Article
Chemistry, Multidisciplinary
Magnus Mahl, M. A. Niyas, Kazutaka Shoyama, Frank Wuerthner
Summary: This study demonstrates the assembly of C-64 nanographene derivative with smaller PAHs into multilayer stacks and identifies dispersion forces as the main stabilizing factor for these complexes.
Article
Chemistry, Physical
Leekang Jeon, Yurim Kim, Jongsun Yoon, Hanjin Seo, Hyomin Lee
Summary: A one-step microfluidic approach was used to prepare pH-responsive microcapsules through interfacial complexation of hydrogen bonding polymers. Polymeric microcapsules with an aqueous core and a shell of complementary hydrogen bonding polymers were prepared using triple-emulsion droplets as templates. The resulting PPO/PMAA microcapsules showed stability at high salt concentrations and released the encapsulated protein above the critical pH.
Review
Polymer Science
Emmanouil Vereroudakis, Dimitris Vlassopoulos
Summary: Supramolecular polymers are important in both scientific and technological aspects due to their dynamic nature and responsiveness to environmental parameters, showing diverse self-assembly structures and potential applications. However, there are still significant challenges in understanding the basic knowledge and unresolved issues, requiring further systematic categorization and analysis of experimental evidence.
PROGRESS IN POLYMER SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sergi Bujosa, Azahara Doncel-Gimenez, Nils Baeumer, Gustavo Fernandez, Enrique Orti, Antonio Costa, Carmen Rotger, Juan Arago, Bartolome Soberats
Summary: Hydrogen-bonded squaramide (SQ) supramolecular polymers exhibit uncommon thermoreversible polymorph transitions between particle- and fiber-like nanostructures. The transitions are triggered by the molecular reorganization of the SQ units changing from slipped to head-to-tail hydrogen bonding patterns. These transitions have concentration-dependent and kinetic characteristics, and are of interest in developing stimuli-responsive systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Aliaksei Aliakseyeu, Elena E. Dormidontova, Svetlana A. Sukhishvili
Summary: The study examines the impact of molecular architecture, star-shaped vs. linear, of poly(ethylene oxide) (PEO) on the formation of hydrogen-bonded complexes with linear poly(methacrylic acid) (PMAA). It finds that star-shaped PEO has a higher localized hydrogen bond density compared to linear PEO, leading to changes in the formation process of complexes.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Polymer Science
Yanjing Zhang, Xingyu Cao, Yuyu Zhao, Huahuo Li, Shengwei Xiao, Zhangxin Chen, Guobo Huang, Ye Sun, Zhenzhong Liu, Zhicai He
Summary: As one of the most important anisotropic intelligent materials, bi-layer stimuli-responsive actuating hydrogels have wide potential in various fields. However, their single-actuating process under one external stimulus limits their further application. In this study, a new anisotropic hydrogel actuator was developed by local ionic crosslinking, enabling sequential two-stage bending under a single stimulus. This bi-layer hydrogel system allows for controlled bending behavior and complex shape transformations, inspiring the design of programmable hydrogel-based actuators.
Article
Engineering, Chemical
Marica Muscetta, Roberto Andreozzi, Laura Clarizia, Raffaele Marotta, Giovanni Palmisano, Grazia Policastro, Marco Race, Ahmed Yusuf, Ilaria Di Somma
Summary: The study focuses on the extraction of nickel from secondary resources using a chloride-based solution containing cupric ions. Optimal operating conditions were identified, resulting in the complete dissolution of metallic nickel from waste materials. The proposed method also shows potential for selective metal recovery through precipitation and photodeposition on titanium dioxide.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Llorenc Rubert, Md Faizul Islam, Andrew B. Greytak, Rahul Prakash, Mark D. Smith, Rosa Maria Gomila, Antonio Frontera, Linda S. Shimizu, Bartolome Soberats
Summary: We reported the self-assembly of a dendronized bis-urea macrocycle into two-dimensional nanosheets via a cooperative mechanism. The self-assembly mode of the macrocycle changed drastically in different solvents, and the formation of two-dimensional networks was promoted by solvent effects and a sophisticated hydrogen-bonding pattern.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Gwenael Atcheson, Katarzyna Siewierska, J. M. D. Coey, Karsten Rode, Plamen Stamenov
Summary: Examined the effects of different spacer layers on the interfaces between ferrimagnetic and ferromagnetic materials. The loss of perpendicular anisotropy in the ferrimagnetic material is related to the relaxation of the crystal structure. The limited solubility of certain elements provides additional valence electrons, stabilizing the perpendicular anisotropy and compensating for changes in strain and defect density. The Mo spacer layer promotes the formation of a phase that retains its perpendicular anisotropy.
Article
Chemistry, Analytical
Chenxi Hou, Hui He, Jinjie Sun, Bei Yang, Haofan Fang, Caishan Jiao, Mingjian He
Summary: The dissolution behavior of UO2 powder in carbonate-peroxide solution is influenced by different dissolution parameters. Increasing H2O2 concentration enhances UO2 dissolution, while increasing carbonate concentration has no significant influence. (NH4)2CO3 performs better than Na2CO3 at the same initial pH. Moreover, UO2 dissolution is significantly affected by pH value.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Hongyuan Yang, Peifang Guo, Ruirui Wang, Ziliang Chen, Hongbin Xu, Hongge Pan, Dalin Sun, Fang Fang, Renbing Wu
Summary: This study develops a hierarchical structure composed of Ni2P-Ni12P5 nanorod arrays and Ni3S2 film through a unique sequential phase conversion strategy. The structure exhibits excellent catalytic performance and stability for the hydrogen evolution reaction. The findings may provide new insights for the rational design of non-precious electrocatalysts for pH-universal hydrogen production.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Andre Nicolai Petelski, Celia Fonseca Guerra
Summary: Hydrogen-bonded supramolecular systems can obtain extra stabilization through complexation with ions. The presence of ions weakens the hydrogen bonds but strengthens the cooperativity by pulling the monomers closer together. This results in larger steric repulsion but enhanced donor-acceptor interactions, leading to more charge donation and enhanced electrostatic attraction.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Polymer Science
Maksim Dolmat, Veronika Kozlovskaya, Daniel Inman, Claire Thomas, Eugenia Kharlampieva
Summary: This study developed a dynamic assembly of hydrogen-bonded multilayers and compared them to static multilayers. The dynamic multilayers showed a 15-time faster deposition rate and a 30% increase in thickness and roughness compared to static multilayers. The properties of the coatings, including mechanical properties, wettability, hydration, and pH stability, were insignificantly affected by the assembly mode.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Ronny Kuersteiner, Maximilian Ritter, Yong Ding, Guido Panzarasa
Summary: In this study, we conducted a preliminary investigation on the dissolution dynamics of zinc oxide nanoparticles in the presence of cyclic esters as slow acid generators. The particles' dissolution was monitored using turbidimetry and correlated with the changes in pH over time. These results could be significant for the design of chemically programmable colloidal systems.
Article
Chemistry, Multidisciplinary
Petra Stanic, Dario Barisic, Damir Pajic, Ana Santic, Kresimir Molcanov
Summary: This study investigates a series of six novel salts formed by aromatic cations and 5,6-dichloro-2,3-dicyanosemiquinone (DDQ) radical anions through structural characterization, magnetization, and conductivity measurements. Different stacking modes of DDQ radicals and the general features of pancake bonding are observed.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Jin-Ok Chu, Yoon Choi, Do-Wan Kim, Hye-Seon Jeong, Jong Pil Park, David A. Weitz, Sei-Jung Lee, Hyomin Lee, Chang-Hyung Choi
Summary: This study reports the development of cell-inspired hydrogel microcapsules that effectively encapsulate and retain antioxidants. The microcapsules have an interstitial oil layer and an ionic gelation hydrogel shell, providing enhanced retention and protection of the antioxidants. Addition of a lipophilic reducing agent in the oil layer enhances the antioxidant activity, and lowering the storage temperature further improves the antioxidant activity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Minji Kim, Kyounghee Jeon, Won Hee Kim, Jeong Wook Lee, Yoon-Ho Hwang, Hyomin Lee
Summary: The use of Janus nanoparticles as colloidal surfactants can achieve excellent stability in W/F emulsions and prevent non-specific adsorption of proteins.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Hyeongjeong Kim, Sukyoung Lee, Ye Rim Shin, Yun-Nam Choi, Jongsun Yoon, Min Ryu, Jeong Wook Lee, Hyomin Lee
Summary: A durable superhydrophobic PVDF-based nanofibrous membrane was developed for high-performance air filters with reusability. The membrane exhibited nonwetting properties and resistance to various liquids, easy removal of dust particles, and suppression of bacterial adhesion. Additionally, the modified membrane remained structurally unchanged after ethanol sterilization. Applying these modified membranes on top of unmodified analogues resulted in air filters with high filtration performance, mechanical strength, and reusability.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Environmental
Yoon-Ho Hwang, Taewoong Um, Gwang-Noh Ahn, Dong-Pyo Kim, Hyomin Lee
Summary: Emulsions are ideal templates for preparing functional microparticles, but mass production of oil-in-water emulsions has been a practical hurdle. In this study, a novel 3D-printed milli-fluidic device (3D-PMD) was developed for robust and scalable production of water-in-oil and oil-in-water emulsions. The device integrated 40 drop-makers, a 3D void geometry, and a flow distributor using additive manufacturing. Experimental results and simulations confirmed the design's validity and the device's capability to produce controllable microgels and microparticles. The simple and low-cost 3D-PMD method offers a unique route for producing emulsions in a robust and scalable manner, with a wide range of applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Caitlin S. Sample, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: In this study, a new hydroxyl-containing chain transfer agent (CTA) was developed, which allowed for the direct synthesis of hydroxy-telechelic polyalkenamers and subsequent hydrogenation using a streamlined catalytic approach. This method offers high atom economy, low waste generation, uses a green solvent, requires minimal catalyst quantity, and does not require additional purification steps.
Article
Multidisciplinary Sciences
Hanjin Seo, Hyomin Lee
Summary: In this study, a microfluidic approach was used to prepare semi-permeable polymersomes and achieve external signal-driven complex coacervation and biophysical reconstitution. The synthesis of polymersomes through microfluidics enables precise control over size, efficient encapsulation of enzymes, and regulation of substrates. The resulting polymersomes showed size-selectivity and allowed for enzymatic reactions and coacervation or actin polymerization.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Min Ryu, Hyoungwoo Choi, Jongsun Yoon, Yun-Nam Choi, Sukyoung Lee, Hyeongjeong Kim, Minji Chae, Jeong Wook Lee, Jinkyu Kang, Hyomin Lee
Summary: This study presents a new strategy to improve the durability and acid resistance of copper substrates by infusing fluorocarbon oil and silica nanoparticles (SiNP). The assembly of SiNP layer provides additional anchoring points for lubricant retention, and the resulting liquid-infused surface (LIS) exhibits excellent non-wetting and self-cleaning properties, leading to enhanced stability against acid exposure and contamination.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jaeyeong Kwon, Hyomin Lee
Summary: In this study, Polyethylene Glycol (PEG) microgels embedded with magnetic nanoparticles (MNP) were used as fining agents for the effective adsorption and removal of tannins. The high surface area of PEG microgels allowed efficient adsorption of tannins through hydrogen-bonding, and the incorporated MNP facilitated easy recovery of the adsorbed tannic acid (TA) via magnetic decantation. The study also demonstrated that the adsorbed TA could be converted into ellagic acid (EA) through simple base treatment of the TA-adsorbed microgels.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Polymer Science
Aristotle J. Zervoudakis, Caitlin S. Sample, Xiayu Peng, Davis Lake, Marc A. Hillmyer, Christopher J. Ellison
Summary: Polymer blend compatibilization using hydroxy-telechelic polyethylene (HOPEOH) reactive additives resulted in reduced dispersed phase particle sizes and increased ductility. The hydroxy ends of HOPEOH undergo transesterification reactions during melt mixing with PET to form PET-PE-PET triblock copolymers at the interface, enhancing compatibility by entangling the PE midblocks with LLDPE chains.
Review
Engineering, Biomedical
Hanjin Seo, Leekang Jeon, Jaeyeong Kwon, Hyomin Lee
Summary: The recent advance in RNA-based therapeutics using lipid nanoparticles (LNP) for efficient delivery of nucleic acids has led to effective treatment of various diseases. This review summarizes the progress made in LNP research, including the constituent components, formulations, and diverse applications. The use of microfluidic methodologies for precise assembly of LNP with controllable composition and size, high encapsulation efficiency, and scalable production is highlighted. Current challenges and emerging approaches to overcome these challenges are also discussed.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hye-Seon Jeong, Eunseo Kim, Jong Pil Park, Sei-Jung Lee, Hyomin Lee, Chang Hyung Choi
Summary: We developed PNIPAm-co-PEGDA hydrogel shelled microcapsules with a thin oil layer for tunable thermo-responsive release of small hydrophilic actives. By using a microfluidic device integrated with a temperature-controlled chamber, we were able to consistently produce the microcapsules using triple emulsion drops as capsule templates. The presence of an interstitial oil layer between the aqueous core and the hydrogel shell allowed for controlled release of the encapsulated substances upon reaching a critical temperature. Additionally, the incorporation of gold nanorods in the hydrogel shell enables spatiotemporal regulation of the active release using near infrared light.
JOURNAL OF CONTROLLED RELEASE
(2023)
Article
Chemistry, Physical
Leekang Jeon, Yurim Kim, Jongsun Yoon, Hanjin Seo, Hyomin Lee
Summary: A one-step microfluidic approach was used to prepare pH-responsive microcapsules through interfacial complexation of hydrogen bonding polymers. Polymeric microcapsules with an aqueous core and a shell of complementary hydrogen bonding polymers were prepared using triple-emulsion droplets as templates. The resulting PPO/PMAA microcapsules showed stability at high salt concentrations and released the encapsulated protein above the critical pH.
Article
Materials Science, Multidisciplinary
Jin Ryu, Myung Seok Oh, Jongsun Yoon, Minjeong Kang, Jae Bem You, Hyomin Lee, Sung Gap Im
Summary: Recent advances in wearable and embeddable displays have increased the demand for functional coatings that are stretchable and maintain high optical transparency in fogging conditions. A conformal antifogging polymer thin film with exceptional stretchability was synthesized using initiated chemical vapor deposition (iCVD). This film offers excellent antifogging performance and high elasticity, and outperforms commercial antifogging spray coatings in transmittance, even in hot water vapor, cold-fog transition tests, and when stretched.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Biomaterials
Je Hyun Lee, Yoon-Ho Hwang, Minjoo Noh, Ji Hyun Lee, Jun Bae Lee, Hyomin Lee
Summary: Alcohol solvents are encapsulated in palm oil-based microcapsules for the effective transdermal delivery of high-content actives. Clinical trials reveal that the presence of dipropylene glycol (DPG) effectively mediates the transdermal delivery of these actives without causing any skin irritation. This study offers new possibilities in cosmetics, food, and drug delivery systems.
BIOMATERIALS SCIENCE
(2023)
Article
Polymer Science
Aristotle J. Zervoudakis, Caitlin S. Sample, Xiayu Peng, Davis Lake, Marc A. Hillmyer, Christopher J. Ellison
Summary: Polymer blend compatibilization using hydroxy-telechelic polyethylene (HOPEOH) reactive additives was achieved in this study for PET and LLDPE blends. The HOPEOH additives underwent transesterification reactions with PET during melt mixing, forming triblock copolymers and improving blend toughness. The results demonstrated that HOPEOH compounds were effective in compatibilizing blends derived from postconsumer PET and PE.
