Hmila I; Hill J; Shalaby K; Ouararhni K; Abedsselem H; Modaresi SMS; Bihaqi SW; Marques E; Sondhi A; Slitt AL. Perinatal exposure to PFOS and sustained high-fat diet promote neurodevelopmental disorders via genomic reprogramming of pathways associated with neuromotor development. Elsevier. Ecotoxicology and Environmental Safety. Feb 2024.

A Physical Properties Measurement System (PPMS) is a stateof-the-art laboratory instrument used to investigate the physical behavior of materials under different external conditions. PPMS is based on the principles of experimental physics and thermodynamics, which govern the behavior of matter under various physical conditions. The system typically consists of a cryogenic cooling system, a magnetometer, a temperature controller, a sample holder, and various sensors and instruments for measuring different physical properties.

Scanning Electron Microscopy (SEM) provides high-resolution and long-depth-of-field images of the sample surface and nearsurface using an energetic beam of electrons. As an e-beam rasters specimen surface, various signals that contain information about the surface topography and composition are produced as a result of the beam–material interaction. Sketch provides different signals produced as a result of this interaction.

The Gatan Precision Etching and Coating System II utilizes two (2) penning ion guns to etch and to coat an SEM sample in one evacuation. Ion etching the surface of a sample is done in cases when traditional grinding and polishing may not be sufficient or may adversely cause undesired reactions due to a specific sample’s chemistry. For metallography, ion etching is a viable and inert alternative to wet chemical etching, which is done to reveal grain microstructure.

Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) is an analytical technique used to study the chemical composition and molecular structure of the surfaces of materials at the nanoscale. It has become an essential tool in the fields of materials science, surface chemistry, and biomedicine, among others. In this technique, a primary ion beam is used to sputter secondary ions from the surface of the sample. These ions are then mass-analyzed based on their time of flight to a detector, providing information on their mass-to-charge ratio and abundance.

The microhardness tester makes an indent using a specialized indenter and holding for a set period. The user then measures the diagonals of the indents, and the tester automatically calculates the hardness. The testing parameters, such as the type of indenter, force and holding time, can be changed by users to match their requirements.

Thermogravimetric analysis (TGA) is a technique used to measure changes in sample weight as a function of temperature or time. This technique is valuable because even small changes in a sample's weight can provide a wealth of information about its chemical and physical properties. The sensitivity and quality of the balance used in TGA allows for precise measurements of even small changes in sample weight, enabling researchers to gain insight into various phenomena that affect the sample, such as vaporization, sublimation, absorption, adsorption, and desorption.

X-ray Photoelectron Spectroscopy (XPS) is an analytical technique that provides information on the chemical composition, elemental distribution, and chemical bonding state of the surface of a material. It is based on the photoelectric effect, which is a fundamental principle in quantum mechanics that explains the interaction between photons and matter. When a photon of sufficient energy is absorbed by an atom in a material, an electron is ejected from that atom, resulting in the emission of a photoelectron.

Planetary ball milling is a technique for reducing and homogenizing the average particle size of powder samples. This can also be used for mixing different powder samples into a homogenous mixture. This technique is mainly used for preparing samples for powder XRD and XRF. Our laboratory houses two (2) variant models of Retsch planetary ball mills, only differing in the number of ball jars, the volumetric capacity of each ball jar and maximum rotational speed. Both models are capable of storing 10 custom SOP’s, direction reversal and interval operation.

A Hall Effect Measurement System (HEMS) is a powerful scientific instrument used to measure the electrical properties of materials. It uses the Hall Effect, a physical phenomenon discovered by Edwin Hall in 1879, to measure the voltage generated when a current flows through a material placed in a magnetic field. The HEMS system typically consists of a sample holder, a magnet, a current source, and a voltmeter.