Search

• A novel fluorine-containing PINF membrane with high whiteness has been prepared from 6FDA and TFMB via electrospinning technology. • The as-obtained PINF membranes have a high solar reflection of 95.5% (0.4–0.8 µm) and infrared emissivity of 88.0% (8–13 µm). • The PINF membranes display strong UV shielding properties and excellent thermal stability with no obvious weight loss before 500 ℃. • The daytime radiative cooling effect of PINF membranes maintains constant in the aging test for continuous 720 h. Personal daytime radiative cooling (PDRC) materials have high sunlight reflection and high selective emissivity to outer space in the main atmospheric window, demonstrating huge potential in energy-saving for sustainable development. Recently, polymer-based membranes for radiative cooling have been widely reported, due to their easy processing, low cost, and unique optical performance. However, the desired high sunlight reflectance of PDRC materials is easily dampened by environmental aging, high temperature, and ultraviolet (UV) irradiation, resulting in reduced cooling performance for most polymers, adverse to large-scale practical applications. In this work, we demonstrate a novel polyimide nanofiber (PINF) membrane with a fluorine-containing structure via typical electrospinning technology. The resultant PINF membrane exhibits high sunlight reflectance, UV resistance, and excellent thermal stability, rendering anti-aging daytime radiative cooling. The sunlight reflectance of PINF membranes could maintain constant in the aging test for continuous 720 h under outdoor solar irradiation, exhibiting durable and long-term personal daytime radiative cooling performance. [Display omitted] [ABSTRACT FROM AUTHOR]

Lead-free Na 0.5 Bi 0.5 TiO 3 (NBT) nanofibers with the perovskite structure were prepared by the electrospinning method. The nanofibers were about 200–300 nm in diameter and up to several hundred microns in length. The crystal structures and morphologies of the nanofibers were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The effective piezoelectric property of individual NBT nanofiber was examined by piezoresponse force microscopy (PFM). The NBT nanofibers crystallized in pure perovskite phase after annealing above 700 °C in air and comprised a great number of fine particles with size of 60–80 nm. In addition, the electromechanical energy conversion models for NBT nanofibers were built and demonstrated high voltage output as high as several millivolts. Such a result qualifies NBT nanofibers as a promising candidate for lead-free electromechanical conversion devices. [ABSTRACT FROM AUTHOR]

The use of nanotechnology in the textile industry has increased rapidly due to its unique and valuable properties. Electrospinning is a novel process for producing superfine nanofibers. Special properties make them suitable for a wide range of applications from medical to consumer products and industrial to high-tech applications. This paper details the different nanofiber manufacturing methods and its pro and cons. Further it explores the different principles of drug delivery and the application of nanofiber in pharmaceutical Drug Delivery System (DDS). [ABSTRACT FROM AUTHOR]

A solution-solid method is developed to construct cerium phosphate (CePO4) nanofibers. Tetraphosphoric acid formed the condensed linear polyphosphate (PnO3n+1)(n+2)- before reacting with cerium carbonate (Ce2(CO3)3) powder, which was favourable for one dimensional CePO4 nanofibers forming. The growth mechanism was proposed based on solution-solid process. CePO4 nanofibers display strong UV luminescence emission and weak blue emission. [Copyright &y& Elsevier]

The preparation of polyaniline nanofibers in aqueous solution was studied as functions of the concentrations and ratios of reactants. The morphology and microstructure of polyaniline nanofibers are affected by the concentrations and proportions of the reactants. A special kind of sea cucumber-like polyaniline nanofibers can be prepared under control of reaction conditions. Secondary growth is the formation mechanism. In addition, the bulk electrical conductivity of these sea cucumber-like polyaniline nanofibers was higher than that of other common polyaniline nanofibers. [Copyright &y& Elsevier]