Search results for: Paras N. Prasad

Items from 1 to 20 out of 164 results

article

Plasticizer‐Induced Enhancement of Mesoscale Dissymmetry in Thin Films of Chiral Polymers with Variable Chain Length

Jojo P. Joseph, Trent Malone, Shema R. Abraham, Avisek Dutta, more

Conjugated polymers with chiral side chains are of interest in areas including chiral photonics, optoelectronics, and chemical and biological sensing. However, the low dissymmetry factors of most neat polymer thin films have limited their practical application. Here, a robust method to increase the absorption dissymmetry factor in a poly‐fluorene‐thiophene (PF8TS series) system is demonstrated by...

article

Stereoselective Plasmonic Interaction in Peptide‐tethered Photopolymerizable Diacetylenes Doped with Chiral Gold Nanoparticles

Jojo P. Joseph, Chirag Miglani, Antarlina Maulik, Shema R. Abraham, more

Angewandte Chemie International Edition > 62 > 37 > n/a - n/a

Designing polymeric systems with ultra‐high optical activity is instrumental in the pursuit of smart artificial chiroptical materials, including the fundamental understanding of structure/property relations. Herein, we report a diacetylene (DA) moiety flanked by chiral D‐ and L‐FF dipeptide methyl esters that exhibits efficient topochemical photopolymerization in the solid phase to furnish polydiacetylene...

article

Stereoselective Plasmonic Interaction in Peptide‐tethered Photopolymerizable Diacetylenes Doped with Chiral Gold Nanoparticles

Jojo P. Joseph, Chirag Miglani, Antarlina Maulik, Shema R. Abraham, more

Angewandte Chemie > 135 > 37 > n/a - n/a

article

Spectral Manipulation of X‐Ray Excited Optical/Persistent Luminescence by Constructing Metal–Organic Framework@Fluoride Nanoparticles Composites

Weixin Xu, Lei Lei, Yubin Wang, Paras N. Prasad, more

Laser & Photonics Reviews > 17 > 5 > n/a - n/a

Lanthanide doped fluoride nanoparticles (NPs) possess superior X‐ray excited optical luminescence (XEOL) and persistent luminescence (XEPL), which attracts great attention in many fields. Manipulating profiles of XEOL and XEPL spectra is of siginificance for new emerging applications, however, the intrinsic sharp 4f–4f transitions of trivalent lanthanide ions only generate narrow emission profiles...

article

A Regioselectively Oxidized 2D Bi/BiOx Lateral Nano‐Heterostructure for Hypoxic Photodynamic Therapy

Meng Qiu, Dou Wang, Hao Huang, Teng Yin, more

Advanced Materials > 33 > 49 > n/a - n/a

Optoelectronic science and 2D nanomaterial technologies are currently at the forefront of multidisciplinary research and have numerous applications in electronics and photonics. The unique energy and optically induced interfacial electron transfer in these nanomaterials, enabled by their relative band alignment characteristics, can provide important therapeutic modalities for healthcare. Given that...

article

Hybrid Curdlan Poly(γ ‐Glutamic Acid) Nanoassembly for Immune Modulation in Macrophage

Jeongyun Heo, Thomas A. Sobiech, Hilliard L. Kutscher, Lee Chaves, more

Macromolecular Bioscience > 21 > 1 > n/a - n/a

A nanoformulation composed of curdlan, a linear polysaccharide of 1,3‐β‐linked d‐glucose units, hydrogen bonded to poly(γ ‐glutamic acid) (PGA), was developed to stimulate macrophage. Curdlan/PGA nanoparticles (C‐NP) are formulated by physically blending curdlan (0.2 mg mL⁻¹ in 0.4 m NaOH) with PGA (0.8 mg mL⁻¹). Forster resonance energy transfer (FRET) analysis demonstrates a heterospecies interpolymer...

article

Interlayer‐Sensitized Linear and Nonlinear Photoluminescence of Quasi‐2D Hybrid Perovskites Using Aggregation‐Induced Enhanced Emission Active Organic Cation Layers

Chang‐Keun Lim, Melissa Maldonado, Robert Zalesny, Rashid Valiev, more

Advanced Functional Materials > 30 > 16 > n/a - n/a

A concept of interlayer‐sensitized photoluminescence (PL) of quasi‐2D hybrid perovskite (PVK) with a π‐conjugated optically interacting organic cation layer is introduced and demonstrated. A rod‐shaped aggregation‐induced enhanced emission (AIEE) organic cation (BPCSA+), well fitted into the lattice size of 2D PVK layers, is designed and synthesized to prolong the exciton lifetime in a condensed layer...

article

Cellular transformations in near‐infrared light‐induced apoptosis in cancer cells revealed by label‐free CARS imaging

Svitlana M. Levchenko, Andrey N. Kuzmin, Artem Pliss, Tymish Y. Ohulchanskyy, more

Journal of Biophotonics > 12 > 12 > n/a - n/a

Photobiomodulation (PBM) involves light to activate cellular signaling pathways leading to cell proliferation or death. In this work, fluorescence and Coherent anti‐Stokes Raman Scattering (CARS) imaging techniques were applied to assess apoptosis in human cervical cancer cells (HeLa) induced by near infrared (NIR) laser light (808 nm). Using the Caspase 3/7 fluorescent probe to identify apoptotic...

article

Inside Cover: Cellular transformations in near‐infrared light‐induced apoptosis in cancer cells revealed by label‐free CARS imaging (J. Biophotonics 12/2019)

Svitlana M. Levchenko, Andrey N. Kuzmin, Artem Pliss, Tymish Y. Ohulchanskyy, more

Journal of Biophotonics > 12 > 12 > n/a - n/a

CARS microscopy was employed to monitor the reorganization of intracellular lipids and proteins, as well as cellular transformations, after irradiation with near infrared (NIR) light. NIR light was shown to induce apoptosis in HeLa cells in vitro in a dose‐dependent manner. The progression of apoptosis assessed with CARS microscopy is apparently associated with the generation of reactive oxygen species...

article

Stimuli‐Responsive Reversible Switching of Intersystem Crossing in Pure Organic Material for Smart Photodynamic Therapy

Wenbo Hu, Tingchao He, Hui Zhao, Haojie Tao, more

Angewandte Chemie > 131 > 32 > 11222 - 11228

Photosensitizers (PSs) with stimuli‐responsive reversible switching of intersystem crossing (ISC) are highly promising for smart photodynamic therapy (PDT), but achieving this goal remains a tremendous challenge. This study introduces a strategy to obtain such reversible switching of ISC in a new class of PSs, which exhibit stimuli‐initiated twisting of conjugated backbone. We present a multidisciplinary...

article

Stimuli‐Responsive Reversible Switching of Intersystem Crossing in Pure Organic Material for Smart Photodynamic Therapy

Wenbo Hu, Tingchao He, Hui Zhao, Haojie Tao, more

Angewandte Chemie International Edition > 58 > 32 > 11105 - 11111

article

Coherent Raman spectroscopic imaging to characterize microglia activation pathway

Chinmayee V. P. Dessai, Artem Pliss, Andrey N. Kuzmin, Edward P. Furlani, more

Journal of Biophotonics > 12 > 5 > n/a - n/a

Microglia are immune cells, which densely populate the central nervous system (CNS), and play essential role in suppression of neurodegenerative diseases, clearance of debris after CNS trauma, as well as serve as the last line of immune defense in response to any potential threat by being activated to eliminate diverse pathogens ranging from bacteria to cancer. The activated microglia cells are commonly...

article

In vitro Pharmacokinetic Cell Culture System that Simulates Physiologic Drug and Nanoparticle Exposure to Macrophages

Hilliard L. Kutscher, Gene D. Morse, Paras N. Prasad, Jessica L. Reynolds

Pharmaceutical Research > 2019 > 36 > 3 > 1-8

Purpose An in vitro dynamic pharmacokinetic (PK) cell culture system was developed to more precisely simulate physiologic nanoparticle/drug exposure. Methods A dynamic PK cell culture system was developed to more closely reflect physiologic nanoparticle/drug concentrations that are changing with time. Macrophages were cultured in standard static and PK cell culture systems with rifampin (RIF; 5 μg/ml)...

article

TiO₂‐coated fluoride nanoparticles for dental multimodal optical imaging

Ana K.S. Braz, Diógenes S. Moura, Anderson S.L. Gomes, Tymish Y. Ohulchanskyy, more

Journal of Biophotonics > 11 > 4 > n/a - n/a

Core‐shell nanostructures associated with photonics techniques have found innumerous applications in diagnostics and therapy. In this work, we introduce a novel core‐shell nanostructure design that serves as a multimodal optical imaging contrast agent for dental adhesion evaluation. This nanostructure consists of a rare‐earth‐doped (NaYF₄:Yb 60%, Tm 0.5%)/NaYF₄ particle as the core (hexagonal prism,...

article

Enhanced fatigue resistance of suppressed hysteresis in perovskite solar cells by an organic crosslinker

Chang-Keun Lim, Qi Li, Tianmu Zhang, Tim Thomay, more

Solar Energy Materials and Solar Cells > 2018 > 176 > C > 30-35

With record power conversion efficiencies of hybrid perovskite solar cells now exceeding 20% under laboratory conditions, improvements in stability of the cells under real-world working conditions are now key requirements for their commercial success. Here, we present a novel strategy to reduce penetration of humidity and oxygen into perovskite films via incorporation of a diammonium glycol. The two...

article

Interplay between structure and chiral properties of polyfluorene derivatives

Bruno Nowacki, Cristiano Zanlorenzi, Alexander Baev, Paras N. Prasad, more

Polymer > 2017 > 132 > C > 98-105

Design of supramolecular organization to produce large optical activity involves multiple factors either internal as external. In this paper, we report on the synthesis, systematic study and theoretical modeling of a series of chiral polyfluorene derivatives, whereby we identify the main parameters controlling the chiroptical activity of polymer films. For each polymer, five empirical/theoretical...

article

Strong Stimulated Mie Scattering From Plasmonic CuS Nanocrystals in Toluene or Pentane

Guang S. He, Maixian Liu, Joseph W. Haus, Mark T. Swihart, more

IEEE Journal of Selected Topics in Quantum Electronics > 2017 > 23 > 5 > 1 - 6

We report here strong stimulated Mie scattering (SMS) from a grating formed by optically redistributed plasmonic CuS nanocrystals (NCs), which exhibit a strong near-infrared localized surface plasmon resonance. We demonstrate that CuS NCs dispersed in a solvent, such as toluene or pentane, interact strongly with light due to their large polarizability that arises from their high concentration of free...

article

Lipid quantification by Raman microspectroscopy as a potential biomarker in prostate cancer

Jordan O'Malley, Rahul Kumar, Andrey N. Kuzmin, Artem Pliss, more

Cancer Letters > 2017 > 397 > C > 52-60

Metastatic castration-resistant prostate cancer (mCRPC) remains incurable and is one of the leading causes of cancer-related death among American men. Therefore, detection of prostate cancer (PCa) at early stages may reduce PCa-related mortality in men. We show that lipid quantification by vibrational Raman Microspectroscopy and Biomolecular Component Analysis may serve as a potential biomarker in...

article

Pump Spectral Linewidth-Dependent Competition and Dynamic Behaviors of Stimulated Brillouin-, Raman-, and Kerr-Scattering in Carbon Disulfide

Guang S. He, Paras N. Prasad

IEEE Journal of Quantum Electronics > 2017 > 53 > 1 > 1 - 9

In this paper, we present systematical results of pump spectral linewidth dependence of the threshold, energy conversion (nonlinear reflectivity), dynamic behavior, and spectral structure of backward stimulated Brillouin-, Raman-, and Kerr-scattering in CS₂ liquid pumped by 532-nm and nanosecond-pulsed laser beams, with three largely different spectral linewidths. First, under a super-narrow linewidth...

article

Pump spectral linewidth influence on stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) and self‐termination behavior of SRS in liquids

Guang S. He, Andrey Kuzmin, Paras N. Prasad

Annalen der Physik > 528 > 11-12 > 852 - 864

The threshold, temporal behavior, and conversion efficiency of stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SBS) in three liquids (benzene, hexane, and dimethyl sulfoxide) and two crystals (calcite and barium nitrate) have been investigated under three largely different spectral linewidth conditions. Pumped with 532‐nm and nanosecond duration laser pulses of ≤ 0.01 cm⁻¹ linewidth,...

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THIS WORK WAS SUPPORTED BY THE AIR FORCE OFFICE OF SCIENTIFIC RESEARCH (PROGRAM OFFICER: DR. KENNETH CASTER), GRANT %23 FA9550-20-1-0267. WE THANK THE INSTITUTE OF NANO SCIENCE AND TECHNOLOGY (INST), MOHALI FOR PROVIDING INFRASTRUCTURE AND CHARACTERIZATION FACILITIES. A. PAL ACKNOWLEDGES DST, SERB GRANT CRG/2020/004251 FOR THE FINANCIAL SUPPORT.

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THIS WORK WAS SUPPORTED BY THE AIR FORCE OFFICE OF SCIENTIFIC RESEARCH (PROGRAM OFFICER: DR. KENNETH CASTER), GRANT # FA9550-20-1-0267. WE THANK THE INSTITUTE OF NANO SCIENCE AND TECHNOLOGY (INST), MOHALI FOR PROVIDING INFRASTRUCTURE AND CHARACTERIZATION FACILITIES. A. PAL ACKNOWLEDGES DST, SERB GRANT CRG/2020/004251 FOR THE FINANCIAL SUPPORT. (2)
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INFONA - science communication portal

Search results for: Paras N. Prasad

Plasticizer‐Induced Enhancement of Mesoscale Dissymmetry in Thin Films of Chiral Polymers with Variable Chain Length

Stereoselective Plasmonic Interaction in Peptide‐tethered Photopolymerizable Diacetylenes Doped with Chiral Gold Nanoparticles

Stereoselective Plasmonic Interaction in Peptide‐tethered Photopolymerizable Diacetylenes Doped with Chiral Gold Nanoparticles

Spectral Manipulation of X‐Ray Excited Optical/Persistent Luminescence by Constructing Metal–Organic Framework@Fluoride Nanoparticles Composites

A Regioselectively Oxidized 2D Bi/BiOx Lateral Nano‐Heterostructure for Hypoxic Photodynamic Therapy

Hybrid Curdlan Poly(γ ‐Glutamic Acid) Nanoassembly for Immune Modulation in Macrophage

Interlayer‐Sensitized Linear and Nonlinear Photoluminescence of Quasi‐2D Hybrid Perovskites Using Aggregation‐Induced Enhanced Emission Active Organic Cation Layers

Cellular transformations in near‐infrared light‐induced apoptosis in cancer cells revealed by label‐free CARS imaging

Inside Cover: Cellular transformations in near‐infrared light‐induced apoptosis in cancer cells revealed by label‐free CARS imaging (J. Biophotonics 12/2019)

Stimuli‐Responsive Reversible Switching of Intersystem Crossing in Pure Organic Material for Smart Photodynamic Therapy

Stimuli‐Responsive Reversible Switching of Intersystem Crossing in Pure Organic Material for Smart Photodynamic Therapy

Coherent Raman spectroscopic imaging to characterize microglia activation pathway

In vitro Pharmacokinetic Cell Culture System that Simulates Physiologic Drug and Nanoparticle Exposure to Macrophages

TiO₂‐coated fluoride nanoparticles for dental multimodal optical imaging

Enhanced fatigue resistance of suppressed hysteresis in perovskite solar cells by an organic crosslinker

Interplay between structure and chiral properties of polyfluorene derivatives

Strong Stimulated Mie Scattering From Plasmonic CuS Nanocrystals in Toluene or Pentane

Lipid quantification by Raman microspectroscopy as a potential biomarker in prostate cancer

Pump Spectral Linewidth-Dependent Competition and Dynamic Behaviors of Stimulated Brillouin-, Raman-, and Kerr-Scattering in Carbon Disulfide

Pump spectral linewidth influence on stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) and self‐termination behavior of SRS in liquids

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