Quantum Interference and Spin Filtering Effects in Photo-responsive Single Molecular Device

2021 ◽  
Author(s):  
Ashima Bajaj ◽  
Rishu Khurana ◽  
Md. Ehesan Ali
Keyword(s):  
Quantum Interference ◽  
Spin States ◽  
Molecular Device ◽  
Stimuli Responsive ◽  
Responsive Systems ◽  
External Stimuli ◽  
Spin Filtering

The development of stimuli responsive systems that can switch between two distinct spin states under the application of an external stimuli has always remained an illusory challenge. Here, we report...

scholarly journals Quantum Interference and Spin Filtering Effects in Photo-responsive Endoperoxide Based Single Molecular Device

2021 ◽  
Author(s):  
Ashima Bajaj ◽  
Rishu Khurana ◽  
Md. Ehesan Ali
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Density Functional ◽  
Reaction Pathway ◽  
Stimuli Responsive ◽  
Spin Configuration ◽  
De Broglie Waves ◽  
Filtering Efficiency ◽  
External Stimuli ◽  
Spin Filtering

<div>The development of stimuli responsive systems that can switch between two distinct spin states under the application of an external stimuli has always remained an illusory challenge. Here, we report a stimuli-based spin filter by utilizing photo-responsive endoperoxide (EPO) based single molecule device. The photo-irradiation on EPO triggers the homolytic cleavage of the peroxide O-O bond generating diradical intermediate centered on two O-atoms which facilitates high spin filtering efficiency when placed between gold electrodes. The broken conjugated scenario due to peroxide bridge of EPO hinders the propagation of de-Broglie waves across the molecular skeleton. While the diradical intermediate of EPO yields high conductance for one of the spin configuration. The transmission characteristics of various photoproducts along the photochemical reaction pathway of EPO are also investigated using density functional theory in combination with non-equilibrium Green’s function (NEGF-DFT) technique. We demonstrate the key role played by Quantum Interference (QI) effects in dramatic modulation of conductance arising due to different degree of conjugation along the reaction pathway of EPO.</div><div><br></div>

scholarly journals Quantum Interference and Spin Filtering Effects in Photo-responsive Endoperoxide Based Single Molecular Device

2021 ◽  
Author(s):  
Ashima Bajaj ◽  
Rishu Khurana ◽  
Md. Ehesan Ali
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Density Functional ◽  
Reaction Pathway ◽  
Stimuli Responsive ◽  
Spin Configuration ◽  
De Broglie Waves ◽  
Filtering Efficiency ◽  
External Stimuli ◽  
Spin Filtering

<div>The development of stimuli responsive systems that can switch between two distinct spin states under the application of an external stimuli has always remained an illusory challenge. Here, we report a stimuli-based spin filter by utilizing photo-responsive endoperoxide (EPO) based single molecule device. The photo-irradiation on EPO triggers the homolytic cleavage of the peroxide O-O bond generating diradical intermediate centered on two O-atoms which facilitates high spin filtering efficiency when placed between gold electrodes. The broken conjugated scenario due to peroxide bridge of EPO hinders the propagation of de-Broglie waves across the molecular skeleton. While the diradical intermediate of EPO yields high conductance for one of the spin configuration. The transmission characteristics of various photoproducts along the photochemical reaction pathway of EPO are also investigated using density functional theory in combination with non-equilibrium Green’s function (NEGF-DFT) technique. We demonstrate the key role played by Quantum Interference (QI) effects in dramatic modulation of conductance arising due to different degree of conjugation along the reaction pathway of EPO.</div><div><br></div>

scholarly journals External-stimuli responsive systems for cancer theranostic

2016 ◽  
Vol 11 (5) ◽  
pp. 585-595 ◽  
Author(s):  
Jianhui Yao ◽  
Jingxian Feng ◽  
Jun Chen
Keyword(s):  
Stimuli Responsive ◽  
Responsive Systems ◽  
External Stimuli

Smart Polymers and their Applications: A Review

2017 ◽  
Vol 8 (03) ◽  
Author(s):  
Gore S. A. ◽  
Gholve S. B. ◽  
Savalsure S. M. ◽  
Ghodake K. B. ◽  
Bhusnure O. G. ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Water Soluble ◽  
Solution Temperature ◽  
Smart Polymers ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Water Soluble Polymers ◽  
Commercial Applications ◽  
Stimuli Sensitive ◽  
External Stimuli

Smart polymers are materials that respond to small external stimuli. These are also referred as stimuli responsive materials or intelligent materials. Smart polymers that can exhibit stimuli-sensitive properties are becoming important in many commercial applications. These polymers can change shape, strength and pore size based on external factors such as temperature, pH and stress. The stimuli include salt, UV irradiation, temperature, pH, magnetic or electric field, ionic factors etc. Smart polymers are very promising applicants in drug delivery, tissue engineering, cell culture, gene carriers, textile engineering, oil recovery, radioactive wastage and protein purification. The study is focused on the entire features of smart polymers and their most recent and relevant applications. Water soluble polymers with tunable lower critical solution temperature (LCST) are of increasing interest for biological applications such as cell patterning, smart drug release, DNA sequencing etc.

scholarly journals Dynamic Manipulation of THz Waves Enabled by Phase-Transition VO2 Thin Film

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 114
Author(s):  
Chang Lu ◽  
Qingjian Lu ◽  
Min Gao ◽  
Yuan Lin
Keyword(s):  
Optical Methods ◽  
Stimuli Responsive ◽  
Device Structure ◽  
Current State ◽  
Insulator Metal Transition ◽  
Potential Applications ◽  
Fs Laser ◽  
External Stimuli ◽  
Thz Applications ◽  
Thz Waves

The reversible and multi-stimuli responsive insulator-metal transition of VO2, which enables dynamic modulation over the terahertz (THz) regime, has attracted plenty of attention for its potential applications in versatile active THz devices. Moreover, the investigation into the growth mechanism of VO2 films has led to improved film processing, more capable modulation and enhanced device compatibility into diverse THz applications. THz devices with VO2 as the key components exhibit remarkable response to external stimuli, which is not only applicable in THz modulators but also in rewritable optical memories by virtue of the intrinsic hysteresis behaviour of VO2. Depending on the predesigned device structure, the insulator-metal transition (IMT) of VO2 component can be controlled through thermal, electrical or optical methods. Recent research has paid special attention to the ultrafast modulation phenomenon observed in the photoinduced IMT, enabled by an intense femtosecond laser (fs laser) which supports “quasi-simultaneous” IMT within 1 ps. This progress report reviews the current state of the field, focusing on the material nature that gives rise to the modulation-allowed IMT for THz applications. An overview is presented of numerous IMT stimuli approaches with special emphasis on the underlying physical mechanisms. Subsequently, active manipulation of THz waves through pure VO2 film and VO2 hybrid metamaterials is surveyed, highlighting that VO2 can provide active modulation for a wide variety of applications. Finally, the common characteristics and future development directions of VO2-based tuneable THz devices are discussed.

scholarly journals Metal-Organic Framework-Based Stimuli-Responsive Polymers

2021 ◽  
Vol 5 (4) ◽  
pp. 101
Author(s):  
Menglian Wei ◽  
Yu Wan ◽  
Xueji Zhang
Keyword(s):  
Metal Organic Framework ◽  
Chemical Properties ◽  
Stimuli Responsive ◽  
Guest Molecules ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Reversible Phase Transition ◽  
Metal Organic ◽  
External Stimuli ◽  
Organic Framework

Metal-organic framework (MOF) based stimuli-responsive polymers (coordination polymers) exhibit reversible phase-transition behavior and demonstrate attractive properties that are capable of altering physical and/or chemical properties upon exposure to external stimuli, including pH, temperature, ions, etc., in a dynamic fashion. Thus, their conformational change can be imitated by the adsorption/desorption of target analytes (guest molecules), temperature or pressure changes, and electromagnetic field manipulation. MOF-based stimuli responsive polymers have received great attention due to their advanced optical properties and variety of applications. Herein, we summarized some recent progress on MOF-based stimuli-responsive polymers (SRPs) classified by physical and chemical responsiveness, including temperature, pressure, electricity, pH, metal ions, gases, alcohol and multi-targets.

External Stimuli-Responsive Nanoparticles for Spatially and Temporary Controlled Delivery of CRISPR-Cas Genome Editors

2021 ◽  
Author(s):  
Ruosen Xie ◽  
Yuyuan Wang ◽  
Shaoqin Gong
Keyword(s):  
Genome Editing ◽  
Genetic Diseases ◽  
Delivery Systems ◽  
Controlled Delivery ◽  
Stimuli Responsive ◽  
New Therapies ◽  
External Stimuli

The CRISPR–Cas9 system is a powerful tool for genome editing, which can potentially lead to new therapies for genetic diseases. Up to date, various viral and non-viral delivery systems have...

A polycation-induced secondary assembly of amphiphilic calixarene and its multi-stimuli responsive gelation behavior

2015 ◽  
Vol 51 (9) ◽  
pp. 1647-1649 ◽  
Author(s):  
Kun-Peng Wang ◽  
Yong Chen ◽  
Yu Liu
Keyword(s):  
Stimuli Responsive ◽  
Supramolecular Hydrogel ◽  
Assembly Strategy ◽  
Gelation Behavior ◽  
External Stimuli ◽  
Secondary Assembly

A calixarene-based supramolecular hydrogel with reversible or irreversible gelation behaviors in response to external stimuli constructed via a hierarchical induced assembly strategy.

scholarly journals Molecularly engineered switchable photo-responsive membrane in gas separation for environmental protection

2019 ◽  
Vol 25 (4) ◽  
pp. 447-461 ◽  
Author(s):  
Aishah Rosli ◽  
Siew Chun Low
Keyword(s):  
Environmental Protection ◽  
Gas Separation ◽  
Energy Costs ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Separation Systems ◽  
Non Invasive ◽  
Responsive Membranes ◽  
External Stimuli

In recent years, stimuli-responsive materials have garnered interest due to their ability to change properties when exposed to external stimuli, making it useful for various applications including gas separation. Light is a very attractive trigger for responsive materials due to its speedy and non-invasive nature as well as the potential to reduce energy costs significantly. Even though light is deemed as an appealing stimulus for the development of stimuli-responsive materials, this avenue has yet to be extensively researched, as evidenced by the fewer works done on the photo-responsive membranes. Of these, there are even less research done on photo-responsive materials for the purpose of gas separation, thus, we have collected the examples that answer both these criteria in this review. This review covers the utilisation of photo-responsive materials specifically for gas separation purposes. Photo-chromic units, their integration into gas separation systems, mechanism and research that have been done on the topic so far are discussed.

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