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E. E. Pérez‑Ramírez,M. de la Luz‑Asunción,A. L. Martínez‑Hernández,G. de la Rosa‑Álvarez,S. Fernández‑Tavizón,P. Salas,C. Velasco‑Santos 한국탄소학회 2019 Carbon Letters Vol.29 No.2
One- and two-dimensional carbon nanomaterials were tested as adsorbents for the elimination of two anionic dyes, reactive red 2 and methyl orange, and the cationic dye methylene blue from aqueous solutions under the same conditions. Carbon nanomaterials performed well in the removal of dyes. Surface oxygenated groups in the nanomaterials improved the cationic dyes’ adsorption, but not the adsorption of the anionic dye. The interactions between nanomaterials and dyes were verified by infrared and Raman spectroscopy. The pseudo-second order kinetic model was better fitted to the kinetic experimental data than the Elovich and pseudo-first order models. The equilibrium adsorption data were best fitted by the Langmuir model. The dimensions and morphology of the carbon nanomaterials play an important role in the adsorption of the three dyes. The main mechanism of adsorption of anionic dyes is by the interactions of the aromatic rings of the dye structures and π delocalized electrons on carbon nanostructures; the adsorption of cationic dye is mainly due to electrostatic interactions.
Curcumin-loaded Polycaprolactone/Collagen Composite Fibers as Potential Antibacterial Wound Dressing
E. San Martín-Martínez,Casañas-Pimentel,A. Almaguer-Flores,G. Prado-Prone,A. García-García,C. Landa-Solís,A. Hernández-Rangel 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
The development of wound dressings with therapeutical benefits is of great importance in skin tissue engineeringapplications, adding bioactive molecules into biomaterials is a strategy to achieve a better biological response. In this study,four different concentrations of curcumin (CUR; 5, 10, 15 and 20 by weight in relation to the PCL content) were incorporatedinto solutions composed of polycaprolactone (PCL) and collagen (COL) for the manufacture of electrospun fibers. The PCLCOL-CUR fibers were physicochemically characterized in terms of their morphology, wettability, degradation rate,mechanical behavior, and cumulative curcumin release. The in vitro biological properties of the composite membranes werealso evaluated. The results indicated that the membranes have diameters on average of approximately 200 nm. The wateruptake was adequate for exudates remotion in a wound, and the degradation rate of the fibers was highly appropriate toachieve complete skin tissue regeneration. The addition of CUR to composite membranes produced a significant increase inthe mechanical properties which indicate a satisfactory clinical handling. The incorporation of CUR produced a significantdecrease in the planktonic growth of S. aureus over time, however, the antibacterial effect against E. coli was limited, thepresence of CUR did not cause the inhibition of its growth. Finally, the viability of human dermal fibroblasts seeded on thetop of the membranes indicated the cytotoxic dosage effect of CUR, the two highest CUR concentrations produced asignificant loss of cell viability. Overall, our results suggested that the CUR-loaded PCL-COL composite membranes arepromising candidates for use as antibacterial dressings to enhance clinical wound management.
C. G. Garay-Reyes,S. E. Hernández-Martínez,J. L. Hernández-Rivera,J. J. Cruz-Rivera,E. J. Gutiérrez-Castañeda,H. J. Dorantes-Rosales,J. Aguilar-Santillan,R. Martínez-Sánchez 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
According to Lifshitz, Slyozov, and Wagner (LSW) and Trans-Interface Diffusion-Controlled (TICD) theoreticalmodels, this paper reports the microstructure and its coarsening behavior of γ' metastable-coherentprecipitates in concentration gradient of Ni-13.75Ti (at%)/Ni generated by diffusion couple. The coarseningof precipitates was evaluated in two different Ti contents (R1-11.4Ti (at%) and R2-13Ti (at%)) generated alongthe concentration gradient and includes average size, size distributions and growth rate. The solvus andmetastable-coherent bimodal lines as determined at 850 °C of 9.16 (at%) and 9.92Ti (at%) respectively byscanning electron microscopy. This paper suggests that elastic strains produced by the matrix/precipitate latticemismatch caused significant deviations between the experimental results and those predicted by the LSW or TIDCtheories. Activation energies for TIDC (Qi) and LSW (Qr) are Qr: 219.69 and 172.61 kJ mol-1for R1 and R2regions, respectively, and Qi: 218.46 and 164.56 kJmol-1for R1 and R2 regions, respectively. A concentration gradientallows the study of various alloys with different concentration and volume-fraction in a single sample.