Dynamic surface-assisted assembly behaviours mediated by external stimuli

Soft Matter ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Xuan Peng ◽  
Fengying Zhao ◽  
Yang Peng ◽  
Jing Li ◽  
Qingdao Zeng
Keyword(s):  
Electric Field ◽  
Irradiation Temperature ◽  
Light Irradiation ◽  
Dynamic Surface ◽  
Guest Species ◽  
External Stimuli

In this review, STM investigations reveal that surface-assisted assembly nanostructures can be well mediated by external stimuli, including guest species, light irradiation, temperature and electric field.

scholarly journals Switching Between Enantiomers by Combining Chromoselective Photocatalysis and Biocatalysis

2021 ◽  
Author(s):  
Luca Schmermund ◽  
Susanne Reischauer ◽  
Sarah Bierbaumer ◽  
Christoph Winkler ◽  
Alba Diaz-Rodriguez ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Green Light ◽  
Light Irradiation ◽  
Thermal Processes ◽  
Rhodococcus Ruber ◽  
Oxidation Potentials ◽  
Enzymatic Cascades ◽  
Electron Holes ◽  
External Stimuli ◽  
Generate Electron

<a></a><a></a><a></a><a></a><a></a><a>Controlling the selectivity of a chemical reaction with external stimuli is common in thermal processes, but rare in visible-light photocatalysis. Here we show that the redox potential of a carbon nitride photocatalyst (CN-OA-m) can be tuned by changing the irradiation wavelength to generate electron holes with different oxidation potentials. This tuning was the key to realizing photo-chemo-enzymatic cascades that give either the (<i>S</i>)- or the (<i>R</i>)-enantiomer of phenylethanol. In combination with an unspecific peroxygenase from <i>Agrocybe aegerita,</i> green light irradiation of CN-OA-m led to the enantioselective hydroxylation of ethylbenzene to (<i>R</i>)-1-phenylethanol (99% <i>ee</i>). In contrast, blue light irradiation triggered the photocatalytic oxidation of ethylbenzene to acetophenone, which in turn was enantioselectively reduced with an alcohol dehydrogenase from <i>Rhodococcus ruber </i>to form<i> </i>(<i>S</i>)-1-phenylethanol (93% <i>ee</i>).</a><a></a>

Light-deformable dynamic surface fabricated by ink-jet printing

Soft Matter ◽  
2021 ◽  
Author(s):  
Sunqian Liu ◽  
Xiaoling Liao ◽  
Laurens T. de Haan ◽  
Yuxin You ◽  
Huapeng Ye ◽  
...  
Keyword(s):  
Dynamic Surface ◽  
Ink Jet Printing ◽  
Ink Jet ◽  
Dynamic Surfaces ◽  
Jet Printing ◽  
External Stimuli ◽  
Application Prospects

Dynamic surfaces which can change their topography with external stimuli have wide application prospects.

pH-Controlled photocatalytic abatement of RhB by an FeWO4/BiPO4 p–n heterojunction under visible light irradiation

2019 ◽  
Vol 43 (44) ◽  
pp. 17241-17250
Author(s):  
Nithya Mahendran ◽  
Sathya Udayakumar ◽  
Keerthi Praveen
Keyword(s):  
Electric Field ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Separation Efficiency ◽  
Light Irradiation ◽  
The Novel ◽  
Electron Hole ◽  
Ph Controlled

The novel FeWO4/BiPO4 heterojunction generates an inner electric field to promote electron–hole separation efficiency and is a proficient photocatalyst.

EFFECT OF LIGHT IRRADIATION ON ELECTRIC-FIELD-INDUCED RESISTANCE SWITCHING PHENOMENON IN PLANAR VO2/c-Al2O3 STRUCTURE

2009 ◽  
Vol 08 (01n02) ◽  
pp. 147-150 ◽  
Author(s):  
NURUL EZREENA MOHAMAD ◽  
KUNIO OKIMURA ◽  
JOE SAKAI
Keyword(s):  
Electric Field ◽  
Induced Resistance ◽  
Applied Voltage ◽  
Resistance Switching ◽  
Light Irradiation ◽  
Switching Phenomenon ◽  
Current Voltage ◽  
Jump Phenomena ◽  
Current Voltage Characteristics ◽  
Effect Of Light

A simple device of VO 2 film with two terminal electrodes revealed current jump phenomena at certain applied voltage. In this study, we investigated the effect of light irradiation on the electric field-induced resistance switching phenomenon. Based on changes of current–voltage characteristics under light irradiation, we discussed the effect of light irradiation on this device.

scholarly journals TiO2/Fe2O3 heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

RSC Advances ◽  
2019 ◽  
Vol 9 (39) ◽  
pp. 22764-22771 ◽  
Author(s):  
Qiufeng Mei ◽  
Feiyan Zhang ◽  
Ning Wang ◽  
Yun Yang ◽  
Ronglan Wu ◽  
...  
Keyword(s):  
Electric Field ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Reduction ◽  
Light Irradiation ◽  
Internal Electric Field ◽  
Reduction Efficiency

A TiO2/Fe2O3 heterojunction with an internal electric field was constructed for enhancing photocatalytic reduction efficiency of Cr(vi).

Photocatalytic CO 2 reduction over B 4 C/C 3 N 4 with internal electric field under visible light irradiation

2016 ◽  
Vol 464 ◽  
pp. 89-95 ◽  
Author(s):  
Xiaojie Zhang ◽  
Lei Wang ◽  
Quanchao Du ◽  
Zhiyong Wang ◽  
Shuguo Ma ◽  
...  
Keyword(s):  
Electric Field ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Internal Electric Field

scholarly journals Twistable Dipolar Aryl Rings as Electric Field Actuated Conformational Molecular Switches

2020 ◽  
Author(s):  
Kílian Jutglar Lozano ◽  
Raul Santiago ◽  
Jordi Ribas ◽  
Stefan Bromley
Keyword(s):  
Electric Field ◽  
Dihedral Angle ◽  
Electronic Device ◽  
Molecular System ◽  
Rapid Change ◽  
Molecular Switches ◽  
Organic Chemical ◽  
Chemical Systems ◽  
Dipolar System ◽  
External Stimuli

The ability to control the chemical conformation of a system via external stimuli is a promsing route for developing molecular switches. For eventual deployment as viable sub-nanoscale components that are compatible with current electronic device technology, conformational switching should controllable by a local electric field (i.e. E-field gateable) and accompanied by a rapid change in conduction. In organic chemical systems the degree of π-conjugation is linked to the degree of electronic delocalisation, and thus largely determines the conductivity. Here, by means of accurate first principles calculations, we study the prototypical biphenyl based molecular system in which the dihedral angle between the two rings determines the degree of conjugation. In order to make this a gateable system we create a net dipole by asymmetrically functionalising one ring with electronegative substituents (F, Br and CN) with different polarisabilities. In this way, the application of an E-field interacts with the dipolar system to influence the dihedral angle, thus controlling the conjugation. For all three considered substituents we consider a range of E-fields, and in each case extract conformational energy profiles. Using this data we obtain the minimum E-field required to induce a barrierless switching event for each system. We further extract the estimated switching speeds, the conformational probabliities at finite temperatures, and the effect of applied E-field on electronic structure. Consideration of these data allow us to assess which factors are most important in the design of efficient gateable electrical molecular switches.

scholarly journals Superelasticity of a photo-actuating chiral salicylideneamine crystal

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Takuya Taniguchi ◽  
Kazuki Ishizaki ◽  
Daisuke Takagi ◽  
Kazuki Nishimura ◽  
Hiroki Shigemune ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
External Force ◽  
Molecular Crystal ◽  
Light Irradiation ◽  
Elastic Response ◽  
Layer Model ◽  
Induced Stress ◽  
External Stimuli

AbstractSuperelasticity is a type of elastic response to an applied external force, caused by a phase transformation. Actuation of materials is also an elastic response to external stimuli such as light and heat. Although both superelasticity and actuation are deformations resulting from stimulus-induced stress, there is a phenomenological difference between the two with respect to whether force is an input or an output. Here, we report that a molecular crystal manifests superelasticity during photo-actuation under light irradiation. The crystal exhibits stepwise twisted actuation due to two effects, photoisomerization and photo-triggered phase transition, and the actuation behavior is simulated based on a dynamic multi-layer model. The simulation, in turn, reveals how the photoisomerization and phase transition progress in the crystal, indicating superelasticity induced by modest stress due to the formation of photoproducts. This work provides not only a successful simulation of stepwise twisted actuation, but also to the best of our knowledge the first indication of superelasticity induced by light.

Variations in the photoconductivity and in the electrical counting properties of diamonds

1956 ◽  
Vol 234 (1198) ◽  
pp. 419-432 ◽  
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
Hall Effect ◽  
Temperature Effects ◽  
Room Temperature ◽  
Red Light ◽  
Quantitative Relationship ◽  
Charge Carriers ◽  
Light Irradiation ◽  
Hall Effect Measurements

The electrical conductivity produced by β -ray bombardment and by light irradiation in several diamonds was investigated in the temperature range 150 to 500° K. Considerable uniformity was observed in the behaviour of the specimens; all of them polarized strongly in the dark at room temperature, and polarization could be effectively eliminated by pulsing the electric field while maintaining the β -flux. Both the counting response and the photoconductivity increased as the temperature was lowered. This was interpreted as being largely due to an increase in the mobility of the charge carriers at lower temperatures, the quantitative relationship being consistent with Hall effect measurements. Accumulation of polarization was reduced by irradiation with red light or by elevation of temperature; at 420° K little sign of polarization remained. From various temperature effects, the thermal depths of the trapping levels in these diamonds were estimated at 0⋅6, 0⋅8 and 1 eV.

scholarly journals Switching Between Enantiomers by Combining Chromoselective Photocatalysis and Biocatalysis

2021 ◽  
Author(s):  
Luca Schmermund ◽  
Susanne Reischauer ◽  
Sarah Bierbaumer ◽  
Christoph Winkler ◽  
Alba Diaz-Rodriguez ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Green Light ◽  
Light Irradiation ◽  
Thermal Processes ◽  
Rhodococcus Ruber ◽  
Oxidation Potentials ◽  
Enzymatic Cascades ◽  
Electron Holes ◽  
External Stimuli ◽  
Generate Electron

<a></a><a></a><a></a><a></a><a></a><a>Controlling the selectivity of a chemical reaction with external stimuli is common in thermal processes, but rare in visible-light photocatalysis. Here we show that the redox potential of a carbon nitride photocatalyst (CN-OA-m) can be tuned by changing the irradiation wavelength to generate electron holes with different oxidation potentials. This tuning was the key to realizing photo-chemo-enzymatic cascades that give either the (<i>S</i>)- or the (<i>R</i>)-enantiomer of phenylethanol. In combination with an unspecific peroxygenase from <i>Agrocybe aegerita,</i> green light irradiation of CN-OA-m led to the enantioselective hydroxylation of ethylbenzene to (<i>R</i>)-1-phenylethanol (99% <i>ee</i>). In contrast, blue light irradiation triggered the photocatalytic oxidation of ethylbenzene to acetophenone, which in turn was enantioselectively reduced with an alcohol dehydrogenase from <i>Rhodococcus ruber </i>to form<i> </i>(<i>S</i>)-1-phenylethanol (93% <i>ee</i>).</a><a></a>

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