Study of Acoustical and Thermodynamical Properties of Aqueous Ammonium Dihydrogen Orthophosphate

2019 ◽  
Vol 8 ◽  
pp. 379-385
Author(s):  
I. Arockia Mary ◽  
A. Inigo Mary Rita ◽  
K. Maria Eugenie Pia
Keyword(s):  
Thermodynamical Properties ◽  
Ammonium Dihydrogen Orthophosphate ◽  
Dihydrogen Orthophosphate

scholarly journals Mechanical Properties of Differently Nanostructured and High-Pressure Compressed Hydroxyapatite-Based Materials for Bone Tissue Regeneration

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1390
Author(s):  
Vijay H. Ingole ◽  
Shubham S. Ghule ◽  
Tomaž Vuherer ◽  
Vanja Kokol ◽  
Anil V. Ghule
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Pressure ◽  
Bone Regeneration ◽  
Calcium Hydroxide ◽  
Human Bone ◽  
Bone Tissue Regeneration ◽  
Sonochemical Method ◽  
Ammonium Dihydrogen Orthophosphate ◽  
Dihydrogen Orthophosphate

Hydroxyapatite (HAp) has long been considered the gold standard in the biomedical field, considering its composition and close resemblance to human bone. However, the brittle nature of hydroxyapatite (HAp) biomaterial, constrained by its low fracture toughness (of up to 1.2 vs. 2–12 MPa m1/2 of human bone), remains one of the significant factors impairing its use in bone regeneration. In the present study, HAp nanoparticles synthesized by the solid-state (SHAp) and sonochemical (EHAp) approaches using eggshell-derived calcium hydroxide and ammonium dihydrogen orthophosphate as precursors are compared with those synthesized using commercially available calcium hydroxide and ammonium dihydrogen orthophosphate as precursors (CHAp) employing sonochemical method. The HAp samples were then compressed into compact materials using a uniaxial high-pressure compression technique at a preoptimized load and subsequently characterized for mechanical properties using the Vickers indentation method and compressive strength testing. The analysis revealed that the material with smaller particle size (30–40 nm) and crystalline nature (EHAp and CHAp) resulted in mechanically robust materials (σm = 54.53 MPa and 47.72 MPa) with high elastic modulus (E = 4011.1 MPa and 2750.25 MPa) and density/hardness-dependent fracture toughness (σf = 4.34 MPa m1/2and 6.57 MPa m1/2) than SHAp (σm =28.40 MPa, E = 2116.75 MPa, σf = 5.39 MPa m1/2). The CHAp material was found to be the most suitable for applications in bone regeneration.

scholarly journals Mechanical Properties and Cytotoxicity of Differently Structured Nanocellulose-hydroxyapatite Based Composites for Bone Regeneration Application

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 25 ◽  
Author(s):  
Vijay H. Ingole ◽  
Tomaž Vuherer ◽  
Uroš Maver ◽  
Aruna Vinchurkar ◽  
Anil V. Ghule ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanofibrils ◽  
Bone Tissue Regeneration ◽  
Morphological Properties ◽  
Osteoblast Cells ◽  
Indentation Method ◽  
Composition Ratios ◽  
Ammonium Dihydrogen Orthophosphate ◽  
Dihydrogen Orthophosphate

The nanocomposites were prepared by synthesizing (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized cellulose nanofibrils (TCNFs) or cellulose nanocrystals (CNCs) with hydroxyapatite (HA) in varying composition ratios in situ. These nanocomposites were first obtained from eggshell-derived calcium and phosphate of ammonium dihydrogen orthophosphate as precursors at a stoichiometric Ca/P ratio of 1.67 with ultrasonication and compressed further by a uniaxial high-pressure technique. Different spectroscopic, microscopic, and thermogravimetric analyses were used to evaluate their structural, crystalline, and morphological properties, while their mechanical properties were assessed by an indentation method. The contents of TCNF and CNC were shown to render the formation of the HA crystallites and thus influenced strongly on the composite nanostructure and further on the mechanical properties. In this sense, the TCNF-based composites with relatively higher contents (30 and 40 wt %) of semicrystalline and flexible TCNFs resulted in smoother and more uniformly distributed HA particles with good interconnectivity, a hardness range of 550–640 MPa, a compression strength range of 110–180 MPa, an elastic modulus of ~5 GPa, and a fracture toughness value of ~6 MPa1/2 in the range of that of cortical bone. Furthermore, all the composites did not induce cytotoxicity to human bone-derived osteoblast cells but rather improved their viability, making them promising for bone tissue regeneration in load-bearing applications.

Indian Ocean Rim Association

2020 ◽  
pp. 169-194
Author(s):  
Jasdeep Kaur Dhami ◽  
Manbir Singh
Keyword(s):  
Indian Ocean ◽  
Palm Oil ◽  
Synthetic Fibers ◽  
Investment Promotion ◽  
Knit Fabrics ◽  
Animal Hair ◽  
Trade Potential ◽  
The Indian Ocean ◽  
Ammonium Dihydrogen Orthophosphate ◽  
Dihydrogen Orthophosphate

The Indian Ocean Rim Association (IORA) is a regional forum that focuses on bringing together representatives of government, business, and academia, for promotion purposes. It depends on the principles of open regionalism for strengthening trade facilitation and investment, promotion, and social development of the region. Social, cultural, political, geographical, and economic linkages exist between 22 member nations. The main objective of this chapter is analyzing India's trade potential with IORA member nations. The main outcome of this chapter is that India should concentrate on ammonium dihydrogen orthophosphate for Australia, gold and semi-manufactured for Singapore, mineral or chemical fertilizers for Thailand, tankers for Malaysia, warp knit fabrics of synthetic fibers for Indonesia, ammonium dihydrogen orthophosphate for South Africa, palm oil and fractions for Sri Lanka, Bangladesh, Mozambique, Tanzania, the United Republic of Yemen, crude palm oil for Kenya, bigeye tunas, frozen for Mauritius, and carded yarn of fine animal hair for Madagascar.

scholarly journals Determination of Magnesium Valproate and Its Process Related Impurities by Ultraperformance Liquid Chromatography

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Rakshit Thakkar ◽  
Hitesh Saravaia ◽  
Madhavi Patel ◽  
Anamik Shah
Keyword(s):  
Mobile Phase ◽  
Reversed Phase ◽  
Isocratic Elution ◽  
Related Impurities ◽  
System Suitability ◽  
Liquid Chromatographic ◽  
Ammonium Dihydrogen Orthophosphate ◽  
Dihydrogen Orthophosphate

A selective ultraperformance liquid chromatographic (UPLC) method for the determination of magnesium valproate and its process related impurities has been developed. The method includes reversed-phase Acquity BEH C18 column with 100 mm × 2.1 mm i.d. and 1.7 µ particle size. The mobile phase consists of acetonitrile and 5 mM ammonium dihydrogen orthophosphate with pH = 3.0 at 45 : 55 isocratic elution. The flow rate was set at 0.3 mL/min and UV detection was performed at 215 nm. A system suitability test (SST) was developed to govern the quality of the separation. The developed method has been validated further with respect to linearity, accuracy, precision, selectivity, LOD, LOQ, and robustness. Different batches of samples were examined using this method; the method proved to be successful when applied to analyze a marketed magnesium valproate formulation.

Sign in / Sign up

Export Citation Format

Share Document