Ammonia-etching-assisted nanotailoring of manganese silicate boosts faradaic capacity for high-performance hybrid supercapacitors

2020 ◽  
Vol 4 (5) ◽  
pp. 2220-2228 ◽  
Author(s):  
Xueying Dong ◽  
Yifu Zhang ◽  
Qiang Chen ◽  
Hanmei Jiang ◽  
Qiushi Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
High Performance ◽  
Average Particle Size ◽  
Average Particle ◽  
Manganese Silicate ◽  
Hybrid Supercapacitors ◽  
20 Nm

Nanotailoring of active manganese silicate with an average particle size of about 20 nm is realized by an ammonia-etching-assisted route, delivering a 3.55-times higher faradaic capacity than the traditional yolk–shell counterpart in hybrid supercapacitors.

Ce Basic Hydroxycarbonate Complexe as Precursor for Mesoporous Ceria: Synthesis and Characterization

2007 ◽  
Vol 121-123 ◽  
pp. 97-100
Author(s):  
D. Yang ◽  
Ming Fen Wen ◽  
Ch.L. Song ◽  
Jian Chen ◽  
Yong Wan Gu
Keyword(s):  
Particle Size ◽  
Pore Structure ◽  
Average Particle Size ◽  
High Thermal Stability ◽  
Bet Surface Area ◽  
Synthesis And Characterization ◽  
Hexadecyltrimethylammonium Bromide ◽  
Average Particle ◽  
Mesoporous Ceo2 ◽  
20 Nm

Herein mesoporous CeO2 with high thermal stability was synthesized via a new hydroxycarbonates based hydrothermal threatment approach in present of hexadecyltrimethylammonium bromide (CTAB). IR and XRD prove the coexistence of hydroxycarbonate cerium and CTAB in precursors. TEM micrographs show that non-ordered pore structure is formed in the product, and average particle size of 20 nm is obtained even after calcined at 1173 K. BET results exhibit that the pore structure is stable when the calcination temperature is below 923 K. However, While calcinated at 1173 K, the average particle size is 20 nm, the BET surface area and pore volume can remain as high as 31.07 m2/g and 0.21 cm3 g-1.

Preparation of Monodispersed and Nano-Sized Spherical SiO2 Particles by Emulsion Method

2004 ◽  
Vol 449-452 ◽  
pp. 1161-1164 ◽  
Author(s):  
Jong Hwa Baek ◽  
Young Soo Kang ◽  
Seog Young Yoon ◽  
Hong Chae Park
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Mixing Time ◽  
Average Particle Size ◽  
Average Particle ◽  
Amorphous Sio2 ◽  
Emulsion Method ◽  
Sio2 Particles ◽  
20 Nm

Spherical nano-sized SiO2 particles have been synthesized from sodium silicate by emulsion method. The influence of emulsifier content and mixing time on the morphology and particle size distribution of the resulting materials was investigated. The characteristics of the obtained SiO2 particles were examined by means of XRD, SEM, TEM, and PSA. The monodispersed shperical SiO2 with the average particle size 20 nm was obtained at a emulsifer content of 3vol% and mixing time of 60 min using ultrasonic disruptor. After calcining at 1200oC for 2 hrs, the amorphous SiO2 transformed wholly to the crystalline cristobalite. As increase in emulsifier content from 1 to 3 vol% did not nearly influence on the morphology of SiO2 particle but slightly changed the particle size distribution. The average particle size of SiO2 decreased significantly from 100 nm to 20 nm with increasing the mixing time.

The Photocatalytic Degradation of Methomyl over TiO2 Nanopowder Prepared by the Low Temperature Solvothermal Route

2014 ◽  
Vol 804 ◽  
pp. 209-212 ◽  
Author(s):  
Pusit Pookmanee ◽  
Isara Phiwchai ◽  
Sorachon Yoriya ◽  
Ratchadaporn Puntharod ◽  
Supaporn Sangsrichan ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Photocatalytic Degradation ◽  
High Performance ◽  
Average Particle Size ◽  
Ammonium Hydroxide ◽  
Average Particle ◽  
Mixed Solution ◽  
Liquid Chromatograph ◽  
Solvothermal Route

Titanium dioxide (TiO2) nanopowder was prepared by the low temperature solvothermal route with starting chemicals containing titanium isopropoxide, ammonium hydroxide, nitric acid and ethanol in a PTFE–lined autoclave. The final pH of the mixed solution was 1 and treated at 100 °C for 2–6 h. The white precipitated was filtered and dried in an oven at 80 °C for 24 h. The phase transition was characterized by X–ray diffractometer (XRD). Single phase anatase structure was obtained without calcination step. The morphology and particle size of TiO2nanopowder was investigated by scanning electron microscope (SEM). The average of TiO2nanopowder size was 80–120 nm. The average particle size increased with temperature and time increased. The photocatalytic degradation of methomyl in natural water was studied by high performance liquid chromatograph (HPLC). The percentage of methomyl was decreased in the presence of 34, 23 and 24 over TiO2nanopowder prepared by the low temperature solvothermal route at 100 °C for 2, 4 and 6 h, respectively.

Fabrication of Nano-Sized Tin Oxide Powder by Spray Pyrolysis Process

2009 ◽  
Vol 1174 ◽  
Author(s):  
Jaekeun Yu ◽  
Jwayeon Kim ◽  
Jeoungsu Han
Keyword(s):  
Particle Size ◽  
Spray Pyrolysis ◽  
Reaction Temperature ◽  
Tin Oxide ◽  
Average Particle Size ◽  
Raw Material ◽  
Nano Particles ◽  
Average Particle ◽  
Average Size ◽  
20 Nm

AbstractBy using tin chloride solution as the raw material, a nano-sized tin oxide powder with average particle size below 50 nm is generated by spray pyrolysis reaction. This study also examines the influences of the reaction parameters such as reaction temperature and the concentration of raw material solution on the powder properties. As the reaction temperature increases from 800 to 850 ℃, the average particle size of the generated powder increases from 20 nm to 30 nm. As the reaction temperature reaches 900 ℃, the droplets are composed of nano-particles with average size of 30 nm, while the average size of individual particles increases remarkably up to 80˜100 nm. When the tin concentration reaches 75 g/L, the average particle size of the powder is below 20 nm. When the tin concentration reaches 150 g/L, the droplets are composed of nano particles with average size around 30 nm, whereas the average size of independent particles increases up to 80˜100 nm. When the concentration reaches 400 g/L, the droplets are composed of nano-particles with average size of 30 nm.

scholarly journals Tunable heat generation in nickel-substituted zinc ferrite nanoparticles for effective magnetic hyperthermia

2021 ◽  
Author(s):  
Ralandinliu Kahmei ◽  
Papori Seal ◽  
Jyoti Prasad Borah
Keyword(s):  
Particle Size ◽  
Applied Field ◽  
High Performance ◽  
Cetyltrimethylammonium Bromide ◽  
Zinc Ferrite ◽  
Magnetic Nanoparticle ◽  
Average Particle Size ◽  
Magnetic Hyperthermia ◽  
Ferrite Nanoparticles ◽  
Average Particle

We report a high performance magnetic nanoparticle as hyperthermic agent under low applied field and frequency. CTAB (cetyltrimethylammonium bromide)-coated NixZn1-xFe2O4 nanoparticles of average particle size < 25 nm with various...

Ultrahigh yield synthesis of mesoporous carbon nanoparticles as a superior lubricant additive for polyethylene glycol

2020 ◽  
Vol 49 (16) ◽  
pp. 5283-5290 ◽  
Author(s):  
Zihao Mou ◽  
Baogang Wang ◽  
Zhiyu Huang ◽  
Hongsheng Lu
Keyword(s):  
Particle Size ◽  
Polyethylene Glycol ◽  
Pore Size ◽  
Carbon Nanoparticles ◽  
Mesoporous Carbon ◽  
High Performance ◽  
Average Particle Size ◽  
Lubricant Additive ◽  
Average Particle

Mesoporous carbon nanoparticles (MCNPs) with an average particle size of 27.3 nm and a pore size of 3–5 nm were facilely synthesized in ultrahigh yield (91.7 wt%) and used as a high-performance lubricant additive for polyethylene glycol (PEG200).

Synthesis of Nanophase TiO2 by Ion Beam Sputtering and Cold Condensation Technique

1998 ◽  
Vol 12 (25) ◽  
pp. 2635-2647 ◽  
Author(s):  
L. V. Saraf ◽  
S. I. Patil ◽  
S. B. Ogale ◽  
S. R. Sainkar ◽  
S. T. Kshirsager
Keyword(s):  
Particle Size ◽  
Ion Beam ◽  
Average Particle Size ◽  
Average Particle ◽  
Ion Beam Sputtering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Beam Sputtering ◽  
Cold Condensation ◽  
20 Nm

Nanoparticles of TiO 2 have been synthesized by an ion beam sputtering-cold condensation (IBS-CC) technique. A sintered TiO 2 was sputtered by an ion beam (Kaufman source, 900 eV, Ar+ ions) and the ejected atoms/radicals were made to condense on a Si(l00) substrate held at -50°C. X-ray diffraction data showed that the average particle size in the as-deposited material is about 3.5 ± 1.5 nm. Upon annealing at 600°C for five hours, the average particle size was seen to increase to about 70 ± 10 nm. Further annealing for one hour at 900°C led to increase of average particle size to 200 ± 20 nm. X-ray spectroscopy, Raman spectroscopy and photoluminescence data have been used to reveal the presence and relative concentrations of rutile and anatase phases of TiO 2 in the as-deposited and annealed samples. The IBS-CC method is found to yield a more compact particle size distribution as compared to the method based on Laser Ablation.

Determination of grinding parameters of fenugreek seed

1970 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
S Balasubramanian ◽  
Rajkumar Rajkumar ◽  
K K Singh
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Moisture Content ◽  
Specific Energy ◽  
Feed Rate ◽  
Average Particle Size ◽  
Specific Energy Consumption ◽  
Average Particle ◽  
Fenugreek Seeds ◽  
Fenugreek Seed

Experiment to identify ambient grinding conditions and energy consumed was conducted for fenugreek. Fenugreek seeds at three moisture content (5.1%, 11.5% and 17.3%, d.b.) were ground using a micro pulverizer hammer mill with different grinding screen openings (0.5, 1.0 and 1.5 mm) and feed rate (8, 16 and 24 kg h-1) at 3000 rpm. Physical properties of fenugreek seeds were also determined. Specific energy consumptions were found to decrease from 204.67 to 23.09 kJ kg-1 for increasing levels of feed rate and grinder screen openings. On the other hand specific energy consumption increased with increasing moisture content. The highest specific energy consumption was recorded for 17.3% moisture content and 8 kg h-1 feed rate with 0.5 mm screen opening. Average particle size decreased from 1.06 to 0.39 mm with increase of moisture content and grinder screen opening. It has been observed that the average particle size was minimum at 0.5 mm screen opening and 8 kg h-1 feed rate at lower moisture content. Bond’s work index and Kick’s constant were found to increase from 8.97 to 950.92 kWh kg-1 and 0.932 to 78.851 kWh kg-1 with the increase of moisture content, feed rate and grinder screen opening, respectively. Size reduction ratio and grinding effectiveness of fenugreek seed were found to decrease from 4.11 to 1.61 and 0.0118 to 0.0018 with the increase of moisture content, feed rate and grinder screen opening, respectively. The loose and compact bulk densities varied from 219.2 to 719.4 kg m-3 and 137.3 to 736.2 kg m-3, respectively.  

Formulating SLN and NLC as Innovative Drug Delivery Systems for Non-Invasive Routes of Drug Administration

2020 ◽  
Vol 27 (22) ◽  
pp. 3623-3656 ◽  
Author(s):  
Bruno Fonseca-Santos ◽  
Patrícia Bento Silva ◽  
Roberta Balansin Rigon ◽  
Mariana Rillo Sato ◽  
Marlus Chorilli
Keyword(s):  
Drug Delivery ◽  
Particle Size ◽  
Drug Release ◽  
Drug Loading ◽  
Average Particle Size ◽  
Delivery Systems ◽  
Average Particle ◽  
Minor Importance ◽  
Routes Of Administration ◽  
Non Invasive

Colloidal carriers diverge depending on their composition, ability to incorporate drugs and applicability, but the common feature is the small average particle size. Among the carriers with the potential nanostructured drug delivery application there are SLN and NLC. These nanostructured systems consist of complex lipids and highly purified mixtures of glycerides having varying particle size. Also, these systems have shown physical stability, protection capacity of unstable drugs, release control ability, excellent tolerability, possibility of vectorization, and no reported production problems related to large-scale. Several production procedures can be applied to achieve high association efficiency between the bioactive and the carrier, depending on the physicochemical properties of both, as well as on the production procedure applied. The whole set of unique advantages such as enhanced drug loading capacity, prevention of drug expulsion, leads to more flexibility for modulation of drug release and makes Lipid-based nanocarriers (LNCs) versatile delivery system for various routes of administration. The route of administration has a significant impact on the therapeutic outcome of a drug. Thus, the non-invasive routes, which were of minor importance as parts of drug delivery in the past, have assumed added importance drugs, proteins, peptides and biopharmaceuticals drug delivery and these include nasal, buccal, vaginal and transdermal routes. The objective of this paper is to present the state of the art concerning the application of the lipid nanocarriers designated for non-invasive routes of administration. In this manner, this review presents an innovative technological platform to develop nanostructured delivery systems with great versatility of application in non-invasive routes of administration and targeting drug release.

Azithromycin nanosuspension preparation using evaporative precipitation into aqueous solution (EPAS) method and its comparative dissolution study

2020 ◽  
Vol 17 ◽  
Author(s):  
Mohammad Hossain Shariare ◽  
Tonmoy Kumar Mondal ◽  
Hani Alothaid ◽  
Md. Didaruzzaman Sohel ◽  
MD Wadud ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Dissolution Rate ◽  
Average Particle Size ◽  
Scale Up ◽  
Average Particle ◽  
Total Drug ◽  
Residual Solvent ◽  
Dissolution Study ◽  
Drug Content

Aim: EPAS (evaporative precipitation into aqueous solution) was used in the current studies to prepare azithromycin nanosuspensions and investigate the physicochemical characteristics for the nanosuspension batches with the aim of enhancing the dissolution rate of the nanopreparation to improve bioavailability. Methods: EPAS method used in this study for preparing azithromycin nanosuspension was achieved through developing an in-house instrumentation method. Particle size distribution was measured using Zetasizer Nano S without sample dilution. Dissolved azithromycin nanosuspensions were also compared with raw azithromycin powder and commercially available products. Total drug content of nanosuspension batches were measured using an Ultra-Performance Liquid Chromatography (UPLC) system with Photodiode Array (PDA) detector while residual solvent was measured using gas chromatography (GC). Results: The average particle size of azithromycin nanosuspension was 447.2 nm and total drug content was measured to be 97.81% upon recovery. Dissolution study data showed significant increase in dissolution rate for nanosuspension batch when compared to raw azithromycin and commercial version (microsuspension). The residual solvent found for azithromycin nanosuspension is 0.000098023 mg/ mL or 98.023 ppb. Conclusion: EPAS was successfully used to prepare azithromycin nanoparticles that exhibited significantly enhanced dissolution rate. Further studies are required to scale up the process and determine long term stability of the nanoparticles.

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