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Search Publications by: Kalman Migler (Fed)

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Displaying 26 - 50 of 106

Bottom Up Approaches to Improved Polyolefin Measurements

February 4, 2016
Author(s)
Sara Orski, Thomas W. Rosch, Anthony Kotula, Richard J. Sheridan, Frederick R. Phelan Jr., Kalman Migler, Chad R. Snyder, Luis F. Vargas Lara, Jack F. Douglas, Kathryn L. Beers
As a class of materials, polyolefins remain the largest production volume polymer in the world, as well as a highly desirable medium from which to engineer high performance and advanced properties for new applications. After decades of research, there are

Lightweight, flexible, high-performance carbon nanotube cables by scalable flow coating*

January 21, 2016
Author(s)
Nathan D. Orloff, Francesca Mirri, Aaron M. Forster, Rana NMN Ashkar, Robert Headrick, E. A. Bengio, Christian J. Long, April Choi, Yimin Luo, Angela R. Hight Walker, Paul Butler, Kalman D. Migler, Matteo Pasquali
Coaxial cables for data transmission are ubiquitously used in telecommunications, aerospace, automotive and robotics industries. Unfortunately, the metals used to make commercial cables are heavy and stiff. These undesirable traits are particularly

Mesomorphic Pathway in Early Stage Crystallization of Polyethylene

June 18, 2015
Author(s)
Kalman D. Migler, Angela R. Hight Walker, Anthony P. Kotula
The kinetic pathway by which a molten polymer transforms into a multi-length scale semi-crystalline structure upon cooling is an unsolved problem in polymer physics, yet it is critical to the processing, properties and ultimate performance of these

A Microliter Capillary Rheometer for Characterization of Protein Solutions

October 10, 2014
Author(s)
Steven D Hudson, Prasad S. Sarangapani, Kalman D. Migler, Jai A. Pathak
Rheometry is an important characterization tool for therapeutic protein solutions because it determines syringeability and relates indirectly to solution stability and thermodynamic interactions. Despite the maturity of rheometry, there remains a need for

Microfluidics Measurements of Interfacial Rheology

January 18, 2011
Author(s)
Jeffrey D. Martin, Joie N. Marhefka, Kalman D. Migler, Steven D. Hudson
The bulk properties and structural characteristics of emulsions arise substantially from their interfacial rheology, which depends strongly on surfactant mass transfer and its coupling to flow. Typical methods used to measure such properties often employ

lSPR Study of DNA Wrapped Single Wall Carbon Nanotube (ssDNA-SWCNT) Adsorption on a Model Biological (Collagen) Substrate

September 20, 2010
Author(s)
Jung Jin Park, Jeffrey Fagan, JiYeon Huh, Kalman D. Migler, Alamgir Karim, Dharmaraj Raghavan
The kinetics of single stranded-DNA dispersed single wall carbon nanotubes (SWCNTs) adsorption onto an immobilized collagen layer in a microfluidic channel was probed using surface plasmon resonance (SPR) imaging. The adsorption was measured for a range of

Development of a MEMS based Dynamic Rheometer

August 31, 2010
Author(s)
Gordon Christopher, Jae M. Yoo, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Rheological methods that interrogate nano-liter scale volumes of fluids and solids have advanced considerably over the past decade, yet there remains a need for methods that probe the frequency dependent complex rheological moduli through application of

Carbon Nanotubes: Measuring Dispersion and Length

August 26, 2010
Author(s)
Jeffrey A. Fagan, Barry J. Bauer, Erik K. Hobbie, Matthew Becker, Angela R. Hight Walker, Jeffrey R. Simpson, Jae H. Chun, Jan Obrzut, Vardhan Bajpai, Frederick R. Phelan Jr., Daneesh O. Simien, JiYeon Huh, Kalman D. Migler
Advanced technological uses of single-wall carbon nanotubes (SWCNTs) rely on the production of single length and chirality populations that are currently only available through liquid phase post processing. The foundation of all of these processing steps

Forced Assembly and Mixing of Melts via Planar Polymer Micro-Mixing

June 24, 2010
Author(s)
Doyoung Moon, Kalman D. Migler
The ability to force immiscible polymers into specific, targeted structures would enable the generation of blends with tailored performance by exploiting the intimate relationship between structure and blend properties. Here we present a strategy for the

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles

Microfluidic Mixer for Polymer Melts

June 22, 2009
Author(s)
Doyoung Moon, Kalman D. Migler
We present a novel microfluidic mixer for high temperature polymer melts based on the platform of the Multi-sample Micro-slit Rheometer (MMR). The device is essentially a static mixer with eight consecutive units of splitting and recombination flow formed

A Description of the Fluoroelastomer Coating Evolution as a Polymer Processing Aid

October 16, 2008
Author(s)
Mathurin G. Meillon, D Morgan, D Bigio, Kalman Migler, S Oriani
For decades, fluoroelastomers have been used as polymer processing aids (PPA). Previous works have measured the thickness of the PPA coating, its effects on the polymer/die interface, and proposed several mechanisms of PPA coating. In this work, the

A Multi-Sample Melt Micro-Rheometer

October 16, 2008
Author(s)
Anthony J. Bur, Kalman Migler
A slit micro-rheometer that is used for simultaneous measurement of melt viscosities of four samples has been developed. Sample size is less than 100 mg. The driving force for the rheometer is gas pressure from a nitrogen tank that forces polymer melt into

In-Situ Visualization of Novel Polymer Droplet Morphologies During Extrusion

October 16, 2008
Author(s)
Erik K. Hobbie, Kalman Migler
We report the observation of novel droplet morphologies in the high stress layers near the walls of a specially instrumented slit die. We utilize in-situ optical microscopy to study a dilute blend of polystyrene (PS) in a polyethylene (PE) matrix. At low

Measurement of Slippage Induced by a Polymer Processing Additive

October 16, 2008
Author(s)
Kalman Migler, C L. Gettinger, V P. Thlacker, R Conway
Flow profiles of a linear density polyethylene (LLDPE) were measured in an optical slit die situated at the exit of a twin screw extruder. The velocities of tracer particles were measured as a function of position across the slit die at various flow rates