Dodecylbenzenesulfonate Research Articles

Cleaning mechanisms during post chemical mechanical polishing (CMP) using particle removal of surfactants via a citric acid-based solution

With the development of circuit integration technology, the requirements for defects in copper interconnects have become more stringent. The residual SiO2 particles on the copper surface can seriously affect circuit performance and require more efficient and thorough removal. This article investigates the effects of a novel cleaning solution composed of citric acid (CA), alkyl polysaccharide glycosides (APG1214), and dodecylbenzene sulfonic acid (LABSA), aimed at improving the removal efficiency of SiO2 and maintaining the integrity of copper surface. The optimal concentrations of APG1214 and LABSA were determined through contact angle and surface tension analysis. It was found that when APG1214 (2000 ppm) and LABSA (1000 ppm) were combined in a 3:2 vol ratio in CA solution (0.6 wt%), the highest particle removal efficiency (99.5 %) could be achieved while minimizing surface roughness. The results of scanning electron microscopy (SEM) and atomic force microscopy (AFM) confirmed these findings. Combining quantum chemical calculations, new insights into the mechanism of action of different components in clean solutions have been proposed: 1. Similar to CA, LABSA and APG1214 demonstrate a strong affinity for copper, synergistically facilitating the cleavage of Cu-Si bonds. 2. Alternating adsorption of LABSA and APG1214 on free silica particles prevents their re-adsorption onto copper surfaces. 3. Furthermore, their orderly adsorption on copper mitigates the corrosive chelation effect of CA, providing a protective mechanism. These findings are pivotal for the development of advanced, multifunctional cleaning solutions.

Identification of Hydrocarbon Sulfonates as Previously Overlooked Transthyretin Ligands in the Environment.

Incidences of thyroid disease, which has long been hypothesized to be partially caused by exposure to thyroid hormone disrupting chemicals (TDCs), have rapidly increased in recent years. However, known TDCs can only explain a small portion (∼1%) of in vitro human transthyretin (hTTR) binding activities in environmental samples, indicating the existence of unknown hTTR ligands. In this study, we aimed to identify the major environmental hTTR ligands by employing protein Affinity Purification with Nontargeted Analysis (APNA). hTTR binding activities were detected in all 11 indoor dust and 9 out of 10 sewage sludge samples by the FITC-T4 displacement assay. By using APNA, 31 putative hTTR ligands were detected including perfluorooctanesulfonate (PFOS). Two of the most abundant ligands were identified as hydrocarbon surfactants (e.g., dodecyl benzenesulfonate). Moreover, another abundant ligand was surprisingly identified as a disulfonate fluorescent brightener, 4,4'-bis(2-sulfostyryl)biphenyl sodium (CBS). CBS was validated as a nM-affinity hTTR ligand with an IC50 of 345 nM. In total, hydrocarbon surfactants and fluorescent brighteners explain 1.92-17.0 and 5.74-54.3% of hTTR binding activities in dust and sludge samples, respectively, whereas PFOS only contributed <0.0001%. Our study revealed for the first time that hydrocarbon sulfonates are previously overlooked hTTR ligands in the environment.

Pushing Patterning Limits of Drop‐On‐Demand Inkjet Printing with Cspbbr3/PDMS Nanoparticles

AbstractPatterning is crucial for advancing perovskite materials into color conversion micro‐display applications, but achieving inkjet‐printed patterns with high performance and precision remains challenging. Here, novel CsPbBr3/PDMS nanoparticles as a promising candidate is proposed for achieving precise and perfect inkjet printing patterns. The as‐prepared nanoparticles ensure exceeding brightness, exceptional stability, uniform fluorescence emission, and high resolution reaching the highest performance of drop‐on‐demand inkjet printing. Specifically, the performance and stability of CsPbBr3/PDMS nanoparticles are enhanced through a two‐step optimization involving dodecyl benzene sulfonic acid (DBSA) ligand modification and polydimethylsiloxane (PDMS) in situ coating, resulting in the highest photoluminescence quantum yield (PLQY) of 92% among CsPbBr3/polymer core‐shell composites so far. The branched structure of DBSA and the PDMS shell provide steric hindrance and effectively prevent agglomeration during storage or patterning. The viscous PDMS coating inhibits the coffee ring effect, not only leading to excellent near‐unity uniform emission but also promoting the formation of smaller and more elaborate droplets, increasing the printing resolution by up to surprisingly 300%. Importantly, the impeccably displayed, high‐resolution patterns formed by versatile CsPbBr3/PDMS nanoparticles have demonstrated significant potential for high pixel density Micro‐LED displays, enabling efficient and stable color conversion.

Wettability of an electroactive membrane in surfactant-containing brine for conductive heating membrane distillation

Membrane distillation (MD) is a technology that has proven to be highly efficient in desalination. However, the occurrence of membrane wetting can lead to the failure of the process. Given this, we developed an electroactive membrane (RC-M) using carbon nanotubes and reduced graphene oxide. The wettability of RC-M was then examined after treatment with cationic or anionic surfactants in brines during the conductive heating membrane distillation process. Results indicated that the RC-M had an abundance of charged functional groups and multiple defects in the graphene structure. Using 0.3 mol/L NaCl and 30 mg/L sodium dodecylbenzenesulfonate (SDBS), the RC-M worked for 600 mins with 97.2 % rejection. While, in a feed with hexadecyltrimethylammonium bromide, rejection dropped to 93.6 % in 350 minutes. When a potential was applied to the RC-M, the SDBS displayed electrostatic repulsion when interacting with the membrane, thereby preventing its adsorption. Moreover, the interaction between the feed and the charged RC-M caused electrolysis, and the resultant bubbles helped reduce wetting. Additionally, the RC-M itself possessed a hydrophilic layer that aided in mitigating wetting. The findings of this research offer valuable understanding regarding the durability of MD membranes and techniques to postpone membrane wetting.

Fabrication, encapsulation and controlled release of multilayer capsule based on thermosensitivity and host‐guest interaction

AbstractAs an efficient means of material carrying, multilayer capsules are widely used in medicine, agriculture, food safety and other fields. Here, we report a kind of temperature‐triggered multilayer capsule with chitosan‐sodium dodecyl benzene sulfonate (CS‐SDBS) as the shell and gelatin bead containing α‐cyclodextrin (α‐CD@gelatin) as the core. The α‐CD@gelatin/CS‐SDBS multilayer capsules can simultaneously encapsulate various substances, such as drugs, fluorescent materials, and nanoparticles. The encapsulated substances do not interfere with each other because they are located in different layers. Both the temperature‐sensitive property of gelatin and the host‐guest interaction between α‐CD and SDBS are utilized to achieve temperature‐controlled release of substances in the multilayer capsules. The release rate can be adjusted by the α‐CD amount in the gelatin beads. The controlled drug release and chemical detection of the multilayer capsules are studied with sodium salicylate, iodine, and purple cabbage pigment as the carriers. The results show that the α‐CD@gelatin/CS‐SDBS multilayer capsules have excellent capabilities of encapsulation and controlled release, which are beneficial for their application in the fields of substance encapsulation, drug‐controlled release, and chemical detection.

Thin layer chromatography of methylated derivatives of sodium alkylbenzenesulfonates in water analysis by GC-MS

Sodium alkylbenzene sulfonates or linear alkyl benzene sulfonates (LAS) are the most common synthetic anionic surfactants and water pollutants. They can cause both acute and chronic toxic effects on water organisms. Selective determination of sodium alkylbenzene sulfonates as a separate class of anionic surfactants is possible using gas chromatography coupled with mass spectrometry (GC-MS) in the form of linear alkylbenzenesulfonic acid methyl esters (LABSA ME). In order to purify the extracts and concentrate the analytes, we studied the behaviour of these compounds by ascending high-performance thin-layer chromatography using Kieselgel 60 F254 and Sorbfil plates. A mixture of n-hexane and methanol solvents in a ratio of 23:1 (by volume) was used as the mobile phase. Under these conditions, sodium alkylbenzenesulphonates remain on the start line, while their derivatives (ME ABSC), obtained by methylation with trimethyl orthoformate in the presence of trifluoroacetic acid (with a yield of η=98%), form zones characterised by retention coefficient values of Rf = 0.62 and Rf = 0.71 on Kieselgel 60 F254 and Sorbfil plates, respectively. The repeatability of the Rf values was characterised by a standard deviation of 6.1 and 5.9 %, respectively (n=16). The completeness of extraction (95.0–100.0 %) of analytes from the plates by descending TLC with acetonitrile was noted. The applicability of the TLC method for the concentration of analytes and pretreatment of extracts on the example of real water samples was shown. Using GC-MS with electron impact ionisation, we determined the concentrations of sodium alkylbenzenesulphonates in water sampled in the southern basin of Lake Baikal from a depth of 400 m (0.24±0.02 µg/dm3) and in snowmelt water from the ice of the Krestovka River where it flows into Lake Baikal near the village of Listvyanka (31.1 ± 1.0 µg/dm3).

Extracellular polymeric substances (EPS)-involved photodegradation of sodium dodecyl benzene sulfonate (SDBS) via photo-generated reactive intermediates (RIs)

Extracellular polymeric substances (EPS) produced by microorganisms are ubiquitous in natural and engineered aquatic systems, but limited research has been conducted on the photosensitivity of EPS for degrading organic pollutants. The degradation of sodium dodecylbenzene sulfonate (SDBS), a typical organic pollutant in natural aquatic environments, is closely associated with biofilms; however, the indirect photodegradation of SDBS by photosensitized reactive intermediates (RIs) of EPS remains unclear. Here, we extracted three types of EPS (soluble state-SEPS, loosely bound-LB-EPS, and tightly bound-TB-EPS) from biofilms from cultured biofilms to evaluate their photoactivities in generating RIs under irradiation and photodegradation mechanism of SDBS. We found that TB-EPS exhibited higher aromaticity, molecular weight and nitrogenous compound concentration, whereas SEPS and LB-EPS had higher proportion of CHO-like substances than TB-EPS did. The steady-state concentrations of 3DOM*, ·OH, and 1O2 for EPS solutions varied depending on the degree of attachment to the biofilm; specifically, looser attachment resulted in higher efficiency in generating RIs. EPS effectively facilitated the degradation of SDBS through RIs, with 1O2 contributing significantly. Products analysis demonstrated that RIs attacked the sulfonic acid groups within SDBS − possessing strong electron-donating ability − leading to benzene ring opening as well as oxidation-induced breakdown into low-molecular-weight substances. This study elucidates the intricate structure and photochemical properties of EPS, while also delving into the mechanistic role of RIs in the degradation of SDBS. These findings hold significant implications for enhancing the efficiency of organic pollutant photodegradation and broadening the application scope of photocatalytic technology.

Development and mechanism research of hydrophobic associative polymer drag reducing agents

ABSTRACT The challenge of insufficient proppant transportation capacity in slick water remains unresolved. To tackle this concern, a hydrophobically associating water-soluble polymer (HAWP), characterized by a low molecular weight (MW) of 8.11 × 105 g/mol, was successfully synthesized via a photo-initiation method. The drag reduction mechanism of the material was characterized through nuclear magnetic resonance and rheological performance testing. The drag reduction mechanism of the material was characterized through nuclear magnetic resonance and rheological performance testing. The results show that in comparison to conventional drag reducers in slick water with an average MW of approximately 1 × 107 g/mol, HAWP demonstrates significantly reduced MW. The rheological test results indicate that upon addition of sodium dodecyl benzene sulfonate (SDS, 200 mg/L) to the HAWP solution (0.3 wt%), the storage modulus experienced a substantial increase from 0.14 Pa to 7.42 Pa, demonstrating enhanced mechanical properties. Meanwhile, drag reduction (DR) tests showed that the efficiency of drag reduction achieved by the polymer system (PS) drag reducer was comparable to that of conventional linear polymers. This research achievement effectively addresses the challenges of low molecular weight and resistance reduction encountered in previous endeavors.

Synergistic effects of microplastic stability and adsorption rate on co-transport of microplastics and Pb under surfactant

The emergence of microplastics (MPs) and their coexistence with heavy metal contaminants pose potential risks to the safety of the subsurface environment and public health. Therefore, it is crucial to explore the co-transport of MPs (polypropylene (PP), polyethylene (PE), polystyrene (PS), polymethyl methacrylate (PMMA) and polytetrafluoroethylene (PTFE)) with the heavy metal Pb(II) under the surfactant (sodium dodecyl benzene sulfonate (SDBS) and cetyltrimethylammonium bromide (CTAB)). In this study, column experiments were performed to investigate the co-transport of MPs and Pb(II) under surfactants. The co-transport mechanism of MPs with Pb(II) under surfactant was revealed by MPs stability and batch adsorption experiments. Experimental results showed that the presence of Pb(II) did not influence the mobility of MPs under CTAB and SDBS; however, MPs can affect the mobility of Pb(II). Specifically, under CTAB, the MPs increased the recovery rate of Pb(II) from 86% to 87.55%–97.55%. However, under SDBS, the high mobility of PS, PE, and PP inhibited the transport of Pb(II), and the recoveries of Pb(II) decreased from 79% to 57.53%–70.96%. The low mobility of PTFE and PMMA slightly promoted the transport of Pb(II). This could be attributed to two reasons. One aspect is the adsorption rate of Pb(II) by MPs, which plays a pivotal role in influencing the transport tendency of Pb(II) with MPs. Another aspect is the MPs stability, as greater stability enhances their dispersity and accelerates the adsorption rate of Pb(II), thereby facilitating the co-transport of Pb(II) with MPs. This study could provide valuable insights for assessing the transport and environmental impact of MPs and heavy metals in the presence of surfactants.

Synthesis and structure–property relationship of coal-based isomeric alkylbenzene sulfonate surfactants

Using coal resources to synthesize high-value surfactants is effective for clean coal utilization and low-carbon conversion, attracting more attention from academia and industry. Herein, three coal-based isomeric alkylbenzene sulfonate surfactants were successfully synthesized via sulfonation with gas phase SO3 utilizing isomeric alkylbenzenes, derived from the alkylation of benzene and Fischer–Tropsch synthesized α-olefins, as raw materials in a microchannel reactor. Moreover, their surfactant properties were systematically investigated to reveal the structure–property relationship. The results indicated that the equilibrium surface tension (γCMC) for the synthesized surfactants was reduced with the increase of the degree of hydrophobic tails branching, and the order of γCMC was: sodium dodecylbenzene sulfonate (35.67 mN·m−1) > sodium C6 olefin dimer alkylbenzene sulfonate (34.18 mN·m−1) > sodium dihexylalkylbenzene sulfonate (29.94 mN·m−1). Sodium dihexylalkylbenzene sulfonate with the lower γCMC exhibited superior wettability (the contact angle of 50.2 ° at 30 s) and excellent emulsifying capacity (emulsification time of 1337 s) at the corresponding critical micelle concentration. This study provides new insights into rational design of hydrophobic tail architectures of surfactant molecules to meet specific needs in various fields.

Epoxy/polymercaptan microcapsules composite: Synthesis, mechanics, and self-healing behavior

To enhance the longevity of materials, minimize maintenance expenses, and optimize material performance. The wall material employed in this study was urea-melamine-formaldehyde (UMF), and a dual microcapsule self-healing system was established by synthesizing two distinct microcapsules of epoxy resin and polymercaptan via an in situ polymerization technique. Moreover, the reaction conditions were optimized. The reaction parameters were as follows: core-shell ratio of 2:1, surfactant concentration of 0.6 g/L (sodium dodecyl benzene sulfonate (SDBS): Arabic gelatin (GA) = 2:1), polymerization pH = 3.5, stirring rate of 700r/min. Then, the two microcapsules (The mass ratio of the two microcapsules is 1:1) were added to the epoxy resin matrix at 0, 2.5, 5, 7.5, 10, and 12.5 wt% to prepare the resin matrix with self-healing properties. The conical double cantilever beam (TDCB) was used to test the mechanical properties of the matrix. The results showed that the matrix with microcapsule content of 10 wt% had relatively better comprehensive properties, and the self-healing rate was 49.87% at room temperature. These findings provide valuable insights and potential for advancing the development of self-healing materials.

Modulation of metal-organic frameworks by anionic surfactants for rapid adsorption of organic pollutants bisphenol A and chrome black T

With the accelerated development of industry, which generates large quantities of sewage discharged into the aquatic environment, serious impacts on both environmental and human health. Detecting various organic contaminants in water sources has become common, presenting huge challenges for water treatment. Metal-organic frameworks are characterized by their rich porous structures and high chemical activity, making them ideal adsorbents for removing organic pollutants from water. In this study, sodium dodecylbenzene sulfonate is added to the precursor solution of MIL-101(Cr)-Cl2 and synthesized hierarchical porous structure adsorbents MIL-SDBS-X, using hydrothermal synthesis to enhance their adsorption capacity, making efficient and rapid removal of bisphenol A(BPA) and chromium black T(EBT), two common organic pollutants in water, which MIL-SDBS-0.7 was the most effective. MIL-SDBS-0.7 exhibites great potential in the adsorption of BPA and EBT for its high adsorption capacity (260.5 mg-1·g-1 and 272.3 mg-1·g-1) and rapid adsorption (equilibrium could be achieved in 15 minutes), The findings reveal adsorption kinetics aligns with the pseudo-second-order model and the Langmuir equation best fits to study adsorption of MIL-SDBS-0.7 to BPA and EBT. Thermodynamic parameters affirm the exothermic and higher spontaneity behavior of the adsorption process. Moreover, the adsorption mechanism of MIL-SDBS-0.7 was explored, illustrating the crucial roles of effects of hydrogen bonding π-π stacking and pore filling in the adsorption of BPA and EBT. Therefore, this work not only provided a convenient strategy for the preparation of efficient and fast MIL-SDBS-0.7 hierarchical porous material but also highlighted the promising potential of synthesized absorbents as an effective adsorbent for organic pollutants in wastewater treatment and environmental remediation.

Boron-doped reduced graphene oxide as an efficient cathode in microbial fuel cells for biological toxicity detection

Electrodes with superior stability and sensitivity are highly desirable in advancing the toxicity detection efficiency of microbial fuel cells (MFCs). Herein, boron-doped reduced graphene oxide (B-rGO) was synthesized and utilized as an efficient cathode candidate in an MFCs system for sensitive sodium dodecylbenzene sulfonate (SDBS) detection. Boron doping introduces additional defects and improves the dispersibility and oxygen permeability, thereby enhancing the oxygen reduction reaction (ORR) efficiency. The B-rGO-based cathode has demonstrated significantly improved output voltage and power density, marking improvements of 75 % and 58 % over their undoped counterparts, respectively. Furthermore, it also exhibited remarkable linear sensitivity to SDBS concentrations across a broad range (0.2–15 mg/L). Notably, the cathode maintained excellent stability within the test range and showed significant reversibility for SDBS concentrations between 0.2 and 3 mg/L. The highly sensitive and stable B-rGO-based cathode is inspiring for developing more practical and cost-effective toxicant sensing devices.

The effect of modified oily sludge on the slurry ability and combustion performance of coal water slurry

Abstract The aim of this study is to find a solution to the challenging problem of disposing oily sludge (OS). Three different types of modifiers, namely, sodium hydroxide (NaOH), sodium dodecylbenzene sulfonate (SDBS), and polyoxyethylene polyoxypropylene polyether (AE) were employed for the simple modification of OS. The influence of modified OS on slurry ability and combustion performance were investigated. The results showed that OS modified by NaOH and SDBS can increase the concentration of coal OS slurry. However, the influence of AE modification on slurry concentration is intricate. In terms of combustion performance, the change in activation energy results in NaOH and SDBS modifications decrease T i and T h of coal OS slurry, while AE modification increases T i and T h of coal OS slurry.

Performance of a Composite Inhibitor on Mild Steel in NaCl Solution: Imidazoline, Sodium Molybdate, and Sodium Dodecylbenzenesulfonate

Mild steel corrosion is a significant challenge in oil and gas exploitation. Inhibitors are frequently employed to minimize the corrosive impact on mild steel. Mixing corrosion inhibitors is an effective method in reducing the dosage of toxic compounds and expanding the potential applications of inhibitors in NaCl solutions. Herein, a mixed corrosion inhibitor composed of imidazoline (IM), sodium molybdate, and sodium dodecylbenzenesulfonate (SDBS) for mild steel in a 3.5 wt% NaCl solution are investigated by orthogonal experimental design and electrochemical measurement. The imidazoline compound was synthesized and identified using Fourier transform infrared (FTIR) spectroscopy. The inhibitory effect is improved by higher concentrations of sodium molybdate and is further enhanced with the addition of 10 mg/L of SDBS. The electrochemical impedance spectroscopy indicates that the combination of IM (100 mg/L), sodium molybdate (50 mg/L), and SDBS (100 mg/L) results in excellent performance with electrochemical impedance (1.8 kohm·cm2). The mild steel surfaces after electrochemical measurement were analyzed using scanning electron microscopy (SEM). The information can contribute to the development of corrosion inhibitors with high performance or to understand the influence of mixing inhibitors on corrosion processes of mild steels.

PVA/PANI-DBSA Nanomesh Tactile Sensor for Force Feedback.

Touch serves as an important medium for human-environment interaction. The piezoresistive tactile sensor has attracted much attention due to its convenient technology, simple principle, and convenient signal acquisition and analysis. In this paper, conductive beads-on-string polyvinyl alcohol (PVA)/polyaniline doped with dodecyl benzene sulfonic acid (PANI-DBSA) nanofibers were fabricated via the electrospinning technique. Due to the special nanostructure of PVA-coated PANI-DBSA, the tactile sensor presented a wide measuring range of 12 Pa-121 kPa and appreciable sensitivity of 8.576 kPa-1 at 12 Pa~484 Pa. In addition, the response time and recovery time of the sensor were approximately 500 ms, demonstrating promising prospects in the field of tactile sensing for active upper limb prostheses.

Effect of DBSA‐doped PANI on the corrosion protection performance of GO/epoxy coatings

AbstractIn this study, the anticorrosion effect of polyaniline doped with dodecyl benzene sulfonic acid (PANI‐DBSA) in graphene oxide (GO)/epoxy coating is investigated. PANI‐DBSA is effectively synthesized on the surface of GO via chemical polymerization, and its properties are investigated via a series of characterization methods. The PANI‐DBSA/GO hybrid exhibits improved compatibility with organic resin. The anticorrosion performance of PANI‐DBSA/GO coatings is assessed through water absorption tests, electrochemical impedance spectroscopy measurements, and adhesion strength tests. The results indicate that PANI reduces the water absorption of GO, and the favorable compatibility of PANI‐DBSA/GO with epoxy resin minimizes coating defects and enhances the interfacial blocking for diffusion electrolytes. In this work, the PANI has no active function such as passivating the metal surface, it just serves to shield the hydrophilic GO surface and to improve compatibility between GO and the epoxy, attributing its low pigment content.

Tuning the mechanical and thermoelectric properties of self‐standing stretchable PEDOT:PSS/SDBS films

AbstractPoly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has recently attracted significant attention as a potential candidate for small‐scale thermoelectric conversion because of its ease of doping, and solution processability. This study addressed the fabrication of self‐standing PEDOT:PSS films modified with sodium dodecylbenzene sulfonate (SDBS) surfactant, presuming different annealing temperatures. According to the investigation, optimizing the annealing temperature improves crystal quality and increases the efficiency of PEDOT:PSS films. The resulting PEDOT:PSS films showed the highest electrical conductivity of about 623.68 Scm−1 and maximum power factor of 25.87 μWm−1 K−2. In addition to confirming thermoelectric properties; SDBS surfactants are being investigated to plasticize PEDOT:PSS films at different concentrations and annealing temperatures. With an optimization in annealing temperature, the elongation at break value similarly improves; and the highest elongation at break was observed at 0.94 wt% SDBS concentration, reaching 32%. To completely understand the underlying reasons for this dependence, higher‐order structures and electronic states of polymer films have been examined using electronic reflectance spectroscopy and X‐ray diffraction analysis. Overall, the outcomes of this work show how important surfactants and their annealing temperature are for improving the mechanical and thermoelectric characteristics of self‐standing PEDOT:PSS films.

Enzyme stability with essential oils and surfactants. Growing towards green disinfectant detergents

This study investigates the stability of α-amylase and protease in disinfectant formulations incorporating essential oils (EOs), anionic surfactants (linear alkylbenzene sulfonate), non-ionic surfactants (alkylpolyglucosides and ethoxylated fatty alcohols), and mixtures of them, analysing the influence of the composition, temperature, and time using shelf-life assays. EOs reduce α-amylase activity showing first-order deactivation kinetics, and surfactants were found not to significantly affect its activity. However, protease activity increases with the presence of EOs, and it was also observed that the use of surfactants does not significantly affect protease activity either. This work represents a step forward in the development of environmentally friendly multifunctional detergents with high disinfectant and detersive capacity.

Investigation on the enhanced ion impermeability of bipolar corrosion resistant coating prepared with Mg/Al-HT

Hydrotalcite (HT), which contains a large amount of easily exchanged hydroxyl groups, and has attracted great attention in the field of corrosion protection. Taking this aspect into consideration, this study has prepared bipolar corrosion resistant coating with modified magnesium-aluminum synthetic hydrotalcite (Mg/Al-HT), which restrains both the anion and cation migration in the coating. It is achieved by applying sodium dodecylbenzene sulfonate (SDBS) and cetyltrimethylammonium bromide (CTAB) to modify Mg/Al-HT and blending with phenolic epoxy resin. The chemical composition and morphology of the modified Mg/Al-HT are analyzed using SEM, FT-IR, and Raman spectroscopy. The ion selectivity of the prepared coating is evaluated with membrane potential test. Observation of the macroscopic pictures revealed that no corrosion products were observed on the surface of the bipolar coating after 60 days of immersion in 3.5 wt% NaCl solution. The corresponding interfacial impedance behavior is investigated. The typical impedance modulus @0.01 Hz remains constant at about 109 Ω cm2 after 60 days of exposure in 3.5 wt% NaCl solution, which is 102-103 times higher than that of the conventional coating. The mechanism of the enhanced ion impermeability is discussed in the paper.