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Song DH, Huh C, Seo HS. Spectrally combined four-diode-pumped femtosecond Ti:sapphire laser with 16.3 nJ pulse and its application to video-rate coherent anti-Stokes Raman scattering spectro-microscopy. OPTICS EXPRESS 2023; 31:3269-3277. [PMID: 36785323 DOI: 10.1364/oe.481422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 12/29/2022] [Indexed: 06/18/2023]
Abstract
We demonstrate the generation of high-energy femtosecond pulses by a spectrally combined four-diode-pumped Ti:sapphire laser with semi-conductor saturable absorber mirror mode locking. To achieve energy scaling, the laser cavity was extended using a design based on the Herriott multipass cell. The laser operates at a 17.5 MHz repetition rate and generates pulses with energies as high as 16.3 nJ and 80 fs in duration. The signal-to-noise ratio at the fundamental frequency showed an extinction ratio of >50 dB relative to the carrier. This compact single laser was applied to video-rate forward and backward coherent anti-Stokes Raman scattering spectro-microscopy with a pixel dwell time of 122 ns, which is the lowest dwell time ever achieved, to the best of our knowledge.
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Shama VM, Swami AR, Aniruddha R, Sreedhar I, Reddy BM. Process and engineering aspects of carbon capture by ionic liquids. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101507] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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3
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Guo S, Liu N, Ding W, Pang X, Ding Z, Chen Y. Graphene oxide modified waterborne polyurethane‐based dye with high color‐fastness performance. J Appl Polym Sci 2021. [DOI: 10.1002/app.50390] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Song Guo
- China Leather and Footwear Research Institute Co. Ltd Beijing China
| | - Na Liu
- China Leather and Footwear Research Institute Co. Ltd Beijing China
| | - Wei Ding
- China Leather and Footwear Research Institute Co. Ltd Beijing China
| | - Xiaoyan Pang
- China Leather and Footwear Research Institute Co. Ltd Beijing China
| | - Zhiwen Ding
- China Leather and Footwear Research Institute Co. Ltd Beijing China
| | - Yongfang Chen
- China Leather and Footwear Research Institute Co. Ltd Beijing China
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Synthesis, conformational studies, vibrational spectra and thermal properties, of new 1,4-(phenylenebis(methylene) bis(methyl-imidazolium) ionic liquids. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128731] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Zhao Y, Guo T, Yang J, Li Y, Yuan X, Zhao Y, Ren L. Alcohols responsive photonic crystals prepared by self-assembly of dendronized block copolymers. REACT FUNCT POLYM 2019. [DOI: 10.1016/j.reactfunctpolym.2019.04.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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6
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Panja SK, Haddad B, Debdab M, Kiefer J, Chaker Y, Bresson S, Paolone A. Cluster Formation through Hydrogen Bond Bridges across Chloride Anions in a Hydroxyl-Functionalized Ionic Liquid. Chemphyschem 2019; 20:936-940. [PMID: 30821876 DOI: 10.1002/cphc.201801206] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 03/01/2019] [Indexed: 11/10/2022]
Abstract
Several recent studies of hydroxyl-functionalized ionic liquids (ILs) have shown that cation-cation interactions can be dominating these materials at the molecular level when the anion involved is weakly interacting. The hydrogen bonds between the like ions led to the formation of interesting chain-like, ring-like, or distinct dimeric (i. e. two ion pairs) supermolecular clusters. In the present work, vibrational spectroscopy (ATR-IR and Raman) and density functional theory (DFT) calculations of the hydroxyl-functionalized imidazolium ionic liquid C2 OHmimCl indicate that anion-cation hydrogen bonding interactions are dominating, leading to the formation of distinct dimeric ion pair clusters. In this arrangement, the Cl- anions function as a bridge between the cations by establishing bifurcated hydrogen bonds with the OH group of one cation and the C(2)-H of another cation. Cation-cation interactions, on the other hand, do not play a significant role in the observed clusters.
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Affiliation(s)
- Sumit Kumar Panja
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, Karnataka, India
| | - Boumediene Haddad
- Department of Chemistry, Dr Moulay Tahar University of Saida, Algeria
| | - Mansour Debdab
- Laboratoire de Synthèse et Catalyse Tiaret LSCT, University of Tiaret, Algeria
| | - Johannes Kiefer
- Technische Thermodynamik, Universität Bremen, Badgasteiner Str. 1, 28359, Bremen, Germany
| | - Yassine Chaker
- Laboratoire de Synthèse et Catalyse Tiaret LSCT, University of Tiaret, Algeria
| | - Serge Bresson
- Laboratoire de Physique des Systèmes Complexes, Université Picardie Jules Verne, 33 rue St Leu, 80039, Amiens cedex, France
| | - Annalisa Paolone
- Consiglio Nazionale delle Ricerche Instituto dei Sistemi Complessi (CNR-ISC), University of Rome La Sapienza, Piazzale A. Moro 5, 00185, Roma, Italy
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Rullich CC, Kiefer J. Principal component analysis to enhance enantioselective Raman spectroscopy. Analyst 2019; 144:2080-2086. [PMID: 30734784 DOI: 10.1039/c8an01886c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Enantioselective Raman (esR) spectroscopy is an innovative technique with a high potential for online process monitoring in chiral media, e.g. in the pharmaceutical industry. A prerequisite for an effective application is to combine the experimental approach with suitable concepts for data analysis. In this work, we present a chemometric approach to analyze the esR spectra recorded in an automatized polarization-resolved Raman set-up. It is demonstrated that the proposed method is capable of distinguishing between the enantiomers of the chiral alcohol 4-methylpentan-2-ol in a fully unsupervised fashion. Furthermore, it is shown that the difficulty of facing only small intensity differences between the esR spectra of the enantiomers can be overcome by feeding difference spectra between the pure enantiomers and the racemate into the principal component analysis (PCA) algorithm. The enantiomers are clearly discriminable along the first principal component.
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Affiliation(s)
- Claudia C Rullich
- Technische Thermodynamik, Universität Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
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Azimi Dijvejin Z, Ghaffarkhah A, Sadeghnejad S, Vafaie Sefti M. Effect of silica nanoparticle size on the mechanical strength and wellbore plugging performance of SPAM/chromium (III) acetate nanocomposite gels. Polym J 2019. [DOI: 10.1038/s41428-019-0178-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Stodt MFB, Gonchikzhapov M, Kasper T, Fritsching U, Kiefer J. Chemistry of iron nitrate-based precursor solutions for spray-flame synthesis. Phys Chem Chem Phys 2019; 21:24793-24801. [DOI: 10.1039/c9cp05007h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the chemistry of precursor solutions for spray-flame synthesis is a key step to developing inexpensive and large scale applications for tailored nanoparticles.
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Affiliation(s)
- Malte F. B. Stodt
- Technische Thermodynamik
- Universität Bremen
- 28359 Bremen
- Germany
- Leibniz Institute for Materials Engineering IWT
| | - Munko Gonchikzhapov
- Mass Spectrometry in Reactive Flows, IVG
- University of Duisburg-Essen
- D-47048 Duisburg
- Germany
| | - Tina Kasper
- Mass Spectrometry in Reactive Flows, IVG
- University of Duisburg-Essen
- D-47048 Duisburg
- Germany
| | - Udo Fritsching
- Leibniz Institute for Materials Engineering IWT
- 28359 Bremen
- Germany
- Department of Process and Chemical Engineering
- Universität Bremen
| | - Johannes Kiefer
- Technische Thermodynamik
- Universität Bremen
- 28359 Bremen
- Germany
- MAPEX Center for Materials and Processes
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Panja SK, Haddad B, Kiefer J. Clusters of the Ionic Liquid 1-Hydroxyethyl-3-methylimidazolium Picrate: From Theoretical Prediction in the Gas Phase to Experimental Evidence in the Solid State. Chemphyschem 2018; 19:3061-3068. [DOI: 10.1002/cphc.201800684] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Sumit K. Panja
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 Karnataka India
| | - Boumediene Haddad
- Department of Chemistry; Dr Moulay Tahar University; Saïda EN-NASR, BP:138 Algeria
| | - Johannes Kiefer
- Technische Thermodynamik; Universität Bremen; Badgasteiner Str. 1 28359 Bremen Germany
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Abstract
With the availability of easy-to-use commercial instrumentation for infrared (IR) and Raman spectroscopy, the number of users is growing very fast. Even in labs in which no personnel with experience in spectroscopy is around, spectra can be recorded and analyzed. However, for an inexperienced person it is virtually impossible to check whether a spectrum is plausible. In this Note, it is demonstrated that even comparing an experimental spectrum with data from a database may lead to significant errors. The vibrational spectrum of dimethyl sulfoxide (DMSO) is presented as an example.
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Affiliation(s)
- Johannes Kiefer
- Technische Thermodynamik, Universität Bremen, Bremen, Germany
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Rullich CC, Kiefer J. Enantioselective Raman spectroscopy (esR) for distinguishing between the enantiomers of 2-butanol. Analyst 2018; 143:3040-3048. [PMID: 29878000 DOI: 10.1039/c8an00705e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The first experimental application of enantioselective Raman spectroscopy (esR) is demonstrated using the example of the chiral alcohol 2-butanol. Samples of the neat enantiomers and the racemic mixture were analyzed in a self-built Raman set-up. The Raman spectrum allows the discrimination of the chemical species. It is shown that the optical rotation of a Raman peak with a small depolarization ratio can be measured. In addition, without any sample modification, e.g. chiral solvent, the enantiomers are distinguishable at a suitable half-wave retarder angle detecting only the vertically polarized component of the Raman signal.
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Affiliation(s)
- Claudia C Rullich
- University of Bremen, Technische Thermodynamik, Badgasteiner Str. 1, 28359 Bremen, Germany
| | - Johannes Kiefer
- University of Bremen, Technische Thermodynamik, Badgasteiner Str. 1, 28359 Bremen, Germany and University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany.
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Chen Y, Zhang H, Zhou W, Deng C, Liao J. The solvent effects on dimethyl phthalate investigated by FTIR characterization, solvent parameter correlation and DFT computation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 199:412-420. [PMID: 29649677 DOI: 10.1016/j.saa.2018.03.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/15/2018] [Accepted: 03/16/2018] [Indexed: 06/08/2023]
Abstract
This study set out with the aim of investigating the solvent effects on dimethyl phthalate (DMP) using FTIR characterization, solvent parameter correlation and DFT calculation. DMP exposed to 17 organic solvents manifested varying shift in the carbonyl stretching vibration frequency (νCO). Non-alkanols induced Band I and alkanols produced Band I and Band II. Through correlating the νCO with the empirical solvent scales including acceptor parameter (AN), Schleyer's linear free energy parameter (G), and linear free salvation energy relationships (LSER), Band I was mainly ascribed to non-specific effects from either non-alkanols or alkanol polymers ((alkanol)n). νCO of the latter indicated minor red shift and less variability compared to the former. An assumption was made and validated about the sequestering of hydroxyl group by the bulky hydrophobic chain in (alkanol)n, creating what we refer to as "screening effects". Ab initio calculation, on the other hand, provided insights for possible hydrogen binding between DMP and (ethanol)n or between ethanol monomers. The two components of Band I observed in inert solvents were assigned to the two CO groups adopting differentiated conformations. This in turn prompted our consideration that hydrogen binding was highly selective in favor of lowly associated (alkanol)n and the particular CO group having relatively less steric hindrance and stronger electron-donating capacity. Band II was therefore believed to derive from hydrogen-bond interactions mainly in manner of 1:1 and 1:2 DMP-(alkanol)n complexes.
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Affiliation(s)
- Yi Chen
- Department of Chemistry, Zhejiang Institute of Metrology, Tianmushan Road No. 222, Hangzhou 310007, Zhejiang, PR China.
| | - Hui Zhang
- Department of Chemistry, Zhejiang Institute of Metrology, Tianmushan Road No. 222, Hangzhou 310007, Zhejiang, PR China
| | - Wenzhao Zhou
- Department of Chemistry, Zhejiang Institute of Metrology, Tianmushan Road No. 222, Hangzhou 310007, Zhejiang, PR China
| | - Chao Deng
- Department of Chemistry, Zhejiang Institute of Metrology, Tianmushan Road No. 222, Hangzhou 310007, Zhejiang, PR China
| | - Jian Liao
- Department of Environmental Science and Engineering, Zhejiang University of Technology, Hangzhou 310004, Zhejiang, PR China
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Kiefer J, Stuckenholz M, Rathke B. Influence of the alkyl chain on the vibrational structure and interionic interactions in 1-alkyl-3-methylimidazolium trifluoromethanesulfonate ionic liquids. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.180] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Serra PB, Rocha MA, Rathke B, Růžička K, Fulem M, Kiefer J. Infrared spectroscopy of the symmetric branched isomers of n-heptanol. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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