Surface Modification of Amorphous Calcium Phosphates by Stearic Acid and Their Stability

Stearic acid was utilized to modify biphasic alpha-tricalcium phosphate (α-TCP)/hydroxyapatite (HA) powders in the ethanol. The results showed that the dispersion of biphasic α-TCP/HA powders (BCPs) in non-polar matrix improved. And the released content of Ca2+ and PO4 3- of the BCPs soaked in the NaAc-HAc buffer solution (pH 5.0) was almost same as that before modification. Stearic acid could modify the suface properties of BCPs and would not obviously affect their biological characteristics, which affords a good groundwork of application of calcium phosphates powders.

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Surface Modification of Nano-Al2O3 with Stearic Acid

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.703.246 ◽

2016 ◽

Vol 703 ◽

pp. 246-250

Author(s):

Min Hong Xu ◽

Jian Li Ma ◽

Meng Xia Qian ◽

Li Hua Jiang

Keyword(s):

Surface Modification ◽

Stearic Acid ◽

Influence Factors ◽

Optimal Conditions ◽

Modification Effect ◽

Before And After

Surface modification of nanoAl2O3 with stearic acid by dry method was researched. The structures of nanoAl2O3 before and after modified were characterized by IR. The modification effect on nanoAl2O3 was measured with the activation index. In addition, the influence factors of modifier dosage, modification time and modification temperature were also discussed. The results showed that nanoAl2O3 had been successfully modified with stearic acid. The hydrophily and lipophilicity experiments indicated that modified nanoAl2O3 possessed lipophilicity property and could disperse in xylene. The optimal conditions of modification were as follows: the stearic acid was 7.5 wt%, based on the quality of nanoAl2O3, modification time was 50 min and temperature was 150 ○C.

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Surface Modification of β-TCP with Stearic Acid and Its Effects on β-TCP/PLLA Biodegradable Composite Nanofibers

Journal of Bone Reports & Recommendations ◽

10.4172/2469-6684.100020 ◽

2016 ◽

Vol 02 (01) ◽

Author(s):

Fengcang Ma ◽

Ping Liu

Keyword(s):

Surface Modification ◽

Stearic Acid ◽

Composite Nanofibers ◽

Biodegradable Composite

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Surface Modification of Nano-Hydroxyapatite by Coating Stearic Acid

10.47277/aanbt/1(1)4 ◽

2020 ◽

Vol 1 (1) ◽

pp. 1-4

Keyword(s):

Surface Modification ◽

Stearic Acid ◽

Polymeric Matrix ◽

Gravimetric Analysis ◽

Polymeric Nanocomposites ◽

Ceramic Particles ◽

X Ray ◽

Hydrophobic Polymers ◽

Modification Method ◽

Ceramic Reinforcement

Todays, researchers are challenging with manufacturing polymeric nanocomposites reinforced with ceramic particles due to two inherent properties of ceramic reinforcement particles, particle agglomeration and incompatibility between hydrophilic ceramic particles and hydrophobic polymeric matrix. So in this study, we used nano-Hydroxyapatite (n-HA) as ceramic material and Stearic acid as amphiphilic material for coating n-HA, hydroxysteric acid (SA) surfactant was used for surface coating particles between the hydrophilic HA powders and the hydrophobic polymers. The surface modification and effect of this method were evaluated by by Fourier transformation infrared (FTIR), x-ray diffractometer (XRD), thermal gravimetric analysis (TGA) and Scanning electron microscopy (SEM). The result of FTIR showed that n-HA surfaces were modified successfully and the modification method had the proper grafting amount according to TGA due to this method of modification will be proper for coating reinforcement particles in polymeric matrix.

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Chemical surface modification of calcium carbonate particles with stearic acid using different treating methods

Applied Surface Science ◽

10.1016/j.apsusc.2016.03.205 ◽

2016 ◽

Vol 378 ◽

pp. 320-329 ◽

Cited By ~ 39

Author(s):

Zhi Cao ◽

Michael Daly ◽

Lopez Clémence ◽

Luke M. Geever ◽

Ian Major ◽

...

Keyword(s):

Surface Modification ◽

Calcium Carbonate ◽

Stearic Acid ◽

Chemical Surface ◽

Chemical Surface Modification

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Surface modification of natural fibrous brucite with stearic acid

Journal of Wuhan University of Technology-Mater Sci Ed ◽

10.1007/s11595-016-1338-3 ◽

2016 ◽

Vol 31 (1) ◽

pp. 108-112 ◽

Cited By ~ 3

Author(s):

Xi Cao ◽

Xiuyun Chuan ◽

Shuhui Zhou ◽

Dubin Huang

Keyword(s):

Surface Modification ◽

Stearic Acid

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Hydrophobic Modification of Magnesium Hydroxide Coating Deposited Cathodically on Magnesium Alloy and its Corrosion Protection

Coatings ◽

10.3390/coatings9080477 ◽

2019 ◽

Vol 9 (8) ◽

pp. 477 ◽

Cited By ~ 3

Author(s):

Yongjun Zhang ◽

Hui Cao ◽

Hanxiong Huang ◽

Zhiping Wang

Keyword(s):

Surface Modification ◽

Stearic Acid ◽

Magnesium Hydroxide ◽

Electrochemical Impedance ◽

Mg Alloy ◽

Hydrophobic Modification ◽

Cathodic Deposition ◽

Composite Surface ◽

Static Contact ◽

Short Period

In this paper, hydrophobic modification of magnesium hydroxide film prepared by cathodic deposition on ME20M Mg alloy was achieved with ethanol solution of stearic acid. The effects of solution concentration, temperature and treatment time on the surface wettability were investigated. The corrosion behaviors of typical samples were evaluated by droplet test, total immersion corrosion test as well as PDP (Potentiodynamic Polarization) and EIS (Electrochemical Impedance Spectroscopy) techniques, respectively. Adhesion of coatings to the substrate were examined by tape test. The surface morphology and chemical composition of typical coatings were characterized by SEM, FTIR and XRD respectively. The results indicate that the superhydrophobic surface with 151.5° water static contact angle and 1° sliding angle could be fabricated successfully by simple immersion in a low-concentration stearic acid solution for a short period. Compared with blank sample, the composite surface modification based on cathodic deposition (CD) plus hydrophobic treatment (HT) extended the discoloration time in droplet tests by nearly 25 fold, decreased the icorr (corrosion current density) by three orders of magnitude, and increased the characteristic impedance modulus at 0.1 Hz by nearly four orders of magnitude, indicating that the CD/HT composite surface modification could enhance the corrosion resistance of Mg alloy significantly.

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