Development and Characterization of β- Tricalcium Phosphate Cements Containing Chitosan

2006 ◽  
Vol 309-311 ◽  
pp. 845-848 ◽  
Author(s):  
Marina S. Tonoli ◽  
Claudinete V. Leal ◽  
Cecília A.C. Zavaglia ◽  
Marisa Masumi Beppu
Keyword(s):  
Acetic Acid ◽  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Chitosan Solution ◽  
Phosphoric Acid Solution ◽  
Mechanical Resistance ◽  
Total Acid

Cements were prepared by mixing the calcium phosphate (β-TCP) with phosphoric acid solution (2.6M) and chitosan solution (2.5% in acetic acid solution) that was added in different proportions, ranging from 1 to 50% of total acid solution amount. Observations using SEM showed that the used of chitosan increased the interconnectivity of grains in the final cement, although the mechanical resistance to compression decreased from approximately 3 to 1 MPa. Probably the chitosan macromolecule is able to form a more interconnected net.

Effect of acetic acid on wet patterning of copper/molybdenum thin films in phosphoric acid solution

2011 ◽  
Vol 519 (20) ◽  
pp. 6806-6809 ◽  
Author(s):  
Bo.-Hyun Seo ◽  
Sang-Hyuk Lee ◽  
In-Sun Park ◽  
Jong Hyun Seo ◽  
HeeHwan Choe ◽  
...  
Keyword(s):  
Thin Films ◽  
Acetic Acid ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Phosphoric Acid Solution

Physicochemical Characterization of Nano-Hydroxyapatite Prepared by a Wet Method

2017 ◽  
Vol 758 ◽  
pp. 189-193
Author(s):  
Jia Yun Xu ◽  
Shohei Kasugai ◽  
Hideki Aoki ◽  
Takayuki Terukina ◽  
Makoto Otsuka
Keyword(s):  
Body Temperature ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Physicochemical Properties ◽  
Calcium Hydroxide ◽  
Physicochemical Characterization ◽  
Phosphoric Acid Solution ◽  
Reaction Conditions ◽  
Lower Temperature

Recently nano-hydroxyapatite (nano-HA) has been used as a new biomaterial in medical and dental fields. There are many methods to synthesize the nano-HA. In the present study, the nano-HA was synthesized under various reaction conditions by a wet method using neutralization reaction of calcium hydroxide suspension and phosphoric acid solution. The physicochemical properties of the nano-HA were characterized by XRD, FTIR, TG and TEM. The XRD, FTIR and TEM results indicated that the nano-HA samples were pure and the sizes were less than 50 nm. However, all samples contained carbonate and the contents were determined to be 2-4% by TG. The crystallinity of the nano-HA increased higher at body temperature of 37°C than at lower temperature of 7-10°C.

Electrospinning and Characterization of Novel Opuntia ficus-indica Mucilage Biomembrane

2012 ◽  
Vol 1480 ◽  
Author(s):  
Sylvia W. Thomas ◽  
Norma A. Alcantar ◽  
Yanay Pais
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Volume Ratio ◽  
Average Diameter ◽  
Low Molecular Weight ◽  
Opuntia Ficus Indica ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTOpuntia ficus-indica (Ofi) cactus non-gelling (NE) mucilage nanofibers were electrospun with acetic acid solution and polyvinyl alcohol (PVA) as a polymer. The best fiber coverage was achieved with an aqueous 50% acetic acid solution and 9% low molecular weight PVA at a 70:30 PVA:Mucilage volume ratio. Other volume ratios (30:70 and 50:50) produced beads and other deformities. Fibers were formed with an average diameter of 180nm as measured by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Favorable electrospinning conditions were used to fabricate a 1 cm x 1 cm Ofi nanofiber biomembrane. Heat flow (W/g) versus temperature peaks ranged from 214 – 222°C, which is comparable to endothermic peak ranges observed for crystalline PVA. This could possibly further indicate some form of crystallinity within the Ofi nanofiber membrane. The electrospun process used precursors that were biodegradable, non-toxic, and sustainable to optimize the mucilage nanofiber formation, which will help enhance the potential performance of the Ofi nanofiber biomembrane in filtration and sensory systems.

Characterization of Porous Anodic Aluminium Oxide Film on Aluminium Templates Formed in Anodizing Process

2010 ◽  
Vol 173 ◽  
pp. 55-60 ◽  
Author(s):  
A. Wahab Juyana ◽  
Mohd Nazree Derman
Keyword(s):  
Acetic Acid ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Aluminium Oxide ◽  
X Ray Diffraction ◽  
Mixed Acid ◽  
Anodic Aluminium Oxide ◽  
Optimum Parameters ◽  
Xrd Techniques

A porous anodic aluminium oxide (AAO) films were successfully fabricated on aluminium templates by using anodizing technique. The anodizing process was done in the mixed acid solution of phosphoric acid and acetic acid. The growth, morphology and chemical composition of AAO film were investigated. During the anodizing process, the growth of the oxide pores was strictly influenced by the anodizing parameters. The anodizing was done by varying the voltage at 70 V to 130 V and temperature from 5 °C to 25 °C. The electrolyte concentration was remaining constant. In this study, all the samples were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques. From this study, the optimum parameters to obtain porous AAO film with the mixture of phosphoric acid and acetic acid solution can be known.

Some Approaches to Viscometric Study of Chitosan in Acetic Acid Solution

2016 ◽  
Vol 10 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Valentina Chernova ◽  
◽  
Angela Shurshina ◽  
Elena Kulish ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Intrinsic Viscosity ◽  
Acetic Acid Solution ◽  
Conformational State ◽  
Macromolecular Coil ◽  
Degree Of Swelling ◽  
Current Value ◽  
Viscometric Study

Some ways of estimating the values of the intrinsic viscosity of chitosan were analyzed. It was shown that the method of Irzhak and Baranov for estimating the current value of the intrinsic viscosity allows to adequately estimates the conformational state of the macromolecular coil and its degree of swelling.

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