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  1. No Access

    Article

    Activation of neem flower with CTAB for irreversible adsorption of methyl orange—isotherm, kinetics, and thermodynamics studies

    The novel cationic cetyltrimethylammonium bromide (CTAB)-modified neem flower was prepared and studied to assess its adsorptive potential of methyl orange dye from the contaminated aqueous medium. The chemica...

    Pola Jeevan Kumar, P. S. Raghavan, S. Induja… in Biomass Conversion and Biorefinery (2023)

  2. Article

    Open Access

    Large unexplained suite of chemically reactive compounds present in ambient air due to biomass fires

    Biomass fires impact global atmospheric chemistry. The reactive compounds emitted and formed due to biomass fires drive ozone and organic aerosol formation, affecting both air quality and climate. Direct hydro...

    V. Kumar, B. P. Chandra, V. Sinha in Scientific Reports (2018)

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  3. No Access

    Article

    Experimental and Theoretical Study of the Mechanoluminescence of ZnS:Mn Nanoparticles

    We report the synthesis and mechanoluminescence (ML) of manganese-doped zinc sulfide (ZnS) nanoparticles. Clusters of ZnS:Mn nanocrystals were prepared by chemical precipitation, by mixing of solutions of zinc...

    Ravi Sharma, D. P. BiSen, B. P. Chandra in Journal of Electronic Materials (2015)

  4. No Access

    Article

    Synthesis and Optical Properties of CaMgSi2O6:Ce3+ Phosphors

    CaMgSi2O6:Ce3+ phosphors were prepared by the solid state reaction method at a temperature of 1050°C. Structural and morphological studies of the phosphors were carried out using x-ray diffraction (XRD) and scann...

    Priya Chandrakar, D. P. Bisen, R. N. Baghel… in Journal of Electronic Materials (2015)

  5. No Access

    Article

    Luminescent properties of Dy3+ - doped CaMgSi2O6 phosphor

    Photoluminescence (PL), mechanoluminescence (ML) and thermoluminescence (TL) studies of Dy3+-doped CaMgSi2O6 phosphor are reported in the present paper. The sample of CaMgSi2O6:Dy3+ was prepared by using a solid-...

    P. Chandrakar, R. N. Baghel, D. P. Bisen… in Journal of the Korean Physical Society (2015)

  6. No Access

    Article

    Temperature dependence of pulse-induced mechanoluminescence excitation in coloured alkali halide crystals

    In practice, the relative efficiencies of different crystals are often determined under identical conditions of temperature and excitation. If the temperature of a crystal is increased or decreased with respec...

    Namita Rajput, S. Tiwari, B. P. Chandra in Bulletin of Materials Science (2004)

  7. No Access

    Article

    Characteristics of a.c. electroluminescence in thin film ZnS : Mn display devices

    Thin film electroluminescence (TFEL) displays are complex optoelectronic devices with challenging material requirement. The electrical characteristics of ZnS : Mn alternating current thin film electroluminesce...

    Sanjay Tiwari, Shikha Tiwari, B. P. Chandra in Journal of Materials Science: Materials in… (2004)

  8. No Access

    Article

    Dislocation unpinning model of acoustic emission from alkali halide crystals

    The present paper reports the dislocation unpinning model of acoustic emission (AE) from alkali halide crystals. Equations are derived for the strain dependence of the transient AE pulse rate, peak value of th...

    B. P. Chandra, Anubha S. Gour, Vivek K. Chandra, Yuvraj Patil in Pramana (2004)

  9. No Access

    Article

    Photoplastic effect in polycarbonate using microhardness measurements

    Vickers microhardness indentation technique has been employed to detect the photoplastic effect in the transparent polycarbonate specimens in darkness and under mercury illumination. For low applied loads, the...

    R. Bajpai, Sandhya Sharma, V. K. Vastal, B. P. Chandra in Bulletin of Materials Science (2003)

  10. No Access

    Article

    Characteristics of the fast electron emission produced during the cleavage of crystals

    The present paper reports the fast electron emission produced during the cleavage of alkali halide crystals and models the dynamics of the process. The mechano-emission arises as a result of the ionization of ...

    B. P. Chandra, N. L. Patel, S. S. Rahangdale, R. P. Patel, V. K. Patle in Pramana (2003)

  11. No Access

    Article

    Correlation between deformation bleaching and mechanoluminescence in coloured alkali halide crystals

    The present paper reports the correlation between deformation bleaching of coloration and mechanoluminescence (ML) in coloured alkali halide crystals. When the F-centre electrons captured by moving dislocations a...

    B P Chandra, M Ramrakhiani, P Sahu, A M Rastogi in Pramana (2000)

  12. No Access

    Chapter

    Mechanoluminescence

    Mechanoluminescence (ML) is a type of luminescence induced during any mechanical action on solids. It can be excited by grinding, rubbing, cutting, cleaving, shaking, scratching, compressing, or crushing of so...

    B. P. Chandra in Luminescence of Solids (1998)

  13. No Access

    Article

    Field emission theory of dislocation-sensitized photo-stimulated exo-electron emission from coloured alkali halide crystals

    A new field emission theory of dislocation-sensitized photo-stimulated exo-electron emission (DSPEE) is proposed, which shows that the increase in the intensity of photo emission fromF-centres during plastic defo...

    B P Chandra, R S Chandok, P K Khare in Pramana (1997)

  14. No Access

    Article

    Mobile interstitial model and mobile electron model of mechano-induced luminescence in coloured alkali halide crystals

    A theoretical study is made on the mobile interstitial and mobile electron models of mechano-induced luminescence in coloured alkali halide crystals. Equations derived indicate that the mechanoluminescence int...

    B P Chandra, Seema Singh, Bharti Ojha, R G Shrivastava in Pramana (1996)

  15. No Access

    Article

    Preparation and characterization of gold doped (Zn, Cd)S mixed phosphors for mechano-optical transducers

    When mechanically excited, initially the ML intensity increases, attains a maximum value and then decreases with time. The total ML intensityI T initially increases with the impact velocityV ...

    Sanjay Tiwari, Shikha Tiwari, B K Sahu, B P Chandra in Bulletin of Materials Science (1995)

  16. No Access

    Article

    Photoluminescence of gold-doped (Zn, Cd)S mixed phosphors

    (Zn, Cd)S: Au, Cl mixed phosphors were prepared in nitrogen atmosphere with various concentrations of impurities. Photoluminescence (PL) spectra were obtained. The peak of the PL spectrum shifts towards longer...

    Sanjay Tiwari, Shikha Mishra, B P Chandra in Bulletin of Materials Science (1994)

  17. No Access

    Article

    Influence of surface treatments on CdSe thin films in photoelectro-chemical solar energy conversion

    Photovoltaic performance of semiconductor-liquid junction solar cell using electro-codeposited thin filmn-CdSe is found to improve significantly by proper surface treatments. The solid state parameters of anneale...

    Shikha Mishra, Sanjay Tiwari, B. P. Chandra in Bulletin of Materials Science (1994)

  18. No Access

    Article

    A search for mechanoluminophors capable of pressure-induced thermal population of excited states

    During the process of deforming a crystal, a high pressure is developed near the tip of mobile cracks, which may in turn produce a new ground state by thermal electron transfer. Upon sudden release of pressure...

    B P Chandra, Meera Ramrakhiani, M H Ansari, S Tiwari in Pramana (1991)

  19. No Access

    Article

    Tetrahedral manganese (II) complexes—intense and unique type of mechanoluminophores

    Intense and unique type of mechanoluminescence (ML) is found in tetrahedral manganese (II) complexes. During the excitation of ML by the impact of a piston onto the crystal, the ML intensity initially increase...

    B P Chandra, M S K Khokhar, R S Gupta, B Majumdar in Pramana (1987)

  20. No Access

    Article

    Mechanoluminescence excitation in alkali halide crystals and colouration decay in microcrystalline powders

    The mechanoluminescence (ML) of NaCl, NaBr, NaF, LiCl and LiF crystals ceases at 105, 58, 170, 151 and 175°C respectively. Both the temperatureT c at whichML di...

    B P Chandra, R D Verma, M S K Khokhar, S V Moharil, K K Batra, B T Deshmukh in Pramana (1985)

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