Improved Synthesis of Superconducting Carbon-Doped MgB2 Using a Biopolymer for Simultaneous Crystallite Size Control and Chemical Reduction

In this work, silver nanoparticles (Ag NPs) were synthesized using a chemical reduction approach and a pulsed laser fragmentation in liquid (PLFL) technique, simultaneously. A laser wavelength of 532 nm was focused on the as produced Ag NPs, suspended in an Origanum majorana extract solution, with the aim of controlling their size. The effect of liquid medium concentration and irradiation time on the properties of the fabricated NPs was studied. While the X-ray diffraction (XRD) pattern confirmed the existence of Ag NPs, the UV–Vis spectrophotometry showed a significant absorption peak at about 420 nm, which is attributed to the characteristic surface plasmon resonance (SPR) peak of the obtained Ag NPs. By increasing the irradiation time and the Origanum majora extract concentration, the SPR peak shifted toward a shorter wavelength. This shift indicates a reduction in the NPs’ size. The effect of PLFL on size reduction was clearly revealed from the transmission electron microscopy images. The PLFL technique, depending on experimental parameters, reduced the size of the obtained Ag NPs to less than 10 nm. The mean zeta potential of the fabricated Ag NPs was found to be greater than −30 mV, signifying their stability. The Ag NPs were also found to effectively inhibit bacterial activity. The PLFL technique has proved to be a powerful method for controlling the size of NPs when it is simultaneously associated with a chemical reduction process.

Download Full-text

Synthesis of carbon-doped MgB2 superconducting nanowires

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2011.10.010 ◽

2011 ◽

Vol 131 (1-2) ◽

pp. 37-40

Author(s):

Shao-Min Zhou ◽

Yao-Ming Hao ◽

Shi-Yun Lou ◽

Yong-Qiang Wang

Keyword(s):

Superconducting Nanowires ◽

Carbon Doped ◽

Doped Mgb2

Download Full-text

Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films

Applied Physics Letters ◽

10.1063/1.2775088 ◽

2007 ◽

Vol 91 (8) ◽

pp. 082513 ◽

Cited By ~ 16

Author(s):

Y. Zhu ◽

D. C. Larbalestier ◽

P. M. Voyles ◽

A. V. Pogrebnyakov ◽

X. X. Xi ◽

...

Keyword(s):

Thin Films ◽

Chemical Vapor Deposition ◽

Critical Field ◽

Vapor Deposition ◽

Chemical Vapor ◽

Carbon Doped ◽

Physical Chemical ◽

Doped Mgb2

Download Full-text

Investigation on Phase and Microstructure Comparison of Pure and Carbon-Doped MgB2 Superconducting Bulks during Acid Exposure

Rare Metal Materials and Engineering ◽

10.1016/s1875-5372(10)60050-1 ◽

2009 ◽

Vol 38 (9) ◽

pp. 1526-1529

Author(s):

Xiong Xiaomei ◽

Yan Guo ◽

Liu Guoqing ◽

Wang Qingyang ◽

Feng Yong

Keyword(s):

Acid Exposure ◽

Carbon Doped ◽

Doped Mgb2

Download Full-text

Phonon spectra in pure and carbon doped MgB2 by inelastic X-ray scattering

Physica C Superconductivity ◽

10.1016/j.physc.2007.01.028 ◽

2007 ◽

Vol 456 (1-2) ◽

pp. 83-91 ◽

Cited By ~ 27

Author(s):

Alfred Q.R. Baron ◽

Hiroshi Uchiyama ◽

Satoshi Tsutsui ◽

Yoshikazu Tanaka ◽

Daisuke Ishikawa ◽

...

Keyword(s):

X Ray ◽

Carbon Doped ◽

X Ray Scattering ◽

Phonon Spectra ◽

Doped Mgb2 ◽

Ray Scattering

Download Full-text

High performance LiMnPO4/C prepared by a crystallite size control method

Journal of Materials Chemistry A ◽

10.1039/c4ta03311f ◽

2014 ◽

Vol 2 (36) ◽

pp. 15070-15077 ◽

Cited By ~ 40

Author(s):

Ming Zhao ◽

Yu Fu ◽

Ning Xu ◽

Guoran Li ◽

Mengtao Wu ◽

...

Keyword(s):

Crystallite Size ◽

High Performance ◽

Control Method ◽

Rate Capability ◽

Size Control ◽

High Rate ◽

Cycle Stability ◽

High Rate Capability ◽

Discharge Potential ◽

Potential Plateau

The as-prepared LiMnPO4/C sample presents higher discharge potential plateau, larger discharge capacity, excellent high-rate capability, and good cycle stability.

Download Full-text

Size/Shape Controlled Synthesis of Au/Tio2 Nano-Composites

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b1171.1292s219 ◽

2019 ◽

Vol 9 (2S2) ◽

pp. 715-719

Keyword(s):

Chemical Reduction ◽

Size Control ◽

Nano Composites ◽

Controlled Synthesis ◽

Control Parameters ◽

New Strategy ◽

Shape Controlled ◽

Supported Gold Nanoparticles ◽

Supported Gold ◽

Phase Chemical

In order to control the size of titania supported gold nanoparticles, a new strategy of liquid phase chemical reduction has been demonstrated. It involves on-site reduction of gold phase by glycerol due to thermal treatment. In the first step DPU process is performed prior to chemical reduction. The results show that, this method offers many size-control parameters including mainly reduction temperature and catalyst to glycerol ratio. This paper analyzes various aspects of the different approaches attempted to control the size/shape of the titania supported gold.

Download Full-text