Protective property of epoxy coatings containing polyaniline and laminar basalt in neutral, alkaline, and acidic media
It is very important to develop high performance composite coatings for efficient protection of metals from corrosion. In this work, high performance protection coatings on mild steel using epoxy as matrix containing polyaniline (PANI) and a newly developed laminar basalt (LB) were prepared and characterized. The contact angle, water absorption, adhesion strength, and passive property of the coating were also evaluated. The protection ability of these coatings on mild steel, exposed to 12 wt% sodium chloride (NaCl), 10 wt% sodium hydroxide (NaOH), and 10 wt% hydrochloric acid (HCl) solutions were monitored using electrochemical impedance spectroscopy (EIS), respectively. In neutral solution, the coating containing both PANI and LB (C‐PANI‐LB) offered very high corrosion protection performance and its impedance at 0.01 Hz was higher than 4.1 × 1010 Ω · cm2 after immersed for 60 days. However, in alkaline or acidic solution, C‐PANI‐LB behaved poorer than pure epoxy coating or PANI contained coatings, which were ascribed to the hydrolysis of LB and deterioration of the epoxy binder in these media.
Protective coatings incorporated with platelike inorganic fillers usually exhibit substantial enhancement in physical and chemical properties, including thermal stability, flame retardance, barrier resistance and stress corrosion prevention. The pathway of oxygen and other corrosion media through the coating matrix are prolonged intensively when the LBs are nearly parallel arranged in coating surface.
P. He, J.‐X. Wang, Q. Ma, F.‐Y. Lu, Z. Wang, S.‐C. Wang
Congenital myasthenic syndromes (CMS) are heterogeneous disorders in which the safety margin of neuromuscular transmission is impaired by one or more specific mechanisms. Since the advent of next‐generation sequencing methods, the discovery of novel CMS targets and phenotypes ha ... more
Myasthenia gravis (MG) with antibodies to muscle‐specific kinase (MuSK) is characterized by fluctuating fatigable weakness. In MuSK MG, involvement of bulbar muscles, neck, and shoulder and respiratory weakness are more prominent than in acetylcholine receptor (AChR) MG. MuSK au ... more
Because of the failure of many promising therapeutics identified in preclinical evaluation, funding sources have established guidelines for increased rigor in animal evaluations. The myasthenia gravis (MG) community of scientists has developed guidelines for preclinical assessme ... more
Smart skin that can respond to external stimuli could have important applications in medicine and robotics. Using only items found in a typical household, researchers have created multi-sensor artificial skin that's capable of sensing pressure, temperature, humidity, proximity, pH, and air ... more
Mercury contamination in water and on land is of worldwide concern due to its toxic effects on ecosystems and human health. Mercury toxicity is of particular concern to reptiles because they are currently experiencing population declines. Also, reptiles are ideal indicators of mercury conta ... more
A team of pioneering South Korean scientists have succeeded in producing the polymers used for everyday plastics through bioengineering, rather than through the use of fossil fuel based chemicals. This groundbreaking research, which may now allow for the production of environmentally consci ... more