Synthesis and Characterization of Main Chain Polyimides Containing Chalcone Derivatives for LC Alignment

Selo, Muhammed; Skarp, Kent; Hilborn, Jöns

doi:10.1295/polymj.pj2005218

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…These derivatives might be useful in single molecule fluorescence imaging . Polyimides that can be coated on films and show optical anisotropy have been synthesized at room temperature by the reaction of diols with diimides using the Mitsunobu protocol . This procedure was deemed useful for temperature sensitive applications.…”

Section: Amines Amides (Including Nucleobases) or Azides As Nucleophilesmentioning

confidence: 99%

Mitsunobu and Related Reactions: Advances and Applications

et al. 2009

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His research interests include Organophosphorus Chemistry and Main Group Chemistry. He has over 115 publications so far and is a fellow of the Indian Academy of Sciences, Bangalore. N. N. Bhuvan Kumar was born in Cherukupalli, Guntur, India. After completing his B.Sc. from Nagarjuna University, he joined the School of Chemistry, University of Hyderabad, as a postgraduate student in the year 2000 and obtained his Master's degree in Chemistry. Currently, he is pursuing a Ph.D. on Organophosphonates under the supervision of Prof. K. C. Kumara Swamy. E. Balaraman was born in Kancheepuram, Chennai, India, in 1980. He received his M.Sc. in Chemistry from Vivekananda College [Madras University (2002)] and his Ph.D. degree in the areas of organophosphonates and modified BINOLs under the guidance of Prof. K. C. Kumara Swamy. Presently he is a postdoctoral fellow with Professors David Milstein and Ronny Neumann at the Weizmann Institute of Science, Israel. K. V. P. Pavan Kumar was born in Hyderabad (Andhra Pradesh), India, in 1979. He obtained his B.Sc. (Chemistry Honors) and M.Sc. (Chemistry) degrees from Sri Sathya Sai Institute of Higher Learning, Puttaparthi, A.P., India. He obtained his Ph.D. degree under the guidance of Prof. K. C. Kumara Swamy in October 2006. Presently he is working as a postdoctoral fellow in the area of hydroamination reactions using new titanium catalysts with Prof. Pierre Le Gendre at the Universite ´de Bourgogne, France.

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Section: Amines Amides (Including Nucleobases) or Azides As Nucleophilesmentioning

confidence: 99%

Mitsunobu and Related Reactions: Advances and Applications

et al. 2009

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“…[19] Thesuccessful removal of PEO and crosslinking of PChal through UV treatment are further demonstrated by IR spectroscopy (Supporting Information, Figure S4 B). [21] Carboxyl groups are generated after cleavage of the ONB group,asevidenced by the appearance of ab road peak at 3300 cm À1 . [15h, 20] Both of these peaks disappear after removal of the PEO.T he photo-crosslinking of the chalcone mesogens is also verified by the disappearance of the peaks at 1660 and 1587 cm À1 ,w hich correspond to C = Oa nd C = C groups,respectively,after UV irradiation.…”

mentioning

confidence: 99%

“…[15h, 20] Both of these peaks disappear after removal of the PEO.T he photo-crosslinking of the chalcone mesogens is also verified by the disappearance of the peaks at 1660 and 1587 cm À1 ,w hich correspond to C = Oa nd C = C groups,respectively,after UV irradiation. [21] Carboxyl groups are generated after cleavage of the ONB group,asevidenced by the appearance of ab road peak at 3300 cm À1 .…”

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confidence: 99%

Biomimetic Nanofluidic Diode Composed of Dual Amphoteric Channels Maintains Rectification Direction over a Wide pH Range

Sui

Zhang

et al. 2016

Angewandte Chemie

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pH-gated ion channels in cell membranes play important roles in the cellsp hysiological activities.M any artificial nanochannels have been fabricated to mimic the natural phenomenon of pH-gated ion transport. However, these nanochannels show pH sensitivity only within certain pH ranges.W ide-range pH sensitivity has not yet been achieved. Herein, for the first time,w ep rovide av ersatile strategy to increase the pH-sensitive range by using dual amphoteric nanochannels.Inparticular,amphoteric polymeric nanochannels with carboxyl groups derived from ab lockc opolymer (BCP) precursor and nanochannels with hydroxylg roups made from anodic alumina oxide (AAO) were used. Due to as ynergistic effect, the hybrid nanochannels exhibit nanofluidic diode properties with single rectification direction over awide pH range.The novel strategy presented here is ascalable, low-cost, and robust alternative for the construction of largearea membranes for nanofluidic applications,s uch as the separation of biomolecules.Ion transport through the biological nanochannels of cell membranes is important for maintaining an organisms physiological activities. [1] Fore xample,t he influenza M 2 protein, aw ell-known pH-gated ion channel, plays ac ritical role in virus uncoating. [2] Thep H-sensitive ion transport depends mainly on the amphoteric residues along the channel. By tuning the ionization states of the functional groups at different pH values,t he microenvironment of the channels is changed. As ar esult, the charge distribution affects ion transport, and consequently,a lso affects the processes that cells perform to maintain essential life activities,s uch as diffusion, osmosis,a nd phagocytosis [3] Many artificial nanochannels have been designed to mimic the phenomena in the living systems.F or example,a n asymmetric chemical modification of an hourglass-shaped nanochannel has pH-gating ion transport properties. [4] Conical single nanochannels grafted with zwitterionic polymers or proteins exhibit pH-tunable rectifying characteristics. [5] Amphoteric conical nanopores functionalized with lysine and histidine groups give remarkable rectification characteristics at different pH values. [6] Artificial ion-transport nanochannels that display ionic selectivity,ionic rectification, and ionic gating in response to pH are of general interest because of the potential applications in biosensing, [5, 7] molecular filtration, [8] and energy harvesting [9] .H owever, these pH sensitive systems show narrow pH windows,t hat is,t hey are only activated at certain pH values,o rr everse their rectification directions when the local pH values change from acidic to basic, which limits their practical applications.I ti s desirable to construct ab iomimetic nanofluidic diode with as ingle rectification direction over aw ide pH range, preferably by using as imple,v ersatile,e ngineered methodology.Nanochannels have been produced using various fabrication techniques,i ncluding ion track etching, [10] electrochemical etching, [11] laser technology, [12] ...

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Biomimetic Nanofluidic Diode Composed of Dual Amphoteric Channels Maintains Rectification Direction over a Wide pH Range

Sui

Zhang

et al. 2016

Angew Chem Int Ed

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pH-gated ion channels in cell membranes play important roles in the cell's physiological activities. Many artificial nanochannels have been fabricated to mimic the natural phenomenon of pH-gated ion transport. However, these nanochannels show pH sensitivity only within certain pH ranges. Wide-range pH sensitivity has not yet been achieved. Herein, for the first time, we provide a versatile strategy to increase the pH-sensitive range by using dual amphoteric nanochannels. In particular, amphoteric polymeric nanochannels with carboxyl groups derived from a block copolymer (BCP) precursor and nanochannels with hydroxyl groups made from anodic alumina oxide (AAO) were used. Due to a synergistic effect, the hybrid nanochannels exhibit nanofluidic diode properties with single rectification direction over a wide pH range. The novel strategy presented here is a scalable, low-cost, and robust alternative for the construction of large-area membranes for nanofluidic applications, such as the separation of biomolecules.

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Synthesis and Characterization of Main Chain Polyimides Containing Chalcone Derivatives for LC Alignment

Cited by 10 publications

References 24 publications

Mitsunobu and Related Reactions: Advances and Applications

Mitsunobu and Related Reactions: Advances and Applications

Biomimetic Nanofluidic Diode Composed of Dual Amphoteric Channels Maintains Rectification Direction over a Wide pH Range

Biomimetic Nanofluidic Diode Composed of Dual Amphoteric Channels Maintains Rectification Direction over a Wide pH Range

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