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Displaying 1 - 25 of 1498

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...

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...

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...

Stoichiometric analysis of hydrogen bonding interactions in a mixture of cross-linking resin monomers

June 27, 2018

Author(s):

Seungwan Ryu, Xiaohui Liu, Ying Jin, Jirun Sun, Young J. Lee

We investigate multiple hydrogen bonding interactions in a binary mixture of cross-linking resin monomers: urethane dimethacrylate (UDMA) and triethylene...

Oxidation Reactions in Kink Bands Regions of UHMMPE Fiber-Based Laminates Used in Body Armor: A Mechanistic Study

May 29, 2018

Author(s):

Zois Tsinas, Amanda L. Forster, Mohamad I. Al-Sheikhly

This work demonstrates the synergy between the thermo-mechanical induced degradation and the oxidation reactions in the kink-banded areas of ultra-high molar...

Equilibrium Free Energies from Non-Equilibrium Trajectories with Relaxation Fluctuation Spectroscopy

May 28, 2018

Author(s):

David J. Ross, Elizabeth A. Strychalski, Christopher Jarzynski, Samuel M. Stavis

Recent advances in non-equilibrium statistical mechanics and single-molecule measurements have enabled the determination of equilibrium free energies from non-...

Energy Renormalization Method for the Coarse-Graining of Polymer Viscoelasticity

May 10, 2018

Author(s):

Jake Song, David D. Hsu, Kenneth R. Shull, Frederick R. Phelan Jr., Jack F. Douglas, Wenjie Xia, Sinan Keten

Developing time and temperature transferable coarse-grained (CG) models is essential for the computational prediction and design of polymeric glass-forming...

Short-time dental resin biostability and kinetics of enzymatic degradation

May 09, 2018

Author(s):

Xiaohong Wang, Sheng Song, Lei Chen, Christopher M. Stafford, Jirun Sun

Resin biostability is an important concern regarding the durability of methacrylate-based dental resin restorations. Current resin biostability evaluation...

Hierarchical Cellulose Nanocrystal Blends for Bioinspired Damage Tolerant Photonic Films

May 04, 2018

Author(s):

Bharath NMN Natarajan, Ajay Krishnamurthy, Caglar Dogu Emiroglu, Amanda L. Forster, E. J. Foster, Christoph Weder, Douglas M. Fox, Jan Obrzut, Jeffrey W. Gilman

Attempts to emulate strong and tough natural composites using wood cellulose nanocrystals (CNCs) fall short in mechanical performance due to the low shear...

The Evolution of Polystyrene as a Cell Culture Material: A Brief History

April 10, 2018

Author(s):

Max J. Lerman, Josephine Lembong, Shinichiro Muramoto, John G. Gillen, John P. Fisher

Polystyrene (PS) has brought in vitro cell culture from its humble beginnings to the modern era, propelling dozens of research fields along the way. This...

Functional Group Quantification of Polymer Nanomembranes with Soft X-rays

March 15, 2018

Author(s):

Daniel F. Sunday, Edwin P. Chan, Sara V. Orski, Ryan C. Nieuwendaal, Christopher M. Stafford

Paper in electronic and optoelectronic devices

March 06, 2018

Author(s):

Dongheon Ha, Zhiqiang Fang, Nikolai B. Zhitenev

The demand for lightweight, cost-effective, and/or flexible electronic and optoelectronic devices drives research toward new materials advancing the desired...

Influence of Polymer and Ion Solvation on Conformational Properties of Flexible Polyelectrolytes

March 02, 2018

Author(s):

Alexandros Chremos, Jack F. Douglas

The study of the coupling between the conformational properties of a polyelectrolyte chain and the distribution of counter-ions surrounding the chain is...

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