Thi Kim Oanh Vuong

Bio: Thi Kim Oanh Vuong is an academic researcher from Vietnam Academy of Science and Technology. The author has contributed to research in topics: Ferrofluid & Magnetization. The author has an hindex of 3, co-authored 4 publications receiving 46 citations.

Fabrication and activity evaluation on Asparagus officinalis of hydroxyapatite based multimicronutrient nano systems

Abstract: Nowadays, the raising in agriculture productions is required to meet the demand for growing population. Besides macronutrients (nitrogen, phosphorus and potassium, and to a lesser degree, calcium, sulfur and magnesium) requirements, plants need micronutrients (copper, iron, zinc, boron...) to ensure productivity as well as high agricultural quality. The activity of these elements is greatly affected by very small changes in environmental factors such as pH, mechanical composition and organic matter in the soil. Therefore, there must be another way to effectively bring these elements to the crop. This leads to research and development of a new fertilizer to provide nutrients more effectively. This study reports the synthesis of a new nanofertilizer incorporating micronutrients with hydroxyapatite (nHA) and its impacts on Asparagus officinalis germination. FESEM images show that the nanofertilizer particles were in rod-shaped with diameters of 20–25 nm and length of approximately 86 nm, while EDX image reveals micronutrient compositions: Ag (696 mg kg−1), Zn (619 mg kg−1), Cu (427 mg kg−1), Co (519 mg kg−1g) and Fe (751 mg kg−1). The 10-day-long Asparagus officinalis seeds test proved a faster germination rate (46.4 ± 1.2 mm/10 days) compared to that of normal treatment (35.3 ± 0.8 mm/10 days). When asparagus was used the micronutrients nano system, they had the ability to grow faster than unused. These results suggest promising application of nanoferitilizer in agriculture.

Magnetite (Fe3O4) Nanoparticles in Biomedical Application: From Synthesis to Surface Functionalisation

Abstract: Nanotechnology has gained much attention for its potential application in medical science. Iron oxide nanoparticles have demonstrated a promising effect in various biomedical applications. In particular, magnetite (Fe3O4) nanoparticles are widely applied due to their biocompatibility, high magnetic susceptibility, chemical stability, innocuousness, high saturation magnetisation, and inexpensiveness. Magnetite (Fe3O4) exhibits superparamagnetism as its size shrinks in the single-domain region to around 20 nm, which is an essential property for use in biomedical applications. In this review, the application of magnetite nanoparticles (MNPs) in the biomedical field based on different synthesis approaches and various surface functionalisation materials was discussed. Firstly, a brief introduction on the MNP properties, such as physical, thermal, magnetic, and optical properties, is provided. Considering that the surface chemistry of MNPs plays an important role in the practical implementation of in vitro and in vivo applications, this review then focuses on several predominant synthesis methods and variations in the synthesis parameters of MNPs. The encapsulation of MNPs with organic and inorganic materials is also discussed. Finally, the most common in vivo and in vitro applications in the biomedical world are elucidated. This review aims to deliver concise information to new researchers in this field, guide them in selecting appropriate synthesis techniques for MNPs, and to enhance the surface chemistry of MNPs for their interests.

Solid matrices for fabrication of magnetic iron oxide nanocomposites: Synthesis, properties, and application for the adsorption of heavy metal ions and dyes

Abstract: A massive release of harmful substances especially heavy metal ions and dyes to the environment has been a major concern due to many people disregards the proper protocols in the waste management. The freshwater supplies are threatened and huge discharge of pollutants result from various anthropogenic activities may pose a major threat to the living organisms and negatively affect the ecosystem stability. This article reviews the development of magnetic iron oxide nanocomposites for removal of heavy metal ions and dyes from water. The highlight will be focused on current research activities for controlled size and dispersion of magnetic iron oxide nanoparticles within solid matrices including zeolites, silica, clays, carbon, activated carbon, graphene and graphene oxide. The magnetic properties of the nanocomposites will be evaluated to determine whether they possessed sufficient magnetization for easy separation by an external magnet. The unique features of the synthesized materials will be investigated along with their application in the removal of heavy metal ions and dyes. The advantages and limitations of the magnetic nanocomposites will be highlighted to determine their adsorption ability. The effect of various parameters such as pH, contaminants concentration, adsorbent dosage, contact time and temperature will be summarized to identify the best condition for effective pollutants removal.

Engineering Biomimetic Calcium Phosphate Nanoparticles: A Green Synthesis of Slow-Release Multinutrient (NPK) Nanofertilizers

Abstract: Biomimetic calcium phosphate nanoparticles (CaP) have been actively used in biomedicine, due to their high biodegradability and biocompatibility. However, much less progress has been made regarding...