Due to their excellent biocompatibility, outstanding
mechanical
properties, high strength-to-weight ratio, and good corrosion resistance,
titanium (Ti) alloys are extensively used as implant materials in
artificial joints. However, Ti alloys suffer from poor wear resistance,
resulting in a considerably short lifetime. In this study, we demonstrate
that the chemical self-assembly of novel two-dimensional (2D) diamond
nanosheet coatings on Ti alloys combined with natural silk fibroin
used as a novel lubricating fluid synergistically results in excellent
friction and wear performance. Linear-reciprocating sliding tests
verify that the coefficient of friction and the wear rate of the diamond
nanosheet coating under silk fibroin lubrication are reduced by 54
and 98%, respectively, compared to those of the uncoated Ti alloy
under water lubrication. The lubricating mechanism of the newly designed
system was revealed by a detailed analysis of the involved microstructural
and chemical changes. The outstanding tribological behavior was attributed
to the establishment of artificial joint lubrication induced by the
cross binding between the diamond nanosheets and silk fibroin. Additionally,
excellent biocompatibility of the lubricating system was verified
by cell viability, which altogether paves the way for the application
of diamond coatings in artificial Ti joint implants.
A theoretical study of the electric-field effect on the electronic structures and related properties of the cation compound containing 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and imidazole unit has been carried out, using the density functional theory (DFT) at the (U) B3LYP/6-31+G(d,p) level. The changes and regularities of geometric and electronic properties of the researched compound under electric field were revealed in detail. The results show the following: (1) Electric field has a very important effect on the orbital energy, dipole moment, natural population, and structure of the cation compound. Most of these properties are changed orderly with the increase of the electric-field intensity. (2) It is very interesting to find that in the present different electric-field intensities, the structure of cation compound after getting an electron becomes bis-radical form, that is, no mater in or out of electric-field, the cation compound will exist in a triplet state after getting an electron. (3) When getting an electron, the change of the cation structure mainly appears on the imizadole head, and when losing an electron, the change mainly appears on the TEMPO head. These theoretical results considering the electric-field effect for the cation compound help to explain the related experimental phenomena and further to direct the functional molecular design of this kind of compound.
dimers, which are further connected into a three-dimensional supramolecular networks through π-π stacking interaction and hydrogen bonds. The solid state photoluminescent studies reveal good fluorescent properties of the pytbzim ligand and complexes 1-2 at room temperature.
Through the transformation of basic equipment, this paper realizes the control of the stable resin content of prepreg yarn while fully maintaining the impregnation. Through the research on the resin curing process, resin content, and aging degree of the resin system during the prepreg manufacturing process, the resin content and aging process of the prepreg corresponding to the optimal tensile performance of the NOL ring were determined, and a high-tension winding method was obtained. The prepreg yarn MP01/HF30F/28 prepreg yarn. During the manufacturing process of wound gas cylinders, through the research on the curing system and layup design, the burst strength of dry wound gas cylinders reached 68.5MPa, and the corresponding fiber performance conversion rate was 81.2%, which exceeded that of wet-sprayed wet-spun fibers. The blasting performance conversion rate of wound gas cylinders is 19.8%. Thus opening up a new application method of wet-jet wet-spun carbon fiber in the field of winding.
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