A5037638046- Hydrogels: synthesis, properties, applications
- Advanced Polymer Synthesis and Characterization
- Electrospun Nanofibers in Biomedical Applications
- biodegradable polymer synthesis and properties
- Wound Healing and Treatments
- Natural Fiber Reinforced Composites
- Dendrimers and Hyperbranched Polymers
- Block Copolymer Self-Assembly
- 3D Printing in Biomedical Research
- Fiber-reinforced polymer composites
- Extraction and Separation Processes
- Graphene and Nanomaterials Applications
- Fuel Cells and Related Materials
- Chemical Synthesis and Reactions
- Polymer crystallization and properties
- Advanced battery technologies research
- Advanced oxidation water treatment
- Nanoparticles: synthesis and applications
- Diamond and Carbon-based Materials Research
- Polymer Surface Interaction Studies
- Skin Protection and Aging
- Organoboron and organosilicon chemistry
- Antimicrobial agents and applications
- Engineering and Information Technology
- Advanced Cellulose Research Studies
Instituto Tecnológico de Tijuana
2016-2025
Tecnológico Nacional de México
2013-2025
Carnegie Mellon University
2013
Instituto Tecnológico de Saltillo
2013
Virginia Commonwealth University
2013
Universidad de Guanajuato
2013
Case Western Reserve University
2013
Universidad Autónoma de Coahuila
1999
In this work, five new chelating resins (MRnBz) functionalized with N -benzyl bis(carbamoyl)carboxylic acid molecules (Bz bCCA ) on their surface were prepared to study the metal ion (M n + adsorption properties in water.
The limited mechanical properties of composite materials, including stiffness, strength, and biocompatibility, restrict their effectiveness in biomedical applications. This research enhanced the biocompatibility polylactic acid carbon fiber-reinforced composites (PLA/CFRCs) by incorporating multi-walled nanotube (MWCNT) fillers. methodology involved synthesizing MWCNTs integrating them into PLA/CFRC laminates using fusion-blending, dispersion, interlaminar spray-coating. Raman spectroscopy...
Chemically crosslinked hydrogels based on poly(N-vinylcaprolactam) (PNVCL) were synthetized by a photoinitiated chemical method. A galactose-based monomer, 2-lactobionamidoethyl methacrylate (LAMA), and N-vinylpyrrolidone (NVP) added with the aim to improve physical properties of hydrogels. The effects both comonomers swelling ratio (Q), volume phase transition temperature (VPTT), glass (Tg), Young’s moduli mechanical compression below above VPTT studied. Gold nanorods (GNRDs) 5-fluorouracil...
Abstract Sugar cane bagasse fibers were modified by surface treatments using either physical or chemical methods in order to improve their adhesion polystyrene matrices. The treatment used alkaline treatment, with silane coupling agents, coating and grafting of without crosslinker. Fiber modifications monitored Fourier Transform Infrared Spectroscopy (FTIR), Differential Thermal Analysis coupled Thermogravimetric (DTA‐TGA) Scanning Electron Microscopy (SEM). On the other hand, improvement...
AbstractPolymeric nanogels containing N-vinylcaprolactam (NVCL) and polyethyleneglycol methylether methacrylate (PEGMA) have been prepared by surfactant free emulsion polymerization. The influence of NVCL to PEGMA concentration ratio on the particle size distribution was studied. PNVCL:PEGMA nanogel particles exhibit thermal responsive properties in water their transition temperature increases with higher content PEGMA. It found that diameter decreased when amounts were used monomer mixture....
Currently, wound dressing technology is of significant interest in order to avoid undesired effects when burns or skin wounds are treated, especially their risk for microbial contamination and subsequent infection. Silver nanoparticles (AgNPs) have claimed importance as antimicrobial agents. For these reasons, a comparative study different methods synthesize electrospun polymeric fibers loaded with AgNPs (Ag+/PCLPVP) such direct blending, ultraviolet irradiation, thermal treatment, silver...
Nanocomposite hydrogels were prepared based on crosslinked poly(2‐hydroxyethyl methacrylate) (PHEMA) as polymer matrix and nanocrystalline cellulose fibers (NCC) nanomaterial filler. NCC obtained by acid hydrolysis of cotton pristine PHEMA nanocomposite synthesized photopolymerization. Physicochemical, thermal, mechanical properties evaluated differential scanning calorimetry, thermogravimetric analysis, tests submersion compression, measurements swelling at equilibrium. Results showed that...
The kinetics of oxidation 1,4-dioxane by persulfate ion with Ag+ in aqueous solutions at various temperatures and concentrations S2O82-, H2SO4, were investigated. Experimental results indicate that degradation follows a pseudo-firstorder decay model reaction rate significantly accelerate increasing temperature concentration oxidant, sulfuric acid ions up to 0.46 mM; for the range from 0.46-0.70 mM remains constant higher decreases. It was possible degrade approximately 100% less than one...
The preparation of poly(hexylacrylate) core ‐poly(ethyleneglycol methacrylate) shell (PHA‐ co‐ PEGMA) nanogels, to be used as fillers in nanocomposite hydrogels, is reported. Stable nanogels with particle sizes between 90–300 nm were obtained varying the conditions synthesis. synthesis recipe could easily scaled up. Purified and dispersed aqueous solution soft for poly(2‐hydroxyethyl (PHEMA) crosslinked ethylene glycol dimethacrylate (EGDMA). hydrogels exhibit a larger swelling capacity...
A hybrid nylon 6,6 short glass/carbon fiber composite has been studied. The effect of reprocessing on the microstructure and mechanical properties was evaluated for injection-molded products. Fiber size distribution, molecular weight matrix, thermal transitions, Young modulus impact strength are among during nine cycles by injection molding. For first five an increase in tensile strength, observed whereas average fibers-size decreased. Reprocessing after 5 led to a decrease properties. SEM...
Waste can be considered a crisis across the world, especially in Global South where landfills are collapsing and vector-borne illnesses increasing. Due to increase amount of waste plastic environment, different uses recycled plastics being investigated. One such use is roofing tiles. This has been put place Sri Lanka through for Life organization. Here, polyethylene filled with rice husk particles. hydrophilic nature husk, strength composites decreased increasing filler. Since tiles do not...
Poly(styrene)‐ b ‐poly( N,N ′‐diethylaminoethyl methacrylate) (PS‐ ‐PDEAEM) block copolymer was synthesized by RAFT free‐radical polymerization using a trithiocarbonate type of chain transfer agent (CTA). Several compositions were achieved maintaining low polydispersities PS as macro‐CTA in the first step. Thin films 60% ‐ ‐PDEAEM 40% deposited over mica substrate, and its equilibrium nonequilibrium nanostructures studied. Lamellar (equilibrium), bicontinuous (nonequilibrium) detached...
Dual pH- and temperature-sensitive hydrogels have been prepared based on N-isopropylacrylamide (NIPAAm) either potassium 5-methacryloyloxy-pentanoate (M4K) or potassium11-methacryloyloxy-undecanoate (M10K) as comonomers. The gels containing M10K (longer methylene chain) showed a slightly lower swelling capacity than the M4K. Hydrogels were produced with specific phase transition temperature (Tcr) in range from 12 to 76 oC for NIPAAm-C4 (containing M4K) 16 36 NIPAAm-C10 M10K) by controlling:...
Abstract In this work we report the photopolymerization of poly(2‐hydroxyethyl methacrylate) (PHEMA) together with a hydrophilic chitosan derivate (carboxymethyl‐chitosan) to yield semi‐interpenetrating polymer network (semi‐IPN) that was filled poly( N ‐vinylcaprolactam)/poly(ethylene glycol core–shell nanogels in order enhance mechanical properties resulting hydrogels. The nanofilled semi‐IPNs were found be more suitable for wound dressing applications than PHEMA hydrogel as described by...
Abstract This study involves the synthesis, characterization and of self‐aggregation PEG‐based amphiphilic triblock copolymers. PEG based difunctional macro RAFT agents were synthesized characterized. PS‐ b ‐PEG‐ ‐PS block copolymers via controlled free radical polymerization using dual agents. The content polystyrene blocks on triblocks was varied from 12% to 36% (based molecular weight increase), adjusting synthetic conditions. self‐aggregate in Dioxane‐Water mixtures sizes depending water content.
Abstract A series of crosslinked hydrogel are developed to evaluate their applicability as efficient carriers for sustained release ciprofloxacin (CFX) with bactericidal activity. The hydrogels prepared from 2‐hydroxyethyl methacrylate (HEMA) and carboxymethyl‐chitosan (CMCS) using ethylene glycol dimethacrylate (EGDMA) crosslinker yield a semi‐interpenetrating polymer networks (semi‐IPNs) by photoinitiated chemical method. Molecular weight concentration CMCS in the network varied optimize...
This study investigates the fabrication and characterization of electrospun poly (ε-caprolactone)/poly (vinyl pyrrolidone) (PCL/PVP) fibers integrated with a nanocomposite chitosan, silver nanocrystals, graphene oxide (ChAgG), aimed at developing advanced wound dressing materials. The ChAgG nanocomposite, recognized for its antimicrobial biocompatible properties, was incorporated into PCL/PVP through electrospinning techniques. We assessed resultant fibers' morphological, physicochemical,...