01499nas a2200241   4500008004100000022001400041245010300055210006900158260005700227300001200284490000700296520062200303653000800925653003100933653003400964653001700998100002001015700002101035700002701056700001901083700002601102856012901128       2008                        eng d  a0250-470700aNew approach towards imaging lambda-DNA using scanning tunneling microscopy/spectroscopy (STM/STS)0 aNew approach towards imaging lambdaDNA using scanning tunneling   a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN  a309-3120 v313 a<p>A new methodology to anchor A-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 lambda-DNA on octyltrichlorosilane deposited Si substrate shows areas exhibiting arrayed structures of 700 nm length and 40 nm spacing. Scanning tunneling spectroscopy (STS) at different stages depict a broad distribution of defect states in the bandgap region of n-Si(111) which presumably facilitates tunneling through otherwise insulating DNA layer.</p>10aDNA10aLangmuir Blodget technique10aScanning tunneling microscopy10asilanization1 aDey, Shirshendu1 aPethkar, Sushama1 aAdyanthaya, Suguna, D.1 aSastry, Murali1 aDharmadhikari, C., V.  uhttps://library.ncl.res.in/content/new-approach-towards-imaging-lambda-dna-using-scanning-tunneling-microscopyspectroscopy-001800nas a2200217   4500008004100000022001400041245012000055210006900175260009500244300001200339490000800351520092000359653002501279653001701304653002101321653002401342100002301366700002901389700003801418856012601456       2008                        eng d  a0021-979700aTuning the hydrophobic properties of silica particles by surface silanization using mixed self-assembled monolayers0 aTuning the hydrophobic properties of silica particles by surface  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcFEB  a372-3790 v3183 a<p>Here we describe a novel method of preparing hydrophobic silica particles (100-150 nm; water contact angle of dropcasted film ranging from 60 degrees to 168 degrees) by surface functionalization using different alkyltrichlorosilanes. During their preparation, the molecular surface roughness is also concurrently engineered facilitating a change in both the surface chemical composition and the geometrical microstructure to generate hierarchical structures. The water contact angle has been measured on drop-cast film surface. The enhancement in the water contact angle on 3D (curved) SAMs in comparison to that on 2D (planar) surface is discussed using the Cassie-Baxter equation. These silica particles can be utilized for many potential applications including selective adsorbents and catalysts, chromatographic supports and separators in microfluidic devices. (C) 2007 Elsevier Inc. All rights reserved.</p>10aalkyltrichlorosilane10asilanization10asilica particles10asuperhydrophobicity1 aKulkami, Sneha, A.1 aOgale, Satishchandra, B.1 aVijayamohanan, Kunjukrishanan, P.  uhttps://library.ncl.res.in/content/tuning-hydrophobic-properties-silica-particles-surface-silanization-using-mixed-self-0