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Search Publications by: Bulent Akgun (Assoc)

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Displaying 1 - 15 of 15

Swelling of Star Polymer Thin Films Exposed to Supercritical Carbon Dioxide

March 14, 2024
Author(s)
Ayse Caglayan, Sushil Satija, David Uhrig, Kunlun Hong, Tadanori Koga, Bulent Akgun
Impact of polymer chain architecture on the swelling of supported single-layer polymer thin films with thicknesses below 80 nm in the presence of supercritical CO2 (scCO2) is investigated using in-situ neutron reflectivity (NR) and exsitu x-ray

Tailoring Biomimetic Phosphorylcholine-Containing Block Copolymers as Membrane-Targeting Cellular Rescue Agents

September 9, 2019
Author(s)
Jia-Yu Wang, Wei Chen, Michihiro Nagao, Phullara Shelat, Brenton A. G. Hammer, Gregory T. Tietjen, Kathleen Cao, J. Michael Henderson, Lilin He, Binhua Lin, Bulent Akgun, Mati Meron, Shuo Qian, Sarah Ward, Jeremy D. Marks, Todd Emrick, Ka Yee C. Lee
Some synthetic polymers have been found capable of rescuing injured cells from death by targeting cell membranes. However, general principles for designing synthetic polymers to ensure strong, but non-disruptive cell membrane targeting unknown. Here, we

Water is a Poor Solvent for Densely Grafted Poly(ethylene oxide) Chains: A Conclusion Drawn from a Self-Consistent Field Theory-Based Analysis of Neutron Reflectivity and Surface Pressure-Area Isotherm Data

May 22, 2012
Author(s)
Hoyoung Lee, Dae Hwan Kim, Kevin N. Witte, Kimberly Ohn, Je Choi, Bulent Akgun, Sushil K. Satija, You-Yeon Won
By using a combined experimental and theoretical approach, a model poly(ethylene oxide) (PEO) brush system, prepared by spreading a poly(ethylene oxide)-poly(n-butyl acrylate) (PEO-PnBA) amphiphilic diblock copolymer onto an air-water interface, was

Structure of [C 4 mpyr][NTf 2 ] Room-Temperature Ionic Liquid at Electrified Gold Interfaces

April 19, 2012
Author(s)
Yansen Lauw, Michael D. Horne, Theo Rodopoulos, Vera Lockett, Bulent Akgun, William A. Hamilton, Andrew R. J. Nelson
The structure of l-butyl=l-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C 4mpyr][NTf 2]) room-temperature ionic liquid at an electrified gold interface was studied using neutron reflectometry, cyclic voltammetry, and differential capacitance

Neutron Reflectometry and QCM-D Study of the Interaction of Cellulases with Films of Amorphous Cellulose

May 9, 2011
Author(s)
Gang Cheng, Zelin Liu, Jaclyn K. Murton, Michael Jablin, Manish Dubey, Jaroslaw Majewski, Candice Halbert, James Browning, John F. Ankner, Bulent Akgun, Chao Wang, Alan R. Esker, Kenneth L. Sale, Blake. Simmons, Michael S. Kent
Improving the efficiency of enzymatic hydrolysis of cellulose is one of the key technological hurdles to reduce the cost of producing ethanol and other transportation fuels from lignocellulosic material. A better understanding of how soluble enzymes

Variations in Cross-link Density with Deposition Pressure in Ultrathin Plasma Polymerized Benzene and Octafluorocyclobutane Films

September 1, 2010
Author(s)
Someswara R. Peri, Brian Habersberger, Bulent Akgun, Hao Jiang, Jesse Enlow, Timothy J. Bunning, Charles Majkrzak, Mark D. Foster
For ultrathin, plasma polymerized (PP) films, variations in structure with depth near the substrate and near the surface are much more readily apparent than in thick films. Neutron reflectometry (NR) measurements of ultrathin PP-films from

Solvent Retention In Thin Spin-Coated Polystyrene And Poly(Methyl Methacrylate) Homopolymer Films Studied By Neutron Reflectometry

January 19, 2010
Author(s)
Xiaohua Zhang, Kevin G. Yager, Shuhui Kang, Nathaniel J. Fredin, Bulent Akgun, Sushil K. Satija, Jack F. Douglas, Alamgir Karim, Ronald L. Jones
We utilize neutron reflectometry (NR) to probe the amount of residual solvent inside thin polystyrene (PS) and poly(methyl methacrylate) (PMMA) films spin-coated from deuterated toluene polymer solutions onto silicon substrates . The effect of thermal

Impact of polymer modulus on water accumulation at polymer / metal oxide interfaces

April 1, 2009
Author(s)
Alper Karul, Kar T. Tan, Christopher C. White, Donald L. Hunston, Steve marshall, Bulent Akgun, Sushil K. Satija, Christopher Soles, Bryan D. Vogt
Ambient moisture is known to accumulate at the interface between polymers and metal oxides, leading to detrimental consequences on physical properties such as modulus and adhesion. Direct measurement of the interfacial profile has utilized neutron

Surface Dynamics of "Dry" Homopolymer Brushes

February 10, 2009
Author(s)
Bulent Akgun, Gokce Ugur, Jianqiang Zhang, Suresh Narayanan, Sanghoon Song, Heegu Lee, William J. Brittain, Hyunjung G. Kim, Sunil K. Sinha, Mark Foster
The dynamics of the surface height fluctuations on layers of covalently tethered, nearly monodisperse polymer chains synthesized by atom transfer radical polymerization were studied using x-ray photon correlation spectroscopy. The data reveal that both
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