Article
Polymer Science
Amrish Kumar Padmakumar, Nikhil K. Singha, Muthupandian Ashokkumar, Frank A. Leibfarth, Greg G. Qiao
Summary: Advances in nanomolecular engineering have led to the development of technology using ultrasonic irradiation to initiate polymerization. In this study, ultrasound-assisted reversible addition chain-transfer (Sono-RAFT) polymerization was used to compare batch and continuous flow polymerization methods on monomer conversion, polymer molar mass, and dispersity using different monomer substrates. Results showed that continuous flow polymerization had higher monomer conversion compared to batch reactions under the same conditions. Continuous flow reactors with stainless-steel microreactors provided higher cavitation intensity and lower oxygen contamination, making Sono-RAFT possible at higher monomer concentrations. These findings have implications for mechanochemistry and the practical and sustainable implementation of sonochemically regulated polymerization.
Article
Engineering, Environmental
Vinai K. Singh, Krishna Kumar, Shailja Rai, Aradhana Chaudhary, Kranthikumar Tungala, Anupam Das
Summary: This report focuses on the use of polymeric microgel of chitosan flakes (CF) for catalytic applications of bimetallic Ag/CuO nanoparticles (NPs). The nanocomposites, based on fabricated chitosan flakes, act as nanocatalysts and are able to efficiently reduce methylene blue (MB), para-nitro phenol (PNP), and dimethyl amino-benzaldehyde (DMAB) using sodium borohydride or UV light. By utilizing N-hydroxyl methyl acrylamide as both monomer and cross linker, the chitosan flakes are successfully synthesized and doped with Ag/CuO NPs to form stabilized nano-composites.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Sung-Po R. Chen, Valentin A. Bobrin, Zhongfan Jia, Michael J. Monteiro
Summary: In this study, we demonstrate a simple and effective solvent-free method to prepare anisotropic polymer nanoparticles directly in water by controlling polymer mobility through tuning its glass transition temperature (T-g). The morphology of the particles can be transformed from spherical to tadpole-like structures by cooling above the T-g, and can be reversed by heating above the T-g, showing a triggered and on-demand structural reorganization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Composites
Weizhan Yang, Chao Wang, Zenghui Liu, Jinzhu Tan
Summary: A novel HNBR composite filled with organically modified Al2O3 nanoparticle was fabricated and its properties were studied. The addition of nano-Al2O3 promoted the vulcanization process, improved mechanical properties, and reduced friction and wear of the HNBR composite. The performance of the composite improved with the decrease in nano-Al2O3 particle size.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Netnapha Kamlangmak, Utt Eiamprasert, Preeyaporn Chaiyasat, Amorn Chaiyasat
Summary: The study demonstrates the synthesis of multifunctional polymer particles containing quaternary ammonium molecules by emulsion iodine transfer polymerization, showing excellent antimicrobial properties and high colloidal stability for applications in cutting oils, Pickering emulsions, and other fields.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Xinyi Luo, Zongchuan Li, Li Zhang, Ying Chen, Jianbo Tan
Summary: Heterogeneous reversible addition-fragmentation chain transfer (RAFT) polymerization is a significant method for preparing well-defined block copolymers and block copolymer nanoparticles. This study investigates the influence of different positions of macro-RAFT agents on RAFT dispersion polymerization and demonstrates that a binary mixture of R-type and Z-type macro-RAFT agents can address the issue of uncontrolled polymerization. Additionally, the use of RAFT seeded dispersion polymerization improves the RAFT controllability. The study also reveals that the spatial distribution of RAFT groups significantly affects the morphologies of block copolymer nanoparticles.
Article
Chemistry, Multidisciplinary
A. Czajka, G. Liao, O. O. Mykhaylyk, S. P. Armes
Summary: This study focuses on the formation of polymer/silica nanocomposite particles through surfactant-free aqueous emulsion polymerization, monitoring key parameters using various techniques to understand the process.
Article
Chemistry, Applied
Hujun Xie, Fangfang Ni, Jian Gao, Chengzhi Liu, Jieyu Shi, Gerui Ren, Shiyi Tian, Qunfang Lei, Wenjun Fang
Summary: Peppermint oil emulsions were successfully prepared using zein-lecithin-EGCG complex nanoparticles as emulsifiers. The optimal conditions for the preparation of emulsions were determined, and the stability mechanism of the emulsions was explored. The electronic experiments demonstrated the stability and distinguishability of the emulsions.
Article
Engineering, Mechanical
Xu Cao, Xigang Yang, Yuening Li, Xin Zhang, Tiancheng Ai, Guoshun Pan, Dan Guo, Guoxin Xie
Summary: In this study, polystyrene-poly alpha olefin (PAO) nanocapsules were synthesized and their impact on self-lubrication behavior was analyzed. The results showed that the nanocapsules and nanoparticles exhibited mixed lubrication, while PAO oil exhibited boundary lubrication. Factors such as load, operating temperature, PAO types, and MoDTC additives were found to influence the lubrication performance. By adding MoDTC additives, the friction coefficient of the nanocapsules decreased by 83.15%. This study provides valuable insights into mixed lubrication and has potential applications in various fields.
TRIBOLOGY INTERNATIONAL
(2023)
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
Polymer Science
Zhen Lu, Huarong Liu, Xiaoling Cui, Yue Li, Zhijun Lv, Weijian Chen
Summary: In this study, fluorine-free superhydrophobic separation films were prepared by depositing polymer microspheres on stainless steel meshes. The hydrophobic meshes showed excellent oil-water separation efficiency and permeation flux, and remained stable in corrosive environments. These meshes have potential practical applications in sewage treatment or separation/purification.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
In Hwan Jung, Jieun Lee, Seung Soo Shin, Youn-Jung Kang, Tae Seok Seo, Bum Jun Park
Summary: In this study, a simple protocol for synthesizing partially etched polystyrene nanoparticles through emulsion polymerization and chemical etching is presented. By selectively dissolving weakly crosslinked portions, the surface area of the nanoparticles is increased. These partially etched nanoparticles show significantly improved emulsion stability as solid surfactants compared to intact spherical nanoparticles. Our research contributes to the field of nanoparticle shape control and provides insights into developing novel materials for various applications, particularly in the area of solid surfactant usage. The importance of conducting cellular toxicity studies using these partially etched nanoparticles for future work is also emphasized.
Article
Chemistry, Multidisciplinary
Csilla Gyorgy, Paul M. Kirkman, Thomas J. Neal, Derek H. H. Chan, Megan Williams, Timothy Smith, David J. Growney, Steven P. Armes
Summary: Epoxy-functional sterically-stabilized diblock copolymer nanoparticles were prepared and their adsorption behavior on stainless steel was studied. The introduction of epoxy groups led to a significant increase in adsorbed amount compared to functional or non-functional nanoparticles. Chemical adsorption of epoxy-functional nanoparticles resulted in a reduction in friction at elevated temperatures.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Qin Yu, Kaoping Song, Jiangchao Cai, Jihang Li, Tenglong Gao
Summary: The study focused on developing an intelligent sustained-release microgel to address the uncertainty of pore radius caused by long-term water flooding in deep reservoirs, aiming to improve the plugging performance of polymer microspheres.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
M. R. Noor El-Din, A. Hashem, R. E. Morsi, A. Abd El-Azeim
Summary: This study synthesized three different copolymers and two functionalized SiO2 nanoparticles to successfully fabricate superhydrophobic coating films, with M-composite achieving the highest static contact angle.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Chengcheng Yu, Yangchuan Ke, Xu Hu, Yi Zhao, Qingchun Deng, Shichao Lu
Article
Chemistry, Multidisciplinary
Chengcheng Yu, Xu Hu, Shichao Lu, Yangchuan Ke, Jianbin Luo
Summary: This study investigated the effects of different treatments on the properties of montmorillonite samples, with triple-functionalized Mt showing improved thermal stability compared to double-functionalized samples.