Article
Biology
Andrea Pica, Giuseppe Graziano
Summary: Elastin-like polypeptides (ELPs) are soluble in water at low temperature but undergo a reversible coil-to-globule collapse transition upon increasing the temperature. The addition of trimethylamine N-oxide (TMAO), glycine, or betaine to water causes a significant decrease in the collapse temperature (T(collapse)) of a specific ELP. An alternative approach based on the solvent-excluded volume effect and its temperature dependence is able to explain the ELP collapse and the lowering of T(collapse) induced by the addition of TMAO, glycine, or betaine.
Article
Chemistry, Physical
Rasika Dahanayake, Udaya Dahal, Elena E. Dormidontova
Summary: This study investigates the conformational changes of water-soluble polymers and their responsiveness to external triggers such as temperature and co-solvent addition. The results reveal that hydrogen bonding and the polymer's ability to maintain its hydration shell are crucial factors in determining the polymer's response to external triggers.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Dian Xu, Rafael A. A. Auras, Uruchaya Sonchaeng, Maria Rubino, Loong-Tak Lim
Summary: The effects of alcohol solutions on the thermomechanical properties of poly(lactic acid) (PLA) films were studied. It was found that the glass transition temperature (T-g) of PLA films decreased with increasing concentration of methanol and ethanol solutions. Propanol and butanol solutions resulted in the lowest T-g values at specific concentrations. Water and deuterium oxide (D2O) solutions had similar effects on T-g. This study provides insights for developing PLA films for use with aqueous-alcoholic solutions.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Applied
Shuai Wang, Yingying Sun, Ziye Wu, Ling Zhao, Yunlong Liu, Shuhong Li, Xiaochen Dong, Wenjun Wang
Summary: Solvent polarity significantly affects the molecular orientation and optoelectronic characteristics of thermally activated delayed fluorescence molecules. Lower solvent polarity enhances the photoluminescence intensity and horizontal orientation of the emission molecules. Optimizing solvent polarity can improve the performance of solution processed organic light-emitting diodes (OLEDs).
Article
Chemistry, Physical
Piotr Polanowski, Andrzej Sikorski
Summary: This study simulated the structure of two-dimensional polymer chains in a solvent using the Cooperative Motion Algorithm and revealed the differences compared to chain-like structures in dense polymer liquids.
Review
Mechanics
Victor Steinberg
Summary: Elastic turbulence (ET) is a chaotic flow phenomenon that occurs when a tiny amount of long polymer molecules is added to a viscous solvent laminar flow. ET is characterized by polymer stretching, which generates elastic stress and affects the flow. This review examines the statistical and spectral properties of the velocity field, pressure fluctuations, and friction factor scaling of ET in different flow geometries, based on experiments, numerical simulations, and theoretical descriptions.
ANNUAL REVIEW OF FLUID MECHANICS, VOL 53
(2021)
Article
Materials Science, Multidisciplinary
Wenjia Jiang, Liqiu Wei, Xinyong Yang, Zhou Yang
Summary: This study investigates the influence of coil structure and position on the energy coupling efficiency of a miniature radio frequency ion thruster with a diameter of 4 cm. The experimental results demonstrate that increasing the number of coil turns or decreasing the turn spacing improves thruster performance, but a too small coil-to-screen grid distance significantly reduces thruster performance. Increasing the coil turns or decreasing the turn spacing increases coil resistance and inductance, while also increasing the resistance of the plasma source, ultimately enhancing thruster performance. However, reducing the distance between the coil and screen grid enhances mutual inductance, which reduces thruster inductance and increases resistance, leading to degraded thruster performance.
Article
Chemistry, Physical
Yaran Yin, Weiyang Chen, Xingxing Zhu, Chunying Zhu, Taotao Fu, Xianming Zhang, Youguang Ma
Summary: The absorption performances of CO2 into AMP solutions mixed with water, EG, DEG, and TEG were investigated and compared in a T-junction microchannel. The results show that solvents affect the absorption rate with the order of AMP-water < AMP-EG < AMP-DEG < AMP-TEG, which is opposite to their solubility. Increased pressure drop and shorter bubble surrounded with thicker film are the dominant factors affecting the absorption rate. Under current conditions, water is a feasible solvent choice.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Mechanics
Mandi Boudaghi, M. Hadi Nafar Seddashti, Brian J. Edwards, Bamin Khomami
Summary: Dissipative particle dynamics (DPD) simulations replicate the coil-stretch transition (CST) and configurational relaxation of entangled polyethylene melts observed in planar elongational flow (PEF). The width of the CST hysteresis loop is larger for longer molecule liquids. Reducing the flow Deborah number results in a two-stage relaxation process, with initial stratification followed by configurational relaxation.
JOURNAL OF RHEOLOGY
(2022)
Article
Chemistry, Physical
Rohit Ghanta, Craig Burkhart, Patrycja Polinska, Vagelis Harmandaris, Manolis Doxastakis
Summary: In this study, we investigated the dynamics of cis and trans-polyisoprene (PI) homopolymers and copolymers using all-atom simulations. The results showed that cis-PI exhibits faster translation and reorientation modes than trans-PI, as indicated by the mean square displacement and characteristic times. However, at higher modes, trans units showed faster dynamics. Our findings provide important data for the design and optimization of PI-based materials.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Review
Polymer Science
Debashish Mukherji, Kurt Kremer
Summary: Polymeric materials are widely used in various aspects of our daily life. Smart polymers, which can undergo significant structural and functional changes in response to slight external stimuli, have attracted considerable attention. The design of lightweight high-performance organic solids with tunable properties using different interactions, especially hydrogen bonds, is a challenge. This review summarizes recent developments in the field of smart polymers and discusses their solution processing and applications in organic solids, aiming to provide a microscopic understanding for future experiments and simulations in designing advanced functional materials.
Article
Multidisciplinary Sciences
Prashant Kumar, Prakash Joshi, Jigmi Basumatary, Partha Pratim Mondal
Summary: The proposed optical flow imaging technique (VFC/iLIFE) adds new capabilities to the existing system and enables real-time monitoring and analysis of sub-cellular organelle organization. It provides 3D volume visualization, organelle-level resolution, and multi-organelle screening. This technique allows for high throughput investigation and instant volume reconstruction with organelle-level resolution of live specimens, providing valuable insights into the progression of diseases.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Analytical
Alessandro Mingotti, Federica Costa, Lorenzo Peretto, Roberto Tinarelli
Summary: Power quality evaluation assesses the deviation of power network parameters from ideal conditions. This work presents a measurement setup and specific tests for a commonly used type of low-power current transformer. The accuracy performance of the transformer was evaluated under the influence of other factors.
Article
Chemistry, Physical
Yuka Hiei, Ikuya Ohshima, Mitsuo Hara, Takahiro Seki, Taiki Hoshino, Yukikazu Takeoka
Summary: This study investigated the effects of monomer arrangement and composition for star-shaped polymers on the shrinkage behavior of polymer gels. The results showed that introducing more than 20% DMA as a block copolymer increased the shrinkage speed of the gels.
Article
Multidisciplinary Sciences
Guoying Qian, Sijie Yang, Ruonan Li, Gang Dou
Summary: The study found that the temperament of firstborn children and parenting styles have a significant impact on their psychological adjustment in Chinese two-child families, with authoritarian parenting partially mediating the relationship between approach or withdrawal and psychological adjustment.
SCIENTIFIC REPORTS
(2022)
Article
Mechanics
Chandi Sasmal, Kai-Wen Hsiao, Charles M. Schroeder, J. Ravi Prakash
JOURNAL OF RHEOLOGY
(2017)
Article
Mechanics
Kai-Wen Hsiao, Chandi Sasmal, J. Ravi Prakash, Charles M. Schroeder
JOURNAL OF RHEOLOGY
(2017)
Article
Physics, Fluids & Plasmas
Ranganathan Prabhakar, Chandi Sasmal, Duc At Nguyen, Tam Sridhar, J. Ravi Prakash
PHYSICAL REVIEW FLUIDS
(2017)
Article
Mechanics
Sharadwata Pan, Duc At Nguyen, B. Duenweg, P. Sunthar, T. Sridhar, J. Ravi Prakash
JOURNAL OF RHEOLOGY
(2018)
Article
Chemistry, Physical
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
JOURNAL OF CHEMICAL PHYSICS
(2018)
Review
Chemistry, Physical
J. Ravi Prakash
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2019)
Article
Mechanics
Sharadwata Pan, Duc At Nguyen, P. Sunthar, T. Sridhar, J. Ravi Prakash
KOREA-AUSTRALIA RHEOLOGY JOURNAL
(2019)
Article
Biophysics
Kiran Kumari, Burkhard Duenweg, Ranjith Padinhateeri, J. Ravi Prakash
BIOPHYSICAL JOURNAL
(2020)
Article
Mechanics
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
Summary: In this study, a coarse-grained bead-spring-dashpot chain model with internal friction was solved numerically to obtain material functions in different flow conditions. Simulation results were compared with semi-analytical approximations, showing a decrease in prediction discrepancy with increasing number of beads. The inclusion of internal friction resulted in nonmonotonous variations of viscosity with shear rate.
JOURNAL OF RHEOLOGY
(2021)
Article
Mechanics
Aritra Santra, B. Duenweg, J. Ravi Prakash
Summary: A multiparticle Brownian dynamics simulation algorithm is used to describe the static behavior of associative polymer solutions considering pairwise excluded volume interactions. Predictions for the fractions of stickers bound by intrachain and interchain associations are obtained and validated by systematic comparison with scaling relations. The simulations confirm the predictions of scaling theory across a wide range of parameter values.
JOURNAL OF RHEOLOGY
(2021)
Article
Biophysics
Kiran Kumari, J. Ravi Prakash, Ranjith Padinhateeri
Summary: Chromatin is highly dynamic and shows cell-to-cell variability, playing a crucial role in gene regulation and DNA replication. By deriving interaction-strength parameters from experimental data, the organization and dynamics of chromatin can be predicted. Heterogeneous weak interactions are found to be crucial in determining the organization of chromatin domains.
BIOPHYSICAL JOURNAL
(2022)
Article
Chemistry, Physical
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
Summary: The Rouse model with internal friction (RIF) is an approximate treatment based on preaveraging internal friction, while an exact coarse-grained model incorporating fluctuations in internal friction differs in predictions from RIF model, especially in shorter chain segments. The predictions for chain extension and viscosity in shear flow show qualitative differences between the two models, indicating variations in out-of-equilibrium conditions.
Article
Physics, Multidisciplinary
R. Kailasham, Rajarshi Chakrabarti, J. Ravi Prakash
PHYSICAL REVIEW RESEARCH
(2020)
Article
Mechanics
I Pincus, A. Rodger, J. Ravi Prakash
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2020)
Article
Chemistry, Physical
Aritra Santra, Kiran Kumari, Ranjith Padinhateeri, B. Duenweg, J. Ravi Prakash