The Experts below are selected from a list of 67221 Experts worldwide ranked by ideXlab platform
Rachel K Oreilly - One of the best experts on this subject based on the ideXlab platform.
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advances and challenges in smart and Functional Polymer vesicles
Soft Matter, 2009Co-Authors: Rachel K OreillyAbstract:Polymer vesicles prepared by self-assembly techniques have attracted increasing scientific interest in recent years. This is as a result of their numerous potential applications such as tunable delivery vehicles, for the templating of biomineralization, as nanoreactors and as scaffolds for biological conjugation. Presented in this review are the recent advances in the preparation and application of ‘smart’ and Functional block coPolymer vesicles such as those which respond to external stimuli to afford a change in structure, morphology or controlled release event. In this Highlight, we first give an overview of the structure of Polymer vesicles, followed by a summary of the methods used for their preparation. We then focus on recently developed intelligent Polymer vesicles which can respond to the application of external stimuli such as a change in temperature, pH or redox to afford novel nanomaterials. The potential applications of these materials are explored with specific focus on the Functionalization of various domains of the Polymer vesicles. Finally, the current limitations in the preparation and application of Polymer vesicles are explored as are the challenges facing the development of these nanostructures towards real-world applications.
Namyoung Kim - One of the best experts on this subject based on the ideXlab platform.
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high performance porous mim type capacitive humidity sensor realized via inductive coupled plasma and reactive ion etching
Sensors and Actuators B-chemical, 2018Co-Authors: Tian Qiang, Cong Wang, Mingqing Liu, Kishor Kumar Adhikari, Junge Liang, Lei Wang, Guohui Yang, Fanyi Meng, Namyoung Kim, Zhao YaoAbstract:Abstract We propose a high-performance porous metal–insulator–metal-type capacitive humidity sensor based on a Functional Polymer mixed with TiO2 microparticles subjected to inductively coupled plasma (ICP) and reactive-ion etching (RIE) treatments. The humidity sensor is composed of a porous top electrode, a TiO2-containing Functional Polymer humidity-sensitive layer subjected to two types of oxygen plasma treatment, a bottom electrode, and a glass substrate. The initial O2 ICP dry-etching utilizes higher intensity plasma for deep etching in the inlet holes on the top electrode to increase the contact area and shorten the vapor absorption path, thereby yielding high sensitivity and low hysteresis. Further, the RIE treatment leads to roughening of the Polymer etching surface and further improving the performance of the humidity sensor. The Functional Polymer mixed with TiO2 microparticles exhibits excellent hysteresis over a wide humidity sensing range. The fabricated sensors are tested at various relative humidity (RH) values, achieving an ultra-low hysteresis of 0.64% RH at 60% RH, a high sensitivity of 1.24 pF/% RH, a fast response time of less than 25 s, good temperature dependence, and a stable capacitance value with a maximum error rate of 0.15% over 120 h of continuous testing.
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high sensitivity and low hysteresis porous mimtype capacitive humidity sensor using Functional Polymer mixed with tio2 microparticles
Sensors, 2017Co-Authors: Mingqing Liu, Cong Wang, Namyoung KimAbstract:In this study, a high-sensitivity and low-hysteresis porous metal–insulator–metal-type capacitive humidity sensor is investigated using a Functional Polymer mixed with TiO2 microparticles. The humidity sensor consists of an optimally designed porous top electrode, a Functional Polymer humidity sensitive layer, a bottom electrode, and a glass substrate. The porous top electrode is designed to increase the contact area between the sensing layer and water vapor, leading to high sensitivity and quick response time. The Functional Polymer mixed with TiO2 microparticles shows excellent hysteresis under a wide humidity-sensing range with good longterm stability. The results show that as the relative humidity ranges from 10% RH to 90% RH, the proposed humidity sensor achieves a high sensitivity of 0.85 pF/% RH and a fast response time of less than 35 s. Furthermore, the sensor shows an ultra-low hysteresis of 0.95% RH at 60% RH, a good temperature dependence, and a stable capacitance value with a maximum of 0.17% RH drift during 120 h of continuous test.
Devon A. Shipp - One of the best experts on this subject based on the ideXlab platform.
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Functional Polymer particles via thiol–ene and thiol–yne suspension “click” Polymerization
RSC Advances, 2015Co-Authors: Olivia Z. Durham, Hannah R. Norton, Devon A. ShippAbstract:Water-borne thiol–ene and thiol–yne Polymer particles were synthesized using several alkene, alkyne, and thiol monomers in suspension thiol–ene and thiol–yne “click” Polymerizations. In particular, we show that thiol–yne suspension Polymerizations are possible, and that thermal initiation provides similar results as previously reported photoinitiation of thiol–ene monomers. The particles were analyzed in terms of particle size, glass transition temperature (Tg), and ability to undergo chemical Functionalization. Composition and crosslink density clearly impacted the glass transition temperatures, with higher crosslink densities leading to higher Tg values. Polymer particles with excess alkene/alkyne or thiol Functionality were also synthesized to examine the influence of monomer stoichiometry on particle size and thermal properties of each system. Functionalization of thiol–ene Polymer particles was demonstrated using either the inclusion of an ene-Functionalized chromophore during the Polymerization, or post-Polymerization Functionalization using thiol–isocyanate chemistry.
Christopher Barnerkowollik - One of the best experts on this subject based on the ideXlab platform.
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single chain self assembly preparation of α ω donor acceptor chains via living radical Polymerization and orthogonal conjugation
Chemical Communications, 2010Co-Authors: Ozcan Altintas, Peter Gerstel, Nico Dingenouts, Christopher BarnerkowollikAbstract:α,ω-Hydrogen donor/acceptor Functional Polymer strands are prepared via a combination of living radical Polymerization and orthogonal conjugation and subsequently self-assembled as single chains to emulate—on a simple level—the self-folding behaviour of natural biomacromolecules.
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single chain self assembly preparation of α ω donor acceptor chains via living radical Polymerization and orthogonal conjugation
Institute for Future Environments; Science & Engineering Faculty, 2010Co-Authors: Ozcan Altintas, Peter Gerstel, Nico Dingenouts, Christopher BarnerkowollikAbstract:α,ω-Hydrogen donor/acceptor Functional Polymer strands are prepared via a combination of living radical Polymerization and orthogonal conjugation and subsequently self-assembled as single chains to emulate - on a simple level - the self-folding behaviour of natural biomacromolecules. © 2010 The Royal Society of Chemistry.
Mingqing Liu - One of the best experts on this subject based on the ideXlab platform.
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high performance porous mim type capacitive humidity sensor realized via inductive coupled plasma and reactive ion etching
Sensors and Actuators B-chemical, 2018Co-Authors: Tian Qiang, Cong Wang, Mingqing Liu, Kishor Kumar Adhikari, Junge Liang, Lei Wang, Guohui Yang, Fanyi Meng, Namyoung Kim, Zhao YaoAbstract:Abstract We propose a high-performance porous metal–insulator–metal-type capacitive humidity sensor based on a Functional Polymer mixed with TiO2 microparticles subjected to inductively coupled plasma (ICP) and reactive-ion etching (RIE) treatments. The humidity sensor is composed of a porous top electrode, a TiO2-containing Functional Polymer humidity-sensitive layer subjected to two types of oxygen plasma treatment, a bottom electrode, and a glass substrate. The initial O2 ICP dry-etching utilizes higher intensity plasma for deep etching in the inlet holes on the top electrode to increase the contact area and shorten the vapor absorption path, thereby yielding high sensitivity and low hysteresis. Further, the RIE treatment leads to roughening of the Polymer etching surface and further improving the performance of the humidity sensor. The Functional Polymer mixed with TiO2 microparticles exhibits excellent hysteresis over a wide humidity sensing range. The fabricated sensors are tested at various relative humidity (RH) values, achieving an ultra-low hysteresis of 0.64% RH at 60% RH, a high sensitivity of 1.24 pF/% RH, a fast response time of less than 25 s, good temperature dependence, and a stable capacitance value with a maximum error rate of 0.15% over 120 h of continuous testing.
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high sensitivity and low hysteresis porous mimtype capacitive humidity sensor using Functional Polymer mixed with tio2 microparticles
Sensors, 2017Co-Authors: Mingqing Liu, Cong Wang, Namyoung KimAbstract:In this study, a high-sensitivity and low-hysteresis porous metal–insulator–metal-type capacitive humidity sensor is investigated using a Functional Polymer mixed with TiO2 microparticles. The humidity sensor consists of an optimally designed porous top electrode, a Functional Polymer humidity sensitive layer, a bottom electrode, and a glass substrate. The porous top electrode is designed to increase the contact area between the sensing layer and water vapor, leading to high sensitivity and quick response time. The Functional Polymer mixed with TiO2 microparticles shows excellent hysteresis under a wide humidity-sensing range with good longterm stability. The results show that as the relative humidity ranges from 10% RH to 90% RH, the proposed humidity sensor achieves a high sensitivity of 0.85 pF/% RH and a fast response time of less than 35 s. Furthermore, the sensor shows an ultra-low hysteresis of 0.95% RH at 60% RH, a good temperature dependence, and a stable capacitance value with a maximum of 0.17% RH drift during 120 h of continuous test.
