Jie Bai

Fabrication of palladium nanoparticles-loaded carbon nanofibers catalyst for the Heck reaction

A carbon nanofibers (CNFs)-supported palladium nanoparticles (Pd NPs) catalyst was fabricated by the combination of electrospinning, gas-phase hydrogenation reduction and subsequent calcination processes. Extensive characterization of the resulting carbon nanofibers-supported palladium nanoparticles catalyst was carried out. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) images reveal that the spherical Pd NPs are well-dispersed on the surfaces of the carbon matrix or embedded in the carbon matrix without agglomerating. The cubic phase of Pd formed during the reduction and carbonization processes. Most importantly, this carbon nanofibers-supported palladium nanoparticles hybrid material exhibited enhanced activity, excellent stabilization and recyclability.

Ag nanoparticle-embedded one-dimensional β-CD/PVP composite nanofibers prepared via electrospinning for use in antibacterial material

Ag nanoparticle-embedded one-dimensional β-CD (β-cyclodextrin)/PVP composite nanofibers were prepared using a one-step electrospinning technique. Ag nanoparticles were obtained in the AgNO3/β-CD/DMF solution, in which silver nitrate been introduced as the precursor, DMF as solvent, β-CD as reducing and capping agent. After electrospinning of the composite solution at room temperature, the β-CD/PVP nanofibers containing Ag nanoparticles were obtained. The electrospun composite solution containning Ag nsnopsrticles were confirmed by UV-visible absorption spectra; the resulting composite nanofibers were characterized by scanning electron microscopy , transmission electron microscopy, and X-ray diffraction. Ag-β-CD/PVP nanofiber exhibits good antibacterial property for Escherichia coli and Staphylococcus aureus. Consequently, we propose that these Ag nanoparticle-embedded 1D-nanostructures prepared via electrospinning may be used as antibacterial material.

A Novel Approach to Prepare Gold Nanoparticles/Polyacrylamide Composite Nanofibers

Abstract Gold nanoparticles were prepared in an aqueous solution with polyacrylamide to reduce HAuCl4. The polyacrylamide played double roles in the preparation of Au nanoparticles. Firstly, it acted as reducing reagent; in addition, it also stabilized the Au nanoparticles to prevent agglomeration and provided environment for forming nanostructure around Au nanoparticles. UV-vis spectra of the Au nanocrystals colloids reveal the plasmon resonance peak position. TEM confirms the presence of gold nanoparticles in the fibers. This is a versatile and applicable approach to prepare many other combinations of functional fibers electrospun.

Experiment of Sheng Li Lignite Combustion Kinetics under Oxygen-Enriched Conditions

The characteristics of Sheng Li (China) Lignite combustion under oxygen-enriched conditions were studied by thermogravimetric analysis , including TGDTG and DTA. Experiments on lignite combustion were carried out under four kinds of oxygen-enriched conditions (O2/N2 mixture atmospheres) and with a heating rate of 10°C/min. The experiments of working temperature range was 20°C-900°C. The combustion process, regarded as the first order reaction, was analyzed through the Gorbachev kinetic equation participants, which gained the conclusion that Sheng Li lignite combustion reaction shift to low temperature zone and kinetic parameters of combustion increase gradually when oxygen concentration increase.

A Novel Approach to Prepare CaCO3/Polyvinylpyrrolidone (PVP) Composite Nanofibers

A new route to prepare CaCO3 nanoparticles/polyvinylpyrrolidone (PVP) nanofibers is reported. An aqueous solution of K2CO3 was added to a solution of CaCl2/PVP, resulting in in-situ preparation of CaCO3 nanoparticles. Then composite nanofibers containing CaCO3 nanoparticles were successfully prepared by electrospinning. The morphology of the resulting composite nanofibers was characterized by field-emission scanning electron microscopy. In addition, the products were characterized by thermogravimetry analysis and Fourier transform infrared spectra.

A Novel Method for the Preparation of PAN/β-CD/Cu Catalyst

In this paper, we reported an approach to fabricate PAN/β-cyclodextrin (β-CD) composite nanofibre with copper nanoparticles (NPs) grown on the surface by the simple electrospinning process. In the experiment, electrospinning method, soaking and adsorption method, together with reduction method were used to achieve the aim of coating. The final product was characterized using scanning electronic microscope (SEM), and fourier transform infrared spectroscopy (FTIR).

Preparation of Polyvinylpyrrolidone (PVP) Nanofibers Supported CaCO3 Nanoparticles

In this paper, a new method for the preparation of composite nanofibers surface containing calcium carbonate nanoparticles using electrospinning technology was described. In detail, firstly, the type solution is formed by the aqueous solution of CaCl2 which contains polyvinylpyrrolidone (PVP) and the other is the aqueous solution of K2CO3. Two types of solution were mixed completely, and then Ca2+ and CO32− generated CaCO3 nanoparticles. Secondly, composite nanofibers with CaCO3 nanoparticles were successfully prepared by above solution electrospun. The resulting composite nanofibers were characterized by field-emission scanning electron microscopy (FE-SEM), it determination showed that perfect mono-dispersed spherical CaCO3 nanoparticles were dispersed on polyvinylpyrrolidone (PVP) nanofibers.