Wyniki wyszukiwania - Biblioteka Nauki

1

Zjawisko zmętnienia roztworów zawierających mieszaninę surfaktantów niejonowych i amfoterycznych

100%

Materna K.

Przemysł Chemiczny

|

2006

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tom T. 85, nr 8-9

617-619

PL

Przedstawiono wyniki badań dotyczących wydzielania fioletu krystalicznego z wodnych roztworów koloidalnych techniką temperatury zmętnienia (CPE). W pracy wykorzystywano niejonowy oraz amfoteryczny związek powierzchniowo czynny. Zaobserwowano, iż najlepszą separację uzyskuje się z roztworu zawierającego mieszaninę surfaktantów z dodatkiem 1 M NaCl, natomiast najsłabszy wynik osiągnięto w przypadku roztworu zawierającego jedynie niejonowy związek powierzchniowo czynny.

EN

Crystal violet was recovered from aq. 2-5 mg/l. solns. by cloud-p. extn. with oxyethylenated(n = 9) methyl dodecanoate as nonionic and cocamidopropyl betaine as zwitterionic surfactant. The dye was recovered (2500 rpm) in 92.1%.from the system contg. dodecanoate 2.5, betaine 0. 5%, and NaCl 1 mol/l.; heating time 6 hrs, The formation of the dye-contg. surfactant phase was incomplete. The water phase contained surfactant-rich agglomerates. NaCl reduced the time of formation and the size of the sepg. agglomerates. In solns. contg. the two surfactants, betaine concn. (should not exceed 0.5%) controlled the cloud p. In aq. 01-5% betaine solns., no cloud p. occurred over 0-100°C.

2

Zaplecze surowcowe, produkcja i zastosowanie związków powierzchniowo czynnych (surfaktantów) na progu nowego milenium

100%

Białowąs E. , Hreczuk W. , Szymanowski J.

|

tom T. 80, nr 10

449-452

3

Wykorzystanie procesów pogłębionego utleniania do rozkładu niejonowego środka powierzchniowo czynnego Triton X-114

100%

Ledakowicz S. , Olejnik D. , Perkowski J. , Żegota H.

|

tom T. 80, nr 10

453-459

4

Determination of hydroperoxides in aqueous solutions containing surfactants by the ferrous oxidation-xylenol orange method

100%

Meisner P. , Gębicki J. L.

Acta Biochimica Polonica

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2009

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tom 56

|

nr 3

523-527

EN

Some surfactants widely used as additives in food, pharmaceuticals, and cosmetic formulations are susceptible to peroxidation resulting in accumulation of hydroperoxides (HP). Our investigation was aimed to study the possible influence of different surfactants on the proportionality and reproducibility of the ferrous oxidation-xylenol orange method developed originally for the determination of hydroperoxides. We also attempted to apply this method to determine hydroperoxides produced radiolytically in surfactant molecules. From our preliminary studies we conclude that the method can be applied for determination of hydroperoxides in systems containing non-ionic or anionic surfactants provided careful calibration is performed for each surfactant.

5

Ultrasonic measurements of aqueous solutions of ?-cyclodextrin with alkyl pyridinium bromides

100%

Balcerzak A.

Archives of Acoustics

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2008

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tom Vol. 33, No. 4

627-641

EN

Ultrasonic measurements of the velocity and absorption coefficient, α/f2, of aqueous solutions of β-cyclodextrin with alkyl pyridinium bromides CnH2n+1C5H4NBr (n = 8, 10, 12), were carried out at the following temperatures: 288.2 K, 298.2 K, 308.2 K and 318.2 K, and frequency range from 1 MHz to 150 MHz. Concentration of the both components equaled 0.01 M. The occurrence of two ultrasonic relaxation processes has been reported. Thermodynamic and kinetic parameters related to these processes have been calculated. The obtained results have been compared with data published previously for α-cyclodextrin systems.

6

Investigations of ultrasonic velocity and absorption in aqueous solutions of [alpha]- and ß-cyclodextrin with sodium alkyl sulfates. Part 1. [alpha]-cyclodextrin systems

100%

Balcerzak A. , Płowiec R. , Juszkiewicz A.

Archives of Acoustics

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2001

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tom Vol. 26, no. 1

37-52

EN

In this part, the velocity and absorption measurements of ultrasonic waves in aqueous solutions of [alpha]-cyclodextrin containing different sodium alkyl sulfates are reported. One or two relaxation processes for these solutions have been established. Thermodynamic and kinetic parameters related to these processes have been calculated. In the second part, experimental results for ß-cyclodextrin will be reported and compared with those presented here.

7

Investigations of ultrasonic velocity and absorption in aqueous solutions of [alpha]- and ß-cyclodextrin with sodium alkyl sulfates. Part 2. ß-cyclodextrin systems

100%

Balcerzak A. , Płowiec R. , Juszkiewicz A.

Archives of Acoustics

|

2001

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tom Vol. 26, no. 1

51-63

EN

In second part of this work, velocity and absorption measurements of ultrasonic waves in aqueous solutions of ß-cyclodextrin containing different sodium alkyl sulfates are reported. One or two relaxation processes for these solutions have been established. Thermodynamic and kinetic parameters related to these processes have been calculated. The results have been compared with those obtained for solutions of ?-cyclodextrin and presented in Part 1 of this paper. Explanation of the origins of these processes has been proposed.

8

The Miscibility of Sodium Dodecyl Sulfonate with Anionic, Nonionic and Cationic Surfactants in Mixed Monolayers and Micelles

100%

Wydro P.

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tom Vol. 81, nr 12

2157-2169

EN

The surface properties of sodium dodecyl sulfonate (SDSn), dodecyl-b-D-glucoside (DG), dodecyltrihydroxyethylammonium bro mide (DTEAB) and sodium dodecyl sul fate (SDS) and their mixtures: SDSn/SDS, SDSn/DG and SDSn/DTEAB were studied. The miscibility and the composition of the mixed monolayers and micelles as well as the interactions between their components were analyzed with the Motomura theory. It was found that among the investigated mixed systems the best surface properties reveal the anionic-cationic mixtures. Moreover, the investigated systems mix nonideally both in the monolayers and micelles. The magnitude of the deviations from ideal behaviour increases in the order: an ionic/an ionic < an ionic/nonionic << an ionic/cationic. Both the mixed monolayers and mi celles formed from SDSn/SDS and SDSn/DG mix tures are richer, as compared to the mixed solutions, in the more surface-active component, while the mixed monolayers and micelles formed from cationic/anionic mixtures (SDSn/DTEAB) possess more symmetrical composition than the mixed solution. As it was found the interactions between molecules both in the mixed monolayers and micelles are more attractive or less repulsive as compared to those in respective one-component monolayers and micelles and the strength of these interactions increases in the order: SDSn/SDS < SDSn/DG < SDSn/DTEAB.

9

Investigation and elimination of surfactant-induced interferences in anodic stripping voltammetry for the determination of trace amounts of cadmium

100%

Grabarczyk M. , Wardak C. , Wawruch A.

Physicochemical Problems of Mineral Processing

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2023

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tom Vol. 59, iss. 4

art. no. 170717

EN

This article aims to investigate in detail to what extent surfactants affect the determination of cadmium by anodic stripping voltammetry. In recent years, the production and use of surfactants have been steadily increasing, so that their concentration in environmental water samples is rising. At the same time, it is known that organic compounds, such as surfactants, often hinder the voltammetric determination of trace elements by stripping. Non-ionic (Triton X-100, Brij 35, Tween 20, Tween 60, Tween 80), cationic (CTAB, CTAC, DTAB, HPC) and anionic (DSS, SDS) compounds were selected to investigate the effect of surfactants on the voltammetric signal of cadmium. At the same time, the extent to which the addition of Amberlite resins to the analysed solution eliminates the interfering effect of surfactants was tested. Three types of Amberlite resins XAD-2, XAD-7 and XAD-16 were selected for the study and the ratio of resin weight to solution volume was determined. Finally, the determination of cadmium in surfactant-enriched environmental samples was carried out. The recoveries obtained between 95.5 and 107%, with RSD between 3.4 and 6.2%, confirm the validity and correctness of the proposed procedure All measurements were carried out by anodic stripping voltammetry using a CNTs/SGC electrode modified with a bismuth film as the working electrode.

10

Critical Coalescence Concetration (CCC) as a parameter for evaluation of selected quaternary ammonium compounds

100%

Szyszka D.

Mining Science

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2013

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tom Vol. 20

101--113

EN

The objective of this paper was to determine the Critical Coalescence Concentration (CCC) of surfactants such as N(dodecyloxycarboxymethyl) N,N,N(trimethylammonium) bromide (DMGM-12), N-[2-(dodecyoxycarboxy)ethyl] N,N,N-(trimethylammonium) bromide (DMALM-12) and N-[3-(dodecanoyloxycarboxy)prophyl] N,N,N-(trimethylammonium) bromide (DMPM-11). The surfactants used represent quaternary ammonium compounds containing a hydrophobic moiety with an ester group (commonly known as “esterquats”). The CCC value was determined by analysis of the relationship between concentration of surfactant and average air bubble diameter. The values of the critical coalescence concentration (CCC) were estimated using a graphical method.

PL

Celem pracy było wyznaczenie krytycznego stężenia koalescencji CCC surfaktantów, takich jak: bromek N-(dodecylooksykarboksymetylo)-N,N,N-trimetyloamoniowy (DMGM-12), bromek N-[2-(dodecylooksykarboksy)etylo]-N,N,N-trimetyloamoniowy (DMALM-12) oraz bromek N-[3-(dodekanoylooksy)propylo]-N,N,N-trimetyloamoniowy (DMPM-11). Zastosowane odczynniki to czwartorzędowe związki amoniowe, zawierające hydrofobową grupę zawierającą grupę estrową (powszechnie nazywane, jako „esterquaty”). Określenie wartości krytycznego stężenia polegało na przeanalizowaniu zależności stężenia badanego surfaktantu od średniej średnicy pęcherzyka powietrza. Wartości krytycznego stężenia koalescencji (CCC) określono za pomocą metody graficznej.

11

Separation of surfactant functionalized single-walled carbon nanotubes via free solution electrophoresis method

100%

Scheibe B. , Rümmeli M. , Borowiak-Palen E. , Kalenczuk R.

Open Physics

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2011

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tom 9

|

nr 2

325-329

EN

This work presents the application of the free solution electrophoresis method (FSE) in the metallic / semiconductive (M/S) separation process of the surfactant functionalized single-walled carbon nanotubes (SWCNTs). The SWCNTs synthesized via laser ablation were purified through high vacuum annealing and subsequent refluxing processes in aqua regia solution. The purified and annealed material was divided into six batches. First three batches were dispersed in anionic surfactants: sodium dodecyl sulfate (SDS), sodium cholate (SC) and sodium deoxycholate (DOC). The next three batches were dispersed in cationic surfactants: cetrimonium bromide (CTAB), benzalkonium chloride (BKC) and cetylpyridinium chloride (CPC). All the prepared SWCNTs samples were subjected to FSE separation process. The fractionated samples were recovered from control and electrode areas and annealed in order to remove the adsorbed surfactants on carbon nanotubes (CNTs) surface. The changes of the van Hove singularities (vHS) present in SWCNTs spectra were investigated via UV-Vis-NIR optical absorption spectroscopy (OAS).

12

Wpływ wybranych anionowych i niejonowych związków powierzchniowo czynnych na pracę osadu czynnego

100%

Wyrwas B. , Kruszelnicka I. , Ginter-Kramarczyk D.

|

tom T. 90, nr 4

613-619

13

The use of surfactant from the Tween group in toluene biofiltration

100%

Miller U. , Sówka I. , Adamiak W.

Archives of Environmental Protection

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2020

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tom Vol. 46, no. 2

53--57

EN

Due to the lower energy consumption and waste production compared to traditional methods, the environmental bioremediation methods based on natural processes have been gradually becoming more prevalent in environmental engineering. Biological methods are used in waste management, wastewater treatment, gas treatment or soil remediation. For the low solubility of some pollutants and lower bioavailability, the use of biological methods may be hampered. This problem might be mitigated with the use of surfactants. This paper presents the results of studies regarding the effect of dosing a selected surfactant from the Tween group (Tween 20) on the efficiency of toluene elimination from the air by biofiltration. The obtained maximum biofiltration rate was 21.2 g/m3/h and 19.8 g/m3/h for the control bed and for the bed to which the Tween 20 solution was dosed, respectively. The effect of Tween was neutral (the effectiveness of toluene removal was insignificantly comparable to the effectiveness of the control series), it did not affect the effectiveness or limited the development of the biofilter microflora.

14

Zastosowanie związków makrocyklicznych jako nowego typu surfaktantów w procesach selektywnego wydzielania jonów metali

100%

Walkowiak W.

Przemysł Chemiczny

|

2006

|

tom T. 85, nr 8-9

1359-1364

PL

Przedstawiono związki makrocykliczne (etery koronowe, kaliksareny i acykliczne polietery) jako nowego typu surfaktanty w procesach selektywnego wydzielania (ekstrakcja ciecz–ciecz, transport przez ciekłe membrany i flotacja jonów). Omówiono konkurencyjną flotację izotopów Cs-137, Sr-90 i Ba-133 jonizowalnymi eterami lariatowymi oraz Zn(II) i Cd(II) jonizowalnymi eterami koronowymi i eterami, ekstrakcję ciecz–ciecz kationów Cs⁺, Co²⁺ i Sr²⁺ za pomocą niejonizowalnych eterów koronowych w obecności kwasu 5,8-dinonylonaftalenosulfonowego (DNNS) i ekstrakcję ciecz–ciecz kationów litowców i berylowców za pomocą jonizowalnych dibenzo eterów lariatowych i acyklicznych polieterów, a także konkurencyjny transport kationów litowców i berylowców w procesach permeacji przez ciekłe membrany za pomocą związków makrocyklicznych.

EN

A review with 44 refs. covering crown ethers, calixarenes, calyx-crown-arenes, and acyclic polyethers as surfactants in solvent extn., transport across liq. membranes, and ion flotation, esp. competitive ion flotation of Zn(II) and Cd(II); and Cs-137, Sr-90, and Ba-133 with ionizable lariat ethers; solvent extn. of Li and Be groups cations with ionizable dibenzo crown ethers and acyclic polyethers; calixarenes as ion carriers in liq. membrane transport; and competitive transport of Li and Be groups cations in permeation through liq. membranes.

15

Wpływ substancji powierzchniowo czynnych na szybkość procesu stabilizacji nitrocelulozy

100%

Kuboszek R. , Nowak T. , Pawłowski W. , Syczewski M.

Przemysł Chemiczny

|

1998

|

tom T. 77, nr 4

139-143

16

Otrzymywanie innowacyjnych polimerowych środków powierzchniowo czynnych

88%

Biniecka P. , Pieńkowska M.

Przemysł Chemiczny

|

2021

|

tom T. 100, nr 7

668--671

PL

Otrzymano 9 związków powierzchniowo czynnych w reakcji transestryfikacji tereftalanu 2-etyloheksylu z poliglikolem etylenowym i w następczych reakcjach estryfikacji kwasów tłuszczowych (oleinowy, stearynowy i walerianowy) 2-etyloheksanolem, prowadzonych w obecności katalizatorów metaloorganicznych. Oznaczono ich właściwości fizykochemiczne i powierzchniowo czynne (napięcie powierzchniowe, lepkość, pH, zwilżalność, rozpuszczalność w wodzie, współczynnik HLB, wskaźnik trwałości piany oraz punkt zmętnienia). Otrzymane surfaktanty charakteryzowały się współczynnikiem HLB w zakresie 11-16, co świadczyło o ich hydrofilowym charakterze, wszystkie były dobrymi emulgatorami typu O/W i środkami piorącymi.

EN

Nine surfactants were obtained by transesterification of 1,4-(BuEtCCH₂OCO)₂C₆H₄ with polyethylene glycol and subsequent esterification reactions of fatty acids (oleic, stearic or valeric) with BuEtCCH₂OH, carried out in the presence of organometallic catalysts. Their phys.-chem. and surface active properties (surface tension, viscosity, pH, wettability, water solubility, HLB coeff., foam durability index and cloud point) were detd. The surfactants showed the HLB coeff. in the range of 11-16, which proved their hydrophilic nature. They were all good oil/water emulsifiers and washing agents.

17

Magnetic field effects on surfactants adsorption on the solid surface as regards of its wettability

88%

Hołysz L. , Chibowski E. , Terpiłowski K.

Physicochemical Problems of Mineral Processing

|

2020

|

tom Vol. 56, iss. 6

101--113

EN

The static magnetic field MF (0.44 T) effects on the adsorption of three surfactants: cationic bromide (DTAB) and hexadecyltrimethylammonium bromide (CTAB), and anionic sodium dodecylsulfate (SDS) from their 10-3 M solutions were studied on bare and low-temperature air plasma treated glass plates. The surface properties of the adsorbed surfactants layers were determined via the water advancing and receding contact angles measurements and then calculation of the apparent surface free energy. An optical profilometer was used to determine the structure and topography of the adsorbed layers. The DTAB and SDS concentrations were below their critical micelle concentration and that of CTAB very close to its cmc. The results showed that in the case of DTAB solution (much below its cmc) a small decrease in the contact angle appeared while in CTAB (close to its cmc) an increase in the contact angle value was observed if adsorbed in the MF presence. Quite good reproducibility of the contact angle values was obtained. This was not the case for the SDS solution where the contact angle values were scattered. The reason was that the anionic surfactant did not adsorb homogeneously on the negatively charged glass surface. The contact angles and the calculated values of the work of water spreading clearly show that MF influences the structure of the surfactant adsorbed layer which was also supported by the optical profilometry images.

18

Adsorption effectiveness and adsorption efficiency of chosen surfactants

88%

Rekiel E. A.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

|

2019

|

tom 74

|

nr 2

EN

Surfactants are various types of chemical compounds that are present in almost every aspect of our life. They are used in many branches of industry, especially in food, cosmetics, pharmaceuticals and even in confectionery. They are considered one of the best solutions for oil residues, soil bioremediation and dealing with PAHs contaminations. Their versatility comes from their amphiphilic build – one part of the compound has hydrophilic properties (head), the other has hydrophobic properties (tail). This fact causes surfactants affinity both to polar and nonpolar compounds. Some of the classical surfactants still can affect fauna and flora by accumulating in ground waters or simply by causing allergies. In that case, many companies decide to limit their surfactant usage and reach for substances present in nature which have very similar, if not better, properties. Biosurfactants are surface active agents produced mainly by microorganisms such as bacteria, fungi and yeasts. There are many papers related to different properties (CMC, aggregation number, surface excess concentration) of various types of surfactants. However, it is difficult to find papers describing the same properties for different surfactants. In this study, adsorption effectiveness and adsorption efficiency at the water-air interface of chosen surfactants: sodium dodecylsulfate (SDDS), cationic: cetyltrimetylammonium bromide (CTAB), nonionic: Triton X-100 (TX-100) and biosurfactants: surfactin (SF) and monorhamnolipid (RL) has been compared. Both efficiency and effectivenes decide about the practical surfactants application.

19

Removal of Organic Dyes from Aqueous Solutions with Surfactant-Modified Magnetic Nanoparticles

88%

Wybieralska K. , Wajda A.

Polish Journal of Chemical Technology

|

2014

|

tom Vol. 16, nr 2

27--30

EN

The paper presents the results of studies on the possibility of using magnetic nanoparticles modified with selected hydrophobic surfactants for model post-production water purification. Colloidal solutions of iron hydroxide (III) and iron oxide (II and III) were obtained and their particles were subjected to surface modification using surfactants. Thus obtained magnetic fluids were used as active agents in the process of removing selected organic dyes from their aqueous solutions. The effectiveness of the modified compounds was analysed using spectrophotometric methods. It has been shown that the effectiveness of the process depends on the type of surfactant used to modify selected magnetic nanoparticles.

20

The removal investigation of nonylphenol etoxilat surfactants in activated sludge systems

88%

Ahansazan B. , Moazenipour B.

|

tom Vol. 15, nr 3

1--5

EN

The most significant source of environmental pollution derived from perilous wastes is the circumstantial and intentional emancipation of specific industrial wastes including resistant and/or toxic pollutants to natural environments. Although, biological treatment methods have been commonly found as most effective alternatives in the removal of persistent compounds in industrial wastewaters, they require some increase for obtaining acceptable removal efficiencies, due to the presence of refractory or toxic compounds in the wastewaters. In this study, the use of surfactant of nonylphenol ethoxylates (NPE) in the removal of persistent organic pollutants by biological treatment processes was investigated as an enhancement technique. The application of surfactants can enhance soil and groundwater remediation by increasing contaminant locomotion and solubility to ameliorate the performance of practical conventional remediation technology and by barricading the departure of contaminants to speed the rate of biodegradation of contaminants in environment. The proven effectiveness of surfactants in soil and groundwater remediation has been considered reasonable to expect that surfactants can also enhance the removal of persistent organic pollutants in wastewaters. Different concentrations of nonylphenol ethoxylates (NPE) (1000, 1500, 2000 ppm) were tested to optimize biosurfactant-enhanced degradation of persistent pollutants in wastewaters. The results of this study demonstrate that the biodegradation of persistent organic pollutants in wastewaters is elevated by the use of biosurfactants. The principal mechanism that raises the biodegradation is the augment solvability of poorly soluble compounds in the wastewater. According to the results of this study, it can be anticipated that biosurfactant-enhanced degradation would result in faster and more complete degradation.