Matrix-assisted pulsed laser evaporation

MAPLE Matrix-Assisted Pulsed Laser Evaporation... 

MAPLE matrix assisted pulsed laser evaporation... 

Examples for the second group are polymers as fuel in the micro laser plasma thruster (JJ.LPT), PLD of polymers, matrix-assisted pulsed laser evaporation (MAPLE), which is a deposition technique that can be used to deposit highly uniform thin films [26], or laser-induced forward transfer (LIFT) [27-29], which can be used to produce microstructures by transferring an irradiated area of a target film to an acceptor substrate. The polymer can be the transferred material, or just functions as driving force in the transfer. 

Biomimetic nanocrystalline apatite coatings were deposited on titanium substrates by matrix-assisted pulsed laser evaporation (MAPLE), a technique with potential application in tissue engineering (Visan et al., 2014 Caricato etal., 2014). The targets were prepared from nano-sized, poorly crystalline apatite powders, analogous in composition to mineral bone. For the deposition of thin films, a KrF excimer laser source was used (A = 248 nm,rFWHM < 25 ns). Analyses of the deposited films showed that the structural and chemical nature of the nanocrystalline precursor apatite was preserved. Hence, MAPLE may be a suitable technique for the congruent transfer of a delicate material such as nanohydroxyapatite. 

Patz TM et al (2007) Matrix assisted pulsed laser evaporation of biomaterial thin films. Mater Sci Eng C 27 514-522... 

A. M. Taurino, R. Rella, J. Spadavecchia, M.G. Manera, S. Capone, M. Martino, A.P. Caricato, T. Tunno, Acetone and ethanol solid-state gas sensors based on Ti02 nanoparticles thin film deposited by matrix assisted pulsed laser evaporation , Sensors and Actuators B, 127, 426 31, (2007). 

Wu, P., et al. 2003. Laser transfta- of biomaterials matrix-assisted pulsed laser evaporation (MAPLE) and MAPLE direct write. Review of Scientific Instruments 74(4) 2546-2557. 

Dopamine, an important neurotransmitter molecule, was detected with metalloporphyrin—either Zn(II)-5,10,15,20-tetrakis(4-pyridyl)porphyrin or Co(n)-5,10,15,20-tetrakis(4-methoxyphenyl)-porphyrin—thin films on screen-printed carbon nanotube electrodes, prepared by matrix-assisted pulsed laser evaporation [235]. A few years later, an iron(III) [3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropanoato]/MWCNT composite was used to fabricate a modified glassy carbon electrode that was successfully used for the simultaneous determination of ascorbic acid, dopamine, nric acid, and nitrite ion [236]. 

Cristescu R, Popescu C, Popescu AC, Mihailescu IN, Ciucu AA, Andronie A, lordache S, Stamatin 1, Fagadar-Cosma E, Chrisey DB. Eunctional porphyrin thin films deposited by matrix assisted pulsed laser evaporation. Mater Sci Eng B 2010 169 106-10. 

Matrix-assisted pulsed laser evaporation (MAPLE) was used successfully to prepare thin films of a similar blend of PLGA with poly(ethylene glycol) (PEG), with... 

Miroiu, F., Socol, G., Visan, A., Stefan, N., Craciun, D., Craciun, V., Dorcioman, G., MihaUescu, I., Sima, L., Petrescu, S. Composite biocompatible hydroxyapatite-silk fibroin coatings for medical implants obtained by matrix assisted pulsed laser evaporation. Mater. Sci. Eng. B169(l), 151-158 (2010)... 

Matrix-assisted iaser desorption/ionization (MALDI). This is another ionization method for the analysis of large molecules such as peptides, proteins, and nucleic acids, as well as some synthetic polymers. In MALDI, the analyte is first cocrystallized with an excess of a matrix, e.g., sinapinic acid or dihydroxybenzoic acid, that has a constituent aromatic component able to absorb photons from a UV laser beam. When the dried analyte matrix mixture is exposed (inside the vacuum chamber) to a sudden input of energy from a laser pulse the matrix evaporates, essentially instantaneously, carrying with it the analyte molecules. The matrix forms reagent ions that protonate the analytes. The selection of the matrix is critical as different compound classes exhibit substantial, matrix-dependent differences in ionization efficiency. The MALDI matrix should not be confused with the alternative use of the term matrix that is used to denote the medium in which biological and/or environmental components are presented, e.g., blood plasma, urine, sediment. 

Laser Desorption/Ablation Ionization Methods. Matrix-assisted laser desoiption ionization (MALDI) relies on the use of a solid chromophQric matrix, chosen to absorb laser light, which is co-mixed with the analyte (4). Typically, a solution of a few picomoles of analyte is mixed widi a lOO-to-5000 fold excess of the matrix in solution. A few microliters of the resulting solution are deposited on a mass spectrometer solids probe, and the solvent is allowed to evaporate before inserting the probe into the mass spectrometer. When the pulsed laser beam strikes the sample surface in the spectrometer, the sample molecules are desorbedAonized at high efficiency. The various mechanisms for matrix and non-matrix assisted laser desorption have been discussed (5,6). 

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