A Novel Method to Prepare Nano-Structured Semi-Conducting Polythiophenes by Supercritical Process

Rapid Expansion of Supercritical carbon dioxide Solutions (RESS) containing CO2-soluble, fluorinated ester substituted polythiophene: poly[2-(3-thienyl)acetyl ,3,4,4,5,5,6,6- 7,7,8,8,8,tridecafluoro-1-octanate] (PSFTE) through a small heated micro-orifice (150 .m) produces nanoparticles in the size range of 50 - 300 nm. Pre-expansion temperatures and pressures were found to have marked impact on particle size and morphology. While the particle size increased with more agglomeration with increase in temperature, smaller and spherical particles were produced with increase in pressure owing to the higher solubility of PSFTE in CO2 at high pressures.

Download Full-text

New Method of Postmodifying the Particle Size and Morphology of LiFePO4 via Supercritical Carbon Dioxide

Crystal Growth & Design ◽

10.1021/cg3003146 ◽

2012 ◽

Vol 12 (5) ◽

pp. 2166-2168 ◽

Cited By ~ 13

Author(s):

Ming Xie ◽

Xiaoxue Zhang ◽

Jarmo Laakso ◽

Hao Wang ◽

Erkki Levänen

Keyword(s):

Carbon Dioxide ◽

Particle Size ◽

Supercritical Carbon Dioxide ◽

New Method ◽

Particle Size And Morphology ◽

Size And Morphology ◽

Supercritical Carbon

Download Full-text

Particle Size and Morphology of Carbon Dioxide Reduction Electrocatalysts Fabricated By Pulse/Pulse-Reverse Electrodeposition

ECS Meeting Abstracts ◽

10.1149/ma2019-02/21/1048 ◽

2019 ◽

Keyword(s):

Carbon Dioxide ◽

Particle Size ◽

Carbon Dioxide Reduction ◽

Pulse Reverse ◽

Particle Size And Morphology ◽

Size And Morphology

Download Full-text

Effect of Carbon Source Content on the Carbothermal Synthesis of AlN Powders Using a Combustion Synthesis Precursor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.526 ◽

2012 ◽

Vol 554-556 ◽

pp. 526-531

Author(s):

Ai Min Chu ◽

Ming Li Qin ◽

Bao Rui Jia ◽

Hui Feng Lu

Keyword(s):

Particle Size ◽

Carbon Source ◽

Combustion Synthesis ◽

Aluminum Nitrate ◽

Spherical Particles ◽

Molar Ratio ◽

Mixed Solution ◽

Particle Size And Morphology ◽

Size And Morphology ◽

Average Size

AlN powders were synthesized by carbothermal reduction method using a combustion synthesis precursor derived from aluminum nitrate (oxidizer), glucose (carbon source), and urea (fuel) mixed solution. Effects of carbon source content on the combustion temperature of solutions, the particle size and morphology of the precursors and the synthesized AlN were studied in detail. The results indicated that a regular variation in the particle size and morphology of precursors had been observed with the increasing molar ratio of glucose to aluminum nitrate (C/Al). The products prepared with (C/Al=8–12), calcined at 1500 oC for 2 h, could have completed the nitridation reaction, while the nitridation products prepared with (C/Al=4 and 16) are opposite. The nitridation products prepared with (C/Al=8–12), calcined at 1500 oC for 2 h, are comprised of well-distributed spherical particles of AlN with the average size ranging from 50 to 80 nm.

Download Full-text

Solubility and micronisation of phenacetin in supercritical carbon dioxide

Chemical Papers ◽

10.2478/s11696-013-0328-6 ◽

2013 ◽

Vol 67 (5) ◽

Cited By ~ 5

Author(s):

Xing Wu ◽

Jian-Min Yi ◽

Yue-Jin Liu ◽

Yong-Bing Liu ◽

Pan-Liang Zhang

Keyword(s):

Experimental Data ◽

Carbon Dioxide ◽

Supercritical Carbon Dioxide ◽

Rapid Expansion ◽

Nano Particles ◽

Isothermal Method ◽

Size And Morphology ◽

Semi Empirical ◽

Low Solubility ◽

Supercritical Carbon

AbstractThe rapid expansion of a supercritical solution (RESS) process represents an attractive prospect for producing sub-micron and nano-particles of medical compounds with low solubility. The solubility of phenacetin in supercritical carbon dioxide was measured by the analytical-isothermal method at pressures ranging from 9.0 MPa to 30.0 MPa and temperatures ranging from 308.0 K to 328.0 K. The results show that the mole fraction solubility of phenacetin in supercritical carbon dioxide is up to 10−5. Four density-based semi-empirical models were introduced to correlate the experimental data. Agreement between the model predictions and experimental data is greater with the Adachi-Lu-modified Chrastil model than with the Chrastil model, Méndez-Santiago-Teja model, and the Bartle model and the average absolute relative deviation (AARD) observed is 0.0483. The preparation of fine phenacetin particles by the RESS process under different conditions of extraction temperatures (308.0–328.0 K), extraction pressures (9.0–30.0 MPa), nozzle temperatures (373.0–393.0 K), nozzle diameters (0.1–0.8 mm), and collection distance (20.0–40.0 mm) was investigated. The size and morphology of the resultant particles were analysed by SEM. A remarkable modification in size and morphology can be obtained by condition-optimisation.

Download Full-text

Direct manipulation of particle size and morphology of ordered mesoporous silica by flow synthesis

RSC Advances ◽

10.1039/c4ra16679e ◽

2015 ◽

Vol 5 (18) ◽

pp. 13331-13340 ◽

Cited By ~ 27

Author(s):

T. N. Ng ◽

X. Q. Chen ◽

K. L. Yeung

Keyword(s):

Particle Size ◽

Mesoporous Silica ◽

Hollow Spheres ◽

Ordered Mesoporous Silica ◽

Direct Manipulation ◽

Flow Synthesis ◽

Precise Control ◽

Ordered Mesoporous ◽

Particle Size And Morphology ◽

Size And Morphology

Flow-synthesis of mesoporous silica allows deliberate and precise control over the size and shapes and enables the preparation of complex microstructures (i.e., hollow spheres).

Download Full-text

Dehumidified Air-Assisted Spray-Drying of Cloudy Beetroot Juice at Low Temperature

Applied Sciences ◽

10.3390/app11146578 ◽

2021 ◽

Vol 11 (14) ◽

pp. 6578

Author(s):

Aleksandra Jedlińska ◽

Alicja Barańska ◽

Dorota Witrowa-Rajchert ◽

Ewa Ostrowska-Ligęza ◽

Katarzyna Samborska

Keyword(s):

Particle Size ◽

Physicochemical Properties ◽

Spray Drying ◽

Low Temperatures ◽

Beetroot Juice ◽

Particle Size And Morphology ◽

Size And Morphology ◽

Tapped Density ◽

Lower Loss ◽

Better Than

This paper discusses the physicochemical properties of powders obtained by spray drying of cloudy beetroot juice, using dehumidified air in variants with or without carriers. The inlet air temperature was 130 °C or 90 °C, and the addition of the carriers was at a ratio of juice to carrier solids of 3:2. In the obtained powders, the following physicochemical properties were determined: water content and water activity, apparent density, loose and tapped density, porosity, flowability, particle size and morphology, and the content and retention of betalains. It was possible to dry cloudy beetroot juice without the use of carriers at low temperatures (90 or 130 °C). The 100% beetroot powders were characterized by satisfactory physicochemical properties, often better than those with carriers (including lower hygroscopicity and higher color saturation and yield). A lower loss of betalains was found for the powders with the addition of carriers. The best process yields were obtained for the powder without carriers at 130 °C and 90 °C.

Download Full-text

Synthesis and Properties of (Bi0.5Na0.5)TiO3 Powders by Hydrothermal Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.140 ◽

2007 ◽

Vol 336-338 ◽

pp. 140-142

Author(s):

Jun Jie Hao ◽

Xiao Hui Wang ◽

Shi Yun Lin ◽

Long Tu Li

Keyword(s):

Particle Size ◽

Hydrothermal Method ◽

Single Phase ◽

Piezoelectric Ceramics ◽

Treatment Temperature ◽

Lead Free ◽

Excellent Candidate ◽

Traditionally Prepared ◽

Particle Size And Morphology ◽

Size And Morphology

Na0.5Bi0.5TiO3 (NBT) is considered to be an excellent candidate for lead-free piezoelectric ceramics. In this study, we propose a hydrothermal method for the preparation of single phase NBT powder at relatively low treatment-temperature. The particle size and morphology of the synthesized powders were examined by SEM. The powders were further pressed into disk and sintered at 1120°C/2h in air, and its properties and microstructure were compared with traditionally prepared samples.

Download Full-text