Lian Shoute - Academia.edu (original) (raw)

Papers by Lian Shoute

Biosensors and Bioelectronics

The Journal of Physical Chemistry, 1993

Kinetics and Absorption Spectra of Transients in the Radiolysis of Hexafluorobenzene in Aqueous S... more Kinetics and Absorption Spectra of Transients in the Radiolysis of Hexafluorobenzene in Aqueous Solution: A Pulse Radiolysis Study ... Lian C. T. Shoute' and Jai P. Mittal' Chemistry Division, Bhabha Atomic Research Centre, Bombay 400 085, India Received: July 22. 1992; In ...

Spectrochimica Acta Part A: Molecular Spectroscopy, 1989

Chemical Physics Letters, 2001

ABSTRACT Supersonically expanded 9-cyanoanthracene (9CNA) and its van der Waals complexes with xe... more ABSTRACT Supersonically expanded 9-cyanoanthracene (9CNA) and its van der Waals complexes with xenon have been examined by laser-induced fluorescence excitation spectroscopy. Previously unassigned vibronic features in the spectrum of the bare molecule have been assigned. Measurements of the relative intensities of corresponding vibronic features in the corrected spectra of 9CNA and its 1:1 complex with Xe are used to calculate the quantum yields of fluorescence arising from single vibronic levels at energies in the range 0

The Journal of Physical Chemistry, 1994

Hydrated electron reacts with fluoranil (tetrafluoro-l, 4-benzoquinone) with a rate constant of 2... more Hydrated electron reacts with fluoranil (tetrafluoro-l, 4-benzoquinone) with a rate constant of 2.5 x 1O'O M-'s-'to yield fluoranil anion. The kinetics of the reaction was monitored at 300 and at 700 nm for the anion and eaq-, respectively. The buildup of the anion absorption ...

The Journal of chemical physics, 2002

Excited-state dynamics of alizarin-sensitized TiO nanoparticles from resonance Raman spectroscopy... more Excited-state dynamics of alizarin-sensitized TiO nanoparticles from resonance Raman spectroscopy. [The Journal of Chemical Physics 117, 842 (2002)]. Lian CT Shoute, Glen R. Loppnow. Abstract. ... Lattice dynamics. Phonons in crystal lattices. Body. I. INTRODUCTION. ...

The Journal of Physical Chemistry, 1996

... Phys. Chem. 1972, 4, 311. [ChemPort]. (15) Sehested, K.; Corfitzen, H.; Christensen, HC; Hart... more ... Phys. Chem. 1972, 4, 311. [ChemPort]. (15) Sehested, K.; Corfitzen, H.; Christensen, HC; Hart, EJ J. Phys. Chem. ... Kareem AH Chehade, Katarzyna Kiegiel, Richard J. Isaacs, Jennifer S. Pickett, Katherine E. Bowers, Carol A. Fierke, Douglas A. Andres, and H. Peter Spielmann. ...

ACS Omega

In this study, we present a microdevice for the capture and quantification of Sclerotinia sclerot... more In this study, we present a microdevice for the capture and quantification of Sclerotinia sclerotiorum spores, pathogenic agents of one of the most harmful infectious diseases of crops, Sclerotinia stem rot. The early prognosis of an outbreak is critical to avoid severe economic losses and can be achieved by the detection of a small number of airborne spores. However, the current lack of simple and effective methods to quantify fungal airborne pathogens has hindered the development of an accurate early warning system. We developed a device that remedies these limitations based on a microfluidic design that contains a nanothick aluminum electrode structure integrated with a picoliter well array for dielectrophoresis-driven capture of spores and on-chip quantitative detection employing impedimetric sensing. Based on experimental results, we demonstrated a highly efficient spore trapping rate of more than 90% with an effective impedimetric sensing method that allowed the spore quantification of each column in the array and achieved a sensitivity of 2%/spore at 5 kHz and 1.6%/ spore at 20 kHz, enabling single spore detection. We envision that our device will contribute to the development of a low-cost microfluidic platform that could be integrated into an infectious plant disease forecasting tool for crop protection.

The Journal of …, 1993

Charge-transfer complexes of bromine atoms with haloalkanes and alkanes were produced by pulse ra... more Charge-transfer complexes of bromine atoms with haloalkanes and alkanes were produced by pulse radiolysis and by laser-flash photolysis in various organic solvents. Br atoms were produced by photolysis of Br, (at 351 or 248 nm), by photolysis of bromoalkanes (at 248 nm), or by ...

The availability of robust superhydrophobic materials with the ability to withstand harsh environ... more The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO2 nanotube arrays (TNTAs) and investigated the resilience of the materials when they are subjected to harsh conditions such as intense cavitation upon ultrasonication, corrosion in saline water, water-jet impact, and abrasion. The TNTAs were prepared by anodization of Ti foil in buffered aqueous electrolyte containing fluoride ions. The hydrophilic TNTAs were functionalized with octadecylphosphonic acid (ODPA) or 1H, 1H′, 2H, 2H′-perfluorodecyl phosphonic acid (PFDPA) to form a self-assembled monolayer on the TNTA surface to produce superhydrophobic ODPA@TNTA or PFDPA@TNTA surfaces. The superhydrophobic ODPA@TNTA and PFDPA@TNTA have contact angles of 156.0° ± 1.5° and 168° ± 1.5°, and contact angle hysteresis of 3.0° and 0.8°, respectively. The ...

Cheminform, 2010

Formation of Radical Anions on the Reduction of Carbonyl-Containing Perfluoroaromatic Compounds i... more Formation of Radical Anions on the Reduction of Carbonyl-Containing Perfluoroaromatic Compounds in Aqueous Solution: A Pulse Radiolysis Study.-In comparison with pentafluorophenyl derivatives (I) the rate of fluoride elimination from radical anions of pentafluorophenylcarbonyl compounds (II) is reduced. This leads to a significant increase in lifetime of these radical anions.-(SHOUTE, L.

… and Instrumentation. Part C. Radiation Physics …, 1986

Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-tr... more Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-trifluoroacetone (BTA) are stabilized at 77 K and studied by their absorption spectra in the glassy matrices of isopropyl alcohol and methanol-11 mol % HzO. The transients identified are BTAd-,I, BTA&, BTAH&, [BTA&&.lunrrlu, and [BT&,&Jn~. BT%-,I isomer&s to BTA&,, apparently suggesting that anion radical formation stabiis the keto form. BTA&,.,, undergoes configurational relaxation from an initially unstable to a final stable relaxed co&uration. Both BTA&, and BTA&,, react with protons produced on y radiolysis to give BTAH&.

Chemical physics letters, 1992

... Effects of specific and nonspecific interaction on the formation of twisted intramolecular ch... more ... Effects of specific and nonspecific interaction on the formation of twisted intramolecular charge transfer Lian CT Shoute Chemistry Division, Bhabha Atomic Research ... M. Gordon and WR Ware (Academic Press, New York, 1975) p. 187; RJ Visser and CAGO Varma, J. Chem. ...

Applied Spectroscopy, 2009

This paper presents results showing that the design of substrates used for surface-enhanced Raman... more This paper presents results showing that the design of substrates used for surface-enhanced Raman spectroscopy (SERS) can impact the apparent enhancement factors (EFs) obtained due to optical interference effects that are distinct from SERS, providing additional enhancement of the Raman intensity. Thus, a combination of SERS and a substrate designed to maximize interference-based enhancement is demonstrated to give additional Raman intensity above that observed for SERS alone. The system explored is 4-nitroazobenzene (NAB) and biphenyl (BP) chemisorbed on a nanostructured silver film obtained by vacuum deposition of Ag on thermally oxidized silicon wafers. The enhancing silver layer is partially transparent, enabling a standing wave to form as a result of the combination of the incident light and light reflected from the underlying Si substrate (i.e., light that passes through the Ag and the intervening dielectric layer of SiO x). The Raman intensity is measured as a function of the thickness of the thermal oxide layer in the range from ;150 to ;400 nm, and despite a lack of morphological variation in the silver films, there is a strong dependence of the Raman intensity on the oxide thickness. The Raman signal for the optimal SiO x interlayer thickness is 38 times higher than the intensity obtained when the Ag particles are deposited directly onto Si (with native oxide). To account for the trends observed in the Raman intensity versus thickness data, calculations of the relative mean square electric field (MSEF) at the surface of the SiO x are carried out. These calculations are also used to further optimize the experimental setup.

The Journal of Physical Chemistry, 1996

Hydrated electrons and hydrogen atoms react with pentafluorophenol (PFP) to result in fluoride io... more Hydrated electrons and hydrogen atoms react with pentafluorophenol (PFP) to result in fluoride ion elimination and subsequent production of the tetrafluorophenoxyl radical. Evidence for the formation of this radical was obtained from its reaction with ascorbate, which is oxidized ...

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-tr... more Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-trifluoroacetone (BTA) are stabilized at 77 K and studied by their absorption spectra in the glassy matrices of isopropyl alcohol and methanol-11 mol % HzO. The transients identified are BTAd-,I, BTA&, BTAH&, [BTA&&.lunrrlu, and [BT&,&Jn~. BT%-,I isomer&s to BTA&,, apparently suggesting that anion radical formation stabiis the keto form. BTA&,.,, undergoes configurational relaxation from an initially unstable to a final stable relaxed co&uration. Both BTA&, and BTA&,, react with protons produced on y radiolysis to give BTAH&.

Applied Surface Science

Fouling of solid surfaces is a ubiquitous problem in industrial processes. As unwanted material a... more Fouling of solid surfaces is a ubiquitous problem in industrial processes. As unwanted material accumulates on components, their function is impaired and costly repairs are required. Most fouling occurs from impurities present in water that are deposited when the water contacts a solid surface. It follows that if the adhesive forces at the water-solid interface are minimized, less fouling will result. In this study, we present a novel method to minimize fouling by fabricating a hydrophobic surface based upon self-assembled monolayer (SAM)-modified titanium dioxide nanotube arrays (TNTAs). We demonstrate a direct correlation between hydrophobicity and the formation of scale from dissolved salts by comparison of the surface's static contact angle and degree of precipitation deposition. Furthermore, by tailoring the surface hydrophobicity through employment of a wide variety of SAMs with different alkyl chain lengths, we determine the threshold level of hydrophobicity that inhibits fouling in the SAM-TNTA system; surfaces with a static contact angle greater than 144° display vastly increased fouling resistance. The surface morphology, surface composition, and stability of the alkyl phosphonic acid-and perfluoroalkyl phosphonic acid-SAM-TNTAs were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and diffuse reflectance infrared Fourier transform spec-troscopy (DRIFTS).

Nanomaterials (Basel, Switzerland), Jan 2, 2018

The availability of robust superhydrophobic materials with the ability to withstand harsh environ... more The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO₂ nanotube arrays (TNTAs) and investigated the resilience of the materials when they are subjected to harsh conditions such as intense cavitation upon ultrasonication, corrosion in saline water, water-jet impact, and abrasion. The TNTAs were prepared by anodization of Ti foil in buffered aqueous electrolyte containing fluoride ions. The hydrophilic TNTAs were functionalized with octadecylphosphonic acid (ODPA) or 1H, 1H', 2H, 2H'-perfluorodecyl phosphonic acid (PFDPA) to form a self-assembled monolayer on the TNTA surface to produce superhydrophobic ODPA@TNTA or PFDPA@TNTA surfaces. The superhydrophobic ODPA@TNTA and PFDPA@TNTA have contact angles of 156.0° ± 1.5° and 168° ± 1.5°, and contact angle hysteresis of 3.0° and 0.8°, respective...

Biosensors and Bioelectronics

The Journal of Physical Chemistry, 1993

Kinetics and Absorption Spectra of Transients in the Radiolysis of Hexafluorobenzene in Aqueous S... more Kinetics and Absorption Spectra of Transients in the Radiolysis of Hexafluorobenzene in Aqueous Solution: A Pulse Radiolysis Study ... Lian C. T. Shoute' and Jai P. Mittal' Chemistry Division, Bhabha Atomic Research Centre, Bombay 400 085, India Received: July 22. 1992; In ...

Spectrochimica Acta Part A: Molecular Spectroscopy, 1989

Chemical Physics Letters, 2001

ABSTRACT Supersonically expanded 9-cyanoanthracene (9CNA) and its van der Waals complexes with xe... more ABSTRACT Supersonically expanded 9-cyanoanthracene (9CNA) and its van der Waals complexes with xenon have been examined by laser-induced fluorescence excitation spectroscopy. Previously unassigned vibronic features in the spectrum of the bare molecule have been assigned. Measurements of the relative intensities of corresponding vibronic features in the corrected spectra of 9CNA and its 1:1 complex with Xe are used to calculate the quantum yields of fluorescence arising from single vibronic levels at energies in the range 0

The Journal of Physical Chemistry, 1994

Hydrated electron reacts with fluoranil (tetrafluoro-l, 4-benzoquinone) with a rate constant of 2... more Hydrated electron reacts with fluoranil (tetrafluoro-l, 4-benzoquinone) with a rate constant of 2.5 x 1O'O M-'s-'to yield fluoranil anion. The kinetics of the reaction was monitored at 300 and at 700 nm for the anion and eaq-, respectively. The buildup of the anion absorption ...

The Journal of chemical physics, 2002

Excited-state dynamics of alizarin-sensitized TiO nanoparticles from resonance Raman spectroscopy... more Excited-state dynamics of alizarin-sensitized TiO nanoparticles from resonance Raman spectroscopy. [The Journal of Chemical Physics 117, 842 (2002)]. Lian CT Shoute, Glen R. Loppnow. Abstract. ... Lattice dynamics. Phonons in crystal lattices. Body. I. INTRODUCTION. ...

The Journal of Physical Chemistry, 1996

... Phys. Chem. 1972, 4, 311. [ChemPort]. (15) Sehested, K.; Corfitzen, H.; Christensen, HC; Hart... more ... Phys. Chem. 1972, 4, 311. [ChemPort]. (15) Sehested, K.; Corfitzen, H.; Christensen, HC; Hart, EJ J. Phys. Chem. ... Kareem AH Chehade, Katarzyna Kiegiel, Richard J. Isaacs, Jennifer S. Pickett, Katherine E. Bowers, Carol A. Fierke, Douglas A. Andres, and H. Peter Spielmann. ...

ACS Omega

In this study, we present a microdevice for the capture and quantification of Sclerotinia sclerot... more In this study, we present a microdevice for the capture and quantification of Sclerotinia sclerotiorum spores, pathogenic agents of one of the most harmful infectious diseases of crops, Sclerotinia stem rot. The early prognosis of an outbreak is critical to avoid severe economic losses and can be achieved by the detection of a small number of airborne spores. However, the current lack of simple and effective methods to quantify fungal airborne pathogens has hindered the development of an accurate early warning system. We developed a device that remedies these limitations based on a microfluidic design that contains a nanothick aluminum electrode structure integrated with a picoliter well array for dielectrophoresis-driven capture of spores and on-chip quantitative detection employing impedimetric sensing. Based on experimental results, we demonstrated a highly efficient spore trapping rate of more than 90% with an effective impedimetric sensing method that allowed the spore quantification of each column in the array and achieved a sensitivity of 2%/spore at 5 kHz and 1.6%/ spore at 20 kHz, enabling single spore detection. We envision that our device will contribute to the development of a low-cost microfluidic platform that could be integrated into an infectious plant disease forecasting tool for crop protection.

The Journal of …, 1993

Charge-transfer complexes of bromine atoms with haloalkanes and alkanes were produced by pulse ra... more Charge-transfer complexes of bromine atoms with haloalkanes and alkanes were produced by pulse radiolysis and by laser-flash photolysis in various organic solvents. Br atoms were produced by photolysis of Br, (at 351 or 248 nm), by photolysis of bromoalkanes (at 248 nm), or by ...

The availability of robust superhydrophobic materials with the ability to withstand harsh environ... more The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO2 nanotube arrays (TNTAs) and investigated the resilience of the materials when they are subjected to harsh conditions such as intense cavitation upon ultrasonication, corrosion in saline water, water-jet impact, and abrasion. The TNTAs were prepared by anodization of Ti foil in buffered aqueous electrolyte containing fluoride ions. The hydrophilic TNTAs were functionalized with octadecylphosphonic acid (ODPA) or 1H, 1H′, 2H, 2H′-perfluorodecyl phosphonic acid (PFDPA) to form a self-assembled monolayer on the TNTA surface to produce superhydrophobic ODPA@TNTA or PFDPA@TNTA surfaces. The superhydrophobic ODPA@TNTA and PFDPA@TNTA have contact angles of 156.0° ± 1.5° and 168° ± 1.5°, and contact angle hysteresis of 3.0° and 0.8°, respectively. The ...

Cheminform, 2010

Formation of Radical Anions on the Reduction of Carbonyl-Containing Perfluoroaromatic Compounds i... more Formation of Radical Anions on the Reduction of Carbonyl-Containing Perfluoroaromatic Compounds in Aqueous Solution: A Pulse Radiolysis Study.-In comparison with pentafluorophenyl derivatives (I) the rate of fluoride elimination from radical anions of pentafluorophenylcarbonyl compounds (II) is reduced. This leads to a significant increase in lifetime of these radical anions.-(SHOUTE, L.

… and Instrumentation. Part C. Radiation Physics …, 1986

Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-tr... more Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-trifluoroacetone (BTA) are stabilized at 77 K and studied by their absorption spectra in the glassy matrices of isopropyl alcohol and methanol-11 mol % HzO. The transients identified are BTAd-,I, BTA&, BTAH&, [BTA&&.lunrrlu, and [BT&,&Jn~. BT%-,I isomer&s to BTA&,, apparently suggesting that anion radical formation stabiis the keto form. BTA&,.,, undergoes configurational relaxation from an initially unstable to a final stable relaxed co&uration. Both BTA&, and BTA&,, react with protons produced on y radiolysis to give BTAH&.

Chemical physics letters, 1992

... Effects of specific and nonspecific interaction on the formation of twisted intramolecular ch... more ... Effects of specific and nonspecific interaction on the formation of twisted intramolecular charge transfer Lian CT Shoute Chemistry Division, Bhabha Atomic Research ... M. Gordon and WR Ware (Academic Press, New York, 1975) p. 187; RJ Visser and CAGO Varma, J. Chem. ...

Applied Spectroscopy, 2009

This paper presents results showing that the design of substrates used for surface-enhanced Raman... more This paper presents results showing that the design of substrates used for surface-enhanced Raman spectroscopy (SERS) can impact the apparent enhancement factors (EFs) obtained due to optical interference effects that are distinct from SERS, providing additional enhancement of the Raman intensity. Thus, a combination of SERS and a substrate designed to maximize interference-based enhancement is demonstrated to give additional Raman intensity above that observed for SERS alone. The system explored is 4-nitroazobenzene (NAB) and biphenyl (BP) chemisorbed on a nanostructured silver film obtained by vacuum deposition of Ag on thermally oxidized silicon wafers. The enhancing silver layer is partially transparent, enabling a standing wave to form as a result of the combination of the incident light and light reflected from the underlying Si substrate (i.e., light that passes through the Ag and the intervening dielectric layer of SiO x). The Raman intensity is measured as a function of the thickness of the thermal oxide layer in the range from ;150 to ;400 nm, and despite a lack of morphological variation in the silver films, there is a strong dependence of the Raman intensity on the oxide thickness. The Raman signal for the optimal SiO x interlayer thickness is 38 times higher than the intensity obtained when the Ag particles are deposited directly onto Si (with native oxide). To account for the trends observed in the Raman intensity versus thickness data, calculations of the relative mean square electric field (MSEF) at the surface of the SiO x are carried out. These calculations are also used to further optimize the experimental setup.

The Journal of Physical Chemistry, 1996

Hydrated electrons and hydrogen atoms react with pentafluorophenol (PFP) to result in fluoride io... more Hydrated electrons and hydrogen atoms react with pentafluorophenol (PFP) to result in fluoride ion elimination and subsequent production of the tetrafluorophenoxyl radical. Evidence for the formation of this radical was obtained from its reaction with ascorbate, which is oxidized ...

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-tr... more Ah&act-The transients generated in the y radiolysis of deaerated solutions of benzoyl-1 , 1, l-trifluoroacetone (BTA) are stabilized at 77 K and studied by their absorption spectra in the glassy matrices of isopropyl alcohol and methanol-11 mol % HzO. The transients identified are BTAd-,I, BTA&, BTAH&, [BTA&&.lunrrlu, and [BT&,&Jn~. BT%-,I isomer&s to BTA&,, apparently suggesting that anion radical formation stabiis the keto form. BTA&,.,, undergoes configurational relaxation from an initially unstable to a final stable relaxed co&uration. Both BTA&, and BTA&,, react with protons produced on y radiolysis to give BTAH&.

Applied Surface Science

Fouling of solid surfaces is a ubiquitous problem in industrial processes. As unwanted material a... more Fouling of solid surfaces is a ubiquitous problem in industrial processes. As unwanted material accumulates on components, their function is impaired and costly repairs are required. Most fouling occurs from impurities present in water that are deposited when the water contacts a solid surface. It follows that if the adhesive forces at the water-solid interface are minimized, less fouling will result. In this study, we present a novel method to minimize fouling by fabricating a hydrophobic surface based upon self-assembled monolayer (SAM)-modified titanium dioxide nanotube arrays (TNTAs). We demonstrate a direct correlation between hydrophobicity and the formation of scale from dissolved salts by comparison of the surface's static contact angle and degree of precipitation deposition. Furthermore, by tailoring the surface hydrophobicity through employment of a wide variety of SAMs with different alkyl chain lengths, we determine the threshold level of hydrophobicity that inhibits fouling in the SAM-TNTA system; surfaces with a static contact angle greater than 144° display vastly increased fouling resistance. The surface morphology, surface composition, and stability of the alkyl phosphonic acid-and perfluoroalkyl phosphonic acid-SAM-TNTAs were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and diffuse reflectance infrared Fourier transform spec-troscopy (DRIFTS).

Nanomaterials (Basel, Switzerland), Jan 2, 2018

The availability of robust superhydrophobic materials with the ability to withstand harsh environ... more The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO₂ nanotube arrays (TNTAs) and investigated the resilience of the materials when they are subjected to harsh conditions such as intense cavitation upon ultrasonication, corrosion in saline water, water-jet impact, and abrasion. The TNTAs were prepared by anodization of Ti foil in buffered aqueous electrolyte containing fluoride ions. The hydrophilic TNTAs were functionalized with octadecylphosphonic acid (ODPA) or 1H, 1H', 2H, 2H'-perfluorodecyl phosphonic acid (PFDPA) to form a self-assembled monolayer on the TNTA surface to produce superhydrophobic ODPA@TNTA or PFDPA@TNTA surfaces. The superhydrophobic ODPA@TNTA and PFDPA@TNTA have contact angles of 156.0° ± 1.5° and 168° ± 1.5°, and contact angle hysteresis of 3.0° and 0.8°, respective...