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Sonochemically assisted synthesis of nano HMX

Defence Technology（防务技术） 2019年第6期15卷 837-843页

作者： Hema Singh Nilesh Jahagirdar shaibal banerjee Department of Applied Chemistry Defence Institute of Advanced Technology (DU)

Nanotechnology has played an influential role in improving the energetic content without subsiding the performance of high energy materials in the current *** this work,HMX(octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine)nanoparticles were prepared by sonochemically assisted solvent-antisolvent spray technique focussing the reduction in its size so as to improve its energetic *** order to fabricate nano HMX various parameters such as different solvents and temperature were *** is one of the strategies recently explored in this regard;so time dependent study of sonication using probe sonicator was *** has been postulated that bubble formed during sonication when collapses generate high temperature and many nucleation sites which leads to the formation of uniform spherical particles with small size and fast transition *** studies depicted phase transformation from a toβas a result of *** TEM images revealed that the rise in the sonication time resulted into decrease in the particle size from 300 to 10 *** scanning calorimetry(DSC)was employed to determine the heat release of the samples and enhancement in the heat release with the decrease in the particle size.A decrease in the spark sensitivity was observed from 2 J(regular HMX)to 50 mJ(nano HMX).

关键词： Sonication Spray technique Nano HMX Probe sonicator Impact sensitivity

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Preparation of reduced sensitivity co-crystals of cyclic nitramines using spray flash evaporation

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Defence Technology（防务技术） 2020年第1期16卷 188-200页

作者： Mrinal Ghosh AKSikder shaibal banerjee MBTalawar NSikder High Energy Materials Research Laboratory Pune 411021India Defence Institute of Advanced Technology Pune 411025India

The present day weapon technology demands novel energetic materials that exhibit simultaneous high explosive yield and reduced *** article demonstrates application of spray evaporation to prepare reduced sensitive co-crystals of high performance nitramine explosives like HMX and CL-20 with a relatively less insensitive explosive 1,1-diamino-2,2-dinitroethylene or *** intermolecurar hydrogen bonding in FOX-7 is responsible for limited solubility in nost of o rganic *** solubility differences of FOX-7 with HMX and CL-20 restricts ifs co-crystallization through classical methods that yields thermodynamically favorable *** flash evaporation,a kinetic crystallization method,has been therefore adopted and could successfully produce CL-20/FOX-7(2:1) and HMX/FQX-7(4:1) *** fine powdered materials obtained were characterized by SEM,powder XRD,Raman spectro scopy,DSC-TGA *** Raman spectra showed consistent occurrence of spectral features indicating stoichiometric co-existence of ingredients in the crystal *** analysis showed absence of all thermally assisted solidsolid phase transformation in the co-crystals as they were observed in pristine *** thermal stability calculated in terms of activation barrier fordecomposition,revealed the CL-20/FOX-7 co-crystal to be interlediately stable on comparison to their constituents while,the HMX/FOX-7 co-crystal is more *** to pure HMX and CL-20,both the co-crystals have shown higher insensitivity to impact force,suggesting them to be suitable for future generation insensitive munitions.

关键词： Cyclic nitramine Solubility Spray evaporation Co-crystal Reduced sensitivity

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Light weight HTPB-clay nanocomposites (HCN) with enhanced ablation performance as inhibition materials for composite propellant

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Defence Technology（防务技术） 2021年第2期17卷 559-570页

作者： Kavita Ghosh L.V.Gaikwad R.K.Kalal P.A.Kulkarni Arvind Kumar shaibal banerjee Manoj Gupta High Energy Materials Research Laboratory SutarwadiPune411021India Defence Institute of Advanced Technology GirinagarPune411025India

In the present study,organically modified Montmorillonite clay with polar moiety,the Cloisite 30B,is used for preparation of Hydroxyl terminated polybutadiene(HTPB)-clay nanocomposites(HCN)by dispersion of nanoclay in polymer matrix under high shear *** nanocomposites thus prepared are evaluated in composite propellants as inhibitor material for their functional *** inhibition formulations containing 5 wt%-15 wt%of nanoclay,with or without the conventional filler Sb2O3,were *** these formulations were evaluated for their physical,mechanical,thermal,and ablative *** rate and density of the compositions containing Cloisite 30B is around 23%and 5%lower respectively in comparison of the base *** capability of these compositions is twofold higher than that of base *** compositions have also been evaluated for their smoke generation tendency by measuring infra red(IR)attenuation in the wavelength range 1.3 mm e5.6 mm and 8 mme13 mm and thereby compared with the base *** corresponding results confirmed that the compositions containing Cloisite 30B as filler have much lower IR attenuation than compositions with conventional filler,*** of 5%Sb2O3 by nanoclay showed 8%reduction in IR attenuation rate which further reduced to 16%on replacement of 15%of *** bonding of HCN based inhibitors is also comparable or even better than conventional ***,the nanoclay composites with Cloisite 30B as filler exhibit all desirable properties of an inhibitor.

关键词： Nanocomposite Inhibitor Composite propellant Ablation

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Measurement and comparison of gas holdup in Rushtontank at higher impeller speeds and larger gas fluxes with γ-CT

Measurement and comparison of gas holdup in Rushtontank at h...

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第三届全国化学工程与生物化工年会

作者： shaibal Roy Rajneesh Varma CREL Department of Chemical Engineering Washington University in St．LouisMOUSA63130 CREL Department of Chemical Engineering Washington University in St．LouisMOUSA63130

＜正＞Three gas dispersion states in liquid in a standard Rushton stirred tank（20cm i.d.）-cup dispersion, critical dispersion and full dispersion were observed in experiments for air-water system. Only those gas dispersion states over the critical dispersion were of significations both in laboratory researches and in industrial applications. However this situation couldn’t be distinguished in the flow map regime established on gas-filled cavity structures usually used to judge gas dispersion states in liquid in Rushton stirred tank. The distributions of gas holdups at 3/4 dimensionless static liquid height of tank

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Accidental Entry of Foreign Body in Maxillary Sinus—A Case Report

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Open Journal of Stomatology 2015年第1期5卷 1-5页

作者： Nishant Kumar Himanshu Bhutani Pushpak Jain Abhishek Verma Sps Tomar shaibal Chaterjee Ankur Garg Rohit Awana Department of Oral and Maxillofacial Surgery ITS Dental College Hospital and Research Centre Greater Noida India

Extraction of the first molar or premolar is the commonest cause of oro-antral fistula. Management involves identification of the same, removal of any foreign body from the maxillary sinus, if present, followed by appropriate flap for closer. A case is presented when a gutta percha (GP) point was accidentally dislodged into the right maxillary sinus during preliminary diagnosis of the oro-antral fistula. The surgical management of the case is described and is the appropriate treatment plan.

关键词： Gutta Percha Maxillary Sinus Caldwell-Luc Approach Buccal Pad of Fat

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