scholarly journals Growth, Structural, Optical, Mechanical and Dielectric Characterization of Diammonium Hydrogen Phosphate (DAHP) Single Crystals

2011 ◽  
Vol 10 (15) ◽  
pp. 1379-1389
Author(s):  
P. Selvarajan ◽  
N. Joseph John ◽  
C.K. Mahadevan
Keyword(s):  
Single Crystals ◽  
Hydrogen Phosphate ◽  
Dielectric Characterization ◽  
Diammonium Hydrogen Phosphate ◽  
Diammonium Hydrogen

Preparation and Characterization of Hydroxyapatite Whiskers

2013 ◽  
Vol 389 ◽  
pp. 21-24 ◽  
Author(s):  
Yong Shun Cui ◽  
Ting Ting Yan ◽  
Xiao Pei Wu ◽  
Qing Hua Chen
Keyword(s):  
Nitric Acid ◽  
Calcium Nitrate ◽  
Diameter Ratio ◽  
Homogeneous Precipitation ◽  
Hydrogen Phosphate ◽  
High Crystallinity ◽  
Diammonium Hydrogen Phosphate ◽  
Diammonium Hydrogen

Hydroxyapatite whiskers were prepared with diammonium hydrogen phosphate, calcium nitrate, nitric acid, sorbitol, HAP seed and carbamide by hydrothermal homogeneous precipitation. The HAP seeds served as whiskers nuclei and sorbitol served as template. The prepared hydroxyapatite whiskers were characterized by XRD,SEM and FTIR. It was indicated that hydroxyapatite whiskers with high crystallinity grew alone Z axis with carbonated trend, and the appearance of HAP was smooth, less magazine and no reunion, the length-diameter ratio of the whiskers was in range of 125-8 with the average is 32.78.

Facile Synthesis of Hydroxyapatite Nanorods with Controlled Sizes and Morphologies

2010 ◽  
Vol 148-149 ◽  
pp. 1584-1587
Author(s):  
Sha Sha Lv ◽  
Ning Wang ◽  
Gui Cun Li ◽  
Hong Rui Peng
Keyword(s):  
Hydrothermal Method ◽  
Calcium Chloride ◽  
Hydrogen Phosphate ◽  
Facile Synthesis ◽  
High Quality ◽  
Facile Hydrothermal Method ◽  
Diammonium Hydrogen Phosphate ◽  
Diammonium Hydrogen

High quality hydroxyapatite (HAP) nanorods have been synthesized at 180 °C by a facile hydrothermal method using calcium chloride and diammonium hydrogen phosphate as precursors in the absence of any surfactants. The diameters and lengths of HAP nanorods are in the range of 40-80 nm and 0.2-2.0 μm respectively. The sizes and morphologies of HAP nanorods can be controlled by adjusting the synthetic parameters, such as reaction temperatures, and types of surfactants. A possible mechanism was also proposed to explain the growth of the HAP nanorods.

Proton Conducting Electrolytes Synthesized with Diammonium Hydrogen Phosphate

2009 ◽  
Vol 421-422 ◽  
pp. 471-474 ◽  
Author(s):  
Dedy Eka Priyanto ◽  
Hidenobu Shiroishi ◽  
Satoshi Tanimoto ◽  
Shunsuke Hirukawa ◽  
Morihiro Saito ◽  
...  
Keyword(s):  
Solid State ◽  
Impedance Spectroscopy ◽  
Molar Ratio ◽  
Preparation Process ◽  
Ac Impedance Spectroscopy ◽  
Hydrogen Phosphate ◽  
Proton Conducting ◽  
Diammonium Hydrogen Phosphate ◽  
Diammonium Hydrogen

Proton conducting ZrO2－yP2O5 (y = 1.0, 1.2, 1.4. 1.6, 1.8) electrolytes based on a shell-core structure were synthesized with diammonium hydrogen phosphate by a solid state reaction, and their conductivities were investigated by ac-impedance spectroscopy. Among the ZrO2-yP2O5 compositions, ZrO2－1.6P2O5 showed the highest proton conductivity of 0.13 Scm-1 at 250°C. The conductivity increased with increasing P2O5 molar ratio and were significantly influenced by heat-treatments in the preparation process. Polytetraflouroethylene (PTFE) was also mixed into these electrolytes in order to improve the mechanical strength and long term durability.

Diammonium Hydrogen Phosphate: An Efficient and Versatile Catalyst for the One-Pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives in Aqueous Media.

ChemInform ◽  
2007 ◽  
Vol 38 (41) ◽  
Author(s):  
Saeed Balalaie ◽  
Morteza Bararjanian ◽  
Masoumeh Sheikh-Ahmadi ◽  
Shohreh Hekmat ◽  
Peyman Salehi
Keyword(s):  
Aqueous Media ◽  
Hydrogen Phosphate ◽  
One Pot ◽  
Diammonium Hydrogen Phosphate ◽  
One Pot Synthesis ◽  
The One ◽  
Diammonium Hydrogen

scholarly journals PENGARUH KONDISI KALSINASI PADA SINTESIS SENYAWA HYDROXYAPATITE

2011 ◽  
Vol 2 (1) ◽  
pp. 13-21
Author(s):  
Lisa Utami ◽  
Syukri Arief ◽  
Novesar Jamarun
Keyword(s):  
Hydrogen Phosphate ◽  
Diammonium Hydrogen Phosphate ◽  
Diammonium Hydrogen

Kalsium fosfat telah menjadi perhatian yang menarik dalam bidang medis dan kedokteran karena biocompatibilitynya yang baik dan struktur serta komposisi kimianya yang sama dengan fasa mineral jaringan keras manusia (tulang dan gigi). Penelitian ini difoukuskan untuk mempelajari faktor yang mempengaruhi morfologi dan komposisi fasa dari senyawa hydroxyapatite dengan menggunakan prekusor diammonium hydrogen phosphate sebagai sumber fosfat serta pengaruh kalsinasi pada suhu 200, 400, 600, 800 dan 1000oC. Produk hidroxyapatite yang dihasilkan dikarakterisasi dengan FTIR, XRD, SEM dan TGA. Hidroxyapatite yang dihasilkan dengan variasi suhu kalsinasi mempengaruhi morfologi dan komposisi fasa dari senyawa kalsium fosfat yang dihasilkan. Fasa yang terbentuk sebelum sampel powder fosfat dikalsinasi dengan (NH4)2HPO4 sebagai sumber fosfat adalah Ca2P2O7.2H2O dengan ukuran kristal 67 nm. Ketika sampel powder kalsium fosfat dikalsinasi pada temperatur 600˚C fasa yang terbentuk dengan menggunakan (NH4)2HPO4 sebagai sumber fosfat adalah hydroxiapatite (HAP) dengan ukuran kristal 8,66 nm Dan ketika sampel dikalsinasi pada temperatur 1000˚C fasa yang dihasilkan yaitu Ca2P2O7 dan Ca3(PO4)2.

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