Search results for: Murali Sastry

Items from 1 to 20 out of 112 results

article

Room temperature synthesis of porous gold nanostructures by controlled transmetallation reaction via chicken egg shell membrane

Manjunatha Pattabi, M Krishnaprabha, Rajesha Nairy K, Murali Sastry

Materials Chemistry and Physics > 2017 > 202 > C > 22-30

The formation of porous gold nanostructures in aqueous medium at room temperature using transmetallation reaction (TM reaction) that involves sacrificial silver nanoparticles and Au³⁺ ions (HAuCl₄) controlled using a naturally available chicken egg shell membrane is reported in this article. The formation of porous gold nanostructures via TM reaction is inferred from UV-Vis absorption spectra. Crystallinity...

chapter

Electrostatic assembly of nanoparticles

Murali Sastry

Nanostructure Science and Technology > Nanoparticles > 225-250

There is much excitement in the study of nanoscale matter with respect to their fundamental properties, organization to form superstructures and applications. The unusual physicochemical and optoelectronic properties of nanoparticles are primarily due to confinement of electrons within particles of dimensions smaller than the bulk electron delocalization length, this process being termed quantum confinement...

article

Controlling the assembly of hydrophobized gold nanoparticles at the air–water interface by varying the interfacial tension

Shweta Gupta, Nahar Singh, Murali Sastry, Rita Kakkar, more

Thin Solid Films > 2010 > 519 > 3 > 1072-1077

Controlled assembly is the key to harness the nanoscale properties of nanoparticles in most technological applications and it has been an important challenge as it leads to the manipulation of interparticle properties. The present work depicts the control of the assembly of nanoparticles in the monolayers by evaporation kinetics and particle interactions at the air–liquid interface. In the presence...

article

Halide ion controlled shape dependent gold nanoparticle synthesis with tryptophan as reducing agent: Enhanced fluorescent properties and white light emission

Manasi Kasture, Murali Sastry, B.L.V. Prasad

Chemical Physics Letters > 2010 > 484 > 4-6 > 271-275

We report the synthesis of Au nanoparticles in presence of two surfactants cetyltrimethyl ammonium chloride (CTAC) and cetyltrimethyl ammonium bromide (CTAB) by reducing Au ³⁺ ions with tryptophan. Interestingly, triangular shaped particles were seen to form in presence of CTAB, while spherical nanoparticles resulted with CTAC. The highlight of this result is the white light emission from...

article

Shape and size selective separation of gold nanoclusters by competitive complexation with octadecylamine monolayers at the air–water interface

Renu Pasricha, Amit Singh, Murali Sastry

Journal of Colloid And Interface Science > 2009 > 333 > 1 > 380-388

The paper presents a time-dependent study of shape-dependent preferential complexation of gold nanoparticles to the octadecyl amine (ODA) monolayers at the air–water interface. Room temperature reduction of chloroaurate ions using lemon grass leaf extract yields a mixture of spherical and triangular nanoparticles, which were used for this study. These nanoparticles have a net negative charge on their...

article

Preparation of Nearly Monodisperse Nickel Nanoparticles by a Facile Solution Based Methodology and Their Ordered Assemblies

Deepti S. Sidhaye, Tanushree Bala, S. Srinath, H. Srikanth, more

The Journal of Physical Chemistry C > 2009 > 113 > 9 > 3426 - 3429

article

Bacteria-Mediated Precursor-Dependent Biosynthesis of Superparamagnetic Iron Oxide and Iron Sulfide Nanoparticles

Atul A. Bharde, Rasesh Y. Parikh, Maria Baidakova, Samuel Jouen, more

Langmuir > 2008 > 24 > 11 > 5787 - 5794

article

New approach towards imaging λ-DNA using scanning tunneling microscopy/spectroscopy (STM/STS)

Shirshendu Dey, Sushama Pethkar, Suguna D. Adyanthaya, Murali Sastry, more

Bulletin of Materials Science > 2008 > 31 > 3 > 309-312

A new methodology to anchor λ-DNA to silanized n-Si(111) surface using Langmuir Blodget trough was developed. The n-Si (111) was silanized by treating it with low molecular weight octyltrichlorosilane in toluene. Scanning tunneling microscopy (STM) image of λ-DNA on octyltrichlorosilane deposited Si substrate shows areas exhibiting arrayed structures of 700 nm length and 40 nm spacing. Scanning tunneling...

article

Interfacial deposition of Ag on Au seeds leading to AucoreAgshell in organic media

S. Prathap Chandran, J. Ghatak, P.V. Satyam, Murali Sastry

Journal of Colloid And Interface Science > 2007 > 312 > 2 > 498-505

A seed mediated procedure for the synthesis of hydrophobic Au _core Ag _shell nanoparticles in toluene is demonstrated. The reaction proceeds by way of the interfacial reduction of silver ions by 3-pentadecylphenol followed by their deposition on hydrophobized Au nanoparticles. Such a hitherto unreported interfacial seeded growth reaction leads to the formation of phase pure Au _core...

article

Synthesis of triangular Au core–Ag shell nanoparticles

Akhilesh Rai, Minakshi Chaudhary, Absar Ahmad, Suresh Bhargava, more

Materials Research Bulletin > 2007 > 42 > 7 > 1212-1220

In this paper, we demonstrate a simple and reproducible method for the synthesis of triangular Au core–Ag shell nanoparticles. The triangular gold core is obtained by the reduction of gold ions by lemongrass extract. Utilizing the negative charge on the gold nanotriangles, silver ions are bound to their surface and thereafter reduced by ascorbic acid under alkaline conditions. The thickness of the...

article

Interaction of Different Metal Ions with Carboxylic Acid Group: A Quantitative Study

Tanushree Bala, B. L. V. Prasad, Murali Sastry, Mousumi Upadhyay Kahaly, more

The Journal of Physical Chemistry A > 2007 > 111 > 28 > 6183 - 6190

article

Zirconia Enrichment in Zircon Sand by Selective Fungus-Mediated Bioleaching of Silica

Vipul Bansal, Asad Syed, Suresh K. Bhargava, Absar Ahmad, more

Langmuir > 2007 > 23 > 9 > 4993 - 4998

article

Scanning tunneling microscopy/spectroscopy on Au nanoparticles assembled using lauryl amine (LAM) and octadecane thiol (ODT)

Suwarna Datar, Minakshi Chaudhari, Murali Sastry, C.V. Dharmadhikari

Applied Surface Science > 2007 > 253 > 11 > 5109-5115

In this report, we demonstrate scanning tunneling microscopy and spectroscopy on thin films of lauryl amine (LAM) and octadecane thiol (ODT) protected gold nanoparticles. We show that the zero current in the I–V curves (measure of Coulomb blockade (CB) of the nanoparticles) depends on the properties of the spacer molecule. In both the cases the gap voltage and the tunneling current at which the images...

article

Chitosan Reduced Gold Nanoparticles as Novel Carriers for Transmucosal Delivery of Insulin

Devika R. Bhumkar, Hrushikesh M. Joshi, Murali Sastry, Varsha B. Pokharkar

Pharmaceutical Research > 2007 > 24 > 8 > 1415-1426

Purpose Colloidal metallic systems have been recently investigated in the area of nanomedicine. Gold nanoparticles have found themselves useful for diagnostic and drug delivery applications. Herein we have reported a novel method for synthesis of gold nanoparticles using a natural, biocompatible and biodegradable polymer; chitosan. Use of chitosan serves dual purpose by acting as a reducing agent...

article

Fungus-Mediated Biotransformation of Amorphous Silica in Rice Husk to Nanocrystalline Silica

Vipul Bansal, Absar Ahmad, Murali Sastry

Journal of the American Chemical Society > 2006 > 128 > 43 > 14059 - 14066

article

Room-Temperature Biosynthesis of Ferroelectric Barium Titanate Nanoparticles

Vipul Bansal, Pankaj Poddar, Absar Ahmad, Murali Sastry

Journal of the American Chemical Society > 2006 > 128 > 36 > 11958 - 11963

article

Role of Halide Ions and Temperature on the Morphology of Biologically Synthesized Gold Nanotriangles

Akhilesh Rai, Amit Singh, Absar Ahmad, Murali Sastry

Langmuir > 2006 > 22 > 2 > 736 - 741

article

Gold Nanoparticles as Carriers for Efficient Transmucosal Insulin Delivery

Hrushikesh M. Joshi, Devika R. Bhumkar, Kalpana Joshi, Varsha Pokharkar, more

Langmuir > 2006 > 22 > 1 > 300 - 305

article

Cobalt and Magnesium Ferrite Nanoparticles: Preparation Using Liquid Foams as Templates and Their Magnetic Characteristics

Tanushree Bala, C. Raj Sankar, Marina Baidakova, Vladimir Osipov, more

Langmuir > 2005 > 21 > 23 > 10638 - 10643

article

Biocompatibility of Gold Nanoparticles and Their Endocytotic Fate Inside the Cellular Compartment: A Microscopic Overview

Ravi Shukla, Vipul Bansal, Minakshi Chaudhary, Atanu Basu, more

Langmuir > 2005 > 21 > 23 > 10644 - 10654

Publication date

Set your own date range

Content availability

Available (111)
None (1)

Publication type

article (111)
book (1)

INFONA - science communication portal

Search results for: Murali Sastry

Room temperature synthesis of porous gold nanostructures by controlled transmetallation reaction via chicken egg shell membrane

Electrostatic assembly of nanoparticles

Controlling the assembly of hydrophobized gold nanoparticles at the air–water interface by varying the interfacial tension

Halide ion controlled shape dependent gold nanoparticle synthesis with tryptophan as reducing agent: Enhanced fluorescent properties and white light emission

Shape and size selective separation of gold nanoclusters by competitive complexation with octadecylamine monolayers at the air–water interface

Preparation of Nearly Monodisperse Nickel Nanoparticles by a Facile Solution Based Methodology and Their Ordered Assemblies

Bacteria-Mediated Precursor-Dependent Biosynthesis of Superparamagnetic Iron Oxide and Iron Sulfide Nanoparticles

New approach towards imaging λ-DNA using scanning tunneling microscopy/spectroscopy (STM/STS)

Interfacial deposition of Ag on Au seeds leading to AucoreAgshell in organic media

Synthesis of triangular Au core–Ag shell nanoparticles

Interaction of Different Metal Ions with Carboxylic Acid Group: A Quantitative Study

Zirconia Enrichment in Zircon Sand by Selective Fungus-Mediated Bioleaching of Silica

Scanning tunneling microscopy/spectroscopy on Au nanoparticles assembled using lauryl amine (LAM) and octadecane thiol (ODT)

Chitosan Reduced Gold Nanoparticles as Novel Carriers for Transmucosal Delivery of Insulin

Fungus-Mediated Biotransformation of Amorphous Silica in Rice Husk to Nanocrystalline Silica

Room-Temperature Biosynthesis of Ferroelectric Barium Titanate Nanoparticles

Role of Halide Ions and Temperature on the Morphology of Biologically Synthesized Gold Nanotriangles

Gold Nanoparticles as Carriers for Efficient Transmucosal Insulin Delivery

Cobalt and Magnesium Ferrite Nanoparticles: Preparation Using Liquid Foams as Templates and Their Magnetic Characteristics

Biocompatibility of Gold Nanoparticles and Their Endocytotic Fate Inside the Cellular Compartment: A Microscopic Overview

Filter options

Publication date

Content availability

Publication type

Publication language

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Murali Sastry

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Publication language

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options