scholarly journals Preparation of Lignosulfonates from Biorefinery Lignins by Sulfomethylation and Their Application as a Water Reducer for Concrete

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 841 ◽  
Author(s):  
Caoxing Huang ◽  
Junmei Ma ◽  
Weiyu Zhang ◽  
Guohong Huang ◽  
Qiang Yong
Keyword(s):  
Surface Tension ◽  
Compressive Strength ◽  
Enzymatic Hydrolysis ◽  
Zeta Potential ◽  
Water Soluble ◽  
Water Soluble Polymer ◽  
Potential Analysis ◽  
Hydrolysis Residue ◽  
Industrial Standards ◽  
Zeta Potential Analysis

Lignosulfonate (LG), a water-soluble polymer from sulfite pulping process of lignocellulosic biomass, has been commercially applied as admixture for concrete. In this work, lignosulfonates were produced from alkaline lignin (AL) and enzymatic hydrolysis residue (EHR) by sulfomethylation and these lignosulfonates as water reducers for concrete were then evaluated. Results showed that 94.9% and 68.9% of lignins in AL and EHR could be sulfonated under optimum sulfomethylation conditions, respectively. The sulfonic groups in lignosulfonates from AL (AL-LG) and EHR (EHR-LG) were 1.6 mmol/g and 1.0 mmol/g, respectively. Surface tension and zeta potential analysis indicated that both AL-LG and EHR-LG can be potentially used to as dispersant for improving the fluidity of the cement paste, similarly to commercial lignosulfonate (CM-LG). Adding 0.2 wt % of AL-LG, EHR-LG, and CM-LG in the concrete, the compressive strength (28 days) of concretes increased from 38.4 Mpa to 41.6, 42.6, and 40.9 Mpa, respectively. These findings suggest that the lignosulfonate from biorefinery lignin by sulfomethylation can meet the industrial standards as water reducers for cement admixtures.

Preparation of Nanoparticles by Crosslinking Folate Conjugated Chitosan with Vanillin and its Characterization

2012 ◽  
Vol 466-467 ◽  
pp. 454-457 ◽  
Author(s):  
Min Zhou ◽  
Pu Wang Li ◽  
Guang Wang ◽  
Zi Ming Yang ◽  
Zheng Peng ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Zeta Potential ◽  
Cross Linking ◽  
Cooh Group ◽  
Potential Analysis ◽  
Emulsion Method ◽  
Ft Ir ◽  
Schiff Reaction ◽  
Zeta Potential Analysis ◽  
Scanning Electron

Functionalized chitosan (CS) were widely used as drug delivery system in the chemotherapy of various disease. In this work, folate (FA) was conjugated into chitosan molecular as targeting ligand based on Schiff reaction between –NH2 group of CS and –COOH group of FA. And nanoparticles were made by emulsion method with vanillin novel cross-linking agent. The FA modified CS and its nanoparticles were characterized by Fourier transform spectroscopy (FT-IR), scanning electron microscope (SEM) and Zeta potential. SEM results confirmed the nanoparticles made from FA-CS conjugate were spherical in shape and were about 100 nm in size. Zeta potential analysis revealed that the nanoparticles were negatively charged with charge density of -7.73mV.

Zeta Potential (?) Analysis for the Determination of Protein Content in Rice Flour

2005 ◽  
Vol 57 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Rungtiwa Wongsagonsup ◽  
Sujin Shobsngob ◽  
Bovornlak Oonkhanond ◽  
Saiyavit Varavinit
Keyword(s):  
Zeta Potential ◽  
Protein Content ◽  
Rice Flour ◽  
Potential Analysis ◽  
Zeta Potential Analysis

Etherifying Modification of Xylan-Type Hemicellulose and its Characterization

2013 ◽  
Vol 821-822 ◽  
pp. 1060-1064
Author(s):  
Hai Ming Li ◽  
Xiao Hong Chen ◽  
Jing Hui Zhou ◽  
Ying Han ◽  
Guang Wei Sun
Keyword(s):  
Zeta Potential ◽  
Charge Density ◽  
Spectroscopic Analysis ◽  
Water Soluble ◽  
Infrared Spectroscopic Analysis ◽  
One Step ◽  
Density Analysis ◽  
Ft Ir ◽  
Zeta Potential Analysis ◽  
Thermal Stability Of

The reaction of the xylan-type hemicellulose with 2,3-epoxypropyltrimethylammonium chloride and acrylamide in ethanol-water-alkali slurry yielded water-soluble, cationic etherified xylan-type hemicellulose derivatives. The degree of substitution (DS) value reaches up to 0.40 by adjusting the mass ratios (NaOH/hemicellulose, total etherifying agents/hemicellulose and 2,3-epoxypropyltrimethylammonium chloride/acrylamide), the reaction temperature and the reaction time in a one-step synthesis. The etherified hemicellulose was characterized by infrared spectroscopic analysis (FT-IR), Zeta potential analysis, charge density analysis and thermogravimetric analysis (TGA). It is found that Zeta potential is promoted from-30.50mv to +35.81mv and charge density is promoted from-0.50mmol/g to +0.88mmol/g during etherification under the conditions used. The thermal stability of the etherified hemicellulose is lower than that of the unmodified xylan-type hemicellulose polymers.

scholarly journals Partially Acetylated Cellulose Dissolved in Aqueous Solution: Physical Properties and Enzymatic Hydrolysis

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1734 ◽  
Author(s):  
Alfassi ◽  
Rein ◽  
Shpigelman ◽  
Cohen
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Enzymatic Hydrolysis ◽  
Cellulose Acetate ◽  
Persistence Length ◽  
Water Soluble ◽  
High Rate ◽  
Cellulose Derivatives ◽  
Molecular Aggregation ◽  
Cellulose Dissolution

Cellulose acetate is one of the most important cellulose derivatives. The use of ionic liquids in cellulose processing was recently found to act both as a solvent and also as a reagent. A recent study showed that cellulose dissolution in the ionic liquid 1-ethyl-3-methylimidazoliumacetate (EMIMAc) mixed with dichloromethane (DCM) resulted in controlled homogenous cellulose acetylation; yielding water-soluble cellulose acetate (WSCA). This research investigated the properties of cellulose acetate prepared in this manner, in an aqueous solution. The results revealed that WSCA fully dissolves in water, with no significant sign of molecular aggregation. Its conformation in aqueous solution exhibited a very large persistence length, estimated as over 10 nm. The WSCA exhibited surface activity, significantly reducing the surface tension of water. Because of the molecular dissolution of WSCA in water, augmented by its amphiphilicity, aqueous solutions of WSCA exhibited an overwhelmingly high rate of enzymatic hydrolysis.

Zeta potential analysis of coagulation and biofiltration of water supply

1998 ◽  
Vol 33 (5) ◽  
pp. 715-727
Author(s):  
X.H. Zhang ◽  
W.J. Liu ◽  
Z.S. Wang ◽  
X.L. Dong ◽  
J.H. Lü ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Water Supply ◽  
Potential Analysis ◽  
Zeta Potential Analysis

Effect of Zeta Potential of Stanum Oxide (SnO2) on Electrophoretic Deposition (EPD) on Porous Alumina

2013 ◽  
Vol 795 ◽  
pp. 334-337 ◽  
Author(s):  
Siti Alwani Binti Ab. Aziz ◽  
Shahrin Hisham Amirnordin ◽  
Hamimah A. Rahman ◽  
Hasan Zuhudi Abdullah ◽  
Hariati Taib
Keyword(s):  
Zeta Potential ◽  
Electrophoretic Deposition ◽  
Porous Alumina ◽  
Potential Analysis ◽  
Aqueous Suspensions ◽  
Zeta Potential Analysis

Zeta potential analysis of stanum oxide (SnO2) aqueous suspensions (pH7 to pH11) was performed prior to the electrophoretic deposition (EPD) of SnO2. Deposition of SnO2on porous alumina was obtained by applying the EPD technique carried out by applying voltage of 18V for duration of four minutes. It was found that the depositions SnO2suspended at pH 7 to pH 11 were successful. The relation between the SnO2deposition with SnO2pH and zeta potential values was established in which increased value of pH causes decreased value of zeta potential and decreased SnO2deposition through EPD technique.

Comparative Study on the Treatment of Berberine Wastewater by Chemical- and Electro-Coagulation Processes: Zeta Potential Analysis

2012 ◽  
Vol 599 ◽  
pp. 496-500 ◽  
Author(s):  
Shu Hu Xiao ◽  
Yong Hui Song ◽  
Ping Zeng ◽  
Jian Feng Peng ◽  
Dong Sheng Zhang
Keyword(s):  
Zeta Potential ◽  
Comparative Study ◽  
Pharmaceutical Wastewater ◽  
Chemical Coagulation ◽  
Potential Analysis ◽  
Removal Efficiencies ◽  
Berberine Wastewater ◽  
Electro Coagulation ◽  
The Comparative Study ◽  
Zeta Potential Analysis

The comparative study on treating the berberine pharmaceutical wastewater by chemical-coagulation and electro-coagulation was carried out, and the Zeta potential, ζ was analyzed to reveal the coagulation mechanisms. The results indicated that electro-coagulation and pulse electro-coagulation could be more effective than traditional chemical-coagulation for berberine removal from wastewater: the removal efficiencies of electro-coagulation and pulse electro-coagulation processes reached above 87.6%, while the removal efficiencies were lower than 35% for the PFS and PAC coagulations. The ζ potential analysis revealed that charge neutralization was the main mechanisms for berberine removal.

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