Background: Maternal fear of childbirth fluctuates throughout pregnancy. However, no studies have investigated the changing characteristics and influencing factors of fear of childbirth.
Aims: This study aimed to identify the trajectory patterns of fear of childbirth in third-trimester primiparas and to examine the factors influencing these patterns.
Integrated monolithic electrodes (IMEs) free of inactive components demonstrate great potential in boosting energy-power densities and cycling life of lithium-ion batteries. However, their practical applications are significantly limited by low active substance loading (< 4.0 mg cm and 1.
View Article and Find Full Text PDFThe charge transfer efficiency of the solid electrolyte depends on the number of lithium ions that can be effectively transported and participate in the electrode reaction. However, limited by the strong coupling relationship between Li and Lewis basic sites on the polymer chain, the Li transference number () of the solid polymer electrolyte (SPE) based dual-ion conductor is typically low, resulting in excessive anion aggregation at the electrode side and inducing concentration polarization. In this study, we present a functionalized modified polymer electrolyte (FMPE) with selective cation transport, which was synthesized by embedding 4-(trifluoromethyl)styrene (TFS) functionalized groups onto the poly(diethylene glycol diacrylate) polymer chain.
View Article and Find Full Text PDFHigh-voltage resistant quasi-solid-state polymer electrolytes (QSPEs) are promising for enhancing the energy density of lithium-metal batteries in practice. However, side reactions occurring at the interfaces between the anodes or cathodes and QSPEs considerably reduce the lifespan of high-voltage LMBs. In this study, a copolymer of vinyl ethylene carbonate (VEC) and poly(ethylene glycol) diacrylate (PEGDA) was used as the framework, with a cellulose membrane (CE) as the supporting layer.
View Article and Find Full Text PDFSichuan Da Xue Xue Bao Yi Xue Ban
July 2023
Objective: To explore the mediating effect of childbirth self-efficacy on the impact pathway of intolerance of uncertainty on the fear of childbirth in primiparas in the second and third trimesters and the potential moderating effect of perceived partner responsiveness.
Methods: A total of 429 primiparas in their second and third trimesters completed the survey, which included general information questionnaire, Intolerance of Uncertainty Scale, Childbirth Self-Efficacy Inventory, Perceived Partner Responsiveness Scale, and Childbirth Attitudes Questionnaire. Rank sum test was used to compare the scores for the fear of childbirth among different groups and Spearman's correlation was used to analyze the scores for all the scales.
ACS Appl Mater Interfaces
February 2023
Solid polymer electrolytes (SPEs) are considered to be attractive candidates for rechargeable batteries on account of their high safety and flexible processability. However, the restricted polymer segmental dynamics limit the Li conduction of SPEs. Herein, a composite electrolyte membrane was prepared via in situ thermal-initiating polymerization of diethylene glycol diacrylate (DEGDA) in a poly(vinylidene fluoride) frameworks (PVDF FMs) electrospun in advance.
View Article and Find Full Text PDFNanostructured integrated electrodes with binder-free design show great potential to solve the ever-growing problems faced by currently commercial lithium-ion batteries such as insufficient power and energy densities. However, there are still many challenging problems limiting practical application of this emerging technology, in particular complex manufacturing process, high fabrication cost, and low loading mass of active material. Different from existing fabrication strategies, here using a CoP alloy foil as a precursor a simple neutral salt solution-mediated electrochemical dealloying method to well address the above issues is demonstrated.
View Article and Find Full Text PDFA solid-state composite polymer electrolyte comprising LiLaZrO nanofibers (LLZO NFs) as fillers has the advantages of flexibility, ease of processing, and being low cost, thus being considered to be a promising electrolyte material for use in the next generation of highly safe lithium metal batteries. However, poor compatibility of organic parts and inorganic materials leads to quick capacity decay after long-term charge/discharging running because of inorganic/organic interface deterioration and thus, the related ineffective lithium-ion (Li) conduction. Herein, a "Boston ivy-style" method is proposed to prepare a solid ceramic/polymer hybrid electrolyte that exhibits a dense interface structure.
View Article and Find Full Text PDFTwo-dimensional (2D) materials with mono or few layers have wide application prospects, including electronic, optoelectronic, and interface functional coatings in addition to energy conversion and storage applications. However, the exfoliation of such materials is still challenging due to their low yield, high cost, and poor ecological safety in preparation. Herein, a safe and efficient solid suspension-improving method was proposed to exfoliate hexagonal boron nitride nanosheets (BNNSs) in a large yield.
View Article and Find Full Text PDFThe real capacity of graphene and the lithium-storage process in graphite are two currently perplexing problems in the field of lithium ion batteries. Here we demonstrate a three-dimensional bilayer graphene foam with few defects and a predominant Bernal stacking configuration, and systematically investigate its lithium-storage capacity, process, kinetics, and resistances. We clarify that lithium atoms can be stored only in the graphene interlayer and propose the first ever planar lithium-intercalation model for graphenic carbons.
View Article and Find Full Text PDFHighly dispersed Pt nanoparticles supported on high-surface-area 3D ordered macroporous (3DOM) Ce0.6 Zr0.3 Y0.
View Article and Find Full Text PDFNanosized rod-like, wire-like, and tubular α-MnO(2) and flower-like spherical Mn(2)O(3) have been prepared via the hydrothermal method and the CCl(4) solution method, respectively. The physicochemical properties of the materials were characterized using numerous analytical techniques. The catalytic activities of the catalysts were evaluated for toluene oxidation.
View Article and Find Full Text PDF