDICAL APPLICATIONS.","authors":"Mohammad Motaher Hossain, Ravi Chandra Madasani","doi":"10.1115/IMECE2023-112796","DOIUrl":"10.1115/IMECE2023-112796","url":null,"abstract":"Hydrophobic surfaces can improve the long-term mechanical response of polymers by delaying their degradation caused by moisture absorption over time. This improvement in long-term mechanical performance can significantly increase the lifespan of polymers used in various biomedical applications, such as total joint replacement prostheses applications. Although a number of surface modification techniques have been developed over the years, such as introduction of various textures on the surface; their specific influences on hydrophobicity enhancement as well as long-term mechanical performance are yet to be fully understood. In this study, surface textures, with variation in type and geometry, are introduced on model Ultrahigh Molecular Weight Polyethylene (UHMWPE) and High Density Polyethylene (HDPE) surfaces to study the effect of surface modification on hydrophobicity and long-term mechanical performance under environmental conditions. The results show that introduction of surface textures significantly improves the hydrophobicity of model polymers. Texture length or diameter significantly affects the improvement in hydrophobicity. However, texture spacing does not have significant influence on the improvement in hydrophobicity. How this improvement in hydrophobicity facilitates improving the long-term mechanical performance under environmental conditions is investigated. The study provides useful guidelines to improve the long-term mechanical response of polymers for various applications, including biomedical applications.","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"2023 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11093517/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140923835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

HYDROPHOBICITY IMPROVEMENTS OF POLYMERS USED IN BIOMEDICAL APPLICATIONS. 用于生物医学应用的聚合物的疏水性改进。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2022-10-01 Epub Date: 2023-02-08 DOI: 10.1115/IMECE2022-95610

Mohammad Motaher Hossain, Vinay Reddy Lokasani

{"title":"HYDROPHOBICITY IMPROVEMENTS OF POLYMERS USED IN BIOMEDICAL APPLICATIONS.","authors":"Mohammad Motaher Hossain, Vinay Reddy Lokasani","doi":"10.1115/IMECE2022-95610","DOIUrl":"10.1115/IMECE2022-95610","url":null,"abstract":"Improvement in hydrophobicity is important for polymers used in various applications such as biomedical applications, as it can delay their degradation due to long-term exposure to moisture environments. Although a number of surface modification techniques have been developed over the years to improve hydrophobicity, their specific influences on hydrophobicity enhancement as well as long-term mechanical and tribological performances are yet to be fully understood. In this study, surface textures, with variation in type and geometry, are introduced on Ultrahigh Molecular Weight Polyethylene (UHMWPE) and High Density Polyethylene (HDPE) surfaces to study the effect of surface modification on hydrophobicity and long-term mechanical and tribological performances. Based on the theoretical study using Wenzel and Cassie-Baxter models, surface textures of various types and dimension are introduced on UHMWPE and HDPE surfaces. The results show that introduction of surface textures significantly improves the hydrophobicity of polymers. Specific relationship between texture type and geometry, and improvement in hydrophobicity is explored. Based on the comparison between experimental results and theoretical models, transition state modeling seems to be more suitable in describing the change in hydrophobicity with the addition of surface texture. The study provides useful guidelines to improve hydrophobicity of polymers for biomedical applications.","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"2022 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10205070/pdf/nihms-1897956.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9522331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EVALUATION OF NEEDLE DRIVER DESIGNS FOR ROBOT-ASSISTED NEEDLE INSERTIONS UNDER MRI GUIDANCE. MRI引导下机器人辅助针头插入的针头驱动器设计评估。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2022-10-01 Epub Date: 2023-02-08 DOI: 10.1115/IMECE2022-96678

Guanyun Liu, Yanzhou Wang, Gang Li, Kevin Cleary, Iulian Iordachita

引用次数: 0

DEMONSTRATION AND EXPERIMENTAL VALIDATION OF PLASTIC-ENCASED RESONANT ULTRASONIC PIEZOELECTRIC ACTUATOR FOR MRI-GUIDED SURGICAL ROBOTS. mri引导手术机器人用塑料封装谐振式超声压电驱动器的演示与实验验证。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87963

P. Carvalho, K. Gandomi, C. Nycz, G. Fischer

{"title":"DEMONSTRATION AND EXPERIMENTAL VALIDATION OF PLASTIC-ENCASED RESONANT ULTRASONIC PIEZOELECTRIC ACTUATOR FOR MRI-GUIDED SURGICAL ROBOTS.","authors":"P. Carvalho, K. Gandomi, C. Nycz, G. Fischer","doi":"10.1115/IMECE2018-87963","DOIUrl":"https://doi.org/10.1115/IMECE2018-87963","url":null,"abstract":"Intra-operative medical imaging based on magnetic resonance imaging (MRI) coupled with robotic manipulation of surgical instruments enables precise feedback-driven procedures. Electrically powered non-ferromagnetic motors based on piezoelectric elements have shown to be well suited for MRI robots. However, even avoiding ferrous materials, the high metal content on commercially available motors still cause distortions to the magnetic fields. We construct semi-custom piezoelectric actuators wherein the quantity of conductive material is minimized and demonstrate that the distortion issues can be partly addressed through substituting several of these components for plastic equivalents, while maintaining motor functionality. Distortion was measured by assessing the RMS change in position of 49 centroid points in a 12.5mm square grid of a gelatin-filled phantom. The metal motor caused a distortion of up to 4.91mm versus 0.55mm for the plastic motor. An additional SNR drop between motor off and motor spinning of approximately 20% was not statistically different for metal versus plastic (p=0.36).","PeriodicalId":73488,"journal":{"name":"International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition","volume":"121 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75691456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A BIOMECHANICAL AND THERMAL ANALYSIS FOR BONE AUGMENTATION OF THE PROXIMAL FEMUR. 股骨近端骨增强的生物力学和热分析。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88583

Amirhossein Farvardin, Mahsan Bakhtiari Nejad, Michael Pozin, M. Armand

引用次数: 3

OCT-BASED THREE DIMENSIONAL MODELING OF STENT DEPLOYMENT. 基于oct的支架部署三维建模。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2017-11-01 DOI: 10.1115/IMECE2017-72146

Pengfei Dong, David Prabhu, David L Wilson, Hiram G Bezerra, Linxia Gu

引用次数: 2

A MULTISCALE COMPUTATIONAL MODEL FOR THE GROWTH OF THE CRANIAL VAULT IN CRANIOSYNOSTOSIS. 颅缝闭合症颅穹窿生长的多尺度计算模型。

International Mechanical Engineering Congress and Exposition : [proceedings]. International Mechanical Engineering Congress and Exposition Pub Date : 2014-11-01 DOI: 10.1115/IMECE2014-38728

Chanyoung Lee, Joan T Richtsmeier, Reuben H Kraft

引用次数: 3