10 results on '"Surjith Kumar Kumaran"'
Search Results
2. Photopolymerizable, Universal Antimicrobial Coating to Produce High-Performing, Multifunctional Face Masks
- Author
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Hyo-Jick Choi, Euna Oh, Sumin Han, and Surjith Kumar Kumaran
- Subjects
2019-20 coronavirus outbreak ,Letter ,Materials science ,Coronavirus disease 2019 (COVID-19) ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Bioengineering ,Nanotechnology ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Anti-Infective Agents ,Coating ,Photopolymerizable ,Humans ,General Materials Science ,Antiviral ,Face Mask ,SARS-CoV-2 ,Mechanical Engineering ,Masks ,technology, industry, and agriculture ,COVID-19 ,General Chemistry ,Antimicrobial Coating ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Antimicrobial ,Anti-Bacterial Agents ,0104 chemical sciences ,3. Good health ,Antibacterial ,Face masks ,13. Climate action ,engineering ,0210 nano-technology - Abstract
COVID-19 poses a major threat to global health and socioeconomic structures, and the need for a highly effective, antimicrobial face mask has been considered a major challenge for protection against respiratory diseases. Here, we report the development of a universal, antiviral, and antibacterial material that can be dip-/spray-coated over conventional mask fabrics to exhibit antimicrobial activities. Our data shows that antimicrobial fabrics rapidly inactivated multiple types of viruses, i.e., human (alpha/beta) coronaviruses, the influenza virus, and bacteria, irrespective of their modes of transmission (aerosol or droplet). This research provides an immediate method to contain infectious diseases, such as COVID-19.
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- 2021
3. Study of the Pathogen Inactivation Mechanism in Salt-Coated Filters
- Author
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Sang-Moo Kang, Matthew Lawson, Ki-Hye Kim, Sumin Han, Fu-Shi Quan, Hae-Ji Kang, Noopur Bhatnagar, Ki-Back Chu, Hyo-Jick Choi, Yu-Jin Jung, Su-Hwa Lee, Euna Oh, Surjith Kumar Kumaran, Ilaria Rubino, and Dong-Hun Lee
- Subjects
Materials science ,Recrystallization (geology) ,Potassium ,Sodium ,Salt (chemistry) ,chemistry.chemical_element ,030501 epidemiology ,Sodium Chloride ,Polypropylenes ,Potassium Chloride ,03 medical and health sciences ,chemistry.chemical_compound ,Influenza A Virus, H1N1 Subtype ,X-Ray Diffraction ,General Materials Science ,Respiratory Protective Devices ,030304 developmental biology ,Air filter ,chemistry.chemical_classification ,Aerosols ,0303 health sciences ,Chromatography ,Sulfates ,Masks ,Temperature ,Membranes, Artificial ,Antimicrobial ,Potassium sulfate ,Kinetics ,Klebsiella pneumoniae ,Membrane ,chemistry ,Air Filters ,Powders ,0305 other medical science ,Crystallization ,Filtration - Abstract
As COVID-19 exemplifies, respiratory diseases transmitted through aerosols or droplets are global threats to public health, and respiratory protection measures are essential first lines of infection prevention and control. However, common face masks are single use and can cause cross-infection due to the accumulated infectious pathogens. We developed salt-based formulations to coat membrane fibers to fabricate antimicrobial filters. Here, we report a mechanistic study on salt-induced pathogen inactivation. The salt recrystallization following aerosol exposure was characterized over time on sodium chloride (NaCl), potassium sulfate (K2SO4), and potassium chloride (KCl) powders and coatings, which revealed that NaCl and KCl start to recrystallize within 5 min and K2SO4 within 15 min. The inactivation kinetics observed for the H1N1 influenza virus and Klebsiella pneumoniae matched the salt recrystallization well, which was identified as the main destabilizing mechanism. Additionally, the salt-coated filters were prepared with different methods (with and without a vacuum process), which led to salt coatings with different morphologies for diverse applications. Finally, the salt-coated filters caused a loss of pathogen viability independent of transmission mode (aerosols or droplets), against both DI water and artificial saliva suspensions. Overall, these findings increase our understanding of the salt-recrystallization-based technology to develop highly versatile antimicrobial filters.
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- 2021
4. Photochromic Paper Indicators for Acidic Food Spoilage Detection
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Gabriele Nanni, Despina Fragouli, Maria Genovese, Sinoj Abraham, Athanassia Athanassiou, Gianvito Caputo, Surjith Kumar Kumaran, and Carlo Montemagno
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chemistry.chemical_classification ,Materials science ,Filter paper ,010405 organic chemistry ,General Chemical Engineering ,Composite number ,Food spoilage ,02 engineering and technology ,General Chemistry ,Polymer ,021001 nanoscience & nanotechnology ,01 natural sciences ,Article ,0104 chemical sciences ,lcsh:Chemistry ,Photochromism ,lcsh:QD1-999 ,chemistry ,Chemical engineering ,0210 nano-technology ,Acrylic polymer - Abstract
A photoresponsive microstructured composite is fabricated through the impregnation of cellulosic filter paper (FP) with a spiropyran-modified acrylic polymer. The polymer enwraps uniformly each individual cellulose fiber, increases the thermal stability of cellulose, and ensures the preservation of the composite functionalities even upon removal of the surface layers through mechanical scratching. The photochromic spiropyran moieties of the polymer, even while embedded in the cellulosic sheet, can reversibly interconvert between the colorless spiropyran and the pink merocyanine isomeric states upon irradiation with UV and visible light, respectively. Moreover, the photochromic polymer presents a faster photochromic response and a higher resistance to photodegradation, with an outstanding reusability for more than 100 switching cycles when it is incorporated in the cellulose network. Most importantly, the acidochromism of the modified FP, attributed to the spiropyran molecules after UV activation, allows the real-time optical and visual detection of acidity changes and spoilage in food products, such as wine and milk. Spoilage due to bacterial degradation and oxidation processes generates acidic vapors that induce the protonation of the merocyanine. This results in a visually detectable chromic transition from pink to white of the treated cellulose fibers, corresponding to a blue shift in the absorption spectrum. The developed photoresponsive cellulose composite can serve as cost-effective robust optical component in integrated functional platforms and consumer-friendly indicators for smart food packaging, as well as portable on demand acidoresponsive interfaces for gas monitoring in industrial and environmental applications.
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- 2018
5. Salt coatings functionalize inert membranes into high-performing filters against infectious respiratory diseases
- Author
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Surjith Kumar Kumaran, Su Hwa Lee, Hyo-Jick Choi, Dong-Hun Lee, Ilaria Rubino, Chun Il Kim, Hae Ji Kang, Euna Oh, Sana Kaleem, Sarah Armstrong, Ki Back Chu, Byeonghwa Jeon, Fu-Shi Quan, Alex Hornig, Shivanjali Choudhry, Sumin Han, and Romani Lalani
- Subjects
0301 basic medicine ,Materials science ,Hot Temperature ,Disease prevention ,Respiratory Protective Device ,Coronavirus disease 2019 (COVID-19) ,Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ,Science ,Pneumonia, Viral ,Sodium Chloride ,Gram-Positive Bacteria ,Article ,Biomaterials ,03 medical and health sciences ,Betacoronavirus ,0302 clinical medicine ,Gram-Negative Bacteria ,Infection transmission ,Humans ,Respiratory system ,Respiratory Protective Devices ,Pathogen inactivation ,Pandemics ,Inert ,Aerosols ,Public health ,Respiratory tract diseases ,Multidisciplinary ,SARS-CoV-2 ,Masks ,COVID-19 ,Humidity ,Membranes, Artificial ,Nanobiotechnology ,Pulp and paper industry ,Anti-Bacterial Agents ,030104 developmental biology ,Membrane ,Design, synthesis and processing ,Air Filters ,Medicine ,Infectious diseases ,Bacterial infection ,Coronavirus Infections ,Crystallization ,030217 neurology & neurosurgery - Abstract
Respiratory protection is key in infection prevention of airborne diseases, as highlighted by the COVID-19 pandemic for instance. Conventional technologies have several drawbacks (i.e., cross-infection risk, filtration efficiency improvements limited by difficulty in breathing, and no safe reusability), which have yet to be addressed in a single device. Here, we report the development of a filter overcoming the major technical challenges of respiratory protective devices. Large-pore membranes, offering high breathability but low bacteria capture, were functionalized to have a uniform salt layer on the fibers. The salt-functionalized membranes achieved high filtration efficiency as opposed to the bare membrane, with differences of up to 48%, while maintaining high breathability (> 60% increase compared to commercial surgical masks even for the thickest salt filters tested). The salt-functionalized filters quickly killed Gram-positive and Gram-negative bacteria aerosols in vitro, with CFU reductions observed as early as within 5 min, and in vivo by causing structural damage due to salt recrystallization. The salt coatings retained the pathogen inactivation capability at harsh environmental conditions (37 °C and a relative humidity of 70%, 80% and 90%). Combination of these properties in one filter will lead to the production of an effective device, comprehensibly mitigating infection transmission globally.
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- 2020
6. Biopolymers and natural polymers
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Euna Oh, Hyo-Jick Choi, Manika Chopra, and Surjith Kumar Kumaran
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Sustainable materials ,Engineering ,Sustainable systems ,Technological change ,business.industry ,Natural polymers ,Biochemical engineering ,business - Abstract
This chapter discusses the use of biopolymers/natural polymers in sustainable systems to solve current concerns over petroleum-based polymers. A comprehensive understanding and assessment of the current status of traditional biopolymers through the integration of various disciplines, such as engineering, biotechnology, chemistry, and biology, is expected to provide a systematic view on future research directions. Biopolymers have re-emerged into a new era of sustainable materials, and are expected to take an increasingly central role in the development of revolutionary applications. The competitive position of biopolymers can be achieved through technological progress to resolve multiple drawbacks related to materials developments, properties, and production costs.
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- 2020
7. Contributors
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Marya Ahmed, Muhammad Arshad, Anika Benozir Asha, Keshwaree Babooram, Seth Beck, Rabin Bissessur, Jingsi Chen, Hyo-Jick Choi, Manika Chopra, Diana Diaz Dussan, Mitsuhiro Ebara, Maria Kaliva, Surjith Kumar Kumaran, Mingwei Mu, Ravin Narain, Nauman Nazeer, Euna Oh, Yi-Yang Peng, Saadman S. Rahman, Shruti Srinivas, Aman Ullah, Maria Vamvakaki, Wenda Wang, Rui Yang, Shin-ichi Yusa, Hongbo Zeng, Wenling Zhang, and Muhammad Zubair
- Published
- 2020
8. Light-induced ATP driven self-assembly of actin and heavy-meromyosin in proteo-tubularsomes as a step toward artificial cells
- Author
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Sumalee Salahub, Surjith Kumar Kumaran, Carlo Montemagno, Anu Stella Mathews, Sinoj Abraham, and Satarupa Dhir
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macromolecular substances ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,Materials Chemistry ,Actin ,ATP synthase ,biology ,Artificial cell ,Heavy meromyosin ,Chemistry ,Vesicle ,Metals and Alloys ,Bacteriorhodopsin ,General Chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Membrane protein ,Ceramics and Composites ,biology.protein ,Biophysics ,Self-assembly ,0210 nano-technology - Abstract
In this work, we studied the light induced self-assembly of F-actin and heavy meromyosin (HMM) in tubular vesicles or "tubularsomes" during initiation by ATP. To mimic nature, light-induced ATP synthesis was used for the F-actin/HMM self-assembly inside these vesicles created from a triblock copolymer reconstituted with the membrane protein bacteriorhodopsin (bR) and F1F0-ATPase along with F-actin and HMM in the core.
- Published
- 2018
9. Gas-switchable carbon nanotube/polymer hybrid membrane for separation of oil-in-water emulsions
- Author
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Carlo D. Montemagno, Sinoj Abraham, and Surjith Kumar Kumaran
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Materials science ,General Chemical Engineering ,chemistry.chemical_element ,02 engineering and technology ,Carbon nanotube ,010402 general chemistry ,01 natural sciences ,law.invention ,Oil in water ,Clogging ,chemistry.chemical_compound ,law ,parasitic diseases ,Organic chemistry ,chemistry.chemical_classification ,food and beverages ,General Chemistry ,Polymer ,021001 nanoscience & nanotechnology ,Nitrogen ,0104 chemical sciences ,Membrane ,chemistry ,Chemical engineering ,Emulsion ,Carbon dioxide ,0210 nano-technology - Abstract
A gas responsive hybrid membrane is fabricated by surface-grafting PDEAEMA on carbon nanotubes. The reversable surface wettabilites switch from hydrophobic to hydrophilic by the introduction of carbon dioxide and nitrogen gases. These can be utilized for oil/water and oil/water emulsion separations. The switchable characteristics of the CNT/PDEAEMA membrane can effectively prevent membrane clogging.
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- 2017
10. Bio nano ink for 4D printing membrane proteins
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Anu Stella Mathews, Surjith Kumar Kumaran, Jiaxin Fan, Carlo D. Montemagno, and Sinoj Abraham
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Materials science ,Inkwell ,business.industry ,General Chemical Engineering ,3D printing ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Carbon nanotube ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Silver nanoparticle ,0104 chemical sciences ,law.invention ,law ,Nano ,Digital Light Processing ,0210 nano-technology ,business ,Stereolithography ,Curing (chemistry) - Abstract
The transfer of bio-functionality from natural living organisms to stable engineered environments opens a wide horizon of applications. Our work focusses on the creation of materials and devices that transform bio traits and collect, process and act on the information in response to changes in their local environment, thus promoting additive manufacturing from 3D space to a four-dimensional, functional space. In this work we have expanded the set of tools enabling the incorporation of biological function as an intrinsic property in the devices we print with a new class of light curable bio nano ink. This novel approach allows the 3D printing of acrylic polymer compositions containing biological materials, especially, membrane proteins using a photo (407 nm) curing stereolithography (SLA)/digital light processing (DLP) 3D printer. Retaining the bio functionality of these proteins gives a fourth dimensional (4D) aspect to this construct. Herein, we report the 4D printing of a bio-inspired nano hybrid electrode for water-splitting applications using a polymeric resin with proton-pumping bacteriorhodopsin (bR), silver nanoparticles (Ag NP) and carbon nanotubes (CNT). These printed photo electrochemical cells exhibit high durability, low onset over potential, and upon light irradiation (535 nm) produces hydrogen by a synergistic effect of Ag NP and bR.
- Published
- 2017
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