Octylamine Research Articles

Overcoming solubility limitations of nutraceutical compositions based on poorly-soluble phosphoethanolamine using ionic liquids approach

We present a strategy to improve the delivery and bioavailability of phosphoethanolamine (HPEA) nutraceuticals employing an ionic liquid (IL) strategy pairing HPEA as anion source with different counterions, including choline (Ch), arginine (AR), tetrabutylammonium (TBA), n-ethyl-butylamine (EBA), butylamine (BA), hexylamine (HA), octylamine (OA), and pentadecylamine (PDA). Among these, [TBA][PEA], [HBA][PEA], [HEBA][PEA], [HAR][PEA], and [Ch][PEA] fall within the definition of ILs. Additionally, 15 nonstoichiometric ionic compounds were prepared by adding excess HPEA or cation precursor to the 1:1 stoichiometric salt, where some led to the dicationic ILs [Ch]2[PEA] and [TBA]2[PEA], as revealed by spectroscopic results. All the newly prepared compounds exhibited improved aqueous solubility by at least 4–53 times over the commercial HPEA formulations (e.g., calcium salt, [Ca][PEA]2) that have poor solubility mainly due to high crystallinity. We found that the aqueous solubility of poorly-soluble HPEA can be greatly enhanced using IL-forms through pairing with suitable counterions, suggesting new fully water-miscible composition alternatives with potential improved bioavailability and delivery are possible.

Room-Temperature Formation of CdTeSe Magic-Size Clusters from Oleate-Capped CdTe Precursor Compounds via CdSe Monomer Substitution.

We report the first room-temperature synthesis of ternary CdTeSe magic-size clusters (MSCs) that have mainly the surface ligand oleate (OA). The MSCs display sharp optical absorption peaking at ∼399 nm and are thus referred to as MSC-399. They are made from prenucleation-stage samples of binary CdTe and CdSe, which are prepared by two reactions in 1-octadecene (ODE) of cadmium oleate (Cd(OA)2) and tri-n-octylphosphine chalcogenide (ETOP, E = Te and Se) at 25 °C for 120 min and 80 °C for 15 min, respectively. When the two binary samples are mixed at room temperature and dispersed in a mixture of toluene (Tol) and octylamine (OTA), the CdTeSe MSC-399 develops. Also, when the CdSe sample is added to CdTe MSC-371 in a dispersion, the transformation from CdTe MSC-371 to CdTeSe MSC-399 is seen. We propose that the MSCs develop from their precursor compounds (PCs) that are relatively transparent in optical absorption, such as CdTeSe MSC-399 from CdTeSe PC-399 and CdTe MSC-371 from CdTe PC-371. The formation of CdTeSe PC-399 undergoes monomer substitution and not anion exchange, which is the reaction of CdTe PC-371 and the CdSe monomer to produce CdTeSe PC-399 and the CdTe monomer. Our study provides evidence of monomer substitution for the transformation from binary CdTe to ternary CdTeSe PCs.

Molecular design direction of organic spacer cations for low-dimensional organic–inorganic hybrid perovskite thin film transistors

Organic spacer cations in low-dimensional organic–inorganic hybrid perovskites (LDPVKs) significantly affect the performance of perovskite materials and devices. Herein, we systematically examine the effects of four distinct organic spacer cations on the properties of materials and perovskite thin film transistors (TFTs). Our study explores the consequences of varying chain lengths, including butylamine (BA) and octylamine (OA), and also considers the impact of incorporating benzene rings, such as phenethylamine (PEA), as well as the influence of fluorine-substituted benzene ring side chains, as represented by fluorine-substituted phenethylamine (FPEA), within these organic spacer cations. The results show that long-chain organic cations such as alkyl-chain cations improve the stability of TFTs but does not improve its field effect mobility. Because it provides π-π stacking, the benzene ring cation improves the carrier mobility performance of LDPVKs. This significantly improves the electrical performance and stability of LDPVK TFTs, affording a field-effect mobility of 7.47 cm2/(V·s) and the threshold voltage difference between the positive and negative sweep (ΔVTH) of 0.25 V. Therefore, when designing provide a molecular design direction for selecting organic spacer cations in low-dimensional for organic–inorganic hybrid perovskites, various factors should be considered to optimized. This work study guides the designing LDPVKs and improving the performances of field-effect devices in the future.

Novel Chiral CsPbBr3 Metal Halide Perovskite Magic-Sized Clusters and Metal Halide Molecular Clusters with Achiral Ligands.

We have synthesized inherently chiral cesium lead halide perovskite magic-sized clusters (PMSCs) and ligand-assisted metal halide molecular clusters (MHMCs) using the achiral ligands octanoic acid (OCA) and octylamine (OCAm). UV-vis electronic absorption was used to confirm characteristic absorption bands while circular dichroism (CD) spectroscopy was utilized to determine their chiroptical activity in the 412-419 and 395-405 nm regions, respectively. In contrast, the larger sized counterpart of PMSCs, namely, perovskite quantum dots (PQDs), do not show chirality. The inherent chirality of the clusters is tentatively attributed to a twisted chiral layered structure, defect-induced chiral structure, or twisted Pb-Br octahedra.

Stable Perovskite Solar Cells Based on Direct Surface Passivation Employing 2D Perovskites

Surface passivation of 3D perovskites with highly stable 2D perovskite is an effective strategy to improve both performance and stability of perovskite solar cells (PSCs). Herein, a new approach has been employed for the synthesis of oleic acid and octylamine‐assisted 2D perovskites TEA2PbX4 (X = I, Br) in antisolvent and directly used them for the surface passivation of MAFAPbI3 (3D) perovskite. The grain boundary and interface are both optimized in 3D/2D perovskite by 2D perovskite to improve surface morphology. It is found that the 2D perovskite effectively suppresses carrier recombination by reducing the defect density and facilitates interfacial charge extraction through better energy‐level alignments. As a result, power conversion efficiency of PSCs is boosted up to 18.56% and 19.87% for passivation with TEA2PbI4 and TEA2PbBr4, respectively. The passivated perovskite devices exhibit good thermal, operational, and long‐term stability in an ambient environment because of the material robustness of 3D/2D hybrid perovskites.

Thermally-Induced Isomerization of Prenucleation Clusters During the Prenucleation Stage of CdTe Quantum Dots.

The evolution of prenucleation clusters in the prenucleation stage of colloidal semiconductor quantum dots (QDs) has remained unexplored. With CdTe as a model system, we show that substances form and isomerize prior to the nucleation and growth of QDs. Called precursor compounds (PCs), the prenucleation clusters are relatively optically transparent and can transform to absorbing magic-size clusters (MSCs). When a prenucleation-stage sample at 25, 45, or 80 °C is dispersed in a mixture of cyclohexane (CH) and octylamine (OTA) at room temperature, either MSC-371, MSC-417, or MSC-448 evolves with absorption peaking at 371, 417, or 448 nm, respectively. We propose that PC-371 forms at 25 °C, and isomerizes to PC-417 at 45 °C and to PC-448 at 80 °C. The PCs and MSCs are quasi isomers. Relatively large and small amounts of OTA favor PC-371 and PC-448 in dispersion, respectively. The present findings suggest the existence of PC-to-PC isomerization in the QD prenucleation stage.

Thermally‐Induced Isomerization of Prenucleation Clusters During the Prenucleation Stage of CdTe Quantum Dots

AbstractThe evolution of prenucleation clusters in the prenucleation stage of colloidal semiconductor quantum dots (QDs) has remained unexplored. With CdTe as a model system, we show that substances form and isomerize prior to the nucleation and growth of QDs. Called precursor compounds (PCs), the prenucleation clusters are relatively optically transparent and can transform to absorbing magic‐size clusters (MSCs). When a prenucleation‐stage sample at 25, 45, or 80 °C is dispersed in a mixture of cyclohexane (CH) and octylamine (OTA) at room temperature, either MSC‐371, MSC‐417, or MSC‐448 evolves with absorption peaking at 371, 417, or 448 nm, respectively. We propose that PC‐371 forms at 25 °C, and isomerizes to PC‐417 at 45 °C and to PC‐448 at 80 °C. The PCs and MSCs are quasi isomers. Relatively large and small amounts of OTA favor PC‐371 and PC‐448 in dispersion, respectively. The present findings suggest the existence of PC‐to‐PC isomerization in the QD prenucleation stage.

Reactive extraction system: A study on recovery of itaconic acid using different natural oils

The current study explores the aptness of natural oils like sunflower oil, sesame oil, and ricebran oil as diluents for the extraction of itaconic acid using tri octylamine as extractants in the range of 0.228––0.687 (mol/L). Utmost average distribution coefficient was obtained as 8.69 for sunflower oil, 8.52 for sesame oil, and 9.66 for rice bran oil at 0.687 mol/L of tri octyl amine. Highest itaconic acid extraction efficiency is 91.52% when ricebran oil accompanied with 0.687 mol/l of tri octylamine. Thereby, rice bran oil along with tri octylamine is the appropriate solvent system for the extraction of itaconic acid from their aqueous solution. Further, the loading ratio values ϕ < 0.5 in maximum cases suggest 1:1 complex have formed between the extractant and the itaconic acid. At Higher itaconic acid concentrations in the range of 0.150–––0.250 (mol/L) and lower tri octylamine concentrations 0.228 (mol/L), loading ratio > 0.5 was observed which indicates that 2:1 and 3:1 acid-extractant complexes are formed.

Influence of Different Capping Agents on the Structural, Optical, and Photocatalytic Degradation Efficiency of Magnetite (Fe3O4) Nanoparticles.

Octylamine (OTA), 1-dodecanethiol (DDT), and tri-n-octylphosphine (TOP) capped magnetite nanoparticles were prepared by co-precipitation method. Powder X-ray diffraction patterns confirmed inverse spinel crystalline phases for the as-prepared iron oxide nanoparticles. Transmission electron microscopic micrographs showed iron oxide nanoparticles with mean particle sizes of 2.1 nm for Fe3O4-OTA, 5.0 nm for Fe3O4-DDT, and 4.4 nm for Fe3O4-TOP. The energy bandgap of the iron oxide nanoparticles ranges from 2.25 eV to 2.76 eV. The iron oxide nanoparticles were used as photocatalysts for the degradation of methylene blue with an efficiency of 55.5%, 58.3%, and 66.7% for Fe3O4-OTA, Fe3O4-DDT, and Fe3O4-TOP, respectively, while for methyl orange the degradation efficiencies were 63.8%, 47.7%, and 74.1%, respectively. The results showed that tri-n-octylphosphine capped iron oxide nanoparticles are the most efficient iron oxide nano-photocatalysts for the degradation of both dyes. Scavenger studies show that electrons (e-) and hydroxy radicals (•OH) contribute significantly to the photocatalytic degradation reaction of both methylene blue and methyl orange using Fe3O4-TOP nanoparticles. The influence of the dye solution's pH on the photocatalytic reaction reveals that a pH of 10 is the optimum for methylene blue degradation, whereas a pH of 2 is best for methyl orange photocatalytic degradation using the as-prepared iron oxide nano-photocatalyst. Recyclability studies revealed that the iron oxide photocatalysts can be recycled three times without losing their photocatalytic activity.

PVDF membranes containing alkyl and perfluoroalkyl-functionalized graphene nanosheets for improved membrane distillation

Polyvinylidene fluoride (PVDF) membranes containing hydrophobic graphene nanofillers were prepared and tested for membrane distillation applications. The nanofillers were obtained by a two-step process: 1st) chemical grafting of hydrophobic molecules, either octylamine (OA) or perfluoroctylamine (PFOA), to graphene oxide (GO) nanosheets, and 2nd) chemical reduction of functionalized GO (rGO) to remove unreacted oxygen-containing functional groups. This resulted in OA-functionalized reduced GO (OA-rGO) and PFOA-functionalized rGO (PFOA-rGO). The addition of these nanomaterials to PVDF membranes prepared by the phase inversion process led to an increase in the membrane contact angle, and therefore higher hydrophobicity, as well as an increase in the membrane porosity. When comparing both nanofillers, OA-rGO and PFOA-rGO, the latter was more efficient in achieving higher contact angles due to the presence of fluorine atoms, whereas OA-rGO led to a greater enhancement in membrane porosity as compared to PFOA-rGO. MMMs containing 0.7 wt% nanofiller loadings of OA-rGO and PFOA-rGO achieved the highest water fluxes of 9.1 and 8.8 L m−2 h−1, respectively and salt rejection above 99.9%, which was monitored for at least 162 h of operation for the former. In comparison with pure PVDF (flux of 5 L m−2 h−1), the addition of OA-rGO and PFOA-rGO nanofillers results in a flux increment of 82% and 76%, respectively.

Eco-efficient pickering foams: leveraging sugarcane waste-derived cellulose nanofibres

An illustrative overview depicting the derivation of TEMPO-oxidised cellulose nanofibres (CNF) from agricultural waste, along with foam generation and characterisation in the presence of octylamine (OA).

Biodegradable dual stimuli responsive alginate based microgels for controlled agrochemicals release and soil remediation

To meet the growing food demand of increasing world population while reducing the harmful environmental effects of agrochemicals, development of smart nanoformulation is of prime importance. Herein, dual stimuli responsive alginate based microgels (OAlgDP MGs) (≈160 nm) are developed for controlled release of agrochemicals and soil remediation. These microgels are prepared using octyl amine functionalized alginate which is crosslinked by 3, 3′-dithiopropionohydrazide crosslinker providing both hydrazone and disulfide bonds in microgels network. OAlgDP MGs are further loaded with hydrophobic diuron herbicide displaying ≈85 % encapsulation efficiency. Sustained release of diuron is obtained in 2 mM GSH (≈100 % after 380 h) and at pH 5 (≈72 % after 240 h). Furthermore, OAlgDP MGs are nontoxic up to 150 μg/mL against HEK293T cells while their reduced form is capable of capturing the heavy metal ions (Cu2+ and Hg2+) showing the potential of the developed system for moving toward sustainable agriculture.

Role of Alkylamines in Tuning the Morphology and Optical Properties of SnS2 Nanoparticles Synthesized by via Facile Thermal Decomposition Approach.

The present study reported the synthesis of SnS2 nanoparticles by using a thermal decomposition approach using tin chloride and thioacetamide in diphenyl ether at 200 °C over 60 min. SnS2 nanoparticles with novel morphologies were prepared by the use of different alkylamines (namely, octylamine (OCA), dodecylamine (DDA), and oleylamine (OLA)), and their role during the synthesis was explored in detail. The synthesized SnS2 nanostructures were characterized using an array of analytical techniques. The XRD results confirmed the formation of hexagonal SnS2, and the crystallite size varied from 6.1 nm to 19.0 nm and from 2.5 to 8.8 nm for (100) and (011) reflections, respectively. The functional group and thermal analysis confirmed the presence of organics on the surface of nanoparticles. The FE-SEM results revealed nanoparticles, nanoplates, and flakes assembled into flower-like morphologies when dodecylamine, octylamine, and oleylamine were used as capping agents, respectively. The analysis of optical properties showed the variation in the bandgap and the concentration of surface defects on the SnS2 nanoparticles. The role of alkylamine as a capping agent was explored and discussed in detail in this paper and the mechanism for the evolution of different morphologies of SnS2 nanoparticles was also proposed.

Role and effect of electrolytes selection on supercapacitance behaviour of aminated graphenes

In order to ascertain the role and effect of various electrolytes on the electrochemical performances, comprehensive electrochemical study using large varieties of organic and inorganic acids, alkalis and salts as electrolytes were carried out by employing aminated graphenes as electrode materials. The aminated graphenes have been synthesised through chemical functionalization of graphene oxide using long chain amines [octylamine (OA) and octadecylamine (ODA)] covalently bonded to graphene oxide and subsequent in-situ reduction produced more stable reduced aminated graphene oxides. The octylamine modified reduced graphene oxide (rGO–OA) produces promising galvanic charge discharge supercapacitance value of 678.7 F/g with energy density 455.99 Wh/kg and power density 107.99 W/kg in zinc chloride (ZnCl2) electrolyte. On the other hand, rGO–OA in oxalic acid electrolyte shows the charge discharge supercapacitance value of 336.08 F/g at 0.05 A/g current density and also produce energy density of 241.98 Wh/kg and moderate power density of 221.85 W/kg. Similar trends can be observed with octadecyl amine modified reduced graphene oxide (rGO–ODA) also. Thus, best capacitance values of 248 F/g and 110 F/g in ZnCl2 and oxalic acid electrolytes respectively were recorded for rGO–ODA. The alkali electrolytes do not produce significant results and are thus omitted from the main text. The EIS measurement using Nyquist and Bode plots were also divulging the better capacitive and charge transfer behaviour of rGO–OA in ZnCl2 and Oxalic acid electrolytes.

Ligand Coverage and Exciton Delocalization Control Chiral Imprinting in Perovskite Nanoplatelets

Chiral perovskites have recently generated significant interest, yet little is known about how their chiro-optical properties arise. In this study, chiral methylammonium lead halide perovskite nanoplatelets (NPLs) with varied halide and ligand compositions are prepared by using direct synthetic methods. Circular dichroism (CD) and 1H NMR studies find a nonlinear relationship between the chiroptical properties and the ratio of chiral phenylethylammonium (PEA) to achiral octylamine (OA) ligands on the NPL surface. We use density functional theory (DFT) computations and a chiral imprinted particle-in-a-box model to rationalize the experimentally observed CD spectra, and we find that the saturation of the induced chirality depends on the size of the perovskite exciton relative to the size of the ligand moleclues. Temperature-dependent CD and 1H NMR studies, combined with DFT analysis, show that both the CD intensity and sign depend strongly on the structure and orientation of the ligands. This work reveals the complex nature of chiral imprinting in perovskite nanostructures and establishes a simple physical model for ligand-induced chiral imprinting to guide the further development of chiral materials.

Alkyl chain length influence of hydrotrope on the pH responsiveness of surfactant aggregates based on dynamic imine bond

• Ionic hydrotropes with different chain length based on imine bond is prepared. • The pH responsiveness of solution by mixing CTAB and hydrotrope is explored. • The mechanism of different pH responsiveness of mixture is analyzed. The combination of pH-responsive hydrotropes and cationic surfactants is a novel way to construct pH-responsive surfactant aggregates. Herein, in order to investigate the chain length influence of hydrotrope on surfactant aggregate, three hydrotropes were formed from p-hydroxybenzaldehyde (HB) and added amine (hexylamine (HA), octylamine (OA), dodecylamine (DA)) respectively based on dynamic imine bonds. Then the surfactant aggregates were constructed by adding cetyltrimethyl ammonium bromide (CTAB). The molar ratio of CTAB: HB: HA/OA/DA was fixed at 100:55:55. The formation of imine bonds was proved by means of 1 H NMR measurement. Rheological measurements, and cryo -TEM were used to explore the pH responsiveness of the surfactant aggregates. The results showed that as pH increased from 6.0 to 12.0, the CTAB/HB/HA system changed from a low viscosity fluid to a viscoelastic fluid, as the CTAB/HB/OA system transformed from aqueous liquid via a transparent gel solution to a turbid fluid. On the other hand, the CTAB/HB/DA system can achieve four state transitions, from a non-viscosity fluid, via a viscoelastic fluid, turbid fluid and finally to a viscoelastic fluid. With the change of pH, the CTAB/HB/HA system turned from spherical to wormlike micelles, while CTAB/HB/OA experienced changes from spherical micelles via wormlike micelles to vesicles. Finally, the CTAB/HB/DA system was the most complex one, which converted from spherical micelles, wormlike micelles via vesicle, into final wormlike micelles. In conclusion, the sensitivity of pH responsiveness among these three systems gradually improved by increasing the chain length of the hydrotrope formed by HB and amine. This can be attributed to the different growth rates of the packing parameter. This work demonstrated the feasibility of constructing pH responsive surfactant aggregates by introducing hydrotropes to cationic surfactants.

One-Pot Synthesis of Amphiphilic Biopolymers from Oxidized Alginate and Self-Assembly as a Carrier for Sustained Release of Hydrophobic Drugs.

In this paper, we developed an organic solvent-free, eco-friendly, simple and efficient one-pot approach for the preparation of amphiphilic conjugates (Ugi-OSAOcT) by grafting octylamine (OCA) to oxidized sodium alginate (OSA). The optimum reaction parameters that were obtained based on the degree of substitution (DS) of Ugi-OSAOcT were a reaction time of 12 h, a reaction temperature of 25 °C and a molar ratio of 1:2.4:3:3.3 (OSA:OCA:HAc:TOSMIC), respectively. The chemical structure and composition were characterized by Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR), X-ray diffraction (XRD), thermogravimetry analyser (TGA), gel permeation chromatography (GPC) and elemental analysis (EA). It was found that the Ugi-OSAOcT conjugates with a CMC value in the range of 0.30–0.085 mg/mL could self-assemble into stable and spherical micelles with a particle size of 135.7 ± 2.4–196.5 ± 3.8 nm and negative surface potentials of −32.8 ± 0.4–−38.2 ± 0.8 mV. Furthermore, ibuprofen (IBU), which served as a model poorly water-soluble drug, was successfully incorporated into the Ugi-OSAOcT micelles by dialysis method. The drug loading capacity (%DL) and encapsulation efficiency (%EE) of the IBU-loaded Ugi-OSAOcT micelles (IBU/Ugi-OSAOcT = 3:10) reached as much as 10.9 ± 0.4–14.6 ± 0.3% and 40.8 ± 1.6–57.2 ± 1.3%, respectively. The in vitro release study demonstrated that the IBU-loaded micelles had a sustained and pH-responsive drug release behavior. In addition, the DS of the hydrophobic segment on an OSA backbone was demonstrated to have an important effect on IBU loading and drug release behavior. Finally, the in vitro cytotoxicity assay demonstrated that the Ugi-OSAOcT conjugates exhibited no significant cytotoxicity against RAW 264.7 cells up to 1000 µg/mL. Therefore, the amphiphilic Ugi-OSAOcT conjugates synthesized by the green method exhibited great potential to load hydrophobic drugs, acting as a promising nanocarrier capable of responding to pH for sustained release of hydrophobic drugs.

Reversible formation/disruption of dynamic double-tailed surfactants in a binary mixture: effects on interfacial properties and aggregation behavior

Dynamic covalent chemistry provides numerous possibilities to develop various amphiphiles. However, the design of responsive amphiphiles bearing tunable symmetry based on dynamic covalent bonds is still a challenge. Herein, a dynamic double-tailed surfactant (DDTS) was produced in situ by mixing aldehyde-type amphiphile (N-hexadecyl-N,N-dimethyl-N-(2-(4-formyl-phenoxy)ethyl) ammonium bromide, HOBAB) and commercial octylamine (OA) with a stoichiometric ratio of 1:1. After equilibrium (pH = 10.0), the composition were 68% DDTS, 16% HOBAB and 16% OA. The predominant surfactant in the solution can be reversibly tuned between highly asymmetrical HOBAB and approximately symmetrical DDTS by alternately adding acid (pH = 5.0) and base (pH = 10.0) due to the pH sensitivity of imine bonds. The presence of DDTS significantly decreased the critical micelle concentration, enhanced the adsorption efficiency at the interface and the effectiveness in surface tension reduction, and thermodynamically facilitated the formation of aggregates. More importantly, the emergence of DDTS triggered a transformation from spherical micelles to vesicles, because of the increase in symmetry of the amphiphiles. Once DDTS was disrupted upon decreasing the pH, the opposite transformation ensued. Such a transformation between micelles and vesicles could also be triggered by altering the choice of alkylamine. The present work provides an alternative way to control the transformation between micelles and vesicles, which is favorable for the design of new responsive soft colloids and exploration of their potential applications.

In situ preparation of two-dimensional ytterbium ions doped all-inorganic perovskite nanosheets for high-performance visual dual-bands photodetectors

Two-dimensional (2D) all-inorganic halide perovskites exhibit impressive optical and electrical properties, which are attracting extensive current interests. Rare earth (RE) ions doping is a significant method to adjust their optical, electrical properties and realize various applications. However, 2D RE ions-doped perovskite crystals have been rarely reported. Herein, we reported the synthesis of novel 2D all-inorganic perovskite CsPbClxBr3−x nanosheets (NSs) doped with RE ions. The octylamine (OLAm) with short carbon chains is used to tune the growth orientation for the preparation of 2D perovskite NSs. The morphology of the NSs can be adjusted by varying the ratio of shorter ligands to longer ligands and changing the temperature. The Yb3+ ions doped CsPbClBr2 NSs demonstrate an excitonic emission of perovskite host and a quantum cutting emission of Yb3+ ions at 985 nm with the optimal photoluminescence quantum yield (PLQY) of 128%. The results of femtosecond time-resolved transient absorption spectroscopy and DFT calculations indicate that the defect density of NSs is largely decreased and the photostability is enhanced induced by the passivation effect of Yb3+ ions. The photodetector (PD) based on lateral assembled Yb3+ ions doped CsPbClBr2 NS film is fabricated, which demonstrates a high responsivity and dual-band detection capability. The as-fabricated PDs are sensitive to both UV and NIR light, showing the responsivity of 1.96 A W−1, 0.12 mA W−1, the detectivity of 5 × 1012, 2.15 × 109 Jones at 440 nm and 980 nm, respectively. Finally, based on an imaging system with a PD array and a data analysis system, visual photoelectric detection is realized, and high-contrast images of the measured UV and NIR light are displayed. This work paves the way to tune the properties of 2D perovskite materials and develop high-performance optoelectronic devices.

Uranium extraction from nitrate media using amine functionalized poly acrylate hydrogel / nano silica

ABSTRACT Sorption of U (VI) onto novel nano material of amine functionalized poly acrylate hydrogel/nano silica was investigated. In the preparation, tri octyl amine, cyclohexane, poly acrylic acid oleic acid mixed with sodium meta silicate and tri ethanol amine to yield nano particles of amine functionalized poly acrylate hydrogel/nano silica. The capability of the newly adsorbent for uranium sorption was estimated using various controlling variables such as medium pH, uranium concentration, equilibrium time, reaction temperature and the interfering ions. The experimental results showed that, rather than chloride or sulfate, the proper loading capacity was achieved at uranyl nitrate species at pH 1 for 30 minutes stirring at 60°C. Where, the loading capacity was 372.52 mg/g. The pseudo-second-order mechanism fit the U (VI) adsorption kinetics on the sorbent material well, the mechanism of intra-particle diffusion governed the sorption process, and the adsorption equilibrium followed the Langmuir model. The thermodynamic parameters calculated ∆S°, ∆G°, and ∆H°, which indicate that U (VI) sorption process is thermodynamically advantageous, spontaneous, and endothermic. It is a promising and efficient nano adsorbent that could be used for upscaling design and application for U (VI) separation from acidified monazite leach liquor.