scholarly journals Laser cleaning of paintings: in situ optimization of operative parameters through non-invasive assessment by optical coherence tomography (OCT), reflection FT-IR spectroscopy and laser induced fluorescence spectroscopy (LIF)

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Patrizia Moretti ◽  
Magdalena Iwanicka ◽  
Kristalia Melessanaki ◽  
Evdoxia Dimitroulaki ◽  
Olga Kokkinaki ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Ir Spectroscopy ◽  
Fluorescence Spectroscopy ◽  
Laser Induced Fluorescence ◽  
Laser Cleaning ◽  
Optical Coherence ◽  
Non Invasive ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Fluorescence and IR studies on the hydration state of lanthanides(III) and curium(III) in the complexes extracted with purified Cyanex301, Cyanex302 and Cyanex272

2004 ◽  
Vol 92 (8) ◽  
Author(s):  
Guoxin Tian ◽  
Takaumi Kimura ◽  
Zenko Yoshida ◽  
Yongjun Zhu ◽  
Linfeng Rao
Keyword(s):  
Ir Spectroscopy ◽  
Fluorescence Spectroscopy ◽  
Hydration Number ◽  
Laser Induced Fluorescence ◽  
Time Resolved ◽  
Ir Studies ◽  
Hydration State ◽  
Ft Ir ◽  
Insight Into ◽  
Ft Ir Spectroscopy

SummaryThe hydration number of lanthanides, Ln(III) (Ln = Sm, Eu, Tb, Dy), and Cm(III) in the extracted complexes with purified Cyanex301, Cyanex302 and Cyanex272 was investigated using time-resolved laser-induced fluorescence spectroscopy (TRLFS) and FT-IR spectroscopy. The results, in conjunction with the previous results on the Ln(III) and Am(III) complexes, provide insight into the composition of the extracted complexes. No difference has been observed in the hydration number or the composition between the Ln(III) and Cm(III) complexes with Cyanex302 or Cyanex272. The extracted complexes of Ln(III) and Cm(III) with Cyanex302 have the formula, ML(HL

scholarly journals Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

2019 ◽  
Author(s):  
Xi Yang
Keyword(s):  
Ir Spectroscopy ◽  
Reaction Rate ◽  
Interfacial Polymerization ◽  
Reaction System ◽  
Reaction Rates ◽  
Water Permeation ◽  
Ft Ir ◽  
Trimesoyl Chloride ◽  
Ft Ir Spectroscopy

The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize the nanofiltration (NF) membrane. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies are applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer; (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in-situ FT-IR spectroscopy was firstly used to monitor the IP reaction of PIP/TMC reaction system, with hydrophilic interlayers or macromolecular additives. Moreover, we study the formed polyamide layer growth on the substrate, in a real-time manner. The in-situ FT-IR experimental results confirm that the IP reaction rates are effectively suppressed and the formed polyamide thickness reduces from 138±24 nm to 46±2 nm. Furthermore, the optimized NF membrane with excellent performance are consequently obtained, which include the boosted water permeation flux about 141~238 (L·m2·h/MPa) and superior salt rejection of Na2SO4 > 98.4%.

Ethylene polymerization on a SiH4-modified Phillips catalyst: detection of in situ produced α-olefins by operando FT-IR spectroscopy

2012 ◽  
Vol 14 (7) ◽  
pp. 2239 ◽  
Author(s):  
Caterina Barzan ◽  
Elena Groppo ◽  
Elsje Alessandra Quadrelli ◽  
Vincent Monteil ◽  
Silvia Bordiga
Keyword(s):  
Ir Spectroscopy ◽  
Ethylene Polymerization ◽  
Phillips Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Recent trends in the application of Fourier Transform Infrared (FT-IR) spectroscopy in Heritage Science: from micro- to non-invasive FT-IR

2019 ◽  
Vol 4 (11) ◽  
Author(s):  
F. Rosi ◽  
L. Cartechini ◽  
D. Sali ◽  
C. Miliani
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Properties ◽  
Non Invasive ◽  
High Lateral Resolution ◽  
Heritage Science ◽  
Macro Scale ◽  
Archaeological Materials ◽  
Molecular Specificity ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Abstract The relevance of FT-IR spectroscopy in heritage science has experienced a constant grow in the last two decades owing to analytical peculiarities that make it an extremely useful tool to answer the questions posed by the study and conservation of art-historical and archaeological materials. High versatility, sensitivity and molecular specificity are, in fact, all requirements that FT-IR spectroscopy fulfils allowing for the investigation of the chemical properties of heritage materials spanning from the micro- to the macro-scale and offering a variety of approaches to minimize sample manipulation and maximize extracted information. Molecular identification and localisation at high lateral resolution of organic and inorganic components in micro-samples was, over recently, the mostly exploited use of FT-IR in heritage science; however, benefiting from technological progress and advances in optical materials and components achieved in the last decade, it now stands out also for non-invasive surface analysis of artworks by fully portable instrumentation.

High-Precision Continuous-Wave Terahertz Spectroscopy Based on a Photomixing Technique for Identifying Pearls

2019 ◽  
Vol 73 (12) ◽  
pp. 1388-1393
Author(s):  
Chihoon Kim ◽  
Taeksoo Ji
Keyword(s):  
Optical Coherence Tomography ◽  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Continuous Wave ◽  
Terahertz Spectroscopy ◽  
Thz Spectroscopy ◽  
Ft Ir ◽  
Thz Absorption ◽  
Ft Ir Spectroscopy ◽  
Cultured Pearls

We present the accurate terahertz spectra of between imitation and cultured pearls using continuous-wave terahertz (CW-THz) spectroscopy. Using Fourier transform infrared (FT-IR) spectroscopy and optical coherence tomography (OCT) measurements, cultured pearls can be distinguished from imitation pearls by observing distinct absorption peaks and discriminative boundaries. The THz absorption spectra up to 0.3 THz obtained from CW-THz spectroscopy show several absorption peaks at specific frequencies with the cultured pearls but no peaks with the imitation pearls, which results from the existence of the nacre polymorph of cultured pearls. Hence, it is expected that the CW-THz system proposed herein will be applicable to fast, nondestructive spectrum analysis including pearl identification.

Non-invasive reflection FT-IR spectroscopy for on-site detection of cleaning system residues on polychrome surfaces

2020 ◽  
Vol 157 ◽  
pp. 105033
Author(s):  
Patrizia Moretti ◽  
Francesca Rosi ◽  
Costanza Miliani ◽  
Melissa Daugherty ◽  
Klaas Jan van den Berg ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Non Invasive ◽  
Cleaning System ◽  
Ft Ir ◽  
Ft Ir Spectroscopy
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