Welcome to the Alvarez Research Group
We specialize in a unique blend of soft matter physics, polymer dynamics, molecular rheology, and interfacial and transport mechanics. Our labs are located on campus at Drexel University.
Abstract The nonlinear rheology of three selected commercial low-density polyethylenes (LDPE) is measured in uniaxial extensional flow. The measurements are performed using three different devices including an extensional viscosity fixture
Stress Relaxation of Bi-Disperse Polystyrene Melts: Exploring the Interactions between Long and Short Chains in Non-Linear Rheology
Abstract We present start-up of uniaxial extension followed by stress relaxation experiments of a bi-disperse 50 % by weight blend of 95k and 545k molecular weight polystyrene. We also show,
The Interplay of Aggregation, Fibrillization and Gelation of an Unexpected Low Molecular Weight Gelator: Glycylalanylglycine in Ethanol/Water
Abstract Hydrogels formed by polypeptides could be much-favored tools for drug delivery because their main ingredients are generally biodegradable. However, the gelation of peptides in aqueous solution generally requires a
This collaborative effort examines the relationship between processing conditions and material performance in high impact (high strain rate) applications. We have developed a novel gel spinning apparatus that controls key
The effect of network topology on material properties in vinyl-ester/styrene thermoset polymers using molecular dynamics simulations and time–temperature superposition
Abstract The time–temperature superposition principle (TTSP) is a promising tool for filling the time-scale gap between molecular dynamics simulation and experiments in polymer systems. Here we propose a molecular dynamics
This work revisits several open questions regarding the mechanisms of GAG fibril formation and structure as a function of temperature.
Exploring the gel phase of cationic glycylalanylglycine in ethanol/water. II. Spectroscopic, kinetic and thermodynamic studies
Abstract HypothesisRecently, we reported a three-dimensional phase diagram for the gelation of cationic tripeptide glycylalanylglycine (GAG) in water–ethanol mixtures. We showed that the gel strength reaches an optimum for a
Exploring the gel phase of cationic glycylalanylglycine in ethanol/water. I. Rheology and microscopy studies
Abstract HypothesisThe cationic tripeptide glycylalanylglycine (GAG) self-assembles into long, thick crystalline fibrils in an ethanol/water solution. At sufficiently high concentrations, the fibrils form a volume spanning hydrogel network. We report
Formulation of a model resin system for benchmarking processing-property relationships in high-performance photo 3D printing applications
Abstract A well-defined resin system is needed to serve as a benchmark for 3D printing of high-performance composites. This work describes the design and characterization of such a system that
Abstract High performance ultra high molecular weight polyethylene (UHMWPE) fibers are primarily composed of extended chain (shish) and lamellae (kebab) crystalline domains. Characterization of these architectures commonly utilizes x-ray scattering
Meet the Lab
We celebrated Thanksgiving with classic holiday dishes like stuffing waffles, barbacoa and savory vegan morsels.
Winter Break 2019
Annual lab party to celebrate the holidays with the Alvarez family.
The Lab in 2016
A group photo of the Alvarez Research Group in our early years.
The Lab in 2018
Members of the Alvarez Research Group in 2018.