scholarly journals Effects of foaming agent on properties of foamed gel

2020 ◽  
Vol 29 ◽  
pp. 096369351988164
Author(s):  
Qing Cao ◽  
Jian-jun Shen ◽  
Wen-jie Guo
Keyword(s):  
Cross Linking ◽  
Ammonium Bromide ◽  
Foam Expansion ◽  
Foaming Agent ◽  
Foaming Agents ◽  
Foam Stabilizer ◽  
Foaming Property ◽  
Starting Point ◽  
Dodecyl Trimethyl Ammonium Bromide ◽  
The Stability

To improve foam expansion and the stability of the foamed gel selected as the starting point, three foaming agents with relatively higher foam expansion and three foam stabilizers were used to determine optimum gradient and composition of the gel. Sodium laurate and dodecyl trimethyl ammonium bromide at a proportion of 2:3 were observed to produce the desirable foaming property and also created the largest foaming volume after the addition of 0.2% polyethylene glycol as the foam stabilizer. Different concentrations of gelatinizing and cross-linking agents were added to the foamed gel containing the foaming agent and the foam stabilizer. The most suitable ratio of the gelatinizing agent and the cross-linking agent determined on the basis of volume of foam dewatering after the addition of foam stabilizer for 6 h was 0.6%:0.5%. The resulting foamed gel was evaluated for rheological and plugging properties and a decrease in the viscosity of the gel and better plugging effect on coal seam were observed.

scholarly journals THE INFLUENCE OF THE FOAMING AGENTS NATURE ON PHYSICAL AND TECHNICAL PROPERTIES OF FOAM

2018 ◽  
Vol 3 (3) ◽  
pp. 5-12 ◽  
Author(s):  
Александр Попов ◽  
Aleksandr Popov ◽  
В.В. Нелюбова ◽  
Viktoriya Nelyubova ◽  
Д. Нецвет ◽  
...  
Keyword(s):  
Foam Expansion ◽  
Foaming Agent ◽  
Foaming Agents ◽  
Technical Properties ◽  
The Stability ◽  
Optimum Working

The paper considers the influence of the nature of foaming agent on the properties of foams. Based on the analysis of the market of modern pore-forming additives, from the number of foaming agents the most widely used components, as well as novelties of the market, have been chosen. The technical characteristics of the foaming agents provided on the market are reviewed. The influence of foaming agent concentration, composition and base on the foam expansion, stability and density of foams is studied in the paper. The optimum ("working") concentrations of foaming additives are determined taking into account their stability. The stability of foams formed on the basis of working solutions in porous systems of various compositions is studied. Based on the complex of studies, the protein foaming agents are ranked according to the degree of their effectiveness, according to the data on the physical and technical properties of foams obtained on their basis.

Spontaneous Formation of DTAB/SDBS Vesicles

2013 ◽  
Vol 734-737 ◽  
pp. 2505-2508
Author(s):  
Lin Lin Cui ◽  
Hua Nan Guan
Keyword(s):  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Ammonium Bromide ◽  
Benzene Sulfonate ◽  
Complex Formulation ◽  
Structure And Morphology ◽  
Spontaneous Formation ◽  
Dodecyl Benzene Sulfonate ◽  
Dodecyl Trimethyl Ammonium Bromide ◽  
The Stability

Dodecyl trimethyl ammonium bromide/sodium dodecyl benzene sulfonate (DTAB/SDBS) complex formulation of scale effect on the spontaneous formation of vesicles and the influence of different factors on the stability of vesicles were discussed, structure and morphology of vesicles were observed.

Spontaneous Formation of DTAB/SLS Vesicles

2014 ◽  
Vol 881-883 ◽  
pp. 734-737
Author(s):  
Jian Sun ◽  
Hong Yun Li ◽  
Dong Hui Li ◽  
Bing Shao ◽  
Lin Lin Cui
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Scale Effect ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Complex Formulation ◽  
Structure And Morphology ◽  
Spontaneous Formation ◽  
Dodecyl Sulfate ◽  
Dodecyl Trimethyl Ammonium Bromide ◽  
The Stability

Dodecyl trimethyl ammonium bromide/sodium dodecyl sulfate (DTAB/SLS) complex formulation of scale effect on the spontaneous formation of vesicles and the influence of different factors on the stability of vesicles were discussed, structure and morphology of vesicles were observed.

scholarly journals Aerated Concrete Produced Using Locally Available Raw Materials

2017 ◽  
Vol 3 (4) ◽  
pp. 214-220 ◽  
Author(s):  
Faris Matalkah ◽  
Harsha Bharadwaj ◽  
Anagi Balachandra ◽  
Parviz Soroushian
Keyword(s):  
Thermal Conductivity ◽  
Raw Materials ◽  
Building Construction ◽  
Early Age ◽  
Foaming Agent ◽  
Foam Structure ◽  
Foaming Agents ◽  
Aerated Concrete ◽  
Concrete Materials ◽  
The Stability

Aerated concrete materials were developed with abundant natural materials. Aerated concrete can provide insulating qualities complemented with secondary structural attributes when used as core in sandwich composites for building construction. A hybrid binder that comprised lime and gypsum was used. Different foaming agents were considered for production of aerated concrete, including saponin that is found abundantly in different plants. Different formulations were considered, and the stability of the foam structure as well as the density and early-age compressive strength of the resulting aerated concrete were evaluated. One formulation comprising lime-gypsum binder with saponin foaming agent, with a density of 0.53 g/cm3, was further characterized through performance of thermal conductivity, split tension, flexure, elastic and shear modulus and sorptivity tests. The results pointed at the satisfactory balance of qualities provided by the aerated concrete when compared with alternative aerated concrete materials.

scholarly journals Determination of the Influence of Hydraulic Additives on the Foaming Process and Stability of the Produced Geopolymer Foams

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5090
Author(s):  
Michał Łach ◽  
Kinga Pławecka ◽  
Agnieszka Bąk ◽  
Katarzyna Lichocka ◽  
Kinga Korniejenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Polyurethane Foams ◽  
Expanded Polystyrene ◽  
Foaming Agent ◽  
Foaming Agents ◽  
Foaming Process ◽  
Al Powder ◽  
The Stability

The research described in this article was aimed at determining the influence of hydraulic additives on the foaming process and the stability of the produced geopolymer foams. These foams can be used as insulation materials to replace the currently commonly used insulations such as expanded polystyrene or polyurethane foams. Geopolymers have low thermal conductivity, excellent fire- and heat-resistant properties, and have fairly good mechanical properties. Research on foamed materials shows that they have the highest class of fire resistance; therefore, they are most often used as insulation products in construction. Geopolymer foams were made of aluminosilicate materials (fly ash) and foaming agents (H2O2 and Al powder), and the stabilizers were gypsum and portland cement. Additionally, surfactants were also used. It was found that better foaming effects were obtained for H2O2—it is a better foaming agent for geopolymers than Al powder. When using a hydraulic additive—a stabilizer in the form of cement—lower densities and better insulation parameters were obtained than when using gypsum. Portland cement is a better stabilizer than gypsum (calcium sulfates), although the effect may change due to the addition of surfactants, for example.

Functional surfaces produced by foam coating

TAPPI Journal ◽  
2016 ◽  
Vol 15 (8) ◽  
pp. 515-521 ◽  
Author(s):  
EIJA KENTTÄ ◽  
HANNA KOSKELA ◽  
SARA PAUNONEN ◽  
KARITA KINNUNEN-RAUDASKOSKI ◽  
TUOMO HJELT
Keyword(s):  
Life Time ◽  
Silica Coating ◽  
Foaming Properties ◽  
Coated Paper ◽  
Paper Properties ◽  
Foaming Agent ◽  
Foaming Agents ◽  
Size Stability ◽  
Stability Measurement ◽  
Standard Paper

This paper reports experiments on silica coating formulations that are suitable for application as a thin pigment layer with foam coating technique on a paper web. To understand the foaming properties of nanosilica dispersions, the critical micelle concentration, foam half-life time, and foam bubble size stability were determined with three different foaming agents. The results indicate that the bubble stability measurement is a useful characterization method for foam coating purposes. Pilot foam coating trials were done and the effects of the chosen foaming agents were studied on the properties of the nanosilica-coated paper. The surface hydrophilicity of silica coated paper was related not only to silica pigment, but also to the chemical nature of the foaming agent. Standard paper properties were not affected by the thin silica coating.

scholarly journals A new expansion material used for roof-contacted filling based on smelting slag

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hua Na ◽  
Guocheng Lv ◽  
Lijuan Wang ◽  
Libing Liao ◽  
Dan Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Peroxide ◽  
Compressive Strength ◽  
Sodium Silicate ◽  
Utilization Rate ◽  
Ammonium Bromide ◽  
Foaming Agent ◽  
Copper Nickel ◽  
Smelting Slag ◽  
Nickel Smelting

AbstractThe improper handling of smelting slag will seriously pollute the environment, and the unfilled roof of the goaf of the mine will threaten the safety of the mine. Expansion materials have attracted more and more attention because of their excellent properties. In this paper, copper-nickel smelting slag that has some active ingredients of gelling is used instead of traditional aggregate and some part of cement in order to reduce its pollution to the environment and its costs. For safety reasons, hydrogen peroxide was chosen as the foaming agent. Sodium silicate and hexadecyl trimethyl ammonium bromide (CTAB) are used as additives. Our results showed that after 28 days of curing, the material has better mechanical properties and the early compressive strength of the material was enhanced by sodium silicate. The efficiency of foaming was improved by CTAB. It also proves that copper–nickel smelting slag can be used in expansion material. At the same time, the utilization rate of the copper–nickel smelting slag of this formula can reach 70%, reduce its pollution to the environment.

scholarly journals An estimation on the mechanical stabilities of SAMs by low energy Ar+ cluster ion collision

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. Tong ◽  
G. R. Berdiyorov ◽  
A. Sinopoli ◽  
M. E. Madjet ◽  
V. A. Esaulov ◽  
...  
Keyword(s):  
Electron Irradiation ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Crystal Surface ◽  
Depth Profiling ◽  
Low Energy ◽  
Cross Linking ◽  
Xps Spectra ◽  
Self Assembled ◽  
The Stability

AbstractThe stability of the molecular self-assembled monolayers (SAMs) is of vital importance to the performance of the molecular electronics and their integration to the future electronics devices. Here we study the effect of electron irradiation-induced cross-linking on the stability of self-assembled monolayer of aromatic 5,5′-bis(mercaptomethyl)-2,2′-bipyridine [BPD; HS-CH2-(C5H3N)2-CH2-SH] on Au (111) single crystal surface. As a refence, we also study the properties of SAMs of electron saturated 1-dodecanethiol [C12; CH3-(CH2)11-SH] molecules. The stability of the considered SAMs before and after electron-irradiation is studied using low energy Ar+ cluster depth profiling monitored by recording the X-ray photoelectron spectroscopy (XPS) core level spectra and the UV-photoelectron spectroscopy (UPS) in the valance band range. The results indicate a stronger mechanical stability of BPD SAMs than the C12 SAMs. The stability of BPD SAMs enhances further after electron irradiation due to intermolecular cross-linking, whereas the electron irradiation results in deterioration of C12 molecules due to the saturated nature of the molecules. The depth profiling time of the cross-linked BPD SAM is more than 4 and 8 times longer than the profiling time obtained for pristine and BPD and C12 SAMs, respectively. The UPS results are supported by density functional theory calculations, which show qualitative agreement with the experiment and enable us to interpret the features in the XPS spectra during the etching process for structural characterization. The obtained results offer helpful options to estimate the structural stability of SAMs which is a key factor for the fabrication of molecular devices.

COO vs ROO: importance of the origin in customer preferences towards financial entities

2017 ◽  
Vol 34 (2) ◽  
pp. 206-223 ◽  
Author(s):  
José Manuel García-Gallego ◽  
Antonio Chamorro Mera
Keyword(s):  
Brand Management ◽  
Preference Structure ◽  
Content Type ◽  
Services Sector ◽  
Customer Preferences ◽  
Starting Point ◽  
Remarkable Result ◽  
Place Of Origin ◽  
Regional Brand ◽  
The Stability

Purpose The purpose of this paper is to determine the importance that customers give to the origin attribute when selecting a financial entity compared to other features directly related to the service that these institutions provide. In addition, this study aims at analysing what level of brand origin provides a greater utility for customers in their preference structure: regional, national or foreign. Design/methodology/approach The technique of conjoint analysis is applied via a survey of 427 customers to determine customers’ preference structure when choosing a financial entity. Findings Of particular note among the main results is the great importance the respondents give to the origin of the entity, preferring regional over national or foreign institutions. The existence of three different segments of customers based on their preference structure is also a remarkable result. Research limitations/implications Place-of-origin effect is not universal. Due to this fact, the results of the studies focussed on this research topic are difficult to extrapolate to other geographical areas. Practical implications The current situation in southern Europe financial sector obliges many small financial entities to undertake mergers in order to face the stability and solvency policies established by European Central Bank. In this sense, these institutions must decide whether or not to maintain their regional brand identity. The results of this study show the appropriateness of maintaining and communicating the regional origin of the entities. These findings will contribute to guiding decision making on brand management for financial entities. Originality/value To the best of the knowledge, there is a lack of research on the place-of-origin through different levels simultaneously. This paper provides a starting point for further research about this effect in the services sector.

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