Surfactant-assisted fabrication PbS nanorods, nanobelts, nanovelvet-flowers and dendritic nanostructures at lower temperature in aqueous solution

2006 ◽  
Vol 301 (2) ◽  
pp. 503-510 ◽  
Author(s):  
Lihong Dong ◽  
Ying Chu ◽  
Yang Liu ◽  
Meiye Li ◽  
Fuyong Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dendritic Nanostructures ◽  
Lower Temperature ◽  
Surfactant Assisted

scholarly journals Practical Synthesis of 2-Iodosobenzoic Acid (IBA) without Contamination by Hazardous 2-Iodoxybenzoic Acid (IBX) under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1897
Author(s):  
Hideyasu China ◽  
Nami Kageyama ◽  
Hotaka Yatabe ◽  
Naoko Takenaga ◽  
Toshifumi Dohi
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Practical Method ◽  
Hypervalent Iodine ◽  
Mild Conditions ◽  
Sequential Procedures ◽  
Iodine Compounds ◽  
Practical Synthesis ◽  
Iodosobenzoic Acid ◽  
Lower Temperature

We report a convenient and practical method for the preparation of nonexplosive cyclic hypervalent iodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy group under mild conditions of 80 °C or lower temperature. These sequential procedures are highly reliable to selectively afford cyclic hypervalent iodine compounds in excellent yields without contamination by hazardous pentavalent iodine(III) compound.

Thermal degradation of EDTA chelates in aqueous solution

1982 ◽  
Vol 60 (10) ◽  
pp. 1207-1213 ◽  
Author(s):  
Ramunas J. Motekaitis ◽  
X. B. Cox III ◽  
Patrick Taylor ◽  
Arthur E. Martell ◽  
Brad Miles ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermal Degradation ◽  
Elevated Temperatures ◽  
Degradation Products ◽  
Iminodiacetic Acid ◽  
Reaction Products ◽  
Degradation Rates ◽  
Lower Temperature Range ◽  
Higher Temperature ◽  
Lower Temperature

The thermal degradation of Ca(II), Mg(II), Zn(II), Fe(II), and Ni(II) chelates of EDTA was investigated in alkaline aqueous solution at elevated temperatures (230–310 °C). The kinetics of decomposition were followed by nmr, titrimetry, and spectrophotometry. Reaction products were identified through nmr and by gas chromatography. The relative order of degradation rates, as measured by the loss of EDTA, was found to be Mg(II) > Ca(II) > Zn(II) > Fe(II) > Ni(II). The main degradation products formed in the lower temperature range (~250 °C) are iminodiacetic acid, hydroxyethyliminodiacetic acid, and ethylene glycol. Higher temperature products are primarily dimethylamine and carbon dioxide. The rates of degradation of Ca(II), Mg(II), and Zn(II) EDTA chelates are considerably enhanced when either phosphate is present or a glass-lined autoclave is employed.

In situformation of Ag flowerlike and dendritic nanostructures in aqueous solution and hydrolysis of an amphiphilic block copolymer

2005 ◽  
Vol 16 (10) ◽  
pp. 2048-2051 ◽  
Author(s):  
Wei-Tai Wu ◽  
Wenmin Pang ◽  
Guoyong Xu ◽  
Lei Shi ◽  
Qingren Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Block Copolymer ◽  
Amphiphilic Block Copolymer ◽  
Dendritic Nanostructures ◽  
Hydrolysis Of

Surfactant-Assisted Growth of Novel La2(MoO4)3 Dendritic Nanostructures via Facile Hydrothermal Processes

2008 ◽  
Vol 8 (3) ◽  
pp. 1468-1472 ◽  
Author(s):  
Na Zhang ◽  
Wenbo Bu ◽  
Yunpeng Xu ◽  
Danyu Jiang ◽  
Jianlin Shi
Keyword(s):  
Controlled Synthesis ◽  
Photoluminescence Properties ◽  
Nanostructure Fabrication ◽  
Action Mechanism ◽  
Hydrothermal Processes ◽  
Dendritic Nanostructures ◽  
Experimental Parameters ◽  
Hydrothermal Approach ◽  
First Time ◽  
Surfactant Assisted

In this paper, we report for the first time the successful synthesis of novel uniform La2(MoO4)3 dendritic single-crystalline nanostructures via a surfactant-assisted hydrothermal approach. The dendritic nanostructure is composed of trunks with length of several micrometers and plenty of side branches. Both of the trunks and the branches are composed of nanoflakes with thickness of 30–50 nm. The branches are oriented nearly parallel to each other and form an angle of about 45° to the trunk. The polyethylene glycol (PEG) acts as a morphology-directing agent, and by adjusting the experimental parameters, the microstructure of the processed materials could be further controlled in a certain range. The action mechanism of the surfactant has been proposed. This method is a simple and economical route for nanostructure fabrication and might provide a practical reference to the controlled synthesis of other micro-architectures. In addition, the photoluminescence properties of La2(MoO4)3:Eu dendritic nanostructures were studied.

Surfactant-assisted synthesis of ZIF-8 nanocrystals in aqueous solution via microwave irradiation

CrystEngComm ◽  
2014 ◽  
Vol 16 (38) ◽  
pp. 8994-9000 ◽  
Author(s):  
Tiantian Xing ◽  
Yongbing Lou ◽  
Qilong Bao ◽  
Jinxi Chen
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Surfactant Assisted

Surfactant-assisted synthesis and characterization of silver nanorods and nanowires by an aqueous solution approach

2006 ◽  
Vol 289 (1) ◽  
pp. 255-259 ◽  
Author(s):  
Guangjun Zhou ◽  
Mengkai Lü ◽  
Zhongsen Yang ◽  
Haiping Zhang ◽  
Yuanyuan Zhou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Synthesis And Characterization ◽  
Solution Approach ◽  
Silver Nanorods ◽  
Surfactant Assisted

Asymmetric Reactions in Water Catalyzed by L-Proline Tethered on Thermoresponsive Ionic Copolymers

2020 ◽  
Vol 17 (9) ◽  
pp. 717-725
Author(s):  
Noriyuki Suzuki ◽  
Daisuke Mizuno ◽  
Armando M. Guidote ◽  
Shun Koyama ◽  
Yoshiro Masuyama ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Copolymer Solution ◽  
Lcst Behavior ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Thermal Stimuli ◽  
Clear Solution

L-Proline was covalently tethered on thermoresponsive ionic block copolymers that formed micelles in aqueous solutions. The block copolymers consisted of a poly(N-isopropylacrylamide) (PNIPAAm) segment and an anionic or cationic polymer segment. These copolymers exhibited lower critical solution temperature (LCST) behavior at ca. 35-40°C, and achieved thermal stimuli-induced formation and dissociation of micelles. The copolymer generated micelles in aqueous solution at a higher temperature, where a catalytic aldol reaction proceeded with high diastereo- and enantioselectivities. The micelles dissociated at lower temperature to form a clear solution such that the products could be efficiently extracted from the aqueous reaction mixture. Extraction of the aldol product with an organic solvent from the aqueous solution of the anionic copolymer was more efficient than from the nonionic copolymer solution.

Porous bacterial cellulose prepared by a facile surfactant-assisted foaming method in azodicarbonamide-NaOH aqueous solution

2012 ◽  
Vol 81 ◽  
pp. 131-134 ◽  
Author(s):  
Na Yin ◽  
Shiyan Chen ◽  
Zhe Li ◽  
Yang Ouyang ◽  
Weili Hu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Bacterial Cellulose ◽  
Surfactant Assisted

Influence of Different Precursors on the Nitrogenation Temperature of Sm2Fe17

2013 ◽  
Vol 680 ◽  
pp. 105-108
Author(s):  
Li Xin Zhao ◽  
Guo Ying Meng
Keyword(s):  
Ball Milling ◽  
Phase Structure ◽  
High Energy ◽  
Melt Spun ◽  
Before And After ◽  
Energy Ball ◽  
Melt Spun Ribbons ◽  
Lower Temperature ◽  
Surfactant Assisted ◽  
Structure Properties

Influence of nanoflakes and melt-spun ribbons on the nitrogenation temperature f Sm2Fe17 was investigated. The microstructure, phase structure, properties of the specimens before and after nitrogenation have been discussed. It is interesting found that hard magnetic Sm2Fe17N3 flakes have been synthesized by surfactant-assisted high energy ball milling and nitriding Sm2Fe17 in 3 psi of N2 gas at lower temperature 300 °C and 350 °C for 3 h. The synthesized Sm2Fe17N3 flakes still retained nanostructure and obtained a coercivity of 3.56 kOe. For the melt-spun ribbons, it needs a higher nitrogenation temperature and longer time to obtain the same coercivity values as the nanoflakes.

In situ Raman spectroscopic observation of the temperature-dependent partition of CH4 and CO2 during the growth of double hydrate from aqueous solution

2015 ◽  
Vol 93 (9) ◽  
pp. 970-975 ◽  
Author(s):  
Feifei Wang ◽  
Changling Liu ◽  
Wanjun Lu ◽  
Jiasheng Wang ◽  
Yuguang Ye
Keyword(s):  
Aqueous Solution ◽  
Spectroscopic Observation ◽  
Dissolved Gas ◽  
Temperature Dependent ◽  
Optical Cell ◽  
Raman Spectroscopic ◽  
Oceanic Sediments ◽  
Equilibrium Concentrations ◽  
Lower Temperature

Sequestration of CO2 in hydrate form within deep oceanic sediments, to simultaneously replace methane trapped in submarine hydrate, has been considered as an efficient method for CO2 reduction. Consequently, research efforts are underway to deeply understand the properties of CH4 and CO2 hydrates. In this work, CH4 + CO2 double hydrate crystals were grown from aqueous solution in a capillary high-pressure optical cell. The quantitative relationships between Raman intensity and dissolved gas (i.e., CH4 and CO2) concentration in water and in hydrate were established. The partition coefficients of CH4 and CO2 between the hydrate and aqueous phases were measured at 5 constant temperatures from 275.15 to 293.15 K. The equilibrium concentrations of dissolved CH4 and CO2 decrease with decreasing temperatures, indicating more dissolved CH4 and CO2 will be transferred from the aqueous to the hydrate phase at lower temperature. With decreasing temperature, the molality of CO2 in hydrate increases and the molality of CH4 in 51262 cavities decreases, while the sum of the molality of CH4 in 51262 cavities and molality of CO2 in hydrate keeps constant, indicating that CO2 molecules can replace more methane molecules under lower temperature only by occupying the 51262 cavities.

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