Xu, Zuxiang; Li, Jinhui; Gao, Guorong; Wang, Zongbao; Cong, Yang; Chen, Jing; Yin, Jingbo; Nie, Lei; Fu, Jun
Tough and self-recoverable hydrogels crosslinked by triblock copolymer micelles and Fe3+ coordination
Tough hydrogels have great potentials in soft robotics, artificial muscles, tissue replacement, and so on. Here we introduce novel tough hydrogels crosslinked by triblock copolymer (F127DA) micelles and metal coordination. The gels showed outstanding tensile strength (∼1–11 MPa), toughness (∼4–32 MJ m−3), and excellent self-recovery properties (∼56.8–87.2% toughness recovery in…
Temperature-Dependent Order-to-Order Transition of Polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene Triblock Copolymer under Multilayered Confinement
Tan, Xiao; Li, Jiang; Guo, Shaoyun
The order-to-order transition (OOT) plays a key role in the nanotechnological applications of block copolymer (BCP) and is dramatically dependent on the spatial environment. A multilayer-confined space has been fabricated by layer-multiplying coextrusion technology to investigate the OOT mechanism of polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene triblock copolymer (SEBS) under…
Yerba Mate applications: Magnetic response of powders and colloids of iron oxide nanoparticles coated with Ilex paraguariensis derivatives
Mercado, D. Fabio; Cipollone, Mariano; González, Mónica C.; Sánchez, Francisco H.
A co-precipitation synthesis method was used to obtain iron oxide nanoparticles coated with Yerba Mate (Ilex paraguariensis) extract. These particles have a core–shell structure with the iron oxide phase surrounded by an organic shell provided by an organic component which come from the Yerba Mate extract. Obtained nanoparticles were exhaustively…
Transparent, Anisotropic Biofilm with Aligned Bacterial Cellulose Nanofibers
Wang, Sha; Li, Tian; Chen, Chaoji; Kong, Weiqing; Zhu, Shuze; Dai, Jiaqi; Diaz, Alfredo J.; Hitz, Emily; Solares, Santiago D.; Li, Teng; Hu, Liangbing
Cellulose nanofibrils are attractive as building blocks for advanced photonic, optoelectronic, microfluidic, and bio-based devices ranging from transistors and solar cells to fluidic and biocompatible injectable devices. For the first time, an ultrastrong and ultratough cellulose film, which is composed of densely packed bacterial cellulose (BC) nanofibrils with hierarchical fibril…
Transformable masks for colloidal nanosynthesis
Wang, Zhenxing; He, Bowen; Xu, Gefei; Wang, Guojing; Wang, Jiayi; Feng, Yuhua; Su, Dongmeng; Chen, Bo; Li, Hai; Wu, Zhonghua; Zhang, Hua; Shao, Lu; Chen, Hongyu
The synthesis of patchy colloids is limited by poor control over the location and shape of ligand domains. Here, the authors use adaptable polymer masks to protect select areas of the particle during functionalization, allowing them to create patchy colloids with unconventional surface…
Structural Characterization of Biocompatible Reverse Micelles Using Small-Angle X-ray Scattering, 31P Nuclear Magnetic Resonance, and Fluorescence Spectroscopy
Odella, Emmanuel; Falcone, R. Darío; Ceolín, Marcelo; Silber, Juana J.; Correa, N. Mariano
The most critical problem regarding the use of reverse micelles (RMs) in several fields is the toxicity of their partial components. In this sense, many efforts have been made to characterize nontoxic RM formulations on the basis of biological amphiphiles and/or different oils. In this contribution, the microstructure of biocompatible…
Synthesis and characterization of poly(ester amide amide)s of different alkylene chain lengths
Girard, Clément; Gupta, Manisha; Lallam, Abdelaziz; Anokhin, Denis V.; Bovsunovskaya, Polina V.; Akhyamova, Azaliya F.; Melnikov, Alexey P.; Piryazev, Alexey A.; Rodygin, Alexander I.; Rychkov, Andrey A.; Grafskaya, Kseniia N.; Shabratova, Ekaterina D.; Zhu, Xiaomin; Möller, Martin; Ivanov, Dimitri A.
In this work, a series of aliphatic biodegradable poly(ester amide amide) polymers was synthesized by melt polycondensation of a tailor-made amide-containing monomer based on 1,4-diaminobutane and ε-caprolactone and different dicarboxylic acid methyl esters with even number of methylene groups. The synthesized polymers were characterized by 1H NMR, FT-IR spectroscopy, GPC,…
Subsequent but Independent Cavitation Processes in Isotactic Polypropylene during Stretching at Small- and Large-Strain Regimes
Lyu, Dong; Chen, Ran; Lu, Ying; Men, Yongfeng
Isotactic polypropylene (iPP) samples with different molecular weights were used to investigate the relationship between cavitation processes triggered at small- and large-strain regimes. The cavitation triggered at large strains was observed in all deformation cases regardless of the occurrence of cavitation activated at small strain. The initiation of the large-strain-cavitation…
Supramolecular self-assembly of thiol functionalized pentaalkynylbenzene-decorated gold nanoparticles exhibiting a room temperature discotic nematic liquid crystal phase
Gupta, Monika; Mohapatra, Subhransu Sekhar; Dhara, Surajit; Pal, Santanu Kumar
Thiol terminated pentaalkynylbenzene (PA) units were synthesized for coating on gold nanoparticles (GNPs) in order to obtain materials with a combination of the properties of GNPs and discotic nematogens. The PA unit with the longest terminal alkyl spacer was found to exhibit a discotic nematic (ND) mesophase at room temperature…
Structural transformation from shish-kebab crystals to micro-fibrils through hot stretching process of gel-spun ultra-high molecular weight polyethylene fibers with high concentration solution
An, Minfang; Lv, You; Yao, Guibin; Zhang, Li; Wang, Zongbao
Structural evolution of gel-spun ultra-high molecular weight polyethylene fibers with high concentration solution via hot stretching process was investigated by in situ small-angle X-ray scattering, in situ wide-angle X-ray diffraction measurements, scanning electron microscopy, and differential scanning calorimetry. With the increase of stretching strain, the long period continuously increases…