Article
Polymer Science
Zhicheng Chang, Yafei Wang, Zhiyu Zhang, Ke Gao, Guanyi Hou, Jianxiang Shen, Liqun Zhang, Jun Liu
Summary: The study explores the impact of nanoparticle filling fraction and interaction strength between polymer chains and nanoparticles on the creep behavior of polymer nanocomposites using coarse-grained molecular dynamics simulation. Results show that increasing filler volume fraction and interaction strength enhance the creep resistance of PNCs, with the presence of single-chain bridge structures contributing to improved creep performance. Understanding these factors can provide guidelines for manipulating the creep mechanics of PNCs.
Article
Polymer Science
Saeid Darvishi, Erkan Senses
Summary: Polymer nanocomposites (PNCs) are widely used in advanced materials applications and the large fraction of interfacial polymers in PNCs determines their rheological performance. However, strategies to control the structure and dynamics of interfacial polymers are limited. In this study, we propose a facile approach to alter polymer-NP interaction and chain interpenetration in PNCs by changing the macromolecular architecture of interfacial polymers. Our results show that the dispersion and rheological behavior of PNCs depend on the functionality and arm length of the polymers used at the interfaces. These findings can be utilized to design improved molten polymer electrolytes for solid-state battery applications.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Bo-Young Lee, Seoungju Park, Dae-Won Chung, Keon-Soo Jang
Summary: This study examined the dispersity of silica nanoparticles (SNPs) in hydrophilic epoxy and hydrophobic polystyrene (PS) matrices, finding that alkyl-functionalized SNPs were more uniformly dispersed in the PS matrix. Among the different alkyl chains, propyl-functionalized SNPs exhibited the most homogeneous dispersion, leading to enhanced mechanical properties. Additionally, the smallest diameter SNPs (60 nm) showed slight enhancement in mechanics and dispersion compared to larger diameter SNPs (120 and 180 nm).
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Composites
Jingkai Liu, Xichen Jia, Yuan Liu, Yishun Wuliu, Jinyue Dai, Xinbei Zhu, Xiaoqing Liu
Summary: In this study, a strategy utilizing polar groups in MXene and purposefully constructed hydrogen bonds was employed to prepare Ti3C2Tx MXene/PBZ composites, achieving homogeneous dispersion of nanosheets and significant enhancement in properties.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Spectroscopy
Mahsa Mohammadi, Mohammadreza Khanmohammadi Khorrami, Hamid Vatanparast, Hossein Ghasemzadeh
Summary: An analytical method using ATR-FTIR spectroscopy and chemometric methods was proposed for the quantitative determination of surface tension of anionic surfactant solutions in the presence of hydrophilic silica nanoparticles. The addition of silica nanoparticles with different sizes significantly alters the surface tension behavior of anionic surfactant solutions. Support vector machine regression and partial least squares regression were used for surface tension prediction, with SVM-R found to be reliable due to the complexity of the samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Polymer Science
Alexander L. Kwiatkowski, Vyacheslav S. Molchanov, Alexander I. Kuklin, Yuri M. Chesnokov, Olga E. Philippova
Summary: This study investigates the structural transformation of charged hybrid surfactant/polymer micelles induced by salt concentration. The results show that small salt concentration leads to the formation of beads-on-string aggregates on polymer chains, while the addition of KCl transforms these aggregates into rods. The presence of the polymer delays the transition from spheres to rods at higher salt concentrations. The rods formed in the hybrid system are shorter than those in the polymer-free surfactant solution, indicating the stabilization of the semi-spherical endcaps by the embedded polymer. The study also reveals the localization of the polymer within the aggregates.
Article
Chemistry, Multidisciplinary
Smriti Mukherjee, Ganesh Shanmugam
Summary: In this study, a novel reverse surfactant, Fm-GPO, with a short hydrophobic head group and a long hydrophilic tail, was designed and demonstrated for the first time at physiological pH. Self-assembly of Fm-GPO into spherical vesicles with a large hydrophilic area was promoted by pi-pi stacking of the fluorenyl moieties and intermolecular hydrogen bonding between the peptide chains. This Fm-GPO system provides a new class of surfactants with unique features that can be used for the design of drug-loaded vehicles, which can be target-specific by manipulating the peptide chain with different functional ultra-short peptide sequences.
Article
Chemistry, Physical
Xuening Feng, Huanyu Liu, Hanjun Liu, Xuebin Jiang, Liwei Shen, Yuqi Tang, Qian Qu, Dong Xiang, Xuemin Yan, Yuanzhu Mi
Summary: A new type of ionic liquid demulsifier, HDEA-TFA, with both hydrophilic and hydrophobic chains, was synthesized and identified with its chemical structure. It showed excellent demulsifying ability for two water-in-crude oil (W/O) emulsions with different ratios. The influences of demulsification conditions on the demulsifying efficiency (DE) were discussed, and the results indicated that HDEA-TFA could achieve 100% DE within 120 minutes at a concentration of 500 mg/L and a temperature of 60℃. Moreover, HDEA-TFA exhibited remarkable resistance to acidity, alkalinity, and salinity. The demulsifying mechanism was investigated through various measurements, and this study provided a reference for further research on demulsification mechanisms.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Characterization & Testing
Razieh Beigmoradi, Abdolreza Samimi, Davod Mohebbi-Kalhori
Summary: The controllability of morphology and wettability behavior of polysulfone electrospun nanofiber mats (ENMs) was investigated by adding surfactants, which affected the diameter size, hydrophilicity or hydrophobicity, surface roughness, and chemical composition of the ENMs. Different types of surfactants had varying effects on the properties of the nanofiber mats, with changes observed in contact angle, surface roughness, and diameter.
Article
Engineering, Biomedical
Parathan Ramamurthi, Zhongchao Zhao, Eamonn Burke, Nicole F. Steinmetz, Markus Mullner
Summary: Nanoparticle-based drug delivery systems show promise in cancer therapy, with superior selectivity and tumor accumulation compared to small-molecule therapeutics. This study examines the role of molecular polymer bottlebrushes (MPBs) as potential drug delivery vehicles, specifically focusing on the influence of hydrophobicity levels on cell association and tumor homing. The results demonstrate that increasing hydrophobicity in MPBs leads to enhanced tumor accumulation and homing, highlighting the importance of hydrophilic-hydrophobic balance in MPB composition.
ADVANCED HEALTHCARE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Md Saifuddin, Arindam Biswas, Saugata Roy, Subhankar Mandal, Satyajit Hazra
Summary: Polymer nanocomposites (PNCs) consisting of Au nanoparticles (AuNPs) incorporated in semiconducting polymers (SPs) were studied. The dispersion and locations of the AuNPs, as well as the crystallinity of the SPs, were found to affect the device performances. The results showed that the AuNPs self-organized near the film interfaces and diffused through the amorphous regions of P3HT during thermal annealing, leading to improved crystallinity and connectivity of P3HT.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Dara Nguyen, Melinda Desse, Corinne Jegat
Summary: This study investigates the influence of introducing oily liquid in a polyethylene-co-octene and polyethylene oxide polymer blend prepared in the molten state. The phase in which the oil stays is mainly driven by surface tension, while viscosity influences the mobility of the oil through the phases.
Article
Polymer Science
Haohui Huo, Jie Liu, Senthil Kannan, Long Chen, Yimin Zhao, Lei Zhang, Gang Chang, Qilu Zhang, Feng Liu
Summary: This study presents the first example of protein-like multicompartment nanoparticles formed via self-assembly of a specifically designed 21-arm star polymer, PEG(PAA-b-PS)(20). The morphology of the MCNs is determined by the volume ratio of PS to PAA, and unique string structures composed of one-dimensional alignment of single-star polymers were observed for the first time. A new mechanism for the assembly of star polymers was proposed based on investigations under different conditions, suggesting potential applications in drug delivery and catalysis.
Article
Environmental Sciences
Takahiro Suzuki, Masayuki Yamane, Tohru Nishioka, Yuko Nukada, Osamu Morita
Summary: The sustainable anionic surfactant Bio IOS exhibits excellent water solubility and high surface activity due to its unique structure with long hydrophobic alkyl chains and internal hydrophilic groups. Environmental fate and ecotoxicity studies showed high biodegradability and moderate toxicity, with the presence of hydrophilic groups influencing toxicity levels. The hydroxyl group and internal positions of hydrophilic groups in the molecular configuration may reduce adverse effects on organisms despite long alkyl chains.
Article
Thermodynamics
Zhibing Zhu, Xuan Zhang, Yugang Zhao, Xiaoyang Huang, Chun Yang
Summary: The freezing characteristics of deposited water droplets on aluminum surfaces were investigated experimentally and theoretically compared with those of sessile droplets. The results showed differences in freezing behavior and frozen shapes between deposited and sessile droplets, depending on surface temperature and wettability.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Materials Science, Ceramics
Takuma Takahashi, Fumika Sakamoto, Junichi Tatami, Motoyuki Iijima
Summary: In situ observation of the internal structure evolution during sintering of Al2O3 green bodies using swept-source optical coherence tomography revealed changes in the density distribution and growth of coarser pores. This technique allows real-time monitoring of sintering behavior, providing insights into the development of ceramics with superior properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Physical
Motoyuki Iijima, Naoya Taki, Junichi Tatami
Summary: This study hypothesized that the real particle dynamics during shearing could be effectively revealed by combining macroscopic flow curve measurements, OCT observation, and AFM measurement. Experimental results showed that suspensions may exhibit different microscopic flow modes during flow curve measurements depending on the complexation of fatty acids to PEI.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Tsukaho Yahagi, Daisuke Kawai, Takuma Takahashi, Motoyuki Iijima, Junichi Tatami
Summary: This study investigated the electrical resistivity of Si3N4 ceramics with Yb2O3 additive by applying various voltages at different temperatures. The addition of Yb2O3 led to a lower resistivity in the Si3N4 ceramics, which decreased with increasing temperature and applied voltage. Hopping conduction through the J-phase was found to be the main reason for the decrease in resistivity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Ryota Sato, Tsukaho Yahagi, Junichi Tatami, Motoyuki Iijima
Summary: A new method for rapid manufacturing of transparent SiO2 glass components using a hybridized 3D structuring approach has been reported. The method involves photo-curing, green machining, fast debinding/sintering process, and the use of interparticle photo-cross-linkable suspensions. The study demonstrates that this method can produce highly transparent SiO2 glass components with improved mechanical properties and green machinability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Motoyuki Iijima, Ryoya Arita, Yoko Fujishiro, Taichi Furukawa, Shoji Maruo, Junichi Tatami
Summary: The relationships between the processing methods of photocurable SiO2 suspensions, powder dispersion states, material processability, and the structural changes of photocured SiO2 bodies during their sintering into transparent glass components were investigated. The effects of the differences in the particle dispersion states on the real-time multi-scaled structural changes of photocured bodies during sintering were elucidated. The in-line transparency of the sintered SiO2 material was consistent with those of the microstructures observed using OCT.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi, Tsukaho Yahagi
Summary: In this study, high-transparency α-SiAlON ceramics were fabricated by adding various rare-earth oxides, and their effects on transparency and fluorescence were investigated. The use of Ho2O3 as an additive resulted in the lowest light scattering and highest in-line transmittance. These transparent α-SiAlON ceramics also exhibited fluorescence corresponding to different rare-earth ions.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Yoshihiko Yamanoi, Junichi Tatami, Motoyuki Iijima
Summary: A new series of Pickering emulsions that can be photo-cured by interparticle photo-cross-linking reactions using small amounts of multifunctional acrylate (MA) monomers is proposed to rapidly manufacture complex-structured porous ceramic materials.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yuki Otsuka, Isao Yamamoto, Motoyuki Iijima, Junichi Tatami
Summary: This study investigated the sintering behavior of green bodies molded under a strong magnetic field using the master sintering curve (MSC) theory. The results showed that the green bodies molded with a magnetic field had higher apparent activation energy during sintering and more consistent grain orientation compared to those without a magnetic field.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Kohei Aminaka, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi
Summary: In this study, transparent alpha-SiAlON:Ce3+ ceramics were successfully fabricated using gas-pressure sintering technique, with Lu-alpha-SiAlON:Ce3+ ceramics displaying higher transparency and blue shift in maximum emission wavelength compared to Y-alpha-SiAlON:Ce3+ ceramics. Lower Ce concentration resulted in increased transparency and blue shift in maximum emission wavelength.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Taiki Maruyama, Masaru Mukai, Ryota Sato, Motoyuki Iijima, Mitsuki Sato, Taichi Furukawa, Shoji Maruo
Summary: This study demonstrates the production of heterogeneous 3D-printed objects with different mechanical and optical properties by controlling the microphase-separated structures through copolymerization and varying scanning speeds in a laboratory-constructed laser-scanning micro-stereolithography system. The ability to control the physical properties of 3D-printed parts has potential for functionalizing microdevices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Ceramics
Yuki Otsuka, Isao Yamamoto, Motoyuki Iijima, Junichi Tatami
Summary: Wet-jet milling of a slurry can achieve highly oriented hydroxyapatite ceramics with anisotropy in fracture toughness.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Mariko Minami, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi, Tatsuki Ohji
Summary: This study investigated the behavior of crack formation during the dewaxing process using two types of Al2O3 green bodies added with different organic binders. It was found that the type of the binder significantly affected the crack initiation and deformation behaviors of the green bodies.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Mami Tanabe, Junichi Tatami, Motoyuki Iijima, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano, Tatsuki Ohji
Summary: The yield stress and fracture strength of beta-Si3N4 single crystals were measured by bending tests of microcantilever beam specimens. The yield stress depended on the crystal orientation, and the plastic deformation resulted from dislocations in the primary slip system {101 over bar 0}$\{ 10\bar{1}0\} $. The fracture strength ranged approximately up to 20 GPa, depending on the crystal orientation, and the fracture behavior was discussed in terms of the accumulation of dislocations.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Fumiya Ito, Takuya Honda, Haruka Komuro, Fumitaka Yoshikawa, Junichi Tatami, Motoyuki Iijima
Summary: The flowing behavior of concentrated aqueous TiO2 suspensions was analyzed by studying the structure of polymeric dispersants, their adlayer thickness on particle surface, and particle concentrations. The results showed hysteresis characteristics of the suspension flow curves when the steric repulsive force of the polymer dispersant dominated the van der Waals attractive forces. The particle concentration dependency of the suspension viscosities followed a unified trend when the concept of relative surface distance was introduced.
Article
Materials Science, Ceramics
Hiromasa Kuroda, Junichi Tatami, Motoyuki Iijima, Takuma Takahashi
Summary: In the wet forming of ceramics, it is important to control the cracking and deformation of the ceramic slurry during drying. This study developed a combined system of OCT and TG for real-time observation of the internal structural changes in a drying SiO2 slurry. The observations revealed significant changes in OCT signal intensity due to the Brownian motion of SiO2 particles in the early stages of drying. The slurry exhibited shrinkage, loss of fluidity, and agglomeration of ceramic particles, leading to crack formation in localized dry regions.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2023)
