Wetting properties of Saponaria officinalis saponins

Publication date: Available online 16 September 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Edyta Rekiel, Wojciech Smułek, Anna Zdziennicka, Ewa Kaczorek, Bronisław JańczukAbstractThe contact angles of water, formamide and diiodomethane on the polytetrafluoroethylene (PTFE), poly(methyl methacrylate) (PMMA) and quartz covered with Saponaria officinalis saponins and pure hederagenin films as well as the contact angles of aqueous solutions of saponins on the PTFE, PMMA and quartz surface, were measured. The adsorption of the saponins at the solid-water interface was also compared to that at the water-air one. The possibility to adsorb the saponins at the solid-water interface was analyzed on the basis of the Gibbs standard free energy of adsorption relative to the Gibbs free energy of interactions of saponins molecule with solid surface through the water phase. The changes in the solid-water and water-air interface tension under the influence of saponins adsorption were considered in the light of the PTFE, PMMA and quartz wettability by the aqueous solution of saponins. From this consideration it results that the contact angle of aqueous solution of saponins on PTFE, PMMA and quartz surface as well as the adhesion work of these solutions to solid can be predicted on the basis of the components and parameters of the water, solid and solution surface tensions. Experiments indicated that saponins are poor wetting agents and the adhesio...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research

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Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Ram Krishna Upadhyay, Arvind KumarAbstractEpoxy-graphene composites are prepared with varying graphene concentration of 1 wt%, 3 wt%, and 5 wt%. Composite fabrication involves continuous stirring of the mixture consisting graphene and epoxy resin followed by curing first at room temperature and subsequently at 100 °C. In the epoxy-graphene composites, compressive stresses show increasing trend with filler concentration. A correlation between surface roughness and wetting is established to explain the Wenzel'...
Source: Colloids and Interface Science Communications - Category: Nanotechnology Source Type: research
Publication date: Available online 11 October 2019Source: Bioactive Carbohydrates and Dietary FibreAuthor(s): Digambar Kavitake, Farhat Zakirhusain Marchawala, Cedric Delattre, Prathapkumar Halady Shetty, Hilor Pathak, Prasad AndhareAbstractSuccinoglycan exopolysaccharide (EPS) from Rhizobium radiobacter CAS and its rheological behavior has been studied earlier. In present investigation the emulsifying potential of CAS EPS has been determined. CAS EPS concentration was optimized with hydrocarbons soybean oil and n-Hexane, whereas effect of pH (3.0–11.0), salinity, monovalent ions, divalent ion, (NaCl, KCl and MgCl2),...
Source: Bioactive Carbohydrates and Dietary Fibre - Category: Food Science Source Type: research
Publication date: Available online 11 October 2019Source: Materials LettersAuthor(s): Zeqin Cui, Zhen Qin, Peng Dong, Yunjun Mi, Dianqing Gong, Weiguo LiAbstractThe FeCoNiCrMn high-entropy alloy (HEA) coatings were prepared by high-speed laser cladding (HSLC) technology, and the surface was subjected to ultrasonic surface mechanical rolling treatment (SMRT). After SMRT, the surface of the coatings show a gradient structure. The coatings consist of planar crystal, columnar dendrites and equiaxed crystals from inside to outside. Corrosion behavior in a 3.5% NaCl solution indicates that SMRTed coatings exhibit higher corrosio...
Source: Materials Letters - Category: Materials Science Source Type: research
Publication date: 1 January 2020Source: Materials Letters, Volume 258Author(s): Changji Xuan, Keiji Nakajima, Hiroyuki Shibata, Pär Göran JönssonAbstractThis work reported the wetting and spreading behavior of pure iron droplet on single crystal TiO2 substrate. During the heating process, a “FeO·TiOx separated liquid phase” appeared at the temperature below the melting point of the pure iron, and completely covered the lower half of the iron droplet. The observed high-wetting behavior of the droplet is due to the spreading of the “separated liquid phase” rather than the iron dr...
Source: Materials Letters - Category: Materials Science Source Type: research
In this study, the superhydrophobic BiOBr cotton fabric with photocatalitic property may provide a new solution for the treatment of water resource.Graphical Abstract
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
The Journal of Physical Chemistry CDOI: 10.1021/acs.jpcc.9b05294
Source: The Journal of Physical Chemistry C - Category: Chemistry Authors: Source Type: research
Abstract The 3-aminopropyltriethoxysilane (APTES) is a common method for biomolecule immobilization on silicon and silicon derivatives such as silicon nitride (Si3N4). However, there are many parameters which impact the efficiency of APTES modification such as APTES concentration and reaction time. Thus, various APTES concentrations (0.1%, 0.5%, 1%, 2%, 5%, and 10%) under different reaction times (15, 30, 60 and 120 min) were compared to achieve the optimal APTES modification condition which produced a thin and stable APTES layer on Si3N4 surface. The modified surfaces were characterized by contact angle (CA) me...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
Publication date: Available online 8 October 2019Source: Chemical Engineering ScienceAuthor(s): Henry Atkinson, Jason E. Bara, C. Heath TurnerAbstractBismuth telluride is among the most studied thermoelectric materials. Its performance, which is among the highest around room temperature, is dependent on exfoliation to thin nanosheets. While previous research has examined the exfoliation mechanism by ionic liquids (ILs), this study provides more detailed information about the solid-liquid interface, including predicted values for IL contact angles (θ) on Bi2Te3. Molecular dynamics simulations are employed to compute &...
Source: Chemical Engineering Science - Category: Chemistry Source Type: research
Publication date: Available online 8 October 2019Source: Journal of Materials Research and TechnologyAuthor(s): Peng Jin, Yibo Liu, Qingjie Sun, Qiaoli Lin, Junzhao Li, Kun Chen, Jianfeng Wang, Shaojun Hou, Fuxiang Li, Jicai FengAbstractThe wetting behaviour of Al alloys (i.e., 6061 Al and 4043 Al alloys) on the surface of pure titanium was studied by sessile drop method at temperatures of 873–973 K under high vacuum with ˜10−4 Pa. All wetting processes were divided into two stages: in the nonlinear stage, the formation of a compact intermetallic layer (Ti7Al5Si12) blocked the mass transfer at solid/...
Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research
Abstract Universal nanocrystal formulation which can be applied to water-insoluble compounds was proposed and the criteria of its physicochemical properties as an active pharmaceutical ingredients (API) were investigated. Nanocrystal suspension was prepared by a wet-beads milling method. An acceptable Critical Quality Attributes (CQA) of nanocrystal suspension was defined by Z-average less than 500 nm and Polydispersity index (PDI) less than 0.3. Screening studies of dispersing and wetting agents were conducted using three model compounds in different pKa, melting points, etc., to find universal nanocrystal...
Source: Chemical and Pharmaceutical Bulletin - Category: Drugs & Pharmacology Authors: Tags: Chem Pharm Bull (Tokyo) Source Type: research
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