scholarly journals Smart coating with dual-pH sensitive, inhibitor-loaded nanofibers for corrosion protection

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Chao Li ◽  
Xiaolei Guo ◽  
Gerald S. Frankel
Keyword(s):  
Corrosion Protection ◽  
Spectroscopic Analysis ◽  
Polyvinyl Butyral ◽  
Ph Sensitive ◽  
Electrospinning Technique ◽  
Smart Coatings ◽  
Ph Conditions ◽  
Smart Coating ◽  
Coating Matrix ◽  
Recent Attention

AbstractSmart coatings that provide corrosion protection on demand have received a lot of recent attention. In the present study, nanofibers containing a corrosion inhibitor were prepared by a coaxial electrospinning technique, which addresses the limitations of inhibitor-loaded microcapsules or nanocontainers. The as-prepared nanofibers have a core-shell structure with Ce(NO3)3 and the chitosan/polyacrylic acid polyelectrolyte coacervate as the core and shell materials, respectively. UV-vis spectroscopic analysis confirms that the nanofibers are pH-sensitive and able to release the enclosed Ce(NO3)3 at both low and high pH conditions, which are spontaneously generated during corrosion at local anodes and cathodes, respectively. A coating system consisting of such nanofibers within a polyvinyl butyral coating matrix exhibits improved corrosion protection of an AA2024-T3 substrate. Moreover, the embedded Ce(NO3)3-loaded nanofibers can persistently release Ce(NO3)3 to impede corrosion of AA2024-T3 when the artificially damaged coating sample is exposed to NaCl solution.

scholarly journals Gelatin Beads/Hemp Hurd as pH Sensitive Devices for Delivery of Eugenol as Green Pesticide

2021 ◽  
Author(s):  
Gianluca Viscusi ◽  
Giuliana Gorrasi
Keyword(s):  
Release Kinetics ◽  
Barrier Properties ◽  
Ph Sensitive ◽  
Release Behavior ◽  
Sorption Coefficient ◽  
Highly Sensitive ◽  
Mean Diameter ◽  
Ph Conditions ◽  
Kinetics Of ◽  
Hemp Hurd

AbstractIn this paper gelatin beads reinforced with natural hemp hurd have been produced as pH sensitive devices for the release of eugenol, as green pesticide. The composites beads, with a mean diameter of about 1 mm, were obtained by polymer droplet gelation in sunflower oil. Thermal properties were evaluated showing no noticeable difference after the introduction of hemp hurd. Barrier properties demonstrated an improvement of hydrophobization. The introduction of 5% w/w of hemp hurd led to a reduction of sorption coefficient of about 85% compared to unloaded gelatin beads. Besides, the diffusion coefficient decreased, introducing 5% w/w of hemp hurd, from 8.91 × 10−7 to 0.77 × 10−7 cm2/s. Swelling and dissolution phenomena of gelatin beads were studied as function of pH. The swelling of gelatin beads raised as pH increased up to 2.3 g/g, 9.1 g/g and 27.33 g/g at pH 3, 7 and 12, respectively. The dissolution rate changed from 0.034 at pH 3 to 0.077 h−1 at pH 12. Release kinetics of eugenol at different pH conditions were studied. The released eugenol after 24 h is 98%, 91%, 81 and 63% w/w (pH 3), 87%, 62%, 37 and 32 wt% (pH 7) and 81%, 68%, 60 and 52 wt% (pH 12) for unloaded gelatin beads and gelatin beads with 1%, 3 and 5% of hemp hurd, respectively. The eugenol release behavior was demonstrated to be highly sensitive to the pH release medium, which allows to tune such devices as green pesticide release systems in soils with different level of acidity/basicity.

Smart coating based on double stimuli-responsive microcapsules containing linseed oil and benzotriazole for active corrosion protection

2018 ◽  
Vol 130 ◽  
pp. 56-63 ◽  
Author(s):  
Débora Abrantes Leal ◽  
Izabel Cristina Riegel-Vidotti ◽  
Mário Guerreiro Silva Ferreira ◽  
Cláudia Eliana Bruno Marino
Keyword(s):  
Corrosion Protection ◽  
Linseed Oil ◽  
Stimuli Responsive ◽  
Smart Coating ◽  
Active Corrosion

Compatibility studies between an amphiphilic pH-sensitive polymer and hydrophobic drug using multiscale simulations

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 101323-101333 ◽  
Author(s):  
Yan Wang ◽  
Jia Wei Ren ◽  
Can Yang Zhang ◽  
Meng Chan He ◽  
Zhi Min Wu ◽  
...  
Keyword(s):  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Ph Sensitive ◽  
Multiscale Simulations ◽  
Hydrophobic Drug ◽  
Compatibility Studies ◽  
Ph Conditions ◽  
Ph Sensitive Polymer ◽  
Dynamics Simulations

Dissipative particle dynamics simulations are integrated to investigate the morphologies of drug-loaded micelles and the drug distributions inside the micelles at different pH conditions.

OPERATING RANGE RESPONSIVENESS DEFINITION OF LUMINESCENT SMART COATING BY RESULTS OF IMPACT DAMAGES PARAMETERS ULTRASONIC MEASUREMENTS

2020 ◽  
pp. 26-33
Author(s):  
S. A. Smotrova ◽  
V. I. Ivanov ◽  
A. V. Smotrov ◽  
A. N. Kuskova ◽  
Yu. V. Mantrova
Keyword(s):  
Visual Inspection ◽  
Impact Damage ◽  
Operating Range ◽  
Permissible Range ◽  
Additional Equipment ◽  
Smart Coatings ◽  
Smart Coating ◽  
The Difference ◽  
Definition Of ◽  
Impact Damages

One of the characteristic aircraft damages is impact by foreign object. In subsequent operation, the presence of impact damages to airframes made of polymer composite materials (PCM) leads to a violation of their structures and integrities. To avoid accidents it is necessary to identify and measure the parameters of such damages. The paper analyzes literature data, impact tests results and ultrasonic control of PCM samples. PCM samples represent plates. Dependences of PCM samples defect size on impact energy are revealed. It is shown that at energy of effect in a range 10…45 J damages with the linear sizes 25…70 mm are formed. The difference of the damages sizes on facing and turnaround surfaces of PCM samples is noted. The largest number of procedures in aviation is visual inspection with the naked eye or using any additional equipment. Its main disadvantage in relation to composite products is the fundamental inability to detect barely visible impact damage and internal defects that do not extend to the surface. The technology of impact damage detection using special impact -sensitive luminescent smart coatings with optical properties allows to improve the visual inspection procedure qualitatively. The result of the research is to define the permissible range of coating sensitivity. The luminescent smart coating operating range is determined: 10…20 J. Luminescent smart coating is developed for detection of barely visible impact damage on composite airframes.

Smart coating for corrosion protection by adopting nano particles

2012 ◽  
Vol 74 (3) ◽  
pp. 461-469 ◽  
Author(s):  
N. Selvakumar ◽  
K. Jeyasubramanian ◽  
R. Sharmila
Keyword(s):  
Corrosion Protection ◽  
Nano Particles ◽  
Smart Coating

scholarly journals Application of Mesoscale Simulation to Explore the pH Response of Eudragit S100 Used as the Novel Colon-Targeted Powder of Pulsatilla Saponin D

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mingcheng Gong ◽  
Zhenhua Chen ◽  
Liangliang Zhou ◽  
Feng Gao ◽  
Jianxin Cheng ◽  
...  
Keyword(s):  
Self Assembly ◽  
Morphological Changes ◽  
Drug Carrier ◽  
Dissipative Particle Dynamics ◽  
Ph Sensitive ◽  
The Self ◽  
Coarse Grained ◽  
Release Mechanism ◽  
Eudragit S100 ◽  
Ph Conditions

As a pH-sensitive nanomaterial, Eudragit S100 has good colon targeting. However, little research has been carried out on its mesoscopic scale. In this paper, the self-assembly behavior of Pulsatilla saponins D (PSD) and Eudragit S100, as well as the loading and release mechanism of PSD, was investigated via computer simulations. The effects of the self-assembly characteristics of PSD and Eudragit S100 in the dry powder state on the drug-carrier ratio were explored by the coarse-grained molecular dynamics (CGMD) method. According to the pH-responsive feature of Eudragit S100, the drug protection under gastric pH conditions and release in colonic pH conditions were simulated through the dissipative particle dynamics (DPD) method, which has provided insights into the microscopic morphological changes in the pH-sensitive drug delivery systems.

scholarly journals Studying the anticancer activity in vitro of doxorubicin-encapsulated pH-sensitive redox nanoparticles

2021 ◽  
Vol 63 (5) ◽  
pp. 22-28
Author(s):  
Thi Hoang Nguyen ◽  
◽  
Nhu Thuy Trinh ◽  
Binh Long Vong ◽  
◽  
...  
Keyword(s):  
Cancer Cells ◽  
Chemotherapeutic Agent ◽  
Low Ph ◽  
Ph Sensitive ◽  
Coated Nanoparticles ◽  
Specific Distribution ◽  
Application Potential ◽  
Ph Conditions ◽  
Mcf 7

Doxorubicin (DOX) is known as a chemotherapeutic agent for treating a variety of cancers. However, due to non-specific distribution, DOX causes severe side effects, leading to the limitation of its clinical application. In this study, pH-sensitive redox nanoparticles containing DOX were studied to form drug-coated nanoparticles with the size of about 40-60 nm that increases the concentration of drugs accumulated at the tumor site in response to low pH conditions. The optimal properties of the nanoparticles were investigated by analysing the antioxidant activity, sensitivity to pH, drug delivery in a low pH environment, and toxicity on cancer cells, thereby observing the possibility of inhibiting the migration of cancer cells. Results showed that the combination of DOX and the pH-sensitive redox nanoparticles not only increases anticancer in colorectal cancer (C-26), breast cancer (MCF-7) but also reduces bovine aorta endothelial cells (BAEC) and inhibits C-26 cell migration in vitro.Thepaper results reveal the application potential of the pH-sensitive redox nanoparticles in improving the effectiveness of cancer treatment.

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