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15. Durability and restoring of superhydrophobic properties in silica-based coatings

Author

Pedraza D. Fernando, Satish C. Gupta, Satish A. Mahadik, Nagaraja D. Hegade, and P. B. Wagh

Subjects
Hot Temperature, Materials science, Surface Properties, engineering.material, Dip-coating, Phase Transition, Biomaterials, Contact angle, Colloid and Surface Chemistry, Coating, Superhydrophilicity, Materials Testing, Spectroscopy, Fourier Transform Infrared, Composite material, Temperature, Hydrogen-Ion Concentration, Silicon Dioxide, Durability, Superhydrophobic coating, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Microscopy, Electron, Scanning, Wettability, engineering, Surface modification, Glass, Wetting, Acids, Hydrophobic and Hydrophilic Interactions, Biotechnology
Abstract

The durability and restorable properties of superhydrophobicity are a most important issue essential for utilization of superhydrophobic materials in industrial and domestic fields. In this work, we have focused on the sol–gel dip coating synthesis, durability, and restoring properties of a superhydrophobic surface composed of spherical silica particles with low energy free surface successfully achieved on the surface of glass substrates. The water contact angle (WCA) of the as-prepared superhydrophobic coatings reached as high as 170 ± 1° (WCA = 170 ± 1°) and the sliding angle was 3 ± 1° (WSA = 3 ± 1°). The behavior of wettability on superhydrophobic coating surface under various external disturbances including outdoor environments, heat, and mild acidic condition is investigated. It is shown in particular that degradation and repairing of surface methyl groups between two such surfaces leads to a fully restorable coating surface by the surface modification with trimethylchlorosilane (TMCS) at room temperature. The coating also holds good thermal stability; it holds superhydrophobicity up to 550 °C and gets degrade into superhydrophilicity above 600 °C without deforming surface morphology. The results confirm the durability of the silica coating under different external disturbances and sol–gel dip coating method and restoring property provide the best solution to fabricate superhydrophobic silica coating surface with extended durability at low cost.

Published
2013

22. P06.11: Case report: fetal cardiac aneurysm

Author

Muñoz, H., primary, Munoz, G., additional, Copado, Y., additional, Aguilera, S., additional, Enriquez, G., additional, Rencoret, G.I., additional, Diaz, C., additional, Pedraza, D., additional, Vera, D., additional, and Parra‐Cordero, M., additional

Published
2016
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23. P06.10: Fetal cardiac tumours, diagnosis and prognosis

Author

Muñoz, H., primary, Munoz, G., additional, Copado, Y., additional, Aguilera, S., additional, Enriquez, G., additional, Rencoret, G.I., additional, Ortega, X., additional, Pedraza, D., additional, Vera, D., additional, and Parra‐Cordero, M., additional

Published
2016
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26. EP01.38: Perinatal outcomes of pregestational hypertension according to blood pressure range at 11–14‐week scan: impact of the 2017 ACC/AHA guidelines.

Author

Sepúlveda‐Martínez, A., Conrads, T., Guiñez, R., Guiñez, J., Muñoz, H., Valdes, E., Silva, M., Pedraza, D., Llancaqueo, M., and Parra‐Cordero, M.

Abstract

To evaluate the impact on perinatal outcomes related with placental insufficiency, by the application of the new 2017 ACC/AHA guidelines to a group of chronic hypertensive pregnancies during their first trimester assessment. The best multivariate predictive model for p-PE included a previous PE background (OR = 15) and mean arterial pressure in mmHg (OR = 1.1). EP01.38: Perinatal outcomes of pregestational hypertension according to blood pressure range at 11-14-week scan: impact of the 2017 ACC/AHA guidelines. [Extracted from the article]

Published
2022
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27. Principios de evaluación y resultados funcionales en los reimplantes de miembro superior

Author

Camporro Fernández, D., Barrio, L., García del Pozo, E., Contreras Pedraza, D., and Matarranz Faya, A.

Subjects
Amputación miembro superior, Upper limb replantation, Upper limb amputation, Reimplante miembro superior
Abstract

El objetivo de este trabajo es evaluar nuestros resultados funcionales y subjetivos en pacientes sometidos a reimplante de miembro superior. Medimos rango de movilidad articular, fuerza de la prensión y otros tests en 41 pacientes con edad media 44,8 años que sufrieron amputación de miembro superior y fueron sometidos a reimplante quirúrgico en nuestro hospital entre enero del 2005 y diciembre del 2009. Los resultados funcionales se midieron con la tabla de Mayo modificada para lesiones de pulgar, dedos largos y mano, distal a muñeca. Las amputaciones proximales a muñeca se evaluaron según los criterios de Chen. Los resultados subjetivos fueron documentados aplicando a todos los casos el cuestionario de Russell. La mayoría de las lesiones fueron provocadas por mecanismos de avulsión y 30 (74 %) fueron accidentes laborales. La tasa final de supervivencia fue del 85 % (35 pacientes) incluyendo 2 pacientes en los que se realizó trasplante de pie a mano para salvar la amputación. Aplicando la tabla de Mayo modificada, los resultados fueron buenos en pulgar y discretos en mano y dedos largos. En reimplantes proximales obtuvimos 1 resultado excelente y 2 discretos. Diecinueve pacientes retornaron al mundo laboral en una media de 10 meses. Veintisiete manifiestan satisfacción alta con los resultados obtenidos. Los resultados de cualquier reimplante deben superar los del cierre simple de una amputación. Aunque los resultados objetivos de la serie son moderados, muchos pacientes retornan al trabajo y la mayoría es capaz de realizar sus actividades cotidianas. The aim of this study was to evaluate functional and subjective outcome after upper limb replantation, with assessment or range of motions, grip strength, and additional functional tests. Forty-one patients, mean age 44.8 years old, with upper limb amputations were treated in our hospital with replantation between January 2005 and December 2009. Functional results were assessed by modified Mayo scoring system for thumb, fingers and hand amputations. Proximal amputations were evaluated according to the criteria of Chen. Subjective results were documented in all patients by Russell´s Questionnaire. Most of the injuries were caused by avulsion forces and 30 (74 %) were work related. The final survival rate was 85 % (35 patients); we include 2 patients who have had immediate foot transplantations. Using modified Mayo score system the outcome was good in thumb patients and fair in fingers and hand amputations. According to Chen´s criteria the result was excellent in 1 forearm amputation and fair in 2 patients. Nineteen patients had returned to work, their time-off work averaged was 10 months. Patient satisfaction was rated as better than expected and satisfactory in 27 patients. Outcomes of replantation must be better than revision amputation. Although functional outcomes were moderate, most of patients were able to use their hands to perform some work and daily living activities.

Published
2012

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