Study on the Colloid Chemistry Behavior in Domestic Old Book Paper (DOBP) Deinking System

2011 ◽  
Vol 236-238 ◽  
pp. 1463-1466
Author(s):  
Xiao Lin Zhang ◽  
Qing Han
Keyword(s):  
Surface Tension ◽  
Zeta Potential ◽  
Removal Efficiency ◽  
Colloid Chemistry ◽  
Chemical Behavior

In this paper, the domestic old book paper(DOBP) was subjected to deinking process. Surface and colloid characterisitics of DOBP deinking pulp(DIP) system was investigated. The relation between surface and colloid characterisitic changes and efficiency of deinking (brightness and residual ink particles content) was studied. Technical conditions that affect the deinking pulp’s colloid chemical behavior were also analyzed here.The results showed that colloid-chemical behavior of DOBP deinking system could be changed during the deinking process. The colloid-chemical behavior, such as Zeta potential and surface tention, had a certain corresponding relation with deinking efficiency of DOBP deinking system. When Zeta potential of the deinking system was more great, and surface tension was more low in a certain range(Zeta potential was -17.0~ -16.0mV and surface tension was 59.0~61.0mN/m), brightness and ink removal efficiency of DOBP will be improved.

scholarly journals New Opportunity to Formulate Intranasal Vaccines and Drug Delivery Systems Based on Chitosan

2020 ◽  
Vol 21 (14) ◽  
pp. 5016
Author(s):  
Roxana Popescu ◽  
Mihaela Violeta Ghica ◽  
Cristina-Elena Dinu-Pîrvu ◽  
Valentina Anuța ◽  
Dumitru Lupuliasa ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Surface Tension ◽  
Zeta Potential ◽  
Conformational Changes ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Active Pharmaceutical Ingredients ◽  
Nasal Drug Delivery ◽  
Pharmaceutical Ingredients ◽  
Permeability Enhancement

In an attempt to develop drug delivery systems that bypass the blood–brain barrier (BBB) and prevent liver and intestinal degradation, it was concluded that nasal medication meets these criteria and can be used for drugs that have these drawbacks. The aim of this review is to present the influence of the properties of chitosan and its derivatives (mucoadhesion, permeability enhancement, surface tension, and zeta potential) on the development of suitable nasal drug delivery systems and on the nasal bioavailability of various active pharmaceutical ingredients. Interactions between chitosan and proteins, lipids, antigens, and other molecules lead to complexes that have their own applications or to changing characteristics of the substances involved in the bond (conformational changes, increased stability or solubility, etc.). Chitosan and its derivatives have their own actions (antibacterial, antifungal, immunostimulant, antioxidant, etc.) and can be used as such or in combination with other molecules from the same class to achieve a synergistic effect. The applicability of the properties is set out in the second part of the paper, where nasal formulations based on chitosan are described (vaccines, hydrogels, nanoparticles, nanostructured lipid carriers (NLC), powders, emulsions, etc.).

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.

Hydrophobicity, surface tension, and zeta potential measurements of glass-reinforced hydroxyapatite composites

1999 ◽  
Vol 45 (4) ◽  
pp. 370-375 ◽  
Author(s):  
M. A. Lopes ◽  
F. J. Monteiro ◽  
J. D. Santos ◽  
A. P. Serro ◽  
B. Saramago
Keyword(s):  
Surface Tension ◽  
Zeta Potential

Investigation on the Effect of an Divalent Electrolyte on the Flocculation of SDBS with Al3+

2012 ◽  
Vol 610-613 ◽  
pp. 163-168
Author(s):  
Jie Yan ◽  
Dong Wang ◽  
Fei Fei Yang ◽  
Dong Mei Yao
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Zeta Potential ◽  
Anionic Surfactant ◽  
Potential Surface ◽  
Sodium Dodecylbenzenesulfonate ◽  
Molar Ratios ◽  
Ph Values ◽  
Average Size

The effect of an divalent electrolyte Ca2+ on the flocculation of two different concentrations of anionic surfactant Sodium Dodecylbenzenesulfonate (SDBS) with Al3+ has been investigated at different molar ratios Al3+ to SDBS at 298.15 K. The results showed that the flocculation characteristics of 0.01 mol•L-1 SDBS (above the critical micelle concentration CMC) and 0.001 mol•L-1 SDBS (below the CMC) were obviously different with an increase of dosages of Al3+. The z-average size of flocculate of 0.01 mol•L-1 SDBS with Al3+ decreased particularly with the pre-addition of Ca2+，It suggested the formation of the complexion Ca(SDBS)2. At optimization flocculation areas at 298.15K, pH values were all around 3.5 in the flocculation systems SDBS/Al3+ and Ca2+/SDBS/Al3+ whether the SDBS concentration above or below the CMC. The pre-addition of Ca2+ slightly affected other flocculation parameters of SDBS/Al3+ systems such as zeta potential, surface tension, conductivity and pH.

scholarly journals Surface electrostatics govern the emulsion stability of biomolecular condensates

2020 ◽  
Author(s):  
Timothy J. Welsh ◽  
Georg Krainer ◽  
Jorge R. Espinosa ◽  
Jerelle A. Joseph ◽  
Akshay Sridhar ◽  
...  
Keyword(s):  
Surface Tension ◽  
Phase Separation ◽  
Liquid Phase ◽  
Zeta Potential ◽  
Molecular Modelling ◽  
Emulsion Stability ◽  
Zeta Potentials ◽  
Molecular Determinants ◽  
Repulsive Forces ◽  
Liquid Liquid Phase Separation

AbstractLiquid–liquid phase separation underlies the formation of biological condensates. Physically, such systems are microemulsions which have a general propensity to fuse and coalesce; however, many condensates persist as independent droplets inside cells. This stability is crucial for their functioning, but the physicochemical mechanisms that control the emulsion stability of condensates remain poorly understood. Here, by combining single-condensate zeta potential measurements, optical microscopy, tweezer experiments, and multiscale molecular modelling, we investigate how the forces that sustain condensates impact their stability against fusion. By comparing PR25:PolyU and FUS condensates, we show that a higher condensate surface charge correlates with a lower fusion propensity, and that this behavior can be inferred from their zeta potentials. We reveal that overall stabilization against fusion stems from a combination of repulsive forces between condensates and the effects that surface electrostatics have on lowering surface tension, thus shedding light on the molecular determinants of condensate coalescence.

Effects of Wettability and Zeta Potential of Filter Medium on Oil Removal

2010 ◽  
Vol 148-149 ◽  
pp. 58-70
Author(s):  
Qing Chang ◽  
Bin Wu Yang ◽  
Bi Gui Wei
Keyword(s):  
Zeta Potential ◽  
Removal Efficiency ◽  
Capillary Rise ◽  
Streaming Potential ◽  
Filter Medium ◽  
Oil Removal ◽  
Filter Media ◽  
Zeta Potentials ◽  
Removal Efficiencies

The methods and devices which can be used to determine the wettability and zeta potential of filter medium were developed according to the principles of capillary rise and streaming potential respectively. Lipophilic Hydrophilic Ratio (LHR) was defined based on Washburn equation. LHR values and zeta potentials of some conmen filter media were measured respectively, and the oil removal efficiencies of these filter media were also tested. The result shows that the effect of wettability on oil removal efficiency is much greater than that of zeta potential in conmen condition. The oil removal efficiency mainly depends on LHR value of filter medium, not on zeta potential of filter medium.

Synthesis of Model Alumina Slurries for Damascene Patterning of Copper

2001 ◽  
Vol 671 ◽  
Author(s):  
Byung-Chan Lee ◽  
David J. Duquette ◽  
Ronald J. Gutmann
Keyword(s):  
Surface Tension ◽  
Zeta Potential ◽  
Defect Density ◽  
Potassium Dichromate ◽  
Chemical Mechanical Planarization ◽  
Open Circuit ◽  
Potential Measurement ◽  
Nominal Size ◽  
Patterned Structures ◽  
Defect Densities

ABSTRACTModel alumina slurries for chemical-mechanical planarization (CMP) of copper have been studied using fundamental electrochemical concepts together with modification of surface tension and zeta-potential. A model slurry was established containing 3 wt% alumina (50 nm nominal size), 2 wt% potassium dichromate (K2Cr2O7) and 1 vol % DOWFAX, as abrasive, oxidizer and anionic surfactant, respectively, which resulted in blanket copper removal rates of 130 nm/min with smooth, low-particulate defect density surfaces without aggressive post-CMP cleaning. When used with a model silica-abrasive slurry to remove the Ta liner, well-defined damascene-patterned structures were achieved with low-particulate defect densities.Open circuit potential measurement, potentiodynamic polarization, surface tension measurement, and zeta-potential measurement were used in developing the model slurries. The variations obtained with alternative abrasives, alternative oxidizers and alternative surfactants illustrate the principles of synthesizing slurries for Cu and Ta.

Graphene Oxide for Ink-Jet Printing Technology

2015 ◽  
Vol 748 ◽  
pp. 77-80 ◽  
Author(s):  
Ya Ling Li ◽  
Xi Guo ◽  
Xiao Juan Feng ◽  
Lu Hai Li
Keyword(s):  
Surface Tension ◽  
Graphene Oxide ◽  
Zeta Potential ◽  
Inkjet Printing ◽  
Laser Scanning Microscopy ◽  
Average Particle ◽  
Printing Technology ◽  
Ink Jet Printing ◽  
Ink Jet ◽  
Jet Printing

In order to acquire a suitable ink for ink-jet printing technology, a graphene oxide ink was explored based on the GO aqueous dispersion. The GO dispersion was characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The average particle diameter and zeta potential of the GO dispersion was determined by zeta potential & particle size analyzer. The GO ink is composed of 1,2-propanediol, diethylene glycol monobutyl ether, glycerol, polyvinyl pyrrolidone (PVP) and GO dispersion. The surface tension and viscosity of the GO ink was tested by surface tension meter and rheometer. The GO ink was inkjet printed on polyethylene terephthalate (PET) substrate. The optimal inkjet printing parameters were obtained and the printing quality was characterized by confocal laser scanning microscopy. The results show that the GO ink is suitable for inkjet printing technology and the morphology of the GO film with one printing pass has good uniformity.

scholarly journals Effect of Ether Mono Amine Collector on the Cationic Flotation of Micaceous Minerals—A Comparative Study

2021 ◽  
Vol 13 (19) ◽  
pp. 11066
Author(s):  
Arash Tohry ◽  
Reza Dehghan ◽  
Hossein Mohammadi-Manesh ◽  
Laurindo de Salles Leal Filho ◽  
Saeed Chehreh Chelgani
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Zeta Potential ◽  
Iron Oxides ◽  
Layer Structure ◽  
Physical Adsorption ◽  
Reverse Flotation ◽  
Flotation Process ◽  
Adsorption Behaviors ◽  
Wide Range

Micaceous minerals, known as layer silicates, are counted mostly as the gangue minerals associated with valuable minerals, especially iron oxides. They mainly reject through the reverse flotation process using the cationic collectors, e.g., ether amines, to improve process sustainability. Although ether amines have been applied for floating the wide range of silicates, few investigations explored their adsorption behaviors on the micaceous minerals. In this study, flotation of phlogopite, biotite, and quartz (for comparison purposes) in the presence of Flotigam®EDA (EDA) (commercial ether monoamine collector), at pH 10 was investigated through the single mineral micro–flotation experiments. Adsorption behaviors were explored by the contact angle, residual surface tension measurements, and zeta potential analyses. Micro–flotation outcomes indicated that the quartz floatability was more than phlogopite and biotite. In the presence of 30 mg/dm3 EDA, their recoveries were 97.1, 46.3, and 63.8%, respectively. Increasing EDA concentration made a substantial increase in micaceous minerals’ floatability. Adsorption assessments confirmed that increasing the EDA concentration resulted in higher adsorption of EDA onto the surface of micaceous minerals than the quartz (all by physical adsorption). Such a behavior could be related to the nature of micaceous minerals, including their layer structure and low hardness.

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