Hydrothermal Preparation of Hydroxyapatite/Chitosan Nanocomposites via In Situ Precipitation

2007 ◽  
Vol 330-332 ◽  
pp. 405-408
Author(s):  
Xiao Ying Lu ◽  
Zh. Liu ◽  
Jie Weng
Keyword(s):  
Crystal Size ◽  
Ph Value ◽  
Hydrothermal Process ◽  
Hydrothermal Preparation ◽  
Nano Structure ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Low Crystalline ◽  
Electronic Microscope

The cylindrical chitosan (CS)/hydroxyapatite (HA) nanocomposites were hydrothermally prepared via in situ precipitation and characterized by x-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR), thermogravimetry (TG) and scanning electronic microscope (SEM). The results show that the as-prepared products are composed of CS and low-crystalline HA phases, and some extent of interaction between CS and HA phases exists in the composites, which is greatly influenced by the temperature and pH value in the hydrothermal process. The crystal size of HA uniform-distributed in CS matrix is calculated to be no larger than 100nm while the crystallinity of CA is greatly increased in the hydrothermal process, which is beneficial to the mechanical properties of the composites. It is proposed that the nano-structure of HA/CS composite will have the better biomedical properties in the biomaterials applications.

scholarly journals In Situ IR Characterization of CO Interacting with Rh Nanoparticles Obtained by Calcination and Reduction of Hydrotalcite-Type Precursors

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
F. Basile ◽  
I. Bersani ◽  
P. Del Gallo ◽  
S. Fiorilli ◽  
G. Fornasari ◽  
...  
Keyword(s):  
Crystal Size ◽  
Liquid Nitrogen Temperature ◽  
Transmission Electron ◽  
In Situ Ir ◽  
Ft Ir ◽  
Co Disproportionation ◽  
Ft Ir Spectroscopy

Supported Rh nanoparticles obtained by reduction in hydrogen of severely calcined Rh/Mg/Al hydrotalcite-type (HT) phases have been characterized by FT-IR spectroscopy of adsorbed CO [both at room temperature (r.t.) and nominal liquid nitrogen temperature] and Transmission Electron Microscopy (TEM). The effect of reducing temperature has been investigated, showing that Rh crystal size increases from 1.4 nm to 1.8 nm when the reduction temperature increases from 750°C to 950°C. The crystal growth favours the formation of bridged CO species and linear monocarbonyl species with respect to gem-dicarbonyl species; when CO adsorbs at r.t., CO disproportionation occurs on Rh and it accompanies the formation of RhI(CO)2. The role of interlayer anions in the HT precursors to affect the properties of the final materials has been also investigated considering samples prepared from silicate-instead of carbonate-containing precursors. In this case, formation of RhI(CO)2 and CO disproportionation do not occur, and this evidence is discussed in terms of support effect.

Novel Hierarchical YBO3 :Eu3+ Nanocrystals Synthesized by Folic Acid Assisted Hydrothermal Process

MRS Advances ◽  
2019 ◽  
Vol 5 (31-32) ◽  
pp. 1661-1670
Author(s):  
Xianj. Xing ◽  
Shan Li ◽  
Yuq. Song ◽  
Yingz. Ge ◽  
Xuef. Zhang ◽  
...  
Keyword(s):  
Folic Acid ◽  
Self Assembly ◽  
Growth Process ◽  
Ph Value ◽  
Hydrothermal Process ◽  
Photoluminescence Intensity ◽  
Capping Agent ◽  
Hydrothermal Route ◽  
Small Flower

ABSTRACTYBO3:Eu3+ crystals with flower-like hierarchitecture are readily synthesized through a folic acid assisted hydrothermal process using polyborate precursors in the aqueous solution. It was found that the pH value , borate/yittrium ratio and the mass of folic acid take effects on the morphology and photoluminescence emission intensity of YBO3:Eu3+ crystals. The product with the small flower-like hierarchitecture was obtained under the conditions of pH value at 9, borate/yittrium ratio at 2 and the mass of folic acid at 0.44 g, showing the strongest photoluminescence intensity. The growth process of the YBO3:Eu3+ flowers and microflowers was invesitgated based on the time-dependent experiments, which showed that the growth mechanism of the flower-like hierarchitecture follows an in situ growth rather than self-assembly process as reported previously. Such a hydrothermal route using folic acid as a capping agent may provide a green and effective method for fabricating useful and complex 3D architectures of LEDs phosphors.

Characterization of Epoxidized Rubber Seed Oil

2017 ◽  
Vol 728 ◽  
pp. 295-300
Author(s):  
Jutamas Kantee ◽  
Somjai Kajorncheappunngam
Keyword(s):  
Seed Oil ◽  
Proton Nuclear Magnetic Resonance ◽  
Epoxide Ring ◽  
Rubber Seed Oil ◽  
Spectra Analysis ◽  
Rubber Seed ◽  
H Nmr ◽  
Infrared Spectrometer ◽  
Ft Ir

Epoxidation of rubber seed oil was carried out using a peroxyacid generated in situ from glacial acetic acid and hydrogen peroxide to produce epoxidized rubber seed oil. The maximum relative conversion to oxirane of 88 % could be obtained at 60 °C after a reaction time of 7 hours. The presence of oxirane ring of epoxidized rubber seed oil was confirmed by fourier transform infrared spectrometer (FT-IR) and proton nuclear magnetic resonance (1H NMR) spectra analysis which displayed a disappearance of double bonds peak in rubber seed oil and an existing of epoxide ring peak in epoxidized rubber seed oil.

Fourier Transform Infrared Spectrometer Coupled with Electrothermal Atomizer for High-Temperature Vapor-Phase Investigations

1984 ◽  
Vol 38 (5) ◽  
pp. 715-720 ◽  
Author(s):  
Paolo Tittarelli ◽  
Tiziana Zerlia ◽  
Giovanna Ferrari
Keyword(s):  
Fourier Transform ◽  
Vapor Phase ◽  
Fourier Transform Infrared ◽  
Infrared Spectrometry ◽  
Pyrolysis Products ◽  
Electrothermal Atomizer ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Phase Behaviors

An electrothermal atomizer is employed to vaporize solid samples of pigments at temperatures ranging from 150°C to 1000°C The evolution of vapors is followed by Fourier transform infrared spectrometry (FT-IR) The atomizer acts at the same time as vapor supplier and vapor holder This coupling allows the investigation in situ of vaporization or pyrolysis phenomena avoiding the use of heated transfer pipes The pigments examined in this study show various vapor-phase behaviors Some pigments vaporize without appreciable decomposition at temperatures from 400°C to 950°C, while other pigments investigated decompose during the heating and originate pyrolysis products whose evolution is monitored continuously by the FT-IR spectrometer

scholarly journals Effect of Poly (Sodium 4-Styrene Sulfonate) on the Morphology of Hydroxyapatite Particles

2009 ◽  
Vol 2009 ◽  
pp. 1-3 ◽  
Author(s):  
Nesa Esmaeilian Tari ◽  
Mohammad Mahdi Kashani Motlagh
Keyword(s):  
Electron Microscopy ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Nano Structure ◽  
X Ray ◽  
Styrene Sulfonate ◽  
Atomic Force ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Scanning Electron

Nanorods hydroxyapatite, (HAP) is successfully prepared by water in oil microemulsion using, and (water phase), poly(sodium 4-styrene sulfonate) (PSSS) as template and cyclohexane as oil phase. The nano-structure of the product was studied by means of X-ray diffraction (XRD), Fourier transmission infrared spectrometer (FT-IR), scanning electron microscopy (SEM), and atomic force microscope (AFM). With this system, we could synthesize nano-particles of hydroxyapatite with high crystallinity and least agglomeration.

Studies on Polyaniline/Silver Molybdate Nanocomposites

2014 ◽  
Vol 13 (01) ◽  
pp. 1450002 ◽  
Author(s):  
K. Jacinth Mispa ◽  
P. Subramaniam ◽  
R. Murugesan
Keyword(s):  
Oxidative Polymerization ◽  
Hydrothermal Process ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silver Molybdate ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Silver molybdate nanoparticles were successfully prepared by the hydrothermal process. Polyaniline–silver molybdate nanocomposites were prepared by in situ chemical oxidative polymerization technique. Silver molybdate nanoparticles and the polymer samples were characterized by conductivity studies, Fourier transform infrared spectra (FT-IR), UV-visible spectra, photoluminescence spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The electrical conductivity of PANI- Cl - increases when doped with silver molybdate nanoparticles and follows the percolation threshold.

Poly(Acrylic Acid)/Bentonite Composites for Removing High Concentration of Methylene Blue

2013 ◽  
Vol 773 ◽  
pp. 472-476 ◽  
Author(s):  
Yan Wang ◽  
Yu Feng He ◽  
Ling Zhang ◽  
Rong Li ◽  
Li Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Acrylic Acid ◽  
In Situ Polymerization ◽  
Ph Value ◽  
Physical Adsorption ◽  
High Concentration ◽  
Ft Ir ◽  
Polymer Adsorbent ◽  
Poly Acrylic Acid

The poly (acrylic acid)/Bentonite composites (PAA/Bent) was prepared by in-situ polymerization. The structure of PAA/Bent was characterized by FT-IR, XRD and SEM, which indicated that AA intercalated into the interlayers of bentonite, and composite was formed between Bent and PAA. The PAA/Bent was used as a polymer adsorbent to remove methylene blue, a typical cationic dyes. Some important influencing factors on removing MB by PAA/Bent were investigated. The optimum adsorption conditions were obtained as following: the PAA/Bent dosage is 0.08 g, contacting 20 min at room temperature (25 °C), the pH value had little effect on MB adsorption, PAA/Bent can be used to treat wastewater with a broad range of pH value. The removal ratio of MB got to 99.4 %, and the adsorption capacity was 310.7 mgg-1. The removal mechanism is also investigated. It was charge neutralization and physical adsorption. In summary, the results indicated that PAA/Bent is an effective adsorbent and can be used to treat high concentration of MB wastewater.

FT-IR microspectroscopic analysis of diseased white matter brain tissues

1995 ◽  
Vol 53 ◽  
pp. 968-969
Author(s):  
Steven M. Le Vine ◽  
David L. Wetzel
Keyword(s):  
White Matter ◽  
Gray Matter ◽  
Twitcher Mouse ◽  
Grid Pattern ◽  
Marked Contrast ◽  
Spatially Resolved ◽  
Ft Ir ◽  
Ir Microspectroscopy ◽  
Chemical Evidence

In situ FT-IR microspectroscopy has allowed spatially resolved interrogation of different parts of brain tissue. In previous work the spectrrscopic features of normal barin tissue were characterized. The white matter, gray matter and basal ganglia were mapped from appropriate peak area measurements from spectra obtained in a grid pattern. Bands prevalent in white matter were mostly associated with the lipid. These included 2927 and 1469 cm-1 due to CH2 as well as carbonyl at 1740 cm-1. Also 1235 and 1085 cm-1 due to phospholipid and galactocerebroside, respectively (Figs 1and2). Localized chemical changes in the white matter as a result of white matter diseases have been studied. This involved the documentation of localized chemical evidence of demyelination in shiverer mice in which the spectra of white matter lacked the marked contrast between it and gray matter exhibited in the white matter of normal mice (Fig. 3).The twitcher mouse, a model of Krabbe’s desease, was also studied. The purpose in this case was to look for a localized build-up of psychosine in the white matter caused by deficiencies in the enzyme responsible for its breakdown under normal conditions.

Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

2020 ◽  
Vol 16 (7) ◽  
pp. 880-892
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna Sezer ◽  
Erol Pehlivan
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Wood Sawdust ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Equilibrium Status

Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents. Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process. Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions. Conclusıon: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.

scholarly journals Physical and mechanical properties of rubberwood (Hevea brasiliensis) dyed with Lasiodiplodia theobromae

2019 ◽  
Vol 65 (1) ◽  
Author(s):  
Boshi Zhao ◽  
Zhiming Yu ◽  
Yang Zhang ◽  
Chusheng Qi
Keyword(s):  
Mass Loss ◽  
Water Absorption ◽  
Hevea Brasiliensis ◽  
Ph Value ◽  
Energy Dispersive Spectrometer ◽  
Physical And Mechanical Properties ◽  
Blue Staining ◽  
Loss Ratio ◽  
Lasiodiplodia Theobromae ◽  
Infrared Spectrometer

AbstractBlue staining on rubberwood (Hevea brasiliensis) is a common kind of defect. There currently exists much research focused on the prevention and control of blue staining. However, little research has been concentrated on the utilization of blue staining for green dyeing. The research conveyed in this paper primarily used Lasiodiplodia theobromae to dye rubberwood, and used scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD), and fourier transform infrared spectrometer (FTIR) to analyze the commission internationale eclairage (CIE) L*a*b* value of color, the contact angle, the pH value, 24-h water absorption, mass loss ratio, and compressive strength in increments between 5 and 40 days. The results found that the color of rubberwood became darker and more uniform, and that the surface dyed with fungi can reach a super-hydrophobic state. With the increase of time, the pH value of rubberwood changed from acidic to alkaline. Furthermore, hyphae entered the wood mainly through vessels for their large pore diameter, and reduced water absorption. Mass loss ratio increased gradually between 5 and 40 days. The research in this paper concludes that the microorganism was an effective method of wood dyeing, and lays a foundation for further research.

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