List of Publications

1.         R. Duarah Y. P. Singh, B. Mandal and N. Karak, Sustainable Starch Modified Polyol Based Tough Biocompatible Hyperbranched Polyurethane with Shape Memory Attribute, New J. Chem., (2016) DOI: 10.1039/C5NJ03294F
2.         D. Hazarika and N. Karak, Photocatalytic degradation of organic contaminants under solar light using carbon dot/titanium dioxide nanohybrid, obtained through a facile approach, Applied Surface Science 376 (2016) 276–285
3.         P. Baruah and N. Karak, Bio-based tough hyperbranched epoxy/ graphene oxide nanocomposite with enhanced biodegradability attribute, Polym. Degrad. Stabil. 129 (2016)26-33 
4.         S. Gogoi, M. Kumar, B. Mandal and N. Karak, Renewable resource based carbon dot decorated hydroxyapatite nanohybrid and its fabrication with waterborne hyperbranched polyurethane for bone tissue engineering, RSC Advances, 6 (2016) 26066 - 26076
5.         D. Bhagawati, S. Thakur and N. Karak, Castor oil based hyperbranched polyester/ bitumen modified fly ash nanocomposite, Advances in Nano Research, 4(2016)15-29  
6.         V. K. Das, S.N. Harsha and N. Karak, Highly efficient and active silver nanoparticles catalyzed conversion of aldehydes into nitriles: A greener, convenient and versatile "NOSE" approach, Tetrahedron Lett. 57 (2016) 549–553
7.         A. Saikia and N. Karak, Castor oil based hyperbranched epoxy/clay nanocomposites for thin film applications, American Journal of Engineering and Applied Sciences 9 (2016)31- 40
8.         S. Barua, P. P. Banerjee, A. Sadhu, A. Sengupta, S. Chatterjee, S. Sarkar, S. Barman, A. Chattopadhyay, S. Bhattacharya, N. C. Mondal, N. Karak, Silver nanoparticles as antibacterial and anticancer materials against human breast, cervical and oral cancer cells, J. Nanosci. Nanotechnol. (2016) doi:10.1166/jnn.2016.12636
9.         B. Ghosh, S. Gogoi, S. Thakur and N. Karak, Bio-based waterborne polyurethane/carbon dot nanocomposite as a surface coating material, Prog. Org. Coat. 90 (2016) 324–330
10.     S. Thakur, S. Barua and N. Karak, Reduced  graphene  oxide-metal  oxide  nanohybrid  for  efficient adsorption,  photodegradation  and  photoinactivation  of  chemical and microbial contaminants, J. Nanotechnol. Diagnosis and Treatment, 3(2015)12-22
11.     B. De, M. Kumar, B. Mandal and N. Karak, An in situ prepared photo-luminescent transparent biocompatible hyperbranched epoxy/carbon dot nanocomposite, RSC Advances, 5 (2015) 74692-74704
12.     D. Hazarika and N. Karak, Waterborne sustainable tough hyperbranched aliphatic polyester thermosets, ACS Sustainable Chem. Eng.  3 (2015) 2458–2468
13.     S. Gogoi, M. Kumar, B. Mandal and N. Karak, High performance luminescent thermosetting waterborne hyperbranched polyurethane/carbon quantum dot nanocomposite with in vitro cytocompatibility, Composites Science and Technology 118 (2015) 39-46
14.     R. Duarah and N. Karak, Starch based sustainable tough hyperbranched epoxy thermoset, RSC Advances, 5 (2015) 64456 - 64465
15.     S. Thakur and N. Karak, Alternative methods and nature-based reagents for the reduction of graphene oxide - a review, Carbon 94(2015) 224–242
16.     B. De, K. Gupta,   M. Mandal and N. Karak, Biocide immobilized OMMT-carbon dot reduced Cu2O nanohybrid/hyperbranched epoxy nanocomposites: Mechanical, thermal, antimicrobial and optical properties, Mater. Sci. Eng. C 56 (2015) 74-83
17.     S. Barua, P. Chattopadhyay and N. Karak, S-triazine based biocompatible hyperbranched epoxy adhesive with antibacterial attribute for suture less surgical sealing, J. Mater. Chem. B. 3 (2015)5877 - 5885
18.     S. Barua, B. Gogoi, L. Aidew, A. K.Buragohain, P. Chattopadhyay and N. Karak, Sustainable resource based hyperbranched epoxy nanocomposite as an infection resistant, biodegradable, implantable muscle scaffold, ACS Sustainable Chem. Eng. 3 (2015) 1136-1144
19.     S. Thakur and N. Karak, Tuning of sunlight-induced self-cleaning and self-healing attributes of an elastomeric nanocomposite by judicious compositional variation of TiO2-reduced graphene oxide nanohybrid, J. Mater. Chem. A 3 (2015)12334-12342
20.     B. De and N. Karak, Ultra low dielectric, high performing hyperbranched epoxy thermosets: Synthesis, characterization and property evaluation, RSC Advances, 5(2015)35080 - 35088
21.    S. Pramanik, R.  Gopalakrishnan, N. Barua, A.  K. Buragohain, N. Karak, Montmorillonite immobilized Curcuma aromatic/ Zanthoxylum limonella oil nanoconjugate as a green antibacterial and biocompatible material with mosquito repellent attributes, Appl. Clay Sci.  109–110(2015)33-38 
22.    S. Gogoi and N. Karak, Biobased high performance waterborne hyperbranched polyurethane thermoset, Polym. Adv. Technol. 26(2015)589–596
23.    B. Das, P. Chattapadhya, S. Maji, A. Upadhyay, M. Purkayastha, C. Mohanta, T. Maity and N. Karak, Bio-functionalized MWCNT/hyperbranched polyurethane bionanocomposite for bone regeneration, Biomed. Mater. 10 (2015) 025011(16pp)
24.    S. Gogoi, S. Barua and N. Karak, Cross-linking kinetics of hyperbranched epoxy cured hyperbranched polyurethane and optimization of reaction conversion by central composite design, Chem. Eng. Sci.  127 (2015) 230–238
25.    S. Thakur and N. Karak, A tough smart elastomeric bio-based hyperbranched polyurethane nanocomposite,  New J. Chem. 39 (2015) 2146 - 2154
26.    S. Thakur, S. Barua and N. Karak, Self-healable castor oil based tough smart hyperbranched polyurethane nanocomposite with antimicrobial attribute, RSC Adv. 5 (2015) 2167-2176
27.    B. De, B. Voit and N. Karak, Tough hyperbranched epoxy/neem-oil modified OMMT thermosetting nanocomposite with antimicrobial attribute, New J. Chem. 39 (2015) 595 – 603
28.    D. Talukdar, G Das, S. Thakur, N. Karak and A. J. Thakur, Copper nanoparticles decorated Organically Modified Montmorillonite (OMMT): An efficient catalyst for the N-arylation of indoles and similar heterocycles, Catalysis Communications 59 (2015) 238–243
29.    S. Barua, P. Chattopadhyay, L. Aidew, A. K.Buragohain and N. Karak, Infection resistant hyperbranched epoxy nanocomposite as a scaffold for skin tissue regeneration, Polym. Int. 64 (2015)303-311
30.    S. Gogoi and N. Karak, Bio-based biodegradable waterborne hyperbranched polyurethane as an eco-friendly sustainable material,  ACS Sustainable Chem. Eng. 2 (2014) 2730−2738
31.    B. De, B. Voit and N. Karak, Carbon dot reduced Cu2O nanohybrid/hyperbranched epoxy nanocomposite: Mechanical, thermal and photocatalytic activity, RSC Adv. 4 (2014)58453–58459
32.    S. Pramanik, J. Hazarika, A. Kumar, L. Aidew, A. K. Buragohain and N Karak, Green Silver Nanoparticles Decorated Multiwalled Carbon Nanotube- A Precursor for Fabrication of Multifunctional Biobased Sustainable Nanocomposites,  ACS Sustainable Chem. Eng. 2(2014) 2510–2518
33.    K. Gupta,   S. Barua,   S. N. Hazarika,  A. K Manhar,   D. Nath,   N. Karak,  N. D. Namsa,   R. Mukhopadhyay,   V. Kalia and  M. Mandal, Green silver nanoparticles: enhanced antimicrobial and antibiofilm activity with effects on DNA replication and cell cytotoxicity, RSC Adv. 4 (2014) 52845-52855
34.    S. Barua, P. Chattopadhyay, M. Phukan, B. Konwar, J. Islam and N. Karak, Biocompatible hyperbranched epoxy/silver-reduced graphene oxide-curcumin nanocomposite as an advanced antimicrobial material, RSC Adv. 4 (2014) 47797– 47805
35.    S. Barua, P. Chattopadhyay, M. Phukan, B. Konwar and N. Karak, Hyperbranched epoxy/MWCNT-CuO-nystatin nanocomposite as a high performance, biocompatible, antimicrobial material, Mater. Res. Express 1 (2014) 045402
36.    S. Thakur and N. Karak, Multi-stimuli responsive smart elastomeric hyperbranched polyurethane/ reduced graphene oxide nanocomposites, J. Mater. Chem. A 2(2014) 14867-14875
37.    B. Das, P. Chattapadhya A. Upadhyay, K. Gupta, M. Mandal, and N. Karak, Biophysico-chemical interfacial attributes of Fe3O4 decorated MWCNT nanohybrid/ bio-based hyperbranched polyurethane nanocomposite: An antibacterial wound healing material with controlled drug release potential, New J. Chem. 38(2014)4300-4311
38.    S. Gogoi S. Barua, and N. Karak, Biodegradable and thermostable synthetic hyperbranched poly(urethane-urea)s as advanced surface coating materials, Prog. Org. Coat. 77(2014)1418–1427
39.    S. Thakur and N. Karak, Ultratough ductile castor oil based hyperbranched polyurethane nanocomposites using functionalized reduced graphene oxide, ACS Sustainable Chem. Eng. 2(2014)1195–1202
40.    S. Thakur and N. Karak, One-step approach to prepare magnetic iron oxide/reduced graphene oxide nanohybrid for efficient organic and inorganic pollutants removal, Materials Chemistry and Physics 144(2014)425-432
41.    G.  Das, R.  D  Kalita, P. Gogoi, A.   K Buragohain and N. Karak, Antibacterial activities of copper nanoparticles decorated organically modified montmorillonite/epoxy nanocomposites, Appl. Clay Sci. 90 C(2014)18-26
42.    B. De and N. Karak, Tough hyperbranched epoxy / poly(amido-amine) modified bentonite thermosetting nanocomposites, J. Appl. Polym. Sci. 131(2014) 40327(pp8) 
43.    S. Barua, S. Thakur and N. Karak, One step preparation of biocompatible, antimicrobial reduced graphene oxide-silver nanohybrid as a topical antimicrobial agent, RSC Adv. 4 (2014)9777-9783
44.    H. Kalita and N. Karak, Hyperbranched polyurethane/triethanolamine functionalized multi-walled carbon nanotube nanocomposites as remote induced smart materials, Polym. Int. 63 (2014) 1295–1302
45.    S. Barua, N. Dutta, S. Karmakar, P. Chattopadhyay, L. Aidew, A. K.Buragohain and N. Karak, Biocompatible high performance hyperbranched epoxy/clay nanocomposite as an implantable material, Biomed. Mater. 9 (2014) 025006 (14pp)
46.    S. Pramanik, R. Konwarh, N. Barua, A. K. Buragohain and N Karak, Bio-based hyperbranched poly(ester amide)/MWCNT nanocomposites: multimodalities at biointerface, Biomater. Sci. 2(2014)192-202
47.    R. Konwarh, M. Shail, T. Medhi, M. Mandal and N. Karak, Sonication assisted assemblage of exotic polymer supported nanostructured bio-hybrid system and prospective application, Ultrasonics Sonochemistry 21(2014) 634-642
48.    S. Pramanik, P. Bharali, B. K. Konwar and N. Karak, Antimicrobial hyperbranched poly(ester amide)/polyaniline nanofiber modified montmorillonite nanocomposites, Mater. Sci. Eng. C 35(2014)61-69
49.    H. Kalita and N. Karak, Bio-based hyperbranched shape memory polyurethanes: effect of different vegetable oils, J. Appl. Polym. Sci. 131(2014)39579/1-39579/8
50.    G. Das, N. Kakati, S. H. Lee, N. Karak and Y. S. Yoon, Water soluble sodium sulfate nanorods as a versatile template for the designing of copper sulfide nanotubes, J. Nanosci. Nanotechnol. 14(2014)4455-4461 
51.    H. Kalita and N. Karak, Bio-based hyperbranched thermosetting polyurethane/triethanolamine functionalized multi-walled carbon nanotube nanocomposites as shape memory materials, J. Nanosci. Nanotechnol. 14(2014)5435-5442
52.    H. Kalita and N. Karak, Bio-based hyperbranched polyurethane/multi-walled carbon nanotube nanocomposites as shape memory materials, Polym. Compos. 35(2014) 636–643
53.    B. Roy, P. Bharali, B. K. Konwar and N. Karak, Modified hyperbranched epoxy/clay nanocomposites: a study on thermal property, antimicrobial and biodegradation, Int. J. Mater. Res. 105 (2014)296-307 
54.    B. De, K. Gupta, M Mandal, and N. Karak, Bio-degradable hyperbranched epoxy from castor oil based hyperbranched polyester polyol, ACS Sustainable Chem. Eng. 2 (2014) 445–453 
55.    B. De and N. Karak, A room temperature cured low dielectric hyperbranched epoxy adhesive with high mechanical strength, J. Chem. Sci. 126(2014)587-595
56.    H. Deka and N. Karak, Epoxy modified bio-based hyper branched polyurethane/clay nano composites: rheology and biodegradability, J. Nano Sci., Nano Eng. Appl. 3(2013)1-12
57.    S. Pramanik, N. Barua, A. K. Buragohain, J. Hazarika, A. Kumar and N. Karak, Bio-functionalized MWCNT: A reactive component for the in-situ polymerization of hyperbranched poly(ester amide) and delving into its bio-physico interfacial properties, J Phy. Chem. C 117 (2013)25097−25107
58.    B. De, B. Voit and N. Karak, Transparent luminescent hyperbranched epoxy / carbon oxide dot nanocomposites with outstanding toughness and ductility, ACS Appl. Mater. Interface 5(2013)10027–10034
59.    H. Kalita and N. Karak, Hyperbranched polyurethane/Fe3O4 thermosetting nanocomposites as shape memory materials, Polym. Bull. 70 (2013)2953–2965
60.    H. Kalita and N. Karak, Hyperbranched polyurethane/Fe3O4 nanoparticles decorated multi-walled carbon nanotube thermosetting nanocomposites as microwave actuated shape memory materials, J. Mater. Res. 28(2013)2132-2141
61.    S. Barua, G. Das, L. Aidew, A. K. Buragohain and N. Karak, Copper/copper oxide coated nanofibrillar cellulose- a promising biomaterial, RSC Adv. 3 (2013)14997-15004
62.    B. Das, P. Chottapadhyay, D. Mishra, T. K. Maiti, S. Maji, R. Narayan and N. Karak, Nanocomposites of bio-based hyperbranched polyurethane/functionalized MWCNT as non-immunogenic, osteoconductive, biodegradable and biocompatible scaffolds in bone tissue engineering, J. Mater. Chem. B: Materials for Biology and Medicine 1 (2013)4115-4126 
63.    A. Gogoi, G.A. Ahmed, G. Das, N. Karak, R. Boruah and A.J. Choudhury, Laboratory measurements of the light scattering properties of bentonite clay particles embedded in cylindrical polymer matrix, J. Modern Optics 60 (2013)603-610

64.    S. Thakur and N. Karak, Bio-based tough hyperbranched polyurethane-graphene oxide nanocomposites as advanced shape memory materials, RSC Adv. 3(2013)9476-9482

65.    H. Kalita and N. Karak, Bio-based hyperbranched polyurethane/Fe3O4 nanocomposites as shape memory materials, Polym. Adv. Technol. 24 (2013) 819-823

66.    S. Pramanik, J. Hazarika, A. Kumar and N. Karak, Castor oil based hyperbranched poly(ester amide)/polyaniline nanofiber nanocomposites as antistatic materials, Ind. Eng. Chem. Res. 52(2013)5700-5707

67.    H. Kalita and N. Karak, Fe3O4 nanoparticles decorated multi-walled carbon nanotube/hyperbranched polyurethane nanocomposites as shape memory materials, J. Nanoeng. Nanomanuf. 3 (2013) 194-201

68.    S. Thakur and N. Karak, Green one-step approach to prepare sulfur/ reduced graphene oxide nanohybrid for effective mercury ions removal, J. Phy. Chem. C 117 (2013)7636-7642

69.    B. De and N. Karak, Green and Facile Approach for Water Soluble Fluorescent Carbon Dots from Banana Juice, RSC Adv. 3(2013)8286-8290

70.    G. Das, R. D. Kalita, H. Deka, A. K. Buragohain and N. Karak, Biodegradation, cytocompatability and performance studies of vegetable oil based hyperbranched polyurethane modified biocompatible sulfonated epoxy resin/clay nanocomposites, Prog. Org. Coat. 76 (2013) 1103–1111

71.    S. Barua, G. Dutta and N. Karak, Glycerol based tough hyperbranched epoxy: synthesis, statistical optimization and property evaluation, Chem. Eng. Sci. 95 (2013)138–147

72.    B. Das, M. Mandal, A. Upadhyay, P. Chattopadhya and N. Karak, Bio-based hyperbranched polyurethane/Fe3O4 nanocomposites: smart antibacterial biomaterials for biomedical device and implant, Biomed. Mater. 8(2013)035003(12pp)

73.    S. Pramanik, G. Das and N. Karak, Facile preparation of polyaniline nanofibers modified bentonite nanohybrid for gas sensor application, RSC Adv. 3(2013)4574-4581

74.    R. Konwarh, M. Misra and N. Karak, Electrospun cellulose acetate nanofibers: the present status and gamut of biotechnological applications, Biotechnol. Adv. 31(2013)421–437

75.    S. Pramanik, R. Konwarh, K. Sagar, B. K. Konwar and N Karak, Bio-degradable vegetable oil based hyperbranched poly(ester amide) as an advanced surface coating material, Prog. Org. Coat. 76(2013)689-697

76.    S. Barua, R. Konwarh, S. S. Bhattacharya, P. Das, K. S. P. Devi, T. K. Maiti, M. Mandal and N. Karak, Non-hazardous anticancerous and antibacterial colloidal 'green' silver nanoparticles, Colloids and Surfaces B: Biointerfaces 105( 2013)37–42

77.    S. Pramanik, R. Konwarh, R. C. Deka, L. Aidew, N. Barua, A. K. Buragohain, D. Mohanta and N. Karak, Microwave-assisted poly(glycidyl methacrylate)-functionalized multiwall carbon nanotubes with a 'tendrillar' nanofibrous polyaniline wrapping and their interaction at bio-interface, Carbon 55(2013)34–43

78.    B. Roy, P. Bharali, B. K. Konwar and N. Karak, Silver-embedded modified hyperbranched epoxy/clay nanocomposites as antibacterial materials, Bioresource Technol. 127(2013)175-180

79.    S. Thakur and N. Karak, Castor oil-based hyperbranched polyurethanes as advanced surface coating Materials, Prog. Org. Coat. 76(2013)157–164

80.    R. Konwarh, A. K. Mohanty, M. Misra and N. Karak, Diameter-tuning of electrospun cellulose acetate fibers: a Box-Behnken design (BBD) study, Carbohydrate Polymers 92(2013)1100-1106

81.    B. De and N. Karak, Novel high performance tough hyperbranched epoxy by an A2 + B3 polycondensation reaction, J. Mater. Chem. A 1(2013)348-353 

82.    B. Das, U. Konwar, M. Mandal and N. Karak, Sunflower oil based biodegradable hyperbranched polyurethane as a thin film material, Ind. Crops and Products 44(2013)396–404

83.    H. Kalita and N. Karak, Epoxy modified bio-based hyperbranched polyurethane thermosets, Design. Monomers Polym. 16 (2013)447-455

84.    S. Barua, R. Konwarh, M. Mandal, R. Gopalakrishnan, D. Kumar and N. Karak, Biomimetically prepared antibacterial, free radical scavenging poly(ethylene glycol) supported silver nanoparticles as Aedes albopictus larvicidal agent, Adv. Sci. Eng. Medi. 5(2013)201-208

85.    B. Das, P. Chattopadhya, M.Mandal, B. Voit and N. Karak, Bio-based biodegradable and biocompatible hyperbranched polyurethane: a scaffold for tissue engineering, Macromol. Biosci. 13(2013)126–139

86.    J. P. Saikia, R. Konwarh, B. Konwar, and N. Karak,   Isolation and immobilization of Aroid polyphenol on magnetic nanoparticles: enhancement of potency on surface immobilization, Colloids and Surfaces B: Biointerfaces 102(2013)450-456

87.    S. Pradeep, R. Konwarh, B. K. Konwar and N. Karak,   Molecular Docking studies on analogues of quercetin with D-alanine-D-alanine ligase of Helicobacter pyroli, Medicinal Chemistry Research 22(2013)2139-2150

88.    G. Das, H. Deka and N. Karak, Bio-based sulfonated epoxy/hyperbranched polyurea-modified MMT nanocomposites, Int. J. Polym. Mater. 62(2013)330–335

89.    H. Kalita, M. Mandal and N. Karak, Biodegradable solvent induced shape memory hyperbranched polyurethane, J. Polym. Res. 19(2012)1-8

90.    S. Thakur and N. Karak, Green reduction of graphene oxide by aqueous phytoextracts, Carbon 50(2012)5331–5339

91.    R. Konwarh, S. Pramanik, D. Kalita, C. L. Mahanta and N. Karak, Ultrasonication- a complementary 'green chemistry' tool to biocatalysis: a laboratory-scale study of lycopene extraction, Ultrasonics Sonochemistry 19 (2012)292-299

92.    G. Das and N. Karak, Mesua ferrea L. seed oil based amido-amine modified nanoclay/epoxy nanocomposites, J. Appl. Polym. Sci. 124 (2012) 2403–2414

93.    M. Deka,  A. Kumar,  H. Deka and N. Karak, Ionic transport studies in hyperbranched polyurethane/clay nanocomposite gel polymer electrolytes, Ionics 18 (2012):181–187

94.    G. Das, N. K. Bordoloi, S.K. Rai, A. K Mukherjee and N. Karak, Biodegradable and biocompatible epoxidized vegetable oil modified thermostable poly(vinyl chloride):Thermal and Performance characteristics post biodegradation with Pseudomonas aeruginosa and Achromobacter sp., J. Hazardous Mater. 209-210(2012)435-442

95.    G. Das, J. K Roy, A. K Mukherjee and N. Karak, Mesua ferrea L. seed oil modified sulfone epoxy resin and multi-walled carbon nanotube nanocomposites and their biomedical and mechanical properties, Adv. Sci. Lett. 6(2012) 237-245

96.    S. Pramanik, N. Karak, S. Banerjee, A. Kumar, Effects of solvent interactions on the structure and property of prepared PAni nanofibers, J. Appl. Polym. Sci. 126 (2012) 830-836

97.    U. Konwar, T. Jana and N. Karak, Vegetable oil-based highly branched polyester modified epoxy based low VOC high solid industrial paint, J. Appl. Polym. Sci.125 (2012) E2–E9

98.    U. Konwar, N. Karak and M. Mandal, Vegetable oil based highly branched polyester/multi-walled carbon nanotubes nanocomposites as advanced materials, Adv. Sci. Lett. 16(2012)265-273

99.    G. Das and N. Karak, Epoxidized Mesua ferrea L. seed oil plasticized thermostable PVC and clay nanocomposites, J. Vinyl Additive Technol. 18(2012)168-177

100. H. Kalita and N. Karak, Bio-based elastomeric hyperbranched polyurethanes for shape memory application, Iran. Polym. J. 21(2012)263-271

101. B. Roy and N. Karak, Synthesis and characterization of thermostable hyperbranched epoxy resin for surface coating applications, J. Mater. Res. 7 (2012)1806-1814

102. B. Roy and N. Karak, Modification of hyperbranched epoxy by vegetable oil based highly branched polyester resin, Polym. Bull. 68 (2012) 2299-2312

103. H. Kalita and N. Karak, Mesua ferrea L. seed oil based hyperbranched shape memory polyurethanes: Effect of multifunctional component Polym. Eng. Sci. 52(2012) 2454–2461

104. S. Pramanik, K. Sagar, B. K. Konwar and N Karak, Synthesis, characterization and properties of a castor oil modified biodegradable poly(ester amide) resin, Prog. Org. Coat. 75(2012)569-578

105. R. Konwarh, S. Pramanik, K. S. P. Devi, N. Saikia, R. Boruah, T. K. Maiti, R. C. Deka and N. Karak, Lycopene coupled ‘trifoliate’ polyaniline nanofibers as multifunctional biomaterial, J. Mater. Chem. 22(2012)15062 - 15070

106. A. Gogoi, G. Das, N. Karak, A.J. Choudhury and G.A. Ahmed, Measurement of the light scattering properties of Bentonite clay particles embedded in transparent cylindrical polymer matrix, Atti Accad. Pelorit. Pericol. Cl. Sci. Fis. Mat. Nat. 89, C1V89S1P039, 1-5, 2011.

107. U. Konwar, M. Mandal and N. Karak, Mesua ferrea L. seed oil based acrylate-modified thermostable and biodegradable highly branched polyester resin/clay nanocomposites, Prog. Org. Coat. 72(2011) 676-685

108. R. Konwarh, B. Gogai, R. Philip, M.A. Laskar and N. Karak, Biomimetic preparation of polymer- supported free radical scavenging, cytocompatible and antimicrobial "green" silver nanoparticles using aqueous extract of Citrus sinensis peel, Colloids and Surfaces B: Biointerfaces  84 (2011) 338–345

109. U. Konwar and N. Karak,  Hyperbranched polyether core containing vegetable oil modified polyester and its clay nanocomposites, Polymer J. 43(2011)565–576

110. R. Konwarh, N. Karak, C. Ermine Sawian, S. Baruah and M. Mandal, Effect of sonication and aging on the templating attribute of starch for "green" silver nanoparticles and their interactions at bio-interface, Carbohydrate Polymers 83 (2011) 1245–1252

111. J. S. Borah, N. Karak and T. K. Chaki, Effect of organoclay platelets on morphology and properties of LLDPE/EMA blends, Mater. Sci. Eng. 528(2011)2820-2830

112. U. Konwar, G. Das and N. Karak, Mesua ferrea L. seed oil based highly branched polyester and epoxy blends and their nanocomposites, J. Appl. Polym. Sci. 121( 2011) 1076-1085

113. U. Konwar and N. Karak, Epoxy modified Mesua ferrea L. seed oil based polyester/clay nanocomposites, Int. J. Polym. Mater. 60(2011)799-816

114. H. Deka and N. Karak, Rheological study of vegetable oil based hyperbranched polyurethane/ multi-walled carbon nanotube nanocomposites, Polym.-Plastics Technol. Eng. 50(2011)797-803 

115. H. Deka and N. Karak, Bio-based hyperbranched polyurethane/clay nanocomposites: adhesive, mechanical, and thermal properties, Polym. Adv. Technol. 22(2011)973-980

116. U. Konwar, N. Karak and M. Mandal, Mesua ferrea L. seed oil based highly branched environment friendly polyester resin/clay nanocomposites, J. Polym. Environ. 91(2011) 90-99

117. S. Dutta, N. Karak and S. Baruah, Jute fiber reinforced MFLSO based polyurethane green composites. J. Appl. Polym. Sci. 115 (2010) 843-850

118. J. Borah, C. Wang and N. Karak, Synthesis and characterization of hyperbranched polyether. Chinese. J. Polym. Sci. 28 (2010) 107-118

119. N. Karak, R. Konwarh and B. Voit, Catalytically active vegetable-oil based thermoplastic hyperbranched polyurethane/silver nanocomposites. Macromol. Mater. Eng. 295 (2010) 159-169

120. H. Deka and N. Karak, Shape-memory property and characterization of epoxy resin modified Mesua ferrea L. seed oil based hyperbranched polyurethane. J. Appl. Polym. Sci. 116 (2010) 106-115

121. H. Deka, N. Karak, R.D. Kalita and A.K. Buragohain, Biocompatible hyperbranched polyurethane/multi-walled carbon nanotube composites as shape memory materials. Carbon 48 (2010) 2013-2022

122. U. Konwar, N. Karak and M. Mandal, Vegetable oil based highly branched polyester/clay silver nanocomposites as antimicrobial surface coating materials, Prog. Org. Coat. 68 (2010) 265-273

123. R. Konwarh, D. Kalita, C. Mahanta, M. Mandal and N. Karak, Magnetically recyclable, antimicrobial and catalytically enhanced polymer assisted ‘green’ nanosystem immobilized Aspergillus niger amyloglucosidase, Appl. Microb. Biotechnol. 87 (2010) 1983-1992

124. H. Deka, N. Karak, R.D. Kalita and A.K. Buragohain, Bio-based thermostable, biodegradable and biocompatible hyperbranched polyurethane/Ag nanocomposites with antimicrobial activity. Polym. Degrad. Stab. 95 (2010) 1509-1517

125. S. Dutta, N. Karak, J.P. Saikai and B. Konwar, Biodegradation of epoxy and MF modified polyurethane films derived from a sustainable resource, J. Polym. Environ. 18(2010)167-176

126. G. Das and N. Karak, Mesua ferrea L. seed oil-based epoxy resins, J. Appl. Polym. Sci. 118 (2010) 128-134

127. H. Deka and N. Karak, Influence of highly branched poly(amido amine) on the properties of hyperbranched polyurethane/ clay nanocomposites. Mater. Chem. Phys. 124 (2010)120-128

128. N. Karak, B. Roy and B. Voit, s-triazine based hyperbranched polyethers: synthesis, characterization and properties, J. Polym. Sci. Part A: Polym. Chem. 68 (2010) 3994-4004

129. G. Das and N. Karak, Thermostable and flame retardant Mesua ferrea L. seed oil based non-halogenated epoxy resin/clay nanocomposites, Prog. Org. Coat. 69(2010) 495-503

130. R. Konwarh, J.P. Saikai,  B. Konwar and N. Karak, Poly(ethylene glycol)-magnetic nanoparticles-curcumin' trio: directed morphogenesis and synergistic free radical scavenging, Colloids and Surfaces B: Biointerfaces 81 (2010) 578–586

131. S. S. Mahapatra and N. Karak, Fluorescent hyperbranched polyamine with s-triazine unit: synthesis, characterization and properties evaluation. Polymer J. 41 (2009)20-25

132. S. S. Mahapatra and N. Karak, Hyperbranched polyamine/Cu nanoparticles for Epoxy thermoset. J. Macromol. Sci. Part A: PAC. 46 (2009) 296-303

133. S. Dutta, N. Karak and T. Jana, Evaluation of Mesua ferrea L. seed oil modified polyurethane paints. Prog. Org. Coat. 65 (2009) 131–135

134. N. Karak, S. Rana and J.W. Cho, Synthesis and characterization of castor oil-modified hyperbranched polyurethanes. J. Appl. Polym. Sci. 112 (2009) 736-743

135. H. Deka and N. Karak, Vegetable oil based hyperbranched thermosetting polyurethane/clay nanocomposites. Nanoscale Res. Lett. 4 (2009)758-765

136. R. Konwarh, N. Karak, S.K. Rai and   A.K. Mukherjee, Polymer assisted iron oxide magnetic nanoparticle immobilized Keratinase. Nanotechnol. 20 (2009) 225107(pp10)

137. U. Konwar and N. Karak, Mesua ferrea L. seed oil-based highly branched polyester resins. Polym.-Plastics Technol. Eng. 48 (2009) 970-975

138. G. Deka, H. Deka and N. Karak, Free radical scavenging magnetic iron-based nanoparticles in hyperbranched and linear polymer matrices. J. Macromol. Polym. Sci.: PAC 46 (2009) 1128-1135

139. S. Dutta, N. Karak, Saikai J.P. and B. Konwar, Biocompatible epoxy modified bio-based polyurethane nanocomposites: mechanical property, cytotoxicity and biodegradation. Bioresour. Technol. 100 (2009) 6391-6397

140. H. Deka and N. Karak, Bio-based hyperbranched polyurethanes for surface coating applications. Prog. Org. Coat. 66 (2009) 192-198

141. G. Das and N. Karak, Vegetable oil-based flame retardant epoxy/clay nanocomposites. Polym. Degrad. Stab.  94 (2009) 1948-1954

142. G. Das and N. Karak, Epoxidized Mesua ferrea L. seed oil-based reactive diluent for BPA epoxy resin and their green nanocomposites. Prog. Org. Coat. 66 (2009) 59-64

143. U. Konwar, N. Karak and M. Mandal, Mesua ferrea L. seed oil-based highly thermostable and biodegradable polyester/clay nanocomposites. Polym. Degrad. Stab. 94 (2009) 2221-2230

144. S. S. Mahapatra, G. Das and N. Karak, Hyperbranched Polyamines as potential agents for epoxy resin. Paint India LXI (2009) 55-60

145. N. Kakati, S.S. Mahapatra and N. Karak, Silver nanoparticles in polyacrylamide and hyper-branched polyamine matrix. J. Macromol. Sci. Part A: PAC. 46 (2008) 658–663

146. S. S. Mahapatra, U. Das and N. Karak, Effect of structure and concentration of polymer, metal ion and pH of the medium on the fluorescence characteristics of hyperbranched polyamine. J. Luminescence 128 (2008) 1917-1921

147. S. S. Mahapatra and N. Karak, Silver nanoparticle in hyperbranched polyamine: synthesis, characterization and antibacterial activity. Mater. Chem. Phys. 112 (2008) 1114–1119

148. S. Rana, N. Karak, J.W. Cho and Y.H. Kim, Enhanced dispersion of carbon nanotubes in hyperbranched polyurethane and properties of nanocomposites. Nanotechnol. 19 (2008) 495707(pp8)

149. S. S. Mahapatra and N. Karak, Hyperbranched polyamine as multipurpose polymeric additives for LDPE and plasticized PVC. Euas. Chem. Technol. J.  9 (2007) 29-38

150. N. Dutta, N. Karak and S.K. Dolui, Stoving paint from Mesua  ferrea L. seed oil based short oil polyester and MF resins blend. Prog. Org. Coat. 58 (2007) 40-45

151. J. Borah and N. Karak, Blends of triazine based hyperbranched polyether with LDPE and plasticized PVC. J. Appl. Polym. Sci. 104 (2007) 648-654

152. S. Dutta and N. Karak, Blends of Mesua ferrea L. seed oil based polyurethane with epoxy resin. Pigment Resin Technol. 36 (2007) 74-82

153. S. S. Mahapatra and N. Karak, Hyperbranched aromatic polyamines with s-triazine rings. J. Appl. Polym. Sci. 106 (2007) 95-102

154. S. S. Mahapatra and N. Karak, s-Triazine containing flame retardant hyperbranched Polyamines: synthesis, characterization and properties evaluation. Polym. Degrd. Stab. 92 (2007) 947-955

155. S. S. Mahapatra and N. Karak, Hyperbranched polyamine: A promising curing agent for a vegetable oil based poly(ester-amide) resin. Prog. Org. Coat. 60 (2007) 328-334

156. N. Dutta, N. Karak and S.K. Dolui, Alkyd-epoxy blends as multipurpose coatings. J. Appl. Polym. Sci. 100 (2006) 516-521

157. S. Dutta and N. Karak, Effect of the NCO/OH ratio on the properties of Mesua ferrea L. seed oil-modified polyurethane resins. Polym. Int. 55 (2006) 49-56

158. N. Karak, Polymer (Epoxy) clay nanocomposites. J. Polym. Mater. 23 (2006) 1-20

159. N. Dutta, N. Karak and S.K. Dolui, High performance at low cost blending seed oil modified polyesters with MF resins for high quality Industrial coatings. Eur. Coat. J. 3 (2006) 42-47

160. J. Borah, S.S. Mahapatra, D. Saikia and N. Karak, Physical, thermal, dielectric and chemical properties of a hyperbranched polyether and its linear analog. Polym. Degrd. Stab. 91 (2006) 2911-2916

161. J. Borah and N. Karak, Synthesis and characterization of hyperbranched polyethersulfone as a flame retardant material. Int. J. Plastics Technol. 10 (2006) 598-604

162.     S. Dutta and N. Karak, Dielectric properties of epoxy modified Mesua ferrea l. seed oil based polyurethane films,  Materials Science-An Indian journal 2 (2006) 31-35

163.     S. Dutta, N. Karak and AMP Hussain, Melamine-formaldehyde modified Mesua ferrea linn polyurethane dielectric thin films, Materials Science-An Indian journal 2 (2006) 75-79

164.     N. Dutta, N. Karak and S.K. Dolui, Structural analysis, rheological behavior and the performance of the films for surface coatings’ applications of heated and unheated Nahar seed oil. Polym. Degrd. Stab. 88 (2005) 317-323

165.     S. Dutta and N. Karak, Synthesis, characterization of poly(urethane amide) resins from Nahar seed oil for surface coating applications. Prog. Org. Coat. 53 (2005) 147-152

166.     S. S. Mahapatra and N. Karak, Synthesis and characterization of aromatic polyethers containing s-triazine rings in the main chain. J. Polym. Mater. 22 (2005) 399-408

167.     S. Dutta and N. Karak, Mesua ferrea L seed oil based polyurethane and melamine-formaldehyde blends. Euas. Chem. Technol. J. 7 (2005) 251-260

168.     N. Dutta, N. Karak and S.K. Dolui, Synthesis and characterization of polyester resins based on Nahar seed oil. Prog. Org. Coat. 49 (2004) 146-152

169.     J. Borah and N. Karak, Synthesis and characterization of a novel hyperbranched polyether. Polym. Int.  53 (2004) 2026-2030

170.     S. S. Mahapatra and N. Karak, Synthesis and characterization of polyesteramide resins from Nahar seed oil for surface coating applications. Prog. Org. Coat. 51 (2004) 103-108

171.     N. Karak and S. Maiti, S. Das, and S.H. Dey, Antimony polymers part 5. Biological activity. J. Polym. Mater. 20 (2003) 237-242

172.     N. Karak and M. Roy, Effect of compounding ingredients on rheometric characteristics and physical properties of a rubber based shoe sole. J. Sci. Ind. Res. 62 (2003) 820-826

173.     N. Karak, J.S. Ko and J.B. Kim, Synthesis of a novel methacrylate, (1,4-dioxa-8-methacrylate amide spiro [4,5] decane) monomer and its copolymerization with t-butyl-3a-methacryloxy-7a, 12a- dihydroxy-5b cholan-24-oate for 193 nm photoresist. J. Polym. Mater. 19 (2002) 365-372

174.     N. Karak, Development of 157 nm photoresist polymers for F2 laser lithography. J. Sci. Ind. Res. 61 (2002) 571-585

175.     N. Karak and B.R. Gupta, Effects of different ingredients and cure parameters on physical properties of a tyre tread compound. Kautschuk Gummi Kunststoffe 53 (2000) 30-34

176.     N. Karak and B.R. Gupta, Effects of compounding ingredients of a tyre tread compound on physical properties, special reference to hardness. Ind. J. Chem. Technol. 7 (2000) 91-99

177.     N. Karak, Unique techniques for reclaiming of waste rubber products. Chemical  Weekly XLV (2000) 141-144

178.     N. Karak and S. Maiti, Antimony polymers, part 2. Physical, chemical and thermal properties. Die Angew. Makromol. Chem. 265 (1999) 5-12

179.     N. Karak, Control release fertilizer-an efficient fertilizer. J. Polym. Mater. 16 (1999) 309-320

180.     N. Karak and S. Maiti, Antimony Polymers. III. Flame retardant behavior of chloroprene and natural rubber vulcanizates with antimony polymer. J. Appl. Polym. Sci. 98 (1998) 927-935

181.     N. Karak, S. Maiti, S.R. Sanigrahi and R.N.P. Chowdhary, Antimony polymers (part 4) - Electrical properties of antimony polymers and blends. Ind. J. Chem. Technol. 5 (1998) 217-221

182.     N. Karak and S. Maiti, A novel method for synthesis of antimony containing polymers. J. Polym. Mater. 14 (1997) 71-78

183.     N. Karak and S. Maiti, Dendritic polymers: A class of novel materials. J. Polym. Mater. 14 (1997) 107-122

184.     N. Karak and S. Maiti, Antimony containing polymers. J. Polym. Mater. 13 (1996) 179-190

 

List of Book Publications

  1. N.Karak and S.Maiti, “Dendrimers and Hyperbranched Polymers – Synthesis to Applications”.  MD publication Pvt. Ltd., New Delhi, India, ISBN 978-81-7533-104-4 (2008).
  2. N. Karak,Fundamentals of Polymers-Raw Materials to Finish Products”. PHI Private Ltd., New Delhi, India, ISBN 978-81-203-3877-7 (2009).
  3. N. Karak, “Vegetable oil based polymers: Processing, Properties and Applications”, Woodhead Publishing House Limited, UK, ISBN 978-0-85709-710-1 (print), ISBN 978-0-85709-714-9 (online) (2012).
  4. F. Pacheco-Torgal, V. Ivanov, N. Karak and H. M. Jonkers (Eds.), “Biopolymers and Biotech Admixtures for Eco-efficient Construction Materials”, Woodhead Publishing House Limited, UK, ISBN :978-0-08100-214-8  (2016).
  5. N. Karak, Experimental Methods on Polymers, Nanomaterials and Their Nanocomposites”, Nova Science Publishers, USA, ISBN: 978-1-63484-358-4 (2016).

 

List of Chapters in Books

  1. N. Karak, H. Deka and S. Dutta, Vegetable oil based hyperbranched and conventional resinous polyurethane/ clay thermosetting nanocomposites, in  Proceeding of ICNM2009, Edited by Sabu Thomas and Poornima Vijayan, Applied Science Innovations Private Limited, India, ISBN : 978-81-906027-5-4 (2009)
  2. U. Konwar and N. Karak, Vegetable oil based conventional and hyperbranched polyester nanocomposites, in Developments in nanocomposites, Edited by  Kamal K Kar and Alma Hodzic, Research Publishing Services, Innovative Partners for Publishing Solutions, Singapore, ISBN 978-981-08-3711-2 (2011)
  3. J. Borah and N. Karak, ‘Dendrimers and hyperbranched polymers- A new dimension of polymer sciences, in Advanced materials: A book series, Edited by Ashutosh Tiwari and Mustafa M. Demir, Wiley-Scrivener Publishing, LLC, USA, Chapter 12, pp. 399-441, ISBN: 978-1-118-77348-2 (2014)
  4. N. Karak, Bio-based hyperbranched polyurethane nanocomposites, in Encyclopedia of Polymer Science and Technology, John Wiley & Sons, Inc., Hoboken, USA, (2015) DOI: 10.1002/0471440264.pst638
  5. N. Karak, Biopolymers for paints and coatings, in Biopolymers and Biotech Admixtures for Eco-efficient Construction Materials, Edited by F. Pacheco-Torgal, V. Ivanov, N. Karak and H. M. Jonkers, Elsevier Limited, (2016).
  6. N. Karak, Bio-based hyperbranched polyurethanes and their nanocomposites as shape memory materials, in Encyclopedia of Nanoscience and Nanotechnology, Edited by H. S. Nalwa, American Scientific Publisher, (2016, in press).
  7. S. Pramanik and N. Karak, Polymer nanocomposites for adhesive, coating and paint applications, in Properties and Applications of Polymer Nanocomposites: Clay and Carbon Based Polymer Nanocomposites, Edited by D. K. Tripathy, A. K. Barick, and B. P. Sahoo, Springer  (2016, in press).

 

List of Patents

1.      N. Karak and B. Be, A TOUGH SYNTHETIC LOW DIELECTRIC HYPERBRANCHED EPOXY THERMOSET AND A PROCESS FOR PREPARING THEREOF, Indian Patent (application No. 786/KOL/2013 of 28.06.2013)(complete specification filled on 19.02.2014).

 

2.      N. Karak, S. Barua and P. Chattopadhyay, A SYNTHETIC HYPERBRANCHED EPOXY SURGICAL SEALANT AND A PROCESS FOR PREPARATION THEREOF, Indian Patent (application No. 211/KOL/2014 of 19.02.2014)(complete specification filled on 15.02.2014)