Texturing studies on bulk crystals

Prabhakaran, D.; Subramanian, C.

doi:10.1088/0953-2048/11/8/013

Cited by 6 publications

(3 citation statements)

References 23 publications

(17 reference statements)

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“…However, the nanosensors 1 – 4 with highly physical properties (see Figure B, inset data) could be used as efficient preconcentrators for simultaneously visual inspection “naked eye” and simple detection of Pb(II) ions over a wide, adjustable range of 5.0–150 ppb . The color transition corresponding to the formation of the [Pb-DTAR] n + complex (Scheme b) provided a simple procedure for sensitive and selective detections of Pb(II) ions by the naked eye without the need for sophisticated instruments (Figure , inset). – , The color intensity and homogeneity increased with increasing Pb(II) ion concentration. The quantification process of nanosensors 1 – 4 for Pb(II) ion sensing over a wide range of concentration was monitored by UV/vis spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

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Three-Dimensional Wormhole and Ordered Mesostructures and Their Applicability as Optically Ion-Sensitive Probe Templates

et al. 2008

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Large-scale cubic Pm3n silica monoliths (HOM) were fabricated in wormhole and ordered mesostructures and in shape- and size-controlled cage pores by using a simple and fast strategy. The functional use of these 3D HOM monoliths as probe anchoring templates enabled the efficient designs of optical nanosensors. In this regard, the synthesized chromoionophore was physisorbed into the 3D HOM pore surface carriers without potential leaching. Results revealed that the structural features of the HOM monoliths such as ordered and worm-like cage pores substantially influenced the ion-sensing functionality in terms of their probe inclusion capacities, ion-transport diffusion, optical responsive profile, and visual color transition series during the detection of ultratraces of toxic Pb(II) ions. The nanosensors were selective in discriminating trace Pb(II) ions over multicomponent matrix species, with reliable and reproducible detection and quantification limits. A comparative study on the ion-sensing efficiency of the chromoionophore in both solution and solid phases indicated that the solid HOM monoliths show promise as probe templates to design-made nanosensors for the detection of ultratraces Pb(II) ions. Considering the environmental factors, nanosensors were solvent-free systems and had the capacity to serve as ion preconcentrators with complete reversibility and reusability. The significant features of the probe-design nanosensors led to overcoming the disposal problems, which were normally associated with the liquid probe systems.

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Section: Resultsmentioning

confidence: 99%

“…These methods often combine specificity and sensitivity but are hardly in the class of routine methods available for the control laboratory usage or for the on-site field analysis. Also, these sophisticated methodologies often require some form of sample cleanup procedures to alleviate sample matrix interferences …”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Wormhole and Ordered Mesostructures and Their Applicability as Optically Ion-Sensitive Probe Templates

et al. 2008

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“…[41,[45][46][47][48][49] Such modified resins were found to be highly useful and advantageous in terms of their versatility to chemical modification, wide range of pH working ability, and greater chemical and mechanical stability. The literature describes many chelating ionexchangers that were synthesized from XAD-2, [24,50,51] XAD-4, [44,49,[52][53][54] XAD-7, [39,55] XAD-16, [40,[56][57][58][59] and XAD-1180 [41,60] copolymers that are suitable for metal ion separation and preconcentration from aqueous solution. The Amberlite XAD-4 resin also possesses superior physical properties such as porosity (≥ 0.50 mL/mL), uniform distribution of pore size (0.49 -0.69 mm), high surface area (≥ 750 m 2 /g) and durability towards acids, bases, and oxidizing and reducing agents.…”

Section: Introductionmentioning

confidence: 99%

Solid Phase Extraction of Copper , Cadmium and Lead Using Amberlite XAD-4 Resin Functionalized with 2-Hydroxybenzaldehyde Thiosemicarbazone and its Application on Green Tea Leaves

Chowdhury¹,

Hoque²,

Fardous³

2013

JJC

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A new chelating resin, 2-hydroxybenzaldehyde thiosemicarbazone loaded XAD-4, was synthesized and characterized by FT-IR and elemental analyses. The synthesized resin was used for solid phase extraction (SPE) and preconcentration of Cu 2+ , Cd 2+ , and Pb 2+ from aqueous solution, where the metal ions were subsequently determined by graphite furnace atomic absorption spectrometry (GF-AAS). The optimum pH for preconcentration and separation of these metal ions was found to be 6.00. Optimum flow rate for quantitative sorption of the metal ions on functionalized resin was found to be 1 mL/min whereas 2 M nitric acid was selected as the eluent for quantitative release of the three metal ions from the resin column. The maximum adsorption capacity of the functionalized resin was found to be 3.5, 6.1, and 11.26 mg/g for Cu 2+ , Cd 2+ , and Pb 2+ , respectively. The detection limits for these metal ions are 0.87, 0.95, and 1.09 µg/L, respectively and limits of quantification are 1.12, 1.29, and 1.16 µg/L, respectively. The sorption half time (t 1/2) was found to be 6 min for Cu 2+ and Cd 2+ and 8 min for Pb 2+. Tolerance limits for various foreign electrolytes have also been investigated. A high preconcentration factor (~100) and low relative standard deviation ≤ 5% (n=3) values were obtained. Under optimum conditions, recovery of all metal ions was found to be nearly quantitative. The validation of the procedure was carried out by analysis of certified reference materials. The functionalized resin is highly stable and can be reused more than 100 times. The newly developed method was applied to the separation, preconcentration and determination of Cu 2+ , Cd 2+ , and Pb 2+ in tea leaves collected from the tea gardens of Moulovibazar district in Bangladesh.

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Micro-Pulling-Down (μ-PD) and Related Growth Methods

Chani

Shaped Crystals

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Texturing studies on bulk crystals

Cited by 6 publications

References 23 publications

Three-Dimensional Wormhole and Ordered Mesostructures and Their Applicability as Optically Ion-Sensitive Probe Templates

Three-Dimensional Wormhole and Ordered Mesostructures and Their Applicability as Optically Ion-Sensitive Probe Templates

Solid Phase Extraction of Copper , Cadmium and Lead Using Amberlite XAD-4 Resin Functionalized with 2-Hydroxybenzaldehyde Thiosemicarbazone and its Application on Green Tea Leaves

Micro-Pulling-Down (μ-PD) and Related Growth Methods

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