Natural zeolite for adsorbing and release of functional materials

Hovhannisyan, Vladimir A.; Chen, Dong; Lai, Feng‐Jie; Chang, Nan Shan; Chen, Shean Jen

doi:10.1117/1.jbo.23.9.091411

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…The same findings were noted where cubic shape along with some aggregation of zeolite particles was reported [24]. Same shapes and properties of zeolite 4A particles were reported in the literature [25].…”

Section: Resultssupporting

confidence: 84%

Performance optimization of polyetherimide‐zeolite 4A mixed matrix membranes for carbon dioxide/methane separation process using response surface methodology

Masor,

Nasir,

Mannan

et al. 2023

Materialwissenschaft Werkst

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The performance optimization studies of zeolite 4A embedded polyetherimide mixed matrix membranes to separate carbon dioxide/methane by simultaneously considering the effect of process parameters on process responses were the focus of this study. Mixed matrix membranes were characterized and analyzed. The thermophysical characteristics of the synthesized membranes were assessed by different analytical equipment. The permeability of pure gases was determined at varying feed pressures (4 bar to 10 bar) to evaluate gas separation performance. Process optimization studies were accomplished by response surface methodology to find the relation of pressure and zeolite loading on carbon dioxide and methane permeability, and carbon dioxide/methane selectivity. The characterization results revealed that all membranes were dense in structure and has improved thermal stability. The spectrometry results confirmed the molecular interaction between polyetherimide and zeolite 4A filler. Gas permeability results showed a more than 90 % increase in carbon dioxide permeability compared to the nascent polyetherimide membrane. Similarly, selectivity of mixed matrix membranes was 45 % higher than polyetherimide membrane. The optimal operating conditions were found to be 20 wt. % zeolite loading and 6 bar pressure with overall desirability of 0.700. These membranes can find potential in various gas separation applications.

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Section: Resultssupporting

confidence: 84%

Performance optimization of polyetherimide‐zeolite 4A mixed matrix membranes for carbon dioxide/methane separation process using response surface methodology

Masor,

Nasir,

Mannan

et al. 2023

Materialwissenschaft Werkst

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“…The experiments were carried out by a similar method that was used to measure rates of HYP release from clinoptilolite zeolite in ethanol–water or in aqueous solutions of collagen, human hemoglobin, and other biomolecules 35 . Briefly, 5 mg of dry MCZ nanoparticles were added to 4 mL of 5 μM HYP solution in 50% ethanol–water and stirred.…”

Section: Methodsmentioning

confidence: 99%

“…For multiphoton microscopy, we used a system based on a laser scanning microscope LSM 510 META (Carl Zeiss, Jena, Germany) coupled to the Ti:Sapphire fs Tsunami laser 35 . Second harmonic generation imaging was performed using a Fluar water immersion 40×/1.2 NA, WD = 0.28 mm objective (Carl Zeiss, Germany) and the laser radiation with the following parameters: wavelength—780 nm, pulse width—120 fs, repetition rate—80 MHz, pulse energy—0.2 nJ.…”

Section: Methodsmentioning

confidence: 99%

Development of multifunctional nanocomposites for controlled drug delivery and hyperthermia

Hovhannisyan

Šipošová

Musatov

et al. 2021

Sci Rep

Self Cite

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Magnetic nano/micro-particles based on clinoptilolite-type of natural zeolite (CZ) were fabricated and were expected to act as carriers for controlled drug delivery/release, imaging and local heating in biological systems. Adsorption of rhodamine B, sulfonated aluminum phthalocyanine and hypericin by magnetic CZ nano/micro-particles was investigated, as was the release of hypericin. Using an alternating magnetic field, local temperature increase by 10 °C in animal tissue with injected magnetic CZ particles was demonstrated. In addition, the CZ-based particles have been found to exhibit an anti-amyloidogenic effect on the amyloid aggregation of insulin and lysozyme in a dose- and temperature-dependent manner. Therefore, the mesoporous structure of CZ particles provided a unique platform for preparation of multifunctional magnetic and optical probes suitable for optical imaging, MRI, thermo- and phototherapy and as effective containers for controlled drug delivery. We concluded that magnetic CZ nano/micro-particles could be evaluated for further application in cancer hyperthermia therapy and as anti-amyloidogenic agents.

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“…Natural zeolites represent an interesting class of multifunctional materials, and a number of potentially useful physical and chemical characteristics of these mineral substances have been industrially exploited [8][9][10][11][12][13][14]. Usually, natural zeolites have a quite low Si/Al atomic ratio, and for such a reason they are named "aluminous zeolites", in contrast with the "high-siliceous zeolites" that are mainly originated by synthesis.…”

Section: Introductionmentioning

confidence: 99%

Electrical Method for In Vivo Testing of Exhalation Sensors Based on Natural Clinoptilolite

Carotenuto

Nicolais

2022

Coatings

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Natural substances with a complex chemical structure can be advantageously used for functional applications. Such functional materials can be found both in the mineral and biological worlds. Owing to the presence of ionic charge carriers (i.e., extra-framework cations) in their crystal lattice, whose mobility is strictly depending on parameters of the external environment (e.g., temperature, humidity, presence of small gaseous polar molecules, etc.), zeolites can be industrially exploited as a novel functional material class with great potentialities in sensors and electric/electronic field. For fast-responding chemical-sensing applications, ionic transport at the zeolite surface is much more useful than bulk-transport, since molecular transport in the channel network takes place by a very slow diffusion mechanism. The environmental dependence of electrical conductivity of common natural zeolites characterized by an aluminous nature (e.g., chabasite, clinoptilolite, etc.) can be conveniently exploited to fabricate impedimetric water-vapor sensors for apnea syndrome monitoring. The high mechanical, thermal, and chemical stability of geomorphic clinoptilolite (the most widely spread natural zeolite type) makes this type of zeolite the most adequate mineral substance to fabricate self-supporting impedimetric water-vapor sensors. In the development of devices for medical monitoring (e.g., apnea-syndrome monitors), it is very important to combine these inexpensive nature-made sensors with a low-weight simplified electronic circuitry that can be easily integrated in wearable items (e.g., garments, wristwatch, etc.). Very low power square-wave voltage sources (micro-Watt voltage sources) show significant voltage drops under only a minimal electric load, and this property of the ac generator can be advantageously exploited for detecting the small impedimetric change observed in clinoptilolite sensors during their exposition to water vapor coming from the human respiratory exhalation. Owing to the ionic conduction mechanism (single-charge carrier) characterizing the zeolite slab surface, the sensor biasing by an ac signal is strictly required. Cheap handheld multimeters frequently include a very low power square-wave (or sinusoidal) voltage source of different frequency (typically 50 Hz or 1 kHz) that is used as a signal injector (signal tracer) to test audio amplifiers (low-frequency amplifies), tone control (equalizer), radios, etc. Such multimeter outputs can be connected in parallel with a true-RMS (Root-Mean-Square) ac voltmeter to detect the response of the clinoptilolite-based impedimetric sensors as voltage drop. The frequency of exhalation during breathing can be measured, and the exhalation behavior can be visualized, too, by using the voltmeter readings. Many handheld multimeters also include a data-logging possibility, which is extremely useful to record the voltage reading over time, thus giving a time-resolved voltage measurement that contains all information concerning the breathing test. Based on the same principle (i.e., voltage drop under minimal resistive load) a devoted electronic circuitry can also be made.

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Natural zeolite for adsorbing and release of functional materials

Cited by 16 publications

References 33 publications

Performance optimization of polyetherimide‐zeolite 4A mixed matrix membranes for carbon dioxide/methane separation process using response surface methodology

Performance optimization of polyetherimide‐zeolite 4A mixed matrix membranes for carbon dioxide/methane separation process using response surface methodology

Development of multifunctional nanocomposites for controlled drug delivery and hyperthermia

Electrical Method for In Vivo Testing of Exhalation Sensors Based on Natural Clinoptilolite

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