Article
Chemistry, Multidisciplinary
Chenyang Wang, Shujuan Ma, Yinmao Wei, Junjie Ou
Summary: The study focuses on the use of cationic surfactant hexadecyl trimethyl ammonium bromide and co-surfactant octadecylamine to improve the stability of Pickering emulsions and arrange micron-sized silica particles at the toluene-water interface through electrostatic interaction. Organosilane reagents are also added to construct asymmetric hydrophilic or hydrophobic mesoporous onto the silica particles surface. The cation surfactant-assisted Pickering emulsion method is simple and effective, making it applicable for the synthesis of dual Janus silica particles for specific applications.
Article
Chemistry, Physical
Binbin Yang, Lu Xu, Yang Liu, Baijun Liu, Mingyao Zhang
Summary: In this study, monodisperse polystyrene microspheres with sulfonic acid or carboxyl groups were prepared using soap-free emulsion polymerization (SFEP). The addition of hydrophilic comonomers improved the stability of the microspheres and promoted particle nucleation, resulting in smaller sizes with less particle aggregation.
COLLOID AND POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Yongjuan Zhu, Guangfeng Wu
Summary: In this study, a one-step method for the preparation of monodispersed nanoparticles using soap-free emulsion polymerization with sodium p-styrene sulfonate as ionic comonomer was achieved. The experimental results showed that the particle number increased with NaSS concentration, reaching a maximum at 10 wt% NaSS concentration, resulting in the smallest particle size nanoparticles. Furthermore, the particle size distribution gradually narrowed during the polymerization reaction.
COLLOID AND POLYMER SCIENCE
(2021)
Article
Chemistry, Applied
Lei Dong, Shuaishuai Dai, Guangling He, Haizhou Zhao, Liangmin Yu, Li Wang
Summary: In this study, lipophilic monomer tackifying hydrogel with good adhesion ability on organic substrates was successfully prepared by soap-free emulsion polymerization. The hydrogel exhibited considerable inhibitory ability on biological attachment in a real marine environment.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Physical
Edina Rusen, Alexandra Mocanu, Raluca Somoghi, Daniela C. Culita, Raul Augustin Mitran, Adrian Dinescu, Andreea Matei, Aurel Diacon
Summary: This study synthesized a terpolymer containing styrene, acrylic acid, and N-(isopropyl acrylamide) using a soap-free emulsion process, and investigated the influence of AA/NiPAM ratio on reaction mechanism and kinetics. Different polymerization mechanisms were confirmed for AA-rich and NiPAM-rich substrates through various analyses, with the formation of two distinct types of polymer particles observed at higher NiPAM concentrations. The stability of the latexes and the humidity responsive characteristics of the obtained PCs were also evaluated for potential applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Cen Li, Wei Cheng, Zhangyin Yan, Shengsong Ge, Qian Shao, Nithesh Naik, Duo Pan, Zhanhu Guo
Summary: The addition of CNTs to S-A greatly improves the performance of the composite material, including reducing curing temperature, increasing electrical conductivity, tensile strength, and Young's modulus, as well as improving water resistance.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Biao Huang, Xinjin Ge, Boris Y. Y. Rubinstein, Xianchun Chen, Lu Wang, Huiying Xie, Alexander M. M. Leshansky, Zhenzhen Li
Summary: By using gas-assisted coflow step-emulsification, uniform and high-production rate micron- and submicron-sized droplets can be produced, which have wide applications in biomedical diagnosis and drug delivery. The method utilizes air as the innermost phase, gradually diffusing out to form oil droplets, following the scaling laws of triphasic step-emulsification for droplet size and oil layer thickness.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Polymer Science
Bing Zhu, Henmei Ni
Summary: This study investigated the polymerization of styrene using different methods (batch, in situ seeded, stepwise dosing, and normal seeded) and analyzed the effect of the initiator on the reaction and the properties of the polymer. The results showed the presence of auto-accelerative effect in the polymerization process under different reaction conditions. Additionally, the GPC curves of the seeds and particles changed with the polymerization method and monomer addition.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Katsuhiro Onita, Miku Onishi, Taro Omura, Takeshi Wakiya, Toyoko Suzuki, Hideto Minami
Summary: Monodisperse bio-based polymer particles were prepared through dispersion polymerization. The particle size can be controlled by changing the composition of the reaction medium or PVP concentration. 100% bio-based PMBL particles were also prepared using hydrolyzed PMBL as a colloidal stabilizer.
Article
Chemistry, Multidisciplinary
Mengwei Huo, Yi Guo, Xinbo Wang
Summary: In this study, an ordered micron-sized macroporous PI film was efficiently fabricated using PAA-b-PS copolymer with a specific volume fraction of PS, where the synergistic effect of hydrogen bonds and pi-pi interactions played a pivotal role.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mengwei Huo, Yi Guo, Xinbo Wang
Summary: An ordered micron-sized macroporous polyimide film was efficiently fabricated through the synergistic effect of hydrogen bonding and pi-pi interaction.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Polymer Science
Edina Rusen, Aurel Diacon, Raul-Augustin Mitran, Adrian Dinescu, Cristina Nistor, Raluca Somoghi, Aurelian Cristian Boscornea, Doina Manaila-Maximean
Summary: This study synthesized and characterized nano encapsulated liquid crystals in polymer particles, highlighting the encapsulation of E7 and its properties. The results showed potential applications of nano encapsulated liquid crystals in enhancing liquid crystal fluorescence responses.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Marta Antoniv, Sehoon Chang, Nouf Al-Jabri, S. Sherry Zhu
Summary: The study demonstrated that nanoparticles synthesized through a hybrid flow-to-batch process have smaller particle size, tighter size distribution, higher molecular weight, and lower molecular weight distribution compared to conventionally batch-synthesized nanoparticles. The flow-to-batch synthesized nanoparticles also show more hydrophilic acrylamide segments on the particle surface. The results suggest that a flow synthesis process can improve nanoparticle quality and simplify the scale-up process in a conventional chemistry lab.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Amorn Chaiyasat, Sawitree Sue-eng, Laurent Billon, Masayoshi Okubo, Preeyaporn Chaiyasat
Summary: In this study, emulsifier-free emulsion iodine transfer polymerization of styrene was carried out using unpurified and purified PMAA-I, synthesized previously by solution ITP in dioxane. It was found that purified PMAA-I resulted in smaller polymer particles with higher conversion compared to unpurified PMAA-I. The remaining CHI3 in the unpurified system acted as a chain transfer agent, while high molecular weight PS homopolymers were formed in the purified system through emulsion conventional radical polymerization. Additionally, post-adding CHI3 after 90 minutes successfully depressed emulsion conventional radical polymerization, resulting in nearly uniform submicrometer-sized PS particles with narrow molecular weight distribution.
POLYMER INTERNATIONAL
(2022)
Article
Chemistry, Physical
Haruyuki Ishii, Hitoshi Nakazawa, Naoto Kuwasaki, Daisuke Nagao, Mikio Konno
Summary: Selections of surfactants and their concentrations are critical factors in emulsion polymerization. This study compares the effects of sodium octadecyl sulfate (SOS) and sodium dodecyl sulfate (SDS) on the formation of polymer nanoparticles, and examines the number and polydispersity of the nanoparticles.
COLLOID AND POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Kanako Watanabe, Yui Tajima, Takuya Shimura, Haruyuki Ishii, Daisuke Nagao
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2019)
Article
Chemistry, Multidisciplinary
Michinari Kohri, Yuki Tamai, Ayaka Kawamura, Keita Jido, Mikiya Yamamoto, Tatsuo Taniguchi, Keiki Kishikawa, Syuji Fujii, Naozumi Teramoto, Haruyuki Ishii, Daisuke Nagao
Article
Engineering, Chemical
Ayumi Yahata, Haruyuki Ishii, Kosuke Nakamura, Kanako Watanabe, Daisuke Nagao
ADVANCED POWDER TECHNOLOGY
(2019)
Article
Chemistry, Physical
Kanako Watanabe, Tom A. J. Welling, Sina Sadighikia, Haruyuki Ishii, Arnout Imhof, Marijn A. van Huis, Alfons van Blaaderen, Daisuke Nagao
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Chemistry, Physical
Tom A. J. Welling, Sina Sadighikia, Kanako Watanabe, Albert Grau-Carbonell, Maarten Bransen, Daisuke Nagao, Alfons van Blaaderen, Marijn A. van Huis
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2020)
Article
Chemistry, Physical
Hikaru Namigata, Kanako Watanabe, Saya Okubo, Daisuke Nagao
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Chemistry, Physical
Kota Fujimoto, Kanako Watanabe, Shunho Ishikawa, Haruyuki Ishii, Keishi Suga, Daisuke Nagao
Summary: This study synthesized 100 nm-sized spherical mesoporous silica particles in the presence of hydrophobic agents and investigated their pore size distributions. The results showed that the coexistence of different hydrophobic agents with CTAB micelles resulted in variations in the pore size distribution of MSPs, with Ra value serving as an indicator for pore expansion.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Hikaru Namigata, Kanako Watanabe, Saya Okubo, Masashi Hasegawa, Keishi Suga, Daisuke Nagao
Summary: The study explores the immobilization of photocatalytic particles in a continuous flowing system using double inverse-opal (DIO) structures. Increasing macropore size enhances the decomposition rate of organic dye due to high diffusion rate, but excessive increase can lower the rate due to light attenuation. These novel immobilized photocatalytic DIO-structured particles can be used by tuning particle size, macropore size, and DIO thickness.
Article
Chemistry, Multidisciplinary
Kanako Watanabe, Takuya Shimura, Akira Nagasawa, Daisuke Nagao
Summary: The multipoint lock-and-key particle assembly methodology creates rigid colloidal molecules mimicking rigid polymers by connecting lock particles with anisotropic dents to rod-shaped key particles in the presence of depletants. This assembly technique lowers particle diffusion significantly, suggesting its potential as a promising colloidal model for studying atomic-scale polymers associated with micro Brownian motion.
Article
Chemistry, Multidisciplinary
Kota Fujimoto, Shunho Ishikawa, Kanako Watanabe, Haruyuki Ishii, Keishi Suga, Daisuke Nagao
Summary: The study investigated the mechanism of forming mesoporous silica shells on nonporous spherical silica cores, and found that using sodium bromide as an electrolyte can suppress the generation of secondary particles to form a uniform mesoporous shell. The results suggest that controlling the ionic strength of the silica coating is an effective approach to suppress the generation of secondary particles, which is important for designing mesoporous shells suitable for high-performance liquid chromatography column packing materials.
Article
Nanoscience & Nanotechnology
Ryota Kameda, Taisei Suzuki, Ikumi Kato, Keishi Suga, Kanako Watanabe, Kimiko Nagino, Kumiko Hayashi, Satoshi Arai, Daisuke Nagao
Summary: In recent years, many photothermal materials have been developed for efficient photothermal therapy. However, upsizing these materials for better performance hampers cellular uptake. To overcome this, an active control system was proposed to manipulate the assembly of magnetic composite particles (MCPs) at the cellular level. Different-sized MCPs were synthesized and their surfaces were modified, showing improved dispersibility and cellular uptake. The assembly and redispersal of MCPs were controlled using a direct current magnetic field (DCMF), leading to improved cytotoxicity under near-infrared laser irradiation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Keishi Suga, Makina Murakami, Shota Nakayama, Kanako Watanabe, Sayuri Yamada, Toshikazu Tsuji, Daisuke Nagao
Summary: Polymer nanoparticles, specifically cationic polystyrene (PSt) nanoparticles synthesized via soap-free emulsion polymerization, were investigated for their surface properties and antibacterial activity. It was found that PSt nanoparticles with larger affinity values (K) exhibited antibacterial activity against Staphylococcus epidermidis. These nanoparticles disrupted the bilayer structure of model membranes, indicating their potential as contact-killing antibacterial agents.
ACS APPLIED BIO MATERIALS
(2022)
Article
Materials Science, Composites
Masaki Sato, Haruyuki Ishii, Yoshiki Sueda, Kanako Watanabe, Daisuke Nagao
Summary: Reinforcement of dielectric nanocomposite for polyvinyl fluoride (PVDF) matrix using TEMPO-oxidized cellulose nanofiber and barium titanate nanoparticles led to improvement in mechanical strength and dielectric properties through chemical treatment and surface modification.
COMPOSITES PART C: OPEN ACCESS
(2021)
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.
