Article
Chemistry, Multidisciplinary
Alejandro Sanz, Amelia Linares, Mari Cruz Garcia-Gutierrez, Aurora Nogales, Sandra Paszkiewicz, Agata Zubkiewicz, Anna Szymczyk, Tiberio A. Ezquerra
Summary: This article presents an experimental study on the relaxation dynamics of random copolymers based on bio-friendly comonomers. The study shows that these copolymers have interesting gas barrier properties, with lower dynamic fragility compared to popular polyesters used in industry. The efficient chain packing of the amorphous phase in these copolymers contributes to their low permeability to gases.
FRONTIERS IN CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Bing Yuan, Bruce G. Aitken, Derrick C. Kaseman, Ping Yu, Sabyasachi Sen
Summary: The atomic structure of glass along the P4Se3-As4Se3 join with different compositions was studied using various spectroscopic techniques. The results showed the coexistence of cage-like molecular moieties and corner-shared network moieties in these glasses. The increase in substitution of As with P correlated with an increase in the ratio of molecules to network, which also affected the glass transition temperature.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Naoki Yamamoto, Maiko Kofu, Kenji Nakajima, Hiroshi Nakagawa, Naoya Shibayama
Summary: The research found that protein dynamics are not coupled with hydration water dynamics, and unfreezable hydration water is essential for activating protein dynamics. This decoupling of dynamics between unfreezable and freezable hydration water could explain the distinct contributions of hydration water to protein dynamics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Jacob M. Lovi, Sabyasachi Sen
Summary: The effects of atomic mass on molar volume, glass transition temperature T-g, and viscosity in glassy and supercooled B2O3 liquids are investigated using boron isotope substitutions. The results show that the molar volume decreases and T-g and viscosity increase with the substitution of lighter B-10 isotopes with heavier B-11 isotopes. The observed effects are attributed to the higher zero-point vibrational energy of the lighter isotope, which leads to a longer equilibrium inter-atomic distance and larger mean-square displacement compared to the heavier isotope. The isotope effect on viscosity is more pronounced near T-g, consistent with elastic models of viscous flow and shear relaxation.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jan Pille, Antonio Aloi, Duc H. T. Le, Ilia Vialshin, Nathalie van de Laar, Kirsten Kevenaar, Maarten Merkx, Ilja K. Voets, Jan C. M. van Hest
Summary: This study introduces a novel pathway-dependent assembly method based on stimulus-responsive polymers, which can form monodisperse and stable polymeric particles under specific heating conditions. This method shows high efficiency in encapsulating cargo, such as fluorescent proteins and bioluminescent enzymes, and maintaining their function within cells.
Article
Materials Science, Multidisciplinary
Hicret Kirtay, Sahin Yakut, Deniz Deger, Kemal Ulutas, Nergis Arsu
Summary: This study presents an easy and one-step in-situ synthesis method of a rare e-Fe2O3 polymorph in a polymer matrix with different concentrations of Fe3+ salt. The results show that the char yield of the nanocomposites can be increased by adjusting the synthesized nanoparticle concentration and achieving a good distribution. SEM images confirm the formation of e-Fe2O3 nanoparticles in the polymer matrix. The dielectric spectroscopy analysis reveals a critical ratio between 4% and 8% Fe3+ salt loading, while the nanocomposite with 20% e-Fe2O3 nanoparticles exhibits excess free charges contributing to additional conduction.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Physics, Condensed Matter
Yuxing Guo, Xiao Jin, Li-Min Wang
Summary: In this study, the Debye relaxation and structural relaxations of 4-methyl-2-pentanol were investigated using dielectric spectroscopies under high pressures. The results showed that the ratios of relaxation strength and relaxation time between the Debye and structural dynamics decreased upon compression, which is contrary to previous studies on other alcohols. This study provides insights into the differences observed in the relaxation behaviors of different alcohols.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Biochemistry & Molecular Biology
Andrzej Nowok, Wioleta Cieslik, Joanna Grelska, Karolina Jurkiewicz, Natalina Makieieva, Teobald Kupka, Jose Aleman, Robert Musiol, Sebastian Pawlus
Summary: The surprising stability of supercooled liquid phase in Schiff base compounds, even under high-pressure conditions, and the atypical self-organization into lasting centrosymmetric dimers through bifurcated hydrogen bonds have been revealed. General rules governing ambient- and high-pressure molecular dynamics and near-glass transition phenomena have been derived for the family of glycine imino esters. Particularly, a mathematical formula to predict and tune the glass transition temperature and its pressure coefficient has been derived.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
J. Zareba, J. Jenczyk, M. Dobies, M. Makrocka-Rydzyk, A. Wozniak-Braszak, M. Jarek, M. Jancelewicz, M. Banaszak
Summary: Self-assembly of block copolymers is crucial for bottom-up patterning in the fabrication of nanostructured membranes and devices. Polystyrene-b-poly(ethylene oxide) (PS-b-PEO) diblock copolymer is extensively studied to understand its structure and dynamics. The interphase at the interface of crystallite-amorphous and inter-domain regions plays a significant role in determining the properties of the system. Experimental techniques like dielectric and nuclear magnetic resonance spectroscopies reveal the presence of amorphous PEO occupying interfacial sites and the asymmetrical nature of the PS-PEO interface.
Article
Physics, Fluids & Plasmas
U. Buchenau
Summary: The shear misfit model is used to study highly viscous flow and predicts the terminal stage of the flow. It also provides insight into density fluctuations and the relationship between adiabatic and isothermal compressibility jumps at the glass transition.
Article
Physics, Fluids & Plasmas
Makina Saito, Masayuki Kurokuzu, Yoshitaka Yoda, Makoto Seto
Summary: In this study, a hidden JG-beta process in glycerol was discovered through quasielastic scattering experiments. The relaxation times of local motions in glycerol were found to decouple from the timescale of the diffusion process and exhibit the behavior of the JG-beta process, as revealed by time-domain interferometry.
Article
Multidisciplinary Sciences
Anthony C. Bishop, Glorise Torres-Montalvo, Sravya Kotaru, Kyle Mimun, A. Joshua Wand
Summary: The authors propose BARASA, an approach for assigning backbone triple resonance spectra of proteins. The algorithm uses Bayesian statistical analysis and inter-spin connectivities from triple resonance spectroscopy to identify the optimal resonance assignments. BARASA outperforms current algorithms, especially in cases of sparse data, and can be evaluated in real-time during data acquisition.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Yanan Zhao, Jiaojiao Hu, Shan-Shan Yang, Jing Zhong, Jianping Liu, Shuo Wang, Yuzhuo Jiao, Fang Jiang, Ruiyang Zhai, Bingnan Ren, Hua Cong, Yuwei Zhu, Fengtong Han, Jixian Zhang, Yue Xu, Zhiwei Huang, Shengnan Zhang, Fan Yang
Summary: In this study, the authors report the discovery of a redox switch for AcrIIC1, which regulates the protein's structure transition and inhibitory activity on Cas9. By replacing the key redox-sensitive amino acids, they generated a more stable and efficient variant, providing insights for the design of CRISPR-Cas systems.
NATURE COMMUNICATIONS
(2022)
Article
Polymer Science
Michele Dai, Evangelos Georgilis, Guillaume Goudounet, Bertrand Garbay, Jan Pille, Jan C. M. van Hest, Xavier Schultze, Elisabeth Garanger, Sebastien Lecommandoux
Summary: This study reports the design and study of an ELP diblock library based on ELP-[M1V3-i]-[I-j], which showed a thermal phase transition with three distinct regimes by selectively oxidizing methionines of ELP-[M1V3-i] within the different diblocks structures.
Article
Chemistry, Physical
Shigeru Sakamoto, Takumi Houya, Takamichi Matsuno, Atsushi Shimojima
Summary: In this study, a simple and scalable method was reported to prepare uniform and unprecedentedly small silica nanoparticles (2 nm in size) through the evaporation-induced self-assembly of silicate species and surfactants in a rotary evaporator. Surface modification was achieved by direct silylation of the mesostructured composite with organochlorosilanes. The thermal stability of the nanoparticles was significantly improved by modifying the surface with dimethylsilyl groups. These silica nanoparticles prepared using this method have promising applications in emerging fields.
CHEMISTRY OF MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Michael Ryan Hansen, Robert Graf, Hans Wolfgang Spiess
Article
Chemistry, Multidisciplinary
Yu-Chun Wu, Pawaret Leowanawat, Hao-Jan Sun, Benjamin E. Partridge, Mihai Peterca, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Goran Ungar, Chain-Shu Hsu, Paul A. Heiney, Virgil Percec
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Article
Chemistry, Multidisciplinary
Benjamin E. Partridge, Pawaret Leowanawat, Emad Aqad, Mohammad R. Imam, Hao-Jan Sun, Mihai Peterca, Paul A. Heiney, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Goran Ungar, Virgil Percec
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Article
Polymer Science
Oliver Neudert, Miriam Reh, Hans W. Spiess, Kerstin Muennemann
MACROMOLECULAR RAPID COMMUNICATIONS
(2015)
Article
Chemistry, Applied
Oliver Neudert, Carlos Mattea, Siegfried Stapf, Miriam Reh, Hans W. Spiess, Kerstin Muennemann
MICROPOROUS AND MESOPOROUS MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
Cecile Roche, Hao-Jan Sun, Pawaret Leowanawat, Fumito Araoka, Benjamin E. Partridge, Mihai Peterca, Daniela A. Wilson, Margaret E. Prendergast, Paul A. Heiney, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Goran Ungar, Virgil Percec
Article
Polymer Science
Almudena Fernandez, M. Teresa Exposito, Begona Pena, Ruddiger Berger, Jie Shu, Robert Graf, Hans W. Spiess, Rafael A. Garcia-Munoz
Article
Biochemical Research Methods
Dirk Graafen, Maria Belen Franzoni, Laura M. Schreiber, Hans W. Spiess, Kerstin Muennemann
JOURNAL OF MAGNETIC RESONANCE
(2016)
Article
Chemistry, Multidisciplinary
Dipankar Sahoo, Mihai Peterca, Emad Aqad, Benjamin E. Partridge, Paul A. Heiney, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Virgil Percec
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2016)
Article
Polymer Science
In-Sun Jung, Young Joo Lee, Daun Jeong, Robert Graf, Tae-Lim Choi, Won-Joon Son, Xavier Bulliard, Hans Wolfgang Spiess
Article
Chemistry, Applied
Ming-Shou Ho, Benjamin E. Partridge, Hao-Jan Sun, Dipankar Sahoo, Pawaret Leowanawat, Mihai Peterca, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Goran Ungar, Paul A. Heiney, Chain-Shu Hsu, Virgil Percec
ACS COMBINATORIAL SCIENCE
(2016)
Article
Polymer Science
Anne Bohle, Dmytro Dudenko, Nils Koenen, Daniel Sebastiani, Sybille Allard, Ullrich Scherf, Hans Wolfgang Spiess, Michael Ryan Hansen
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2018)
Article
Polymer Science
Hans Wolfgang Spiess
Article
Chemistry, Multidisciplinary
Benjamin E. Partridge, Li Wang, Dipankar Sahoo, James T. Olsen, Pawaret Leowanawat, Cecile Roche, Henrique Ferreira, Kevin J. Reilly, Xiangbing Zeng, Goran Ungar, Paul A. Heiney, Robert Graf, Hans W. Spiess, Virgil Percec
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Dipankar Sahoo, Mihai Peterca, Emad Aqad, Benjamin E. Partridge, Paul A. Heiney, Robert Graf, Hans W. Spiess, Xiangbing Zeng, Virgil Percec