Papers:
Stimuli-Responsive Polymers in bioMEMS Devices
Due to their unique “switchable” properties, stimuli-responsive polymers have been attracting considerable attention in biotechnologies and successful applications have already been demonstrated in sensing, intelligent textiles, bio-separation and drug delivery systems. Development of responsive surfaces [...]
The bijel: a bicontinuous interfacially jammed emulsion gel
White K.A., Herzig E.M., Schofield A.B., Poon W.C.K., Cates M.E., Clegg P.S., University of Edinburgh, UK
The bijel is a new class of functional material comprised of two simple fluids arrested in a bicontinuous configuration. We stabilize the fluid structure using an interfacial layer of silica particles. As with colloid-stabilized emulsions, [...]
Synthesis and Self-Assembly of Biodegradable Poly(ethylene oxide)-b-Polycaprolactone (PEO-b-PCL) Diblock Copolymers
Li G., Ghoroghchian P., Qi W., Christian N., Frail P.R., Hammer D.A., Therien M.J., Carestream Health Inc., US
A series of amphiphilic poly(ethylene oxide)-b-polycaprolactone (PEO-b-PCL) diblock copolymers with various PEO blocks (number-average molecular weight (Mn): 750~5800), PEO weight fraction (fPEO) from 7.7% to 33.3%, and Mn of the copolymers from 3.6k to 57k, [...]
Atom Transfer Radical Polymerization (ATRP) as a Tool for the Synthesis of Well-Defined Functional Polymeric Materials
Tsarevsky N.V., McCarthy P., Jakubowski W., Spanswick J., Matyjaszewski K., ATRP Solutions, Inc., US
ATRP is one of the most powerful synthetic techniques that allows the synthesis of polymeric materials with predetermined molecular weight, composition, and molecular architecture derived from substituted styrenes, (meth)acrylates, or acrylonitrile. The polymers prepared by [...]
Potential for Scaled-up Manufacture of Chitosan Nanoparticles Using the Spinning Disc Processor
Spinning disc processing (SDP) is an innovative and robust continuous flow technology that has great potential for the scaled up production of nanoparticles. This study examined the feasibility of producing chitosan nanoparticles by SDP technology. [...]
Biopolymerization-Driven Self-Assembly of Nanofiber Air-Bridges
Pabba S., Fasciotto B.H., Yazdanapanah M.M., Dobrokhotov V.V., Cohn R.W., University of Louisville, US
Many proteins polymerize in vivo to form nanometer diameter fibers, including actin and fibrin. In this study we consider the application of filament-forming proteins to nanostructure fabrication. Specifically, protein fibers are induced to polymerize and [...]
The Nanomechanical Testing and Characterisation of Anti-viral Nano-structured Surface Coatings
Surface coatings of nanoparticles that possess antiviral properties have been tested by a nano scratch method for their adhesive strength to metallic and polymeric substrates. The deformed coatings were observed in an SEM and values [...]
Influence of structural forces and contact hysteresis on flow-induced aggregation and breakage of polymer nanoparticles
Static light scattering was used on-line to monitor the flow-induced aggregation of surfactant-free polystyrene latexes in a stirred tank. Various latexes with primary particles diameters ranging between 100 and 300 nm, different charge groups, different [...]
Redispersible hybrid nanopowders: cerium oxide nanoparticle complexes with phosphonated-peg oligomers
Qi L., Sehgal A., Castaing J.-C., Fresnais J., Berret J.-F., Chapel J.-P., Rhodia/CNRS joint Institution, US
Rare earth cerium oxide (ceria) nanoparticles are stabilized using end-functional phosphonated-PEG oligomers. The complexation process and structure of the resulting hybrid core-shell singlet nanocolloids are described, characterized and modeled using light and neutron scattering data. [...]
Controlled Co-Assembly of Iron Oxide Nanoparticles and Polymers: Towards the Generation of Highly Persistent Superparamagnetic Nanorods
Fresnais J., Berret J.-F., Frka-Petesic B., Sandre O., Perzynski R., Laboratoire Matière et Systèmes Complexes, FR
In this presentation, we give an account of the formation of colloidal and supracolloidal aggregates obtained by controlled co-assembly of 7 nm particles with copolymers.
Scalability and Control of Electrophoretic Directed Assembly of Nanoparticles
The nanoscale directed assembly of nanoparticles has a many applications in biotechnology, energy, electronics and nanomaterials. Directed assembly of nanoparticles for biosensor devices, nanowire and interconnects are being conducted at the CHN. The nanoparticle based [...]
Characterizing Membrane Sorption and Diffusion with Flux Lateral Force Microscopy
Bulk permeability measurements provide an incomplete descriptor of permeability when considering heterogeneous or anisotropic membranes. Localized measurements of flux allow for independent assessment of constituent contributions to total permeability. Analogous to a puck on an [...]
Atomic Force/Scanning Probe Microscopy of Pharmaceutical and Biological Materials
AFM is a valuable tool for a wide range of materials and device analysis. AFM images of particles and biopolymers are valued because direct visualization and measurement of individual objects complements the average measures obtained [...]
Characterization of Cellulose Nanocrystals by SPM
Cellulose is the world’s most abundant biopolymer and is present in virtually all plants. Its main function is to act as a reinforcement material. Cellulose is a linear chain of ringed glucose monomers ((C6H10O5)n; n=10 [...]
Multifunctional magnetic hydrogels with polyethylene glycol-derivative colloidal nanospheres for drug delivery and hyperthermia applications
Ghosh S., GhoshMitra S., Cai T., GhoshMitra S., Neogi A., Hu Z., Mills N., Southeast Missouri State University, US
Magnetically responsive thermo-active hydrogels offer several potential advantages over other bio-material systems for the controlled release of drugs and targeted thermal therapy of the cancerous cells. Thermal and magnetic responses of hydrogels can be tuned [...]
The effect of polymerization rate on the formation of polyaniline nanofibers
This study reports the synthesis of polyaniline (PANI) nanofibers with an average diameter of 30~50 nm using HCl as a dopant. Experiments controlled the polymerization rate in terms of temperature and oxidant concentration. Transmission electron [...]
Novel organic-inorganic nanohybrids based on poly(N,N-dimethyl acrylamide)-l-polyisobutylene amphiphilic polymer conetworks
Poly(N,N-dimethyl acrylamide)-l-polyisobutylene (PDMAAm-l-PIB) amphiphilic conetworks were synthesized. Thermal analysis (DSC), small angle X-ray scattering (SAXS) measurements and atomic force microscopy (AFM) investigations were made. Furthermore, we have successfully synthesized silver nanoparticles in the PDMAAm-l-PIB amphiphilic [...]
High-density polyethylene reinforced with titania nanoparticles
Bondioli F., Dorigato A., Fabbri P., Ferrari A.M., Messori M., Pegoretti A., Università di Modena e Reggio Emilia, IT
Titania nanoparticles were prepared by both hydrolysis of tetraethoxy titanium, in order to obtain a spherical shape, and by hydrothermal crystallisation. Nanoparticles were also surface modified with alkylsilanes in order to improve the compatibility with [...]
Universal platform for preparation of functional block copolymers
Block copolymers with hydrophilic and hydrophobic segments can assemble to generate a variety of nano-scale structures. Additionally, block copolymers have tremendous potential to improve the performance of commercial products in pharmaceuticals, cosmetics, adhesives and detergents [...]
Overview of Polymer Nanocomposites as Dielectrics and Electrical Insulation Materials for Large High Voltage Rotating Machines
Polymer nanocomposites are defined as polymers in which small amounts of nanometer size filers are homogeneously dispersed. In power industry, electrical insulating polymers usually incorporate inorganic fillers to achieve specific electrical, mechanical, thermal properties and [...]
Characterization of new type polymer composites prepared by in situ coffining electrospun fibers into polymer matrixes
A number of methods are available for preparing a fiber reinforced polymer composite from two or more polymer matrixes and fibers. Many difficulties (for example, increasing viscosity of processing fluid, homogeneity of fibers in the [...]
Structure Development in Flexible Polyurethane Foam Nanocomposites
This research involves in situ studies on the development of molecular and morphological structures during the processing of flexible, water-blown polyurethane foams containing layered silicate (montmorillonite) nanoparticles. Such materials possess enhanced mechanical properties combined with [...]
Electrochemical Impedance and Thermal Characterization of Nano-Reinforced Vinyl Chloride/Vinyl Acetate Coating
A poly(vinyl chloride/vinyl acetate) copolymer (VYHH) with and without multi walled carbon nanotubes (MWCNTs) as reinforcements was used as a coating for steel substrates in order to evaluate its barrier properties against corrosion. Electrical impedance [...]
The anti-ultraviolet nano-fibers formed during electrospinning
In this study, electrospinning is a straightforward method to produce anti-ultraviolet polymer fibers. The new types of anti-ultraviolet nano-fibers were produced by polylactic acid (PLA) and benzophenone. We also used different anti-ultraviolet nano particles (TiO2, [...]
Reactive block copolymers as versatile compatibilizers for polymer-clay nanocomposites
Flores-Santos L., González-Montiel A., Baeza-Alvarado M.D., Espinoza-Rodríguez E., Esparza-Hernández P., CID, Centro de Investigación y Desarrollo Tecnológico, S.A. de C.V., MX
It’s well known that silicate-polymer nanocomposites offer a number of significant advantages over traditional silicate-polymer composites, such as increased tensile strength, improved heat deflection temperature and flame retardance, with typically 3-5 wt.% of the nanofiller, [...]
Novel Approach for Preparation of Organic-Inorganic Hybrid Nanocomposites
Novel organic-inorganic hybrid nanocomposites were synthesized through emulsion grafting polymerization in the presence of silica particles coated with methacryloxy(propyl)trimethoxysilane. Well-defined polymer chains were grown from the nanoparticle surfaces to yield individual particles composed of a [...]
Preparation and characterization of highly porous PVDF nanofibers and yarns
Andrukh T., Few C., Burtovyy O., Burtovyy R., Burtovyy O., Burtovyy R., Luzinov I., Kornev K., Clemson University, US
Unique highly porous Polyvinylidene difluoride (PVDF) nanofibers (Figure 1) of about 50-500 nm in diameter were prepared by electrospinning. Electrospinning setup (Figure 2) allows us to control the nanofiber placement on the gap-type electrodes. In [...]
Study of the ferroelectric properties for PVDF using DFT Theory
Ortíz E., Cuán A., Badillo C., Wang Q., Noreña L., Universidad Autonoma Metropolitana-Azcapotzalco, MX
Polyvinylidene fluoride (PVDF) exhibits piezoelectricity effect. In this work, it is presented a theoretical study of some properties of this material which were calculated by Density Functional Theory (DFT). Among those properties are: polarizability, dipolar [...]
Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2008: Life Sciences, Medicine & Bio Materials – Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 2
Published: June 1, 2008
Industry sectors: Advanced Materials & Manufacturing | Personal & Home Care, Food & Agriculture
Topic: Personal & Home Care, Food & Agriculture
ISBN: 978-1-4200-8504-4