Professor Sadrnezhaad | Sharif University of Technology (original) (raw)

Papers by Professor Sadrnezhaad

Journal of Alloys and Compounds, 2017

Optimum operating parameters for pulse co-deposition of nano-Al 2 O 3 with Cr from a trivalent ch... more Optimum operating parameters for pulse co-deposition of nano-Al 2 O 3 with Cr from a trivalent chromium bath onto Cu cathod are selected by using "technique for order performance by similarity to ideal solution" (TOPSIS), "VIšekriterijumsko KOmpromisno Rangiranje" (VIKOR), "elimination and choice expressing the reality" (ELECTRE) and "complex proportional assessment" (CORPAS) accompanied with analytic hierarchy processing (AHP) to compare methods for achievement of the best tribological coating performance. Criteria for appropriate selection include wear loss, corrosion resistance, microhardness, bath condition and current efficiency. Results ascertain the best Cr-Al 2 O 3 nano-composite coating with 40% duty cycle, 10 Hz current frequency and 1 g/L nano-Al 2 O 3 dispersed into the electrolyte bath. Comparison of the different calculated Speraman's coefficients weighed with the «subjective» analytic hierarchy process indicates more consistent results than «objective» entropy technique. The study clarifies the comparative capability of the weighing and the ranking methods in choosing the best way to make consistent final results independent of the level of knowledge and standpoints of the researchers. Recommendation of subjective rather than objective weighing apparatus to the MCDM researchers is therefore a constructive achievement.

Journal of Alloys and Compounds, 2018

Thermal-sprayed MCrAlY coatings have become widespread in various industries such as power plants... more Thermal-sprayed MCrAlY coatings have become widespread in various industries such as power plants, aeronautics, and oil and gas firms. High-temperature oxidation behavior of these coatings is therefore of significance. Spraying of two prevalent MCrAlY powders (NiCoCrAlY and CoNiCrAlY) on Hastelloy substrate by high velocity oxygen and fuel method and exposing them to 1000 °C air for resolving of their cyclic oxidation behavior are presented in this paper. The coatings were characterized by x-ray diffraction, scanning electron microscopy and energydispersive x-ray spectroscopy. The obtained oxidation kinetic indicated that at 1000 °C, the thermally sprayed NiCoCrAlY coating has greater resistance to oxidation than CoNiCrAlY. While oxidation rate of the former follows a parabolic rate equation with specific rate of 5.1×10-3 (µm) 2 .h-1 at 1000 °C, the oxidation rate for the latter has a specific rate of 12.1×10-3 (µm) 2 .h-1 .

Metallurgical and Materials Transactions B, 2015

Gold nanoparticles (AuNPs) of less than 50 nm diameter were electrodeposited from cyanide solutio... more Gold nanoparticles (AuNPs) of less than 50 nm diameter were electrodeposited from cyanide solution by pulsating electric current on modified copper and indium tin oxide (ITO) films coated on glass. Morphology, size, and composition of the deposited AuNPs were studied by X-ray photoelectron spectroscopy, atomic force microscopy, and field emission scanning electron microscopy. Effects of peak current density, pulse frequency, potassium iodide and cysteine on grain size, and morphology of the AuNPs were determined. Experiments showed that cathode current efficiency increases with the pulse frequency and the iodide ion. Size of the AuNPs increased with the current density. The number of nucleation sites was larger on ITO than on Cu layer; while the average diameter of the crystallites on ITO was smaller than on Cu layer.

Materials and Manufacturing Processes, 2014

Aluminum matrix composites (AMCs) are candidate materials for total joint arthroplasty, dental pr... more Aluminum matrix composites (AMCs) are candidate materials for total joint arthroplasty, dental prostheses, cutting tools, and biomedical gadgets owing to their strength, machinability, dimension accuracy, and wear resistance. A novel method for manufacturing new generation of AMCs by addition of 10Ce-TZP(tetragonal zirconia polycrystal)/Al 2 O 3 nanoparticles to aluminum via powder metallurgy is devised. Aqueous combustion synthesis is used for dispersoid production and milling-compaction-sintering for AMC fabrication. Effects of 10Ce-TZP/Al 2 O 3 content on hardness, erosion, and wear resistance are investigated. Scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and pin-on-disk analyses are used to explore worn interface, morphology, mechanism of abrasion, and resistance to wear. By addition of 7 wt% dispersoid, considerable increase in hardness and resistance to wear are achieved.

Lanthanum hydroxide (La(OH) 3) nanostructures, including elliptical nanoparticles, octahedral rod... more Lanthanum hydroxide (La(OH) 3) nanostructures, including elliptical nanoparticles, octahedral rods and irregular nanoparticles were prepared chemically in NaOH and KOH solutions with 10 M concentration. The obtained powders were characterized with XRD, SEM, TEM and DTA. Crystallinities, morphologies and thermal behavior of the obtained nanostructure powders were investigated under the influence of above mentioned solvents. The effect of chemical's temperature was also determined in one of the solvents (i.e. NaOH). The formation of growth in nanostructure mechanism under the influence of alkali solutions (i.e., KOH and NaOH) have been discussed considerably in this paper.

Journal of Molecular Structure, 2014

ABSTRACT This study proposes a common approach for growing multiwall carbon nanotubes (MWCNTs) on... more ABSTRACT This study proposes a common approach for growing multiwall carbon nanotubes (MWCNTs) on nickel nanodeposits. MWCNT growth was performed in two separate stages. In the first stage, nickel nanodeposits were electrodeposited on n-Si(1 1 1):H substrate in the presence of sulfuric acid. Based on atomic force microscopy (AFM) observations, the nickel deposits had a fairly polygonal morphology and were distributed on the prepared n-Si(1 1 1):H substrate. In the second stage, acetylene gas was decomposed on the surfaces of the nickel nanodeposits using chemical vapor deposition method at 700 °C. When carbon is saturated in a catalyst, it acts as a primary nucleating element for MWCNT growth. The structure of the MWCNTs was also investigated using scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectroscopy. Results showed that the synthesized MWCNTs had a small wall thickness and were formed under the experimental conditions applied to the system.

Materials Letters, 2007

Polypyrrole/multiwall carbon nanotube (PPy/MWCNT) nanocomposites were successfully synthesized by... more Polypyrrole/multiwall carbon nanotube (PPy/MWCNT) nanocomposites were successfully synthesized by electropolymerization of MWCNTdispersed pyrrole solution on the surface of copper electrodes. The obtained nanocomposites were characterized with scanning electron microscopy (SEM), linear sweep voltammetry (LSV) and thermal gravimetric analysis (TGA). Polypyrrole structures which embraced the MWCNTs led to the formation of nanocomposite striated parallel walls. MWCNTs acted as appropriate substrates for electrodeposition of polypyrrole particulate structures and high yield synthesis of PPy was observed on them. Smooth PPy/MWCNT nanocomposite films were obtained on Cu electrodes by decreasing the potential scan rate. Thermogravimetric analysis showed that MWCNTs increased the thermal stability of polypyrrole.

Materials Chemistry and Physics, 2010

Journal of the American Ceramic Society, 2008

Journal of the American Ceramic Society, 2007

Journal of the American Ceramic Society, 2008

Self-assembled dandelion-like hydroxyapatite (HAp) nanostructures were successfully synthesized v... more Self-assembled dandelion-like hydroxyapatite (HAp) nanostructures were successfully synthesized via a mild template-free hydrothermal process, using ethylenediaminetetraacetic acid (EDTA) as the surfactant. The obtained dandelion-like HAp nanostructures were between 5 and 8 lm in diameter and were composed of radially oriented nanorods with an average diameter of about 200 nm. The X-ray diffraction analysis and Fourier transform infrared spectroscopy were used to characterize the crystalline phase and purity of the synthesized nanostructures. The Brunauer-Emmett-Teller surface area of the dandelion-like nanostructures was measured to be about 39 m 2 /g. The results of thermal analysis revealed that dandelion-like HAp nanostructures have appropriate thermal stability up to 12001C. Scanning electron microscopy and transmission electron microscopy analyses showed that EDTA plays an important role in obtaining the dandelion-like morphology, because without it, only monodispersed HAp nanoparticles with an average diameter of about 125 nm were formed. The mechanism for the formation of dandelion-like HAp nanostructures was suggested based on the radial self-assembly of Ca-EDTA molecular complexes. II. Experimental Procedures (1) Sample Preparation Nanostructure HAp was prepared via a hydrothermal synthesis technique. Analytical-grade CaCl 2 (Merck, Darmstadt, Germany), K 2 HPO 4 (Merck), EDTA, C 10 H 16 N 2 O 8 (Merck), KOH (Merck), and distilled water were used as starting materials. These reagents were used without any further purification.

Journal of the American Ceramic Society, 2006

... Alumina Nanopowder Production from Synthetic Bayer Liquor. Mahyar Mazloumi 1 ,; Razieh Khalif... more ... Alumina Nanopowder Production from Synthetic Bayer Liquor. Mahyar Mazloumi 1 ,; Razieh Khalifehzadeh 1 ,; SK Sadrnezhaad 1,*,‡ ,; Hamed Arami 2. Article first published online: 24 OCT 2006. DOI: 10.1111/j.1551-2916.2006.01285.x. Issue. ...

Journal of Magnetism and Magnetic Materials, 2010

Journal of Crystal Growth, 2008

Journal of Crystal Growth, 2007

Journal of Alloys and Compounds, 2009

Nanostructure ZnO hollow microspheres with average crystallite size of about 15 nm, and average d... more Nanostructure ZnO hollow microspheres with average crystallite size of about 15 nm, and average diameter of about 1 m, were successfully fabricated through a novel hydrothermal method. Hollow microspheres were formed due to self-assembly of ZnO oblong nanoparticles, which resulted in formation of a protrusive surface nanostructure. The obtained material was characterized with X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL) investigations. The photoluminescence characterization of the nanostructure microspheres exhibited a UV irradiation at around 380 nm and a broad visible emission band centered at green region.

Journal of Alloys and Compounds, 2008

Journal of Alloys and Compounds, 2008

ABSTRACT Lead oxide (Pb3O4) nanorods with average diameter of about 90nm, average length of ∼1.5μ... more ABSTRACT Lead oxide (Pb3O4) nanorods with average diameter of about 90nm, average length of ∼1.5μm and average crystallite size of about 42nm, were prepared through a novel surfactant free hydrothermal route and were characterized with XRD, SEM and TEM investigations. Selected area electron diffraction pattern captured from a single nanorod with average diameter of 80nm, confirmed the tetragonality of Pb3O4 lattice structure and 〈211〉 growth direction of the typical nanorods. The possible suggested mechanism is that the oriented attachment of Cl−-capped PbO2 clusters and their subsequent decomposition under hydrothermal environment resulted in formation of Pb3O4 nanorods.

Journal of Alloys and Compounds, 2009

Nanostructure sword-like ZnO wires with diameters of about 80-250 nm and the length of ∼1-4 m hav... more Nanostructure sword-like ZnO wires with diameters of about 80-250 nm and the length of ∼1-4 m have been synthesized by a fast, simple and template-free microwave-assisted method. X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and room temperature photoluminescence (PL) measurements was used for characterization of the as-prepared products. The nanostructure sword-like ZnO wires have high crystallinity with the average crystallite size of about 53 nm and show a UV emission and a visible green band in their PL spectrum. The possible growth mechanism of the nanostructures along the 0 0 2 crystallographic direction and subsequent formation of wires were also investigated.

Journal of Alloys and Compounds, 2009

Hydroxyapatite (HAp) nanostrips were rapidly obtained during a mild microwave heating method. App... more Hydroxyapatite (HAp) nanostrips were rapidly obtained during a mild microwave heating method. Applying microwave irradiation to Ca(NO 3) 2 •4H 2 O/CTAB/Na 2 HPO 4 precursor solution, the HAp precipitation process was occurred directly and without common crystallographic transformations including dissolution and slow recrystallization. The cationic surfactant CTAB was used as a soft template to modify nucleation and growth process. TEM investigations showed that the fabricated nanostrips had a width and length of about 10 and 55 nm, respectively. The X-ray diffraction pattern revealed that the fabricated well-crystallized and high purity hydroxyapatite nanostrips had a pattern similar to the bone mineral. The FTIR spectrum of the synthesized HAp nanostrips confirmed the crystallization degree observed in X-ray diffraction pattern. Moreover, the effect of CTAB on formation mechanism of the fabricated nanostrips was investigated.

Journal of Alloys and Compounds, 2017

Optimum operating parameters for pulse co-deposition of nano-Al 2 O 3 with Cr from a trivalent ch... more Optimum operating parameters for pulse co-deposition of nano-Al 2 O 3 with Cr from a trivalent chromium bath onto Cu cathod are selected by using "technique for order performance by similarity to ideal solution" (TOPSIS), "VIšekriterijumsko KOmpromisno Rangiranje" (VIKOR), "elimination and choice expressing the reality" (ELECTRE) and "complex proportional assessment" (CORPAS) accompanied with analytic hierarchy processing (AHP) to compare methods for achievement of the best tribological coating performance. Criteria for appropriate selection include wear loss, corrosion resistance, microhardness, bath condition and current efficiency. Results ascertain the best Cr-Al 2 O 3 nano-composite coating with 40% duty cycle, 10 Hz current frequency and 1 g/L nano-Al 2 O 3 dispersed into the electrolyte bath. Comparison of the different calculated Speraman's coefficients weighed with the «subjective» analytic hierarchy process indicates more consistent results than «objective» entropy technique. The study clarifies the comparative capability of the weighing and the ranking methods in choosing the best way to make consistent final results independent of the level of knowledge and standpoints of the researchers. Recommendation of subjective rather than objective weighing apparatus to the MCDM researchers is therefore a constructive achievement.

Journal of Alloys and Compounds, 2018

Thermal-sprayed MCrAlY coatings have become widespread in various industries such as power plants... more Thermal-sprayed MCrAlY coatings have become widespread in various industries such as power plants, aeronautics, and oil and gas firms. High-temperature oxidation behavior of these coatings is therefore of significance. Spraying of two prevalent MCrAlY powders (NiCoCrAlY and CoNiCrAlY) on Hastelloy substrate by high velocity oxygen and fuel method and exposing them to 1000 °C air for resolving of their cyclic oxidation behavior are presented in this paper. The coatings were characterized by x-ray diffraction, scanning electron microscopy and energydispersive x-ray spectroscopy. The obtained oxidation kinetic indicated that at 1000 °C, the thermally sprayed NiCoCrAlY coating has greater resistance to oxidation than CoNiCrAlY. While oxidation rate of the former follows a parabolic rate equation with specific rate of 5.1×10-3 (µm) 2 .h-1 at 1000 °C, the oxidation rate for the latter has a specific rate of 12.1×10-3 (µm) 2 .h-1 .

Metallurgical and Materials Transactions B, 2015

Gold nanoparticles (AuNPs) of less than 50 nm diameter were electrodeposited from cyanide solutio... more Gold nanoparticles (AuNPs) of less than 50 nm diameter were electrodeposited from cyanide solution by pulsating electric current on modified copper and indium tin oxide (ITO) films coated on glass. Morphology, size, and composition of the deposited AuNPs were studied by X-ray photoelectron spectroscopy, atomic force microscopy, and field emission scanning electron microscopy. Effects of peak current density, pulse frequency, potassium iodide and cysteine on grain size, and morphology of the AuNPs were determined. Experiments showed that cathode current efficiency increases with the pulse frequency and the iodide ion. Size of the AuNPs increased with the current density. The number of nucleation sites was larger on ITO than on Cu layer; while the average diameter of the crystallites on ITO was smaller than on Cu layer.

Materials and Manufacturing Processes, 2014

Aluminum matrix composites (AMCs) are candidate materials for total joint arthroplasty, dental pr... more Aluminum matrix composites (AMCs) are candidate materials for total joint arthroplasty, dental prostheses, cutting tools, and biomedical gadgets owing to their strength, machinability, dimension accuracy, and wear resistance. A novel method for manufacturing new generation of AMCs by addition of 10Ce-TZP(tetragonal zirconia polycrystal)/Al 2 O 3 nanoparticles to aluminum via powder metallurgy is devised. Aqueous combustion synthesis is used for dispersoid production and milling-compaction-sintering for AMC fabrication. Effects of 10Ce-TZP/Al 2 O 3 content on hardness, erosion, and wear resistance are investigated. Scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and pin-on-disk analyses are used to explore worn interface, morphology, mechanism of abrasion, and resistance to wear. By addition of 7 wt% dispersoid, considerable increase in hardness and resistance to wear are achieved.

Lanthanum hydroxide (La(OH) 3) nanostructures, including elliptical nanoparticles, octahedral rod... more Lanthanum hydroxide (La(OH) 3) nanostructures, including elliptical nanoparticles, octahedral rods and irregular nanoparticles were prepared chemically in NaOH and KOH solutions with 10 M concentration. The obtained powders were characterized with XRD, SEM, TEM and DTA. Crystallinities, morphologies and thermal behavior of the obtained nanostructure powders were investigated under the influence of above mentioned solvents. The effect of chemical's temperature was also determined in one of the solvents (i.e. NaOH). The formation of growth in nanostructure mechanism under the influence of alkali solutions (i.e., KOH and NaOH) have been discussed considerably in this paper.

Journal of Molecular Structure, 2014

ABSTRACT This study proposes a common approach for growing multiwall carbon nanotubes (MWCNTs) on... more ABSTRACT This study proposes a common approach for growing multiwall carbon nanotubes (MWCNTs) on nickel nanodeposits. MWCNT growth was performed in two separate stages. In the first stage, nickel nanodeposits were electrodeposited on n-Si(1 1 1):H substrate in the presence of sulfuric acid. Based on atomic force microscopy (AFM) observations, the nickel deposits had a fairly polygonal morphology and were distributed on the prepared n-Si(1 1 1):H substrate. In the second stage, acetylene gas was decomposed on the surfaces of the nickel nanodeposits using chemical vapor deposition method at 700 °C. When carbon is saturated in a catalyst, it acts as a primary nucleating element for MWCNT growth. The structure of the MWCNTs was also investigated using scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectroscopy. Results showed that the synthesized MWCNTs had a small wall thickness and were formed under the experimental conditions applied to the system.

Materials Letters, 2007

Polypyrrole/multiwall carbon nanotube (PPy/MWCNT) nanocomposites were successfully synthesized by... more Polypyrrole/multiwall carbon nanotube (PPy/MWCNT) nanocomposites were successfully synthesized by electropolymerization of MWCNTdispersed pyrrole solution on the surface of copper electrodes. The obtained nanocomposites were characterized with scanning electron microscopy (SEM), linear sweep voltammetry (LSV) and thermal gravimetric analysis (TGA). Polypyrrole structures which embraced the MWCNTs led to the formation of nanocomposite striated parallel walls. MWCNTs acted as appropriate substrates for electrodeposition of polypyrrole particulate structures and high yield synthesis of PPy was observed on them. Smooth PPy/MWCNT nanocomposite films were obtained on Cu electrodes by decreasing the potential scan rate. Thermogravimetric analysis showed that MWCNTs increased the thermal stability of polypyrrole.

Materials Chemistry and Physics, 2010

Journal of the American Ceramic Society, 2008

Journal of the American Ceramic Society, 2007

Journal of the American Ceramic Society, 2008

Self-assembled dandelion-like hydroxyapatite (HAp) nanostructures were successfully synthesized v... more Self-assembled dandelion-like hydroxyapatite (HAp) nanostructures were successfully synthesized via a mild template-free hydrothermal process, using ethylenediaminetetraacetic acid (EDTA) as the surfactant. The obtained dandelion-like HAp nanostructures were between 5 and 8 lm in diameter and were composed of radially oriented nanorods with an average diameter of about 200 nm. The X-ray diffraction analysis and Fourier transform infrared spectroscopy were used to characterize the crystalline phase and purity of the synthesized nanostructures. The Brunauer-Emmett-Teller surface area of the dandelion-like nanostructures was measured to be about 39 m 2 /g. The results of thermal analysis revealed that dandelion-like HAp nanostructures have appropriate thermal stability up to 12001C. Scanning electron microscopy and transmission electron microscopy analyses showed that EDTA plays an important role in obtaining the dandelion-like morphology, because without it, only monodispersed HAp nanoparticles with an average diameter of about 125 nm were formed. The mechanism for the formation of dandelion-like HAp nanostructures was suggested based on the radial self-assembly of Ca-EDTA molecular complexes. II. Experimental Procedures (1) Sample Preparation Nanostructure HAp was prepared via a hydrothermal synthesis technique. Analytical-grade CaCl 2 (Merck, Darmstadt, Germany), K 2 HPO 4 (Merck), EDTA, C 10 H 16 N 2 O 8 (Merck), KOH (Merck), and distilled water were used as starting materials. These reagents were used without any further purification.

Journal of the American Ceramic Society, 2006

... Alumina Nanopowder Production from Synthetic Bayer Liquor. Mahyar Mazloumi 1 ,; Razieh Khalif... more ... Alumina Nanopowder Production from Synthetic Bayer Liquor. Mahyar Mazloumi 1 ,; Razieh Khalifehzadeh 1 ,; SK Sadrnezhaad 1,*,‡ ,; Hamed Arami 2. Article first published online: 24 OCT 2006. DOI: 10.1111/j.1551-2916.2006.01285.x. Issue. ...

Journal of Magnetism and Magnetic Materials, 2010

Journal of Crystal Growth, 2008

Journal of Crystal Growth, 2007

Journal of Alloys and Compounds, 2009

Nanostructure ZnO hollow microspheres with average crystallite size of about 15 nm, and average d... more Nanostructure ZnO hollow microspheres with average crystallite size of about 15 nm, and average diameter of about 1 m, were successfully fabricated through a novel hydrothermal method. Hollow microspheres were formed due to self-assembly of ZnO oblong nanoparticles, which resulted in formation of a protrusive surface nanostructure. The obtained material was characterized with X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL) investigations. The photoluminescence characterization of the nanostructure microspheres exhibited a UV irradiation at around 380 nm and a broad visible emission band centered at green region.

Journal of Alloys and Compounds, 2008

Journal of Alloys and Compounds, 2008

ABSTRACT Lead oxide (Pb3O4) nanorods with average diameter of about 90nm, average length of ∼1.5μ... more ABSTRACT Lead oxide (Pb3O4) nanorods with average diameter of about 90nm, average length of ∼1.5μm and average crystallite size of about 42nm, were prepared through a novel surfactant free hydrothermal route and were characterized with XRD, SEM and TEM investigations. Selected area electron diffraction pattern captured from a single nanorod with average diameter of 80nm, confirmed the tetragonality of Pb3O4 lattice structure and 〈211〉 growth direction of the typical nanorods. The possible suggested mechanism is that the oriented attachment of Cl−-capped PbO2 clusters and their subsequent decomposition under hydrothermal environment resulted in formation of Pb3O4 nanorods.

Journal of Alloys and Compounds, 2009

Nanostructure sword-like ZnO wires with diameters of about 80-250 nm and the length of ∼1-4 m hav... more Nanostructure sword-like ZnO wires with diameters of about 80-250 nm and the length of ∼1-4 m have been synthesized by a fast, simple and template-free microwave-assisted method. X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and room temperature photoluminescence (PL) measurements was used for characterization of the as-prepared products. The nanostructure sword-like ZnO wires have high crystallinity with the average crystallite size of about 53 nm and show a UV emission and a visible green band in their PL spectrum. The possible growth mechanism of the nanostructures along the 0 0 2 crystallographic direction and subsequent formation of wires were also investigated.

Journal of Alloys and Compounds, 2009

Hydroxyapatite (HAp) nanostrips were rapidly obtained during a mild microwave heating method. App... more Hydroxyapatite (HAp) nanostrips were rapidly obtained during a mild microwave heating method. Applying microwave irradiation to Ca(NO 3) 2 •4H 2 O/CTAB/Na 2 HPO 4 precursor solution, the HAp precipitation process was occurred directly and without common crystallographic transformations including dissolution and slow recrystallization. The cationic surfactant CTAB was used as a soft template to modify nucleation and growth process. TEM investigations showed that the fabricated nanostrips had a width and length of about 10 and 55 nm, respectively. The X-ray diffraction pattern revealed that the fabricated well-crystallized and high purity hydroxyapatite nanostrips had a pattern similar to the bone mineral. The FTIR spectrum of the synthesized HAp nanostrips confirmed the crystallization degree observed in X-ray diffraction pattern. Moreover, the effect of CTAB on formation mechanism of the fabricated nanostrips was investigated.