ORCID Profile
0000-0003-4600-7833
Current Organisation
University of New South Wales
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Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1PY01180D
Abstract: The temperature-responsive core–shell hybrid nanoparticles PNIPAMs-AuNP have dual-functional applications as colorimetric temperature-sensors and reusable temperature-switchable catalysts.
Publisher: Elsevier BV
Date: 11-2022
Publisher: American Chemical Society (ACS)
Date: 10-02-2015
DOI: 10.1021/LA504829J
Abstract: We report herein the design and preparation of microgels that are responsive to both O2 and CO2 gases. The microgels were synthesized through soap-free emulsion copolymerization of O2-responsive monomer 2,3,4,5,6-pentafluorostyrene (FS) and CO2-responsive monomer 2-(diethylamino)ethyl methacrylate (DEA) with N,N'-methylenebis(acrylamide) (BisAM) as the cross-linker. The P(DEA-co-FS) microgels dispersed in aqueous solution could undergo volume phase transitions triggered by O2 and/or CO2 aeration. The particles were very responsive to CO2, while their responsivity to O2 was moderate. Microgels having different levels of the responsivity could be designed and prepared by varying the FS content in the copolymer. The phase transitions were also highly reversible, and the initial states of microgels could be easily recovered by "washing off" the trigger gases with N2. Multicycle O2, CO2, and N2 aerations were applied, and no loss in the dual gas responsivity and switchability was observed.
Publisher: Springer International Publishing
Date: 2017
DOI: 10.1007/12_2017_15
Publisher: Wiley
Date: 15-11-2019
DOI: 10.1002/APP.48733
Publisher: American Chemical Society (ACS)
Date: 31-01-2023
Publisher: American Chemical Society (ACS)
Date: 28-11-2018
Publisher: Springer Science and Business Media LLC
Date: 20-07-2021
Publisher: Elsevier BV
Date: 12-2016
DOI: 10.1016/J.JCIS.2016.08.034
Abstract: This paper reports synthesis of the first high internal phase emulsion (HIPE) system with double emulsion (DE) morphology (HIPE-DE). HIPE is a highly concentrated but highly stable emulsion system, which has a dispersed/internal phase fraction over 74vol%. DE represents an emulsion system that hierarchically encapsulates two immiscible phases. The combination of HIPE and DE provides an efficient method for fabrication of complex structures. In this work, HIPE-DE having a water-in-oil-in-water (W/O/W) morphology has been prepared for the first time via a simple one-step emulsification method with poly(2-(diethylamino)ethyl methacrylate) (PDEA) microgel particles as Pickering stabilizer. An oil phase fraction up to 90vol% was achieved by optimizing the microgel concentration in aqueous phase. The mechanism of the DE formation has been elucidated. It was found that while PDEA microgels stabilized the oil droplets in water, small amount protonated DEA monomers acted as surfactant and formed water-containing micelles inside the oil droplets. It was demonstrated that the W/O/W HIPE-DE could be precisely converted into porous polymer structures. With styrene as the oil phase in W/O/W HIPE-DE, porous polystyrene particles were obtained upon polymerization. With dissolved acrylamide as the aqueous phase and toluene as the continuous phase, porous polyacrylamide matrixes were prepared. Elevating temperature required for polymerization did not change the W/O/W HIPE-DE morphologies. This simple approach provides a versatile platform for synthesis of a variety of porous polymer systems.
Publisher: Elsevier BV
Date: 09-2020
Publisher: American Chemical Society (ACS)
Date: 08-06-2017
DOI: 10.1021/ACS.LANGMUIR.7B01092
Abstract: Microcapsules enabling precise delivery and controlled release are highly desirable. However, it is still challenging to control the release profile by regulating the microcapsule shell permeability. In this work, gas-switchable microgel colloidosome (MGC) with oxygen (O
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6PY01145D
Abstract: In this paper, we report the synthesis of oxygen (O 2 )-switchable thermo-responsive random copolymers based on fluorinated acrylamide monomer homologues: N -(2-fluoroethyl)acrylamide (F1EA), N -(2,2-difluoroethyl)acrylamide (F2EA), and N -(2,2,2-trifluoroethyl)acrylamide (F3EA).
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8FO01981A
Abstract: β-Carotene was encapsulated in natural lignin-stabilized HIPEs and exhibited good resistance to photodegradation and thermal degradation as well as bio-accessibility.
Publisher: Wiley
Date: 12-08-2013
DOI: 10.1002/APP.39638
Publisher: American Scientific Publishers
Date: 04-2021
Abstract: Polylactide- b -poly( N -isopropylacrylamide)- b -polystyrene (PLA- b -PNIPAM- b -PS) triblock copolymers (tri-BCPs) with various chemical compositions (block ratio) were prepared from the combination of ring-opening polymerization and reversible addition-fragmentation chain transfer polymerization. Subsequently, the self-assembling behaviors of these tri-BCP films obtained from spin-coating were investigated by annealing them under different solvent atmosphere. We found that these films could self-assemble into various morphologies due to the microphase separation of incompatible copolymer blocks. Atomic force microscopy confirmed the perpendicular cylindrical morphology self-assembled from PLA 4.5k - b -PNIPAM 5.2k - b -PS 22.4k tri-BCP film under mixed solvent atmosphere of toluene/acetone (7:3, v/v). Self-assembled PLA cylinders are evenly distributed among the PS matrix and perpendicular to the film surface, with PNIPAM component taking place at the PLA/PS interphase. Furthermore, by etching the degradable PLA component, porous PS film decorated with PNIPAM “brushes” hoisting channels were generated. This work provides a facile method and detailed protocol for fabricating stimuli-responsive porous films which are promising for thermoresponsive “smart” separation technologies.
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 11-2022
Publisher: American Chemical Society (ACS)
Date: 17-10-2017
DOI: 10.1021/ACS.LANGMUIR.7B02539
Abstract: Polymer membranes with switchable wettability have promising applications in smart separation. Hereby, we report highly porous poly(styrene-co-N,N-(diethylamino)ethyl methacrylate) (i.e., poly(St-co-DEA)) membranes with "open-cell" structure and CO
Publisher: American Chemical Society (ACS)
Date: 02-2023
Publisher: American Scientific Publishers
Date: 05-2018
Abstract: In this work, polylactide-b-poly(N-isopropylacrylamide) were synthesized by the combination of controlled ring-opening polymerization and reversible addition fragmentation chain transfer polymerization. These block copolymers with molecular weight range from 7,900 to 12,000 g/mol and narrow polydispersity (≤1.19) can self-assemble into micelles (polylactide core, poly(N-isopropylacrylamide) shell) in water at certain temperature range, which have been evidenced by laser particle size analyzer proton nuclear magnetic resonance and transmission electron microscopy. Such micelles exhibit obvious thermo-responsive properties: (1) Poly(N-isopropylacrylamide) blocks collapse on the polylactide core as system temperature increase, leading to reduce of micelle size. (2) Micelles with short poly(N-isopropylacrylamide) blocks tend to aggregate together when temperature increased, which is resulted from the reduction of the system hydrophilicity and the decreased repulsive force between micelles.
Publisher: Wiley
Date: 29-04-2016
Abstract: In this work, CO2 -breathing induced reversible activation of mechanophore within microgels is reported. The microgels are prepared through soap-free emulsion polymerization of CO2 -switchable monomer 2-(diethylamino)ethyl-methacrylate, using spiropyran (SP) based mechanophore MA-SP-MA as cross-linker. The microgels can be swollen by CO2 aeration. The swelling of microgels activates the SP mechanophore into merocyanine, causing distinguished color and fluorescence change. Moreover, these transitions are highly reversible, and the initial states of microgels can be easily recovered by "washing off" CO2 with N2 . The present contribution represents the first ex le of CO2 -breathing activation of mechanophore within microgels.
Publisher: American Chemical Society (ACS)
Date: 08-07-2021
Publisher: American Chemical Society (ACS)
Date: 25-01-2023
Publisher: American Chemical Society (ACS)
Date: 07-12-2017
Abstract: Herein, we report the development of a novel CO
Publisher: American Chemical Society (ACS)
Date: 27-06-2016
Publisher: Elsevier BV
Date: 10-2020
Publisher: American Chemical Society (ACS)
Date: 12-06-2019
DOI: 10.1021/ACS.LANGMUIR.9B01115
Abstract: Advanced liquid-repelling materials that resist both water-based and oil-based contaminants have significant applications in many fields. Herein, a novel protocol for the fabrication of a robust poly(high internal phase emulsion) (polyHIPE)-based slippery liquid-infused porous surface (SLIPS) system with combined self-repairing and self-cleaning properties is developed. Specifically, polystyrene-based polyHIPE (PS-HIPE) membranes with an interconnected porous structure were prepared from polymerization of the continuous oil phase in the water-in-oil HIPE templates. These polyHIPE membranes were used, for the first time, as porous substrates for loading low surface tension silicone oils as lubricating liquids for the fabrication of polyHIPE-based SLIPS membranes. These polyHIPE-based SLIPS membranes could easily repel both water- and oil-based contaminants (e.g., ink, milk, and coffee) with very low sliding angles (3.0 ? 1.3?) and could even repel solid contaminants (e.g., dust) upon washing with water. Meanwhile, such membranes exhibit excellent self-repairing properties so that physical scratching damage, such as cutting a trench, does not affect the liquid-repelling performance. The liquid-repelling ability could be recovered completely within 10 s. More significantly, such a SLIPS membrane shows excellent durability so that the water sliding angle of the SLIPS could be maintained at less than 5.0? for about 80 cycles owing to the regenerated poly(dimethylsiloxane) layer on the surface. This work represents a robust methodology to enrich the development of hydrophobic and oleophobic slippery surfaces, which is promising for many areas, such as biomedical, self-cleaning, antifouling, and self-repairing materials.
Publisher: American Chemical Society (ACS)
Date: 25-04-2017
DOI: 10.1021/ACSMACROLETT.7B00245
Abstract: Gas-responsive polymers have inspired much interest over the past ten years. Gas triggers can interact with functionalities on polymer chains and, thus, modulate their chain structures, architectures, and aggregation states. This review summarizes the latest research progresses in the theme of developing different gas triggers for fine control over some critical properties of polymers, as well as their potential applications in various areas. We focus on the interactions/reactions between gases and gas-responsive functionalities of polymers and highlight some state-of-art developments, which provided good insight and understanding of each particular gas-responsive polymer. We also offer a perspective point of view on future research directions on gas-responsive polymers, both in fundamental studies and in potential application developments.
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 2020
Publisher: American Chemical Society (ACS)
Date: 03-01-2019
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 04-2022
Publisher: American Chemical Society (ACS)
Date: 19-10-2017
Publisher: Elsevier BV
Date: 12-2022
Publisher: American Chemical Society (ACS)
Date: 23-03-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8FO01981A
Abstract: β-Carotene was encapsulated in natural lignin-stabilized HIPEs and exhibited good resistance to photodegradation and thermal degradation as well as bio-accessibility.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9FO00320G
Abstract: Curcumin was encapsulated inside the sulfomethylated lignin stabilized HIPEs and exhibited superior UV and oxidative degradation resistance and antibacterial properties.
No related grants have been discovered for Lei Lei.