Annales UMCS, Chemia最新文献

Effect of phospholipid and (phospho)lipase modification on interfacial properties of oil/water emulsion 磷脂和(磷酸)脂肪酶改性对油水乳液界面性质的影响

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0007

A. Wiecek

{"title":"Effect of phospholipid and (phospho)lipase modification on interfacial properties of oil/water emulsion","authors":"A. Wiecek","doi":"10.1515/umcschem-2015-0007","DOIUrl":"https://doi.org/10.1515/umcschem-2015-0007","url":null,"abstract":"Abstract This review paper focused on the effect of typical phosphorlipid (or lecithin) and enzyme modification on electrokinetic parameters of oil/water emulsion. Physicochemical properties of the systems were investigated taking into account the effective diameter of the droplets as well as the zeta potentials using the dynamic light scattering technique. The effect of phospholipid and phospholipase modification on interfacial properties of o/w emulsion was examined as a function of temperature, pH and ionic strength (effect of Na+ or Ca2+ ions which occur in the physiological fluids). The particular role of Ca2+ ions in the dispersions with zwitterionic phospholipids (the main components of biological membrane) was confirmed. The phospholipids dipalmitoylphosphatidylcholine, DPPC or dioleoylphosphatidylcholine, DOPC having the same headgroup bound to the apolar tail composed of two saturated or unsaturated chains were used as stabilizing agents. The effective diameters do not always correlate with the zeta potentials. A possible reason for such behaviour might a mechanism different from the electrostatic stabilization. Phospholipids and their mixtures (e.g. lecithin) may undergo spontaneous aggregation in aqueous solution and organize into liposomes, which possess different sizes and surface affinities. These unique behaviours of phospholipid dispersion can be controlled using the investigated parameters. These findings are expected to increase in importance as phospholipid systems see more use in self-assembly applications. The other aim of the paper was the comparison of the enzyme phospholipase influence on lipid hydrolysis in the o/w emulsion environment. The work is the study which presents the twofold effect of ethanol dipoles on phosholipid hydrolysis. It is believed that the enzyme effect on the phospholipid aggregation behaviour at the oil-water interface will be helpful for understanding different biological phenomena.","PeriodicalId":7937,"journal":{"name":"Annales UMCS, Chemia","volume":"6 1","pages":"109 - 79"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76716571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Activity coefficient at infinite dilution of aqueous solutions of nonionic hydrocarbon and fluorocarbon surfactants as well as their ternary mixtures 非离子型碳氢化合物和氟碳表面活性剂及其三元混合物水溶液的无限稀释活度系数

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0008

Katarzyna Szymczyka, Anna Tarabab

引用次数: 0

Wetting properties of biosurfactant (rhamnolipid) with synthetic surfactants mixtures in the context of soil remediation 生物表面活性剂(鼠李糖脂)与合成表面活性剂混合物在土壤修复中的润湿特性

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0003

E. Hallmann, K. Mędrzycka

引用次数: 12

Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system 双(2-乙基己基)琥珀酸磺酯钠(AOT)和聚氧乙烯(23)十二烷基醚(Brij 35)二元混合物在聚四氟乙烯-溶液-空气体系中的润湿性能

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0010

J. Krawczyk

引用次数: 1

Effect of Pluronics and surfactant adsorption onto dolomite suspension zeta potential and stability Pluronics和表面活性剂吸附对白云石悬浮液zeta电位和稳定性的影响

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0004

A. Kozak, Z. Sadowski

{"title":"Effect of Pluronics and surfactant adsorption onto dolomite suspension zeta potential and stability","authors":"A. Kozak, Z. Sadowski","doi":"10.1515/umcschem-2015-0004","DOIUrl":"https://doi.org/10.1515/umcschem-2015-0004","url":null,"abstract":"Abstract Two kinds of Pluronics (PEO-PPO-PEO triblock copolymers) were used in these studies. They have mixed with anionic surfactant (sodium oleate). The adsorption isotherms of surfactant and copolymer-surfactant mixture onto dolomite have been determined. The adsorbed amount of the Pluronics increases with increasing concentration and reaches plateau. An increase of adsorbed amounts of anionic surfactant onto the mineral surfaces (dolomite) has been observed at the presence of Pluronic copolymers. The adsorption effect of triblock copolymers has been investigated on the zeta potential of dolomite at the water suspension. The interaction of anionic surfactant with copolymers causes a decrease of zeta potential to small amount due to the deformation of double electrical layer. The adsorbed non-ionic Pluronic layer partially screens the surface charge of mineral particles, and thus, reduces the zeta potential. On the other hand, the adsorption of anionic surfactant and copolymer caused a decrease of negative value of zeta potential both investigated minerals. The stability of dolomite suspension depends on the both copolymer and sodium oleate concentrations.","PeriodicalId":7937,"journal":{"name":"Annales UMCS, Chemia","volume":"22 1","pages":"41 - 53"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83483416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ethanol behaviour at the solution-air interface in the presence of Triton X-100 and cetyltrimethylammonium bromide mixture 在Triton X-100和十六烷基三甲基溴化铵混合物存在下乙醇在溶液-空气界面上的行为

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0011

Magdalena Bielawska, A. Zdziennicka

引用次数: 1

Sugar-based surfactants as alternative to synthetic ones 糖基表面活性剂作为合成表面活性剂的替代品

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0012

D. Mańko, A. Zdziennicka

引用次数: 6

Changes in surface properties of polymethylmethacrylate (PMMA) treated with air plasma 空气等离子体处理聚甲基丙烯酸甲酯(PMMA)表面性能的变化

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0006

D. Rymuszka, K. Terpiłowski, L. Hołysz, E. Chibowski

引用次数: 6

On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces 亲疏水固体表面气泡弹跳机理研究

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0002

J. Zawała, Piotr Zawała, K. Małysa

{"title":"On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces","authors":"J. Zawała, Piotr Zawała, K. Małysa","doi":"10.1515/umcschem-2015-0002","DOIUrl":"https://doi.org/10.1515/umcschem-2015-0002","url":null,"abstract":"Abstract The kinetics of collision and bouncing of an air bubble on hydrophilic and hydrophobic solid surfaces immersed in distilled water is reported. We carried out the experiments and compared the bubble collision and bouncing courses on the stagnant and vibrating, with a controlled frequency and amplitude, solid/liquid interface. For stagnant interface differences in the outcome of the bubble collisions with hydrophilic and hydrophobic solid surfaces are resulting from different stability of the intervening liquid film formed between the colliding bubble and these surfaces. The liquid film was unstable at Teflon surface, where the three-phase contact (TPC) and the bubble attachment were observed, after dissipation of most of the kinetic energy associated with the bubble motion. For vibrated solid surface it was shown that kinetics of the bubble bouncing is independent on the hydrophilic/hydrophobic properties of the surface. Similarly like at water/glass hydrophilic interface, even at highly hydrophobic Teflon surface time of the bubble collisions and bouncing was prolonged almost indefinitely. This was due to the fact that the energy dissipated during the collision was re-supplied via interface vibrations with a properly adjusted acceleration. The analysis of the bubble deformation degree showed that this effect is related to a constant bubble deformation, which determined constant radius of the liquid film, large enough to prevent the draining liquid film from reaching the critical thickness of rupture at the moment of collision. The results obtained prove that mechanism of the bubble bouncing from various interfaces depends on interrelation between rates of two simultaneously going processes: (i) exchange between kinetic and surface energies of the system and (ii) drainage of the liquid film separating the interacting interfaces.","PeriodicalId":7937,"journal":{"name":"Annales UMCS, Chemia","volume":"28 1","pages":"15 - 27"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80653283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Reaction volume in aqueous solutions in problem solving 在解决问题的水溶液中的反应体积

Annales UMCS, Chemia Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0005

M. Kosmulski

引用次数: 0