The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Juan P. Hinestroza - One of the best experts on this subject based on the ideXlab platform.
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decoration of Cotton Fibers with a water stable metal organic framework uio 66 for the decomposition and enhanced adsorption of micropollutants in water
Bioengineering, 2018Co-Authors: Marion Schelling, Eugenio H Otal, Juan P. HinestrozaAbstract:We report on the successful functionalization of Cotton fabrics with a water-stable metal–organic framework (MOF), UiO-66, under mild solvothermal conditions (80 °C) and its ability to adsorb and degrade water micropollutants. The functionalized Cotton samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). UiO-66 crystals grew in a uniform and conformal manner over the surface of the Cotton Fibers. The Cotton fabrics functionalized with UiO-66 frameworks exhibited an enhanced uptake capacity for methylchlorophenoxypropionic acid (MCPP), a commonly used herbicide. The functionalized fabrics also showed photocatalytic activity, demonstrated by the degradation of acetaminophen, a common pharmaceutical compound, under simulated sunlight irradiation. These results indicate that UiO-66 can be supported on textile substrates for filtration and photocatalytic purposes and that these substrates can find applications in wastewater decontamination and micropollutant degradation.
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correction one step growth of isoreticular luminescent metal organic frameworks on Cotton Fibers
RSC Advances, 2015Co-Authors: Ruya R Ozer, Juan P. HinestrozaAbstract:Correction for ‘One-step growth of isoreticular luminescent metal–organic frameworks on Cotton Fibers’ by R. R. Ozer et al., RSC Adv., 2015, 5, 15198–15204.
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one step growth of isoreticular luminescent metal organic frameworks on Cotton Fibers
RSC Advances, 2015Co-Authors: Ruya R Ozer, Juan P. HinestrozaAbstract:A series of isoreticular lanthanide metal–organic frameworks, Ln-MOFs (Ln = Eu, Gd, and Tb), were directly grown on Cotton Fibers using a room temperature water-based direct precipitation method. This facile synthesis protocol involves equimolar concentrations of aqueous Ln3+ salts and 1,3,5-benzenetricarboxylic acid that enables effective crystallization of a high amount of Ln-MOFs on Cotton Fibers. 1D thin, continuous, and dense wire-like structures were obtained. Ln-MOF structures were found well attached to the Cotton Fibers while maintaining their crystal structures. Under UVC exposure, intense emissions of red, blue, and green were observed for Eu-, Gd-, and Tb-MOFs. Potential applications of this technology include protective clothing, textile-based sensors, and smart tagging.
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Effect of surface cationization on the conformal deposition of polyelectrolytes over Cotton Fibers
Cellulose, 2007Co-Authors: Kevin Hyde, Hong Dong, Juan P. HinestrozaAbstract:The effect of surface cationization on the conformal deposition of alternating nanolayers of poly(sodium styrene sulfonate) (PSS) [Kleinfeld E, Ferguson G (1996) Chem Mater 8:1575–1578] and poly(allylamine hydrochloride) (PAH) over Cotton Fibers is reported. Three different levels of Cotton cationization were evaluated. Variations in the cationization degree were achieved by manipulating the ratio of 3-chloro-2-hydroxy propyl trimethyl ammonium to NaOH. Experimental results obtained via Carbon–Hydrogen–Nitrogen–Sulfur (CHNS) elemental analysis and X-ray Photoelectron Spectroscopy (XPS) indicated that the deposition process was not significantly influenced by the degree of Cotton cationization. The build up of further polyelectrolyte layers was found to be less sensitive to variations in the cationic character of the substrates once a critical number of alternating layers was deposited.
Mohamed M Chehimi - One of the best experts on this subject based on the ideXlab platform.
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the efficacy of surfactants in stabilizing coating of nano structured cuo particles onto the surface of Cotton Fibers and their antimicrobial activity
Materials Chemistry and Physics, 2018Co-Authors: Issa M Elnahhal, Mohamed Selmane, Abdelraouf A Elmanama, Nadia Amara, Fawzi S Qodih, Mohamed M ChehimiAbstract:Abstract The efficacy of surfactants in stabilizing CuO-NPs onto the surface of the Cotton Fibers and their ability to produce homogeneous CuO-coated Cotton composite was studied using different types of surfactants. The use of surfactants provides better adhesion of the CuO NPs and consequence, enhanced its coating stability during exploitation. The optical structure and morphology of the coated Cotton fabrics were examined by several methods include: X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform spectroscopy (FTIR). The CuO-NPs-coated Cotton fabrics have resisted the intensive 10 washing cycles in particular, in presence of SDS (25% loss of CuO) in comparison with TX-100 (66.5% loss of CuO). The CuO-NPs coated Cotton materials have also showed an excellent inhibition for the growth of the medically relevant staphylococcus aureus and escherichia coli respectively by 91% and 95% using SDS and HY.
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stabilization of nano structured zno particles onto the surface of Cotton Fibers using different surfactants and their antimicrobial activity
Ultrasonics Sonochemistry, 2017Co-Authors: Issa M Elnahhal, Mohamed Selmane, Abdelraouf A Elmanama, Nizam El M Ashgar, Nadia Amara, Mohamed M ChehimiAbstract:ZnO NPs were prepared and deposited onto Cotton Fibers via ultrasound irradiation successfully. Different surfactants (SDS, HY, CTAB, TX-100) have been used to stabilize, homogenize the coated ZnO NPs and control their shape and size as encapsulated species. The use of surfactants has improved the durability of ZnO NPs and decreased its leaching in particular SDS. The small mean crystallite size for ZnO particles due to the use of surfactants is the main reason for decreasing the leached of ZnO particles from Cotton substrate. SEM and XRD analysis revealed information about the shape and size of the coated ZnO nanoparticles. The use of SDS and HY surfactants in the synthesis of ZnO NPs coated fabrics showed the highest antibacterial and antifungal activities against different pathogenic bacterial and fungal species with high reduction reached over 90%.
Issa M Elnahhal - One of the best experts on this subject based on the ideXlab platform.
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the efficacy of surfactants in stabilizing coating of nano structured cuo particles onto the surface of Cotton Fibers and their antimicrobial activity
Materials Chemistry and Physics, 2018Co-Authors: Issa M Elnahhal, Mohamed Selmane, Abdelraouf A Elmanama, Nadia Amara, Fawzi S Qodih, Mohamed M ChehimiAbstract:Abstract The efficacy of surfactants in stabilizing CuO-NPs onto the surface of the Cotton Fibers and their ability to produce homogeneous CuO-coated Cotton composite was studied using different types of surfactants. The use of surfactants provides better adhesion of the CuO NPs and consequence, enhanced its coating stability during exploitation. The optical structure and morphology of the coated Cotton fabrics were examined by several methods include: X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform spectroscopy (FTIR). The CuO-NPs-coated Cotton fabrics have resisted the intensive 10 washing cycles in particular, in presence of SDS (25% loss of CuO) in comparison with TX-100 (66.5% loss of CuO). The CuO-NPs coated Cotton materials have also showed an excellent inhibition for the growth of the medically relevant staphylococcus aureus and escherichia coli respectively by 91% and 95% using SDS and HY.
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stabilization of nano structured zno particles onto the surface of Cotton Fibers using different surfactants and their antimicrobial activity
Ultrasonics Sonochemistry, 2017Co-Authors: Issa M Elnahhal, Mohamed Selmane, Abdelraouf A Elmanama, Nizam El M Ashgar, Nadia Amara, Mohamed M ChehimiAbstract:ZnO NPs were prepared and deposited onto Cotton Fibers via ultrasound irradiation successfully. Different surfactants (SDS, HY, CTAB, TX-100) have been used to stabilize, homogenize the coated ZnO NPs and control their shape and size as encapsulated species. The use of surfactants has improved the durability of ZnO NPs and decreased its leaching in particular SDS. The small mean crystallite size for ZnO particles due to the use of surfactants is the main reason for decreasing the leached of ZnO particles from Cotton substrate. SEM and XRD analysis revealed information about the shape and size of the coated ZnO nanoparticles. The use of SDS and HY surfactants in the synthesis of ZnO NPs coated fabrics showed the highest antibacterial and antifungal activities against different pathogenic bacterial and fungal species with high reduction reached over 90%.
Candace H Haigler - One of the best experts on this subject based on the ideXlab platform.
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Comprehensive analysis of cellulose content, crystallinity, and lateral packing in Gossypium hirsutum and Gossypium barbadense Cotton Fibers using sum frequency generation, infrared and Raman spectroscopy, and X-ray diffraction
Cellulose, 2015Co-Authors: Christopher M. Lee, Candace H Haigler, Kabindra Kafle, David W. Belias, Yong Bum Park, Richard E. Glick, Seong H. KimAbstract:The mesoscale packing and crystal structure of cellulose microfibrils as well as temporal changes in cell wall composition and hydration during the development of Cotton Fibers from two species, Gossypium hirsutum and G. barbadense were studied using vibrational sum frequency generation (SFG), attenuated total refection infrared (ATR-IR), Fourier transform Raman (FT-Raman) spectroscopy and X-ray diffraction (XRD). The developmental stages analyzed (13–60 days post anthesis) included primary wall synthesis, transitional cell wall remodeling, secondary wall thickening via synthesis of nearly pure cellulose, and fiber maturation. ATR-IR and FT-Raman combined with principle component analysis revealed that Fibers of both species undergo abrupt changes in the cellulose and matrix polymer contents during the transition to secondary cell wall synthesis. XRD revealed that cellulose crystal size and crystallinity increase similarly over time in both species. SFG analysis of Fibers from un-opened bolls, which were stored in water then air dried, showed subtle differences between two species in the mesoscale ordering of cellulose microfibrils in the maturing secondary walls. In the samples of mature Fibers dried on the plant after the boll split opened naturally, the difference in SFG spectra between species was negligible. Collectively, the results show that (a) SFG can uniquely reveal differences in cellulose fibril ordering in maturing Cotton Fibers before boll opening; and (b) illustrate the comparative usefulness of other commonly used spectroscopic analytical methods for Cotton fiber analysis.
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changes in the cell wall and cellulose content of developing Cotton Fibers investigated by ftir spectroscopy
Carbohydrate Polymers, 2014Co-Authors: Noureddine Abidi, Luis Cabrales, Candace H HaiglerAbstract:Abstract Fourier transform infrared (FTIR) spectra of Cotton Fibers harvested at different stages of development were acquired using Universal Attenuated Total Reflectance FTIR (UATR-FTIR). The main goal of the study was to monitor cell wall changes occurring during different phases of Cotton fiber development. Two cultivars of Gossypium hirsutum L. were planted in a greenhouse (Texas Marker-1 and TX55). On the day of flowering, individual flowers were tagged and bolls were harvested. From Fibers harvested on numerous days between 10 and 56 dpa, the FTIR spectra were acquired using UATR (ZnSe-Diamond crystal) with no special sample preparation. The changes in the FTIR spectra were used to document the timing of the transition between primary and secondary cell wall synthesis. Changes in cellulose during Cotton fiber growth and development were identified through changes in numerous vibrations within the spectra. The intensity of the vibration bands at 667 and 897 cm −1 correlated with percentage of cellulose analyzed chemically.
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a specialized outer layer of the primary cell wall joins elongating Cotton Fibers into tissue like bundles
Plant Physiology, 2009Co-Authors: Bir Singh, Utku Avci, Sarah Eichler E Inwood, Mark J Grimson, Jeff Landgraf, Debra Mohnen, Iben Sorensen, Curtis G Wilkerson, William G T Willats, Candace H HaiglerAbstract:Cotton (Gossypium hirsutum) provides the world's dominant renewable textile fiber, and Cotton fiber is valued as a research model because of its extensive elongation and secondary wall thickening. Previously, it was assumed that Fibers elongated as individual cells. In contrast, observation by cryo-field emission-scanning electron microscopy of Cotton Fibers developing in situ within the boll demonstrated that Fibers elongate within tissue-like bundles. These bundles were entrained by twisting fiber tips and consolidated by adhesion of a Cotton fiber middle lamella (CFML). The fiber bundles consolidated via the CFML ultimately formed a packet of fiber around each seed, which helps explain how thousands of Cotton Fibers achieve their great length within a confined space. The cell wall nature of the CFML was characterized using transmission electron microscopy, including polymer epitope labeling. Toward the end of elongation, up-regulation occurred in gene expression and enzyme activities related to cell wall hydrolysis, and targeted breakdown of the CFML restored fiber individuality. At the same time, losses occurred in certain cell wall polymer epitopes (as revealed by comprehensive microarray polymer profiling) and sugars within noncellulosic matrix components (as revealed by gas chromatography-mass spectrometry analysis of derivatized neutral and acidic glycosyl residues). Broadly, these data show that adhesion modulated by an outer layer of the primary wall can coordinate the extensive growth of a large group of cells and illustrate dynamic changes in primary wall structure and composition occurring during the differentiation of one cell type that spends only part of its life as a tissue.
Ruya R Ozer - One of the best experts on this subject based on the ideXlab platform.
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correction one step growth of isoreticular luminescent metal organic frameworks on Cotton Fibers
RSC Advances, 2015Co-Authors: Ruya R Ozer, Juan P. HinestrozaAbstract:Correction for ‘One-step growth of isoreticular luminescent metal–organic frameworks on Cotton Fibers’ by R. R. Ozer et al., RSC Adv., 2015, 5, 15198–15204.
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one step growth of isoreticular luminescent metal organic frameworks on Cotton Fibers
RSC Advances, 2015Co-Authors: Ruya R Ozer, Juan P. HinestrozaAbstract:A series of isoreticular lanthanide metal–organic frameworks, Ln-MOFs (Ln = Eu, Gd, and Tb), were directly grown on Cotton Fibers using a room temperature water-based direct precipitation method. This facile synthesis protocol involves equimolar concentrations of aqueous Ln3+ salts and 1,3,5-benzenetricarboxylic acid that enables effective crystallization of a high amount of Ln-MOFs on Cotton Fibers. 1D thin, continuous, and dense wire-like structures were obtained. Ln-MOF structures were found well attached to the Cotton Fibers while maintaining their crystal structures. Under UVC exposure, intense emissions of red, blue, and green were observed for Eu-, Gd-, and Tb-MOFs. Potential applications of this technology include protective clothing, textile-based sensors, and smart tagging.
