A5024547972- Membrane Separation and Gas Transport
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Graphene research and applications
- Covalent Organic Framework Applications
- Muon and positron interactions and applications
- Graphene and Nanomaterials Applications
- Nanopore and Nanochannel Transport Studies
- Solar-Powered Water Purification Methods
- Nanomaterials for catalytic reactions
- Spacecraft and Cryogenic Technologies
- Advanced Sensor and Energy Harvesting Materials
- Adsorption and Cooling Systems
- Crystallization and Solubility Studies
- Hydrogen Storage and Materials
- MXene and MAX Phase Materials
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Electrospun Nanofibers in Biomedical Applications
- Advanced Battery Materials and Technologies
- Supramolecular Chemistry and Complexes
- Advanced Thermoelectric Materials and Devices
- Synthesis and properties of polymers
- Surface Modification and Superhydrophobicity
National University of Singapore
2014-2022
University of Twente
2012
Precise molecular sieving architectures with Janus superhighways are constructed via a molecularly engineered interfacial reaction between cyclodextrin (CD) and trimesoyl chloride (TMC). Interestingly, the CD/TMC nanofilms both hydrophobic inner cavities hydrophilic channels exhibit exceptionally high permeances for polar nonpolar solvents. The precise functions determined by type of CD building blocks intrinsic 3D hollow bowls. Positron annihilation spectroscopy (PAS) confirms that larger...
Abstract Thin-film composite membranes formed by conventional interfacial polymerization generally suffer from the depth heterogeneity of polyamide layer, i.e., nonuniformly distributed free volume pores, leading to inefficient permselectivity. Here, we demonstrate a facile and versatile approach tune nanoscale homogeneity polyamide-based thin-film via inorganic salt-mediated process. Molecular dynamics simulations various characterization techniques elucidate in detail underlying molecular...
Mixed matrix membranes (MMMs) based on metal organic frameworks (MOFs) have been extensively studied for carbon capture to combat global warming. Here we report the introduction of machine learning get more insights. Random forest models are first trained by literature data CO2/CH4 separation, which reveal optimum MOF structure with pore size >1 nm and surface area ∼800 m2 g−1. Then, representative MOFs blended into Pebax-2533 polymer intrinsic microporosity-1 fabricate MMMs. The demonstrate...
Thin-film nanocomposites (TFN) functionalized with tunable molecular-sieving nanomaterials have been employed to tailor membranes, an enhanced permeability and selectivity. Herein, water-soluble hollow cup-like macrocyclic molecules, sulfothiacalix[4]arene (STCAss) sulfocalix[4]arene (SCA), are ionically bonded into the polyamide network engineer properties of TFN membranes for organic solvent forward osmosis (OSFO). Introducing both STCAss SCA not only increases free volume, but also...
A series of 6FDA-Durene-ZIF71 mixed matrix membranes (MMMs) comprising three different ZIF-71 particle sizes (i.e., 30, 200, and 600 nm) have been fabricated to investigate the effects size on gas separation performance MMMs. Compared MMMs containing > 200 nm, embedded with ≤ nm exhibited significantly enhanced performance. The O2 N2 permeability higher than predicted ones using Maxwell model. By considering inefficiently packed polymer chain sieve-in-a-cage phenomena, modified model...
The H2 /CO2 separation properties of di/triamine vapor cross-linked mixed matrix membranes with molecularly tuned free-volume at 150 °C are reported. Free-volume is by altering the degree chain-motion using cross-linkers different chain lengths. A more restricted achieved in network and resultant membrane has a higher selectivity °C.
Improving the stability and photocatalytic performance of GO/PI composite membranes by a one-step cross-linking method.
Tackling membrane wetting is an ongoing challenge for large-scale applications of distillation (MD). Herein, composite Janus MD membranes comprising ultrathin dense hydrophilic layer are developed by layer-by-layer assembling cationic polyethyleneimine and anionic poly(sodium 4-styrenesulfonate) polyelectrolytes on a hydrophobic polyvinylidene fluoride substrate. Using surfactant-containing saline water as the feed with low surface tension, experiments reveal that number polyelectrolyte...
Abstract The considerable performance enhancement of small molecule‐sieving nanofiltration membrane has been achieved by the functional combination between host–guest chemistry and interfacial polymerization (IP) for first time in this work. First, water‐insolubility cucurbit[6]uril (CB6) was ameliorated constructing complex (CB6‐PIP) with piperazine. Second, incorporation water‐soluble CB6‐PIP selective layer via IP leads to generation not only enlarged conventional polyamide network...
Abstract The synthesis of a polymer that combines the processability plastics with extreme rigidity cross-linked organic networks is highly attractive for molecular sieving applications. However, are typically insoluble or infusible, preventing them from being processed as plastics. Here, we report solution-processable conjugated microporous thermoset permanent pores ~0.4 nm, prepared by simple heating process. When employed two-dimensional membrane hydrogen separation, exhibits ultrahigh...
Unique macrocyclic cavities facilely infiltrated into polymer scaffolds as size-sieving molecular gatekeepers guarding non-selective micropores for ultra-efficient gas separation.
A green method to fabricate poly(m-phenylene isophthalamide) (PMIA) based thin-film composite membranes has been developed for organic solvent nanofiltration (OSN). For the first time, porous PMIA membrane substrates are cast from dope solutions prepared by an environmentally benign ionic liquid and selective layer is synthesized on top of glutaraldehyde (GA) modified substrate (mPMIA) via imine condensation between hyper-branched polyethylenimine (HPEI) using water as reaction media....