Synthesis of Silver Nanoparticles with Laser Assistance

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Self-assembly of micelles into designed networks

The EO20PO70EO20(molecular weight 5800) amphiphile as a template is to form dispersed micelle structures. Silver nanoparticles, as inorganic precursors synthesized by a laser ablation method in pure water, are able to produce the highly ordered vesicles detected by TEM micrography. The thickness of the outer layer of a micelle, formed by the silver nanoparticles interacting preferentially with the more hydrophilic EO20block, was around 3.5 nm. The vesicular structure ensembled from micelles is due to proceeding to the mixture of cubic and hexagonal phases

Bio-nanotechnology application in wastewater treatment

The nanoparticles have received high interest in the field of medicine and water purification, however, the nanomaterials produced by chemical and physical methods are considered hazardous, expensive, and leave behind harmful substances to the environment. This chapter aimed to focus on green-synthesized nanoparticles and their medical applications. Moreover, the chapter highlighted the applicability of the metallic nanoparticles (MNPs) in the inactivation of microbial cells due to their high surface and small particle size. Modifying nanomaterials produced by green-methods is safe, inexpensive, and easy. Therefore, the control and modification of nanoparticles and their properties were also discussed

Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation

Spherical iron oxide nanocomposite particles composed of magnetite and wustite have been successfully synthesized using a novel method of pulsed laser irradiation in ethyl acetate. Both the size and the composition of nanocomposite particles are controlled by laser irradiation condition. Through tuning the laser fluence, the Fe3O4/FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated. This work presents a successful example of the fabrication of ferro (ferri) (FM)/antiferromagnetic (AFM) systems with high chemical stability. The results show this novel simple method as widely extendable to various FM/AFM nanocomposite systems

Peptic ulcer: does it changed identity?

Aim of investigation. To estimate possible changes of peptic ulcer (PU) epidemiology: gender and age of patients, age at disease onset, ratio of the stomach ulcers (SU) to duodenal ulcers (DU), clinical features at relapse of PU, frequency of concomitant digestive diseases. Material and methods. Overall 79 case records of patients with PUD of the stomach (PUS) (16 men, 33 women), PUD of duodenum (PUD) (15 men, 9 women) and PUD of combined localization (1 man and 5 women) were included in the study by continuous sampling method. Symptom frequency at PUD relapse and accompanying changes was estimated independently for male and female groups. Results. At the present time there is a shift of PUS to PUD ratio towards more common stomach ulcer location, increase in female proportion of PU patients and mean patient age at the onset of disease. Epigastric pain that develop in fasting state or after food intake remains to be the leading symptom of PU relapse and is observed at 87.5% of male and 95.7% of female patients. Significant number of patients present with heartburn and belching, that is explained by high frequency of PU to gastroesophageal reflux disease (GERD) combination (in 93.8% of men and 83.0% of women). Positive test for Helicobacter pylori (H. pylori) infection were received in 94.9% of patients. Idiopathic H. pylori-negative ulcers were detected only in 5.1% of patients. Conclusions. The modern trend in the PU clinical course is characterized by shift of typical male to female ratio, as well as PUD to PUS ratio, the high frequency of PU to GERD combination. Most patients were admitted for relapse of PU were positive for H. pylori infection