Article
Materials Science, Multidisciplinary
Zewei Zhu, Yingbo Liu, Junqi Ge, Zhaoyu Hu, Gaorong Zeng, Xuehui Peng, Wenhui Xu, Xinwen Peng
Summary: In this study, a conductive filler strategy involving in-Situ formation was utilized to prepare polymer-matrix composites with significantly enhanced dielectric permittivity and well-retained mechanical flexibility. The resulting composites showed high permittivity due to the synergistic contribution between the in-Situ formed PCS and rGO conductive networks. The prepared material exhibited promising properties for flexible electronics applications, with slightly decreased mechanical and thermal properties.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Namrata Maslekar, Yasemin Fadil, Per B. Zetterlund, Vipul Agarwal
Summary: In this study, in situ reduction strategies were developed to chemically reduce graphene oxide (GO) while maintaining the colloidal stability of an aqueous polymer/GO dispersion. The reduced dispersions exhibited colloidal stability for over 6 months and could be drop cast to form nanocomposite films. The highest electrical conductivity was achieved by reducing with hydrazine hydrate, followed by hydroiodic acid, while sodium borohydride and ascorbic acid reduction resulted in significantly lower electrical conductivities.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Valentin A. Bobrin, Sung-Po Chen, Carlos Fitzgerald Grandes Reyes, Bing Sun, Chun Ki Ng, Youry Kim, Damian Purcell, Zhongfan Jia, Wenyi Gu, Jason W. Armstrong, Julie McAuley, Michael J. Monteiro
Summary: The water-borne spray-on coating is reported to completely inactivate viral particles and degrade their RNA, targeting a wide range of viruses including SARS-CoV-2 and its variants, influenza A, and others. The nanoworm technology presents a powerful control measure for viral inactivation and is environmentally friendly, with the potential for broad application in future pandemics.
Article
Nanoscience & Nanotechnology
Bich Ngoc Tran, Saroj Bhattacharyya, Yin Yao, Vipul Agarwal, Per B. Zetterlund
Summary: Surfactants play a crucial role in the design and synthesis of nanocomposites, impacting the properties of the final materials. This study investigates the influence of different surfactant methods on the synthesis and properties of electrically conductive polymer/rGO nanocomposites. Results show that nanocomposite films prepared using conventional surfactant approach exhibit significantly higher electrical conductivity.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hui Ning, Xiang Fei, Zhonghao Tan, Wenhang Wang, Zhongxue Yang, Mingbo Wu
Summary: The use of renewable electricity as a catalyst for carbon dioxide reduction shows promise for CO2 utilization, but the lack of efficient catalysts limits its industrial applications. In this study, ultrathin indium sulfide nanosheets were synthesized and combined with reduced graphene oxide to create a composite material with improved catalytic properties for CO2 electroreduction.
ACS APPLIED NANO MATERIALS
(2022)
Review
Polymer Science
Yubin Wang, Baojiang Sun, Zhiwei Hao, Jianhua Zhang
Summary: Hybrid latex particles, which combine inorganic nano/micro particles with polymers, have shown great potential for various applications. In recent years, there has been increased interest in designing and preparing hybrid latex particles with well-defined size, structure, and morphology. In situ (Pickering) emulsion polymerization has been proven to be a powerful method for large-scale preparation of hybrid latex particles due to its simplicity, versatility, and environmental friendliness. This review systematically summarizes the strategies and applications of in situ (Pickering) emulsion polymerization for the preparation of hybrid latex particles, with a focus on enhancing properties and achieving well-defined morphologies such as core-shell, yolk-shell, multinuclear, raspberry-like, dumbbell-shaped, multipod-like, or armored structures. The presented advances, examples, and principles in this review aim to inspire further research on current preparation technologies, development of new processes, and exploration of hybrid latex particles with outstanding characteristics and properties.
Article
Chemistry, Physical
Suguna Perumal, Raji Atchudan, In Woo Cheong
Summary: The study showed that the graphene-iron oxide composite exhibited significantly improved catalytic activity for the hydrogen evolution reaction in an acidic electrolyte, due to the synergistic effect between magnetic IONPs and PMPC polymer, along with the increased electron transfer rate from the conductive graphene. The G-INSCP catalyst demonstrated lower overpotential and Tafel slope compared to other catalysts, making it a potential candidate for HER and paving the way for the development of new catalysts for various applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Weiwei Xiao, Na Ni, Xiaohui Fan, Xiaofeng Zhao, Yingzheng Liu, Ping Xiao
Summary: This study reported an ambient flash sintering behavior of reduced graphene oxide/3 mol% yttria-stabilized ZrO2 composites, achieving dense and conductive composites at room temperature within a short time. The use of reduced graphene oxide as both a composite component and a conductive additive eliminates the need for vacuum and furnace, promising simplified fabrication equipment for energy and cost savings.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Xinghua Su, Zhihua Jiao, Gai An, Mengying Fu, Qiang Tian, Xing Sun
Summary: This study found that the current density limit and furnace temperature are important control factors for flash sintering of Al2O3/rGO composites. Higher current density results in higher density, but excessive current density can lead to sample breakage. Under specific conditions, such as a furnace temperature of 800 degrees C, an electric field of 300 V cm(-1), and a current density limit of 33.33 A cm(-2), nearly completely dense Al2O3/rGO composites can be achieved.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Chemical
Chongbin Wang, Yongsheng Li, Hongchao Wang, Yiyu Wang, Xiaoyu Chen, Chengze Li, Mengfei Sun, Jianxin Chen
Summary: This study introduces microporous polymer networks (MPNs) and graphene oxide (GO) sheets to significantly improve the water flux of nanofiltration membranes. By adjusting the content of MPNs nanoparticles, a delicate wrinkled membrane surface is formed, providing a larger area in contact with water molecules. The prepared membrane also exhibits high salt retention and good anti-fouling property.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ruoqi Chen, Huanrong Zhang, Xinlei Ma, Yuqiao Chai, Haibo Bi, Hui Ma, Nan Zhu, Junhui Ji, Mianqi Xue
Summary: This study investigates the challenge of regulating the internal environment of metal products while ensuring anti-corrosion performance. A reduced graphene oxide/polypyrrole-polydimethylsiloxane oligomer (rGOPPO) coating is prepared using in-situ epitaxial polymerization and interlayer in-situ crosslinking. The coating exhibits a ultrahigh anti-corrosion efficiency of 99.9% in neutral and oxidizing environments, and demonstrates excellent regulation ability for the internal environment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Wenqing Xu, Yadong Lv, Miqiu Kong, Yajiang Huang, Qi Yang, Guangxian Li
Summary: This study demonstrates the potential of polydopamine-modified graphene oxide (DGO) in fabricating strong and durable waterborne polyurethane (WPU) materials through in-situ polymerization. The addition of a small amount of DGO significantly enhances the mechanical properties of WPU and reduces its oxidation degree, making it a promising eco-sustainable option for high-quality WPU production.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Nanoscience & Nanotechnology
Maricruz G. Saborio, Karen Privat, Bich Ngoc Tran, Per B. Zetterlund, Vipul Agarwal, Francesc Estrany
Summary: In this work, an asymmetric pseudocapacitor with P(nBA-stat-BzMA)/reduced graphene oxide (rGO) nanocomposite electrodes incorporating lignosulfonate (LS) was synthesized and characterized. The LS not only acts as a binder but also contributes to the improvement of electrochemical performance. The optimized assembly of unit cells showed high capacitance, power, and energy, with minimal loss of electroactivity after 1000 charge-discharge cycles.
ACS APPLIED NANO MATERIALS
(2022)
Article
Polymer Science
Yalin Li, Jieling Luo, Baoquan Huang, Hongjun Jin, Xiaoli Sun, Changlin Cao, Qinghua Chen, Qingrong Qian
Summary: This study successfully addressed the poor interface compatibility between graphene and polymer resin and improved the water and oxygen resistance of water-based styrene-acrylic emulsion through the introduction of graphene. The graphene-modified coating for building showed good performance in line with industry standards and exhibited a benign electromagnetic interference (EMI) shielding effect even with low graphene content.
Article
Materials Science, Ceramics
Cristina Lopez-Pernia, Ana Morales-Rodriguez, Angela Gallardo-Lopez, Rosalia Poyato
Summary: Graphene oxide was mixed with 3 mol% yttria tetragonal zirconia polycrystal using two different powder processing methods to create composites with varying levels of reduced graphene oxide. In-situ reduction of GO was successfully achieved during high temperature sintering, and detailed analysis of the graphene structure in the sintered composites was performed using Raman spectroscopy. Composites prepared by planetary ball milling showed more uniform distribution of rGO and higher electrical conductivity compared to those prepared by other methods.
CERAMICS INTERNATIONAL
(2021)
Article
Polymer Science
Cuong Minh Quoc Le, Gautier Schrodj, Ibrahima Ndao, Brahim Bessif, Barbara Heck, Thomas Pfohl, Guenter Reiter, Justine Elgoyhen, Radmila Tomovska, Abraham Chemtob
Summary: The photocatalytic thiol-ene aqueous emulsion polymerization under visible-light is a novel method to prepare linear semicrystalline latexes with specific properties. The reaction conditions are mild, the reaction time is short, and the resulting products exhibit a unique structure and characteristics.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Sevilay Bilgin, Sobhan Bahraeian, Mei Ling Liew, Radmila Tomovska, Jose M. Asua
Summary: The use of surfactant-free latex with sodium styrene sulfonate as a binder in coatings shows improved performance compared to commercial binders stabilized with surfactants. This research suggests that surfactant-free latex may be a viable alternative for coating applications.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Chemistry, Multidisciplinary
James D. Tinkler, Alberto Scacchi, Maialen Argaiz, Radmila Tomovska, Andrew J. Archer, Helen Willcock, Ignacio Martin-Fabiani
Summary: This study investigates the effects of particle interactions on the size segregation and assembly of colloidal mixtures during drying. By adding a cationic surfactant to a binary latex/silica colloidal dispersion, the researchers observed a reduction in stratification and even suppression of the effect. Higher surfactant concentrations resulted in the formation of armored particles consisting of latex particles coated with smaller silica nanoparticles.
Article
Chemistry, Applied
Iranzu Barbarin, Nikolaos Politakos, Luis Serrano-Cantador, Juan Antonio Cecilia, Oihane Sanz, Radmila Tomovska
Summary: This study presents a versatile and robust technique for the production of functionalized 3D porous graphene/polymer monolithic structures based on aqueous self-assembly process. The addition of polymer particles in the synthesis allows for the control of textural properties and improved selectivity for CO2 capture.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Maialen Argaiz, Miren Aguirre, Radmila Tomovska
Summary: Emulsifier-free cationic polymer colloids produced by emulsion polymerization have been successfully controlled and stabilized by using a minor quantity of cationic monomer containing two charges, resulting in stable dispersions with high solids content and films with tunable properties.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Polymer Science
Hansel Mathieu Coureur, Tatiana Petithory, Aissam Airoudj, Ludovic Josien, Ana Trajcheva, Radmila Tomovska, Abraham Chemtob
Summary: In this study, the methods to quantify particle concentration profiles within the film thickness of bimodal latex film's formation were investigated. The advantages and limitations of confocal fluorescence microscopy (CFM) and scanning electron microscopy (SEM) were compared. The results showed that at low volume fractions of small particles, the large particles formed a surface stratification, while the small particles formed a stratified surface layer above the large particles, which was only detected by SEM.
Article
Polymer Science
Maialen Argaiz, Miren Aguirre, Radmila Tomovska
Summary: This study proposes an ionic complexation strategy between oppositely charged waterborne polymer particles to improve the performance of waterborne polymer coatings. By using double charged ionic monomers to functionalize polymer particles and delaying complexation through the addition of non-ionic polymeric stabilizing species, ionic complexed films with enhanced mechanical properties and water sensitivity were obtained.
Article
Chemistry, Applied
Sumi Murali, Amaia Agirre, Radmila Tomovska
Summary: This study investigates the use of zwitterionic monomers to enhance the colloidal stability of high solids content waterborne dispersions, achieving excellent results.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Materials Science, Multidisciplinary
Iranzu Barbarin, Nikolaos Politakos, Luis Serrano Cantador, Juan Antonio Cecilia, Oihane Sanz, Radmila Tomosvka
Summary: This study demonstrates the importance of controlling the textural properties of composite materials and the use of highly crosslinked polymer particles in improving CO2 capture performance.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Andre T. S. Ribeiro, italo R. S. Araujo, Emerson F. M. da Silva, Pedro N. Romano, Joao M. A. R. Almeida, Eduardo F. Sousa-Aguiar, Radmila Tomovska, Oihane Sanz, Luciano C. Almeida
Summary: The effect of two catalyst preparation methods (incipient wetness impregnation and all-in-one methods) of ceria-alumina-supported Ni-based catalysts on dry reforming of methane reaction was investigated. The all-in-one method provided greater metal dispersion, higher reduced fraction, and increased presence of weak basic sites, resulting in lower carbon deposition and higher conversions compared to the incipient wetness impregnation method. However, the incipient wetness impregnation method showed higher turnover frequency due to weaker metal-support interaction. Overall, the all-in-one method is a promising catalyst preparation technique for dry reforming of methane.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Polymer Science
Brahim Bessif, Barbara Heck, Thomas Pfohl, Cuong Minh Quoc Le, Abraham Chemtob, Valentina Pirela, Justine Elgoyhen, Radmila Tomovska, Alejandro J. Mueller, Guenter Reiter
Summary: We investigated the crystallization and melting behavior of an alternating copolymer synthesized by photopolymerization. Two melting processes were observed upon increasing temperature, which were related to the formation and disappearance of two crystalline polymorphs. Crystals grew in a radial direction within molten spherulites, suggesting a memory effect of polymer chains. This memory assisted nucleation and enabled the formation of a high-Tm polymorph.
Article
Materials Science, Multidisciplinary
Valentina Pirela, Justine Elgoyhen, Radmila Tomovska, Jaime Martin, Cuong Minh Quoc Le, Abraham Chemtob, Brahim Bessif, Barbara Heck, Guenter Reiter, Alejandro J. Mueller
Summary: A complex crystallization behavior was observed for the alternating copolymer DMDS-alt-DVE synthesized via thiol-ene step-growth polymerization. Understanding the underlying complex crystallization processes of such innovative polythioethers is critical for their application, for example, in polymer coating technologies. The study of polymorphism, crystallization, and morphological differences can have significant implications on mechanical resistance and barrier properties of these polymers.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Timothy J. Murdoch, Baptiste Quienne, Maialen Argaiz, Radmila Tomovska, Edgar Espinosa, Franck D'Agosto, Muriel Lansalot, Julien Pinaud, Sylvain Caillol, Ignacio Martin-Fabiani
Summary: Self-stratification of model blends of colloidal spheres has been achieved through the addition of rheology modifiers, such as xanthan gum, Carbopol 940, and HEUR10kC12, which affect the viscosity and particle interactions. Xanthan gum allows for small-on-top stratification, while Carbopol 940 leads to lateral segregation or surface enrichment of large particles depending on pH. HEUR10kC12 results in small-on-top, large-enhanced, and randomly mixed structures. Understanding these mechanisms is crucial for predicting and controlling stratification in coating formulations.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Justine Elgoyhen, Valentina Pirela, Alejandro J. Muller, Radmila Tomovska
Summary: Waterborne thiol-ene polymer dispersions with high solid content and film-forming ability have been successfully synthesized using initiator-free step growth copolymerization. The addition of a water-soluble photoinitiator further increased the polymer's molar mass. A self-nucleation procedure was implemented to accelerate the crystallization kinetics of the poly(thioether) chains.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Multidisciplinary Sciences
Branislav Stankovic, Iranzu Barbarin, Oihane Sanz, Radmila Tomovska, Fernando Ruiperez
Summary: This study investigates the combination of graphene oxide (GO) and functionalized waterborne polymer particles as versatile and promising candidates for CO2 capture. Through density functional theory (DFT) calculations, the interactions of these composite materials with CO2 and N-2 molecules are explored to select the most efficient functional monomers. The results show that the selection of polymer functionalities significantly affects the CO2 capture performance. This research also highlights the potential of DFT calculations for efficiently selecting the best functionalization of composite materials for selective CO2 capture.
SCIENTIFIC REPORTS
(2022)
