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  • 1.
    Samanta, Archana
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Chen, Hui
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Samanta, Pratick
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Sychugov, Ilya
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Berglund, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences (SCI), Applied Physics.
    Reversible dual-stimuli responsive chromic transparent wood bio-composites for smart window applications2021In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 13, p. 3270-3277Article in journal (Refereed)
    Abstract [en]

    Transparent wood (TW)-based composites are of significant interest for smart window applications. In this research, we demonstrate a facile dual-stimuli-responsive chromic TW where optical properties are reversibly controlled in response to changes in temperature and UV-radiation. For this functionality, bleached wood was impregnated with solvent-free thiol and ene monomers containing chromic components, consisting of a mixture of thermo- and photoresponsive chromophores, and was then UV-polymerized. Independent optical properties of individual chromic components were retained in the compositional mixture. This allowed to enhance the absolute optical transmission to 4 times above the phase change temperature. At the same time, the transmission at 550 nm could be reduced 11−77%, on exposure to UV by changing the concentration of chromic components. Chromic components were localized inside the lumen of the wood structure, and durable reversible optical properties were demonstrated by multiple cycling testing. In addition, the chromic TW composites showed reversible energy absorption capabilities for heat storage applications and demonstrated an enhancement of 64% in the tensile modulus as compared to a native thiol−ene polymer. This study elucidates the polymerization process and effect of chromic components distribution and composition on the material’s performance and perspectives toward the development of smart photoresponsive windows with energy storage capabilities.

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  • 2.
    Samanta, Archana
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Höglund, Martin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Samanta, Pratick
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Sychugov, Ilya
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Maddalena, Lorenza
    Politecnico di Torino Alessandria Site, Viale Teresa Michel 5 Alessandria 15121 Italy.
    Carosio, Federico
    Politecnico di Torino Alessandria Site, Viale Teresa Michel 5 Alessandria 15121 Italy.
    Berglund, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Charge Regulated Diffusion of Silica Nanoparticles into Wood for Flame Retardant Transparent Wood2022In: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 6, no 4, p. 2100354-2100354Article in journal (Refereed)
    Abstract [en]

    The preparation of wood substrates modified by charged inorganic nanoparticles (NPs) diffusing into the internal cell wall structure is investigated for generating functional properties. The flammability problem of wood biocomposites is addressed. NPs applied from colloidal sols carry charge to stabilize them against aggregation. The influence of charge on particle diffusion and adsorption should play a role for their spatial distribution and localization in the wood substrate biocomposite. It is hypothesized that improved dispersion, infiltration, and stability of NPs into the wood structure can be achieved by charge control diffusion, also restricting NP agglomeration and limiting distribution to the wood cell wall. Cationic and anionic silica NPs of ≈30 nm are therefore allowed to diffuse into bleached wood. The influence of charge on distribution in wood is investigated as a function of initial sol concentration. Transparent wood is fabricated by in situ polymerization of a thiol­ene in the wood pore space. These biocomposites demonstrate excellent flame retardancy with self­extinguishing characteristics. The approach has potential for commercial fabrication of flame retardant transparent composites for glazing and other building applications.

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  • 3.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites.
    Nandan, Bhanu
    Indian Institute of Technology Delhi, Department of Textile and Fibre Engineering, IIT Delhi Main Rd, IIT Campus, Hauz Khas, New Delhi, Delhi 110016, India, IIT Delhi Main Rd, IIT Campus, Hauz Khas, Delhi.
    Crystallization in PLLA-Based Blends, and Composites2023In: Polymer Crystallization: Methods, Characterization, and Applications, Wiley , 2023, p. 161-194Chapter in book (Other academic)
    Abstract [en]

    Poly (lactic acid) (PLA) has gained attention due to its mechanical performance, optical transparency, renewability, biocompatibility and biodegradability in recent past. The slow crystallization kinetics, poor thermal stability, brittleness and process complexity limit its practical applications. Hence, crystallization behavior of PLA was studied enormously in past to improve its performance. Here, in particular, crystallization behavior of poly (l -lactic acid) (PLLA) and its different forms (in blends, in composites, and after adding nucleating agents, etc.) are described.

  • 4.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Samanta, Archana
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Maddalena, Lorenza
    Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-15121 Alessandria, Italy..
    Carosio, Federico
    Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-15121 Alessandria, Italy..
    Gao, Ying
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat F, Nanjing 210037, Peoples R China..
    Montanari, Celine
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Nero, Mathias
    Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden..
    Willhammar, Tom
    Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden..
    Berglund, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Li, Yuan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites.
    Coloration and Fire Retardancy of Transparent Wood Composites by Metal Ions2023In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 15, no 50, p. 58850-58860Article in journal (Refereed)
    Abstract [en]

    Transparent wood composites (TWs) offer the possibility of unique coloration effects. A colored transparent wood composite (C-TW) with enhanced fire retardancy was impregnated by metal ion solutions, followed by methyl methacrylate (MMA) impregnation and polymerization. Bleached birch wood with a preserved hierarchical structure acted as a host for metal ions. Cobalt, nickel, copper, and iron metal salts were used. The location and distribution of metal ions in C-TW as well as the mechanical performance, optical properties, and fire retardancy were investigated. The C-TW coloration is tunable by controlling the metal ion species and concentration. The metal ions reduced heat release rates and limited the production of smoke during forced combustion tests. The potential for scaled-up production was verified by fabricating samples with a dimension of 180 x 100 x 1 (l x b x h) mm(3).

  • 5.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Samanta, Archana
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Montanari, Celine
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Li, Yuanyuan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Maddalena, Lorenza
    Politecn Torino, Dipartimento Sci Applicata & Tecnol, Alessandria Campus,Viale Teresa Michel 5, I-15121 Alessandria, Italy..
    Carosio, Federico
    Politecn Torino, Dipartimento Sci Applicata & Tecnol, Alessandria Campus,Viale Teresa Michel 5, I-15121 Alessandria, Italy..
    Berglund, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Fire-retardant and transparent wood biocomposite based on commercial thermoset2022In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 156, article id 106863Article in journal (Refereed)
    Abstract [en]

    Transparent wood (TW) biocomposites combine high optical transmittance and good mechanical properties and can contribute to sustainable development. The safety against fire is important for building applications. Here, a "green" bleached wood reinforcement is impregnated by water soluble and flame-retardant melamine formaldehyde (MF) in a scalable process, for a wood content of 25 vol%. FE-SEM is used for characterization of optical defects and EDX to examine MF distribution at nanoscale cell wall pore space. Curing (FTIR-ATR), mechanical properties, optical transmittance (74% at 1.2 mm thickness) and flame-retardant properties are also characterized (self-extinguishing behavior and cone calorimetry), and scattering mechanisms are discussed. The fire growth rate of transparent wood was less than half the values for neat wood. Transparent wood/MF biocomposites show interesting wood-MF synergies and are of practical interest in building applications. Critical aspects of processing are analyzed for minimization of optical defects.

  • 6.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India.
    Srivastava, Rajiv
    Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India.
    Nandan, Bhanu
    Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India.
    Fabrication and crystallization behavior of hollow poly(l-lactic acid) nanofibers2020In: Polymer Crystallization, ISSN 2573-7619, Vol. 3, no 5, article id e10147Article in journal (Refereed)
    Abstract [en]

    In this study, a bundle of poly(l-lactic acid) (PLLA) hollow nanofibers was prepared through anodic aluminum oxide (AAO) membrane wetting method. The infiltrated PLLA in the nanopores of AAO membrane were isolated via etching of the membrane using phosphoric acid, preserving their original nanostructure. The outer diameter of isolated PLLA nanofibers and wall thickness were found to be 235 ± 17 nm and 38.5 ± 9 nm, respectively. The differential scanning calorimetry analysis showed that the hollow PLLA nanofibers exhibited lower melting and crystallization temperatures than the bulk PLLA sample. Furthermore, the wide-angle X-ray diffraction measurement suggested that PLLA crystallized preferentially along the 110/200 plane direction due to confinement effect of the AAO walls. Such hollow PLLA nanofibers may have potential application as a drug delivery system.

  • 7.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Thangapandian, V.
    Srivastava, R.
    Nandan, B.
    Frustrated Crystallization behavior of Poly(ethylene oxide) in Electrospun Core-Shell Nanofibers and Beads2021In: Fibers And Polymers, ISSN 1229-9197, E-ISSN 1875-0052, Vol. 22, no 10, p. 2750-2761Article in journal (Refereed)
    Abstract [en]

    Confined crystallization behavior of poly(ethylene oxide) (PEO) was studied in electrospun core-shell nanofibers and beads, respectively, using DSC. The core-shell structure consisted of PEO core and polystyrene (PS) shell. It was observed that the morphology of PEO core changed from continuous to discrete domains when the core spinning solvent was switched from water to chloroform. This significantly influenced the crystallization behavior of PEO such that whereas the crystallization nucleation mechanism was heterogeneous for nanofibers with continuous PEO core, it became fractionated for nanofibers with discontinuous PEO core. The relaxation of the PEO domains, in the nanofibers with discontinuous core, via thermal annealing above the glass transition temperature of PS shell, markedly increased homogenous nucleation contribution in the crystallization. This plausibly was due to relaxation of PEO domains through domain breakup and coalescence process resulting in higher fraction of nanosized PEO domains.

  • 8.
    Samanta, Pratick
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Indian Inst Technol Delhi, Dept Text & Fibre Engn, New Delhi 110016, India..
    Thangapandian, V
    Indian Inst Technol Delhi, Dept Text & Fibre Engn, New Delhi 110016, India..
    Srivastava, Rajiv
    Indian Inst Technol Delhi, Dept Text & Fibre Engn, New Delhi 110016, India..
    Nandan, Bhanu
    Indian Inst Technol Delhi, Dept Text & Fibre Engn, New Delhi 110016, India..
    Non-isothermal crystallization kinetics of confined poly (ethylene oxide) in electrospun nanofibers prepared from polystyrene/ poly (ethylene oxide) blends2022In: Journal of polymer research, ISSN 1022-9760, E-ISSN 1572-8935, Vol. 29, no 4, article id 125Article in journal (Refereed)
    Abstract [en]

    Study on non-isothermal crystallization kinetics of polymer is relevant for both fundamental as well as application perspective. Hence, the non-isothermal crystallization kinetics of bulk and confined poly(ethylene oxide) (PEO) in electrospun nanofibers was investigated using DSC. The nanofibers were prepared from polystyrene (PS)/PEO immiscible blends where PEO weight fraction was varied upto 0.4. It was found that the Avarmi and Jeziorny models successfully predict the nucleation nature of PEO chains and its growth behavior. However, the Ozawa model was not found to be suitable for the confined system. Nevertheless, the Mo's method, which is the combination of Avrami and Ozawa models, effectively described the non-isothermal crystallization behavior of PEO in confined domains. The Kissinger and Takhor methods showed that activation energy for crystallization of PEO chains increased with reduction of PEO weight fraction in the nanofibers. This was plausibly due to the geometrical restriction on the mobility of PEO chains. The present study is the first report on non-isothermal crystallization behavior of confined polymer in electrospun nanofibers systems.

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