Article
Engineering, Environmental
Tian-Dan Lu, Liu-Lin Zhao, Wai Fen Yong, Qian Wang, Lei Duan, Shi-Peng Sun
Summary: The study introduces a novel strategy of fabricating an insoluble polyimide nanofibrous substrate through sequential electrospinning polyamic acid followed by thermal imidization, resulting in thin-film nanofibrous composite (TFNC) membranes with high permeability, rejection, and stability in water and polar aprotic solvents.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Jong-Heon Yang, Chun-Won Byun, Jae-Eun Pi, Hee-Ok Kim, Chi-Sun Hwang, Seunghyup Yoo
Summary: This study improved memory erase speed in amorphous oxide semiconductor memory thin-film transistor (TFT) by introducing new double-gate and body-contacted memory structures.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Jonathan Charleston, Arpit Agrawal, Yao Zhao, Reza Mirzaeifar
Summary: The development of flexible film/substrate composite systems is a promising strategy to enhance the functionality of sub-micron NiTi thin films. Polyimide foils provide advantages as lightweight, flexible, and durable substrates. However, the properties and behavior of NiTi films deposited on polyimides remain poorly understood.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Physical
Dongfeng Zheng, Guo Tian, Yadong Wang, Wenda Yang, Luyong Zhang, Zoufei Chen, Zhen Fan, Deyang Chen, Zhipeng Hou, Xingsen Gao, Qiliang Li, Jun-Ming Liu
Summary: In this study, the controlled manipulation of conductive domain walls in epitaxial BiFeO3 thin films was demonstrated using piezoresponse force microscopy and conductive atomic force microscopy. It was also found that nanoscale domains surrounded by highly conductive circular charged domain walls can be created and erased through the application of local field using a conductive probe.
JOURNAL OF MATERIOMICS
(2022)
Article
Physics, Applied
Puhao Chai, Jun Zhu, Jiale Chen
Summary: A charge trapping memory with high-k nanocrystal-amorphous phase structure was fabricated. Numerous charge traps were generated at the phase interface, significantly increasing the charge trapping capability. The device demonstrated a larger memory window and excellent stability.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Wenzhong Zhang, Haruka Komatsu, Shingo Maruyama, Kenichi Kaminaga, Yuji Matsumoto
Summary: This study proposes the use of an ionic liquid crystal as a resistive switching layer in nonvolatile ReRAM devices, achieving low set voltage and stable switching behavior. The successful operation is attributed to the liquid crystal phase and the electric double layers formed at the electrode-ILC interfaces.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Andrey L. Didenko, Aleksey Gennad'evich Ivanov, Valentina E. Smirnova, Gleb V. Vaganov, Tatyana S. Anokhina, Ilya L. Borisov, Vladimir V. Volkov, Alexey V. Volkov, Vladislav V. Kudryavtsev
Summary: A novel method for fabricating films based on non-soluble polymers was proposed in this study. By selectively decomposing soluble blocks, an insoluble polyimide film was successfully obtained. The polymeric films obtained by controlled decomposition showed good solvent resistance and similar properties to the homopolymer.
Article
Materials Science, Multidisciplinary
Jimin Han, Boyoung Jeong, Yuri Kim, Joonki Suh, Hongsik Jeong, Hyun-Mi Kim, Tae-Sik Yoon
Summary: This study demonstrates the non-charge-storage-based nonvolatile memory characteristics associated with oxygen ion exchange. The modulation of channel conductance occurs through the exchange of oxygen ions between the indium-zinc oxide (IZO) channel and the oxygen-deficient HfO2-x gate oxide. The device shows nonvolatile retention properties and has potential for non-charge-storage-based nonvolatile memory application.
MATERIALS TODAY ADVANCES
(2022)
Review
Engineering, Manufacturing
Dhiraj Narayane, Ravindra Taiwade, Khemraj Sahu
Summary: This review article discusses the development of SMA/polyimide thin-film composites using various physical vapor deposition techniques, including their actuation characteristics, the influence of actuation controlling parameters, and the life cycle behavior. The feasibility of these composites in various applications and their potential use in soft robotic technology is also examined.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Sin-En Li, Guan-Zhang Lu, Ji-Lin Shen, Meng-Jer Wu, Yu-Ting Chen, Mujahid Mustaqeem, Yang-Fang Chen
Summary: This study presents a first attempt to achieve multifunctional nonvolatile memory based on all 2D heterostructures, demonstrating long-term stability and nonvolatile characteristics under both optical and electrical control signals.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
C. Zhang, D. Li, P. T. Lai, X. D. Huang
Summary: This study investigates a new type of charge-trapping nonvolatile memory (NVM) that has the same structure as a thin-film transistor (TFT). The NVM uses metal-hydroxyl (M-OH) defects in the back channel for charge storage. Devices with different M-OH content were prepared by changing thermal treatment. The high M-OH content device shows good NVM performance, while the low M-OH content device exhibits good TFT characteristics.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Chemistry, Analytical
Tianning Liu, Ajay Dangi, Jeong Nyeon Kim, Sri-Rajasekhar Kothapalli, Kyusun Choi, Susan Trolier-McKinstry, Thomas Jackson
Summary: This study presents flexible thin-film lead zirconate titanate (PZT)-based ultrasonic transducers on polyimide substrates that exhibit strong performance for underwater applications.
Article
Materials Science, Coatings & Films
Edyta Kobierska, Stanislav Zak, Sabrina Hirn, Megan J. Cordill, Robert Franz, Marisa Rebelo de Figueiredo
Summary: In this study, the tribological properties of Mo films deposited on polyimide substrates were assessed using the ball-on-disc test. The wear mechanisms and induced stresses were analyzed by microscopy and simulation, providing insights into the tribological response of metallic films on compliant substrates.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Kelly Liang, Xin Xu, Yuchen Zhou, Xiao Wang, Calla M. McCulley, Liang Wang, Jaydeep Kulkarni, Ananth Dodabalapur
Summary: A redesign of the TFT device structure is necessary to achieve higher levels of speed and performance. Nanospike-shaped electrodes can assist charge injection and form charge nanoribbons, resulting in improved TFT characteristics. This design paradigm shows promise for boosting TFT performance in flexible/printed electronics applications.
Article
Chemistry, Multidisciplinary
Kandammathe Valiyaveedu Sreekanth, Rohit Medwal, Yogesh Kumar Srivastava, Manukumara Manjappa, Rajdeep Singh Rawat, Ranjan Singh
Summary: The study demonstrates dynamic color generation using electrically tunable thin film optical coatings consisting of two different phase change materials. These coatings excite Fano resonance through structural phase switching, covering the entire visible spectrum and showing wide applications in tunable displays and active nanophotonic devices.
Article
Chemistry, Applied
Ye Seol Choi, Si Eun Kim, Mi Ran Ha, Jin Chul Kim, Hyun-jong Paik, Sang-Ho Lee, Young Il Park
Summary: The research aims to achieve dual-curing reaction at low temperature using metal acetylacetonates to promote radical and urethane reactions. Analysis showed that Mn(acac)(3) is the best catalyst that can maintain surface properties even at low curing temperatures.
PROGRESS IN ORGANIC COATINGS
(2021)
Review
Chemistry, Analytical
Seema Thakral, Kyungtae Kim
Summary: Small-angle scattering (SAS) is a versatile analytical technique that provides detailed structural information at the nanometer scale. It has diverse applications in pharmaceutical material characterization, including identification of liquid-crystalline mesophase of drugs, study of excipient microstructure influence, and optimization of solid dispersions and protein-based therapeutics formulations.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2021)
Article
Polymer Science
Alireza Bandegi, Kyungtae Kim, Reza Foudazi
Summary: This study investigates the impact of morphology and segmental dynamics on ion transport in polymerized lyotropic liquid crystals. The research highlights that grain size and chain density at the interface are important factors affecting ion conduction in polyLLCs. The study demonstrates that reducing chain density enhances interaction between IL and polymer chains, leading to slower relaxation of the polymer chains. Additionally, confinement in the LLC structure prolongs the relaxation of polymer chains compared to homopolymer/IL mixtures.
JOURNAL OF POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Si Eun Kim, Hyun Ji Yang, Soonyoung Choi, Eunbyul Hwang, Minseong Kim, Hyun-Jong Paik, Ji-Eun Jeong, Young Il Park, Jin Chul Kim, Byeong-Su Kim, Sang-Ho Lee
Summary: This study successfully conducted metal-free cationic ring-opening polymerization using tris(pentafluorophenyl)borane (BCF) as a catalyst, resulting in well-controlled branched cyclic polyglycidol (BC-PGD) structure. By operating in nonpolar solvents and achieving a recycling polymerization process under ambient conditions with unpurified reagents, a phase separation of PGD with uniform molecular weight distribution was achieved.
Article
Polymer Science
Si Eun Kim, Yu-Ri Lee, Minseong Kim, Eunyong Seo, Hyun-Jong Paik, Jin Chul Kim, Ji-Eun Jeong, Young Il Park, Byeong-Su Kim, Sang-Ho Lee
Summary: Controlling the topology of a polymer is crucial for determining its physical properties and processing. In this study, a synthetic approach using a frustrated Lewis pair was proposed to obtain highly tunable hyperbranched polyglycidol. The results showed that different Lewis bases led to different polymer topologies. By investigating the relationship between the polymer topology and its properties, important theoretical insights were provided for controlling polymer topology.
Article
Chemistry, Multidisciplinary
Hyang Moo Lee, Jun Hee Heo, Jin Chul Kim, Jin Joo, In Woo Cheong
Summary: In this study, Eu2+ and Dy3+ doped strontium aluminates were encapsulated with ultra-thin polymeric layers using layer-by-layer and coacervation methods, resulting in improved water-resistant performance. The coacervation method achieved a higher retention of photoluminescence intensity (93.5%) compared to the layer-by-layer method. Additionally, the pH values of the coacervation-encapsulated phosphors were lower than those of the pristine phosphor.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
Su Min Yun, Hyang Moo Lee, Sana Ahmed, Gi Young Kim, Jin Chul Kim, In Woo Cheong
Summary: This study investigated the effects of diisocyanates on the reversibility of Hindered-urea bonds (HUBs) and HUB-bearing polymers. It was found that the reversibility of the HUB increases as the order of isocyanate group increases, and the self-healing efficiency also follows the same order.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Materials Science, Multidisciplinary
Da Hae Son, Hyoung Eun Bae, Mi Ju Bae, Sang-Ho Lee, In Woo Cheong, Young Il Park, Ji-Eun Jeong, Jin Chul Kim
Summary: In this study, a self-healing automotive clearcoat based on a reversible polymer network and a photothermal dye was designed and demonstrated excellent self-healing performance and high transparency under sunlight irradiation.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Applied
Anam Saddique, Hyang Moo Lee, Jin Chul Kim, Jinhye Bae, In Woo Cheong
Summary: The development of low-temperature self-healing polymers is essential for maintaining their mechanical strength. In this study, cellulose nanocrystal (CNC)/polymer nanocomposites were successfully prepared by blending grafted CNC and matrix prepolymer. The nanocomposites exhibited excellent self-healing efficiency at low temperature and demonstrated robust mechanical properties.
CARBOHYDRATE POLYMERS
(2022)
Article
Materials Science, Multidisciplinary
Sana Ahmed, Mi Ju Bae, Subin Jeong, Ju Hyun Lee, Jin Chul Kim, Young Il Park, In Woo Cheong
Summary: This study successfully synthesized an emulsion polymer with self-healing capability based on a dynamic covalent bonding mechanism. The synthesis and properties of the polymer were confirmed through various analyses. The effects of drying and crosslinking conditions on film formation and properties were also evaluated.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Younes Saadat, Kyungtae Kim, Reza Foudazi
Summary: In this study, a two-step thermoresponsive ultrafiltration membrane was fabricated using a polymerized liquid crystal material. The membrane exhibited reversible thermoresponsive behavior at specific temperatures, enhancing cleaning efficiency and extending product lifespan.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ji-Eun Jeong, Jae-Won Lee, Mi Ju Bae, Hyoung Eun Bae, Eunjeong Seo, Seulchan Lee, JungYeop Shin, Sang-Ho Lee, Yu Jin Jung, Hyocheol Jung, Young Il Park, Hak-Rin Kim, In Woo Cheong, Jin Chul Kim
Summary: Recently, self-healing materials have gained attention for their ability to recover specific functions in various systems. In this study, polythiourethane dynamic networks containing a photothermal dye were designed for self-healing protection coatings in vision systems. The optimized coating exhibited high transmittance, tunable refractive index, and self-healing capability through a dynamic reaction. The coating's self-healing performance was demonstrated on a lens protector, showing perfect restoration of distorted light signals.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Subin Jeong, Giyoung Kim, Hyoungeun Bae, Hyeokjin Kim, Eunjeong Seo, Sujeong Choi, Jieun Jeong, Hyocheol Jung, Sangho Lee, Inwoo Cheong, Jinchul Kim, Youngil Park
Summary: Wastewater management is important for the dyeing industry. Digital textile printing (DTP) is explored as a method for printing colorants onto fabric without generating wastewater, but the use of natural fibers like cotton is desired. This study introduced a blocked isocyanate group into a newly synthesized reactive disperse dye to enhance binding to the fabric. The synthesized dye showed higher color strength and better fastness values on cotton compared to commercial dyes. The possibility of introducing isocyanate groups into reactive disperse dyes was confirmed.
Article
Materials Science, Multidisciplinary
Ehsan Behzadfar, Kyungtae Kim, Bongjoon Lee, Alex M. Jordan, Olivier Lhost, Shaffiq A. Jaffer, Frank S. Bates, Christopher W. Macosko
Summary: Multilayer coextrusion of polyethylene and polypropylene films can significantly delay dripping time and reduce the number of drips in comparison to conventional melt blends with additives. This additive-free approach provides better control over fire safety parameters in polymers.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Younes Saadat, Kyungtae Kim, Reza Foudazi
Summary: This study investigates the polymerization kinetics with different thermal initiators in various LLC structures, finding that the IFW system utilizing ammonium persulfate exhibits higher reaction rates and conversion rates compared to the IFO system using azobisisobutyronitrile and benzoyl peroxide. It is also discovered that nanoconfinement effects on polymerization rates can be minimized through the IFW system, as shown in both DSC and chemorheology results. Additionally, polymers obtained from the IFW system show improved mechanical properties compared to those from the IFO system at similar monomer conversions.
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.