Daniel Rentsch

Daniel Rentsch
Empa - Swiss Federal Laboratories for Materials Science and Technology | Empa · Laboratory for Functional Polymers

Dr.

About

147
Publications
31,519
Reads
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5,152
Citations
Citations since 2017
62 Research Items
3435 Citations
20172018201920202021202220230200400600
20172018201920202021202220230200400600
20172018201920202021202220230200400600
20172018201920202021202220230200400600
Additional affiliations
August 1996 - present
Empa - Swiss Federal Laboratories for Materials Science and Technology
Position
  • NMR spectroscopist
August 1991 - March 1997
University of Zurich
Position
  • NMR Group

Publications

Publications (147)
Article
A series of new tailored a-diimine Ni (II) complexes (Ni-OH, Ni-FOH, Ni-PhOH, and Ni-PhFOH) containing bulky ortho-N-aryl groups with various dibenzhydryl substitutes was successfully synthesized, characterized and applied in ethylene polymerization. The a-diimine ligands and Ni (II) complexes were characterized by ¹H, ¹⁹F, and ¹³C NMR, elemental a...
Article
Polymer solid electrolytes for solid-state batteries typically suffer from low ionic conductivity and low oxidative stability. We report a polymer electrolyte based on a polymerized ionic liquid and an ionic liquid plasticizer offering simultaneously a high room-temperature ionic conductivity of 0.8 mS cm ⁻¹ and a high oxidative stability > 5.0 V v...
Article
The water-in-salt concept has significantly improved the electrochemical stability of aqueous electrolytes, and the hybridization with organic solvents or ionic liquids has further enhanced their reductive stability. [1] Here, we open a large design space by introducing succinonitrile as a cosolvent in water/ionic liquid/succinonitrile hybrid elect...
Article
Full-text available
The effect of carbonates on the formation of magnesium silicate hydrate phases (M-S-H) was investigated in paste experiments. At molar ratio Mg/Si = 1.5, M-S-H pastes were synthesised from silica fume and MgO or MgO/hydromagnesite in a sodium carbonate-rich environment (dissolved 1.7 g of Na 2 CO 3 for 100 g of binder). Thermogravimetric analysis,...
Article
Polymer Electrolytes In article number 2200412, Chengyin Fu and co‐workers develop a nonflammable polymer solid electrolyte, based on a low‐cost polymerized ionic liquid, with a high room‐temperature ionic conductivity of 0.8 mS cm−1 and a high oxidative stability > 5.0 V vs Li+/Li. The electrolyte enables high‐performance solid‐state lithium metal...
Article
Aluminum sulfate shows a positive effect on preventing efflorescence of magnesium potassium phosphate (MKP) cements. Its influence on the MKP cement properties and hydration is explored in this study. Compared to a reference cement (Mg/PO4 molar ratio = 4, w/c ratio = 0.25), aluminum sulfate retards setting, increases compressive strength, and has...
Article
Full-text available
The water‐in‐salt concept has significantly improved the electrochemical stability of aqueous electrolytes, and the hybridization with organic solvents or ionic liquids has further enhanced their reductive stability, enabling cell chemistries with up to 150 Wh kg−1 of active material. Here, a large design space is opened by introducing succinonitri...
Article
Polymer solid electrolytes for solid‐state batteries typically suffer from low ionic conductivity and low oxidative stability. Herein, a polymer electrolyte based on a polymerized ionic liquid and an ionic liquid plasticizer offering simultaneously a high room‐temperature ionic conductivity of 0.8 mS cm−1 and a high oxidative stability >5.0 V versu...
Article
The influence of hydrothermal aging on the structural and catalytic properties of two commercial Fe-exchanged zeolite catalysts (Fe-FER and Fe-ZSM-5) in extruded form employed for the removal of N2O from...
Article
Hydrophobic wrinkled silica nanoparticles (WSNs) were obtained by surface functionalization with perfluorodecyltriethoxysilane (PDTES) by chemical vapour deposition (CVD). Surface functionalization was made to design a hydrophobic surface to immobilize lipase in its open active conformation by interfacial activation. Moreover, to modulate the close...
Article
The effect of an alumina-based binder on the structure of a commercial Fe-ZSM-5 catalyst has been investigated. Several ex-situ characterization techniques were used to show that the binder in the catalyst formulation allows obtaining a material that possesses improved features in terms of Fe species dispersion, framework Al content and acidity. UV...
Article
Full-text available
Ureido-functionalized compounds play an indispensable role in important biochemical processes, as well as chemical synthesis and production. Isocyanates, and KOCN in particular, are the preferred reagents for the ureido functionalization of amine-bearing compounds. In this study, we evaluate the potential of urea as a reagent to graft ureido groups...
Article
Water‐in‐salt electrolytes have successfully expanded the electrochemical stability window of aqueous electrolytes beyond 2 V. Further improvements in stability can be achieved by partially substituting water with either classical organic solvents or ionic liquids. Here, we study ternary electrolytes composed of LiTFSI, water, and imidazolium ionic...
Article
Water‐in‐salt electrolytes have successfully expanded the electrochemical stability window of aqueous electrolytes beyond 2 V. Further improvements in stability can be achieved by partially substituting water with either classical organic solvents or ionic liquids. Here, we study ternary electrolytes composed of LiTFSI, water, and imidazolium ionic...
Article
Full-text available
Shortwave infrared (SWIR) optical sensing and imaging are essential to an increasing number of next-generation applications in communications, process control or medical imaging. An all-organic SWIR upconversion device (OUC) consists of an organic SWIR sensitive photodetector (PD) and an organic light-emitting diode (OLED), connected in series. OUC...
Article
Full-text available
Hydroborate-based solid electrolytes have recently been successfully employed in high voltage, room temperature all-solid-state sodium batteries. The transfer to analogous lithium systems has failed up to now due to the lower conductivity of the corresponding lithium compounds and their high cost. Here LiB 11 H 14 nido-hydroborate as a cost-effecti...
Article
Full-text available
A facile methodology to durably modify cellulose fibers by forming in-situ phosphine oxide macromolecular physical networks is developed in this work. Such networks were formed by treating the cellulose fibers with a mixture of Michael adducts [trivinyl phosphine oxide (TVPO) and cyclic amines (piperazine and 2,4,6-tri(piperazine-1-yl)-1,3,5-triazi...
Article
Full-text available
The incorporation of sodium and aluminium in magnesium silicate hydrate phases (M-S-H), possible binding phases in magnesium silicate cement, was investigated. Magnesium alumino silicate hydrate containing sodium (M-A-S-H N samples) were synthesised in batch experiments with NaNO3 ~ 100 mmol/L at Mg/Si ratios equal to 0.8 and 1.2, and Al/Si ratios...
Article
Full-text available
Supported ruthenium was used in the liquid phase catalytic transfer hydrogenation of furfural. To improve the stability of Ru against leaching, phosphorous was introduced on a Ru/Al2O3 based catalyst upon impregnation with ammonium hypophosphite followed by either reduction or calcination to study the effect of phosphorous on the physico-chemical p...
Article
Full-text available
Biotransformation plays a crucial role in regulating the bioaccumulation potential and toxicity of organic compounds in organisms but is, in general, poorly understood for emerging contaminants. Here, we have used diclofenac as a model compound to study the impact of biotransformation on the bioaccumulation potential and toxicity in two keystone aq...
Article
Full-text available
Alkali-silica reaction (ASR) can cause expansion and cracking of concrete. Despite significant progress over the past 80 years, the molecular structures of the ASR products remain poorly understood. These reaction products are present in very small amounts within concrete aggregates, which severely limit their chemical and physical characterization...
Article
Five-membered nitrogen-containing heterocyclic compounds (azoles) belong to potential moieties in complex structures where transformations during ozonation can occur. This study focused on the azole-ozone chemistry of pyrrole, imidazole, and pyrazole as model compounds. Reaction kinetics and ozonation products were determined by kinetic and analyti...
Article
Design and synthesis of nanostructured responsive gels have attracted increasing attention, particularly in the biomedical domain. Polymer chain configurations and nanodomain sizes within the network can be used to steer their functions as drug carriers. Here, a catalyst free facile one-step synthesis strategy is reported for the design of pH-respo...
Article
Closo-borates and closo-carborates recently emerged as promising class of solid electrolytes for all-solid-state batteries, but are too expensive. Here we introduce NaB11H14nido-borates as a new building block for solid electrolytes that can be synthesized via a cost-effective low-temperature method using cheap NaBH4 as chemical feedstock. We emplo...
Article
The incorporation of aluminum in magnesium silicate hydrate (M-S-H) phases was investigated. Magnesium (alumino) silicate hydrate (M-(A-)S-H) with Mg/Si ratios equal to 1.1 or 1.7 and Al/Si ranging from 0 to 0.2 were synthetized in batch experiments and equilibrated at 20, 50 and 70 °C. pH values between 9 and 10.5 were observed and aluminum up to...
Article
2,6-dichlorobenzamide (BAM) is a major groundwater micropollutant posing problems for drinking water treatment plants (DWTPs) that depend on groundwater intake. Aminobacter sp. MSH1 uses BAM as a sole source of carbon, nitrogen and energy and is considered a prime biocatalyst for groundwater bioremediation in DWTPs. Its use in bioremediation requir...
Article
A fast and simple, one-step synthesis for the preparation of silica aerogel powders is reported. A waterglass based sol was prepared without prior ion-exchange and stirred with an immiscible organic phase (heptane) that contains the hydrophobization agent (hexamethyldisilazane). The addition of nitric acid triggers gelation and subsequently the hyd...
Article
Full-text available
In this article, we report the synthesis of 2,4,6-substituted s-triazine-based organophosphorus compounds via a two-step process, which enables their production in high yields, and with a high purity as solids. In the first step, a Michaelis–Arbuzov rearrangement of cyanuric chloride with triethyl phosphite afforded 2,4,6-trisdiethoxyphosphinyl-1,3...
Article
Full-text available
Aspartimide (Asi) formation is a notorious side reaction in peptide synthesis that is well characterized and described in literature. In this context, we observed significant amounts of chain termination in Fmoc‐SPPS while synthesizing the N‐terminal Xaa‐Asp‐Yaa motif. This termination was caused by the formation of piperazine‐2,5‐diones. We invest...
Article
Aerogels are mesoporous materials with a rapidly growing thermal insulation market interest, partly because ambient pressure drying (APD) reduces cost. Silica gels must be hydrophobized to prevent condensation reactions and irreversible shrinkage during APD. Here, we study how hydrophobization with mono-, di-, and trifunctional organoalkoxysilanes...
Article
Coordination complexes of magnesium borohydride show promising properties as solid electrolytes for magnesium ion batteries and warrant a thorough microscopic description of factors governing their mobility properties. Here, the dynamics of Mg(BH4) 2 - diglyme 0.5 on the atomic level are investigated by means of quasielastic neutron scattering (QEN...
Article
Full-text available
The role of various additives (emulsifier, anti-dripping agent) and formulation procedures (pre-dispersion of solid additives in polyol via milling) which influence the flame retardancy of 6,6′-[ethan-1,2-diylbis(azandiyl)]bis(6H-dibenzo[c,e][1,2]oxaphosphin-6-oxid) (EDA-DOPO) containing flexible polyurethane foams has been investigated in this wor...
Preprint
In this work we have investigated the role of various additives (emulsifier, anti-dripping agent) and formulation procedure (pre- dispersion of solid additives in polyol via milling) which influence the flame retardancy of 6,6′-[ethan-1,2-diylbis(azandiyl)]bis(6H-dibenzo[c,e][1,2]oxaphosphin-6-oxid) (EDA-DOPO) containing flexible polyurethane foams...
Presentation
Many strategies have been proposed for carbon dioxide (CO 2 ) reduction aiming to close the carbon cycle and compensate anthropogenic CO 2 emissions. Electrochemical CO 2 reduction has several advantages that it can be carried out under ambient conditions with water as the only additional feedstock, and electricity generated from renewable sources...
Article
Stereochemical effects during two-dimensional crystallization of bisheptahelicene diastereomers on a Cu(111) surface have been studied with scanning tunnelling microscopy. The (M,M)- and (P,P)-enantiomers crystallize into a monolayer racemate lattice, whereas...
Article
Full-text available
Synthesis of intermediate containing P(O)-Cl bonds is the key to converting P(O)-H bonds to P(O)-N. In this work we have performed chlorination reactions of different H-phosphinates and H-phosphonates using N-chlorosuccinimide as an environmentally-benign chlorinating agent. The chlorination reaction showed high yield and high selectivity for trans...
Article
Transient activation of biochemical reactions by visible light and subsequent return to the inactive state in the absence of light is an essential feature of the biochemical processes in photoreceptor cells. To mimic such light-responsiveness with artificial nanosystems, polymersome nanoreactors were developed that can be switched on by visible lig...
Article
A tin-modified copper foam for the efficient and selective reduction of CO2 to CO is reported. We employ a cost-efficient electrodeposition route to form a three-dimensional porous dendrite architecture, in which each dendrite possesses a copper core and a copper oxide/tin oxide shell. The sparse tin species on the electrode surface play a key role...
Article
Hybrid perovskite crystals with organic and inorganic structural components are able to combine desirable properties from both classes of materials. Electronic interactions between the anionic inorganic framework and functional organic cations (such as chromophores or semiconductors) can give rise to unusual photophysical properties. Cyanine dyes a...
Article
Lignin is the most abundant aromatic biopolymer functioning as an integral compound of woody materials. In its unmodified form it shows limited water solubility and is relatively unreactive. Thus, biotechnological lignin valorisation for high performance applications is highly underexploited. To expand its application, a new synthesis route towards...
Article
Full-text available
Li2B12H12 is commonly considered as a boron sink hindering the reversible hydrogen sorption of LiBH4. Recently, in the dehydrogenation process of LiBH 4 an amorphous H-deficient Li2B12H12−x phase was observed. In the present study, we investigate the rehydrogenation properties of Li2B12H12−x to form LiBH4. With addition of nanostructured cobalt bor...
Article
Full-text available
Cellulose nanocrystals (CNCs) with >2000 photoactive groups can act as highly efficient initiators for radical polymerizations, cross-linkers, as well as covalently embedded nanofillers for nanocomposite hydrogels. This is achieved by a simple and reliable method for surface modification of CNCs with a photoactive bis(acyl)phosphane oxide derivativ...
Article
Pinoresinol is a dimer of two β-β'-linked coniferyl alcohol molecules. It is both a plant defense molecule synthesized through the shikimic acid pathway and a representative of several β-β-linked dimers produced during the microbial degradation of lignin in dead plant material. Until now, little has been known about the bacterial catabolism of such...
Article
Co-impregnation of vanadia and tungsta on titania produced highly active catalysts for the reduction of nitrogen oxides with ammonia but showed aging tendencies at temperatures around 600 °C. In order to preserve their low temperature activity after hydrothermal aging up to 650 °C, the catalysts were enriched with Si during the co-impregnation proc...
Article
Cellulose nanocrystals (CNCs) with >2000 photoactive groups can act as highly efficient initiators for radical polymerizations, cross-linkers, as well as covalently embedded nanofillers for nanocomposite hydrogels. This is achieved by a simple and reliable method for surface modification of CNCs with a photoactive bis(acyl)phosphane oxide derivativ...
Article
Exhaust after-treatment selective catalytic reduction (SCR) systems based on urea-water solution are state-of-the-art technologies mitigating NOx emissions for diesel and lean combustion systems. Major challenges for implementing the systems are high NOx reduction performance, uniform mixture formation and solid deposits formation. This study prese...
Article
This communication presents the first synthesis of nanoconfined Lithium closo-borate, Li2B12H12, using nanoporous SiO2 as scaffold. The yield of Li2B12H12 is up to 94 mol%. The as-synthesized nanoconfined Li2B12H12 exhibites a structual transition around 380 °C and conversion to H-deficiency Li2B12H12-x at 580 °C.
Conference Paper
Full-text available
While alternative less carbon intensive propulsion and powertrain systems have advanced in other areas of mobility, aviation will likely rely on the combustion of hydrocarbon fuels for decades to come. Currently, alternative aviation fuels from non-fossil feedstocks are considered the most viable way to reduce the carbon intensity of the aviation s...
Article
High ionic conductivity of up to 6.4 × 10−3 S cm−1 near room temperature (40 °C) in lithium amide-borohydrides is reported, comparable to values of liquid organic electrolytes commonly employed in lithium-ion batteries. Density functional theory is applied coupled with X-ray diffraction, calorimetry, and nuclear magnetic resonance experiments to sh...
Article
Na2(B12H12)0.5(B10H10)0.5, a new solid-state sodium electrolyte is shown to offer high Na+ conductivity of 0.9 mS cm-1 at 20 °C, excellent thermal stability up to 300 °C, and a large electrochemical stability window of 3 V including stability towards sodium metal anodes, all essential prerequisites for a stable room-temperature 3 V all-solid-state...
Article
Ca(BH4)2 could reversibly store 9.6 wt% hydrogen based on the overall reaction of Ca(BH4)2 → 1/3CaB6 + 2/3CaH2 + 10/3H2. Formation of CaB6 instead of elemental boron and/or high boranes (e.g. CaB12H12) in the dehydrogenation process is crucial for the rehydrogenation. Here, we reported two experimental protocols regarding how to form CaB6 from the...
Article
A series of 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) based derivatives were synthesized and incorporated as flame retardant additives in rigid polyurethane foam (RPUF). The flame retardant performance of DOPO derivatives in RPUF was investigated and compared with traditional flame retardant tris(1-chloro-2-propyl) phosphate (TCPP)...
Article
Melt spinning and drawing of amorphous cyclo-olefin and co-polyamide polymeric materials were performed to develop mono-component continuous filaments. Raman spectroscopy was employed to assess the effect of a static bending deformation on the microstructure of the filaments. Spectra stemming from the fiber regions under tensile and compressive loa...
Article
The formation of magnesium silicate hydrates (M-S-H) with MgO to SiO2 ratios from 0.7 to 1.6 has been studied at 20, 50 and 70°C. TGA and XRD data reveal that initially brucite and M-S-H are formed while amorphous silica is still present as indicated by FT-IR and ²⁹Si MAS NMR experiments. In this first step M-S-H with Mg/Si ∼ 1 with pH values ∼ 9.4...
Article
The abatement of 9 polychloro-1,3-butadienes (CBDs) in aqueous solution by ozone, UV-C(254 nm) photolysis, and the corresponding advanced oxidation processes (AOPs) (i.e., O3/H2O2 and UV/H2O2) was investigated. The following parameters were determined for 9 CBDs: Second-order rate constants for the reactions of CBDs with ozone (kO3) (< 0.1 – 7.9×10...
Article
Nanophase-separated amphiphilic polymer co-networks are ideally suited as responsive membranes due to their stable co-continuous structure. Their functionalization with redox-responsive 2,2 0 :6 0 ,2 00-terpyridine–metal complexes and light-responsive spiropyran derivatives leads to a novel material with tunable optical, redox and permeability prop...
Article
Solid-state electrolytes have the potential to improve the safety properties of lithium-ion batteries. Many different materials have been proposed over the years. However, especially at lower temperatures (at or near room temperature), most solid-state electrolytes display lithium ion conductivities lower than the one of conventional organic liquid...
Article
Full-text available
Hexachlorocyclohexane (HCH) contaminated soils were treated for a period of up to 64 days in situ (HCH dumpsite, Lucknow) and ex situ (University of Delhi) in line with three bioremediation approaches. The first approach, biostimulation, involved addition of ammonium phosphate and molasses, while the second approach, bioaugmentation, involved addit...
Article
The main removal process for polar organic micropollutants during activated sludge treatment is biotransformation, which often leads to the formation of stable transformation products (TPs). As the analysis of TPs is challenging, the use of pathway prediction systems can help by generating a list of suspected TPs. To complete and refine pathway pre...
Article
Full-text available
A new synthesis of bis(acyl)phosphane oxide (BAPO) photoinitiators was developed which can be used to functionalize cellulose nanocrystals surfaces for polymer grafting. Hybrid materials with excellent graft yields can be rapidly obtained under mild and acid-free conditions.
Article
Full-text available
This communication presents a novel and solvent-free method to synthesise Mg(B3H8)2via the gas-solid reaction between B2H6 and Mg2NiH4, which overcomes the limitations of wet chemical methods requiring solvent removal.
Article
Carbon deposition during CO methanation from biomass-derived gas is a significant challenge in terms of catalyst lifetime. It results from the severe reaction conditions imposed by the presence of unsaturated hydrocarbons in the gasified feedstock. This work investigated the structure of boron-modified Ni/Al2O3 catalysts exhibiting enhanced carbon...
Article
The properties of silica aerogels, and the ability to prepare them by ambient pressure drying, hinge on their chemical surface modification. Until now, quantitative analysis of the surface chemistry has not been possible by state-of-the-art analytical methods. Here, we determine the surface chemistry of six archetypal, ambient pressure dried, hydro...
Article
A comparative approach for the surface silylation of nanofibrillated cellulose (NFC) in water is proposed through an environmentally friendly sol-gel route based on alkoxysilanes. NFC suspensions were freeze-dried under controlled conditions in the presence of methyltrimethoxysilane used as a model alkoxysilane. Two different protocols that involve...
Article
Simple bilayer organic solar cells rely on very thin coated films that allow for effective light absorption and charge carrier transport away from the heterojunction at the same time. However, thin films are difficult to coat on rough substrates or over large areas, resulting in adverse shorting and low device fabrication yield. Chemical p-type dop...
Article
Full-text available
We report that decomposition pathway of Ca(BH4)2 can be efficiently controlled by reaction temperature. That is, it decomposes into CaB6 at a lower temperature range of 320 to 350°C, but into amorphous boron at 400 to 450°C. We identified the formation of CaB2H6 as the crucial intermediate step on the way to CaB6 that only forms at 320 to 350°C.