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Here, we present a novel method to control the size of the CuO nanoparticles (NPs) and Cu loading in SBA-15 via fast desorption of supercritical CO2 (scCO2). After calcination, the average size of the CuO nanoparticles (6.47±2.89~2.18±0.97 nm) decreased with the increase of depressurization rate (20-14 MPa, 50 °C) from transmission electron microscopy (TEM), and the x-ray diffraction (XRD) results also indicated the decrement of the average particle size (8.6~4.3 nm by Scherrer equation). Two reduction peaks situated at 195 °C and 220 °C were found from the temperature-programmed reductions (TPR) with H2 profiles, and the intensity of the low-temperature peak increased with increasing the rate for a profile. The hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) was selected to evaluate the catalytic activity of the as-prepared sample. The reaction was conducted at p = 3.0 MPa, T = 200 °C, H2/DMO = 120 and WHSV = 1.2 h-1, and the EG selectivity remained about 90% for over 100 h. The fast desorption of scCO2 caused mechanical perturbations and crystallization of the adsorbed salt ions on the supports, decreasing particle size and increasing Cu loading (8~12 wt.%).
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Green synthesis of nanoparticles is becoming increasingly popular as a simple and environmentally friendly method. In this study, iron-based nanoparticles (Fe-NPs) were successfully prepared using a p...
The present study was conducted to examine the potential mechanisms responsible for the distribution of polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (o-PAHs) in size fracti...
This work reports a massively parallel approach for synthesizing inorganic nanoparticles (Au, Ag, Se, and mixed oxides of Cu, Co, Ni, Ge, and Ta) based upon lithographically generated arrays of square...
Liposomes are spherical vesicles enclosed by phospholipid bilayers. Nanoscale liposomes are widely employed for drug delivery in the pharmaceutical industry. In this study, nanoscale liposomes are fab...
In this study, we describe the synthesis and characterization of silver nanoparticles (Ag-NPs) of different sizes and evaluated their antibacterial activity. Particles size and morphology were charact...
[Development of diagnosis algorism for paroxysmal arrhythmia using ultra-thin resistive membrane: a pilot study] Comparison of blood pressure via tunable crack sensor and invasive pressure...
The design of the study will be randomized, double blind trial, which will examine the effects of Rosiglitazone on the fasting triglycerides (TG), high-density lipoprotein (HDL), HDL parti...
This is the prospective randomized parallel groups trial with two participating centers (Department of Urology, Saint Petersburg State University Clinic of advanced medical technologies n....
This study will evaluate the effect of allograft bone particle size on the bone quantity and quality following socket grafting and lateral ridge augmentation in preparation for endosseous ...
The purpose of this prospective randomized clinical study was to compare implant survival, patient satisfaction, and radiographic, clinical, and aesthetic outcomes following immediate load...
Relating to the size of solids.
Damage to any compartment of the lung caused by physical, chemical, or biological agents which characteristically elicit inflammatory reaction. These inflammatory reactions can either be acute and dominated by NEUTROPHILS, or chronic and dominated by LYMPHOCYTES and MACROPHAGES.
An analytical technique for measuring particle size of molecules that are less than a micron in diameter dispersed or dissolved in a liquid.
The process of intracellular viral multiplication, consisting of the synthesis of PROTEINS; NUCLEIC ACIDS; and sometimes LIPIDS, and their assembly into a new infectious particle.
A diet rich in DIETARY CARBOHYDRATES.
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...