Laser beams resonant interaction with micro-droplets which have a controlled content

Pascu, Mihail-Lucian; Andrei, Ionuț Relu; Ferrari, Michele; Staicu, Angela; Smarandache, Adriana; Mahamoud, A.; Nastasa, Viorel; Liggieri, Libero

doi:10.1016/j.colsurfa.2010.02.036

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…Fig. 8 In general, irradiation produces more wetting agents able to let the substance better distribute along the fibers with some differences between cotton and polyester according to the more hydrophobic or hydrophilic percentage of surface active agents in the solution after irradiation [42]. For PZ the irradiation didn't appear to change appreciably wetting properties and distribution among the fibers.…”

Section: Figmentioning

confidence: 95%

Toxicity study in blood and tumor cells of laser produced medicines for application in fabrics

Morán

Tozar

Simon

et al. 2016

Colloids and Surfaces B: Biointerfaces

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Phenothiazine derivatives are non-antibiotics with antimicrobial, fungistatic and fungicidal effects. We exposed to a high energy UV laser beam phenothiazines solutions in water at 20mg/mL concentration to increase antibacterial activity of resulting mixtures. Compared to previous results obtained on bacteria, more research is needed about UV laser irradiated phenothiazines applications on cancer cell cultures to evidence possible anticancerous properties. Evaluation of the safety of the newly obtained photoproducts in view of use on humans is also needed. Due to expensive animal testing in toxicology and pressure from general public and governments to develop alternatives to in vivo testing, in vitro cell-based models are attractive for preliminary testing of new materials. Cytotoxicity screening reported here shows that laser irradiated (4h exposure time length) chlorpromazine and promazine are more efficient against some cell cultures. Interaction of laser irradiated phenothiazines with fabrics show that promethazine and chlorpromazine have improved wetting properties. Correlation of these two groups of properties shows that chlorpromazine appears to be more recommended for applications on tissues using fabrics as transport vectors. The reported results concern stability study of phenothiazines water solutions to know the time limits within which they are stable and may be used.

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Section: Figmentioning

confidence: 95%

Toxicity study in blood and tumor cells of laser produced medicines for application in fabrics

Morán

Tozar

Simon

et al. 2016

Colloids and Surfaces B: Biointerfaces

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“…A correlation between the non-resonant and resonant effects on a droplet at interaction with one single laser pulse was made in function of the laser beam power and the laser dye concentration. Further investigations [9] have concerned the interfacial and wetting properties after laser irradiation of the micro-droplets containing cytostatics and Doxorubicin, in order to assess their compatibility with microfluidic devices. These studies open new perspectives for using optofluidics methods for applications in nanomedicine and nanotechnologies.…”

Section: Laser Beam Non-resonant and Resonant Interaction With Singlementioning

confidence: 99%

“…Some concepts of new inhalation powders acting as carriers of pulmonary medicines were tested and, finally, special functional carrier particles have been designed and obtained by a spray drying technique [95]. Another smart medical application is described in [96], where modifications of medicines with laser beams in bulk and droplets is suggested in order to identify new ways for fighting multiple drug resistance acquired by bacteria. It is a promising alternative to modify existing medicines by exposing them to laser radiation and to obtain photoreaction products which may have bactericide effects.…”

Section: Microgels Hydrogels and Other Carrier Materialsmentioning

confidence: 99%

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Dutschk

Karapantsios

Liggieri

et al. 2014

Advances in Colloid and Interface Science

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Interfaces can be called Smart and Green (S&G) when tailored such that the required technologies can be implemented with high efficiency, adaptability and selectivity. At the same time they have also to be eco-friendly, i.e. products must be biodegradable, reusable or simply more durable. Bubble and drop interfaces are in many of these smart technologies the fundamental entities and help develop smart products of the everyday life.Significant improvements of these processes and products can be achieved by implementing and manipulating specific properties of these interfaces in a simple and smart way, in order to accomplish specific tasks. The severe environmental issues require in addition attributing ecofriendly features to these interfaces, by incorporating innovative , or, sometime, recycle materials and conceiving new production processes which minimize the use of natural resources and energy. Such concept can be extended to include important societal challenges related to support a sustainable development and a healthy population.The achievement of such ambitious targets requires the technology research to be supported by a robust development of theoretical and experimental tools, needed to understand in more details the behavior of complex interfaces. A wide but not exhaustive review of recent work concerned with green and smart interfaces is presented, addressing different scientific and technological fields. The presented approaches reveal a huge potential in relation to various technological fields, such as nanotechnologies, biotechnologies, medical diagnostics, new or improved materials.

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“…Literature reports show results about the laser beam interaction with droplets that contain single liquids or mixtures of immiscible materials produced in different surrounding environments (which may be either liquids or air/gases) [4,5].…”

Section: Introductionmentioning

confidence: 99%

Unresonant interaction of laser beams with microdroplets

Pascu¹,

Popescu²,

Ticoş³

et al. 2012

J. Eur. Opt. Soc.-Rapid Publ.

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The interaction of distilled water droplets (volumes of 3-4 µl) with pulsed laser beams emitted at 532 nm is described. At 532 nm the distilled water absorption is very low and the interaction of a water droplet with the laser radiation is dominated by unresonant phenomena. In this case, following the collision of the laser beam with a droplet in suspended position in air, its deformations and mechanical vibrations are produced. The conditions in which the droplets lose material as a consequence of the impact with laser beams are explored. The effects produced on the droplet were studied pulse by pulse and depend on: droplet's content, beam wavelength, power and focusing, irradiation geometry and adhesion of the droplet to the capillary on which it is suspended. The laser pulses energies were varied in four steps: 0.25 mJ, 0.4 mJ, 0.7 mJ and 1 mJ. The laser pulse full time width at half maximum was 5ns and the typical beam waist diameter on the droplet was 90 µm; the beam had a relatively low divergence around the focus point. The droplet's shapes evolution is visualised by recordings performed at 10 kframes/second. Following a droplet interaction with the laser beam one may also produce at a controlled moment in time, nanodroplets propagating at high (probably supersonic) speeds and microdroplets propagating at slower speeds. One may also produce suspended droplets of smaller dimensions than the initial one as well as micro/nano gas bubbles in the suspended droplet's material/volume. In a second set of experiments the behaviour of the microdroplets of Rhodamine 6G in distilled water was recorded at high speed, at resonant interaction with similar laser pulses, and at the same power levels. The phenomena considering that the droplets contents are Newtonian liquids produced at interaction with the laser beams, are discussed.

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Laser beams resonant interaction with micro-droplets which have a controlled content

Cited by 10 publications

References 11 publications

Toxicity study in blood and tumor cells of laser produced medicines for application in fabrics

Toxicity study in blood and tumor cells of laser produced medicines for application in fabrics

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Unresonant interaction of laser beams with microdroplets

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