Facile synthesis of direct sunlight-driven anatase TiO2 nanoparticles by in situ modification with trifluoroacetic acid

2012 ◽  
Vol 14 (10) ◽  
Author(s):  
Xiangfu Meng ◽  
Lin Qi ◽  
Zhichang Xiao ◽  
Shuyan Gong ◽  
Qingli Wei ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Trifluoroacetic Acid ◽  
Anatase Tio2 ◽  
Direct Sunlight ◽  
Facile Synthesis ◽  
In Situ Modification

In situ total X-ray scattering study of the formation mechanism and structural defects in anatase TiO2 nanoparticles under hydrothermal conditions

CrystEngComm ◽  
2015 ◽  
Vol 17 (36) ◽  
pp. 6868-6877 ◽  
Author(s):  
Jian-Li Mi ◽  
Kirsten M. Ø. Jensen ◽  
Christoffer Tyrsted ◽  
Martin Bremholm ◽  
Bo B. Iversen
Keyword(s):  
Tio2 Nanoparticles ◽  
Anatase Tio2 ◽  
Structural Defects ◽  
Growth Mechanisms ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
X Ray Scattering ◽  
Anatase Nanoparticles ◽  
Scattering Study

The in situ PDF method provides detailed information about the formation and growth mechanisms of TiO2 anatase nanoparticles under hydrothermal conditions.

scholarly journals Facile synthesis of improved anatase TiO2 nanoparticles for enhanced solar-light driven photocatalyst

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
G. Nagaraj ◽  
D. Brundha ◽  
C. Chandraleka ◽  
M. Arulpriya ◽  
V. Kowsalya ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Anatase Tio2 ◽  
Solar Light ◽  
Facile Synthesis

scholarly journals Anatase TiO2 Nanoparticles: Facile Synthesis via Non-aqueous Precipitation and Photocatalytic Property

2018 ◽  
Vol 33 (10) ◽  
pp. 1136
Author(s):  
JIANG Feng ◽  
YU Yun ◽  
FENG Ai-Hu ◽  
YU Yang ◽  
MI Le ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Photocatalytic Property ◽  
Anatase Tio2 ◽  
Facile Synthesis

The Improved Synthesis of Boc-Abu(PO3Me2)-OH and Its Use for the Facile Synthesis of Glu-Abu(P)-Leu

1992 ◽  
Vol 45 (8) ◽  
pp. 1225 ◽  
Author(s):  
G Tong ◽  
JW Perich ◽  
RB Johns
Keyword(s):  
Trifluoroacetic Acid ◽  
Optical Purity ◽  
High Yield ◽  
Facile Synthesis ◽  
Tributyltin Hydride ◽  
Step Procedure ◽  
Sodium Borohydride Reduction ◽  
Methyl Phosphate ◽  
Phosphate Groups

The improved synthesis of Boc -L-Abu(PO3Me2)-OH from Boc-Asp-Obut in 42% overall yield is described. This derivative was prepared in seven steps and involved initial sodium borohydride reduction of the isobutoxycarbonyl mixed anhydride of BOC-Asp-OBut and subsequent 2,2,6,6- tetramethylpiperidine-1-oxyl-catalysed sodium hypochlorite oxidation of the alcohol. The resultant aldehyde was phosphonylated by reflux with dimethyl trimethylsilyl phosphite and the trimethylsilyl group was then cleaved in situ by aqueous hydrolysis. The 4-hydroxy 4-dimethylphosphono derivative was converted into the Abu(PO3Me2) residue by reaction with thiocarbonyldiimidazole followed by radical deoxygenation of the thiocarbonylimidazolide with tributyltin hydride. The Boc and t-butyl groups were cleaved from BOC-Abu(PO3Me2)-OBut with trifluoroacetic acid and the Boc group was reintroduced to CF3CO2H.H-Abu(PO2Me2)-OH by using di-t-butyl dicarbonate to give Boc -Abu(PO3Me2)-OH as a clear oil. The optical purity of the Abu(PO3Me2) residue was established to be greater than 99.5% of the L-isomer by h.p.1.c. analysis of its L- Leu dipeptide. The protected derivative Boc-Abu(PO3Me2)-OH was used in the Boc mode of peptide synthesis for the preparation of Boc-Glu (OBz1)-Abu(PO3Me2)-Leu-OBzl in high yield, 40% CF3CO2H/CH2Cl2 being used for cleavage of the Boc group from intermediate peptides. The tripeptide was deprotected to CF3CO2H.H-Glu-Abu(P)- Leu -OH by a two-step procedure which involved initial hydrogenolytic cleavage of the benzyl groups in 50% CF3CO2H/CH3CO2H followed by cleavage of the methyl phosphate groups with either (A) 30% bromotrimethylsilane in acetonitrile, or (B) 1 M bromotrimethylsilane /l M thioanisole in trifluoroacetic acid; complete cleavage of the methyl groups was effected after 40 min and 12 h, respectively. In addition, the dipeptide Boc-Leu-Abu (P03Me2)- OBut was prepared from Boc-Abu(PO3Me2)-OBut in high yield and was readily deprotected by acidolytic cleavage of the t-butyl groups with trifluoroacetic acid followed by silylitic cleavage of the methyl phosphonate groups with 30% bromotrimethylsilane in acetonitrile, CF3CO2H.H-Leu-Abu(P)-OH being obtained in high yield.

scholarly journals In situ X-ray scattering study of hydrothermal synthesis of anatase TiO2 nanoparticles from commercial precursor TiOSO4

2019 ◽  
Vol 75 (a2) ◽  
pp. e643-e643
Author(s):  
Frederik Søndergaard-Pedersen ◽  
Nils Lau Nyborg Broge ◽  
Jinlong Yu ◽  
Aref Mamakhel ◽  
Jonas Beyer ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Tio2 Nanoparticles ◽  
Anatase Tio2 ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

Pulsed supercritical synthesis of anatase TiO2 nanoparticles in a water–isopropanol mixture studied by in situ powder X-ray diffraction

Nanoscale ◽  
2013 ◽  
Vol 5 (6) ◽  
pp. 2372 ◽  
Author(s):  
Jakob Rostgaard Eltzholtz ◽  
Christoffer Tyrsted ◽  
Kirsten Marie Ørnsbjerg Jensen ◽  
Martin Bremholm ◽  
Mogens Christensen ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Anatase Tio2 ◽  
X Ray Diffraction ◽  
X Ray ◽  
Supercritical Synthesis

In-situ Modification of Graphene Oxide by Insoluble Sulfur and Application for Nitrile Butadiene Rubber

2020 ◽  
Vol 35 (2) ◽  
pp. 221-228
Author(s):  
S.-B. Chen ◽  
T.-X. Li ◽  
S.-H. Wan ◽  
X. Huang ◽  
S.-W. Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
In Situ Modification

scholarly journals Seawater Absorption and Adhesion Properties of Hydrophobic and Superhydrophobic Thermoset Epoxy Nanocomposite Coatings

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 272
Author(s):  
Ayman M. Atta ◽  
Mohamed H. El-Newehy ◽  
Meera Moydeen Abdulhameed ◽  
Mohamed H. Wahby ◽  
Ahmed I. Hashem
Keyword(s):  
Thermal Stability ◽  
Oleic Acid ◽  
Salt Spray ◽  
Adhesion Properties ◽  
In Situ Modification ◽  
Long Time ◽  
Seawater Environment ◽  
Thermoset Epoxy ◽  
The Cost

The enhancement of both thermal and mechanical properties of epoxy materials using nanomaterials becomes a target in coating of the steel to protect it from aggressive environmental conditions for a long time, with reducing the cost. In this respect, the adhesion properties of the epoxy with the steel surfaces, and its proper superhyrophobicity to repel the seawater humidity, can be optimized via addition of green nanoparticles (NPs). In-situ modification of silver (Ag) and calcium carbonate (CaCO3) NPs with oleic acid (OA) was carried out during the formation of Ag−OA and CaCO3−OA, respectively. The epoxide oleic acid (EOA) was also used as capping for Ca−O3 NPs by in-situ method and epoxidation of Ag−OA NPs, too. The morphology, thermal stability, and the diameters of NPs, as well as their dispersion in organic solvent, were investigated. The effects of the prepared NPs on the exothermic curing of the epoxy resins in the presence of polyamines, flexibility or rigidity of epoxy coatings, wettability, and coatings durability in aggressive seawater environment were studied. The obtained results confirmed that the proper superhyrophobicity, coating adhesion, and thermal stability of the epoxy were improved after exposure to salt spray fog for 2000 h at 36 °C.

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