Michaela Fridrichová

Michaela Fridrichová
Charles University in Prague | CUNI · Faculty of Science - Department of Inorganic Chemistry

PhD

About

53
Publications
3,239
Reads
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308
Citations
Citations since 2017
24 Research Items
238 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
Introduction
Michaela Fridrichová currently works at the Charles University in Prague, Faculty of Sciences, Department of Inorganic Chemistry. Michaela is responsible for teaching laboratory courses and does research in Inorganic Chemistry, Materials Chemistry and Solid-state Chemistry.
Additional affiliations
October 2015 - December 2018
The Czech Academy of Sciences
Position
  • PostDoc Position
September 2013 - September 2015
The Czech Academy of Sciences
Position
  • Researcher
January 2013 - December 2013
The Czech Academy of Sciences
Position
  • Researcher
Education
September 2007 - September 2012
Charles University in Prague
Field of study
  • Inorganic Chemistry
September 2002 - September 2007
Charles University in Prague
Field of study
  • Inorganic Chemistry

Publications

Publications (53)
Article
Full-text available
A 6-month-old kitten, male, domestic shorthair cat was presented with dwarfism, ocular and nasal discharge, and Ascaris infestation. Congenital hyposomatotropism was diagnosed on the basis of serum level of insulin-like growth factor-1 (IGF-I). The cat was treated with human recombinant growth hormone for 9 weeks. After that, his liver enzymes beca...
Article
Full-text available
Background Shelters and similar facilities with a high concentration and fluctuation of animals often have problems with various infections, which are usually difficult to solve in such environments and are very expensive to treat. This study investigated the eradication of Microsporum canis , the widespread cause of zoonotic dermatophytosis in she...
Article
Full-text available
Seven inorganic salts containing N-phenylbiguanide as a prospective organic molecular carrier of nonlinear optical properties were prepared and studied within our research of novel hydrogen-bonded materials for nonlinear optics (NLO). All seven salts, namely N-phenylbiguanidium(1+) nitrate (C2/c), N-phenylbiguanidium(1+) perchlorate (P-1), N-phenyl...
Preprint
Full-text available
The most important bands for the evaluation of strain in graphene (the 2D and 2D prime modes) are investigated. It is shown that for Bernal-stacked bilayers, the two-phonon Raman features have three different components that can be assigned to processes originating solely from the top graphene layer, bottom graphene layer, and from a combination of...
Preprint
Full-text available
The graphene-enhanced Raman scattering of Rhodamine 6G molecules on pristine, fluorinated and 4-nitrophenyl functionalized graphene substrates was studied. The uniformity of the Raman signal enhancement was studied by making large Raman maps. The relative enhancement of the Raman signal is demonstrated to be dependent on the functional groups, whic...
Preprint
Full-text available
Graphene possesses unique features that make it attractive for nanotechnology. Functional devices often require combination of several materials with specific functions, and graphene-polymer composites are one of them. Herein, we report on the preparation of PEDOT:Graphene bilayers by in situ polymerization of EDOT on covalently functionalized grap...
Preprint
Full-text available
Graphene is a material of great potential in a broad range of applications, for each of which specific tuning of the materials properties is required. This can be achieved, for example, by covalent functionalization. We have exploited two protocols for surface grafting, either by diazonium salts or by nucleophilic exchange, to perform graphene cova...
Article
Full-text available
The reversible organization of nanomagnets into highly anisotropic assemblies is of considerable interest for many applications, including theragnostic strategies in vivo. The current preparation strategies lead to structures that are not stable without the permanent presence of an applied magnetic field (MF); otherwise, irreversible assemblies are...
Article
We present a safe, clean, convenient and easy-to-control method for extensive fluorination of graphene using laser-ablation-assisted decomposition of gaseous SF6 molecules. The decomposition process is based on irradiation of a silicon target using a Nd:YAG laser (532 nm) in an SF6 atmosphere. The reactive species produced in the plume above the si...
Article
Manipulating nanoscopic objects by external stimuli is the cornerstone of nanoscience. Here, we report the implemen-tation of dynamic covalent chemistry in the reversible binding and directional motion of fluorescent nanodiamond particles at a functionalized graphene surface via imine linkages. The dynamic connections allow for controlling the form...
Article
The graphene-enhanced Raman scattering of Rhodamine 6G molecules on pristine, fluorinated and 4-nitrophenyl functionalized graphene substrates was studied. The uniformity of the Raman signal enhancement was studied by making large Raman maps. The relative enhancement of the Raman signal is demonstrated to be dependent on the functional groups, whic...
Article
Single layer graphene (SLG) is envisaged to improve significantly the substrates for surface-enhanced Raman scattering of planar aromatic molecules as it can ensure a more even enhancement at different places of the substrate. For this purpose, the role of SLG as a spacer in such SERS platforms has to be addressed. Here, we report preparation and R...
Article
Full-text available
Using the distal molar of a minipig as a model, we studied changes in the microstructural characteristics of apatite crystallites during enamel maturation (16-23 months of postnatal age), and their effects upon the mechanical properties of the enamel coat. The slow rate of tooth development in a pig model enabled us to reveal essential heterochroni...
Data
Spearman correlation coefficients among particular variables. (PDF)
Data
A cross section of post-talonid part of m3 of a16-month-old individual. note the enamel surface with no aprismatic enamel cover. (TIF)
Data
Coeficients of Wilcoxon statistics with age as categorial variable. (PDF)
Data
Selected enamel areas undergoing XRD experiments (i.e.: inner, outer, mesial, distal parts). (TIF)
Data
A corellation trends of selected michromechanical properties. (TIF)
Data
Examined individuals. EdEc—expected duration of enamel calcification. (PDF)
Data
Mean values and sigma statistics of particular variables under study. (PDF)
Data
Spearman correlation plot of studied variables. (TIF)
Article
The alkali silica reaction (ASR), which originates in highly alkaline conditions in concrete where reactive forms of silica are available, causes serious damage to concrete structures. The ASR potential of various quartz-rich aggregates (pegmatite quartz, quartzite, quartz meta-greywacke, and chert) was quantified using accelerated mortar bar test...
Article
The family of known guanylurea(1+) sulphates was extended for two novel triclinic (space group P-1) members - bis(guanylurea(1+)) sulphate dihydrate and tetrakis(guanylurea(1+)) bis(hydrogen sulphate) sulphate. Additionally, the monoclinic (space group P21/n) guanylurea(1+) hydrogen selenate was also isolated and characterised. Besides of X-ray dif...
Article
Graphene possesses unique features that make it attractive for nanotechnology. Functional devices often require combination of several materials with specific functions, and graphene-polymer composites are one of them. Herein, we report on the preparation of PEDOT:Graphene bilayers by in situ polymerization of EDOT on covalently functionalized grap...
Article
Objectives: Dermatophytosis, commonly known as ringworm, is a superficial fungal skin disease and zoonosis. Pythium oligandrum is a micromycete with mycoparasitic properties that is used in agriculture to control fungal infections on plants. Formulations containing P oligandrum were also developed for the treatment of dermatophytoses, but only sev...
Article
The mineralogical composition of mining wastes deposited in countless dumps around the world is the key factor that controls retention and release of pollutants. Here we report a multi-method data set combining mineralogical (X-ray diffraction, electron microprobe and Raman microspectrometry) and geochemical (sequential extraction and pore water an...
Article
In this report important Raman modes for the evaluation of strain in graphene (the 2D and 2D') are analyzed. The isotope labeling is used to disentangle contribution of individual graphene layers of graphene bilayer to the studied Raman modes. It is shown that for Bernal-stacked bilayers, the 2D and the 2D' Raman modes have three distinct component...
Article
Various doping levels of graphene on SiO2/Si substrates are reported in the literature. We show by in situ Raman spectroscopy that the heating of chemical vapor deposited graphene on SiO2/Si during the transfer process is the main factor causing this unintended doping of graphene samples. Large areas of graphene were analyzed using Raman spectrosco...
Article
Controlling the functionalization of graphene is essential for many applications. Here, we probed the reactivity of monolayer and bilayer graphene samples with intentionally prepared specific numbers of defects. Fluorination was used as a model reaction. We demonstrate that the reactivity of the single-layer graphene is not significantly affected b...
Article
Monoclinic non-centrosymmetric guanylurea(1+) hydrogen phosphite (GUHP), (NH2)2CNHCO(NH2)H2PO3, was found to be an attractive SRS-active crystal manifesting numerous χ(3)- and χ(2)-nonlinear optical interactions. In particular, with picosecond single- and dual-wavelength pumping SHG, THG (via cascaded parametric four-wave processes), high-order Sto...
Article
The vibrational spectra of a novel material exhibiting remarkable linear and nonlinear optical properties, guanylurea(1+) hydrogen phosphite, have been studied. The FTIR and FT Raman spectra of its polycrystalline samples at the room temperature have been recorded along with polarized Raman spectra of its oriented single crystal slice. The assignme...
Article
The chloride and l-tartrate salts of the 2,4-diaminoquinazolinium(1+) were prepared and characterized by both X-ray diffraction and infrared spectroscopy. The potential of the 2,4-diaminoquinazolinium(1+) cation as a building block for materials for nonlinear optics was assessed using quantum mechanical computations. Both 2,4-diaminoquinazolinium(1...
Article
Full-text available
In the title compound, C2H7N4O+·BF4 −, inter­molecular N—H⋯O hydrogen bonds connect the cations into chains parallel to the c axis, with graph-set motif C(4). These chains are in turn connected into a three-dimensional network by inter­molecular N—H⋯F hydrogen bonds. The B—F distances distances in the anion are not equal.
Article
Two polymorphs of bis(2-carbamoylguanidinium) fluorophosphonate dihydrate, 2C(2)H(7)N(4)O(+)·FO(3)P(2-)·2H(2)O, are presented. Polymorph (I), crystallizing in the space group Pnma, is slightly less densely packed than polymorph (II), which crystallizes in Pbca. In (I), the fluorophosphonate anion is situated on a crystallographic mirror plane and t...
Article
The title compounds, 2-carbamoylguanidinium hydrogen fluorophosphonate, C(2)H(7)N(4)O(+)·HFO(3)P(-), (I), 2-carbamoylguanidinium-hydrogen fluorophosphonate-hydrogen phosphite (1/0.76/0.24), C(2)H(7)N(4)O(+)·0.76HFO(3)P(-)·0.24H(2)O(3)P(-), (II), and 2-carbamoylguanidinium-hydrogen fluorophosphonate-hydrogen phosphite (1/0.115/0.885), C(2)H(7)N(4)O(...
Article
Full-text available
In the crystal structure of the title compound, C4H13N5 2+·2NO3 −, the main inter­molecular inter­actions are the N—H⋯O hydrogen bonds between the cationic amino groups and the O atoms of the nitrate ions. All amino H atoms and nitrate O atoms are involved in the three-dimensional hydrogen-bond network. There are two graph-set motifs R 2 2(8), whic...
Article
Full-text available
The title structure, 3C2H7N4O+·HFPO3 −·FPO3 2−·H2O, contains three independent 2-carbamoylguanidinium cations, one fluoro­phospho­nate, one hydrogen fluoro­phospho­nate and one water mol­ecule. There are three different layers in the structure that are nearly perpendicular to the c axis. Each layer contains a cation and the layers differ by the res...
Article
A detailed experimental investigation of the spontaneous noncollinear second harmonic generation in biaxial guanylurea(1 +) hydrogen phosphite (GUHP) crystal is reported. The number and shape of the resulting second harmonic hollow cones depend explicitly on the direction of propagation of the fundamental beam with respect to the optical axes and t...
Article
Linear and nonlinear optical properties of a spontaneously grown non-centrosymmetric crystal of guanylurea(1+) hydrogen phosphite (GUHP) were investigated. Optically negative biaxial crystals of GUHP exhibit a birefringence higher than calcite. Highly anisotropic refractive indices of GUHP and its nonlinear optical coefficients were determined. Pha...
Article
Full-text available
Searching for novel compounds with a potential for applications in optics is an actual task of materials research. Particular attention is focused on materials exhibiting desirable nonlinear optical properties. Polarizable organic compounds with delocalized π-electrons often exhibit such properties as second harmonic generation with high efficiency...
Article
A novel and promising material, guanylurea(1+)hydrogen phosphite, which belongs to the group of inorganic salts of polarizable organic molecules was prepared. Its real potential for optical applications is based on the simplicity of synthesis, good ability to crystallize, transparency, thermal stability and efficiency of the second harmonic generat...

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