Article
Physics, Multidisciplinary
Ingo Hoffmann
Summary: This paper discusses the importance of background correction in neutron spin echo measurements, reviews different methods to subtract the buffer, and studies the impact of small errors in background subtraction on results.
In the large dynamic range of modern neutron spin-echo spectrometers, multiple effects become visible in a single measurement, particularly for vesicles where membrane undulations and translational diffusion affect the intermediate scattering function. The study investigates how considering these factors differently can affect the results obtained from data analysis.
FRONTIERS IN PHYSICS
(2021)
Review
Physics, Multidisciplinary
Xiang Luo, Tengfei Cui, Xiangqiang Chu
Summary: Soft matter systems are characterized by diverse structures and properties, and the understanding of their internal structures and dynamic behaviors is crucial for elucidating the microscopic behaviors of matter. This review highlights the applications of spin-echo small-angle neutron scattering (SESANS) and high-resolution neutron spin echo (NSE) spectroscopy in the study of soft matter systems, particularly complex fluids and biomolecular systems. NSE spectroscopy provides insights into the rheological behaviors, stability, aggregation dynamics, and interactions of various soft matter systems, and contributes to the advancements in materials science, biomedicine, and chemistry.
FRONTIERS IN PHYSICS
(2023)
Article
Chemistry, Physical
Vainius Skukauskas, Ian P. Silverwood, Emma K. Gibson
Summary: Quasielastic neutron scattering was used to study the dynamics of water confined in copper-loaded MOR, MFI, and CHA zeolites at temperatures ranging from 100-300 K. The results show that the Cu content and cavity size affect the mobility of water, indicating diffusion within localized clusters.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Vainius Skukauskas, Elliot L. B. Johnson Humphrey, Iain Hitchcock, Andrew York, Joseph Kelleher, Emma K. Gibson, David J. Nelson, Ian P. Silverwood
Summary: The article introduces the method of using neutron probes to observe the progress of catalytic reactions and the recent progress and possibilities in realistic applications.
TOPICS IN CATALYSIS
(2021)
Article
Engineering, Chemical
Mayank Prakash, Anup Kumar Ghosh
Summary: This study focuses on the effects of nanoparticle fillers on foam processing of polypropylene and attempts to establish a correlation between rheology and cell size in nanocomposite foams. The study found that particle type/size is the dominant factor in determining the cell size of the foam. The decrease in viscosity and storage modulus leads to smaller and more stable cells during foaming.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
O. Holderer, S. Maccarrone, S. Pasini, M-S Appavou, A. Gelissen
Summary: Composites consisting of PNIPAM microgels and silica nanoparticles have been investigated, showing the formation of raspberry-like core-shell structures.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Shang Gao, Ganesh Pokharel, Andrew F. May, Joseph A. M. Paddison, Chris Pasco, Yaohua Liu, Keith M. Taddei, Stuart Calder, David G. Mandrus, Matthew B. Stone, Andrew D. Christianson
Summary: This study uses spectral graph theory to approximate spiral spin liquids on a bipartite lattice and broadens the range of candidate materials that may support spiral spin liquid phases. Neutron scattering experiments on two compounds demonstrate the feasibility of this new approach and reveal potential limitations in experimental realizations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Shang Gao, Michael A. McGuire, Yaohua Liu, Douglas L. Abernathy, Clarina dela Cruz, Matthias Frontzek, Matthew B. Stone, Andrew D. Christianson
Summary: Using neutron scattering, a spiral spin liquid has been realized in the van der Waals honeycomb magnet FeCl3. A continuous ring of scattering is directly observed, indicating the emergence of an approximate U(1) symmetry in momentum space.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Maximilian Jansen, Fanni Juranyi, Olesya Yarema, Tilo Seydel, Vanessa Wood
Summary: This study investigates the dynamics of different surface-bound alkanethiols in lead sulfide nanocrystal solids using temperature-dependent, quasielastic neutron scattering (QENS). The research reveals that the ligands can undergo different types of motion, with varying activation energies and percentages of motion types depending on the specific characteristics of the ligands.
Article
Polymer Science
Matthew Laskoski, Boris Dyatkin, Naresh C. Osti, Jong K. Keum, Eugene Mamontov, Tristan Butler
Summary: By blending TPEB and Res resins, we can obtain thermosets with high char retention and low viscosity, which are beneficial for composite manufacturing. Our study on the dynamics and material properties during thermal curing provides insights into understanding and controlling this complex mechanism.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Physics, Condensed Matter
Fabrizia Foglia, Sandrine Lyonnard, Victoria Garcia Sakai, Quentin Berrod, Jean-Marc Zanotti, Gerard Gebel, Adam J. Clancy, Paul F. McMillan
Summary: Understanding transport mechanisms, implementing neutron scattering techniques, and combining different methods are crucial for designing and implementing advanced membrane technologies for fuel cells and separation devices.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Applied
M. Majidian, A. Magrez, L. Forro, Y. Leterrier
Summary: The addition of RGO nanoparticles can significantly increase the viscosity of composites, while low concentration RGO suspensions exhibit marked shear thinning behavior and yield stress.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Jingjing Lin, Daria Noferini, Emmanouil Veroutis, Carsten Korte, Olaf Holderer
Summary: In this study, the proton dynamics of a protic ionic liquid with residual water were investigated using PFG-NMR and QENS techniques, revealing different relaxation processes and quantifying proton fractions for hopping or vehicular motions. The study identified hopping and vehicular motions of water on picosecond and nanosecond time scales respectively, and cooperative transport of active protons and vehicle transport of PIL cations on millisecond time scale. The diffusion coefficients obtained by NMR and QENS techniques were discussed in detail.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Ignacio Martin-Fabiani, Stavros X. Drakopoulos, Giuseppe Forte, Sylvain Prevost, Ingo Hoffmann, Sara Ronca
Summary: The study using neutron spin echo spectroscopy revealed that graphene oxide hinders chain dynamics in polyethylene melt. The proposed model allows for measurement of adsorbed and free polymer fractions, as well as the thickness of the adsorbed layer. The experiments provided evidence at the nanoscopic level of graphene oxide hindering entanglement formation in the polymer melt.
Article
Materials Science, Multidisciplinary
Arun Parthasarathy, Egecan Cogulu, Andrew D. Kent, Shaloo Rakheja
Summary: This study discusses the precession and stability of the Neel order of antiferromagnets subjected to spin torque, focusing on the requirements for in-plane and normal components of spin polarization. The precessional motion is described as a damped-driven pendulum with hysteresis, showing critical values and frequency dependencies on the spin current.
Article
Chemistry, Physical
Yanqin Zhai, Peng Luo, Jackson Waller, Jeffrey L. Self, Leland W. Harriger, Antonio Faraone
Summary: The dynamics of molecular associates in a methanol/water mixture were investigated, revealing a slower nanoscale diffusion process compared to single particle diffusion. Long-lived dynamic molecular associations of water and methanol molecules were found, influencing the viscosity of the mixtures to be higher than that of pure components.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Biomedical
Mertcan Han, Erdost Yildiz, Humeyra Nur Kaleli, Selcan Karaz, Guncem Ozgun Eren, Itir Bakis Dogru-Yuksel, Erkan Senses, Afsun Sahin, Sedat Nizamoglu
Summary: Optoelectronic biointerfaces integrated with hydrogels enable efficient, flexible, stable, biocompatible, and safe photostimulation of cells, holding great promise for next-generation wireless neural and cardiac implants.
ADVANCED HEALTHCARE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Recep Bakar, Saeid Darvishi, Tianyu Li, Mertcan Han, Umut Aydemir, Sedat Nizamoglu, Kunlun Hong, Erkan Senses
Summary: The use of nonlinear PEO in PEO/PMMA blends leads to a significant increase in their ionic conductivity by enhancing the decoupling of PMMA and PEO segmental dynamics, ultimately improving the performance of the electrolytes. Macromolecular architecture can serve as a tool to decouple segmental dynamics and ion mobility, allowing for the rational design of SPEs with improved performance.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Chemical
Isik Sena Akgun, Enis Demir, Murat Isik, Nadin Ekmekciyan, Erkan Senses, Can Erkey
Summary: Alginate aerogel particles were successfully coated with a copovidone and hydroxypropyl cellulose based polymer in a Wurster fluidized bed. The results indicate that the pores of aerogels were not damaged during the process. Changing bed temperature led to significant changes in coating thickness whereas both bed temperature and atomizing pressure affected coating layer surface morphology. The smoothest coating layer surface and the highest coating efficiency were achieved at 50 degrees C with 1.7 bar atomizing pressure.
Article
Multidisciplinary Sciences
Peng Luo, Yanqin Zhai, Peter Falus, Victoria Garcia Sakai, Monika Hartl, Maiko Kofu, Kenji Nakajima, Antonio Faraone, Y. Z
Summary: The relaxation behavior of glass formers at different microscopic length scales exhibits different characteristics, and the length scale dependence is important for understanding the collective relaxation dynamics in glass-forming liquids.
NATURE COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
Changwoo Do, Rana Ashkar, Cristina Boone, Wei-Ren Chen, Georg Ehlers, Peter Falus, Antonio Faraone, Jason S. Gardner, Van Graves, Thomas Huegle, Reika Katsumata, Darian Kent, Jiao Y. Y. Lin, Bill McHargue, Bradley Olsen, Yangyang Wang, Danielle Wilson
Summary: EXPANSE is an expanded angle neutron spin echo instrument designed to address scientific problems involving high-energy resolution in dynamic processes. It offers wide coverage in scattering wavenumbers and Fourier times, and provides unique capabilities for simultaneous measurement of slow dynamics and time-resolved spectroscopic studies.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Polymer Science
Ali H. Slim, Winnie H. Shi, Farshad Safi Samghabadi, Antonio Faraone, Amanda B. Marciel, Ryan Poling-Skutvik, Jacinta C. Conrad
Summary: We investigate the structure and dynamics of unentangled semidilute solutions of sodium polystyrenesulfonate (NaPSS) using small-angle neutron scattering (SANS) and neutron spin-echo (NSE) spectroscopy. The effects of electrostatic interactions and chain structure are examined as a function of ionic strength and polymer concentration, respectively. The study reveals characteristic structural peak, two scaling behaviors, and suppressed chain dynamics.
Article
Biochemistry & Molecular Biology
Selcan Karaz, Mertcan Han, Gizem Akay, Asim Onal, Sedat Nizamoglu, Seda Kizilel, Erkan Senses
Summary: Understanding the interaction between biological membranes and extracellular matrices is crucial for controlling cell behavior and functions. This study investigates how the viscoelastic extracellular environment modifies the dynamics of lipid membranes. The results show a dynamic coupling between polymer chains and phospholipid bilayers, with the lipid bilayer viscosity directly influenced by the relaxation of the whole chain.
Review
Engineering, Biomedical
Selcan Karaz, Erkan Senses
Summary: The targeted delivery of drugs without damaging healthy tissues is a challenge in drug delivery systems. Stimuli-responsive materials, such as shear-sensitive liposomes, have been investigated to address this issue. Shear-sensitive materials can be categorized into shear-disaggregated and shear-deformed nanoparticles based on their structural changes under high-shear stress. Liposomes, with their soft and deformable structure, high biocompatibility, controlled-release properties, and sensitivity to shear stress, show promise as drug carriers. This review discusses the effects of shear stress on liposomes, including structural changes, flow regimes, rheological properties, and drug delivery applications, providing a basis for designing more effective drug delivery systems in the human body.
ADVANCED NANOBIOMED RESEARCH
(2023)
Article
Polymer Science
Selcan Karaz, Gizem Akay, Ismail C. Karaoglu, Mertcan Han, Sedat Nizamoglu, Seda Kizilel, Erkan Senses
Summary: Shear forces play a significant role in cellular processes and are particularly important in cardiovascular diseases. Although various stimuli have been explored for on-demand release, developing drug delivery systems that respond to physiological-level shear stresses is challenging. Liposomes embedded in hydrogel matrices offer a promising solution as they can dynamically interact with their surroundings. However, understanding the interaction between liposomes and hydrogels, as well as their response to shear forces, is crucial for optimal drug delivery systems.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Recep Bakar, Saeid Darvishi, Umut Aydemir, Ugur Yahsi, Cumali Tav, Yusuf Ziya Menceloglu, Erkan Senses
Summary: This study systematically investigated the effects of polymer architecture and salt concentration on the properties of PEO-based polymer electrolytes. The results showed that branching of PEO can improve ion coordination and increase the ionic conductivity. Highly branched polymers exhibited significantly higher ionic conductivity compared to linear polymers. The addition of salt in the highly branched architectures resulted in accelerated yet similar monomeric friction coefficients, offering potential for enhancing battery performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Meeting Abstract
Biophysics
Selcan Karaz, Erkan Senses
BIOPHYSICAL JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Eren Kushan, Erkan Senses
Summary: Cellulose nanocrystals and temperature responsive Pluronic F127 were used to create composite hydrogels with varying concentrations of CNC, leading to changes in micellization and gelation behavior. At low concentrations, the composite gel became softer and more deformable, while at high concentrations, the CNC formed its own network to increase toughness. The composite gels showed potential for smart drug delivery systems and adaptive biolubricants.
ACS APPLIED BIO MATERIALS
(2021)
