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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0007
A. Wiecek
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.
摘要本文综述了典型的磷脂(或卵磷脂)和酶修饰对油/水乳液电动力学参数的影响。考虑液滴的有效直径和zeta势,利用动态光散射技术研究了体系的物理化学性质。研究了磷脂和磷脂酶修饰对乳状液界面性能的影响,考察了温度、pH和离子强度(生理液体中Na+或Ca2+离子的作用)的函数。证实了Ca2+离子在两性离子磷脂(生物膜的主要成分)分散中的特殊作用。采用头基相同的磷脂双棕榈酰基磷脂酰胆碱、DPPC或二油基磷脂酰胆碱、DOPC作为稳定剂,它们与由两条饱和或不饱和链组成的极性尾部结合。有效直径并不总是与ζ电位相关。这种行为的一个可能原因可能是不同于静电稳定的机制。磷脂及其混合物(如卵磷脂)可在水溶液中自发聚集并组织成具有不同大小和表面亲和力的脂质体。磷脂分散的这些独特行为可以用所研究的参数来控制。随着磷脂系统在自组装应用中的应用越来越多,这些发现的重要性有望增加。本文的另一个目的是比较磷脂酶对乳化液环境下脂质水解的影响。研究了乙醇偶极子对磷脂水解的双重作用。认为酶对磷脂在油水界面聚集行为的影响将有助于理解不同的生物现象。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0008
Katarzyna Szymczyka, Anna Tarabab
Abstract Activity coefficients at infinite dilution of the aqueous solutions of nonionic hydrocarbon surfactants, p-(1,1,3,3- tetramethylbutyl) phenoxypoly(ethylene glycols), Triton X-100 (TX100) and Triton X-165 (TX165), fluorocarbon surfactants, Zonyl FSN-100 (FSN100) and Zonyl FSO-100 (FSO100) and their ternary mixtures were determined from the Gracia-Fadrique et al. method for non-volatile compounds. The values of activity coefficients were calculated taking into account the surface tension data of the studied systems at 293K and compared to those determined on the basis of the values of the contact angle of solutions on the polytetrafluoroethylene (PTFE) and polymethyl methacrylate (PMMA) surfaces and the solid-liquid interface tension.
采用Gracia-Fadrique等人的非挥发性化合物测定方法,测定了非离子型碳氢化合物表面活性剂对(1,1,3,3-四甲基丁基)苯氧聚乙二醇、Triton X-100 (TX100)和Triton X-165 (TX165)、氟碳表面活性剂、Zonyl FSN-100 (FSN100)和Zonyl FSO-100 (FSO100)及其三元混合物在水溶液无限稀释下的活度系数。根据所研究体系在293K时的表面张力数据计算活度系数值,并与聚四氟乙烯(PTFE)和聚甲基丙烯酸甲酯(PMMA)表面溶液的接触角值和固液界面张力计算的活度系数值进行比较。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0003
E. Hallmann, K. Mędrzycka
Abstract Wetting properties of synthetic surfactant Rokanol NL6, biosurfactant JBR 425 and their mixture have been investigated. On the basis of these investigations, the ability of used surfactants to remove the synthetic base oil (PAO6) from sandy soil and clay loam was evaluated. Surfactant solutions were applied for soil flushing in batch experiments. The results show that synthetic surfactant addition worsens physicochemical properties of pure biosurfactant but exhibits much higher oil removal efficiency than biosurfactant does.
摘要研究了合成表面活性剂Rokanol NL6、生物表面活性剂JBR 425及其混合物的润湿性能。在此基础上,评价了不同表面活性剂对砂土和粘壤土中合成基础油(PAO6)的去除效果。在批量试验中,采用表面活性剂溶液进行土壤冲洗。结果表明,合成表面活性剂的加入使纯生物表面活性剂的理化性质变差,但其除油效率远高于生物表面活性剂。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0010
J. Krawczyk
Abstract Wettability of poly(tetrafluoroethylene) (PTFE) by aqueous solutions of binary mixtures composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) with polyoxyethylene (23) lauryl ether (Brij 35) was considered on the basis of the measured values of contact angle and surface tension. It was shown that the value of the critical surface tension of PTFE surface wetting at the studied system (23.5 mN/m), does not depend on the concentration and composition of the binary mixtures of studied surfactants in water, and it was higer than the surface tension of PTFE (20.2 mN/m). The best wettability of polytetrafluoroethylene (PTFE) by studied aqueous solutions of binary surfactants mixtures occurs at the mixtures concentration corresponding to the critical micelle concentration of their solutions.
摘要根据接触角和表面张力的测量值,研究了聚四氟乙烯(PTFE)在双(2-乙基己基)磺基琥珀酸钠(AOT)与聚氧乙烯(23)十二烷基醚(Brij 35)二元混合物水溶液中的润湿性。结果表明,聚四氟乙烯表面润湿的临界表面张力值(23.5 mN/m)不取决于所研究的表面活性剂在水中的二元混合物的浓度和组成,而是高于聚四氟乙烯的表面张力(20.2 mN/m)。所研究的二元表面活性剂混合物对聚四氟乙烯(PTFE)的最佳润湿性出现在与其溶液临界胶束浓度相对应的混合物浓度。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0004
A. Kozak, Z. Sadowski
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.
采用两种Pluronics (PEO-PPO-PEO三嵌段共聚物)进行了研究。它们与阴离子表面活性剂(油酸钠)混合。测定了表面活性剂和共聚物-表面活性剂混合物在白云石上的吸附等温线。Pluronics的吸附量随着浓度的增加而增加,达到平台。在Pluronic共聚物的存在下,阴离子表面活性剂在矿物表面(白云石)上的吸附量增加。研究了三嵌段共聚物对白云石在水悬浮液中zeta电位的吸附作用。阴离子表面活性剂与共聚物的相互作用导致双电层的变形,使zeta电位降低到很小的程度。吸附的非离子Pluronic层部分屏蔽了矿物颗粒的表面电荷,从而降低了zeta电位。另一方面,阴离子表面活性剂和共聚物的吸附使两种矿物的zeta电位的负值减小。白云石悬浮液的稳定性取决于共聚物和油酸钠的浓度。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0011
Magdalena Bielawska, A. Zdziennicka
Abstract On the basis of the surface tension ( γLV) data of the aqueous solutions of p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol) (Triton X-100 or TX-100) and cetyltrimethylammonium bromide (CTAB) mixture with ethanol published in our previous paper, the process of ethanol adsorption was investigated. For that reason, the values of Gibbs surface excess concentration of ethanol at the solution-air interface and Gibbs standard free energy of its adsorption at that interface were calculated and compared with those determined for the aqueous solutions of ethanol. The surface excess concentration of ethanol at the solution-air interface was calculated with two different methods. The standard free energy of alcohol adsorption was determined from both the Gu and Zhu and Langmuir equations.
摘要以前人发表的对-(1,1,3,3-四甲基丁基)苯氧聚乙二醇(Triton X-100或TX-100)和十六烷基三甲基溴化铵(CTAB)与乙醇混合物水溶液的表面张力(γ - lv)数据为基础,研究了乙醇吸附过程。为此,我们计算了乙醇在溶液-空气界面处的吉布斯表面过量浓度值及其在该界面处吸附的吉布斯标准自由能,并与乙醇水溶液的测定值进行了比较。用两种不同的方法计算了溶液-空气界面处乙醇的表面过量浓度。由Gu和Zhu方程和Langmuir方程确定了乙醇吸附的标准自由能。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0012
D. Mańko, A. Zdziennicka
Abstract From year to year natural surfactants are gaining ever growing awareness because of their valuable properties (in the absence of negative impact on the environment, as with the use of synthetic surface active agents). In the group of surfactants of natural origin there are surface active agents produced by microorganisms (biosurfactants) or compounds having a natural part (hydrophilic head and/or hydrophobic tail) [1]. This review includes the short characteristic of surfactants with sugar-head group in their structure called sugar-based surfactants. The structure, properties and some applications of these surfactants are described in this paper.
年复一年,天然表面活性剂因其宝贵的特性(与使用合成表面活性剂相比,对环境没有负面影响)而获得越来越多的认识。在天然来源的表面活性剂组中,有由微生物产生的表面活性剂(生物表面活性剂)或具有天然部分(亲水头部和/或疏水尾部)[1]的化合物。本文综述了结构中具有糖头基团的表面活性剂的特点,即糖基表面活性剂。本文介绍了这些表面活性剂的结构、性质及其应用。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0006
D. Rymuszka, K. Terpiłowski, L. Hołysz, E. Chibowski
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0002
J. Zawała, Piotr Zawała, K. Małysa
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.
摘要研究了气泡在蒸馏水中与亲疏水固体表面的碰撞和弹跳动力学。在控制频率和振幅、固液界面的滞动和振动条件下,对气泡碰撞和弹跳过程进行了实验对比。对于停滞界面,气泡与亲疏水固体表面碰撞结果的差异是由于碰撞气泡与亲疏水固体表面之间形成的中间液膜的稳定性不同造成的。液膜在聚四氟乙烯表面不稳定,存在三相接触(TPC)和气泡附着,气泡运动相关的大部分动能耗散后。对于振动的固体表面,气泡的弹跳动力学与表面的亲疏水性无关。与水/玻璃亲水性界面相似,即使在高度疏水性的聚四氟乙烯表面,气泡碰撞和弹跳的时间也几乎无限期延长。这是由于在碰撞过程中消耗的能量通过界面振动在适当调整的加速度下重新提供。对气泡变形程度的分析表明,这种影响与恒定的气泡变形有关,而恒定的气泡变形决定了液膜的恒定半径,该半径大到足以防止排液膜在碰撞时刻达到破裂的临界厚度。结果表明,气泡从不同界面反弹的机理取决于两个同时进行的过程速率之间的相互关系:(i)系统的动能和表面能之间的交换;(ii)分离相互作用界面的液膜的排水。
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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
Pub Date : 2015-06-01 DOI: 10.1515/umcschem-2015-0005
M. Kosmulski
Abstract The volumes of reactions in solution are usually ignored in problem solving. Neglection of reaction volumes may lead to errors on the order of 1 % in the final result. Calculation of the volume of neutralization reaction based on the specific densities of solutions from chemical tables is demonstrated.
在解决问题时,溶液中反应的体积通常被忽略。忽略反应体积可能导致最终结果出现1%左右的误差。根据化学表中溶液的比密度计算中和反应的体积。
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引用次数: 0
期刊
Annales UMCS, Chemia
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