Timothy Thatt Yang Tan

Nanyang Technological University | ntu · School of Chemical and Biomedical Engineering

All inorganic CsPbBr3 superstructures (SSs) have attracted much research interest due to their unique photophysical properties, such as their large emission red-shifts and super-radiant burst emissions. These properties are of particular interest in displays, lasers and photodetectors. Currently, the best-performing perovskite optoelectronic device...

The formation of core-shell heterostructures allows direct contact for more efficient energy transfer and requires exquisite lattice match. Lattice mismatch is one of the most challenging obstacles for combining two components with different phases. In this work, we develop a strategy to successfully overcome the limitation of lattice mismatch for...

Currently, there is no effective method to prevent the formation of hypertrophic scars and keloids, which can cause severe physical and psychological burdens to patients. Secreted protein acidic and cysteine-rich (SPARC) is involved in wound fibrosis by modulating fibroblast functions, causing excessive collagen deposition during wound healing. Thu...

All-inorganic perovskite superstructures (SCs) were recently reported to have formed through the self-assembly of perovskite nanocrystals (NCs) in hot injection synthesis. The presence of SCs leads to miniband formation in both conduction and valence bands and a red-shifted emission. The formation process of SCs is highly attractive and has so far...

Small interfering RNA (siRNA) therapy is a promising epigenetic silencing strategy. However, its widespread adoption has been severely impeded by its ineffective delivery into the cellular environment. Here, a biocompatible injectable gelatin-based hydrogel with positive-charge tuned surface charge is presented as an effective platform for siRNA pr...

The emergence of near-infrared-II (NIR-II) activated photomedicines has extended the penetration depth for noninvasive theranostics, especially for photothermal nanomedicines. The current early development stage for NIR-II activated photomedicines has focused on creating a greater variety of photothermal agents (PTAs) with superior photothermal con...

Tuning the configuration of lanthanide-doped upconversion nanoparticles (UCNPs) has been proven to be an effective approach to enhance upconversion (UC) efficiency, especially for neodymium (Nd3+)-sensitized UCNPs. Rational configuration design can spatially separate activators and sensitizers, achieving the evolution from single core to multilayer...

The optogenetic neuron ablation approach enables noninvasive remote decoding of specific neuron function within a complex living organism in high spatiotemporal resolution. However, it suffers from shallow tissue penetration of visible light with low ablation efficiency. This study reports a upconversion nanoparticle (UCNP)–based multiplex proteins...

Neodymium (Nd³⁺)‐sensitized nanoconstructs have gained increasing attention in recent decades due to their unique properties, especially optical properties. The design of various Nd³⁺‐sensitized nanosystems is expected to contribute to medical and health applications, due to their advantageous properties such as high penetration depth, excellent ph...

Near-infrared (NIR) light penetrates tissue deeply, but its application to motor behavior stimulation has been limited by the lack of known genetic NIR light-responsive sensors. We designed and synthesized a Yb3+/Er3+/Ca2+-based lanthanide-doped upconversion nanoparticle (UCNP) that effectively converts 808 nm NIR light to green light emission. Thi...

Graphene quantum dots (GQDs), as a unique category of zero-dimensional (0D) carbon nanomaterial, has ignited tremendous interest in the past few years owing to its gorgeous electronic and physicochemical properties in conjunction with quantum-confinement and edge effects. In this review article, we predominantly focus on the recent developments of...

Recent years have witnessed a cornucopia toward the synthetic fabrication of carbon-metal nanocomposites; nonetheless, cooperative synergy of carbon nanomaterials and metal nanocrystals at zero dimension is still elusive. To this end, we perform a controllable structural design comprising of customizable alternate layers of active and functional ze...

Significacne: Currently the most common sources of collagen are of bovine and porcine origins, although the industrial use of collagen obtained from non-mammalian species is growing in importance, particularly since they have a lower risk of disease transmission and are not subjected to any cultural or religious constraints. However, unmodified co...

Adipose tissue is a rich source of extracellular matrix (ECM) material that can be isolated by delipidating and decellularizing the tissue. However, the current delipidation and decellularization methods either involve tedious and lengthy processes or require toxic chemicals, which may result in the elimination of vital proteins and growth factors...

Nd(3+)-sensitized upconversion nanoparticles are amongst the most promising emerging fluorescent nanotransducers. They are activated by 808 nm irradiation, which features merits such as limited tissue overheating and deeper penetration depth, hence attractive for diagnostic and therapeutic applications. Recent studies indicate that ultrasmall nanop...

A layer-by-layer (LbL) assembly of highly ordered nitrogen-doped graphene quantum dots (N-GQDs)/ZnO nanowire (NW) heterostructures was demonstrated as a high performance photoanode in photoelectrochemical (PEC) hydrogen generation for the first time. The nitrogen doping of GQDs was achieved by a facile synthesis strategy under ambient conditions, b...

Bandgap engineering is an important strategy for tailoring the optical and electronic properties of semiconductor nanocrystals. This work describes the first solution proton alloying process for tuning the bandgap energy of ternary sulfide nanocrystals at room temperature. The proposed strategy circumvents the use of toxic heavy metal ions, while m...

Covalent bonding of graphene oxide quantum dots (GOQDs) onto amino modified polyvinylidene fluoride (PVDF) membrane has generated a new type of nano-carbon functionalized membrane with significantly enhanced antibacterial and antibiofouling properties. A continuous filtration test using E. coli containing feedwater shows that the relative flux drop...

Conventional techniques for the synthesis of oriented polyaniline (PANI) nanostructures are often complex or time consuming. Through an innovative reduced graphene oxide (rGO) modified FTO and a low-potential electropolymerization strategy, the rapid and template-free growth of a highly ordered PANI nanorod array on the FTO substrate is realized. T...

The Hildebrand solubility parameters of amidium ionic liquids were investigated using the approach of intrinsic viscosity. It was discovered that the nature of the anion influences the Hildebrand solubility parameters by which distillable trifluoromethanesulfonate- (TfO-) based ionic liquids present higher Hildebrand solubility parameters than bis(...

We present a new approach to directly grow uniform and highly-ordered TiO2 nanosheets array (NSA) on a low-cost flexible carbon cloth substrate while simultaneously fulfill precise TiO2 nanostructure tailoring and crystal phase control. The unique vertically-erected TiO2 NSA/carbon cloth with hierarchical structures was directly explored as electro...

Objective Although photoelectrochemical (PEC) water splitting heralds the emergence of the hydrogen economy, the need for external bias and low efficiency stymies the widespread application of this technology. By coupling water splitting (in a PEC cell) to a microbial fuel cell (MFC) using Escherichia coli as the biocatalyst, this work aims to succ...

A 3D injectable hydrogel-bioceramic composite consisting of gelatin-3-(4-hydroxyphenyl) propionic acid (Gtn-HPA) and carboxymethyl cellulose-tyramine (CMC-Tyr), incorporated with fish scale-derived calcium phosphate (CaP), is developed for bone applications. The hydrogel-bioceramic composite has significantly improved the elastic modulus compared t...

A one-step in situ tailoring of NiCo2S4 nanostructures is demonstrated on fluorine-doped tin oxide (FTO) as Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) with performance surpassing that of a conventional Pt-sputtered CE. An interconnected NiCo2S4 nanosheet network is successfully constructed on the FTO glass via a hydroth...

Single-crystalline-like P-N type CuInS2/NaInS2 heterogeneous nanosheets were synthesized by partial cation exchange reaction and show highly improved photocatalytic H2 evolution activity attributed to the increased efficiency of interfacial charge transfer.

An international symposium for nanosafety was held recently at the Nanyang Technological University in Singapore. Topics relating to understanding nanomaterial properties, tools, and infrastructure required for predicting hazardous outcomes, measuring nanomaterial exposure levels, systems approach for risk assessment and public’s perception of nano...

This work reports a simple strategy to prepare Au@TiO2 core–shell hollow spheres with well-defined morphology by combining an in-situ hydrothermal reduction technique with the adsorption of Ti4+ ions onto carbon spheres via a hard template strategy. H2 evolution measurements suggest that the prepared Au@TiO2-2 (2.0 wt%) hollow spheres exhibited rem...

Multifunctional lanthanide-based nanomaterials are envisioned to create a huge impact in nanomedicine through improved diagnosis and treatment of diseases. This review focuses on the opportunities and advantages afforded by "designer" lanthanide-based nanomaterials in medical application in the recent 5 years. We begin with a brief overview of the...

The total and partial solubility parameters (dispersion, polar and hydrogen-bonding solubility parameters) of ten ionic liquids were determined. Intrinsic viscosity approaches were used that encompassed a one-dimensional method (1D-Method), and two different three-dimensional methods (3D-Method1 and 3D-Method2). The effect of solvent type, the dime...

The current work reports a type of “smart” lanthanide-based theranostic NaDyF4:Yb3+/NaGdF4:Yb3+,Er3+ nanoprobes, which are able to circumvent the up-converting poisoning effect of Dy3+ ions to give efficient near infrared (980 nm) triggered up-conversion fluorescence, and offers not only excellent dark T2-weighted MR contrast but also tunable brigh...

Since rates of tissue growth vary significantly between tissue types, and also between individuals due to differences in age, dietary intake, and lifestyle-related factors, engineering a scaffold system that is appropriate for personalized tissue engineering remains a significant challenge. In this study, a gelatin-hydroxyphenylpropionic acid/carbo...

A three dimensional chitosan/vacuum-stripped graphene/polypyrrole interface with a hierarchical porous structure was fabricated as a free-standing and flexible electrochemical sensing electrode for dopamine detection, which exhibits unprecedented good selectivity, high sensitivity (632.1 μA mM−1 cm−2), wide linear response range (0.1–200 μM), low d...

A new generation of triazole-bridged bilayer cyclodextrins (CDs) chiral stationary phase (CSP) material was constructed via a surface-up 'click' approach. The synergistic effect of the tandem-inverted duplex CDs was evidenced by the superior enantioresolution ability toward selected chiral compounds and the enhanced adsorption ability toward hesper...

A simple one-pot method to prepare complex morphology-tunable hierarchical TiO2 microspheres consisting of radially assembled single-crystalline rutile TiO2 nanorods is developed by combining an acid thermal crystallization process and a self-assembly process of the nanorods via a solvothermal amphiphile–water microreactor strategy. Using P25 nanop...

This work is the first demonstration of a simple thiol-ene click chemistry to anchor vinyl imidazolium β-CD onto thiol silica to form a novel cationic native cyclodextrin (CD) chiral stationary phase (CSP). The CSP afforded high enantioseparation ability towards dansyl (Dns) amino acids, carboxylic aryl compounds and flavonoids in chiral HPLC. The...

Conducting AFM reveals a continuous conduction network of a TiO2 -graphene composite in DSSC due to a more intimate contact between the smaller sized TiO2 -graphene composite nanosheets,which reduces the internal resistance at TiO2 /TiO2 and TiO2 /FTO interfaces and ultimately leads to a faster and more efficient electron transport in the photoanod...

The utilization of metallic nanoparticles is one of the key strategies to improve the performance of photovoltaic devices. In this work, we elucidate the power conversion efficiency (PCE) enhancement mechanism by gold nanoparticles (Au-NPs) through a bilayer anodic buffer structure in polymer solar cells. The results show that the PCE of the device...

This study describes the preparation and characterization of a biodegradable 3D hydrogel constructed from hydroxypropyl cellulose (HPC), modified with bifunctional methacrylic anhydride (MA) to form hydroxypropyl cellulose methacrylate (HPC-MA), for adipose tissue engineering applications. The hydrogels were prepared from three different concentrat...

WO3-reduced graphene oxide (WO3-RGO) heterojunction electrodes were prepared for photoelectrochemical (PEC) overall water splitting. The WO3 photoanode incorporated with RGO showed significantly enhanced PEC properties and, hence, photocatalytic water splitting, compared to the bare WO3 at a bias larger than 0.7 V vs. Ag/AgCl, while a decrease in t...

Uniform single-crystalline quaternary sulphide nanoring photocatalysts are synthesized via the copper-ion-induced Kirkendall effect and is followed by a cation exchange reaction. The obtained Cu2+ -doped ZnIn2 S4 nanorings show highly preserved morphology, and demonstrate high visible-light-driven photocatalytic activity for H2 evolution in water s...

The current work demonstrates that native α-cyclodextrin, anchored onto sub-2 μm silica particles via "click" reactions and packed into a 5 cm column, was found to be effective for the resolution of 11 pairs of dansyl-dl-amino acids (DAAs) using ultra-high performance liquid chromatography (UHPLC). All DAAs were completely or partially separated on...

Lanthanide nanocrystals have demonstrated strong potentials in nanomedicine due to its up-conversion and strong magnetic properties, and low toxicity. This talk will focus on strategies in lanthanide nanostructure tailoring to achieve up-conversion color emission tuning, MRI T1 and T2 contrast tuning, and the use of up-conversion fluorescence in dr...

Pre-vascularization of scaffolds using endothelial cells (ECs) and preservation of hemocompatibility are effective strategies to improve the long-term viability of tissue engineered constructs. The current work reports a multifunctional titanium (Ti) surface for simultaneous enhancement of EC selectivity while preserving hemocompatibility. This is...

Reducing the thrombogenicity of a tissue-engineered vascular graft prior to implantation is important for improving graft patency. As functionalization of synthetic materials with cell-adhesive proteins is routinely utilized as a means to promote endothelial cell (EC) growth, we conducted detailed investigations into the proliferation and thromboge...

We report ultrasensitive sub-10 nm NaMnF(3) nanocrystals codoped with Yb(3+), Er(3+)/Tm(3+) ions, and their intense pure red and near-infrared upconversion emissions in the presence of Mn(2+). The nanocrystals showed excellent T(1) contrast in 7 T MRI, implying their potential as single-phase contrast agents for fluorescent deep tissue and MR imagi...

The current article reviews the development and applications of novel cyclodextrin chiral stationary phases (CD-CSPs) in liquid chromatography (LC), capillary electrochromatography (CEC), gas chromatography (GC) and supercritical fluid chromatography (SFC) over the period of January 2007 to March 2012. The synthetic routes of CD-CSPs, as well as th...

The bioanode is the defining feature of microbial fuel cell (MFC) technology and often limits its performance. In the current work, we report the engineering of a novel hierarchically porous architecture as an efficient bioanode, consisting of biocompatible chitosan and vacuum-stripped graphene (CHI/VSG). With the hierarchical pores and unique VSG,...

This work reports an efficient visible and UV-light-activated boron and nitrogen codoped TiO2 porous film prepared via a “green” and direct coating approach. Such photocatalyst is highly promising for solar depollution application due to its efficient photocatalytic activities in both visible and UV spectrum. The preparation method avoids the use o...

Near infrared-induced drug release and cancer therapy using inorganic nanoparticles have generated much interest because near infrared (NIR) radiation is safe to the body and can penetrate deeper into tissues. [ 1–3 ] Of the various kinds of nanoparticles available, gold nanoparticles have been utilized in a NIR-mediated hyperthermia system to kill...

Nanomedicine: NIR-active N-TiO(2) /NaYF(4) :Yb,Tm nanocomposites (NCs) were synthesized for the first time and its potential applications in drug release and targeted cancer cell ablation are explored. Upon 980 nm laser irradiation, the anti-cAngptl4 Ab-conjugated N-TiO(2) /NaYF(4) :Yb,Tm NCs shows a significant increase in apoptotic A-5RT3 cells w...

The current work reports single-phase, terbium-doped sodium dysprosium fluoride (NaDyF 4:Tb 3+) nanocrystals with green luminescence and good T 2 contrast in 7.0-T MRI phantom and animal imaging. The current nanocrystals demonstrate good potential as a dual modal contrast agent for high-field magnetic resonance (MR) and fluorescence imaging. Dual-m...

Nanosized hydroxyapatite (nHA) has been proposed as drug delivery vehicles because of its biocompatibility. While the possible risks of nHA inducing inflammation have been highlighted, the specific influence of varying nHA particle morphology is still unclear. In order to establish this understanding, nHA of four different shapes-needle (nHA-ND), p...

TiO(2)-InVO(4) nanostructured films were coated onto glass substrates and systematically investigated for their bactericidal activities using Escherichia coli (E. coli) as the model bacterium under ambient light illumination. The uniform TiO(2)-InVO(4) nanostructured films were prepared using titanium isopropoxide (TTIP) as the precursor via a simp...

We present a one-step solvothermal approach to prepare uniform graphene-TiO(2) nanocomposites with delicately controlled TiO(2) nanostructures, including ultra-small 2 nm nanoparticles, 12 nm nanoparticles and nanorods. Using three composites as photoanode materials, the effect of nanostructure of graphene-composited TiO(2) on the performance of dy...

Surface functionalization-enhanced spillover effect on hydrogen storage behaviors of Ni–B nanoalloy-doped activated carbon is investigated in comparison to the 3D graphene-based material. It is discovered that the hydrogen storage capacity of the activated carbon increases from Ni–B nanoalloy-doping but much less than that of graphene. After surfac...

Fully or partially sub-2 μm porous silica materials have garnered strong interests as column packing materials in separation and analytical technologies due to the promise of rapid separation, enhanced efficiency and separation resolution. Silica support materials of different morphology and sub-2 μm size have been developed to improve separation p...

The aim of this study was to investigate the feasibility of the inverse micelles (IM) technique in producing protein-loaded calcium phosphate nanoparticles (CaP NPs), and to compare this technique with the conventional co-precipitation (co-ppt) technique. In this study, bovine serum albumin and lysozyme were used as model proteins. The results show...

Additional data not shown in the manuscript are available as supporting information.

Epigallocatechin gallate (EGCG) originated from green tea is well-known for its pharmaceutical potential and antiproliferating effect on carcinoma cells. For drug delivery, EGCG in a micro-/nanoparticle form is desirable for their optimized chemopreventive effect. In this study, first time reports that EGCG microparticles produced by low temperatur...

Fluorescent optical probes have been intensively used in the area of bio-imaging. In this review article, we describe the recent advancements in the synthesis and application of bimodal magnetic-fluorescent probes for bioimaging. The bimodal probes consist of fluorescent [semiconducting quantum dots (e. g., CdSe/ZnS) or rare-earth doped (e. g., NaY...

We demonstrate a general strategy to prepare Bi(2)WO(6)/Ag/N-TiO(2) film with double visible-light-active components bridged by Ag nanoparticles as an electron shuttle, which exhibits enhanced photocatalytic activity and photoelectrochemical performance under visible light.

We describe an effective and simple protocol that uses click chemistry to attach native β-cyclodextrin (β-CD) to silica particles, resulting in a chiral stationary phase (CCNCSP) that can be used for the enantioseparation of chiral drugs by high-performance liquid chromatography (HPLC). Starting from β-CD, the CCNCSP is prepared in several steps: (...

This work reports the preparation of porous and visible-light absorbing Bi2WO6/TiO2 heterojunction films as a photoelectrode and their photoelectrochemical and photocatalytic performances. The Bi2WO6 underlayers with high surface roughness were prepared by a superhydrophilicity-assisted method. The Bi2WO6/TiO2 bilayer films showed high interface ar...

Ultrasmall terbium ions (Tb3+) doped dysprosium oxide (Dy2O3) nanocrystals (NCs) of 3 nm diameter have been synthesized and applied as a single-phase dual modality contrast agent for high field magnetic resonance imaging (MRI) and optical imaging. The NCs show excellent positive contrast at 7.0 T MRI in phantom and in vivo imaging in a mouse breast...

An organic-free sol-gel method was developed to synthesize crack-free, high surface roughness and visible-light-active C-N-codoped TiO(2) films. These films were subsequently evaluated for its photodegradation efficient using stearic acid as the model pollutant compound. The current approach avoids the use of hazardous organic solvents and employs...

This work reports the application of ultra-high pressure liquid chromatography (UHPLC) for reasonably fast enantiorecognition of some dansyl amino acids by employing three cationic β-cyclodextrins (β-CDs) as chiral additives. Good resolutions were obtained on an Agilent C18 column (2.1 mm i.d.; 1.8 μm; 50 mm length) with 1% (v/v) triethylammonium a...

Mesoporous silica particles of relatively uniform sub-1-micron size (0.6-0.9 μm) were successfully prepared by a modified synthesis strategy and applied in chiral separation in an ultra-high pressure liquid chromatography system. These particles were prepared via a ternary surfactant system (Pluronic P123, F127 and hexadecyltrimethyl-ammonium bromi...

This communication reports the preparation of two new cyclodextrin (CD) chiral stationary phases (CSPs): heptakis(6-deoxy-6-azido)-β-CD and heptakis(6-deoxy-6-azido-phenylcarbamoylated)-β-CD CSPs that perform quite differently to our previously reported "click" immobilized CD-CSPs. These CSPs are sterically congested at the narrow mouth of the CD a...

Two cyclodextrin-based chiral stationary phases have been prepared by immobilization of functionalized mono-6-azido-beta-CD derivatives to alkynyl modified silica via "click" chemistry and applied to the HPLC enantioseparation of various chiral compounds. The perphenylcarbamated CD CSP (CCP-CSP) exhibited excellent chiral recognition of a wide rang...

A novel and environmental friendly method was developed to prepare transparent, uniform, crack-free and visible light activated nitrogen doped (N-doped) titania thin films without the use of organic Ti precursors and organic solvents. The N-doped titania films were prepared from heating aqueous peroxotitanate thin films deposited uniformly on super...

New single-isomer, cationic beta-cyclodextrins, including mono-6-deoxy-6-pyrrolidine-beta-cyclodextrin chloride (pyCDCl), mono-6-deoxy-6-(N-methyl-pyrrolidine)-beta-cyclodextrin chloride (N-CH(3)-pyCDCl), mono-6-deoxy-6-(N-(2-hydroxyethyl)-pyrrolidine)-beta-cyclodextrin chloride (N-EtOH-pyCDCl), mono-6-deoxy-6-(2-hydroxymethyl-pyrrolidine)-beta-cyc...

We demonstrate a simple synthetic strategy for the fabrication of single-phase rare earth (RE) doped gadolinium oxide (Gd(2)O(3):RE where RE = terbium (Tb), ytterbium (Yb), and erbium (Er)) nanorods (NRs) as multimodal imaging probes. The NRs are ultranarrow and exhibit both emission and magnetic characteristics. The Tb-doped and Yb/Er-codoped Gd(2...

Rapid and efficient enantioseparation of halogen aryl alcohols and beta-blockers propranolol and pindolol in packed bed CEC (p-CEC) using as-prepared submicron porous silica chiral stationary phases (CSPs) has been achieved. Monodispersed 0.66 and 0.81 microm chiral submicron porous silica spheres were prepared using tetramethoxysilane and hexadecy...

Herein, we describe the synthesis of functional and multifunctional nanoparticles (NPs), derived from our recent work, for bioimaging and biosensing applications. The functionalized NPs involve quantum dots (QDs), magnetic particles (MPs) and noble metal NPs for the aforementioned applications. A diverse silica coating approaches (reverse microemul...

The preparations of novel platinum and copper metallodendrimers are reported. Surface modified first generation (G0) poly(amidoamine) (PAMAM) dendritic Schiff base, prepared via a condensation reaction was coordinated with platinum chloride and copper chloride yielding [G0-Py(4)-[PtCl(2)](4)] (4D) and [G0-Py(4)-[CuCl(2)](7)] (7E) respectively. Thes...

A new class of fluorescent and superparamagnetic bifunctional nanocrystal has been successfully prepared by a facile, non-hydrolytic method. The synthesized Tb-doped γ-Fe2O3 nanocrystals are highly monodispersed with a diameter of 13 nm, show superparamagnetic behaviour with saturation magnetism strength of 30 emu g−1, and exhibit photoluminescence...

A novel positively charged single-isomer of beta-cyclodextrin, mono-6-deoxy-6-(3R,4R-dihydroxypyrrolidine)-beta-CD chloride (dhypy-CDCl), was synthesized and employed as a chiral selector for the first time in capillary electrophoresis (CE) for the enantioseparation of anionic and ampholytic acids. The effects of the running buffer pH, chiral selec...

A novel chiral stationary phase (CSP) was prepared by anchoring mono-6-azido-6-deoxyperphenylcarbamated beta-CD onto omega-alkynyl functionalized silica (5 microm) via organic soluble Cu(I)-catalyzed Click chemistry. The obtained CSP was thereafter packed into fused-silica capillary (100 microm id) with an effective length of 9 cm and tested in aqu...

A novel native beta-cyclodextrin chiral stationary phase was prepared via "click" chemistry with cuprous iodide-triphenylphosphine complex as the catalyst and applied for enantioseparation of Dns-amino acids, substituted phenyl and phenoxy group modified propionic acids, flavonoids, and some pharmaceutical compounds such as nimodipine, propranolol,...

The present study presents a new approach for evaluating in vitro cytotoxicity of nanoparticles. The approach is based on American National Standard ISO 10993-5. Hepatoma HepG2 and fibroblast NIH3T3 cell lines were incubated with nanoparticles, and their associated extracts were derived at 70 and 121 degrees C. Nanoparticles proposed as potential b...

The synthesis and characterization of various rare-earth (RE)-doped and codoped yttrium oxide (Y 2O 3) nanomaterials were undertaken in the current work. RE dopants such as terbium (Tb), europium (Eu), and erbium (Er) were successfully doped, and ytterbium (Yb)−Er was codoped into Y 2O 3 nanomaterials. The as-synthesized nanomaterials are highly di...

Nanostructured titanium dioxide (TiO(2)) porous films and nanotube arrays were prepared by atomic layer deposition (ALD) on porous anodic alumina (PAA) templates. The nanostructures were characterized by FESEM and XRD to investigate the structural and crystallographic characteristics. They were then evaluated as self-cleaning surfaces by comparing...

a b s t r a c t Click chemistry was applied to immobilize mono-azido-b-cyclodextrin derivatives onto the surface of sil-ica to give novel chiral stationary phases (CSPs). The desired CSPs showed high stability and excellent enantioseparation effects in capillary electrochromatography (CEC). In recent years, 1,2,3-triazole forming reactions—Click ch...

In this study, humic acid was mineralized and degraded photocatalytically in presence of bare TiO2 and silver loaded TiO2 (0.5–5.0at.% Ag). X-ray diffraction (XRD) and inductive coupled plasma (ICP) analysis confirm the complete photodeposition of silver over TiO2 by photodeposition method. X-ray photoemission spectroscopy (XPS) studies confirmed t...

The physical and optical properties of quantum dots (QDs) are governed by their particle size and shape. In this study, near-infrared-emitting PbSe QDs were synthesized with controlled size (between 7 and 12 nm) and shape (spheres, octahedrons/cubes), with tunable emission from 1200 to 1500 nm. The hydrophobic PbSe QDs were coated with a silica she...

Y2O3:Tb nanorods were obtained by self-assembly of nanocrystals using long-chain alkyl amines as the stabilizing agent. Spherical nanoparticles and nanorods can be selectively prepared by varying the synthesis parameters, including the reaction temperature and time or the ratio of yttrium precursors to amine. X-ray diffraction (XRD), transmission e...

This article first indicates the various types of temperature-induced oxygen isotopic exchange (OIE) that can occur between labeled gaseous O2 and solid oxides. Earlier main results of light-induced OIE with semiconductor oxides are then briefly reviewed. The core of the article reports new results about the use of light-induced OIE to assess (i) t...

The robust, non-cytotoxic, silica-coated method was used to prepare CdSe quantum dots with efficient photoluminescence. Varying the amount of water and ammonia in the microemulsion also affected the silica shell thickness, since this altered the aqueous domain size. High-resolution TEM (HRTEM) images of SiO2/CdSe illustrated the crystal lattice fri...

The photocatalytic reduction of selenate Se(VI) ions was studied using unmodified TiO2 and Ag-loaded TiO2 (Ag-TiO2) photocatalysts. In the presence of formic acid, both the TiO2 and Ag-TiO2 photocatalysts were effective in reducing Se(VI). The reaction proceeded through the reduction of Se(VI) ions to elemental selenium Se and then to hydrogen sele...