Uniformly-sized, single-crystal alpha-quartz nanospheres have been synthesized at 200 °C and 15 atm under continuous stirring starting from uniform, amorphous Stöber silica colloids and using NaCl and alkali hydroxide as mineralizers. Quartz nanosphere size is controlled by the colloid particle size via direct devitrification. Uniform, high-purity nanocrystalline quartz is important for underst...

1 Institute of Electrochemistry and Energy Sources, Bulgarian Academy of Sciences, Sofia, Bulgaria 2 Department of Machine Elements and Chemistry, Faculty of Transport Management, Todor Kableshkov University of Transport, Sofia, Bulgaria 3 Department of Inorganic Chemistry and Chemical Education, Faculty of Natural Sciences, Shumen University “Konstantin Preslavski”, Shumen, Bulgaria 4 Middlese...

A biotinylated sialylglycan was prepared enzymatically by endo-M, and binding behavior of an SSA lectin was studied on a different coverage of a sialylglycan-immobilized 27 MHz quartz-crystal microbalance (QCM).

A biosensor is a device for the detection of an analyte that combines a biological component with a physicochemical detector component. It consists of many parts such as the Sensitive Biological Element, the Probe and Electronics. Biosensor has many advantages such as minimum sample pretreatment, fast response time, simple and low-cost instrumentation and high sample output. Biosensor is benefi...

The mass sensitivity of quartz-crystal microbalance (QCM) was drastically improved by removing electrodes and wires attached on the quartz surfaces. Instead of wire connections, intended vibrations of quartz oscillators were excited and detected by antennas through electromagnetic waves. This noncontacting measurement is the key for ultrahigh-sensitive detection of proteins in liquids as well a...

A microstructural investigation of stishovite-bearing quartzite from the Vredefort meteorite impact site in South Africa reveals features that are attributed to shock deformation. These include abundant mechanically induced Dauphiné twinning, rhombohedral deformation lamellae and associated residual stresses. Mechanical twins were identified with SEM-EBSD. Residual stresses are derived from equ...