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209th ECS Meeting

作者： Roy, Abhishek Hickner, Michael A. Lee, Hae-Seung Badami, Anand Yu, Xiang Li, Yanxiang Glass, Tom McGrath, James E. Macromolecular Science and Engineering Program Macromolecules and Interfaces Institute Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States Chemical and Biological Systems Department Sandia National Laboratories Albuquerque NM 87185 United States

ISBN: (纸本)9781566775359

Disulfonated poly(arylene ether sulfone) random copolymers have shown promise as potential candidates for proton exchange membranes. The chemical structure of these copolymers has served as a basis for the molecular design of new random and multiblock copolymers. In random copolymers the sulfonic acid is distributed statistically, while in the multiblock copolymers the chemical structure is designed to have co continuous hydrophilic and hydrophobic domains. The effect of these variables on the transport properties of the membranes was investigated. For the random copolymers, high proton conductivity was observed at higher IEC along with high methanol permeability. But for the multiblock copolymers, it was possible to combine high proton conductivity with low methanol permeability. Improved proton conductivity was observed under partially hydrated conditions for samples with higher block lengths. Self diffusion coefficient of water was also measured by NMR which provided better understanding of the transport process. copyright The Electrochemical Society.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Enhancing microplastic capture efficiencies with adhesive coatings on stainless-steel filters

RSC Applied Polymers

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RSC Applied Polymers 2024年第3期2卷 456-460页

作者： Ramkumar, Malavika Ji, Woojung Thurber, Henry E. Clough, Madeline E. Chirdon, Sarena McNeil, Anne J. Department of Chemistry University of Michigan 930 North University Avenue Ann Arbor 48109-1055 MI United States Macromolecular Science and Engineering Program University of Michigan 2300 Hayward Street Ann Arbor 48109-2800 MI United States

Microplastics have been found in our food, water, and air, raising concerns about their potential health impacts. While environmental remediation may be intractable, we should prioritize minimizing our exposure. In this context, an adhesive-coated stainless-steel filter was developed herein to remove microplastics from water. © 2024 RSC.

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A powerless optical microsensor for monitoring intraocular pressure with keratoprostheses

A powerless optical microsensor for monitoring intraocular p...

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2013 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013

作者： Ghannad-Rezaie, M. Gulari, M.N. De Melo Franco, R. Mian, S.I. Chronis, N. Department of Biomedical Engineering University of Michigan Ann Arbor United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor United States Department of Ophthalmology and Visual Sciences University of Michigan Ann Arbor United States Department of Mechanical Engineering University of Michigan Ann Arbor United States

ISBN: (纸本)9781467359818

Frequent and accurate measurement of intraocular pressure (IOP) is required in monitoring patients who are at high risk of developing glaucoma. We present a novel electronic-free, wireless, optomechanical implantable IOP microsensor. The microsensor has a total volume of less than 1mm3 and is integrated into a keratoprosthesis (KPro). We performed ex-vivo experiments by implanting the microsensor/KPro assembly into human eyebank globes for two weeks. Our microsensor had 2 mmHg accuracy and less than 1 mmHg zero-drift. © 2013 IEEE.

关键词： Risk assessment

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Simulations of layer-by-layer assembly of polyelectrolyte multilayers

Simulations of layer-by-layer assembly of polyelectrolyte mu...

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Society of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005

作者： Patel, Pritesh Jeon, Junhwan Dobrynin, Andrey V. Mather, Patrick T. Dept. Chemical Engineering University of Connecticut Storrs CT 06269 Polymer Program University of Connecticut Storrs CT 06269 Dept. Physics University of Connecticut Storrs CT 06269 Dept. Macromolecular Science and Engineering Case Western Reserve University Cleveland OH 44106

Layer-by-layer processing of polyelectrolyte multilayers is a polymer processing technique that enables molecular-level control over the formation of precision coatings. Despite present widespread use, a fundamental understanding of the process remains elusive prompting us to employ molecular dynamics simulations of the process. Multilayer build-up was achieved through sequential adsorption of charged polymers in a layer-bylayer fashion from dilute solutions, the strong electrostatic attraction between oppositely charged polyelectrolytes driving multilayer growth. We find that a charge reversal after each deposition step is critical for steady multilayer growth and a linear increase in polymer mass adsorbed after several deposition steps. Also, substantial intermixing between chains adsorbed during different deposition steps is observed. These results will be summarized, along with a perspective for the future, in our interactive presentation.

关键词： Multilayers

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A POWERLESS OPTICAL MICROSENSOR FOR MONITORING INTRAOCULAR PRESSURE WITH KERATOPROSTHESES

A POWERLESS OPTICAL MICROSENSOR FOR MONITORING INTRAOCULAR P...

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International Conference on Solid-State Sensors, Actuators and Microsystems

作者： M. Ghannad-Rezaie M. N. Gulari R. de Melo Franco S. I. Mian N. Chronis Department of Biomedical Engineering University of Michigan Macromolecular Science and Engineering Program University of Michigan Department of Ophthalmology and Visual Sciences University of Michigan

ISBN: (纸本)9781467359825

Frequent and accurate measurement of intraocular pressure (IOP) is required in monitoring patients who are at high risk of developing glaucoma. We present a novel electronic-free, wireless, optomechanical implantable IOP microsensor. The microsensor has a total volume of less than 1mm~3 and is integrated into a keratoprosthesis (KPro). We performed ex-vivo experiments by implanting the microsensor/KPro assembly into human eyebank globes for two weeks. Our microsensor had 2 mmHg accuracy and less than 1 mmHg zero-drift.

关键词： Wireless pressure sensor intraocular pressure implantable biocompatible near infrared

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Dispersion of cobalt ferrite functionalized graphene nanoplatelets in PLA for EMI shielding applications 36

Dispersion of cobalt ferrite functionalized graphene nanopla...

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36th Technical Conference of the American Society for Composites 2021: Composites Ingenuity Taking on Challenges in Environment-Energy-Economy, ASC 2021

作者： Anurakparadorn, Kanat Taub, Alan Michielssen, Eric Department of Materials Science and Engineering Macromolecular Science and Engineering Program University of Michigan 2300 Hayward St Ann ArborMI48109 United States Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States Department of Electrical Engineering and Computer Science University of Michigan 1310 Beal Ave Ann ArborMI48109 United States

ISBN: (纸本)9781713837596

The proliferation of wireless technology calls for the development of cost-effective Electromagnetic Interference (EMI) shielding materials that reduce the susceptibility of high-speed electronic circuits to undesired incoming radiation. Ideally, such materials offer protection over wide frequency ranges and are insensitive to the polarization or angle of incidence of the impinging fields. Here, next-generation EMI shielding materials composed of polymer composites with conductive and magnetic fillers are introduced. It is shown that careful control of the concentration and dispersion of the polymers’ conductive and magnetic constituents permits tuning of the composites’ intrinsic electrical and magnetic properties. The resulting EMI shields are lightweight, cheap and offer greater protection than traditional metal gaskets and foams. In this work, cobalt ferrite magnetic nanoparticles (CoFe2O4) decorated on graphene-based material were dispersed in polylactic acid (PLA) matrix for high EM absorption level in X-band (8-12 GHz). The decoration of the magnetic particles was performed on the as-prepared conductive graphene nanoplatelets (GNP) and reduced graphene oxide (rGO). GNP composites exhibited higher DC conductivity, and permittivity than rGO composites. This is attributed to issues associated with the reduction process, including a lack of conductivity due to the insulated oxygen functional groups and the reduction in the lateral size. Compared with rGOs, the lack of out-plane functional groups causes the cobalt ferrite nanoparticles to agglomerate and not cover the entire surface of the GNPs. These morphological differences improve the magnetization and EM absorption of the composite system. The compatibilizer (pyrene-PLA-OH) was added to the composites to enhance dispersion of the GNPs in the polymer matrix which benefits in higher absorption of the shield. The influence of the compatibilizer on parameter, the reflection loss (RL) of the composite were determi

关键词： Cost effectiveness

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Properties of the surface-modified layer of plasma-oxidized poly(dimethylsiloxane)

Properties of the surface-modified layer of plasma-oxidized ...

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2006 MRS Spring Meeting

作者： Mills, Kristen L. Zhu, Xiaoyue Lee, Donghee Takayama, Shuichi Thouless, M.D. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 United States Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 United States

ISBN: (纸本)1558998810

Exposure of poly(dimethylsiloxane) (PDMS) to oxygen plasma creates a thin, stiff surface-modified layer that reaches a submicron depth. Due to a significant modulus mismatch between the stiff surface-modified layer and the compliant bulk PDMS the surface-modified layer forms intricate patterns of surface buckles when under compressive stress and nano-cracks when under tensile stress. It is desirable to be able to design patterns of nano-cracks, or at least to have an understanding of them. Among the properties necessary to do this are the thickness and elastic modulus of the surface-modified layer. Due to the very small length scale of the surface-modified layer, it is a significant challenge to measure these properties. In this proceedings paper, a two-step method is described for determining the thickness and elastic modulus of the surface-modified layer using the atomic force microscope (AFM). First, nanoindentation is performed from which the bending stiffness of the surface-modified layer is calculated. Second, the surface-modified layer thickness is determined by using phase imaging on the cross-section of oxidized PDMS to map the region of the relatively stiffer surface-modified layer. © 2006 Materials Research Society.

关键词： Silicones

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Structural Relaxations of Thin Polymer Films

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Physical Review Letters 2012年第26期108卷 268304-268304页

作者： Bradley Frieberg Emmanouil Glynos Peter F. Green Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109 USA Departments of Material Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA Chemical Engineering University of Michigan Ann Arbor Michigan 48109 USA

Time-dependent changes of thermodynamic properties due to structural relaxations and physical aging occur in all glasses. We show that the physical aging of thin supported films of star-shaped macromolecules, with f arms of length Narm, exhibits average aging dynamics that are sensitive to f and Narm. Regions of the films in proximity to interfaces age at substantially different rates than the interior of the film; this is also true of linear chain systems. This behavior may be reconciled in terms of a universal picture that accounts only for changes in the local Tg of the films.

关键词： POLYMERS THIN films RELAXATION phenomena THERMODYNAMICS LINEAR systems STRUCTURAL dynamics

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Patch-clamp study: Nanoscale hole formation in living cell plasma membrane induced by polymer nanoparticles

Patch-clamp study: Nanoscale hole formation in living cell p...

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235th ACS National Meeting, Spring 2008

作者： Chen, Jiumei Orr, Bradford Hoil, Mark Banaszak Program of Macromolecular Science and Engineering University of Michigan Ann Arbor MI 48109 United States Department of Physics University of Michigan Ann Arbor MI 48109 United States Program of Applied Physics University of Michigan Ann Arbor MI 48109 United States Department of Chemistry University of Michigan Ann Arbor MI 48109 United States

No abstract available

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Spatiotemporal multi-omics: exploring molecular landscapes in aging and regenerative medicine

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Military Medical Research 2025年第4期12卷 528-566页

作者： Liu-Xi Chu Wen-Jia Wang Xin-Pei Gu Ping Wu Chen Gao Quan Zhang Jia Wu Da-Wei Jiang Jun-Qing Huang Xin-Wang Ying Jia-Men Shen Yi Jiang Li-Hua Luo Jun-Peng Xu Yi-Bo Ying Hao-Man Chen Ao Fang Zun-Yong Feng Shu-Hong An Xiao-Kun Li Zhou-Guang Wang Affiliated Cixi Hospital Wenzhou Medical University Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine Vision and Brain Health)School of Pharmaceutical ScienceWenzhou Medical University National Key Laboratory of Macromolecular Drug Development and Manufacturing School of Pharmaceutical ScienceWenzhou Medical University State Key Laboratory of Bioelectronics School of Biological Science&Medical EngineeringSoutheast University School of Pharmaceutical Sciences Guangdong Provincial Key Laboratory of New Drug ScreeningSouthern Medical University Department of Human Anatomy Shandong First Medical University&Shandong Academy of Medical Sciences Integrative Muscle Biology Laboratory Division of Regenerative and Rehabilitative SciencesUniversity of Tennessee Health Science Center Key Laboratory for Laboratory Medicine Ministry of EducationZhejiang Provincial Key Laboratory of Medical GeneticsSchool of Laboratory Medicine and Life ScienceWenzhou Medical University Key Laborator y of Imaging Diagnosis and Minimally Invasive Intervention Research Institute of Imaging Diagnosis and Minimally Invasive Intervention Researchthe Fifth Affiliated Hospital of Wenzhou Medical UniversityLishui Hospital of Zhejiang University School and Hospital of Stomatology Wenzhou Medical University Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of Singapore Clinical Imaging Research Centre Centre for Translational MedicineYong Loo Lin School of MedicineNational University of Singapore Nanomedicine Translational Research Program NUS Center for NanomedicineYong Loo Lin School of MedicineNational University of Singapore Institute of Molecular and Cell Biology Agency for ScienceTechnologyand Research (A*STAR)

Aging and regeneration represent complex biological phenomena that have long captivated the scientific community. To fully comprehend these processes, it is essential to investigate molecular dynamics through a lens that encompasses both spatial and temporal dimensions. Conventional omics methodologies, such as genomics and transcriptomics, have been instrumental in identifying critical molecular facets of aging and regeneration. However, these methods are somewhat limited, constrained by their spatial resolution and their lack of capacity to dynamically represent tissue alterations. The advent of emerging spatiotemporal multi-omics approaches, encompassing transcriptomics, proteomics, metabolomics, and epigenomics, furnishes comprehensive insights into these intricate molecular dynamics. These sophisticated techniques facilitate accurate delineation of molecular patterns across an array of cells, tissues, and organs, thereby offering an in-depth understanding of the fundamental mechanisms at play. This review meticulously examines the significance of spatiotemporal multi-omics in the realms of aging and regeneration research. It underscores how these methodologies augment our comprehension of molecular dynamics, cellular interactions, and signaling pathways. Initially, the review delineates the foundational principles underpinning these methods, followed by an evaluation of their recent applications within the field. The review ultimately concludes by addressing the prevailing challenges and projecting future advancements in the field. Indubitably, spatiotemporal multi-omics are instrumental in deciphering the complexities inherent in aging and regeneration, thus charting a course toward potential therapeutic innovations.

关键词： Spatiotemporal multi-omics Aging and regeneration Cellular interactions Innovative therapeutic strategies

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