02213nas a2200157 4500008004100000245008000041210006900121260000800190300001600198490000600214520163600220100002801856700003101884700002701915856011301942 2017 eng d00aFire-retardant, self-extinguishing inorganic/polymer composite memory foams0 aFireretardant selfextinguishing inorganicpolymer composite memor cDEC a44864-448720 v93 aPolymeric foams used in furniture and automotive and aircraft seating applications rely on the incorporation of environmentally hazardous fire-retardant additives to meet fire safety norms. This has occasioned significant interest in novel approaches to the elimination of fire-retardant additives. Foams based on polymer nano composites or based on fire-retardant coatings show compromised mechanical performance and require additional processing steps. Here, we demonstrate a one-step preparation of a fire-retardant ice-templated inorganic/polymer hybrid that does not incorporate fire-retardant additives. The hybrid foams exhibit excellent mechanical properties. They are elastic to large compressional strain, despite the high inorganic content. They also exhibit tunable mechanical recovery, including viscoelastic "memory". These hybrid foams are prepared using ice-templating that relies on a green solvent, water, porogen. Because these foams are predominantly comprised of inorganic components, they exhibit exceptional fire retardance in torch burn tests and are self-extinguishing. After being subjected to a flame, the foam retains its porous structure and does not drip or collapse. In micro-combustion calorimetry, the hybrid foams show a peak heat release rate that is only 25% that of a commercial fire-retardant polyurethanes. Finally, we demonstrate that we can use ice-templating to prepare hybrid foams with different inorganic colloids, including cheap commercial materials. We also demonstrate that ice-templating is amenable to scale up, without loss of mechanical performance or fire-retardant properties.1 aChatterjee, Soumyajyoti1 aShanmuganathan, Kadhiravan1 aKumaraswamy, Guruswamy uhttps://library.ncl.res.in/content/fire-retardant-self-extinguishing-inorganicpolymer-composite-memory-foams01980nas a2200277 4500008004100000022001400041245010100055210006900156260000800225300001400233490000700247520102500254653002901279653002201308653002101330653002101351653002301372100002701395700002901422700001501451700002301466700003101489700002301520700003001543856012901573 2018 eng d a1433-785100aFlexible composite mechanical energy harvester from a ferroelectric organoamino phosphonium salt0 aFlexible composite mechanical energy harvester from a ferroelect cJUL a9054-90580 v573 a

A new binary organic salt diphenyl diisopropylamino phosphonium hexaflurophosphate (DPDPPF6) was shown to exhibit a good ferroelectric response and employed for mechanical energy harvesting application. The phosphonium salt crystallizes in the monoclinic noncentrosymmetric space group Cc and exhibits an H-bonded 1D chain structure due to N-HF interactions. Ferroelectric measurements on the single crystals of DPDPPF6 gave a well-saturated rectangular hysteresis loop with a remnant (P-r) polarization value of 6Ccm(-2). Further, composite devices based on polydimethylsiloxane (PDMS) films for various weight percentages (3, 5, 7, 10 and 20wt%) of DPDPPF6 were prepared and examined for power generation by using an impact test setup. A maximum output peak-to-peak voltage (V-PP) of 8.5V and an output peak-to-peak current (I-PP) of 0.5A was obtained for the non-poled composite film with 10wt% of DPDPPF6. These results show the efficacy of organic ferroelectric substances as potential micropower generators.

10abinary phosphonium salts10aenergy conversion10aferroelectricity10ahydrogen bonding10apolymer composites1 aVijayakanth, Thangavel1 aSrivastava, Anant, Kumar1 aRam, Farsa1 aKulkarni, Priyangi1 aShanmuganathan, Kadhiravan1 aPraveenkumar, Balu1 aBoomishankar, Ramamoorthy uhttps://library.ncl.res.in/content/flexible-composite-mechanical-energy-harvester-ferroelectric-organoamino-phosphonium-salt02185nas a2200253 4500008004100000022001400041245011300055210006900168260000800237300001600245490000800261520131000269100001501579700001901594700001901613700002801632700001901660700001801679700002501697700002501722700002701747700003101774856012601805 2018 eng d a1932-744700aFluorinated nanocellulose-reinforced all-organic flexible ferroelectric nanocomposites for energy generation0 aFluorinated nanocellulosereinforced allorganic flexible ferroele cJUL a16540-165490 v1223 a

We report here enhanced ferroelectric crystal formation and energy generation properties of polyvinylidene fluoride (PVDF) in the presence of surface-modified crystalline nanocellulose. Incorporation of only 2-5 wt % fluorinated nanocellulose (FNC) in PVDF has been found to significantly induce polar beta/gamma-phase crystallization as compared to the addition of unmodified nanocellulose (carboxylated nanocellulose). A device made up of electrically poled PVDF/FNC composite films yielded 2 orders of magnitude higher voltage output than neat PVDF in vibrational energy harvesting. This remarkable increase in energy generation properties of PVDF at such a low loading of an organic natural biopolymer could be attributed to the tailored surface chemistry of nanocellulose, facilitating strong interfacial interactions between PVDF and FNC. Interestingly, energy harvesting devices fabricated from PVDF/FNC nanocomposites charged a 4.7 mu F capacitor at significantly faster rate and the accumulated voltage on capacitor was 3.8 times greater than neat PVDF. The fact that PVDF/FNC nanocomposites still retain a strain at break of 10-15% and can charge a capacitor in few seconds suggests potential use of these nanocomposites as flexible energy harvesting materials at large strain conditions.

1 aRam, Farsa1 aAmbone, Tushar1 aSharma, Aakash1 aMurugesan, Rajarathinam1 aKajale, Deepak1 aBorkar, Vivek1 aAli, Shaikh, Faruque1 aBalu, Praveen, Kumar1 aKumaraswamy, Guruswamy1 aShanmuganathan, Kadhiravan uhttps://library.ncl.res.in/content/fluorinated-nanocellulose-reinforced-all-organic-flexible-ferroelectric-nanocomposites01889nas a2200229 4500008004100000245010700041210006900148260000800217300001000225490000800235520107000243100002801313700002201341700002101363700001501384700002901399700002601428700002201454700002601476700003101502856012601533 2018 eng d00a Functionalized carbon nanotube reinforced polymer nanocomposite microcapsules with enhanced stiffness0 aFunctionalized carbon nanotube reinforced polymer nanocomposite  cAUG a82-890 v5503 aMicrocapsules with tunable mechanical properties are highly desirable in pressure sensitive applications. We report here a facile approach to prepare polyurea/multiwall carbon nanotube (MWCNTs) nanocomposite microcapsules (MICs) with enhanced stiffness. A model compound dimethyl phthalate (DMP) was used as core material. MWCNTs were modified with reactive functional groups namely carboxyl (-COOH), amines (-NH2), and isocyanates (-NCO) to ensure a stronger interface between polymer wall and MWCNTs. Functionalization of MWCNTs was corroborated by Fourier transformed infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was employed to study the surface morphology of MICs. The presence of MWCNTs in the microcapsule wall was confirmed by transmission electron microscopy (TEM). MICs with functionalized MWCNTs show almost 100% increase in stiffness with respect to pristine capsules. All MICs show 92-97 +/- 1% encapsulation efficiency. The approach used in this paper can be broadly utilized to tune the mechanical properties of the microcapsules.1 aJagtap, Siddheshwar, B.1 aPatil, Vishal, D.1 aSuresh, Karthika1 aRam, Farsa1 aMohan, Muthu, Subramania1 aRajput, Shatruhan, S.1 aPatil, Shivprasad1 aShukla, Parshuram, G.1 aShanmuganathan, Kadhiravan uhttps://library.ncl.res.in/content/functionalized-carbon-nanotube-reinforced-polymer-nanocomposite-microcapsules-enhanced02217nas a2200289 4500008004100000022001400041245007500055210006900130260000900199300001400208490000700222520131600229653001501545653002201560653002101582653002301603653001801626100001901644700001901663700001801682700002501700700002001725700002001745700003101765700003001796856010101826 2021 eng d a1861-472800a Flexible energy harvester from an organic ferroelectric ammonium salt0 aFlexible energy harvester from an organic ferroelectric ammonium cDEC  a4122-41290 v163 aOrganic ferroelectrics due to their low cost, easy preparation, light weight, high flexibility and phase stability are gaining tremendous attention in the field of portable electronics. In this work, we report the synthesis, structure and ferroelectric behavior of a two-component ammonium salt 2, containing a bulky [Bn(4-BrBn)NMe2](+) (Bn=benzyl and 4-BrBn=4-bromobenzyl) cation and tetrahedral (BF4)(-) anion. The structural analysis revealed the presence of rich non-classical C-H...F and C-H...Br interactions in this molecule that were quantified by Hirshfeld surface analysis. The polarization (P) vs. electric field (E) hysteresis loop measurements on 2 gave a remnant polarization (P-r) of 14.4 mu C cm(-2) at room temperature. Flexible polymer composites with various (5, 10, 15 and 20) weight percentages (wt%) of 2 in thermoplastic polyurethane (TPU) were prepared and tested for mechanical energy harvesting applications. A notable peak-to-peak output voltage of 20 V, maximum current density of 1.1 mu A cm(-2) and power density of 21.1 mu W cm(-2) were recorded for the 15 wt% 2-TPU composite device. Furthermore, the voltage output generated from this device was utilized to rapidly charge a 100 mu F capacitor, with stored energies and measured charges of 156 mu J and 121.6 mu C, respectively.10aDielectric10aenergy harvesting10aferroelectricity10aorganic composites10apiezoelectric1 aGupta, Rishabh1 aSahoo, Supriya1 aDeswal, Swati1 aKothavade, Premkumar1 aDixit, Prashant1 aZareba, Jan, K.1 aShanmuganathan, Kadhiravan1 aBoomishankar, Ramamoorthy uhttps://library.ncl.res.in/content/flexible-energy-harvester-organic-ferroelectric-ammonium-salt02012nas a2200277 4500008004100000022001400041245012400055210006900179260000900248490000700257520104800264653002001312653002201332653001401354653002201368653001501390100002701405700001901432700002501451700002401476700001801500700002301518700003101541700003001572856013201602 2023 eng d a1433-785100a Ferroelectric aminophosphonium cyanoferrate with a large electrostrictive coefficient as a piezoelectric nanogenerator0 aFerroelectric aminophosphonium cyanoferrate with a large electro cJAN 0 v623 a

Hybrid materials possessing piezo- and ferroelectric properties emerge as excellent alternatives to conventional piezoceramics due to their merits of facile synthesis, lightweight nature, ease of fabrication and mechanical flexibility. Inspired by the structural stability of aminophosphonium compounds, here we report the first A(3)BX(6) type cyanometallate [Ph-2((PrNH)-Pr-i)(2)P](3)[Fe(CN)(6)] (1), which shows a ferroelectric saturation polarization (P-s) of 3.71 mu C cm(-2). Compound 1 exhibits a high electrostrictive coefficient (Q(33)) of 0.73 m(4) C-2, far exceeding those of piezoceramics (0.034-0.096 m(4) C-2). Piezoresponse force microscopy (PFM) analysis demonstrates the polarization switching and domain structure of 1 further confirming its ferroelectric nature. Furthermore, thermoplastic polyurethane (TPU) polymer composite films of 1 were prepared and employed as piezoelectric nanogenerators. Notably, the 15 wt % 1-TPU device gave a maximum output voltage of 13.57 V and a power density of 6.03 mu W cm(-2).

10aCyanometallates10aenergy conversion10aH-bonding10ahybrid composites10aPhosphorus1 aVijayakanth, Thangavel1 aSahoo, Supriya1 aKothavade, Premkumar1 aSharma, Vijay, Bhan1 aKabra, Dinesh1 aZareba, Jan, K. K.1 aShanmuganathan, Kadhiravan1 aBoomishankar, Ramamoorthy uhttps://library.ncl.res.in/content/ferroelectric-aminophosphonium-cyanoferrate-large-electrostrictive-coefficient-piezoelectric