scholarly journals One-step ball milling synthesis of VO2 (M) nanoparticles with exemplary thermochromic performance

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Chiyuan Wang ◽  
Huiyan Xu ◽  
Tongyao Liu ◽  
Shuaijun Yang ◽  
Yong Nie ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Ball Milling ◽  
Phase Transition Temperature ◽  
Large Scale ◽  
Molar Ratio ◽  
Ambient Conditions ◽  
Doping Amount ◽  
Smart Windows ◽  
Milling Method

AbstractVanadium dioxide (VO2) has demonstrated highly potential for smart windows because of its thermochromic property. This study represents the development of a facile but efficient method for the synthesis of VO2 (M) nanoparticles by ball milling method under ambient conditions, without release of waste liquid or gases. The key variables related to synthesis, including milling time and molar ratio of raw materials, have been investigated. It was found that the pure-phase VO2 (M) nanoparticles with the sizes of the particles ranged from 20 to 50 nm and relatively good dispersivity could be prepared by optimizing process parameters. For practice use to decrease the phase transition temperature, elemental W doping amount of 2 at.%, V1−xWxO2 (M) nanoparticles were also studied, and their glass coating exhibits high thermochromic performance with luminous transmittance (Tlum) of 44.18%, solar regulation efficiency (∆Tsol) of 9.64%, and the critical phase transition temperature (Tc) of ~ 42 °C. This work demonstrates a green and promising ball milling method to fabricate large scale VO2 (M) and V1−xWxO2 (M) nanoparticles for smart windows.

scholarly journals Tuning the Doping Ratio and Phase Transition Temperature of VO2 Thin Film by Dual-Target Co-Sputtering

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 834 ◽  
Author(s):  
Xu Chen ◽  
Mingfei Wu ◽  
Xingxing Liu ◽  
Ding Wang ◽  
Feng Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Large Scale ◽  
Scale Production ◽  
Main Component ◽  
Vo2 Thin Films ◽  
Doping Ratio ◽  
W Doping ◽  
Dual Target

A new simple way for tuning the phase transition temperature (PTT) of VO2 thin films has been proposed to solve the problem of changing the doping ratio by using the dual-target co-sputtering method. A series of samples with W doping ratios of 0%, 0.5%, 1%, 1.5% and 2% have been fabricated by sputtering V films with the power of pure and 2% W-doped V targets from 500 W: 0 W, 500 W: 250 W, 500 W: 500 W, 250 W: 500 W to 0 W: 500 W respectively and then annealed in an oxygen atmosphere to form VO2. The XRD results of both pure and W-doped VO2 samples reveal that VO2 forms and is the main component after annealing. The PTT can be tuned by controlling the sputtering power ratio of the pure and doped targets. It can be tuned easily from 64.3 °C to 36.5 °C by using the pure and 2% W-doped targets for demonstration, with W doping ratios from 0% to 2%. It is also valid for other doping elements and is a promising approach for the large-scale production of sputtering.

Controllable synthesis of VO2(D) and their conversion to VO2(M) nanostructures with thermochromic phase transition properties

2016 ◽  
Vol 3 (8) ◽  
pp. 1035-1042 ◽  
Author(s):  
Zhengdong Song ◽  
Liangmiao Zhang ◽  
Fang Xia ◽  
Nathan A. S. Webster ◽  
Jingchao Song ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Thermal Hysteresis ◽  
Controllable Synthesis ◽  
Smart Windows ◽  
Hysteresis Width ◽  
Calcination Method

VO2(M) nanostructures with lower thermochromic phase transition temperature and narrower thermal hysteresis width were synthesized by a hydrothermal-calcination method, making them suitable candidates for smart windows.

Designable Phase Transition Temperature of VO2 Co-Doped with Nb and W Elements for Smart Window Application

2019 ◽  
Vol 19 (11) ◽  
pp. 7185-7191
Author(s):  
Hee Jung Kim ◽  
Dong Kyu Roh ◽  
Jung Whan Yoo ◽  
Dae-Sung Kim
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Solar Modulation ◽  
Smart Window ◽  
Smart Windows ◽  
Co Doping ◽  
Window Applications ◽  
Nb Dopant ◽  
Co Doped

Monoclinic vanadium dioxide (VO2 (M)) particles co-doped with niobium and tungsten, with potential application in smart windows, were synthesized by hydrolysis and subsequent thermal decomposition of vanadyl sulfate. All the doped VO2 particles exhibited a monoclinic crystalline phase and the critical phase transition temperature (Tc) of VO2 (M) was adjusted by Nb and W co-doping. The Tc of Nb-doped VO2 (M) decreased at a rate of approximately 10 °C/at% Nb dopant, and the transition temperature could also be accurately controlled to room temperature (about 27 °C) by co-doping with Nb and W. A film prepared using co-doped VO2 (M) particles showed a solar modulation ability of ~18% and a luminous transmittance of 40%, indicating that the co-doped VO2 (M) particles represent suitable candidates for smart window applications.

Boron doped M-phase VO2 nanoparticles with low metal-insulator phase transition temperature for smart windows

2020 ◽  
Vol 46 (4) ◽  
pp. 4786-4794 ◽  
Author(s):  
Qiaoting Zhou ◽  
Weizhong Lv ◽  
Qi Qiu ◽  
Tianzi Zhou ◽  
Chunbo Huang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Metal Insulator ◽  
Smart Windows ◽  
Boron Doped ◽  
M Phase ◽  
Insulator Phase Transition

Characterization of polycrystalline VO2 thin film with low phase transition temperature fabricated by high power impulse magnetron sputtering

2016 ◽  
Vol 09 (02) ◽  
pp. 1650033 ◽  
Author(s):  
Tiegui Lin ◽  
Langping Wang ◽  
Xiaofeng Wang ◽  
Yufen Zhang
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Temperature ◽  
Magnetron Sputtering ◽  
Phase Transition Temperature ◽  
High Power ◽  
Photoelectron Spectroscopy ◽  
Lattice Distortion ◽  
Smart Windows ◽  
X Ray

VO2 is a unique material that undergoes a reversible phase transformation around 68[Formula: see text]C. Currently, applications of VO2 on smart windows are limited by its high transition temperature. In order to reduce the temperature, VO2 thin film was fabricated on quartz glass substrate by high power impulse magnetron sputtering with a modulated pulsed power. The phase transition temperature has been reduced to as low as 32[Formula: see text]C. In addition, the VO2 film possesses a typical metal–insulator transition. X-ray diffraction and selected area electron diffraction patterns reveal that an obvious lattice distortion has been formed in the as-deposited polycrystalline VO2 thin film. X-ray photoelectron spectroscopy proves that oxygen vacancies have been formed in the as-deposited thin film, which will induce a lattice distortion in the VO2 thin film.

Effect of Sodium Cholate on the Phase Transition Temperature of Dipalmitoyl Phosphatidylcholine

1983 ◽  
Vol 38 (3-4) ◽  
pp. 302-306 ◽  
Author(s):  
Srabani Banerjee ◽  
S. N. Chatterjee
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Sodium Cholate ◽  
Molar Ratio ◽  
Unilamellar Vesicles ◽  
Dipalmitoyl Phosphatidylcholine ◽  
Multilamellar Liposomes

On treatment with sodium cholate, the phase transition temperature (Tc) of multilamellar liposomes derived from dipalmitoyl phosphatidylcholine (DPPC) progressively decreased with increasing cholate: lipid-P molar ratio. A molar ratio of 4.5 caused a one degree depression in Tc. The unilamellar cholate vesicles of DPPC exhibited the same Tc as that of the multilamellar ones. The formation of unilamellar vesicles from the multilam ellar ones by cholate treatm ent was investigated by electron microscopy

scholarly journals Study of the interaction between the antitumour protein α-sarcin and phospholipid vesicles

1989 ◽  
Vol 258 (2) ◽  
pp. 569-575 ◽  
Author(s):  
M Gasset ◽  
A Martinez del Pozo ◽  
M Oñaderra ◽  
J G Gavilanes
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Ionic Strength ◽  
Phase Transition Temperature ◽  
Acyl Chain ◽  
Lipid Vesicles ◽  
Model Systems ◽  
Molar Ratio ◽  
Phospholipid Vesicles ◽  
Acidic Vesicles

alpha-Sarcin is a single polypeptide chain protein which exhibits antitumour activity by degrading the larger ribosomal RNA of tumour cells. We describe the interaction of a alpha-sarcin with lipid model systems. The protein specifically interacts with negatively-charged phospholipid vesicles, resulting in protein-lipid complexes which can be isolated by ultracentrifugation in a sucrose gradient. alpha-Sarcin causes aggregation of such vesicles. The extent of this interaction progressively decreases when the molar ratio of phosphatidylcholine increases in acidic vesicles. The kinetics of the vesicle aggregation induced by the protein have been measured. This process is dependent on the ratio of alpha-sarcin present in the protein-lipid system. A saturation plot is observed from phospholipid vesicles-protein titrations. The saturating protein/lipid molar ratio is 1:50. The effect produced by the antitumour protein on the lipid vesicles is dependent on neither the length nor the degree of unsaturation of the phospholipid acyl chain. However, the aggregation is dependent on temperature, being many times higher above the phase transition temperature of the corresponding phospholipid than below it. The effects of pH and ionic strength have also been considered. An increase in the ionic strength does not abolish the protein-lipid interaction. The effect of pH may be related to conformational changes of the protein. Binding experiments reveal a strong interaction between alpha-sarcin and acidic vesicles, with Kd = 0.06 microM. The peptide bonds of the protein are protected against trypsin hydrolysis upon binding to acidic vesicles. The interaction of the protein with phosphatidylglycerol vesicles does not modify the phase transition temperature of the lipid, although it decreases the amplitude of the change of fluorescence anisotropy associated to the co-operative melting of 1,6-diphenyl-1,3,5-hexatriene (DPH)-labelled vesicles. The results are interpreted in terms of the existence of both electrostatic and hydrophobic components for the interaction between phospholipid vesicles and the antitumour protein.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

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