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Displaying 1 - 25 of 1508

Rheological Characterization of Next-Generation Ballistic Witness Materials for Body Armor Testing

March 14, 2019

Author(s):

Ran Tao, Kirk D. Rice, Aaron M. Forster, Randy A. Mrozek, Shawn T. Cole, Reygan M. Freeney, Anicet Djakeu Samen

Roma Plastilina No. 1 (RP1), a ballistic clay, is essential for establishing injury limits in standards-based ballistic resistance testing of body armor. It...

Targeting hMSC Response via Surface Carbonyl Groups, Contact Angle, and Protein Interactions

March 01, 2019

Author(s):

Max J. Lerman, Shinichiro Muramoto, Navein Arumugasaamy, Michael Van Order, Josephine Lembong, Anushka Gerald, John G. Gillen, John P. Fisher

Traditional 2D culture systems made of polystyrene (PS) require the addition of surface chemistry beyond the nominal phenyl groups present to facilitate and...

Identification of a mechanogenetic link between substrate stiffness and chemotherapeutic response in breast cancer

February 25, 2019

Author(s):

Brian G. Bush, Scott H. Medina, Emily Sevcik, Maggie Cam, Frank W. DelRio, Kaustav Nandy, Joel P. Schneider

Mechanical feedback from the tumor microenvironment regulates an array of processes underlying cancer biology. For example, increased stiffness of mammary...

Upstream vortex and elastic wave in the viscoelastic flow around a confined cylinder

January 28, 2019

Author(s):

Boyang Qin, Paul NMN Salipante, Steven D Hudson, Paulo E. Arratia

The viscoelastic flow past cylinder is a classic benchmark problem that is not completely understood. Using novel holographic particle velocimetry, we report...

Thermally stable cross-linked P84 with Superior Membrane H2/CO2 separation properties at 150 oC

January 06, 2019

Author(s):

Maryam Omidvar, Christopher M. Stafford, Haiqing Lin

Polymers with a strong size-sieving ability and superior H2/CO2 selectivity are of great interests for pre-combustion CO2 capture at 100 oC or above...

Hidden Hyperuniformity in Bottlebrush Polymer Melts

December 21, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

We show that the backbone chains of bottlebrush polymer melts exhibit a hidden hyperuniform packing over a wide temperature range above glass transition...

Validation of Single Particle ICP-MS for Routine Measurements of Nanoparticle Size and Number Size Distribution

November 25, 2018

Author(s):

Antonio R. Montoro Bustos, Premsagar P. Kavuri, Antonio M. Possolo, Natalia Farkas, Andras Vladar, Karen E. Murphy, Michael R. Winchester

Single particle inductively coupled plasma-mass spectrometry (spICP-MS) is an emerging technique capable of measuring nanoparticle size and number...

Tuning the Relaxation of Nano-Patterned Polymer Films with Polymer-Grafted Nanoparticles: Observation of Entropy-Enthalpy Compensation

November 06, 2018

Author(s):

Sonal Bhadauriya, Xiaoteng Wang, Jack F. Douglas, Praveen Pitliya, Jianan Zhang, Dharmaraj Raghavan, Michael R. Bockstaller, Christopher M. Stafford, Alamgir Karim

Polymer films provide a versatile plastic material in which complex functional relief patterns can be imprinted with a resolution down to tens of...

Contact resonance force microscopy for viscoelastic property measurements: From fundamentals to state-of-the-art applications

October 23, 2018

Author(s):

Jason P. Killgore, Frank W. DelRio

Contact resonance force microscopy (CRFM) is an atomic force microscopy (AFM) method that evolved from a curiosity about the detection of ultrasonic vibrations...

Flow fluctuations in wormlike micelle fluids

October 22, 2018

Author(s):

Paul NMN Salipante, Steven Meek, Steven D Hudson

We investigate the unstable flow of wormlike micelle solutions in pressure driven capillary flow, with a focus on the effect of entrance geometry on the fluid...

Combinatorial Cassettes for Higher-Throughput Screening of Osteogenesis

October 04, 2018

Author(s):

Carl G. Simon Jr., Subhadip Bodhak, Hariharan K. Iyer, Luis Fernandez de Castro Diaz, Pam Robey, Azusa Maeda, Sergei Kuznetsov

Animal models are the most biologically relevant method for measuring the osteogenic capability of bone graft formulations. However, animal experiments are...

Effect of Cellulose Nanocrystals on Crystallization Kinetics of Polycaprolactone as Probed by Rheo- Raman

September 26, 2018

Author(s):

Debjani Roy, Anthony P. Kotula, Bharath NMN Natarajan, Jeffrey W. Gilman, Douglas M. Fox, Kalman D. Migler

The development of biocompatible polymer nano-composites from renewable sources is a longstanding goal in sustainable materials. When the matrix is semi-...

On the mechanisms and the characterization of the pulsed electron grafting of styrene onto poly(tetrafluoroethylene-co-hexafluoropropylene) to synthesize a polymer electrolyte membrane

September 21, 2018

Author(s):

Byung N. Kim, Alia Weaver, Marina Chumakov, Ileana M. Pazos, Dianne L. Poster, Karen Gaskell, Do H. Han, Gunther Scherer, Michael A. Yandrasits, Byung C. Lee, Mohamad Al-Sheikhly

During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) substrate, the radiolytically-...

Influences of support layer deformation on the intrinsic resistance of thin film composite membranes

September 13, 2018

Author(s):

Masoud Aghajani, Mengyuan Wang, Lewis M. Cox, Jason P. Killgore, Alan R. Greenberg, Yifu Ding

It is commonly believed that the overall resistance of thin film composite (TFC) membranes is dictated by the crosslinked, ultrathin polyamide barrier layer,...

Atomic Force Microscopy

September 11, 2018

Author(s):

Jason P. Killgore, Teresa L. Kirschling

N/A

Flow-induced crystallization during materials extrusion additive manufacturing

September 10, 2018

Author(s):

Lily Northcutt, Sara V. Orski, Kalman D. Migler, Anthony P. Kotula

Material extrusion additive manufacturing processes force molten polymer through a printer nozzle at high (> 100 s-1) wall shear rates prior to cooling and...

Protocols for Determining the Mechanical Properties of High Strength Copolymer Aramid Fibers

September 01, 2018

Author(s):

Amanda L. Forster, Viviana Rodriguez Cardenas, Ajay Krishnamurthy, Amy E. Engelbrecht-Wiggans, Zois Tsinas

The primary goal of the manuscript is to develop a protocol to prepare consistent specimens for accurate mechanical testing of high strength copolymer aramid...

A Readily Programmable, Fully Reversible Shape Switching Material

August 24, 2018

Author(s):

Matthew McBride, Alina Martinez, Lewis M. Cox, Marvin Alim, Kimberly Childress, Michael Beiswinger, Maciej Podgorski, Brady Worrell, Jason P. Killgore, Christopher N. Bowman

Liquid crystalline elastomers (LCEs) enable large scale reversible shape changes in polymeric materials; however, they require intensive, irreversible...

Quantifying Carboxylic Acid Concentration in Model Polyamide Desalination Membranes via Fourier Transform Infrared Spectroscopy

August 21, 2018

Author(s):

Tawanda J. Zimudzi, Kathleen E. Feldman, Michael A. Hickner, Christopher M. Stafford

Carboxylic acid groups impart hydrophilicity and ionizable groups to polyamide membranes for desalination, hence influencing water and ion transport through...

Contribution of Density Functional Theory to Microporous Materials for Carbon Capture

August 06, 2018

Author(s):

Eric J. Cockayne

In this Chapter, we give a brief overview of how density functional theory (DFT) calculations have contributed to better understanding of the structure,...

Competitive solvation effects in polyelectrolyte solutions

August 01, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

An understanding of the solution properties and phase behavior of natural and synthetic polyelectrolytes requires an understanding of the competitive...

Aggregation and Solubility of a Model Conjugated Donor-Acceptor Polymer

July 31, 2018

Author(s):

Daniel R. Reid, Nicholas E. Jackson, Alexander J. Bourque, Chad R. Snyder, Ronald L. Jones, Juan de Pablo

In organic semiconductors, solution-phase polymer structure and aggregation have a strong influence on device morphology and performance. Thus, understanding...

A Comparative Study of Thermodynamic, Conformational, and Packing Properties of Bottlebrush with Star and Ring Polymer Melts

July 27, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

Thermodynamic, conformational, and structure properties of bottlebrush polymer melts are investigated with molecular dynamics simulations and compared to...

Characterization of Interfacial Structure in Polymer-Fullerene Bulk Heterojunctions via 13C {2H} Rotational Echo Double Resonance NMR

July 13, 2018

Author(s):

Ryan C. Nieuwendaal, Dean M. DeLongchamp, Martin Heeney, Jan Hummelen, Chad R. Snyder, Ronald L. Jones, Sebastian Engmann, Lee J. Richter, Zhuping Fei, Alex Sieval

We introduce a new application of solid state NMR measurements towards characterizing the donor-acceptor interfaces within bulk heterojunction (BHJ) films...

Polyelectrolyte association and solvation

July 10, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

There has been significant interest in the tendency of highly charged particles having the same charge to form dynamic clusters in solution, but an accepted...

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