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Droplet-based in situ X-ray absorption spectroscopy cell for studying crystallization processes at the tender X-ray energy range
(2019)RSC AdvancesThe understanding of nucleation and crystallization is fundamental in science and technology. In solution, these processes are complex involving multiple transformations from ions and ion pairs through amorphous intermediates to multiple crystalline phases. X-ray absorption spectroscopy (XAS), which is sensitive to liquid, amorphous and crystalline phases offers prospects of demystifying these processes. However, for low Z elements the ...Journal Article -
Towards a cooler Singapore
(2016)Global Journal of Science Frontier ResearchUrban heat island, together with urban noise and urban air pollution, are the three major environmental challenges of future more livable cities. Urban heat island is defined as the phenomenon that the air temperature in urban area is consistently higher than its rural area (Oke, 1973). It has posed similar heat-related stress and health issues (Kovats and Hajat, 2008; Lo and Quattrochi, 2003; Oikonomou et al., 2012), higher energy costs ...Journal Article -
Aryl bis-sulfonamides bind to the active site of a homotrimeric isoprenoid biosynthesis enzyme IspF and extract the essential divalent metal cation cofactor
(2018)Chemical ScienceCharacterizing the mode of action of non-covalent inhibitors in multisubunit enzymes often presents a great challenge. Most of the conventionally used methods are based on ensemble measurements of protein–ligand binding in bulk solution. They often fail to accurately describe multiple binding processes occurring in such systems. Native electrospray ionization mass spectrometry (ESI-MS) of intact protein complexes is a direct, label-free ...Journal Article -
Physics-based prediction of biopolymer degradation
(2019)Soft MatterIn the natural environment, insoluble biomatter provides a preeminent source of carbon for bacteria. Its degradation by microbial communities thus plays a major role in the global carbon-cycle. The prediction of degradation processes and their sensitivity to changes in environmental conditions can therefore provide critical insights into globally occurring environmental adaptations. To elucidate and quantify this macro-scale phenomenon, ...Journal Article -
In situ monitoring of SI-ATRP throughout multiple reinitiations under flow by means of a quartz crystal microbalance
(2018)RSC AdvancesAn investigation of the polymerisation of 2-hydroxyethyl methacrylate (HEMA) by means of surface-initiated atom transfer radical polymerisation (SI-ATRP) has been carried out in situ using a quartz crystal microbalance, with multiple reinitiations under continuous flow of the reaction mixture. The SI-ATRP kinetics of HEMA were studied continuously by means of changes in the frequency, varying conditions including temperature and solvent ...Journal Article -
Tuning and in situ monitoring of surface-initiated, atom-transfer radical polymerization of acrylamide derivatives in water-based solvents
(2019)Polymer ChemistryIn order to gain better control over the growth and dispersity of surface-tethered poly(acrylamides), the SI-ATRP kinetics of N-isopropylacrylamide (NIPAM), N,N-dimethylacrylamide (DMAM) and N-hydroxyethyl acrylamide (HEAM) have been systematically investigated in situ in an 80 : 20 ethanol/water mixture by means of the quartz crystal microbalance with dissipation (QCM-D). The addition of tetraethylammonium chloride (tEtAmCl) or ...Journal Article -
PANDITplus: toward better integration of evolutionary view on molecular sequences with supplementary bioinformatics resources
(2010)Trends in Evolutionary BiologyRecent comparative genomic and other large-scale bioinformatics studies increasingly have been using gene annotations, functional classifications, and complimentary data from the emerging “-omics” disciplines. Indeed, such analyses have better chances to uncover hidden patterns in complex multidimensional and heterogeneous biological systems data. On the other hand, inferences from such studies are extremely sensitive to data samples and ...Journal Article -
A versatile and membrane-less electrochemical reactor for the electrolysis of water and brine
(2019)Energy & Environmental ScienceRenewables challenge the management of energy supply and demand due to their intermittency. A promising solution is the direct conversion of the excess electrical energy into valuable chemicals in electrochemical reactors that are inexpensive, scalable, and compatible with irregular availability of electrical power. Membrane-less electrolyzers, deployed on a microfluidic platform, were recently shown to hold great promise for efficient ...Journal Article -
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Single-particle ICP-MS with online microdroplet calibration: toward matrix independent nanoparticle sizing
(2019)Journal of Analytical Atomic SpectrometrySingle-particle inductively coupled plasma mass spectrometry (sp-ICP-MS) has become an effective tool for the detection and quantification of inorganic nanoparticles (NPs). While sizing of NPs suspended in water is relatively straightforward by sp-ICP-MS, accurate mass quantification of NPs in complex media, such as consumer products and natural systems still remains a challenge. When NPs are suspended in a complex medium, the matrix may ...Journal Article