Article
Chemistry, Multidisciplinary
Sophia Y. Chan, Mayank Jhalaria, Yucheng Huang, Ruipeng Li, Brian C. Benicewicz, Christopher J. Durning, Thi Vo, Sanat K. Kumar
Summary: Polymer-grafted nanoparticle membranes show unexpected gas transport enhancements, but the structural origins of this behavior are unclear. This study measured and interpreted data on grafted nanoparticles and found that as the graft molecular weight increases, the gas transport enhancement decreases.
Article
Energy & Fuels
Shan Wu, Weinan Luo, Sidong Fang, Zheng Sun, Shuhui Yan, Yaohui Li
Summary: This paper correlates the nanoconfined methane adsorption behavior with the wettability effect for the first time, providing a theoretical framework and research tool for elucidating the methane adsorption mechanism in nanopores.
Article
Mechanics
Martin Zatloukal, Jiri Drabek
Summary: The monomeric friction coefficient for fully aligned chains was determined for three linear isotactic polypropylene melts, showing a significant reduction compared to the equilibrium friction coefficient. This supports the argument that a reduction in the friction coefficient is necessary to understand the dynamics of polymer melts in very fast flows, as suggested by recent rheological data and molecular simulations.
Article
Polymer Science
Clemens Kastner, Dominik Altmann, Eva Kobler, Georg Steinbichler
Summary: This study introduces a novel measurement die for characterizing the flow behavior of gas-containing polymer melts, providing near-process measurement of viscosity and resolving issues related to pressure and desorption. By comparing different correction methods and conducting measurements on polypropylene with blowing agents, it was found that gases had a low impact on melt viscosity. The die, when combined with ultrasound sensors, offers an innovative method for measuring volumetric flow rate, representing an important advancement in improving the sustainability of gas-containing polymer processing.
Article
Chemistry, Physical
Alexander Ya Malkin, Igor' Gumennyi, Ali D. Aliev, Anatoly E. Chalykh, Valery G. Kulichikhin
Summary: The study analyzed the evolution of the morphology of two incompatible polymer melts in a capillary flow using analytical electron microscopy. The spatial distribution and orientation of the polymers were found to be minimally affected by the specified shear rate, with a thin boundary layer formed by the low-viscosity LC polymer being the only significant change observed.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Multidisciplinary
Wenjie Yu, Guancheng Shen, Yun Zhang, Dequn Li, Huamin Zhou
Summary: A proposed molecular configuration evolution model for polymer melts can accurately describe the rheological properties, especially at high shear rates. The predicted results in rotary Couette flow agree well with the measured dielectric anisotropy results.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Thermodynamics
Weikang Fan, Yuanhui Ji
Summary: This study proposed a modified friction theory (f-theory) combined with perturbed-chain statistical association fluid theory (PC-SAFT) to model the dynamic viscosity of polymer melts under high pressure and shear rate. Viscosity data points were collected and analyzed, with the modified f-theory showing good modeling performance based on fitting to experimental viscosity data.
FLUID PHASE EQUILIBRIA
(2021)
Article
Chemistry, Physical
Siqi Zhang, Huafu Pei, Michael Plotze, Haochen Ying
Summary: Accurate prediction of hydraulic conductivity in soils is crucial for evaluating pollutant transport and designing radioactive waste disposal. Previous research focused on macroscopic seepage behavior, neglecting the microscopic seepage behavior, leading to discrepancy between predictions and measurements. This paper uses molecular dynamics simulations to investigate water flow characteristics in soil mesopores and develops a modified Kozeny-Carman equation based on the results. The proposed equation shows better performance in predicting hydraulic conductivity of clays compared to the classical equation.
APPLIED CLAY SCIENCE
(2022)
Article
Polymer Science
Katsumi Hagita, Takahiro Murashima, Naoki Sakata, Koya Shimokawa, Tetsuo Deguchi, Erica Uehara, Susumu Fujiwara
Summary: We investigated the topological barriers in ring polyethylene (PE) melts of trefoil knots and found that these barriers prevent crystallization due to self-entanglement. The topological barriers decrease with increasing polymer chain length (N) and the knotted segments are localized in the noncrystallized region. Our study provides insights into the effects of topology on crystallization in polymer melts.
Article
Polymer Science
Zhixing Huang, Yashasvi Bajaj, Jan-Michael Y. Carrillo, Yohei Nakanishi, Kiminori Uchida, Kazuki Mita, Takeshi Yamada, Tsukasa Miyazaki, Bobby G. Sumpter, Maya Endoh, Tadanori Koga
Summary: The interface between the polymer matrix and carbon fiber (CF) in carbon fiber reinforced polymers (CFRPs) significantly affects the macroscopic properties of CFRPs. This study characterized the bound polymer layer (BPL) on the CF surface using experimental and simulation techniques, and found that the crystallinity of the BPL was lower than the bulk, and the bound chains exhibited faster dynamics and formed a high-density region near the CF surface.
Article
Mechanics
Karen Y. Perez-Salas, Gabriel Ascanio, Leopoldo Ruiz-Huerta, Juan P. Aguayo
Summary: An analytical approximation for the flow of a linear Phan-Thien-Tanner model fluid through an axisymmetric semi-hyperbolic contraction is presented in this study. The semi-analytical solution proposed can accurately represent the exponential version of the viscoelastic model. The flow model equations for both linear and exponential Phan-Thien-Tanner models are solved with the consideration of Navier boundary conditions to account for slip at the geometry wall.
Article
Nanoscience & Nanotechnology
Navaneeth Haridasan, Sarith P. Sathian
Summary: The study investigates the anomaly in solvated protein's rotational dynamics under confinement by exploring the viscosity variation of solvent near a solid surface. As the degree of confinement increases, the confining matrix significantly influences the local viscosity of solvent molecules in the protein hydration layer, leading to enhanced drag force on protein motion. The direct matrix-protein non-bonded interaction is found to be responsible for occasional jumps and discontinuities in the protein's orientational motion under tight confinement.
Article
Polymer Science
Weizhao Ren, Yanlong Li, Yuling Tang, Jianquan Xu, Cuiyun Zhang, Ophelia K. C. Tsui, Xinping Wang
Summary: In this study, the desorption of adsorbed chains in a bilayer system was investigated using fluorine-labeled polystyrene (PS). The results showed that the exchange of PS-flattened chains with top-free chains was slower compared to PS-loose chains, and it was highly dependent on molecular weight (MW). Interestingly, in the presence of loosely adsorbed chains, the desorption of flattened chains was greatly accelerated and had weaker MW dependence. The MW-dependent desorption was attributed to the average number of contact sites between polymer adsorbed chains and the substrate, which increased rapidly with increasing MW. Additionally, the desorption of loosely adsorbed chains provided extra conformational energy to accelerate the desorption of flattened chains.
Article
Multidisciplinary Sciences
Nicola Bodini, Julie K. Lundquist, Patrick Moriarty
Summary: Long-term weather and climate observatories can be influenced by changing environments nearby, such as urban growth and vegetation changes. Wind plants can affect local atmospheric conditions through their wakes, leading to increased turbulence and accelerated wind speeds, especially in stable conditions.
SCIENTIFIC REPORTS
(2021)
Article
Construction & Building Technology
Hyunmin Yeo, Sang Lee
Summary: This study numerically investigated the turbulent wakes and recirculatory flow induced by building arrays under an atmospheric boundary layer flow to examine the influence of building arrangement on urban air mobility service. Large-eddy simulation and immersed boundary method were used to realistically mimic the atmospheric flow and the presence of building arrays. Four cases were studied, including an array of three high-rise buildings and three other combinations of high-rise and low-rise building arrays. Results showed the presence of horseshoe vortex and recirculation flows in all building configurations, with intensity varying based on the height of the upstream building. The dominant clockwise-rotating vortex was found in the cavity between the buildings. Moreover, the lateral vortex generated by the side walls of the nonuniform array tilted outward due to the secondary flow formed by the wake of the building, contributing to the downwash flow behind the building array. Elevated velocity fluctuations were observed on top of and behind the high-rise buildings, persisting downstream in parallel with the freestream flow. The largest velocity standard deviation was found to be 3.8 times that of the inflow, resulting from the combination of flow recirculation and wake from the upstream building. Velocity spectra analysis provided reference data for the deployment of vertiports and UAM take-off and landing guidance.
BUILDING AND ENVIRONMENT
(2023)
Article
Polymer Science
Naisheng Jiang, Justin M. Cheung, Yichen Guo, Maya K. Endoh, Tadanori Koga, Guangcui Yuan, Sushil K. Satija
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2018)
Article
Chemistry, Multidisciplinary
Naisheng Jiang, Mani Sen, Maya K. Endoh, Tadanori Koga, Elin Langhammer, Patrik Bjoorn, Mesfin Tsige
Article
Polymer Science
Mani Sen, Naisheng Jiang, Maya K. Endoh, Tadanori Koga, Alexander Ribbe, Atikur Rahman, Daisuke Kawaguchi, Keiji Tanaka, Detlef-M. Smilgies
Article
Chemistry, Physical
Naisheng Jiang, Mani Sen, Wenduo Zeng, Zhizhao Chen, Justin M. Cheung, Yuma Morimitsu, Maya K. Endoh, Tadanori Koga, Masafumi Fukuto, Guangcui Yuan, Sushil K. Satija, Jan-Michael Y. Carrillo, Bobby G. Sumpter
Article
Nanoscience & Nanotechnology
Tianyi Yu, Lauren T. Swientoniewsk, Marzhana Omarova, Mei-Chun Li, Loan I. Negulescu, Naisheng Jiang, Omead A. Darvish, Abhishek Panchal, Diane A. Blake, Qinglin Wu, Yuri M. Lvov, Vijay T. John, Donghui Zhang
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Polymer Science
Yuma Morimitsu, Daniel Salatto, Naisheng Jiang, Mani Sen, Shotaro Nishitsuji, Benjamin M. Yavitt, Maya K. Endoh, Ashwanth Subramanian, Chang-Yong Nam, Ruipeng Li, Masafumi Fukuto, Yugang Zhang, Lutz Wiegart, Andrei Fluerasu, Keiji Tanaka, Tadanori Koga
Article
Polymer Science
Naisheng Jiang, Tianyi Yu, Omead A. Darvish, Shuo Qian, Igor Kevin Mkam Tsengam, Vijay John, Donghui Zhang
Article
Chemistry, Physical
Mengmeng Zhang, Wenjun Zhang, Naisheng Jiang, Don N. Futaba, Ming Xu
Article
Materials Science, Multidisciplinary
Yang Wang, Jie Zuo, Naisheng Jiang, Kangmin Niu, Ying Wu
COMPUTATIONAL MATERIALS SCIENCE
(2020)
Article
Polymer Science
Naisheng Jiang, Jianxia Chen, Tianyi Yu, Albert Chao, Liying Kang, Ying Wu, Kangmin Niu, Ruipeng Li, Masafumi Fukuto, Donghui Zhang
Article
Chemistry, Multidisciplinary
Liying Kang, Albert Chao, Meng Zhang, Tianyi Yu, Jun Wang, Qi Wang, Huihui Yu, Naisheng Jiang, Donghui Zhang
Summary: The study investigates the influence of N-substituent structure on the crystalline packing and hierarchical self-assembly of diblock copolypeptoids. It reveals that the linear versus branched N-substituent architecture significantly impacts the supramolecular self-assembly of diblock copolypeptoids in solution, leading to tunable geometry and hierarchical structure of polypeptoid-based nanomaterials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Polymer Science
Siqi Huang, Jinxian Yang, Nairong Hao, Muhammad Waqas Ishaq, Jun Wang, Naisheng Jiang, Lianwei Li
Summary: This study investigates the solution behavior and topological effect of branched polymers, and finds that the hyperbranched structure can significantly suppress the aggregation tendency of the solvophobic core.
Article
Engineering, Electrical & Electronic
Zheng Chen, Xiaohua Zhang, Pei Cao, Zhuo Chao, Dandan Liu, Jingna Zhao, Jingjing Jia, Naisheng Jiang, Kangmin Niu, Qingwen Li
ACS APPLIED ELECTRONIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Naisheng Jiang, Xiaoyu Di, Daniel Salatto, Chang-Yong Nam, Masafumi Fukuto, Maya K. Endoh, Tadanori Koga
Review
Biochemistry & Molecular Biology
Brandon A. Chan, Sunting Xuan, Ang Li, Jessica M. Simpson, Garrett L. Sternhagen, Tianyi Yu, Omead A. Darvish, Naisheng Jiang, Donghui Zhang
