• characterizing viscoelastic properties of polyacrylamide gels

    Characterizing Viscoelastic Properties of Polyacrylamide Gels

    Characterizing Viscoelastic Properties of Polyacrylamide Gels A Major Qualifying Project Report: Submitted to the Faculty Of the WORCESTER POLYTECHNIC INSTITUTE In partial fulfillment of the requirements for the Degree of Bachelor of Science By Zachary Gautreau1, Jeremy Griffin1, Todd Peterson2, and Ploypan Thongpradit1 1Department of Biomedical Engineering, Worcester

  • characterizing viscoelastic properties of polyacrylamide gels

    Characterizing Viscoelastic Properties of Polyacrylamide Gels

    Characterizing Viscoelastic Properties of Polyacrylamide Gels Zach Gautreau, Jeremy Griffin, Todd Peterson, Ploypan Thongpradit Departments of Biomedical Engineering and Physics, Worcester Polytechnic Institute, Worcester, MA 01609-2280 The objective of this project was to quantify the viscoelastic properties of polyacrylamide gels. These gels

  • characterizing viscoelastic properties of polyacrylamide

    Characterizing Viscoelastic Properties of Polyacrylamide

    Characterizing Viscoelastic Properties of. Polyacrylamide Gels. A Major Qualifying Project Report: Submitted to the Faculty Of the WORCESTER POLYTECHNIC INSTITUTE In partial fulfillment of the requirements for the Degree of Bachelor of Science By Zachary Gautreau1, Jeremy Griffin1, Todd Peterson2, and Ploypan Thongpradit1 1 Department of Biomedical Engineering, Worcester

  • polyacrylamide gels characterizing viscoelastic

    Polyacrylamide Gels Characterizing Viscoelastic

    View Notes Polyacrylamide Gels from BIOMEDICAL 792397657 at Cambridge. Characterizing Viscoelastic Properties of Polyacrylamide Gels A Major Qualifying Project Report: Submitted to

  • "characterizing viscoelastic properties of polyacrylamide

    "Characterizing Viscoelastic Properties of Polyacrylamide

    Despite its common use in cell culture studies, polyacrylamide gel's mechanical properties remain unclear. To characterize this gel fully, atomic force microscopy, uniaxial testing, rheology, and ball indentation were used. The range of the elastic moduli was 1.9-7.5 kPa and 18.1-39.4 kPa, for 5%/0.025% and 8%/0.08% gel concentrations, respectively, and a Poisson's ratio of 0.45 was found

  • characterizing the viscoelastic properties of thin

    Characterizing the viscoelastic properties of thin

    2005-12-22· Characterizing the mechanical and viscoelastic properties of agarose and alginate hydrogel-based constructs was performed by using a novel indentation system. It has been demonstrated that this characterization system is able to produce reliable and reproducible data for both the pure hydrogels and cell embedded hydrogel constructs in a non

  • characterizing the viscoelastic properties of thin

    Characterizing the viscoelastic properties of thin

    We present a novel indentation method for characterizing the viscoelastic properties of alginate and agarose hydrogel based constructs, which are often used as a model system of soft biological tissues. A sensitive long working distance microscope was used for measuring the time-dependent deformation of the thin circular hydrogel membranes

  • biomedical 792397657 : characterizing viscoelastic

    BIOMEDICAL 792397657 : Characterizing Viscoelastic

    Access study documents, get answers to your study questions, and connect with real tutors for BIOMEDICAL 792397657 : Characterizing Viscoelastic Properties of Polyacrylamide Gels at

  • organogels

    Organogels

    At a critical concentration (the gel point), the polymeric network becomes large enough so that on the macroscopic scale, the solution starts to exhibit gel-like physical properties: an extensive continuous solid network, no steady-state flow, and solid-like rheological properties. However, organogels that are “low molecular weight gelators

  • (pdf) physical properties of polyacrylamide gels probed

    (PDF) Physical properties of polyacrylamide gels probed

    Physical properties of polyacrylamide gels probed by AFM and rheology Article (PDF Available) in EPL (Europhysics Letters) 109:38003 · January 2015 with 470 Reads How we measure 'reads'

  • bending of gel beams: method for characterizing elastic

    Bending of gel beams: method for characterizing elastic

    Bending of gel beams: method for characterizing elastic properties and permeability George W. Scherer E.I. Du Pont de Nemours & Co., Central Research & Development, PO Box 80356, Wilmington, DE 19880-0356, USA Received 13 August 1991 Revised manuscript received 4 November 1991 When a saturated gel is deformed, its mechanical response is profoundly influenced by the flow of liquid in its

  • characterization of polyacrylamide gels as an elastic

    Characterization of polyacrylamide gels as an elastic

    2005-04-26· For elastic PAAm gels, the rheological properties obeyed the theory of rubber elasticity; whereas for viscoelastic PAAm gels, shear modulus depended on temperature. The elastic PAAm gel fracture parameters did not change with deformation rate (0.2–5.5 s −1 ), indicating insignificant viscous flow during deformation.

  • (pdf) characterizing the viscoelastic properties of a

    (PDF) Characterizing the viscoelastic properties of a

    Characterizing the viscoelastic properties of a tissue mimicking phantom for ultrasound elasticity imaging studies Kaixuan Guo 1,Yanying Zhu 1,Jie Wang 1,Chuanyang Jiang 2 and Jiao Yu 1,*

  • study of the viscoelastic properties of the agarose gel

    Study of the viscoelastic properties of the agarose gel

    Therefore, the Kelvin-Voigt model we propose is well suited to describe the viscoelastic properties of pure agarose. The large values of the elasticity and viscosity parameter mean that this material prepared above 25 g / l is a consistent gel and that its viscoelastic behavior is closer to an elastic solid. Young's modulus and viscosity

  • development of techniques to compare mechanical

    Development of techniques to compare mechanical

    2006-05-17· We successfully prepared disulfide-reversible polyacrylamide hydrogels in the forms of a square column, a sphere, and a lens. The M n (number average molecular weight) of the reduced copolymer ranged from 696,800 to 870,900 Da. The physical and swelling properties of the gels were independent of shape.

  • characterizing the viscoelastic properties of thin

    Characterizing the viscoelastic properties of thin

    We present a novel indentation method for characterizing the viscoelastic properties of alginate and agarose hydrogel based constructs, which are often used as a model system of soft biological tissues. A sensitive long working distance microscope was used for measuring the time-dependent deformation of the thin circular hydrogel membranes

  • imaging viscoelastic properties of live cells by afm

    Imaging viscoelastic properties of live cells by AFM

    Imaging viscoelastic properties of live cells by AFM: power-law rheology on the nanoscale†. Fabian M. Hecht‡ a, Johannes Rheinlaender‡ a, Nicolas Schierbaum a, Wolfgang H. Goldmann b, Ben Fabry b and Tilman E. Schäffer * a a Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany.

  • microrheology of cross-linked polyacrylamide networks

    Microrheology of cross-linked polyacrylamide networks

    Microrheology of cross-linked polyacrylamide networks Bivash R. Dasgupta and D. A. Weitz Department of Physics and DEAS, Harvard University, Cambridge, Massachusetts 02138, USA sReceived 26 August 2004; published 24 February 2005d Experiments investigating the local viscoelastic properties of a chemically cross-linked polymer are per-formed on polyacrylamide solutions in the sol and the gel

  • preformed particle gels of sulfonated polyacrylamide

    Preformed particle gels of sulfonated polyacrylamide

    In this study, a preformed particle gel (PPG) was synthesized from sulfonated polyacrylamide and chromium metal cross-linker with specific concentration. The main characteristics of PPG, such as gelation time, gel fraction, swelling properties and salt sensitivity factor were investigated. The gel fraction of 94.1% practically indicated an appropriate conversion of gelant to the gel. The

  • tuning the range of polyacrylamide gel stiffness

    Tuning the Range of Polyacrylamide Gel Stiffness

    We also investigate how gel stiffness changes during storage over 10 days and find that specific gel formulations undergo significant stiffening (1.55 ± 0.13), which may be explained by differences in gel swelling resulting from initial polymerization parameters. Taken together, our study emphasizes the importance of polyacrylamide formulation

  • characterizing the viscoelastic properties of thin

    Characterizing the viscoelastic properties of thin

    Characterizing the mechanical and viscoelastic properties of agarose and alginate hydrogel-based constructs was performed by using a novel indentation system. It has been demonstrated that this characterization system is able to produce reliable and reproducible data for both the pure hydrogels and cell embedded hydrogel constructs in a non

  • viscoelastic and poroelastic mechanical characterization

    Viscoelastic and poroelastic mechanical characterization

    Here polyacrylamide gel materials are examined using different techniques (indentation, unconfined compression, dynamic mechanical analysis) at different length-scales and considering both viscoelastic and poroelastic mechanical frameworks. Elastic modulus values were similar for nanoindentation and microindentation, but both indentation

  • measurement of viscoelastic properties of polyacrylamide

    Measurement of Viscoelastic Properties of Polyacrylamide

    In this paper, polyacrylamide gel based tissue-mimicking phantoms have been developed to experimentally study the role of viscoelastic properties in a controlled manner. To measure the Young's modulus, the phantoms were subjected to linear loading, and the stress-strain relationship is deduced therefrom. It is seen that the phantoms show hysteresis behavior. The viscoelastic properties of

  • physical properties of polyacrylamide gels probed

    Physical properties of polyacrylamide gels probed

    Here, we will extend it up to 500 Hz by checking the overlap of the AFM and rheology data. We will choose to characterize polyacrylamide hydrogels due to their widely used mechanical properties [20,21], in particular in biology. These gels exhibit viscoelastic properties,depending on concentration or cross-linking density.

  • abstract: characterizing the viscoelastic behavior

    Abstract: Characterizing the Viscoelastic Behavior

    Our aim was to determine whether the viscoelastic properties of these gels changed at body temperature and over a range of oscillatory frequencies, which correlate with activities like walking or jogging. METHODS: Tests were performed on Mentor MemoryGel and MemoryShape, and Allergan regular gel and Style 410 implants. Gel samples were tested

  • comparison of viscoelastic properties of cancer and normal

    Comparison of viscoelastic properties of cancer and normal

    and reacting to the mechanical properties of the substrate shows that normal and cancer cells interact differently with of cancer cells to form metastases. Keywords Cancer cells · Viscoelastic properties · AFM · Stress relaxation · Polyacrylamide gels * Manfred Radmacher [email protected] 1 Institute of Biophysics, University of

  • polymer gel rheology and adhesion

    Polymer Gel Rheology and Adhesion

    polymers (in green) relax but gel network (black) is still deformed; d) long times: polymer i n gel network relaxes but retains an equilibrium deformation. The viscoelastic nature of polymer gels plays an important role in their adhesion properties. Adhesive properties of polymeric materials are fundamental to diverse industrial applications.

  • theoretical analysis of critical flowable physical gel

    Theoretical Analysis of Critical Flowable Physical Gel

    Those viscoelastic properties and the relaxation mechanisms have been systematically studied as a model system of physical gels [10–12]. In this paper, we theoretically analyze the PAAmVIm–Ni physical hydrogels at the gel point from a rheological viewpoint. It is widely known among rheologists that the storage modulus G0(w) and the loss modulus

  • dynamic mechanical analysis

    Dynamic mechanical analysis

    Dynamic mechanical analysis (abbreviated DMA, also known as dynamic mechanical spectroscopy) is a technique used to study and characterize materials.It is most useful for studying the viscoelastic behavior of polymers.A sinusoidal stress is applied and the strain in the material is measured, allowing one to determine the complex modulus.The temperature of the sample or the frequency of the

  • gel electrophoresis boston university

    Gel Electrophoresis Boston University

    Polyacrylamide Gel Electrophoresis Properties of polyacrylamide gels Polyacrylamide gels are prepared by chemical copoly-merization of acrylamide monomers with a cross-linking reagent, usually N,N0-methylenebisacrylamide. Acleartransparentgelisobtained,whichischemically inert, mechanically stable and without electroendos-mosis. Polymerization

  • indentation: a simple, nondestructive method

    Indentation: A simple, nondestructive method

    Indentation: A simple, nondestructive method for characterizing the mechanical and transport properties of pH-sensitive hydrogels Volume 27 Issue 1 Yuhang Hu, Jin-Oh You, Debra T. Auguste, Zhigang Suo, Joost J. Vlassak

  • polymer gel rheology and adhesion

    Polymer Gel Rheology and Adhesion

    polymers (in green) relax but gel network (black) is still deformed; d) long times: polymer i n gel network relaxes but retains an equilibrium deformation. The viscoelastic nature of polymer gels plays an important role in their adhesion properties. Adhesive properties of polymeric materials are fundamental to diverse industrial applications.

  • polyacrylamide find link

    Polyacrylamide Find link

    Peterson, T.; Thongpradit, P. Characterizing Viscoelastic Properties of Polyacrylamide Gels. Qualifying Report Project, Worcester Polytechnic Institute. 2006. MicroRNA sequencing (5,130 words) exact match in snippet view article find links to article small RNAs by Gel Electrophoresis Isolated RNA is run on a denaturing polyacrylamide gel. An imaging method such as radioactive 5’-32P-labeled

  • laser speckle rheology for evaluating the viscoelastic

    Laser Speckle Rheology for evaluating the viscoelastic

    Natural and synthetic hydrogel scaffolds exhibit distinct viscoelastic properties at various length scales and deformation rates. Laser Speckle Rheology (LSR) offers a novel, non-contact optical

  • use of viscoelastic substance in ophthalmic surgery

    Use of viscoelastic substance in ophthalmic surgery

    Among viscoelastic substances, sodium hyaluronate has become the most popular for intraocular surgeries since the introduction of Healon ® (sodium hyaluronate 1%, 4 × 10 6 daltons) in 1979. This review focuses on the recent development of a new generation of sodium hyaluronate agents with new rheologic properties and the relevant new techniques used in cataract, glaucoma, corneal, and

  • physical properties of polyacrylamide gels probed by afm

    Physical properties of polyacrylamide gels probed by AFM

    Physical properties of polyacrylamide gels probed by AFM and rheology. EPL, European EPL, European Physical Society/EDP Sciences/Societ a Italiana di

  • micromechanical properties of polyacrylamide

    Micromechanical Properties of Polyacrylamide

    Hydrogels are very compliant materials suitable for tissue engineering in various areas of biological and clinical research. Appropriate and effective application of hydrogels for specific cellular regeneration often requires precise knowledge of their mechanical properties. The present work focuses on measurements of mechanical deformation and creep properties of polyacrylamide hydrogels

  • separating viscoelasticity and poroelasticity of gels with

    Separating viscoelasticity and poroelasticity of gels with

    properties of the gel can be probed separately at different time scales of the test. The paperis organizedasfollows: In Sect.2, we formu-late a theory for ideal linear poroviscoelastic gels, and then present a general method to separate viscoelastic and poroe-lastic properties of gels. To validate the method, a finite-Separating viscoelasticity and poroelasticity of gels with different

  • viscoelastic and poroelastic mechanical characterization

    Viscoelastic and poroelastic mechanical characterization

    Here polyacrylamide gel materials are examined using different techniques (indentation, unconfined compression, dynamic mechanical analysis) at different length-scales and considering both viscoelastic and poroelastic mechanical frameworks. Elastic modulus values were similar for nanoindentation and microindentation, but both indentation

  • viscoelastic properties of an organically cross-linked gel

    Viscoelastic Properties of an Organically Cross-linked Gel

    Due to their thermal stability, organically cross-linked gels have been used to control water production in high temperature applications. Most of these gels consist of a polyacrylamide-based polymer and an organic cross-linker. Polyethyleneimine (PEI) has been used as an organic cross-linker for polyacrylamide-based copolymers. Recent work indicated that PEI can form ringing gels with

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