enhanced properties
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Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 199
Author(s):  
Lucie Zárybnická ◽  
Radek Ševčík ◽  
Jaroslav Pokorný ◽  
Dita Machová ◽  
Eliška Stránská ◽  
...  

Nowadays, additive manufacturing—also called 3D printing—represents a well-established technology in the field of the processing of various types of materials manufacturing products used in many industrial sectors. The most common type of 3D printing uses the fused filament fabrication (FFF) method, in which materials based on thermoplastics or elastomers are processed into filaments. Much effort was dedicated to improving the properties and processing of such printed filaments, and various types of inorganic and organic additives have been found to play a beneficial role. One of them, calcium carbonate (CaCO3), is standardly used as filler for the processing of polymeric materials. However, it is well-known from its different applications that CaCO3 crystals may represent particles of different morphologies and shapes that may have a crucial impact on the final properties of the resulting products. For this reason, three different synthetic polymorphs of CaCO3 (aragonite, calcite, and vaterite) and commercially available calcite powders were applied as fillers for the fabrication of polymeric filaments. Analysis of obtained data from different testing techniques has shown significant influence of filament properties depending on the type of applied CaCO3 polymorph. Aragonite particles showed a beneficial impact on the mechanical properties of produced filaments. The obtained results may help to fabricate products with enhanced properties using 3D printing FFF technology.


Author(s):  
Ken Aldren Aldren Usman ◽  
Jizhen Zhang ◽  
Ya Yao ◽  
Si Qin ◽  
Peter Lynch ◽  
...  

The liquid crystal (LC) phases of two-dimensional (2D) transition metal carbides/nitrides (MXenes) has enabled the production of their unique macro-architectures with ordered microstructure and enhanced properties. However, LC phases in...


Carbon ◽  
2022 ◽  
Vol 186 ◽  
pp. 238-252
Author(s):  
Yuanyuan Li ◽  
Lixue Gai ◽  
Guilin Song ◽  
Qingda An ◽  
Zuoyi Xiao ◽  
...  

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Ning Xu ◽  
Kexin Huang ◽  
Weiguang Li ◽  
Xin Han ◽  
Lijuan Han ◽  
...  

Cement emulsified asphalt (CEA) mortars achieve insufficient bond strength with substrate cement concrete slab. To ameliorate problems emerging from this, the emulsified asphalt (EA) in CEA mortars was partly replaced by epoxy emulsion (EE) at contents of 0%, 10%, 20%, and 30%, yielding CEA mortars with enhanced properties. The bond strength, mechanical strength, toughness, and durability (including drying shrinkage and erosion resistance) of modified CEA mortars were assessed. The results showed that partial replacement of EA with EE improved the bond strength, mechanical strength, drying shrinkage, and erosion resistance of CEA mortars. A good correlation was found between the proportions of the EE replacement and the bond strength of CEA mortars. Partial replacement of EA with a small amount of EE exerted no significant effect on the toughness of CEA mortar. The stronger network structure of CEA mortars containing EE improved the compactness, thus improving the performance of CEA mortars. Based on these findings, EE is suggested as partial replacement of EA for enhancing the properties of CEA mortars.


Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3920
Author(s):  
Pedro Mena-Giraldo ◽  
Jahir Orozco

Smart polymer-based micro/nanoassemblies have emerged as a promising alternative for transporting and delivering a myriad of cargo. Cargo encapsulation into (or linked to) polymeric micro/nanocarrier (PC) strategies may help to conserve cargo activity and functionality when interacting with its surroundings in its journey to the target. PCs for cargo phototriggering allow for excellent spatiotemporal control via irradiation as an external stimulus, thus regulating the delivery kinetics of cargo and potentially increasing its therapeutic effect. Micromotors based on PCs offer an accelerated cargo–medium interaction for biomedical, environmental, and many other applications. This review collects the recent achievements in PC development based on nanomicelles, nanospheres, and nanopolymersomes, among others, with enhanced properties to increase cargo protection and cargo release efficiency triggered by ultraviolet (UV) and near-infrared (NIR) irradiation, including light-stimulated polymeric micromotors for propulsion, cargo transport, biosensing, and photo-thermal therapy. We emphasize the challenges of positioning PCs as drug delivery systems, as well as the outstanding opportunities of light-stimulated polymeric micromotors for practical applications.


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