The aggregation behavior of cellulose micro/nanoparticles in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8770-8777 ◽  
Author(s):  
Wenhui Qi ◽  
Hua-Neng Xu ◽  
Lianfu Zhang
Keyword(s):  
Ionic Strength ◽  
Microcrystalline Cellulose ◽  
Aqueous Media ◽  
Aggregation Behavior

Cellulose micro/nanoparticles were obtained from cotton microcrystalline cellulose. The effect of ionic strength on the aggregation behavior of the cellulose micro/nanoparticles in aqueous media has been investigated by means of rheo-SALS.

Aggregation behavior of double hydrophilic block copolymers in aqueous media

2019 ◽  
Vol 276 ◽  
pp. 47-56 ◽  
Author(s):  
Mehul Khimani ◽  
Shin-ichi Yusa ◽  
V.K. Aswal ◽  
P. Bahadur
Keyword(s):  
Block Copolymers ◽  
Aqueous Media ◽  
Aggregation Behavior ◽  
Double Hydrophilic Block Copolymers

The Influence of Ionic Strength on the Electroassisted Filtration of Microcrystalline Cellulose

2017 ◽  
Vol 56 (44) ◽  
pp. 12789-12798 ◽  
Author(s):  
Jonas Wetterling ◽  
Sandra Jonsson ◽  
Tuve Mattsson ◽  
Hans Theliander
Keyword(s):  
Ionic Strength ◽  
Microcrystalline Cellulose

Formation and nucleophilic capture of N-nitrosiminium ions

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1148-1161 ◽  
Author(s):  
Latifa Chahoua ◽  
Alain Vigroux ◽  
Yvonne Chiang ◽  
James C Fishbein
Keyword(s):  
Ionic Strength ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Aqueous Media ◽  
Laser Flash ◽  
Azide Ion ◽  
Iminium Ions ◽  
Nucleophilic Trapping

A study of the solvolysis of a series of (N-nitrosomethylamino)arylmethyl esters and azides and the products of nucleophilic trapping of the corresponding N-nitrosiminium ion intermediates in aqueous media, 25°C, ionic strength 1 M is reported. Structure-reactivity data for the forward and reverse reactions have been obtained. In three cases, the rate constants for reactions of the cations with nucleophiles have been measured directly by laser flash photolysis. The data allow a comparison of the degree to which the N-methyl-N-nitroso functionality enhances cation stability from a thermodynamic and kinetic perspective. It has been possible to deduce that the carbon basicity of azide ion is less than 1 kcal/mol greater than that of acetate ion.Key words: nitrosiminium ions, α-acetoxynitrosamines, carbocations, iminium ions, nucleophilicity.

Modulated photophysics of an anthracene-based fluorophore within bile-salt aggregates: the effect of the ionic strength of the medium on the aggregation behavior

2015 ◽  
Vol 14 (12) ◽  
pp. 2168-2178 ◽  
Author(s):  
Aniruddha Ganguly ◽  
Soumen Ghosh ◽  
Nikhil Guchhait
Keyword(s):  
Ionic Strength ◽  
Bile Salt ◽  
Fluorescent Probe ◽  
Aggregation Behavior ◽  
Binding Interactions ◽  
Binding Behavior

Binding interactions of an anthracene-based fluorescent probe with a series of bile-salt aggregates of varying hydrophobicity, as well as salt induced alterations of the binding behavior have been thoroughly demonstrated.

Aggregation behavior and reactivity of hydrophobic vitamin B12 covalently bound to lipid in aqueous media

1993 ◽  
Vol 34 (5) ◽  
pp. 863-866 ◽  
Author(s):  
Yukito Murakami ◽  
Yoshio Hisaeda ◽  
Akihiro Ogawa ◽  
Tetsuya Miyajima ◽  
Osamu Hayashida ◽  
...  
Keyword(s):  
Vitamin B12 ◽  
Aqueous Media ◽  
Aggregation Behavior ◽  
Covalently Bound

PNIPAM-based heteroarm star-graft quarterpolymers: synthesis, characterization and pH-dependent thermoresponsiveness in aqueous media

2015 ◽  
Vol 6 (21) ◽  
pp. 3942-3955 ◽  
Author(s):  
Zacharoula Iatridi ◽  
M. M. Soledad Lencina ◽  
Constantinos Tsitsilianis
Keyword(s):  
Ionic Strength ◽  
Aqueous Media ◽  
Grafting Density ◽  
Ph Dependent

We report the design of PSn(P2VP-b-PAA-g-PNIPAM)n heteroarm star-graft quarterpolymers, the thermoresponsiveness of which is strongly dependent on pH ionic strength, and their macromolecular features, e.g. arm number and grafting density.

scholarly journals Marble Waste Sludges as Effective Nanomaterials for Cu (II) Adsorption in Aqueous Media

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2305
Author(s):  
Ventura Castillo Ramos ◽  
José Rivera Utrilla ◽  
Antonio Ruiz Sánchez ◽  
María Victoria López Ramón ◽  
Manuel Sánchez Polo
Keyword(s):  
Ionic Strength ◽  
Aqueous Medium ◽  
Aqueous Media ◽  
Real Life ◽  
Intraparticle Diffusion ◽  
Surface Complexes ◽  
X Ray ◽  
Adsorption Sites ◽  
Life Conditions ◽  
Marble Waste

This study evaluated the waste generated by a Spanish marble-producing company as adsorbent for the removal of copper (Cu [II]) from aqueous media. Six marble waste sludge samples were studied, and the following operational parameters were analyzed in discontinuous regime, including pollutant concentration, pH, temperature, nature of aqueous medium, and ionic strength. The applicability of the adsorbent material was assessed with experiments in both continuous and discontinuous regimes under close-to-real-life conditions. A pseudo-second order model yielded a better fit to the kinetic data. Application of the intraparticle diffusion model revealed two well-differentiated adsorption stages, in which the external material transfer is negligible and intraparticle diffusion is the controlling stage. The equilibrium study was better fitted to a Freundlich-type isotherm, predicting elevated maximum adsorption values (22.7 mg g−1) at a relatively low initial Cu (II) concentration (25 ppm), yielding a highly favorable chemisorption process (n >> 1). X-ray fluorescence study identified calcite (CaCO3) as the main component of marble waste sludges. According to X-ray diffraction analysis, Cu (II) ion adsorption occurred by intercalation of the metallic cation between CaCO3 layers and by the formation of surface complexes such as CaCO3 and Cu2(CO3)(OH)2. Cu (II) was more effectively removed at medium pH, lower temperature, and lower ionic strength of the aqueous medium. The salinity and dissolved organic matter in surface, ground-, and waste-waters negatively affected the Cu (II) removal process in both continuous and discontinuous regimes by competing for active adsorption sites. These findings demonstrate the applicability and effectiveness of marble-derived waste sludges as low-cost and readily available adsorbents for the treatment of waters polluted by Cu (II) under close-to-real-life conditions.

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