The synthesis of iron oxide nanoparticles (NPs) by thermal decomposition precursors using oleic acid as surfactant has evolved to a state-of-the-art method produce monodisperse, spherical NPs. principles behind such monodisperse syntheses are well-known: the key is separation between burst nucleation and growth phase, whereas size population set precursor-to-surfactant ratio. Here we follow pentacarbonyl in presence via situ X-ray scattering. This allows reaction kinetics precursor states be...

A new, simple and highly versatile method for the surface modification of luminescent cadmium selenide nanoparticles (CdSe NPs) based on 1,3-dipolar cycloaddition reactions is described. Uniform, trioctylphosphine oxide (TOPO)-covered CdSe NPs were prepared subjected to two ligand-exchange reactions: first, ligand exchange was accomplished with pyridine, fully removing TOPO from surface. In a second step, either 1-[(3-azidopropyl)octylphosphinoyl]octane or hex-5-ynoic acid...

Superparamagnetic nanoparticles have been proposed for many applications in biotechnology and medicine. In this paper, it is demonstrated how the excellent colloidal stability magnetic properties of monodisperse individually densely grafted iron oxide can be used to manipulate reversibly solubility with a poly(N-isopropylacrylamide)nitrodopamine shell. “Grafting-to” “grafting-from” methods synthesis an irreversibly anchored brush shell monodisperse, oleic acid coated cores are compared....

Vibrational spectroscopy is a very suitable tool for investigating the plant cell wall in situ with almost no sample preparation. The structural information of all different constituents contained single spectrum. Interpretation therefore heavily relies on reference spectra and understanding vibrational behavior components under study. For first time, we show infrared (IR) Raman dibenzodioxocin (DBDO), an important lignin substructure. A detailed assignment molecule, based quantum chemical...

Self-assembly of core–shell nanoparticles (NPs) at liquid–liquid interfaces is rapidly emerging as a strategy for the production novel nano-materials bearing vast potential applications, including membrane fabrication, drug delivery and emulsion stabilization. The development such nanoparticle-based materials facilitated by structural characterization techniques that are able to monitor in situ self-assembly process during its evolution. Here, we present an high-energy X-ray reflectivity...

The promising applications of core–shell nanoparticles in the biological and medical field have been well investigated recent years. One remaining challenge is characterization structure hydrated polymer shell. Here we use small-angle X-ray scattering (SAXS) to investigate iron oxide core–poly(ethylene glycol) brush shell with extremely high grafting density. It shown that density profile can be described by a scaling model takes into account locally very near core. A good fit constant...

Cellulose II gels from a stream of the Lyocell fiber process were transformed into spherical nanoparticles by carboxymethylation and subsequent homogenization.

A grafting method that produces melt-like densities of stabilizing PEG-brushes on superparamagnetic nanoparticles, <italic>e.g.</italic> for biomedical applications.

Fundamental research on nanoparticle (NP) interactions and development of next-generation biomedical NP applications relies synthesis monodisperse, functional, core-shell nanoparticles free residual dispersants with truly homogeneous controlled physical properties. Still, purification e.g. such superparamagnetic iron oxide NPs remain a challenge. Comparing the success different methods is marred by sensitivity analysis to purity product. We synthesize oleic acid (OA)-capped, Fe3O4 in size...

We have developed a new concept to effect nanoparticle binding on surfaces by use of directed, specific molecular interactions. Hamilton-type receptors displaying strength approximately 10(5) M(-)(1) were covalently fixed onto self-assembled monolayers via Sharpless-type "click" reactions, thus representing an efficient method control the densities ligands over range from low complete surface coverage. Au nanoparticles covered with matching barbituric acid bound high selectivity this...

Hydrophilic polymer-coated iron oxide nanoparticles are potential materials for a plethora of applications in the biotechnological field. Typical such polymers, e.g. dextran or poly(ethylene glycol), lack ability to tailor biological response an environmental trigger, while common responsive polymers as poly(N-isopropylacrylamide) poly(acrylic acid) not suitable biomedical applications. We present synthesis and characterization superparamagnetic with thermoresponsive polyoxazoline brushes...

Wood, as the most abundant carbon dioxide storing bioresource, is currently driven beyond its traditional use through creative innovations and nanotechnology. For many properties micro- nanostructure plays a crucial role one key challenge control detection of chemical physical processes in confined microstructure nanopores wooden cell wall. In this study, correlative Raman atomic force microscopy show high potential for tracking situ molecular rearrangement wood polymers during compression....

The incorporation of modified bacterial cellulose derived from agricultural waste improves biodegradable composites by reducing oxygen permeability and accelerating biodegradation while maintaining mechanical properties.

Thermoresponsive nanoparticles are promising smart materials for many applications. However, a rational design applications requires deeper understanding and experimental verification of the various parameters that influence thermoresponsiveness spherical polymer brushes define most such nanomaterials. Therefore, we investigate superparamagnetic iron oxide (SPION) grafted with poly(2-isopropyl-2-oxazoline) (6–33 kg mol−1) by temperature-cycled dynamic light scattering differential scanning...

Emerging biomedical applications such as molecular imaging and drug delivery often require directed binding of nanoparticles to cell-membrane receptors. The specific apparent affinity ligand-functionalized particles is size-dependent, an observation so far solely attributed multivalent receptor–ligand interaction. We question the universality this explanation by demonstrating that kinetics also depends on weak, attractive colloidal-type interaction between a lipid membrane. Applying...

The morphology and topology of thermoresponsive polymers have a strong impact on their responsive properties. Grafting onto spherical particles has been shown to reduce responsiveness transition temperatures; grafting block copolymers that switchable or retained wettability surface particle during desolvation one can take place. Here, doubly were grafted spherical, monodisperse, superparamagnetic iron oxide nanoparticles investigate the effect thermal brushes copolymers. By inverting order,...

Thermoresponsive polypeptoids are promising candidates for medical applications due to their biomimetic properties. When such polymers grafted on magnetic nanoparticles, materials can be obtained that combine a temperature‐triggered solubility transition with extraction. The synthesis of monodisperse, superparamagnetic iron oxide nanoparticles is described densely surface‐grafted polypeptoid shells have tunable thermoresponsive colloidal stability. combines ligand exchange controlled...

The need to switch bio-based, biodegradable and/or fully recyclable polymers is becoming increasingly clear, especially in the area of food packaging, which a major contributor plastic pollution.

Abstract Summary: This publication discusses the development of new methods for producing organic‐inorganic core‐shell‐nanoparticles (NP's) via a combination “grafting‐from” techniques and living cationic polymerization reactions. Based on surface initiated, quasiliving isobutylene, polymeric shells polyisobutylene (PIB) were attached onto nanoparticles (silica NP's different sizes, r = 12–40 nm) with high degree precision. “Grafting‐from” provides an ideal method to control number polymer...

We report on the grafting-from living cationic polymerization of isobutylene from SiO2-nanoparticles surfaces. After modification NP-surfaces (SiO2; 6 nm) initiators (I) for (IB) were grafted onto NP surface in variable densities (0.1−0.85 molecules initiator/nm2). With densely packed (0.85 initiator/nm2) PIB-brushes with controlled molecular weights (5000−50 000 g mol−1) could be obtained. Various concentration-ranges initiator-moieties solution as well studied, revealing a process only...

Abstract Summary: Polymersomes are self assembled vesicles composed of fully synthetic amphiphilic diblock copolymers. Many their properties similar to lipid vesicles, although with often higher thermal and mechanical stability within curved membrane. Incorporation nanosized objects into hydrophilic interior or hydrophobic membrane represents an important method for functionalization these biomimetic structures. We report on the embedding gold nanoparticles (Au‐NPs) polymersomes....