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Gabriela Mera
Technische Universität Darmstadt
38Publications
17H-index
1,896Citations
Publications 38
Newest
Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt),
Sabyasachi Sen31
Estimated H-index: 31
(University of California, Davis),
Gabriela Mera17
Estimated H-index: 17
(Technische Universität Darmstadt)
... more
Abstract Mg and Ca substituted silicon oxycarbides are investigated with respect to their network architecture, enthalpy of formation and bioactivity. The synthesized materials have highly connected structural network with an open architecture and a minor but critical fraction of depolymerized Q-species. This combination of structural features allows for providing bioactivity at the same time with enhanced thermo-mechanical robustness and crystallization resistance. It is argued that silicon oxy...
Ref 56Cited 4
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Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt),
Wenjie Li5
Estimated H-index: 5
(Technische Universität Darmstadt),
Leonore Wiehl1
Estimated H-index: 1
(Technische Universität Darmstadt)
... more
Nanocrystalline Gd2O2NCN (P3 ̅m1, crystallite size 30-40 nm) was synthesized upon ammonolysis of bis[[(N-carboxymethyl,N-carboxy-κO-methyl)amino-κN]-ethyl]-glycinato(3-)-κN,κO]gadolinium-(III) (diethylenetriamine pentaacetic acid gadolinium (III) dihydrogen salt or gadopentetic acid, Gd-H2DTPA hereafter) at 900 °C. The conversion of Gd-H2DTPA into Gd2O2NCN takes place in several steps, probably via transient formation of iminodiacetate-, glycinate- and carbamate-containing complexes of Gd. Therm...
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Xifan Wang1
Estimated H-index: 1
(Technische Universität Darmstadt),
Gabriela Mera17
Estimated H-index: 17
(Technische Universität Darmstadt),
Koji Morita21
Estimated H-index: 21
(National Institute for Materials Science)
... more
Within the present work, reduced-graphene oxide (rGO)/silicon nitride (Si3N4) nanocomposites were prepared upon pyrolysis of a graphene oxide (GO)-filled polysilazane. The novel preparative approach consists in the synthesis of the polysilazane in the presence of different concentrations of GO, yielding a homogeneous GO/polysilazane composite which was subsequently thermally converted in Ar atmosphere into rGO/Si3N4 nanocomposites. Hot-pressing of the obtained nanocomposite powders delivered mon...
Ref 27Cited 4
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Cornelia Hintze1
Estimated H-index: 1
(Technische Universität Darmstadt),
Koji Morita21
Estimated H-index: 21
(National Institute for Materials Science),
Ralf Riedel52
Estimated H-index: 52
(Technische Universität Darmstadt)
... more
Novel silica-containing nanocomposites with a controlled carbon phase based on high quality reduced graphene oxide (rGO) were prepared via a cheap and facile sol–gel method, followed by pyrolysis in inert gas atmosphere. The resulting nanocomposite materials have an intimate bonding between rGO of low defect density and a partially crystalline silica matrix, as shown by Raman, FTIR and HRTEM studies. This processing route allows a straight-forward control of the content of the carbon phase and a...
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Sarabjeet Kaur4
Estimated H-index: 4
(Technische Universität Darmstadt),
Gabriela Mera17
Estimated H-index: 17
(Technische Universität Darmstadt),
Ralf Riedel52
Estimated H-index: 52
(Technische Universität Darmstadt)
... more
Within the present work, boron-containing silicon carbide (SiBC) powders and monoliths were prepared from a polyborocarbosilane. The main aspect addressed here relates to the fate of boron in the prepared SiBC ceramics, which has not been clarified unambiguously so far. X-ray diffraction data, corroborated with XPS, FTIR and Raman spectroscopic results indicate that boron preferably gets incorporated within the segregated carbon phase present in polycarbosilane-derived SiC; thus, the prepared Si...
Ref 53Cited 5
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Amon Klausmann1
Estimated H-index: 1
(Technische Universität Darmstadt),
Koji Morita21
Estimated H-index: 21
,
Kurt E. Johanns7
Estimated H-index: 7
(Technische Universität Darmstadt)
... more
Herein we report on the preparation and high-temperature evolution of polysilylcarbodiimides-derived SiCN ceramic coatings. Two polysilylcarbodiimide-based preceramic polymers with different molecular structures (i.e., a rather linear and a highly-branched polymer) were synthesized and their use for the preparation of sub-μm-thick SiCN ceramic coatings was assessed. The different molecular architecture of the polysilylcarbodiimide has been shown to significantly affect the composition (e.g., the...
Ref 37Cited 10
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Yohei Shimokawa3
Estimated H-index: 3
(Nagoya Institute of Technology),
Akikazu Fujiwara1
Estimated H-index: 1
(Nagoya Institute of Technology),
Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt)
... more
Metal–organic precursor for aluminum nitride (AlN) ceramics was synthesized by reacting aluminum tri-chloride (AlCl3) with bis(trimethylsilyl)carbodiimide (BTSC). Fourier transform infra-red (FT-IR) spectrum of the synthesized precursor exhibited characteristic absorption bands assigned to the carbodiimide (N=C=N) group at 2150–2250, and 851 cm−1, while the solid state 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectrum of the precursor exhibited single signal at 103 ppm whic...
Ref 34Cited 1
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Gabriela Mera17
Estimated H-index: 17
(Technische Universität Darmstadt),
Markus Gallei24
Estimated H-index: 24
(Technische Universität Darmstadt),
Samuel Bernard1
Estimated H-index: 1
... more
The present Review addresses current developments related to polymer-derived ceramic nanocomposites (PDC-NCs). Different classes of preceramic polymers are briefly introduced and their conversion into ceramic materials with adjustable phase compositions and microstructures is presented. Emphasis is set on discussing the intimate relationship between the chemistry and structural architecture of the precursor and the structural features and properties of the resulting ceramic nanocomposites. Vario...
Ref 417Cited 51
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Gabriela Mera17
Estimated H-index: 17
(Technische Universität Darmstadt),
Ryo Ishikawa18
Estimated H-index: 18
(University of Tokyo),
Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt)
... more
Within the present study, atomic-scale electron microscopy investigation on the crystallization behavior of polysilylcarbodiimide-derived SiCN was performed. The as-prepared SiCN sample was found to be homogeneous and consisted of amorphous silicon nitride nano-domains dispersed within an amorphous, highly entangled graphene-like carbon matrix. Annealing of the sample at 1400 ◦ C induced a slight increase of the ordering of the carbon phase. Additionally, the crystallization onset of the silicon...
Ref 50Cited 10
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Yohei Shimokawa3
Estimated H-index: 3
(Nagoya Institute of Technology),
Akikazu Fujiwara1
Estimated H-index: 1
(Nagoya Institute of Technology),
Emanuel Ionescu20
Estimated H-index: 20
(Technische Universität Darmstadt)
... more
The luminescence properties related to the thermal polymer/ceramic conversion behavior of silicon dicarbodiimide {SDC, [Si(N=C=N)2]n} have been investigated. SDC was synthesized by the non-oxidic sol–gel condensation reaction of silicon tetrachloride with bis(trimethylsilyl)carbodiimide. As-synthesized SDC showed no luminescence under UV light, while heat-treated SDC showed an appreciable photoluminescence (PL) and the maximum visible PL emission intensity was achieved by heat treatment at 400°C...
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