양이온성 계면활성제 거품 지속성 증진방법 연구

김홍열(Hong Yeol Kim),정승우(Seung Woo Jeong) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.11

계면활성제 거품(foam)을 아예 형성하지 못하거나 foam 지속도가 매우 낮은 양이온성 계면활성제의 foam 지속성을 높이는 방법에 대해 연구하였다. 음이온성 계면활성제를 보조제로 첨가하는 방법, 콜로이드를 혼합하는 방법, 수용성 수지인 폴리비닐알콜을 첨가하는 방법 등 다양한 시도를 평가하였다. 각 5% 양이온성 계면활성제 용액의 foam 지속도를 평가한 결과, Cationic starch (CA-ST)는 foam이 전혀 발생되지 않았지만, Methyl triethanol ammonium methyl sulfate distearyl ester (CEQ90)의 foam 지속시간은 평균 46초, Cetyl trimethyl ammonium chloride (CM29)는 평균 31초로서 매우 낮았다. 음이온성 계면활성제 Sodium dodecyl sulfate (SDS) 첨가는 양이온성 계면활성제의 종류에 따라 지속도가 매우 다르게 나타났다. Cationic starch (CA-ST)의 foam 지속도는 매우 크게 증가된 반면 CEQ90와 CM29는 오히려 감소되었다. 콜로이드(SiO₂, kaolin) 혼합이 양이온성 계면활성제 foam 지속도에 미치는 영향을 평가한 결과, CA-ST는 콜로이드 혼합시 foam이 전혀 발생되지 않았고, CEQ90과 CM29는 콜로이드를 주입하였을 경우 주입을 하지 않았을 때보다 지속도가 높아졌다. 수용성수지인 polyvinyl alcohol (PVA)첨가가 양이온성 계면활성제 foam 지속도에 미치는 영향을 평가한 결과, CA-ST는 PVA혼합에서도 foam이 전혀 발생 되지 않았지만, CEQ90과 CM29는 PVA의 농도가 높을수록 foam 지속도가 증가하였다. 양이온성 계면활성제에 음이온성 계면활성제 SDS와 콜로이드를 동시에 첨가한 결과 콜로이드보다 음이온성 계면활성제에 의해 양이온성 계면활성제 foam 지속도가 결정 되었다. 음이온성 계면활성제 SDS와 PVA를 동시에 첨가하여 평가한 결과 PVA보다 역시 음이온성 계면활성제에 의해 양이온성 계면활성제의 foam 지속도가 결정되었다. Foam을 전혀 형성하지 못했던 양이온성 계면활성제인 CA-ST는 음이온성 계면활성제 SDS 0.14%, PVA 2.5% 첨가 조건에서 foam 지속시간이 평균 8,780초로 획기적으로 증가하였고 타 양이온성 계면활성제 CEQ90 보다 약 8배 이상의 지속시간을 보여주었다. 본 연구결과 foam이 형성되지 않거나 지속시간이 매우 짧은 양이온성 계면활성제는 음이온성 계면활성제를 첨가할 경우 foam형성에 도움을 받을 수 있고 colloid 및 PVA 등의 보조를 통해 양이온성 계면활성제의 지속도를 혁신적으로 증가시킬 수 있는 것으로 확인되었다. 그리고 양이온 계면활성제의 foam 지속도는 음이온성 계면활성제의 첨가농도에 의해 가장 큰 영향을 받는 것으로 보인다. This study tried to find a suitable method for enhancing the foam stability of cationic surfactants that normally generate less foam or no foam. Several trials were made to enhance the foam stability: addition of anionic surfactant, colloids and polymer. Cationic starch (CA-ST) did not form foam at all, while the foam stability of two other cationic surfactant also showed low levels; methyl triethanol ammonium methyl sulfate distearyl ester (CEQ90) for 46 sec. and Cetyl trimethyl ammonium chloride (CM29) for 31 seconds. Foam stability of cationic surfactants were significantly affected by addition of anionic surfactant, sodium dodecyl sulfate (SDS). Foam stability of CA-ST was significantly enhanced by addition of SDS, while those of CEQ90 and CM29 were decreased. Addition of colloids (SiO₂, kaolin) and polyvinyl alcohol (PVA) enhanced foam stabilities of CEQ90 and CM29. However, CA-ST did not form foam even in the presence of colloids or PVA. Effect of simultaneous addition of colloids and anionic surfactant on foam stability of cationic surfactant showed that foam stability of cationic surfactant was more influenced by addition of anionic surfactant than colloids. Effect of simultaneous addition of PVA and anionic surfactant on the foam stability of cationic surfactant also showed that presence of anionic surfactant significantly affect the foam stability of cationic surfactant. Foam stability of CA-ST was greatly increased to 8,780 seconds by addition of SDS 0.14% and PVA 2.5%. The foam stability of CA-ST was 8 times higher than CEQ 90. This study suggested that cationic surfactants not forming foam can generate foam by addition of anionic surfactant and its stability can be additionally increased by addition of colloids and PVA. The study results showed that enhancement in foam stability of cationic surfactant was prominently affected by the concentration of anionic surfactant added.

Effect of silica nanoparticles on the stability of decontamination foam and their application for oxide dissolution of corroded specimens

Yoon, I.H.,Jung, C.H.,Yoon, S.B.,Park, S.Y.,Moon, J.K.,Choi, W.K. Pergamon Press ; Elsevier Science Ltd 2014 Annals of nuclear energy Vol.73 No.-

Foam stability was investigated by varying the amount of silica nanoparticles in a decontamination foam containing a surfactant and a stabilizer. In addition, a study on the oxide dissolution of a corroded specimen using a decontamination foam was performed to evaluate the decontamination efficiency of the foam. The decontamination foam prepared with Elotant(TM) Milcoside 440N (EM440N) as a non-ionic surfactant displayed the highest foam stability compared with that of foam containing other surfactants such as SDS and Triton X-100 in acidic pH. For the decontamination foam prepared using silica nanoparticles, the liquid volume in the foam was enhanced by a factor of 2 compared with that of the foam prepared using only a surfactant. Silica nanoparticles are thought to play a key role as an effective stabilizer of decontamination foam in acidic pH. The decontamination efficiency toward dissolving iron was improved by up to approximately 94% when using a decontamination foam in 1.0% EM440N consisting of the mixture of 3.0wt.% silica nanoparticles and 0.1wt.% xanthan gum compared with that of the chemical decontamination agent alone. This result indicates that an increase in foam stability enhanced the oxide dissolution of the decontamination foam owing to an increase in the contact time between the decontaminant foam and the corroded specimen.

Tunable stability of oil-containing foam systems with different concentrations of SDS and hydrophobic silica nanoparticles

Shuangqing Sun,Yan Wang,Congtai Yuan,Hongbing Wang,Wendong Wang,Jianhui Luo,Chunling Li,Songqing Hu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

Experiment and molecular dynamics simulation were carried out to study the tunable stability of oilcontainingSDS-stabilized Nitrogen-in-water foam. The experimental results show that the foam stabilitycould be tuned by the concentrations of SDS and modified SiO2 nanoparticles. In the foam systems with alow SDS concentration (0.2 wt.%), the foams show poor stability and the foam stability was almost notaffected by the addition of modified SiO2 nanoparticles. The foam stability was greatly improved atmoderate SDS concentration (0.5 wt.%), it enhancedfirst and then weakened with the increase ofmodified SiO2 concentration, and the half-life time achieved a maximum value of 1292 s at 0.05 wt.%modified SiO2. However, at high SDS concentration (0.8 wt.%), the foam stability was pretty good exceptfor when the modified SiO2 concentration is too high (>0.2 wt.%). The microscopic mechanism wasobtained by investigating the structural and dynamic properties of the foamfilm. The simulation workshowed consistent results of foam stability with the experimental results. Moreover, it also revealed thatthe concentration and configuration of SDS will affect its interaction with SiO2 and oil molecule, which iscritical to foam stability.

Effect of fish gelatine-sodium alginate interactions on foam formation and stability

Phawaphuthanon, Natthiya,Yu, Daeung,Ngamnikom, Peerapong,Shin, Il-Shik,Chung, Donghwa Elsevier 2019 Food hydrocolloids Vol.88 No.-

<P><B>Abstract</B></P> <P>The effect of fish gelatine (FG)−alginate (AL) interactions on the formation and stability of foams was investigated by examining relationships between surface, bulk, and foaming properties of aqueous mixtures of FG and AL at 25 °C under different values of pH and FG:AL ratio. Replacing a portion of FG with AL (FG:AL ratio = 80:20, 50:50, and 20:80) at pH 5.0 or 7.0 increased the air-liquid surface tension, negative electrophoretic mobility, bulk viscosity, and particle size of FG−AL mixtures. At pH 3.5 (below the isoelectric point of FG), the AL replacement increased the particle size more dramatically; however, it suppressed trends of increasing negative electrophoretic mobility and bulk viscosity, and even reduced the surface tension, due to stronger electrostatic attractions between oppositely charged FG and AL molecules and the resulting formation of more charge-neutralised FG−AL complexes. Foaming ability became stronger as the surface tension decreased, the negative electrophoretic mobility approached to zero (more charge-neutralised), and the bulk viscosity decreased; however, it was not closely correlated with particle size. FG−AL mixtures had a weaker foaming ability than solutions prepared only with FG or whey protein concentrate; however, these mixtures exhibited much higher foam stability during storage at 25 °C. FG−AL mixtures prepared at pH 3.5 and a FG:AL ratio of 80:20 showed the best foaming ability and foam stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FG−AL interactions strongly influenced the foaming properties of FG−AL mixtures. </LI> <LI> Surface, bulk, and foaming properties of FG−AL mixtures were mutually related. </LI> <LI> FG−AL mixtures had a weaker foaming ability than FG or whey protein solutions. </LI> <LI> FG−AL mixtures showed greater foam stability than FG or whey protein solutions. </LI> <LI> FG−AL mixtures showed the best foaming properties at pH 3.5 and FG:AL = 80:20. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Analysis of the Foam Generated Using Surfactant Sodium Lauryl Sulfate

G. Indu Siva Ranjani,K. Ramamurthy 한국콘크리트학회 2010 International Journal of Concrete Structures and M Vol.4 No.1

The performance evaluation of a sodium lauryl sulfate to qualify as a foaming agent is presented in this paper. When new surfactants are used a systematic study of production parameters on the foam characteristics needs to be undertaken unlike proprietary foaming agents and foam generator for which manufacturer has predefined the parameters. The relative influence of the foam parameters and optimization of factors were carried out through a systematic experiment design. The foam production parameters namely foam generation pressure and dilution ratio of foaming agents are observed to have significant effect on all foam characteristics with the exception of foam output rate on which only foam generation pressure has influence. The foam with good initial foam density need not necessarily be stable foam. The optimum levels of foam production parameters are determined for the surfactant Sodium lauryl sulfate which can be used to produce stable foam for foam concrete production.

Analysis of the Foam Generated Using Surfactant Sodium Lauryl Sulfate

Ranjani, G. Indu Siva,Ramamurthy, K. Korea Concrete Institute 2010 International Journal of Concrete Structures and M Vol.4 No.1

The performance evaluation of a sodium lauryl sulfate to qualify as a foaming agent is presented in this paper. When new surfactants are used a systematic study of production parameters on the foam characteristics needs to be undertaken unlike proprietary foaming agents and foam generator for which manufacturer has predefined the parameters. The relative influence of the foam parameters and optimization of factors were carried out through a systematic experiment design. The foam production parameters namely foam generation pressure and dilution ratio of foaming agents are observed to have significant effect on all foam characteristics with the exception of foam output rate on which only foam generation pressure has influence. The foam with good initial foam density need not necessarily be stable foam. The optimum levels of foam production parameters are determined for the surfactant Sodium lauryl sulfate which can be used to produce stable foam for foam concrete production.

Influence of amphiphile on foam stability of Al2O3-SiO2 colloidal suspension to porous ceramics

Naboneeta Sarkar,박정규,서동남,Sangram Mazumder,Ashish Pokhrel,Christos G. Aneziris,김익진 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4

The stabilization of wet foam is very important to avoid the instability caused by the large interfacial area at gas-liquid interface of colloid suspension. Propionic acid, a short chain carboxylic acid is used as foam stabilizer, which acts by modifying the particle surface and increases the wet foam stability. The characterization of Al2O3-SiO2 foams, namely Laplace pressure, foam stability, air content and bubble size are explored by changing the concentration of the amphiphile. Macroporous Al2O3- SiO2 ceramics with open or closed cells, average pore size of less than 100 μm and porosities within 43 and 51% was prepared by direct foaming process. The sample sintered at 1300 ℃ for 1 hour showed an adsorption free energy of 0.9 × 107 to 2.0 × 108 kTs and a Laplace pressure of 0.63 to 0.85 mPa, highlighting good wet foam stability of approximately 80-90%.

경량 기포 콘크리트의 레올로지 특성이 소포억제에 미치는 영향

이향선,전종운,조무진,기성훈,한동엽 한국건설순환자원학회 2018 한국건설순환자원학회 논문집 Vol.6 No.4

The aim of the research is to provide possibility of quality controlling by rheological properties for lightweight foamed concrete. The lightweight foamed concrete achieves its low density by containing air bubbles (foam) produced during the mixing process. Therefore, containing foamed volume during setting period is critical for the securing the performance as an insulating material. In this research, regarding foam collapse during the setting period, rheolgocial properties of fresh state lightweight foamed concrete were assessed to get its relationship with volume stability, or foam stability. For the experiment regarding foaming factors including mixing time, mix design of contents for materials, rheological properties of fresh state lightweight foamed concrete were tested with its density and settling depth. Based on the settling depth with various factors, relationship with rheological properties was analyzed, and especially, close relationship of plastic viscosity and settling depth was found. Therefore, from the results of this research, it is considered to contribute on suggesting a new approach of quality controlling for lightweight foamed concrete using rheological test method.

Effect of surfactant on wet foam stability to SiC porous ceramics

Woo Young Jang,Jung Gyu Park,In-Sub Han,Hyung Mi Lim,Tae Young Lim,김익진 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.12

The stabilization of wet foam is an important parameter for obtaining a large volume of dried foams in porous ceramics. Octalymine (CH3(CH2)7NH2) is used as a foam stabilizer, which modifies the particle surface, improves the colloidal andrheological properties of the suspension, improving the wet foam stability with a tailored bubble size. The characterization ofSiC foams, including the contact angle, surface tension and adsorption free energy, Laplace pressure, foam stability, aircontent, bubble size, and relative bubble size are explored by changing the concentration of the ampliphile. Adsorption freeenergy of 1.5 × 10−15 J to nearly 1.4 × 10−14 J, and Laplace pressure of 0.52 mPa to 0.25 mPa, good wet foam stability of morethan 80%, was prepared by direct foaming. Macroporous SiC ceramics with open or closed cells, an average pore size of 350 µm,41.5% porosity and compressive strength up to 0.7 MPa were obtained when the sample was sintered at 2150 oC for 1 hr.

Impact of SiC colloidal suspension properties for the fabrication of highly porous ceramics

Bijay Basnet,Woo Young Jang,Jung Gyu Park,In-Sub Han,Tae Young Limc,Hyung Mi Lim,김익진 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9

This study discusses the impact of colloidal suspension properties on the wet foam stability of porous ceramics obtained by direct foaming from a particle-stabilized colloidal suspension. The influence of binder content on the wet foam stability interms of rheology, surface tension, average bubble size and air content are reported. The partial hydrophobization of colloidal suspension was carried out by applying Octylamine as surfactant. PEG binder was added as a wet foam stabilizer. The results shows the wet foam stability of more than 90%, which corresponds to an air content of 86.5% with a colloidal suspension containing 20 wt.% of binder. The Newtonian additive, binder decreases viscosity of colloidal suspension to create a favorable condition for wet foam stability. Uniform distribution of highly open/interconnected pores was controlled with an increase in the binder content of up to 20 wt.%, leading to a higher wet foam stability for porous ceramics.