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71.
72.
Beng Sim Chuah Florence Geneste Andrew B. Holmes Rainer E. Martin Henning Rost Franco Cacialli Richard H. Friend Hans‐Heinrich Hrhold Steffen Pfeiffer Do‐Hoon Hwang 《Macromolecular Symposia》2000,154(1):177-186
The synthesis of the highly fluorescent mono‐ and bis‐silylated poly(1,4‐phenylene vinylene) derivatives 1 and 2 is reported. The Gilch dehydrohalogenation polycondensation and the Horner synthesis of strictly alternating copolymers have been used to prepare the copolymers 8‐11 and 14, 16‐18 , respectively, in which the tunability of various optoelectonic properties may be examined systematically. 相似文献
73.
Matt Jellicoe Aghil Igder Clarence Chuah Darryl B. Jones Xuan Luo Keith A. Stubbs Emily M. Crawley Scott J. Pye Nikita Joseph Kasturi Vimalananthan Zoe Gardner David P. Harvey Xianjue Chen Filomena Salvemini Shan He Wei Zhang Justin M. Chalker Jamie S. Quinton Youhong Tang Colin L. Raston 《Chemical science》2022,13(12):3375
Mixing immiscible liquids typically requires the use of auxiliary substances including phase transfer catalysts, microgels, surfactants, complex polymers and nano-particles and/or micromixers. Centrifugally separated immiscible liquids of different densities in a 45° tilted rotating tube offer scope for avoiding their use. Micron to submicron size topological flow regimes in the thin films induce high inter-phase mass transfer depending on the nature of the two liquids. A hemispherical base tube creates a Coriolis force as a ‘spinning top’ (ST) topological fluid flow in the less dense liquid which penetrates the denser layer of liquid, delivering liquid from the upper layer through the lower layer to the surface of the tube with the thickness of the layers determined using neutron imaging. Similarly, double helical (DH) topological flow in the less dense liquid, arising from Faraday wave eddy currents twisted by Coriolis forces, impact through the less dense liquid onto the surface of the tube. The lateral dimensions of these topological flows have been determined using ‘molecular drilling’ impacting on a thin layer of polysulfone on the surface of the tube and self-assembly of nanoparticles at the interface of the two liquids. At high rotation speeds, DH flow also occurs in the denser layer, with a critical rotational speed reached resulting in rapid phase demixing of preformed emulsions of two immiscible liquids. ST flow is perturbed relative to double helical flow by changing the shape of the base of the tube while maintaining high mass transfer between phases as demonstrated by circumventing the need for phase transfer catalysts. The findings presented here have implications for overcoming mass transfer limitations at interfaces of liquids, and provide new methods for extractions and separation science, and avoiding the formation of emulsions.Micron to submicron size Coriolis and Faraday wave induced high shear topological flow regimes in 45° titled rapidly rotating tubes result in high inter-phase mass transfer of immiscible liquids and spontaneous demixing. 相似文献
74.
Dr. Mhd. Abd. Cader Mhd. Haniffa Dr. Khadija Munawar Assoc. Prof. Dr. Yern Chee Ching Assoc. Prof. Dr. Hazlee Azil Illias Prof. Dr. Cheng Hock Chuah 《化学:亚洲杂志》2021,16(11):1281-1297
New and emerging demand for polyurethane (PU) continues to rise over the years. The harmful isocyanate binding agents and their integrated PU products are at the height of environmental concerns, in particular PU (macro and micro) pollution and their degradation problems. Non-isocyanate poly(hydroxy urethane)s (NIPUs) are sustainable and green alternatives to conventional PUs. Since the introduction of NIPU in 1957, the market value of NIPU and its hybridized materials has increased exponentially in 2019 and is expected to continue to rise in the coming years. The secondary hydroxyl groups of these NIPU′s urethane moiety have revolutionized them by allowing for adequate pre/post functionalization. This minireview highlights different strategies and advances in pre/post-functionalization used in biobased NIPU. We have performed a comprehensive evaluation of the development of new ideas in this field to achieve more efficient synthetic biobased hybridized NIPU processes through selective and kinetic understanding. 相似文献
75.
The synthesis of α-ZrP with a range of crystallinity is of high importance due to the different requirements in various applications.Nanosized crystalline α-ZrP is typically obtained by refluxing amorphous ZrP in concentrated H3PO4 solutions.Microcrystalline α-ZrP are obtained by direct precipitation in the presence of either HF or oxalic acid which are used as complexing agents for zirconium.These larger crystals are useful as ion-exchangers in column-type applications as the back pressure can be significantly reduced.A novel minimalistic synthesis that is green,simple and fast is highlighted in this review.Both nano-sized and micro-sized α-ZrP can be prepared via this protocol to meet many potential applications.Applications of α-ZrP in ion-exchange,catalysis,lubricants,intercalation hosts,polymer fillers and fire retardants are discussed. 相似文献
76.
Gunathilake Thennakoon M. Sampath U. Ching Yern Chee Uyama Hiroshi Hai Nguyen Dai Chuah Cheng Hock 《Cellulose (London, England)》2022,29(3):1821-1840
Cellulose - Nanocellulose/polyvinyl alcohol/curcumin (CNC/PVA/curcumin) nanoparticles with enhanced drug loading properties were developed by the dispersion of nanocellulose in curcumin/polyvinyl... 相似文献
77.
Meng-Kiat Chuah 《Journal of Algebra》2012,351(1):138-159
We add combinatorial data to the Dynkin diagrams to classify all finite order automorphisms on contragredient Lie superalgebras, and study their invariant subalgebras. 相似文献
78.
Chuah K Lai LM Goon IY Parker SG Amal R Justin Gooding J 《Chemical communications (Cambridge, England)》2012,48(29):3503-3505
Herein, we demonstrate the use of modified gold-coated magnetic nanoparticles as 'dispersible electrodes' which act as selective capture vehicles for electrochemical detection of prostate-specific antigen (PSA). A key advantage of this system is the ability to quantify non-electrochemical active analytes such as proteins with unprecedented detection limits and fast response times. 相似文献
79.
Lai LM Goon IY Chuah K Lim M Braet F Amal R Gooding JJ 《Angewandte Chemie (International ed. in English)》2012,51(26):6456-6459
New sensation: A resistance-based biosensor uses gold-coated magnetic nanoparticles (Au@MNPs) functionalized with the antibiotic enrofloxin (see picture; purple), which bind to anti-enrofloxin as analyte (blue). The Au@MNPs can be magnetically assembled between electrodes, and the measured resistance R is a function of analyte concentration. 相似文献
80.
Keng Hoo Chuah Kazunori Kuwana Kozo Saito Forman A. Williams 《Proceedings of the Combustion Institute》2011,33(2):2417-2424
Air entrainment, leading to strong fire whirls, is commonly thought to be caused by the buoyant rise of the hot combustion products under the influence of gravity. We have, however, created in the laboratory steady, axisymmetric strong fire whirls with axes inclined 30° from the vertical orientation, whirls which model an inclined fire whirl, about 30 m tall, observed in California wildland near the Cleveland National Forest. The results contradict the common notion of buoyancy being significant for the structure of the whirl, implying that strong fire whirls instead are dominated by rotation only, even if their axis is vertical. The new concept of rotation-controlled fire whirls is explained by a Rossby number displacing the Froude number (or the Richardson number) in describing the phenomenon. 相似文献