A5056957675- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Electrospun Nanofibers in Biomedical Applications
- Nanocomposite Films for Food Packaging
- Innovations in Concrete and Construction Materials
- Additive Manufacturing and 3D Printing Technologies
- Natural Fiber Reinforced Composites
- Advanced ceramic materials synthesis
- Surface Modification and Superhydrophobicity
- Polymer composites and self-healing
- Advanced materials and composites
- biodegradable polymer synthesis and properties
- Advanced Sensor and Energy Harvesting Materials
- Advanced Battery Materials and Technologies
- Polysaccharides and Plant Cell Walls
- Material Properties and Processing
- Phase Change Materials Research
- Antimicrobial agents and applications
- Injection Molding Process and Properties
- Concrete and Cement Materials Research
- Infrastructure Maintenance and Monitoring
- Asphalt Pavement Performance Evaluation
- Advancements in Battery Materials
- Bone Tissue Engineering Materials
- Epoxy Resin Curing Processes
Purdue University West Lafayette
2016-2025
Cornell University
2003
University of Massachusetts Amherst
1999-2001
Louisiana State University
1994
The preparation of ultrahydrophobic and ultralyophobic surfaces using several techniques is described. Plasma polymerization 2,2,3,3,4,4,4-heptafluorobutyl acrylate on poly(ethylene terephthalate) yields with water contact angles θA/θR = 174°/173°. Argon plasma etching polypropylene in the presence poly(tetrafluoroethylene) renders as high 172°/169°. Surfaces compressed pellets submicrometer, variable-diameter spherical particles PTFE oligomers exhibit 177°/177°, methylene iodide 140°/138°,...
Thin films of 3-aminopropyltriethoxysilane (APTES) are commonly used to promote adhesion between silica substrates and organic or metallic materials with applications ranging from advanced composites biomolecular lab-on-a-chip. Unfortunately, there is confusion as which reaction conditions will result in consistently aminated surfaces. A wide range conflicting experimental methods researchers often assuming the creation smooth self-assembled monolayers. film morphologies based on deposition...
Ultrahydrophobic polypropylene surfaces were prepared by the simultaneous etching of and etching/sputtering poly(tetrafluoroethylene) (PTFE) using inductively coupled radio frequency argon plasma. The semicrystalline surface is roughened due to differential rates at which crystalline amorphous regimes ablate also fluorinated fluorocarbon plasma that results from ablation/depolymerization PTFE. roughness controlled time etching. presence PTFE increases rate roughening reactive ion resulting...
We examine the wettability of rough surfaces through a measurement approach that harnesses wrinkling instability to produce model substrate topographies. Specifically, we probe wetting liquids on anisotropic micro-wrinkled features exhibit well-defined aspect ratios (amplitude versus wavelength wrinkles) can be actively tuned. Our study provides new insight into behavior and interpretation related liquid contact-angle measurements. In particular, find droplet anisotropy is governed primarily...
Solar energy is potentially the largest source of renewable at our disposal, but significant advances are required to make photovoltaic technologies economically viable and, from a life-cycle perspective, environmentally friendly and consequently scalable. Cellulose nanomaterials emerging high-value nanoparticles extracted plants that abundant, sustainable. Here, we report on first demonstration efficient polymer solar cells fabricated optically transparent cellulose nanocrystal (CNC)...
The strain-dependent electrical resistance characteristics of multi-walled carbon nanotube (MWCNT)/polymer composite films were investigated. In this research, polyethylene oxide (PEO) is used as the polymer matrix. Two representative volume fractions MWCNT/PEO selected: 0.56 vol% (near percolation threshold) and 1.44 (away from MWCNT. An experimental setup which can measure strain simultaneously continuously has been developed. Unique repeatable relationships in versus obtained for multiple...
Abstract Hunger and chronic undernourishment impact over 800 million people, which translates to ≈10.7% of the world's population. While countries are increasingly making efforts reduce poverty hunger by pursuing sustainable energy agricultural practices, a third food produced around globe still is wasted never consumed. Reducing shortages vital in this effort often addressed development genetically modified produce or chemical additives inedible coatings, create additional health...
Additive manufacturing of near‐net‐shaped dense ceramic components has been established via room‐temperature direct writing highly loaded aqueous alumina suspensions in a layer‐by‐layer fashion. The effect solid loading on rheology, specimen uniformity, density, microstructure, and mechanical properties was studied. All contained polymer binder (~5 vol.%), dispersant, 51–58 vol.% powder. Rheological measurements indicated all to be yield‐pseuodoplastic, both yield stress viscosity were found...
In nature, cellulose nanofibers form hierarchical structures across multiple length scales to achieve high-performance properties and different functionalities. Cellulose nanofibers, which are separated from plants or synthesized biologically, being extensively investigated processed into materials owing their good properties. The alignment of is reported significantly influence the performance nanofiber-based materials. can bridge nanoscale macroscale, bringing enhanced macroscale However,...
Abstract 3D printing (3DP) technologies have transformed the processing of advanced ceramics for small‐scale and custom designs during past three decades. Simple complex parts are designed manufactured using 3DP structural, piezoelectric, biomedical applications. Manufacturing simple or geometries one‐of‐a‐kind components without part‐specific tooling saves significant time creates new applications ceramic materials. Although development innovations in far behind compared with metals...
The wetting character of surfactant based polymer brushes is examined. unique ability for the brush surfaces to be both hydrophilic and oleophobic rendered self-cleaning materials.
Abstract Due to their high surface energy, hydrophilic surfaces are susceptible contaminations which difficult remove and often ruin the surface. Traditional anti‐fog coatings especially limited by contaminants, as prevention of fogging is enhanced hydrophilicity increases. Thus, advanced solutions required incorporate some degree self‐cleaning ability without significant losses in character. Potential next generation characterized with particular emphasis on extended lifetime...
The coefficient of thermal expansion (CTE) cellulose nanocrystal (CNC) films was characterized using novel experimental techniques complemented by molecular simulations. characteristic birefringence exhibited CNC utilized to calculate the in-plane CTE self-organized and shear-oriented self-standing from room temperature 100 °C polarized light image correlation. alignment estimated via Hermans order parameter (S) 2D X-ray diffraction measurements. We found that with no preferential...
There is an increasing interest in hierarchical design and additive manufacturing (AM) of cement-based materials. However, the brittle behavior these materials presence interfaces from AM process currently present a major challenge. Contrary to commonly adopted approach eliminate 3D-printed hardened cement paste (hcp) elements, this work focuses on harnessing heterogeneous by employing novel architectures (based bioinspired Bouligand structures). These are found generate unique damage...
We achieved a multiscale description of the thermal conductivity cellulose nanocrystals (CNCs) from single CNCs (∼0.72–5.7 W m–1 K–1) to their organized nanostructured films (∼0.22–0.53 using experimental evidence and molecular dynamics (MD) simulation. The ratio approximate phonon mean free path (∼1.7–5.3 nm) lateral dimension CNC (∼5–20 suggested contribution crystal–crystal interfaces polydisperse film's heat transport. Based on this, we modeled MD-predicted crystal interface properties...
Cellulose nanomaterials are promising materials for the polymer industry due to their abundance and renewability. In packaging applications, these may impart enhanced gas barrier performance high crystallinity polarity. this work, low superior pristine nanocellulose films were produced using a shear-coating technique obtain range of anisotropic films. Induction anisotropy in film can control overall free volume system which effectively controls diffusion path; hence, controlled results...