Blar i NTNU Open på forfatter "Kristiansen, Helge"
-
A novel Characterization Method for electric Properties of single Silver-coated Polymer Spheres
Stokkeland, August Emil Tobiesen (Master thesis, 2015)The electrical properties of isotropic conductive adhesives (ICAs) are dependent on the filler concentration and electrical properties of the conductive additives. ICAs with metal-coated polymer spheres (MPS) are an efficient ... -
Atomistic scale thermal transport in metal and polymer
Seljevold, Sandra Sæther (Doctoral theses at NTNU;2024:276, Doctoral thesis, 2024)The never-ending need for faster, more complex devices has started a trend of miniaturization that has dominated the electronic industry since the 60s. This trend has led to the characteristic dimensions of components going ... -
CONDUCTION MECHANISMS IN CONDUCTIVE ADHESIVES WITH METAL-COATED POLYMER SPHERES
Pettersen, Sigurd Rolland (Doctoral theses at NTNU;2016:349, Doctoral thesis, 2016)Isotropic conductive adhesives (ICAs), i.e. polymer adhesives with a percolating network of filler particles embedded for conductivity, have been used as alternatives to soldering in electronic devices for decades. More ... -
Contact area measurement of micron-sized metal-coated polymer particles under compression
Bazilchuk, Molly Strimbeck; Sumigawa, Takashi; Kitamura, Takayuki; Zhang, Zhiliang; Kristiansen, Helge; He, Jianying (Journal article; Peer reviewed, 2019)The contact problem of a sphere under compression by a rigid plate is pertinent to understanding electrical contact formation in anisotropic conductive adhesive (ACA) applications. However, no work has experimentally ... -
Contact Resistance and Metallurgical Connections Between Silver Coated Polymer Particles in Isotropic Conductive Adhesives
Pettersen, Sigurd Rolland; Kristiansen, Helge; Nagao, Shijo; Helland, Susanne; njagi, john; Suganuma, Katsuaki; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2016)Recently, there has been an increasing interest in silver thin film coated polymer spheres as conductive fillers in isotropic conductive adhesives (ICAs). Such ICAs yield resistivities similar to conventional silver flake ... -
Controlling the Conduction Mechanisms in Isotropic Conductive Adhesives with Silver-Coated Polymer Spheres
Pettersen, Sigurd Rolland; Kristiansen, Helge; Redford, Keith; Helland, Susanne; Kalland, Erik; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2016)Replacing the silver flakes in conventional isotropic conductive adhesives (ICAs) with micron sized polymer spheres coated with tens to hundreds nanometer of silver (AgPS) drastically reduces the silver content required ... -
Crosslinking effect on the deformation and fracture of monodisperse polystyrene-co-divinylbenzene particles
He, Jianying; Zhang, Zhiliang; Kristiansen, Helge; Redford, Keith; Fonnum, Geir; Modahl, Grete (Journal article; Peer reviewed, 2013)This study focuses on the effect of crosslinking density on the mechanical response of polystyrene-co-divinylbenzene (PS-DVB) particles under compression by means of nanoindentation-based flat punch method combined with ... -
Deformation and fracture of micron-sized metal-coated polymer spheres: an in situ study
Bazilchuk, Molly Strimbeck; Sumigawa, Takashi; Kitamura, Takayuki; Zhang, Zhiliang; Kristiansen, Helge; He, Jianying (Journal article; Peer reviewed, 2018)In situ imaging and analysis of the mechanical behavior of micron‐sized metal‐coated polymer particles under compression is reported. A nanoindentation set‐up mounted in a scanning electron microscope is used to observe ... -
Electrical characterization of individual metal-coated polymer spheres used in isotropic conductive adhesives
Nguyen, Hoang-Vu; He, Jianying; Helland, Tore; Kristiansen, Helge; Aasmundtveit, Knut Eilif (Journal article; Peer reviewed, 2016)Isotropic conductive adhesives (ICAs) filled with metal-coated polymer spheres (MPS) have been proposed to improve the mechanical reliability compared to conventional ICAs filled with silver flakes. The electrical properties ... -
Electrical four-point probing of spherical metallic thin films coated onto micron sized polymer particles
Pettersen, Sigurd Rolland; Stokkeland, August Emil; Kristiansen, Helge; njagi, john; Redford, Keith; Goia, Dan; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2016)Micron-sized metal-coated polymer spheres are frequently used as filler particles in conductive composites for electronic interconnects. However, the intrinsic electrical resistivity of the spherical thin films has not ... -
Electromechanical characterization of individual micron-sized metal coated polymer particles
Bazilchuk, Molly Strimbeck; Pettersen, Sigurd Rolland; Kristiansen, Helge; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2016)Micron-sized polymer particles with nanoscale metal coatings are essential in conductive adhesives for electronics assembly. The particles function in a compressed state in the adhesives. The link between mechanical ... -
ELECTROMECHANICAL CHARACTERIZATION OF METALCOATED POLYMER SPHERES FOR CONDUCTIVE ADHESIVES
Bazilchuk, Molly Strimbeck (Doctoral theses at NTNU;2018:295, Doctoral thesis, 2018)Micron-sized metal-coated polymer sphere(s) (MPS) are a critical component in anisotropic conductive adhesive (ACA) applied in fine pitch electrical interconnect. The MPS are compressed during adhesive bonding, so their ... -
Enhancement of Thermal Boundary Conductance of Metal–Polymer System
Sandell, Susanne; Maire, Jeremie; Chavez-Angel, Emigdio; Sotomayor Torres, Clivia M.; Kristiansen, Helge; Zhang, Zhiliang; He, Jianying (Peer reviewed; Journal article, 2020)In organic electronics, thermal management is a challenge, as most organic materials conduct heat poorly. As these devices become smaller, thermal transport is increasingly limited by organic–inorganic interfaces, for ... -
Investigation of thermal transport in polymer composites with percolating networks of silver thin films by the flash diffusivity method
Pettersen, Sigurd Rolland; Nagao, Shijo; Kristiansen, Helge; Helland, Susanne; Njagi, John; Suganuma, Katsuaki; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2017)The flash diffusivity method, also known as laser flash analysis (LFA), is commonly used to obtain the thermal diffusivity (α) and thermal conductivity (κ) of materials, due to its relative simplicity, rapid measurements, ... -
Loading rate effects on the fracture of Ni/Au nano-coated acrylic particles
He, Jianying; Nagao, Shijo; Kristiansen, Helge; Zhang, Zhiliang (Journal article; Peer reviewed, 2012)Mechanical failure of monodisperse Ni/Au coated acrylic particles has been investigated by individual compression tests using nanoindentation-based technique equipped with a flat diamond punch. We have found that both ... -
Resistance Analysis of Spherical Metal Thin Films Combining Van Der Pauw and Electromechanical Nanoindentation Methods
Bazilchuk, Molly Strimbeck; Evenstad, Otto Magnus; Zhang, Zhiliang; Kristiansen, Helge; He, Jianying (Journal article; Peer reviewed, 2018)Although micron-sized metal-coated polymer particles are an important conductive filler material in anisotropic conductive adhesives, the resistance of the particles in adhesive is not well understood. In this study, a van ... -
Room-Temperature Curing and Grain Growth at High Humidity in Conductive Adhesives with Ultra-Low Silver Content
Pettersen, Sigurd Rolland; Redford, Keith; njagi, john; Kristiansen, Helge; Helland, Susanne; Kalland, Erik; Goia, Dan; Zhang, Zhiliang; He, Jianying (Journal article; Peer reviewed, 2017)Isotropic conductive adhesives (ICAs) are alternatives to metallic solders as interconnects in solar modules and electronic devices, but normally require silver contents >25 vol.% and elevated curing temperatures to achieve ... -
Size dependent behaviour of micron-sized composite polymer particles
He, Jianying; Zhang, Zhiliang; Kristiansen, Helge (Journal article; Peer reviewed, 2010)The mechanical properties of micron-sized composite polymer particles have been investigated by using a nanoindentation-based flat punch technique. The contact loaddisplacement relationship of particles has been established ... -
Size-dependent mechanical behavior of nanoscale polymer particles through coarse-grained molecular dynamics simulation
Zhao, Junhua; Nagao, Shijo; Odegard, Gregory; Zhang, Zhiliang; Kristiansen, Helge; He, Jianying (Journal article; Peer reviewed, 2013)Anisotropic conductive adhesives (ACAs) are promising materials used for producing ultra-thin liquid-crystal displays. Because the mechanical response of polymer particles can have a significant impact in the performance ... -
Surface Wrinkling with Memory for Programming Adhesion and Wettability
Wang, Feng; Xiao, Senbo; Luo, Sihai; Fu, Yuequn; Skallerud, Bjørn Helge; Kristiansen, Helge; cui, mengkui; zhong, chao; Liu, Siqi; Zhuo, Yizhi; He, Jianying; Zhang, Zhiliang (Peer reviewed; Journal article, 2023)Modulating surface wrinkling is important for a variety of engineering applications. It has been known for more than two decades that the wavelength of surface wrinkles occurring in a metal film–soft polymer system scales ...