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Search Publications by: Kalman Migler (Fed)

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Displaying 126 - 150 of 214

Dynamics of Wormlike Micelles in Elongational Flows

January 1, 2006
Author(s)
Philip A. Stone, Paul Dalhaimer, Dennis E. Discher, Eric J. Amis, Steven D. Hudson, Kalman D. Migler
Micelles formed of amphiphilic diblock copolymers may have applications in drug delivery and in understanding the physics of biological structures. Wormlike micelles, in particular, provide an opportunity to study the behavior of semiflexible rods in

Quantitative, Interactive Measurement of Tissue Engineering Scaffold Structure Using Immersive Visualization

January 1, 2006
Author(s)
Jeffrey Fagan, Erik K. Hobbie, Brian Landi, Idan Mandelbaum, Vardhan Bajpai, Barry J. Bauer, Kalman D. Migler, Jeffrey R. Simpson, Angela R. Hight Walker, Ryan Raffaelle
At NIST, we are using new approaches to better understand and quantify the structure of tissue engineering scaffolds. This approach uses immersive visualization (IV) and is inherently three dimensional, multivariate and interactive, providing real-time

Triple-Detector GPC Characterization and Processing Behavior of Long-Chain-Branched Polyethylene Prepared by Solution Polymerization With Constrained Geometry Catalyst

September 1, 2004
Author(s)
W Wang, S B. Kharchenko, Kalman D. Migler, S Zhu
Fourteen long-chain branched (LCB) polyethylene (PE) samples were prepared by a constrained geometry catalyst. The PE samples had average branching frequencies of 0.06 to 0.98 branches per polymer chain, determined by 13C NMR. These samples as well as five

Extraordinary Flow Characteristics of Nanotube-Filled Polymer Materials

August 2, 2004
Author(s)
S B. Kharchenko, Kalman D. Migler, Jack F. Douglas, Jan Obrzut, E A. Grulke
Carbon nanotubes are under intense investigation due their potential for modifying the electrical conductivity (s), shear viscosity (h) and other transport properties of polymeric materials. They are hybrids of ordinary filler particles and nanoscale

Eliminating Surface Melt Fracture Using PPA: The Role of PPA Domain Size

May 1, 2004
Author(s)
Mathurin G. Meillon, David C. Morgan, D Bigio, S B. Kharchenko, Kalman D. Migler, S Oriani
The investigation of the elimination of sharkskin using polymer processing aids (PPA) requires the consideration of factors such as: PPA domain size, operational shear rate and matrix/PPA viscosity ratio. In this work, the role of PPA droplet size in the

Elastic Flow Instability, Curved Streamlines and Mixing in Microfluidic Flows

February 1, 2004
Author(s)
Jai A. Pathak, David J. Ross, Kalman D. Migler
Flow instabilities are well known to occur in macroscopic flows when elastic fluids flow along curved streamlines. In this work we use flow visualization to study the mechanism underlying a purely elastic flow instability for Poiseuille flow in a micro (m)

Non-Linear Transport Properties of Carbon Nanotube Filled Polypropylene

February 1, 2004
Author(s)
S B. Kharchenko, Kalman D. Migler, Jack F. Douglas, Jan Obrzut, E A. Grulke
Dispersal of a relatively small concentration [O(1%) volume fraction] of multiwall carbon nanotubes (MWNT) into polypropylene (PP) is found to cause large and complex changes in nanocomposite transport properties. Specifically, both the shear viscosity h(g

Microfluidic Analogue of the 4-Roll Mill

January 1, 2004
Author(s)
Steven D. Hudson, Frederick R. Phelan Jr., Matthew D. Handler, J Cabral, Kalman D. Migler, Eric J. Amis
Microfluidic technology promises to revolutionize analytical (bio)chemistry, because molecular separations are faster, less expensive and more efficient than in traditional large scale equipment. Materials and complex-fluid sciences can likewise benefit