scholarly journals Wettability of a Polymethylmethacrylate Surface by Extended Anionic Surfactants: Effect of Branched Chains

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 863
Author(s):  
Qin Jiang ◽  
Yuechun Du ◽  
Lei Zhang ◽  
Wangjing Ma ◽  
Feng Yan ◽  
...  
Keyword(s):  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Contact Angles ◽  
Liquid Interface ◽  
Adsorption Parameters ◽  
Extended Surfactant ◽  
Hydrophilic Modification ◽  
Pmma Surface ◽  
High Concentrations ◽  
Branched Chains

The adsorption behaviors of extended anionic surfactants linear sodium dodecyl(polyoxyisopropene)4 sulfate (L-C12PO4S), branched sodium dodecyl(polyoxyisopropene)4 sulfate (G-C12PO4S), and branched sodium hexadecyl(polyoxyisopropene)4 sulfate (G-C16PO4S) on polymethylmethacrylate (PMMA) surface have been studied. The effect of branched alkyl chain on the wettability of the PMMA surface has been explored. To obtain the adsorption parameters such as the adhesional tension and PMMA-solution interfacial tension, the surface tension and contact angles were measured. The experimental results demonstrate that the special properties of polyoxypropene (PO) groups improve the polar interactions and allow the extended surfactant molecules to gradually adsorb on the PMMA surface by polar heads. Therefore, the hydrophobic chains will point to water and the solid surface is modified to be hydrophobic. Besides, the adsorption amounts of the three extended anionic surfactants at the PMMA–liquid interface are all about 1/3 of those at the air–liquid interface before the critical micelle concentration (CMC). However, these extended surfactants will transform their original adsorption behavior after CMC. The surfactant molecules will interact with the PMMA surface with the hydrophilic heads towards water and are prone to form aggregations at the PMMA–liquid interface. Therefore, the PMMA surface will be more hydrophilic after CMC. In the three surfactants, the branched G-C16PO4S with two long alkyl chains exhibits the strongest hydrophobic modification capacity. The linear L-C12PO4S is more likely to densely adsorb at the PMMA–liquid interface than the branched surfactants, thus L-C12PO4S possesses the strongest hydrophilic modification ability and shows smaller contact angles on PMMA surface at high concentrations.

Utility of dodecyl sulfate surfactants as dissolution inhibitors in chemical mechanical planarization of copper

2005 ◽  
Vol 20 (12) ◽  
pp. 3413-3424 ◽  
Author(s):  
Y. Hong ◽  
U.B. Patri ◽  
S. Ramakrishnan ◽  
D. Roy ◽  
S.V. Babu
Keyword(s):  
Material Removal ◽  
Anionic Surfactants ◽  
Chemical Mechanical Planarization ◽  
Sodium Dodecyl ◽  
Contact Angles ◽  
Open Circuit ◽  
Environmentally Benign ◽  
Chemical Dissolution ◽  
Dodecyl Sulfate ◽  
Cu Cmp

An important component of the slurries used in chemical mechanical planarization (CMP) is an appropriately chosen corrosion/dissolution inhibitor, which facilitates selective material removal from protrusions while protecting recessed regions of the surface. The present work demonstrates the utility of two environmentally benign anionic surfactants, sodium dodecyl sulfate (SDS) and ammonium dodecyl sulfate (ADS) as dissolution inhibitors. Using a standard slurry (1 wt% glycine with 5 wt% H2O2 at pH = 4.0) typically used for Cu CMP and combining measurements of open circuit potentials and contact angles with those of Cu removal rates, we show that both SDS and ADS suppress chemical dissolution and polish rates of Cu. The dissolution inhibition efficiencies of ADS and SDS measured in these experiments are found to be superior to those of benzotriazole (BTA), a traditional inhibiting agent used for copper CMP.

Hydrophobisation of mechanical pulp fibres with sodium dodecyl sulphate functionalised layered double hydroxide particles

Holzforschung ◽  
2012 ◽  
Vol 66 (4) ◽  
Author(s):  
Carl Lange ◽  
Tom Lundin ◽  
Pedro Fardim
Keyword(s):  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Weight Ratio ◽  
Hydrophobic Surface ◽  
Fibre Surface ◽  
Contact Angle Measurement ◽  
Contact Angles ◽  
Angle Measurement ◽  
Mechanical Pulp ◽  
Pulp Fibres

Abstract Hydrogen peroxide bleached spruce (Picea abies L.) made of thermo mechanical pulp (BTMP) fibres were modified with layered double hydroxides (LDH). The LDH particles were precipitated onto the BTMP fibre surfaces from aqueous solutions of urea and NaOH. The modified BTMP was further functionalised with sodium dodecyl sulphate (SDS) surfactant to produce pulp with hydrophobic character. The contact angle measurement with water on paper showed that the functionalisation with SDS was successful. The apparent contact angles varied in between the initial θ= 75° of the reference pulp up to θ= 135° of the SDS functionalised pulp. A hydrophobic surface was obtained already with 2.0% weight to weight ratio of SDS in pulp suspension. A high affinity between the LDH particles and the BTMP fibres was found as well. The investigated fibre modification route offers a new feasible tool in fibre surface treatment.

scholarly journals INFLUENCE OF PROBIOTIC PRODUCTS ON THE QUALITY OF WASTE WATER TREATMENT IN DAIRY INDUSTRIES

2020 ◽  
Vol 10 (1) ◽  
pp. 47-55
Author(s):  
Elena I. VIALKOVA ◽  
Olga V. SIDORENKO ◽  
Ekaterina S. GLUSHENKO
Keyword(s):  
Anionic Surfactants ◽  
Waste Water Treatment ◽  
Local Treatment ◽  
Dairy Industry ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Industrial Wastewaters ◽  
High Concentrations ◽  
The Impact

Nowadays there is the problem of the effective treatment of dairy industry plants’ wastewaters. Industrial wastewaters of these plants have high concentrations of organic matters and differ significantly from domestic wastewaters. The method of intensification of dairy wastewaters treatment in Tyumen region, using probiotic «PIP Plus WATER» (Belgium) is considered in this article. The article presents the results of conducted research on the impact of the probiotic on such wastewaters indices as pH, chemical oxygen demand, anionic surfactants, ammonium, nitrites, nitrates and phosphates concentrations. The comparison among different ways of wastewater treatment with probiotics has been made. Based on obtained results technological scheme of local treatment plant of dairy industry plant has been suggested.

scholarly journals Mechanism of neutrophil chemiluminescence induced by wheat germ agglutinin: partial characterization of the antigens recognized by wheat germ agglutinin

Blood ◽  
1984 ◽  
Vol 64 (5) ◽  
pp. 1094-1102 ◽  
Author(s):  
Y Ozaki ◽  
J Iwata ◽  
T Ohashi
Keyword(s):  
Membrane Proteins ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Sodium Dodecyl ◽  
Submaxillary Gland ◽  
Binding Property ◽  
Molecular Weights ◽  
Acetylneuraminic Acid ◽  
Cell Extracts ◽  
High Concentrations

Abstract Wheat germ agglutinin (WGA) stimulated neutrophils to produce significant levels of luminol-dependent chemiluminescence (CL). Since WGA is known to bind N-acetylglucosamine (GlcNAc) oligomers and N- acetylneuraminic acid (NANA), we attempted to determine which binding property of WGA is essential for induction of CL. The succinylated form of WGA (SuWGA), which is no longer able to bind NANA, was still able to induce CL. N-Acetylglucosamine at a concentration of 20 mmol/L almost completely inhibited WGA-induced CL production by neutrophils, whereas bovine submaxillary gland mucin, a potent blocker of NANA binding of WGA, failed to inhibit CL production. Lectins with the GlcNAc-binding property were examined for their ability to induce CL. Those that have higher valences and have a tendency to bind GlcNAc oligomers in the internal portion of glycoconjugates were able to induce CL, whereas those that have low valences and bind terminal GlcNAc of glycoconjugates failed to induce CL even at high concentrations. Attempts were made to characterize the neutrophil membrane proteins recognized by WGA. Glycoproteins with a molecular weight of 25,000 daltons were identified by a 50 mmol/L GlcNAc elution of WGA gels loaded with 125I-labeled neutrophil membrane proteins. Elution with 500 mumol/L GlcNAc trimer produced several glycoproteins of different molecular weights in addition to the glycoproteins of 25,000 daltons. 125I-labeled WGA and SuWGA were used for autoradiographic analysis of cell extracts of the neutrophils separated on sodium dodecyl sulfate polyacrylamide gels. WGA recognized multiple glycoproteins of different molecular weights, whereas SuWGA bound only a few of them. Glycoproteins of 25,000 daltons, probably corresponding to those identified by 50 mmol/L GlcNAc elution, were also recognized.

scholarly journals Purification and properties of l-3-glycerophosphate dehydrogenase from pig brain mitochondria

1980 ◽  
Vol 192 (1) ◽  
pp. 9-18 ◽  
Author(s):  
I R Cottingham ◽  
C I Ragan
Keyword(s):  
Isoelectric Focusing ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Brain Mitochondria ◽  
Exchange Chromatography ◽  
Glycerophosphate Dehydrogenase ◽  
Pig Brain ◽  
Purification And Properties ◽  
High Concentrations ◽  
Triton X

L-3-Glycerophosphate dehydrogenase (EC 1.1.99.5) was purified from pig brain mitochondria by extraction with deoxycholate, ion-exchange chromatography and (NH4)2SO4 fractionation in cholate, and preparative isoelectric focusing in Triton X-100. Sodium dodecyl sulphate/polyacrylamide gel electrophoresis shows that the purified enzyme consists of a single subunit of mol.wt. 75 000. The enzyme contains non-covalently bound FAD and low concentrations of iron and acid labile sulphide. No substrate reducible e.p.r. signals were detected. The conditions of purification, particularly the isoelectric focusing step, lead to considerable loss of FAD and possibly iron-sulphur centres. It is therefore not possible to decide with certainty whether the enzyme is a flavoprotein or a ferroflavoprotein. The enzyme catalyses the oxidation of L-3-glycerophosphate by a variety of electron acceptors, including ubiquinone analogues. A number if compounds known to inhibit ubiquinone oxidoreduction by other enzymes of the respiratory chain failed to inhibit L-3-glycerophosphate dehydrogenase, except at very high concentrations.

scholarly journals Use of Viscosity to Probe the Interaction of Anionic Surfactants with a Coagulant Protein from Moringa oleifera Seeds

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Raymond Maikokera ◽  
Habauka M. Kwaambwa
Keyword(s):  
Moringa Oleifera ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Protein Solutions ◽  
Capillary Viscometer ◽  
Protein Solution ◽  
V Protein ◽  
Dodecyl Benzene Sulfonate ◽  
Physical Quantities

The intrinsic viscosity of the coagulant protein was evaluated from the flow times of the protein solutions through a capillary viscometer, and the results suggested the coagulant protein to be globular. The interactions of the coagulant protein with anionic surfactant sodium dodecyl sulphate (SDS) and sodium dodecyl benzene sulfonate (SDBS) were also investigated by capillary viscometry. We conclude that there is strong protein-surfactant interaction at very low surfactant concentrations, and the behavior of the anionic surfactants in solutions containing coagulant protein is very similar. The viscometry results of protein-SDS system are compared with surface tension, fluorescence, and circular dichroism reported earlier. Combining the results of the four studies, the four approaches seem to confirm the same picture of the coagulant protein-SDS interaction. All the physical quantities when studied as function of surfactant concentration for 0.05% (w/v) protein solution either exhibited a maximum or minimum at a critical SDS concentration.

scholarly journals Performance and Biomass Characteristics of SBRs Treating High-Salinity Wastewater at Presence of Anionic Surfactants

2020 ◽  
Vol 17 (8) ◽  
pp. 2689 ◽  
Author(s):  
Huiru Li ◽  
Shaohua Wu ◽  
Chunping Yang
Keyword(s):  
Extracellular Polymeric Substances ◽  
High Salinity ◽  
Anionic Surfactants ◽  
Sodium Dodecyl ◽  
Ammonia Nitrogen ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Batch Reactors ◽  
Sequencing Analysis ◽  
Sequencing Batch Reactors ◽  
Improper Use

Sodium dodecylbenzene sulfonate (SDBS) and sodium dodecyl sulfate (SDS), as two anionic surfactants, have diffused into environments such as surface water and ground water due to extensive and improper use. The effects on the removal performance and microbial community of sequencing batch reactors (SBRs) need to be investigated in the treatment of saline wastewater containing 20 g/L NaCl. The presence of SDS and SDBS could decrease the removal efficiencies of ammonia nitrogen and total phosphorus, and the effect of SDS was more significant. The effect of surfactants on the removal mainly occurred during the aeration phase. Adding SDS and SDBS can reduce the content of extracellular polymeric substances (EPS). In addition, SDS and SDBS also can reduce the inhibition of high salinity on sludge activity. A total of 16 s of rRNA sequencing analysis showed that the addition of surfactants reduced the diversity of microbial communities; besides, the relative abundance value of the dominant population Proteobacteria increased from 91.66% to 97.12% and 93.48% when SDS and SDBS were added into the system, respectively.

scholarly journals Adsorption Parameters and Surface Species in the Nickel—Molybdenum Alumina System

1989 ◽  
Vol 6 (4) ◽  
pp. 192-211 ◽  
Author(s):  
R.A.E. Rodriguez ◽  
G.J. Siri ◽  
C.V. Cáceres ◽  
H.J. Thomas
Keyword(s):  
Nickel Content ◽  
Catalyst System ◽  
Atomic Ratio ◽  
Convincing Evidence ◽  
Intrinsic Activity ◽  
Adsorption Parameters ◽  
Low Concentrations ◽  
Thiophene Conversion ◽  
High Concentrations ◽  
Molybdenum Concentration

Isotherms corresponding to the adsorption of ammonium heptamolybdate solutions on nickel–alumina supports have been studied. Such isotherms exhibit two distinct adsorption regions, with both the support and the adsorbed species contributing to their formation. Two types of site are available for adsorption on the support and, depending on the molybdenum concentration present in solution, either monomeric (at low concentrations) or polymeric molybdenum species (at high concentrations) are formed and adsorbed. Monomer adsorption occurs at low concentrations, whereas polyanion adsorption predominates at high concentrations; the latter is reflected in an abrupt increase in molybdenum concentration adsorbed on the support. The adsorption isotherms measured at 20°C and 50°C, and TPR and XPS studies indicate that the samples prepared at 50°C contain a lower quantity of octahedral molybdenum, although dispersion of the molybdenum on the surface is higher. In addition, a direct relationship exists between the dispersion of the active component and the hydrodesulphurization activity of the sample. The presence of nickel on the support does not affect the total number of sites occupied by molybdenum. However, when the nickel content on the solid is increased, the molybdenum species occupy a higher proportion of octahedral sites. XPS studies have shown that samples with a higher nickel content possess a better dispersion of molybdenum species and exhibit a higher intrinsic activity. Enhanced molybdenum dispersion and thiophene conversion was associated with samples in which molybdenum adsorption occurred before nickel impregnation. For all the series studies, the maximum value in the intrinsic acitivity occurred at the same value of the Ni/Mo atomic ratio. This provides convincing evidence that the precursor ratio is important in this catalyst system.

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