A versatile synthetic method based on solvothermal technique has been developed for the fabrication of TiO2 nanocrystals with different shapes such as rhombic, truncated spherical, dog-bone, and elongated bar. The central features our approach are use water vapor hydrolysis agent to accelerate reaction both oleic acid oleylamine two distinct capping surfactants which have binding strengths control growth nanoparticles. We also show that presence an appropriate amount along desired...

Monodisperse samaria nanospheres and nanorods have been synthesized from commercial bulk Sm2O3 powders various capping long-chain alkyl acids (e.g., oleic acid, myristic decanoic acid). The materials were characterized by X-ray diffraction, transmission electron microscopy, photoelectron spectroscopy (XPS), Fourier transform IR, thermogravimetric analysis, N2 adsorption/desorption isotherms was employed to characterize these materials. results revealed that the synthesis of consists two...

Silver orthophosphate nanocrystals with controlled particle size have been synthesized using a simple, reproducible and easily scaled up route based on the reaction between silver ions, oleylamine phosphoric acid. The obtained are highly uniform in exhibit high visible light activity for photodecomposition of organic compounds.

Metal oxide nanomaterials have been intensively pursued for modern science and nanotechnology. Control over the size shape of nanoparticles enables tunability their unique properties sought many useful applications. This review presents a comprehensive overview recent advances in shape-controlled synthesis colloidal nanoparticles. We introduce size- shape-dependent along with potential applications subsequent descriptions kinetic regime concepts formation monodisperse nanocolloids....

Simultaneous integration of light emission and iridescence into a semiconducting photonic material is attractive for the design new optical devices. Here, straightforward, one‐pot approach liquid crystal self‐assembly semiconductor quantum dots cellulose nanocrystal‐templated silica developed. Through careful balance intermolecular interactions between lyotropic tetraalkoxysilane/cellulose nanocrystal dispersion water‐soluble polyacrylic acid/mercaptopropionic acid‐stabilized CdS dots,...

The introduction of polymers into a chiral nematic cellulose nanocrystal (CNC) matrix allows for the tuning optical and mechanical properties, enabling development responsive photonic materials. In this study, we explored incorporation hydroxypropyl (HPC) CNC film prepared by slow evaporation. composite CNC/HPC thin films, CNCs adopt structure, which can selectively reflect certain wavelengths light to yield colored film. color could be tuned across visible spectrum changing concentration or...

Inspired by the natural hierarchical structures of chitin and cellulose found in nature, this Review summarizes recent progress to create biomimetic optical materials templated nanochitin compares it with developments using nanocellulose.

We have discovered that the self-assembly of cellulose nanocrystals (CNCs) into chiral nematic phases varies significantly with substrate and evaporation rate. These variables allow reflectance peak iridescent films CNCs mesoporous silica templated from to be tuned over a wide range wavelengths.

Nanocrystalline chitin has been used both as a soft template and the carbon nitrogen sources for preparing mesoporous nitrogen-doped materials with layered structure. The nanorods prepared by sequential deacetylation hydrolysis of fibrils isolated from king crab shells organized into nematic liquid-crystalline phase. Silica/chitin composites obtained sol–gel condensation silica in presence were carbonized etched to yield films that replicate organization nanocrystalline films. high degree...

Conductive chiral nematic cellulose composite materials have been fabricated<italic>via in situ</italic>oxidative chemical polymerization of pyrrole onto surface-modified mesoporous nanocrystal (CNC) films.

Periodic aerogels with a chiral nematic structure were obtained through the solidification of phase-separated cellulose nanocrystal suspensions.

A new solvo-hydrothermal method has been developed for the synthesis of uniform vanadium oxide nanocrystals (NCs) with various sizes and shapes in aliphatic amine/toluene/water using V(V) diperoxo alkylammonium complexes. The complex precursors were prepared from an ion exchange reaction gels tetraalkylammonium bromide water-toluene mixture H(2)O(2) solution commercial bulk V(2)O(5) powders as starting gel source. obtained VO(2) NC products characterized by means transmission electron...

A new solvothermal method has been developed for the synthesis of monodisperse SmVO4 and CeVO4 nanocrystals with controlled size shape. The obtained materials were characterized by X-ray photoelectron spectroscopy (XPS), diffraction (XRD), transmission electron microscopy (TEM), selected area (SAED) techniques. results reveal that uniform pure tetragonal phase can be achieved. To investigate oxidation states metals on mixed oxide nanocrystal surface, XPS technique was employed. exhibit only...

A general approach has been developed for the synthesis of monoclinic ErOOH and cubic Er2O3 structures with high yield controlled size shape via solvo-hydrothermal reaction erbium nitrate in water/ethanol/decanoic acid media. The phase was formed at relatively low temperature (120-140 degrees C); however, obtained higher (160-180 C). By simply tuning different experimental parameters, such as temperature, concentration decanoic precursor etc., sizes from 3 nm to microm, a variety shapes...

Different two-phase approaches have been developed for the synthesis of two classes monodisperse colloidal metal oxide nanocrystals (NCs): rare earth NCs and transition NCs. These routes were simple inexpensive, using salts instead organometallic compounds, with mild reaction conditions, easily controlled size shape, multigram-scale products. The obtained products characterized by transmission electron microscopy (TEM), selected area diffraction (SAED), X-ray (XRD), photoelectron spectra...

Photonic chitin membranes with the Bouligand structure are created from king crab endocuticles. Within cuticle membranes, nanofibrils organized into a left-handed chiral nematic to evolve colorful, circularly polarized iridescence. The photonic porous is used as platform make mesoporous silica and nitrogen-doped carbon replicas that mimic twisted nanofibril membranes.

Chiroptical luminescent hybrid films were made from the hydrothermal synthesis of N-containing carbon dots (N-CDs) and their co-assembly with cellulose nanocrystals (CNCs).

Structural colour is a phenomenon found in nature, which provides plants and animals with vibrant optical properties. The production of this based on the interaction incident light hierarchical organisation submicron- micron-sized layered structures. Cellulose nanocrystals (CNCs) are anisotropic building units formed by acid hydrolysis native cellulose microfibers, can disperse aqueous media to form photonic liquid crystal. One fascinating example appearance biomimetic supramolecular...

Abstract The fabrication of mesoporous black titanium dioxide (TiO 2− x ) with a chiral nematic organization core–shell nanorods is reported. Chiral templating TiO 2 nanoparticles onto gelatin‐functionalized cellulose nanocrystals (CNCs) followed by calcination yields carbonized /CNC helical materials that recover white replicas after carbon removal. hydrothermal surface reduction the traditional ascorbic acid affords freestanding . visible light active semiconducting structure constructed...

Iridescence in animals and plants often arises from structural coloration, which involves hierarchical organization of minerals biopolymers over length scales the visible spectrum, leading to diffraction light. In this work, discarded crustacean shells that are not known for their colors used produce photonic nanostructures large, freestanding chiral nematic mesoporous chitosan membranes with tunable iridescent color. Bioinspired by colorful nature, hydrogels Bouligand‐type fabricated...

Single-crystalline mixed metal oxide nanoparticles and 3D hierarchical mesocrystal microspheres of MnWO4 have been synthesized on a large scale by facile single-step hydrothermal method using Mn(NO3)2 Na2WO4 precursors, capping bifunctional amino acid biomolecules with different alkyl chain lengths, water or water/ethylene glycol medium. The resulting single-crystalline uniform shapes including bar, rod, square, quasi-sphere, sphere, hexagonal crystals were obtained tuning the synthetic...

A conventional and general route has been exploited to the high yield synthesis of many kinds highly crystalline metal oxide mixed nanocrystals with different morphologies including belt, rod, truncated-octahedron, cubic, sphere, sheet via hydrothermal reaction inorganic precursors in aqueous solution presence bifunctional 6-aminohexanoic acid (AHA) molecules as a capping agent. This method is simple, reproducible for preparation variety high-crystalline scale-up. The shape such CoWO4,...

Formation of hybrid Ag-TiO(2) nanocrystals (NCs) in which Ag clusters are uniformly deposited on individual TiO(2) NC surface has been achieved by using hydrophobic surfactant-capped NCs combination with a photodeposition technique. The population the can be controlled degree hydrophobicity (e.g., number vacant sites) while their size may altered simply varying irradiation time. A reversible change color resulting is induced alternating UV light and visible-light illumination; however,...