Search query: semiconductor package special release agent

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abstract: Provided are: a mold release film which exhibits excellent antistatic effect even in a high temperature environment, while having excellent transparency; and a method for manufacturing a semiconductor package, which uses this mold release film. A mold release film which is arranged on a mold surface that comes into contact with a curable resin during the production of a semiconductor package, wherein a semiconductor element is arranged within a mold and sealed with the curable resin, thereby forming a resin sealed part. This mold release film comprises: a mold releasing base 2 that comes into contact with the curable resin during the formation of the resin sealed part (said base containing no antistatic agent) and an antistatic layer 3 that comes into contact with the mold during the formation of the resin sealed part. The antistatic layer 3 contains at least one antistatic agent selected from the group consisting of conductive polymers and conductive metal oxides. This mold release film has a total light transmittance of 80% or more.
author_names: Li Jing She

Ling Mu Zheng Ji
title: Mold release film and method for manufacturing semiconductor package
year: 2015

abstract: Boron Nitride (BN) is used in various applications such as in lubrication, as a releasing agent and also as a thermosetting insulator material and thermal enhancer because of its advanced material properties. Electrophoretic deposition (EPD) method is a new method for semiconductor industries and it has grown in the interest on making use of BN as a thermal interface material and electrical isolation in Transistor Outline (TO) packages. Hexagonal Boron Nitride (h BN) stability in EPD suspension is essential to produce repeatability and reproducibility in the result of the deposition. However, h BN particle has less functional group on its side wall to create bonding with the polymer matrix. In order to increase functional groups on its side wall, NaOH surface treatment which has been established by other researchers was performed. The purpose of this study is to prepare and characterise of the h BN particles in EPD suspension using different types of suspension mediums and binders. The particle size characterization and Field Emission Scanning Electron Microscopy (FESEM) on the as received h BN particle indicates that particle sizes were less than 1 mm but are in agglomerated forms in the De ionized (DI) water suspension. Sedimentation test method of h BN particles in four dispersion media (deionized water, Acetic acid solution, Sulphamic Acid Ammonia) and using different binder (Polyethylene Glycol (PEG) Silane Coupling Agent, Polycationic 1 (PC 1) Polycationic 2 (PC 2) The result showed a combination of deionized water and PC 2 produced the highest stability for h BN dispersion. Sedimentation test and zeta potential method were used to determine the optimum concentration of PC 2 addition in a h BN suspension. EPD of h BN was performed on TO package using different levels of PC 2 concentration (i.e. 0.2 1.0 wt% Characterization of the EPD coating were performed in terms of thickness, microstructure analysis on surface and micrograph from FESEM, and surface roughness. The optimum concentration of PC 2 in order to achieve the highest h BN stability was in the range of 0.3 0.4 wt% with a corresponding deposition thickness of 8 mm. The obtained thickness was the highest among other samples, and had surface roughness of 570 nm. Critical factors that affected the deposition for h BN EPD process were suspension ionic conductivity and excess PC 2 concentration. High conductivity and excess PC 2 concentration caused electric double layer of h BN particles to be compressed thus resulting in a low deposition yield. Therefore, it is recommended that future works use ultra pure DI water and excess binder of h BN suspension need to be removed by centrifugal washing before undergoes EPD to reduce conductivity of h BN suspension. Besides it also helps to achieve a high deposition thickness of h BN for thermal conductive and electrical isolation application.
author_names: Jayaganasan Narayanasami
title: Preparation Characterization Of Electrophoretically Deposited BN Film For Semiconductor Package
year: 2017

abstract: A preparation method of a special efficient sustained release cold storage agent for supporting fruit and vegetable storage and transportation comprises steps as follows: three raw materials including cyclodextrin, glycerine and sodium polyacrylate are prepared in percentage by weight; under the condition of the room temperature, cyclodextrin is added to water and is stirred until cyclodextrin is sufficiently dissolved to obtain a transparent liquid, and then glycerine is slowly added and stirred until glycerine is sufficiently dissolved; sodium polyacrylate is finally added and stirred until polyacrylate is sufficiently dissolved to obtain a colloidal liquid, and the cold storage agent is obtained; the prepared cold storage agent is packaged. The cold storage agent prepared with the method is non toxic, odorless, safe and environment friendly, has a remarkable refrigeration effect, can be recycled, cannot shrink, and cannot produce deionized water; the preparation process does not require heating, and the operation method is simple and feasible; the sustained release cold storage agent can be recycled, has low cost and good effect, is applicable to large scale production and facilitates popularization.
title: Preparation method of special efficient sustained release cold storage agent for supporting fruit and vegetable storage and transportation
year: 2015

abstract: Back grinding process, to provide a composite function tape for semiconductor package capable of performing a dicing step and a pickup step and the die attach process simultaneously. In particular, the interface between the adhesive layer and the second adhesive layer, by placing the first adhesive layer which is cured with adhesive layer during UV irradiation include a UV curing agent, improved release characteristics of the composite function tape adhesive layer it can be. The semiconductor package multifunction tape according to the present invention, ultraviolet curable adhesive layer formed on one surface of the base film, a first adhesive layer and second adhesive layer formed on the ultraviolet curable pressure sensitive layer provided. .The
author_names: soku son,kiyu

bomu chiyun,chiyan

hiyun chiyo,zie

ha huwan,yon
title: The method of manufacturing a semiconductor device using the multifunction tape and this semiconductor package
year: 2009

abstract: The academic exploration and technology design of active packaging are coherently supplying innovative approaches for enhancing the quality and safety of food, as well as prolonging their shelf life. With the object of comparison between two barrier materials, such as stable petrochemical polyurethane (PU) (BASF) and biodegradable natural poly(3 hydroxybutyrate) (PHB) (Biomer Co. Krailling, Germany) the study of antibacterial agent release has been performed. For the characterization of polymer surface morphology and crystallinity, the scanning electron microscopy (SEM) atomic force microscopy (AFM) and differential scanning calorimetry (DSC) were used respectively. The antimicrobial activity of chlorhexidine digluconate (CHD) has been estimated by the Bauer Kirby Disk Diffusion Test. It was shown that the kinetic release profiles of CHD, as the active agent, in both polymers, significantly differed due to the superposition of diffusion and surface degradation in poly(3 hydroxybutyrate) (PHB) To emphasize the special transport phenomena in polymer packaging, the diffusivity modeling was performed and the CHD diffusion coefficients for the plane films of PU and PHB were further compared. The benefit of active biodegradable packaging on the base of PHB is discussed.
author_names: Alexey L Iordanskii

A L Zhulkina

Anatoliy Olkhov

Sergey V Fomin

Andrey Burkov

Mikhail Stilman
title: Characterization and Evaluation of Controlled Antimicrobial Release from Petrochemical (PU) and Biodegradable (PHB) Packaging
venue: Polymers
year: 2018

abstract: BACKGROUND Recently, antimicrobial photodynamic therapy (aPDT) as an alternative treatment modality has been used adjunctively in the treatment of periodontitis and peri implantitis. Photosensitizing agents in the form of nanoparticles are designed for improving the efficiency of aPTD. Graphene quantum dots are a special type of tiny nanocrystals that can promote aPDT when coupled with curcumin (Cur) The main objective of the present study was to investigate the effects of photoexcited GQD Cur on the metabolic activity of perio pathogen mixed biofilms. MATERIALS AND METHODS GQD Cur was synthesized and characterized by scanning electron microscopy (SEM) dynamic light scattering (DLS) fourier transform infrared (FTIR) spectroscopy, ultraviolet visible spectrometry (UV Vis) and X ray diffraction (XRD) The cell cytotoxicity effect of GQD Cur was evaluated on primary human gingival fibroblast (HuGu) cells. Perio pathogen mixed biofilms including Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and Prevotella intermedia photosensitized with GQD doped with Cur were irradiated with a blue LED at a wavelength of 435 20 nm for 1 min, and then bacterial viability measurements were performed. The antimicrobial susceptibility profile, biofilm formation ability, amount of reactive oxygen species (ROS) released, and variations of gene expressions involved in biofilm formation were assessed. RESULTS The SEM, DLS, FTIR, UV Vis spectrometry, and XRD pattern confirmed that GQD Cur was synthesized successfully. According to the results, GQD Cur exhibited no cytotoxicity against HuGu cells. Photoexcited GQD Cur resulted in a significant reduction in cell viability (93% and biofilm formation capacity (76% of peri pathogens compared to the control group (P 0.05) According to the results, a significant concentration dependent increase in the ROS generation was observed in perio pathogens mixed cells treated with different doses of GQD Cur aPDT. Moreover, rcpA, fimA, and inpA gene expression profiles were downregulated by 8.1 9.6 and 11.8 folds, respectively. CONCLUSIONS Based on the results, photoexcited GQD Cur with a high potency of perio pathogens suppression in planktonic and biofilm forms and downregulation of the biofilm genes expression pattern was exploited as a nanoscale based platform for periodontitis.
author_names: Maryam Pourhajibagher

Steven J Parker

Nasim Chiniforush

Abbas Bahador
title: Photoexcitation triggering via semiconductor graphene quantum dots by photochemical doping with curcumin versus perio pathogens mixed biofilms.
venue: Photodiagnosis and photodynamic therapy
year: 2019

abstract: Aroma compounds are known to be efficient active agents for a broad range of applications (antimicrobial, anti oxidant, insect repellent. that are highly sought when aiming at extending shelf life of food or biological products. However, they are intrinsically odorant and volatile at ambient temperature, which restricts the processing routes used to introduce them in a polymeric matrix and can affect their mode of action and limit efficiency. Indeed, due to their high sensitivity toward temperature they can be lost or transformed during processing. Acting after being released in the headspace, their concentration has to be controlled to avoid any odorant contamination of the targeted products. Hence, the ability for an aroma compound to be retained in a polymeric matrix, and then released when submitted to a triggering effect, are the two main requirements that should be satisfied. The volatile nature of the aroma compound offer the possibility when introduce in the packaging to act by direct or indirect contact with the product and thus to be used in different ways; as a coating layer directly applied on the product surface, as a self supported film or as coated paper when associated with a paper sheet, as well as an object that could be inserted in the package. As biopolymers such as proteins and polysaccharides are able to retain aroma compounds but also to favor their release by modification of their structure when the relative humidity (RH) and temperature change, they are relevant carriers of these specific aroma compounds. Examples of how active packaging systems with limonene, eugenol and carvacrol as active agents were designed and elaborated. These examples will be presented with a special focus on the processing conditions and the way to improve their aroma compound retention and the release control (biopolymer nature, cyclodextrin clay addition. Avrami's equation has been used to model the transfer of aroma compound and to advantageously compare it taking into account the mechanism in relation to the biopolymer structural changes.
author_names: Jose Daniel Wicochea-Rodriguez

Pascale Chalier

Thierry Ruiz

Emmanuelle Gastaldi
title: Active Food Packaging Based on Biopolymers and Aroma Compounds: How to Design and Control the Release
venue: Front. Chem.
year: 2019

abstract: We have recently implemented a new version of the quasiparticle self consistent GW (QSGW) method in the ecalj package released at this http URL. Since the new version of the ecalj is numerically stable and accurate compared to the previous versions, we can perform calculations easily without being bothered with setting input parameters. Here we examine its ability to describe energy band properties, e.g. band gap energy, eigenvalues at special points and effective mass, for variety of semiconductors and insulators. We treat C, Si, Ge, Sn, SiC (in 2H, 3C, and 4H structures) (Al, Ga, N)x(N, P, As, Pb) (Zn, Cd, Mg)x(O, S, Se, Te) SiO2, HfO2, ZrO2, SrTiO3, PbS, PbTe, MnO, NiO, and HgO. We propose that a hybrid QSGW method, where we mix 80 percent of QSGW and 20 percent of LDA, gives universally good agreement with experiments for these materials.
author_names: Daiki Deguchi

Kazunori Sato

Hiori Kino

Takao Kotani
title: Accurate energy bands calculated by the hybrid quasiparticle self consistent GW method implemented in the ecalj package
year: 2015

abstract: In order to deliver a bioactive agent to a physiological location, it is important to be able to regulate precisely the location and the dosage. Such exquisite control can easily be envisioned for a photochemical drug that is active toward release of the desired bioactive agent upon irradiation of a specific tissue site. These materials should be thermally stable but reactive under excitation at visible (vis) or near infrared (NIR) wavelengths where tissue transmission is optimal. Two photon excitation (TPE) is of special interest, since the use of focused laser pulses to activate release could provide 3D spatial control in therapeutic applications. This Account describes the preparation and photochemistry of a series of transition metal complexes designed to release the simple bioregulatory compound nitric oxide upon vis or NIR excitation. In order to enhance the light gathering capability of such compounds, we have attached chromophores with high single or two photon absorption cross sections to several photochemical NO precursors. For example, the iron nitrosyl clusters Fe2(mu SR)2(NO)4 (Roussin's red esters) have been prepared with various chromophores as pendant groups, an example being the protoporphyrin XI derivative illustrated here. Direct excitation into the vis absorbing Q bands of the porphyrin leads to enhanced rates of NO generation from the Fe/S/NO cluster owing to the larger rate of light absorption by that antenna. Furthermore, femtosecond pulsed laser NIR excitation of the same compound at 810 nm (a spectral region where no absorption bands are apparent) leads to weak emission at approximately 630 nm and generation of NO, both effects providing evidence of a TPE mechanism. Roussin's red esters with other chromophores described here are even more effective for TPE stimulated NO release. Another photochemical NO precursor discussed is the Cr(III) complex trans Cr(L)(ONO)2( where L is a cyclic tetraamine such as cyclam. When L includes a chromophore tethered to the ligand backbone, excitation of that functionality results in energy transfer to the spin forbidden ligand field double states and light stimulated release of NO. We are working to develop systems where L is attached to a semiconductor nanoparticle as the antenna. In this context, we have shown that electrostatic assemblies are formed between the anionic surface of water soluble CdSe/ZnS core/shell quantum dots (QDs) and Cr(L)(ONO)2( cations via an ion pairing mechanism. Photoexcition of such modified QDs leads to markedly enhanced NO generation and suggests promising applications of such nanomaterials as photochemical drugs.
author_names: Peter C Ford
title: Polychromophoric metal complexes for generating the bioregulatory agent nitric oxide by single and two photon excitation.
venue: Accounts of chemical research
year: 2008

abstract: The dynamics of nuclear envelope has a critical role in multiple cellular processes. However, little is known regarding the structural changes occurring inside the nucleus or at the inner and outer nuclear membranes. For viruses assembling inside the nucleus, remodeling of the intranuclear membrane plays an important role in the process of virion assembly. Here, we monitored the changes associated with viral infection in the case of nudiviruses. Our data revealed dramatic membrane remodeling inside the nuclear compartment during infection with Oryctes rhinoceros nudivirus, an important biocontrol agent against coconut rhinoceros beetle, a devastating pest for coconut and oil palm trees. Based on these findings, we propose a model for nudivirus assembly in which nuclear packaging occurs in fully enveloped virions. ABSTRACT Enveloped viruses hijack cellular membranes in order to provide the necessary material for virion assembly. In particular, viruses that replicate and assemble inside the nucleus have developed special approaches to modify the nuclear landscape for their advantage. We used electron microscopy to investigate cellular changes occurring during nudivirus infection and we characterized a unique mechanism for assembly, packaging, and transport of new virions across the nuclear membrane and through the cytoplasm. Our three dimensional reconstructions describe the complex remodeling of the nuclear membrane necessary to release vesicle associated viruses into the cytoplasm. This is the first report of nuclear morphological reconfigurations that occur during nudiviral infection. IMPORTANCE The dynamics of nuclear envelope has a critical role in multiple cellular processes. However, little is known regarding the structural changes occurring inside the nucleus or at the inner and outer nuclear membranes. For viruses assembling inside the nucleus, remodeling of the intranuclear membrane plays an important role in the process of virion assembly. Here, we monitored the changes associated with viral infection in the case of nudiviruses. Our data revealed dramatic membrane remodeling inside the nuclear compartment during infection with Oryctes rhinoceros nudivirus, an important biocontrol agent against coconut rhinoceros beetle, a devastating pest for coconut and oil palm trees. Based on these findings, we propose a model for nudivirus assembly in which nuclear packaging occurs in fully enveloped virions.
author_names: Sailakshmi Velamoor

Allan Mitchell

Bruno M Humbel

Won-mo Kim

Charlotte Pushparajan

Gabriel A Visnovsky

Laura N Burga

Mihnea Bostina
title: Visualizing Nudivirus Assembly and Egress
venue: mBio
year: 2020