Article
Environmental Sciences
Ye -Lim Han, Hye-Ran Kim, Hyun-Kyung Kim, Jae -Woo Park
Summary: A series of thermosensitive and magneto-responsive dendrimers were synthesized and their properties at different temperatures were studied. The results showed that PNIPAM-g-MCD could encapsulate and fix benzene molecules below the critical solution temperature, while it could disrupt oil-water emulsions above the critical solution temperature.
Article
Agriculture, Multidisciplinary
Elif Gokcen Ates, Maria J. Beira, Mecit H. Oztop, Pedro J. Sebastiao
Summary: This study investigated the effects of different sugar components on pectin gels using a combination of H-1 nuclear magnetic resonance (NMR) relaxometry at the molecular level and assessment of viscoelastic properties at the macroscopic level. The results showed that changes in hardness and viscosity were influenced by moisture content, while local diffusion processes probed by NMR relaxometry remained unaffected. This highlights the importance of combining micro- and macroscopic information for analyzing food product properties.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2021)
Article
Engineering, Chemical
Juanjuan Han, Shengqi Gong, Zhongshi Peng, Xueqi Cheng, Yuhan Li, Hanqing Peng, Yuchan Zhu, Zhandong Ren, Li Xiao, Lin Zhuang
Summary: The study found that the topology of comb-shaped anion exchange membranes has a significant impact on membrane properties, with membranes where side chains are grafted onto backbones showing better ion conduction and chemical stability compared to those with side chains tethered to cations. Increasing side chain length enhances the chemical stability of the membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Lukas Bauman, Quan Wen, Dan Sameoto, Choon Hwai Yap, Boxin Zhao
Summary: In this research, PNIPAAm was grafted on micro-pillared surfaces to achieve a temperature-modulated smart wetting property. PNIPAAm exhibited hydrophobicity above LCST and hydrophilicity below LCST. Grafting on micropillars enhanced the change in contact angle and accelerated graft hydration.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Biochemistry & Molecular Biology
David Joram Mendoza, Meri Ayurini, Christine Browne, Vikram Singh Raghuwanshi, George P. Simon, Joel F. Hooper, Gil Garnier
Summary: A family of thermoresponsive poly(N-isopropyla-crylamide)-grafted cellulose nanofibers was synthesized via a silver-promoted decarboxylative polymerization approach. The method allows for control over functionalization and grafting amount, and the resulting grafted nanofibers exhibit remarkable thermoresponsive properties and can be used as thermosensitive biomaterials. This study validates a novel approach for the synthesis of new thermoresponsive and transparent hydrogels.
Article
Polymer Science
Xuejun Pan, Muhammad Waqas Ishaq, Muhammad Waqas Ali, Jinxian Yang, Lianwei Li, Yougen Chen
Summary: In this study, a library of comb-like polymers with varied grafting densities was prepared and their conformational properties in solution were investigated. PEtOx-N-3 was synthesized as the grafting side chain and grafted onto PPA backbone to obtain comb-like PPA(Nb)-g-PEtOx(47)-sigma(g) samples with different grafting densities. The molecular parameters of these comb-like polymers were extracted using a Quadruple-detection size-exclusion chromatography system. The study revealed a transition in polymer shape from starlike to comb-like, and further to branched comb-like structure as the backbone length increases.
Article
Chemistry, Physical
Ao Nan Lai, Pei Zhi Zheng, Shu Chun Li, Yi Fei Zhu, Peng Cheng Hu, Shu Feng Zhou
Summary: This study presents a new approach for constructing higher-performance anion exchange membranes (AEMs) by combining block-type and comb-shaped architectures. The synthesized quaternization fluorene-containing block poly (arylene ether nitrile ketone)s exhibit efficient ion-transport channels and high hydroxide conductivities. The AEMs also demonstrate excellent anti-swelling property, mechanical properties, thermal and oxidative stability, and alkaline stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Polymer Science
Rajabali Ebrahimi
Summary: Ultrasound was used in polymerization reactions to produce hydrogels without the need for an initiator. The resulting hydrogels are formed quickly, have uniform structures, strong water absorption capabilities, and can swell in different environments. Furthermore, they exhibit high drug release rates and can be reused effectively.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
McKenzie L. Coughlin, Jerrick Edmund, Frank S. Bates, Timothy P. Lodge
Summary: Methylcellulose (MC), a water-soluble cellulose ether, exhibits thermoreversible gelation, which has multiple applications. Recent research has shown that MC gelation is caused by the formation of nanofibrils with a uniform diameter (approximately 15 nm) and that gelation can be suppressed by adding low-molecular-weight poly(ethylene glycol) along the backbone. In this study, we modify MC with thiol-terminated poly(N-isopropylacrylamide) (PNIPAm) using thiol-ene click chemistry and investigate its influence on aqueous MC solution properties. The results suggest that grafting PNIPAm increases the coil dimensions and the persistence length of MC, and it also increases the theta temperature, even though PNIPAm typically has a lower critical solution temperature. Fibril formation still occurs at high temperature for the grafted chains.
Article
Chemistry, Physical
Chao Feng, Tao Zhu, Zhong-ying Jiang, Chun-lai Ren, Yu-qiang Ma
Summary: This study reports the temperature-regulated behavior of surface density of Cy3-labeled DNA probes immobilized on PNIPAm-grafted ITO surface. The immobilization of DNA is hindered by the PNIPAm layer at 25 °C and shows non-monotonic variation depending on the PNIPAm surface coverage at 45 °C.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Biochemistry & Molecular Biology
Aleksandra Wypych-Puszkarz, Onur Cetinkaya, Jiajun Yan, Ruslana Udovytska, Jaroslaw Jung, Jacek Jenczyk, Grzegorz Nowaczyk, Stefan Jurga, Jacek Ulanski, Krzysztof Matyjaszewski, Joanna Pietrasik, Marcin Kozanecki
Summary: Core-shell nanocomposites consisting of barium titanate nanocrystals grafted onto poly(methyl methacrylate) chains were prepared. The nanocomposites exhibited enhanced dielectric permittivity and improved thermal stability. The presence of ceramic nanoparticles affected the molecular dynamics and structure of the polymer chains.
Article
Biochemistry & Molecular Biology
Riccardo Narducci, Raul Andres Becerra-Arciniegas, Luca Pasquini, Gianfranco Ercolani, Philippe Knauth, Maria Luisa Di Vona
Summary: In this study, a new ionomer was synthesized with a backbone lacking alkaline-labile C-O-C bonds and quaternary ammonium groups grafted on long side chains. The ionomer was obtained through metalation reaction and chain introduction steps. The successful functionalization of the product was confirmed by H-1-NMR spectroscopy. When blended with other polymers, the ionomer exhibited higher water uptake and ionic conductivity.
Article
Nanoscience & Nanotechnology
Xuejiao Wang, Dongzhi Yang, Ming Zhang, Qian Hu, Kejing Gao, Jingsheng Zhou, Zhong-Zhen Yu
Summary: Super-hygroscopic gels composed of calcium chloride/graphene oxide/poly(N-isopropylacrylamide) are designed for spontaneous collection of atmospheric water and solar-driven release of the absorbed water.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
Yoshikatsu Akiyama
Summary: This study examined the influence of PIPAAm graft density on PDMS surfaces and found that mechanical stretching affects surface properties and cell adhesion, leading to fibronectin denaturation on stretched surfaces and reduced cell adhesiveness. Additionally, dual stimuli of low temperature treatment and mechanical shrinking stress promoted cell detachment on stretched PDMS surfaces, highlighting the stable nature of PIPAAm grafted surfaces.
Article
Nanoscience & Nanotechnology
Barbara Casteleiro, Fernande Da Cruz-Boisson, Pierre Alcouffe, Sandra N. Pinto, Jose M. Gaspar Martinho, Marie-Therese Charreyre, Jose Paulo Sequeira Farinha, Arnaud Favier
Summary: This study reports the synthesis of biocompatible poly(N-acryloyl morpholine) (PNAM) surface-modified gold nanoclusters (AuNCs) with a diameter under 2 nm and near-infrared photoluminescence. Compared with AuNCs stabilized by small ligands, the PNAM-AuNCs exhibit better colloidal stability, increased photoluminescence lifetimes, and enhanced quantum yields. Furthermore, the properties of these PNAM-AuNCs can be successfully tuned using PNAM chains with different molecular weights. These PNAM-AuNCs provide an excellent platform for the development of bioimaging probes without organic dyes.
ACS APPLIED NANO MATERIALS
(2023)