Kulim Kht for functional nanoparticle deposition

Voltammetric sensors based on LB films

The use of quick, reliable and cheap sensors for the detection of chemical compounds represents an important need in the food industry. Antioxidants, in particular phenols, are among the analytes that must be monitored and measured in order to guarantee the quality of final products. Previous works have demonstrated that voltammetric electrodes chemically modified with electrocatalytic materials can be successfully used as sensors for the detection of antioxidants. Electrodes can be prepared using a variety of techniques from simple Carbon Paste Electrodes (CPE) or Screen printed Electrodes (SPE) to extremely sophisticated nanostructured sensors prepared using the Langmuir-Blodgett (LB) or the electrostatic Layer-by-Layer (LbL) techniques. Nanostructured sensors have the advantage of the enhanced number of active sites producing an increase in the intensity. In this webinar we will get introduced to the field of voltammetric sensors based on LB films and especially LB films with functionalized nanoparticles. The excellent sensing properties of these sensors could be attributed to the electrocatalytic properties of the nanoparticles combined with the high surface to volume ratio and homogeneity provided by the LB technique used for the immobilization. Moreover, the LB technique also provided an accurate method to immobilize the gold nanoparticles giving rise to stable and reproducible sensors. Read more

Kulim Kht bionavis SPR.... Polymer collapse

 Polymer collapse due to pH or electric potential change monitored with MP-SPR

Conductive polymers (CP) are utilized in drug delivery systems, microelectronics, photonics and also for material in biomedical engineering. CP polymer poly (3,4-ethylenedioxythiophene) (PEDOT) was deposited on a sensor slide and above that Poly (acrylic acid) (PAA) brush which is a promising biointerface material.

Multi-Parametric Surface Plasmon resonance (MP-SPR) was utilized to follow PAA polymer brushes swelling and collapse caused by pH or electric potential change. MP-SPR with electrochemical cell was utilized to form potential change to the conductive sensor surface. Multi wavelength MP-SPR measures whole SPR curve with two different wavelength and this can be utilized to calculate deposited layer thickness (more detailed see AN#128).

On a sensor slide had 18 nm thick PBrEDOT layer and 15 nm thick PAA layer on top of that. BrEDOT-g-PAA revealed to be pH sensitive as expected. In acidic environment (pH4) PAA polymer brushes collapsed resulting a decrease in thickness of the layer and an increase in refractive index of brushes. Electric potential change seemed to cause PAA brushes conformational collapse also in basic environment due to conductive polymer oxidation.

Kulim Kht BioNavis Multi-Parametric -Surface Plasmon Resonance

Kulim Kht Interfacial Tension in Enhanced Oil Recovery

Enhanced Water-Oil Separation 

nhanced Water-Oil Separation 

Scenario: In an offshore oil production platform, the production stream includes a significant amount of water, which forms an emulsion with the crude oil due to high surface tension. Application: By lowering surface tension using appropriate surfactants, contact angle and surface energy measurements can guide the selection of the most effective chemicals. This optimization improves emulsion destabilization, allowing for more efficient water-oil separation and reduced energy consumption during processing. 

Kulim Kht CO2 in Enhanced Oil Recovery

Enhanced Oil Recovery 

Introduction

Oil reservoirs are high temperature and pressure environments
that consist of porous rocks, oil, and various gases. Typically, after
the primary and secondary oil recovery processes, at least 50% of
the original oil still remains in the reservoir [1]. As the exploration
of new oil reservoirs is decreasing because of environmental
factors, there is a growing need to process the existing oil
reservoirs more efficiently.
One method for recovering additional oil, termed tertiary or
enhanced oil recovery, involves injecting carbon dioxide (CO2) into
the reservoir, to displace and dissolve more of the remaining oil.
This process can lead to an additional 8-16% recovery after the
primary and secondary recovery steps [1]. The interfacial tension
between hydrocarbons, water, and CO2 play an important role in
determining the effectiveness of the CO2-enhanced oil recovery



Kulim Kht Batch sessile measurement mode

1. Batch sessile measurement mode   
•Totally new measurement mode – aimed for QC!
•Can be performed with Theta and Theta Lite Extended
All Theta configurations are ok from manual to automatic ones
•Will give you the contact angle value on specified time points
Case: “I need to get the contact angle from 3 second time and 10 second time, 5 points per each sample, 1000 samples”
 Previously extremely time consuming especially for analysis, now optimized to show only the desired results in a simple table!